数控车床自动回转刀架英文文献以及翻译
车床介绍外文资料翻译中英文对照
外文资料Lathe is introduced The lathe is mainly for the car round face and boring, car and so on a work and design of machine tools. Turning rarely in itsHe kinds of machine tools, and any other machine tools are not like lathe so easily turning processing. Because of the lathe can also be used to drilling and reaming, lathe versatility can make workpiece finish a few in a installationKind of processing. Therefore, in the production of various kinds of lathes use than any other kinds of machine tools.The basic parts are: lathe bed, spindle box components, the tailstock components, slip board components, screw and light poles.Bed is lathe based pieces. It can often is by after a full normalizing or aging treatment of ductile iron of grey or into. It is a strong rigid frame, all the other basic components are installed on the bed. Usually in bed body have inside.The two set of parallel guide. Some manufacturers are using to all four guide pointed toward the triangle on rails guide namelyYamagata prefecture, and some factory guide in a group or is in both groups are using a triangle guide and a rectangleGuide. Guide to machined to guarantee their straightness precision. In order to resist wear and scratches, most modernThe guide is through the surface machine hardening, but during operation should also be careful to avoid damage guide. Guide railAny error, often means the whole machine precision damaged.Spindle boxinstalled in the fixed position medial guide, usually left end of the bed. It provides power, and can make the workPieces of speed in turn. It basically consists of a installed in the hollow shaft and precision bearing a series of variable speed teethWheel similar to the truck gearbox together. Through the sliding gears, spindle can swim in the many kinds of rotating speed. mostlyCount lathe have 8 to 12 kinds of speed, general form. According to arrange series But in the modern machine just pull 2 ~ 4 handlesSo they can get all the speed. A growing trend is through the electrical or mechanical device withoutVariable.Due to the accuracy of machine tool depends largely on spindle, therefore, spindle structure size is larger, usually installedAfter the preloaded the heavy tapered roller bearings or ball bearings. Axis in a full-length through-hole throughout bar feeders, longThrough the hole by feeding. The size of the Lord when an important dimension is lathe, so when the work-piece must be when the principalThe materials, it confirms that can process the imum size of the blank bar feeders.The tailstock component mainly consists of three parts. The inside of the motherboard and lathe bed rails, can be in guide with the longitudinallyMobile. Floor has a can make whole the tailstock component clamping device at any position. The tailstock body installed in the endBoard, along some type of key slot in floor lateral movement, make the tailstock can and spindle box to the spindle is.The tailstock third part is the tailstock sleeve. It is a diameter usuallyat about 51 ~ 76mm 2 ~ 3 inchesThe steel hollow cylinder between. Through the handwheel and screw, the tailstock sleeve can in the tailstock body and move in a few longitudinal moveAn inch.The lathe with two dimensions specifications said. The first called lathe bed surface the largest machining diameter. This is in the latheCan the biggest diameter workpiece rotate. It is about two top attachment and guide rail of the distance of the nearest point two times. The second size is the imum distance between the two top. Lathe bed surface the largest machining diameter said on a latheThe biggest workpiece to turning diameter and the imum distance between the two top, said two top can be installed in betweenThe imum length of workpiece.Ordinary lathe is in the production of the most frequently used lathes type. They have all those front parts of SyracuseHeavy machine, and outside, all except for small knife tool sport has motor feed. They are usually the specifications: lathe bed face biggest process diameter for 305 ~ 610mm 12 to 24 inches; But, the bed surface the largest machining diameterAchieve 1270mm 50 inches and the distance between the two top 3658mm lathe to is not uncommon also. These carsBed most have scraps plate and a installed in internal cooling fluid circulation system. Small plain lathe bed face -- latheThe largest machining diameter usually less than 330mm 13 inches - is designed, and its bench-type lathe bed installation at workStations or on the cabinet.Although there are many USES, ordinary lathe is very useful, butthe machine tool and replacement and adjust to measure the work piece flowersFee much time, so they are not suitable for mass production application. Usually, their actual processing time less than its30% of total processing time. In addition, need skilled workers to operate ordinary lathe, the worker's salary highAnd difficult to hire. However, most of the time but operating workers spend on simply repeating adjustment and observation scraps process. Therefore, in order to reduce or totally not to hire this kind of skilled workers, hex lathe, threaded processing lathe and otherTypes of semi-automatic and automatic lathe has well developed, and has been widely applied in production.车床介绍车床主要是为了进行车外圆、车端面和镗孔等项工作而设计的机床。
机械类数控外文翻译外文文献英文文献数控.doc
Numerical ControlOne of the most fundamental concepts in the area of advanced manufacturing technologies is numerical control (NC).Prior to the advent of NC, all machine tools were manual operated and controlled. Among the many limitations associated with manual control machine tools, perhaps none is more prominent than the limitation of operator skills. With manual control, the quality of the product is directly related to and limited to the skills of the operator . Numerical control represents the first major step away from human control of machine tools.Numerical control means the control of machine tools and other manufacturing systems though the use of prerecorded, written symbolic instructions. Rather than operating a machine tool, an NC technician writes a program that issues operational instructions to the machine tool, For a machine tool to be numerically controlled , it must be interfaced with a device for accepting and decoding the p2ogrammed instructions, known as a reader.Numerical control was developed to overcome the limitation of human operator , and it has done so . Numerical control machines are more accurate than manually operated machines , they can produce parts more uniformly , they are faster, and the long-run tooling costs are lower . The development of NC led to the development of several other innovations in manufacturing technology:1.Electrical discharge machining.ser cutting.3.Electron beam welding.Numerical control has also made machine tools more versatile than their manually operated predecessors. An NC machine tool can automatically produce a wide variety of par4s , each involving an assortment of undertake the production of products that would not have been feasible from an economic perspective using manually controlled machine tools and processes.Like so many advanced technologies , NC was born in the laboratories of the Massachusetts Institute of Technology . The concept of NC was developed in the early 1950s with funding provided by the U.S Air Force .In its earliest stages , NC machines were able to make straight cuts efficiently and effectively.However ,curved paths were a problem because the machine tool had to be programmed to undertake a series of horizontal and vertical steps to produce a curve. The shorter is the straight lines making up the step ,the smoother is 4he curve . Each line segment in the steps had to be calculated.This problem led to the development in 1959 of the Automatically Programmed Tools (APT) language for NC that uses statements similar to English language to define the part geometry, describe the cutting tool configuration, and specify the necessary motions. The development of the APT language was a major step forward in the further development of NC technology. The original NC system were vastly different from those used punched paper , which was later to replaced by magnetic plastic tape .A tape reader was used to interpret the instructions written on the tape for the machine .Together, all /f this represented giant step forward in the control of machine tools . However ,there were a number of problems with NC at this point in its development.A major problem was the fragility of the punched paper tape medium . It was common for the paper containing the programmed instructions to break or tear during a machining process, This problem was exacerbated by the fact that each successive time a part was produced on a machine tool, the paper tape carrying the programmed instructions had to rerun thought the reader . If it was necessary to produce 100 copies of a given part , it was also necessary to run the paper tape thought the reader 100 separate times . Fragile paper tapes simply could not withstand the rigors of shop floor environment and this kind of repeated use.This led to the development of a special magnetic tape . Whereas the paper tape carried the programmed instructions as a series of holes punched in the tape , theThis most important of these was that it was difficult or impossible to change the instructions entered on the tape . To make even the most minor adjustments in a program of instructions, it was necessary to interrupt machining operations and make a new tape. It was also still necessary to run the tape thought the reader as many times as there were parts to be produced . Fortunately, computer technology become a reality and soon solved the problems of NC, associated with punched paper and plastic tape.The development of a concept known as numerical control (DNC) solve the paper and plastic tape problems associated with numerical control by simply eliminating tape as the medium for carrying the programmed instructions . In direct numerical control, machine tools are tied, via a data transmission link, to a host computer and fed to the machine tool as needed via the data transmission linkage. Direct numerical control represented a major step forward over punched tape and plastic tape. However ,it is subject to the same limitation as all technologies that depend on a host computer. When the host computer goes down , the machine tools also experience down time . This problem led to the development of computer numerical control.The development of the microprocessor allowed for the development of programmable logic controllers (PLC) and microcomputers . These two technologies allowed for the development of computer numerical control (CNC).With CNC , each machine tool has a PLC or a microcomputer that serves the same purpose. This allows programs to be input and stored at each individual machine tool. CNC solved the problems associated downtime of the host computer , but it introduced another problem known as data management . The same program might be loaded on ten different microcomputers with no communication among them. This problem is in the process of being solved by local area networks that connectDigital Signal ProcessorsThere are numerous situations where analog signals to be processed in many ways, like filtering and spectral analysis , Designing analog hardware to perform these functions is possible but has become less and practical, due to increased performance requirements, flexibility needs , and the need to cut down on development/testing time .It is in other words difficult pm design analog hardware analysis of signals.The act of sampling an signal into thehat are specialised for embedded signal processing operations , and such a processor is called a DSP, which stands for Digital Signal Processor . Today there are hundreds of DSP families from as many manufacturers, each one designed for a particular price/performance/usage group. Many of the largest manufacturers, like Texas Instruments and Motorola, offer both specialised DSP’s for certain fields like motor-control or modems ,and general high-performance DSP’s that can perform broad ranges of processingtasks. Development kits an` software are also available , and there are companies making software development tools for DSP’s that allows the programmer to implement complex processing algorithms using simple “drag ‘n’ drop” methodologies.DSP’s more or less fall into t wo categories depending on the underlying architecture-fixed-point and floating-point. The fixed-point devices generally operate on 16-bit words, while the floating-point devices operate on 32-40 bits floating-point words. Needless to say , the fixed-point devices are generally cheaper . Another important architectural difference is that fixed-point processors tend to have an accumulator architecture, with only one “general purpose” register , making them quite tricky to program and more importantly ,making C-compilers inherently inefficient. Floating-point DSP’s behave more like common general-purpose CPU’s ,with register-files.There are thousands of different DSP’s on the market, and it is difficult task finding the most suitable DSP for a project. The best way is probably to set up a constraint and wishlist, and try to compare the processors from the biggest manufacturers against it.The “big four” manufacturers of DSPs: Texas Instruments, Motorola, AT&T and Analog Devices.Digital-to-analog conversionIn the case of MPEG-Audio decoding , digital compressed data is fed into the DSP which performs the decoding , then the decoded samples have to be converted back into the analog domain , and the resulting signal fed an amplifier or similar audio equipment . This digital to analog conversion (DCA) is performed by a circuit with the same name & Different DCA’s provide different performance and quality , as measured by THD (Total harmonic distortion ), number of bits, linearity , speed, filter characteristics and other things.The TMS320 family DQP of Texas InstrumentsThe TLS320family consists of fixed-point, floating-point, multiprocessor digital signal processors (D[Ps) , and foxed-point DSP controllers. TMS320 DSP have an architecture designed specifically for real-time signal processing . The’ F/C240 is a number of the’C2000DSP platform , and is optimized for control applications. The’C24x series of DSP controllers combines this real-time processing capability with controller peripherals to create an ideal solution for control system applications. The following characteristics make the TMS320 family the right choice for a wide range of processing applications:--- Very flexible instruction set--- Inherent operational flexibility---High-speed performance---Innovative parallel architecture---Cost effectivenessDevices within a generation of the TMS320 family have the same CPU structure but different on-chip memory and peripheral configurations. Spin-off devices use new combinations of On-chip memory and peripherals to satisfy a wide range of needs in the worldwide electronics market. By integrating memory and peripherals onto a single chip , TMS320 devices reduce system costs and save circuit board space.The 16-bit ,fixed-point DSP core of the ‘C24x devices provides analog designers a digital solution that does not sacrifice the precision and performance of their system performance can be enhanced through the use of advanced control algorithms for techniquessuch as adaptive control , Kalman filtering , and state control. The ‘C24x DSP controller offer reliability and programmability . Analog control systems, on the other hand ,are hardwired solutions and can experience performance degradation due to aging , component tolerance, and drift.The high-speed central processing unit (CPU) allows the digital designer to process algorithms in real time rather than approximate results with look-up tables. The instruction set of these DSP controllers, which incorporates both signal processing instructions and general-purpose control functions, coupled with the extensive development time and provides the same ease of use as traditional 8-and 16-bit microcontrollers. The instruction set also allows you to retain your software investment when moving from other general-purp ose‘C2xx generation ,source code compatible with the’C2x generation , and upwardly source code compatible with the ‘C5x generation of DSPs from Texas Instruments.The ‘C24x architecture is also well-suited for processing control signals. It uses a 16-bit word length along with 32-bit registers for storing intermediate results, and has two hardware shifters available to scale numbers independently of the CPU . This combination minimizes quantization and truncation errors, and increases p2ocessing power for additional functions. Such functions might include a notch filter that could cancel mechanical resonances in a system or an estimation technique that could eliminate state sensors in a system.The ‘C24xDSP controllers take advantage of an set of peripheral functions that allow Texas Instruments to quickly configure various series members for different price/ performance points or for application optimization.This library of both digital and mixed-signal peripherals includes:---Timers---Serial communications ports (SCI,SPI)---Analog-to-digital converters(ADC)---Event manager---System protection, such as low-voltage and watchdog timerThe DSP controller peripheral library is continually growing and changing to suit the of tomorrow’s embedded control marke tplace.The TMS320F/C240 is the first standard device introduced in the ‘24x series of DSP controllers. It sets the standard for a single-chip digital motor controller. The ‘240 can execute 20 MIPS. Almost all instructions are executed in a simple cycle of 50 ns . This high performance allows real-time execution of very comple8 control algorithms, such as adaptive control and Kalman filters. Very high sampling rates can also be used to minimize loop delays.The ‘ 240 has the architectural features necessary for high-speed signal processing and digital control functions, and it has the peripherals needed to provide a single-chip solution for motor control applications. The ‘240 is manufactured using submicron CMOS technology, achieving a log power dissipation rating . Also included are several power-down modes for further power savings. Some applications that benefit from the advanced processing power of the ‘240 include:---Industrial motor drives---Power inverters and controllers---Automotive systems, such as electronic power steering , antilock brakes, and climatecontrol---Appliance and HV AC blower/ compressor motor controls---Printers, copiers, and other office products---Tape drives, magnetic optical drives, and other mass storage products---Robotic and CNC milling machinesTo function as a system manager, a DSP must have robust on-chip I/O and other peripherals. The event manager of the ‘240 is unlike any other available on a DSP . This application-optimized peripheral unit , coupled with the high performance DSP core, enables the use of advanced control techniques for high-precision and high-efficiency full variable-speed control of all motor types. Include in the event manager are special pulse-width modulation (PWM) generation functions, such as a programmable dead-band function and a space vector PWM state machine for 3-phase motors that provides state-of-the-art maximum efficiency in the switching of power transistors.There independent up down timers, each with it’s own compare register, suppo rt the generation of asymmetric (noncentered) as well as symmetric (centered) PWM waveforms.Open-Loop and Closed-Loop ControlOpen-loop Control SystemsThe word automatic implies that there is a certain amount of sophistication in the control system. By automatic, it generally means That the system is usually capable of adapting to a variety of operating conditions and is able to respond to a class of inputs satisfactorily . However , not any type of control system has the automatic feature. Usually , the automatic feature is achieved by feed.g the feedback structure, it is called an open-loop system , which is the simplest and most economical type of control system.inaccuracy lies in the fact that one may not know the exact characteristics of the further ,which has a definite bearing on the indoor temperature. This alco points to an important disadvantage of the performance of an open -loop control system, in that the system is not capable of adapting to variations in environmental conitions or to external disturbances. In the case of the furnace control, perhaps an experienced person can provide control for a certain desired temperature in the house; but id the doors or windows are opened or closed intermittently during the operating period, the final temperature inside the house will not be accurately regulated by the open-loop control.An electric washing machine is another typical example of an open-loop system , because the amount of wash time is entirely determined by the judgment and estimation of the human operator . A true automatic electric washing machine should have the means of checking the cleanliness of the clothes continuously and turn itsedt off when the desired degised of cleanliness is reached.Closed-Loop Control SystemsWhat is missing in the open-loop control system for more accurate and more adaptable control is a link or feedback from the output to the input of the system . In order to obtain more accurate bontrol, the controlled signal c(t) must be fed back and compared with the reference input , and an actuating signal proportional to the difference of the output and the input must be sent through the system to correct the error. A system with one or more feedback pat(s like that just described is called a closed-loop system. human being are probably the most complex and sophisticated feedback control system in existence. A humanbeing may be considered to be a control system with many inputs and outputs, capable of carrying out highly complex operations.To illustrate the human being as a feedback control system , let us consider that the objective is to reach for an object on aperform the task. The eyes serve as a sensing device which feeds back continuously the position of the hand . The distance between the hand and the object is the error , which is eventually brought to zero as the hand reacher the object. This is a typical example of closed-loop control. However , if one is told to reach for the object and then is blindolded, one can only reach toward the object by estimating its exact position. It isAs anther illustrative example of a closed-loop control system, shows the block diagram of the rudder control system ofThe basic alements and the bloca diagram of a closed-loop control system are shown in fig. In general , the configuration of a feedback control system may not be constrained to that of fig & . In complex systems there may be multitude of feedback loops and element blocks.数控在先进制造技术领域最根本的观念之一是数控（NC）。
数控机床刀具设计论文中英文资料外文翻译文献综述
数控机床刀具设计中英文资料英语原文：Design Of Tool Machine PropResearch significanceThe original knife machine control procedures are designed individually, not used tool management system, features a single comparison, the knife only has to find the tool knife, knife positioning the shortest path, axis tool change, but does not support large-scale tool.Automatic knife in the knife election, in the computer memory knife-election on the basis of using the Siemens 840 D features, and the election procedures knife more concise, and complete the space Daotao View. ATC use the knife rapid completion of STEP-7 programming, and have been tested in practice. In the positioning of the knife, PLC controlled modular design method, which future production of similar machines will be very beneficial, it is easy to use its other machine. Automatic tool change systems will be faster growth, reduced tool change time, increase the positioning accuracy tool is an important means to help NC technology development.Tool and inventory components of modern production is an important link in the management, especially for large workshop D features, and the election procedures knife more concise, and complete the space Daotao View. ATC use the knife rapid completion of STEP-7 programming, and have been tested in practice. In the positioning of the knife, PLC controlled modular design method, which future production of similar machines will be very beneficial, it is easy to use its oth management. The traditional way of account management, and low efficiency, high error rate, and not sharing information and data, tools and the use of state can not track the life cycle, are unable to meet the current information management needs. With actual production, we have to establish a workshop tool for the three-dimensional tool storage system to meet the knife workshop with auxiliary storage and management needs.The system uses optimization technology, a large number of computer storage inventory information, timely, accurate, and comprehensive tool to reflect the inventory situation. The entire system uses a graphical interface, man-machine dialogue tips from the Chinese menu, select various functions can be realized and the importation of all kinds of information. Management system using online help function. Through the workshop management, network management and sharing of information. Have automated inventory management, warehousing management tool, a tool for the management and statistical functions.1.System components and control structureThe entire system, including the structure and electrical machinery control systems.1.1.1Mechanical structure and working principleTool from the stent, drive, drive system, Turret, shielding, control system, and electrical components. Support from the column, beam, the upper and lower guide Central track, and track support component.1) Drive for the system chosen VVVF method. Cone used brake motors, with VVVF by Cycloid reducer through sprocket drive.2) Drag a variable frequency drive system and control technology. VVVF adopted, will speed drive shaft in the normal range adjustment to control the speed rotary turret to 5 ~ 30mm in, the drive shaft into two, two under through sprocket, the two profiled rollers Chain driven rotating shelves. Expansion chain adopted by the thread tight regulation swelling, swelling the regular way. - Conditi D features, and the election procedures knife more concise, and complete the space Daotao View. ATC use the knife rapid completion of STEP-7 programming, and have been tested in practice. In the positioning of the knife, PLC controlled modular design method, which future production of similar machines will be very beneficial, it is easy to use its at six other Des V oeux a knife, can be categorized with some of knife auxiliary equipment, such as bits, such as turning tools.1.1.2.Electrical Control SystemThis tool storage systems is the main electrical control their shelves for operational control and position control. Operational control equipment, including operation of the start of braking control. Position Control is the main location and address of the shelves for testing.1) Electric Transmission horizontal rotary tool storage systems are the mechanical movements are repeated short-term work system. And the run-time system needs some speed, speed transmission needs, the system will use VVVF method can be used simple structure, reliable operation of the motor and frequency inverter.2) Control of the system is divided into two kinds of manual control and automatic control, manual control as a general reserve and debugging methods of work; ways to the system control computer (IPC) and the control unit (inverter contactor , etc.) consisting of a control system.3) location and positioning accuracy of the system automatically identify the site and location using a detection device tion, timely, accurate, and comprehensive tool to reflect the inventory situation. The entire system uses a graphical interface, man-machine dialogue tips from the Chinese menu, select various functions can be realized and the importation of all kinds of information. Management system using online help function. Through the workshop management, network management and sharing of information. Have automated inventory management, warehousing management tool, a tool for the management and statistical fu as proximity switches, relays through the plate-point isolation and the number plate recorded close to the switching signal acquisition and operation of Hutchison with a Optimal Path addressable identify the current location and shelves of the purpose of the shelf location. In order to enable a more accurate positioning system, adopted two photoelectric switches, to detect the two shelves of the two films.1.2.The functions of the knifeknife The is the role of reserves a certain number of tools, machine tool spindle in hand to achieve the fungibility a disc sc knife in the library with discoid knife, cutting tool along See how vertical arrangement (including radial and axial from knife from knife), along See how radial array into acute or arranged in the form of the knife. Simple, compact, more applications, but are ring-cutter, low utilization of space. Figure 2.7 a) to c). D features, and the election procedures knife more concise, and complete the space Daotao View. ATC use the knife rapid completion of STEP-7 programming, and have been tested in practice. In the positioning of the knife, PLC controlled modular design method, which future production of similar machines will be very beneficial, it is easy to use its. If the knife cutter knife is the type of library, the chain knives, and other means, in the form of the knifeand capacity according to the Machine Tool to determine the scope of the process.s, but are ring-cutter, low utilization of space. Figure 2.7 a) to c). D features, and the election procedures knife more concise, and com mon typesThe knife is a tool storage devices, the common knife mainly in the following forms:(1) the turret knifeIncluding the first level turret vertical turret and the first two, see Figure 2.6 a) and b):(2) the disc cutterDisc knife in the library with discoid knife, cutting tool along See how vertical arrangement (includingradial and axial from knife from knife), along See how radial array into acute or arranged in the form of theknife. Simple, compact, more applications, but are ring-cutter, low utilization of space. Figure 2.7 a) to c).D features, and the election procedures knife more concise, and complete the space Daotao View. ATC use theknife rapid completion of STEP-7 programming, and have been tested in practice. In the positioning of theknife, PLC controlled modular design method, which future production of similar machines will be verybeneficial, it is easy to use its. If the knife storage capacity must be increased to increase the diameter of theknife, then the moment of inertia also increased correspondingly, the election campaign long knife. Toolnumber not more than 32 general. Cutter was multi-loop order of the space utilization knife, but inevitablygiven the knife from complex institutions, applicable to the restricted space Machine Tool storage capacity andmore occasions. Two-disc structure is two smaller capacity knife on both sides of the sub-spindle place, morecompact layout, the number ofapply to small and medium-sizedprocessing center.(3) the chain knife Includingsingle-and multi-ring chain ringchain, chain link can take many forms change, see Figure 2.8 a) to c), the basic structure shown in Figure 2. 8 doFeatures: knife apply to the larger capacity of the occasion, the space of the small number of generally applicable to the tool in the 30-120. Only increase the length of the chain tool will increase the number should not be increased circumferential speed of its moment of inertia of the knife does not increase the disc as large.(4) linear combination knife and the knife libraryThe linear knife simple structure in Figure 2.9, tool single order, the capacity of small knife, used for CNC lathe and drill press on. Because the location of fixed knife, ATC completed action by the spindle without manipulator. The cutter knife is generally the turret combination turret with a combination of the disc cutter knife and the chain combination. Every single knife the knife certificates of smaller, faster tool change. There are also some intensive drum wheel, and the lattice-type magazine for the knife, the knife-intensive though.Small footprint, but because of structural constraints, basically not used for single processing center, the concentration used for FMS for the knife system.1.4 Tool storage capacityTool storage capacity of the first to consider the needs of processing, from the use of point of view,generally 10 to 40 knives, knife will be the utilization of the high, and the structure is compact.1.5 Tool options(1) choose to order processing tool according to the order, followed Add to the knife every knife in the Block. Each tool change, the order of rotation of a cutter knife on location, and remove the need knives, has been used by the cutter knife can be returned to the original Block, can also order Add Block, a knife. However, as the knife in the tool in different processes can not be repeated use of the knife must increase the capacity and lower utilization rate.(2) most of the arbitrary choice of the current system of using arbitrary NC election knives, divided into Daotao coding, coding and memory-cutter, three. Daotao coding tool code or knives or Daotao need to install the code used to identify, in accordance with the general principle of binary coding coding. Tool knife election coding method uses a special knife handle structure, and each of the coding tool. Each of the tool has its own code, thereby cutting tool can be in different processes repeatedly used, not to replace the tool back at the original knife, the knife capacity can be reduced accordingly. Memory-election this paper knife, in this way can knives and knife in the position corresponding to the Daotao memory of the PLC in the NC system, no matter which tool on the Inner knife, tool information is always there in mind, PLC . On the knife with position detection devices, will be the location of each Daotao. This tool can be removed and sent back to arbitrary. On the knife is also a mechanical origin, every election, the nearest knife selection.1.6.Control of the knife(1) the knife as a system to control the positioning axis. In the ladder diagram in accordance with the instructions for computing T code comparison of the output angle and speed of instructions to the knife the knife servo drive servo motor. Tool storage capacity, rotation speed, and / deceleration time, and other system parameters can be set in such a manner free from any outside influence positioning accurate and reliable but the cost is higher.(2) knife from the hydraulic motor drives, fast / slow the points, with proximity switches count and positioning. In comparison ladder diagram of the current storage system knife (knife spindle) and goals knife (pre-knife) and computing, then output rotation instructions, judging by the shortest path rotation in place. This approach requires sufficient hydraulic power and electromagnetic valve knife the rotational speed can be adjusted through the throttle. But over time may be oily hydraulic, oil temperature and environmental factors impact the change in velocity and accuracy. Not generally used in large and medium-sized machine tool change frequently.(3) the knife from AC asynchronous motor driven cam mechanism (Markov institutions), with proximity switches count, which means stable operation, and generally accurate and reliable positioning cam used in conjunction with a mechanical hand, ATC fast-positioning.2. ATC, the main types, characteristics, and the scope of application2.1 Auto Rotary ToolRotary Tool automatically on the use of CNC machine tool is a simpleinstallation of automatic tool change, the Quartet and 47.60 Turret Tool various forms, such as rotary turret were installed on four, six or more of the Tool , NCinstructions by ATC. Rotary Tool has two vertical and horizontal, relatively simple structure, applicable to economic CNC lathe.Rotary Tool in the structure must have good strength and stiffness, resistance to bear rough Cutting Tool in the cutting force and reduce the role of deformation and improve processing accuracy. Rotating Tool to choose reliable positioning programme structure and reasonable position, in order to ensure that each rotary turret to a higher position after repeated positioning accuracy (typically 0.001 to 0.005mm). Figure 2.1 shows the spiral movements of the Quartet Turret.Auto Rotary Tool in the simplest of ATC, is 180 º rotary ATC devices, as shown in Figure 2.2 ATC instructions received, the machine control system put ATC spindle control to the designated location at the same time, the tool movement to the appropriate location, ATC, with the rotary axis and at the same time, the knives matching tool; drawbars from Spindle Cutting Tools rip, ATC, will be the tool from their position removed; ATC, 180 º rotary tool spindle and the tool and tool away; ATC, the Rotary At the same time, thetool refocusing its position to accept Spindle removed from the cutting tool; Next, ATC, will be replaced with the cutter knives were unloaded into the spindle and tool: Finally, back to the original ATC, "standby" position. At this point, ATC completed procedures to continue to run. This ATC, the main advantage of simple structure,the less movement, fast tool change. The main disadvantage is that knives must be kept in parallel with the axis of the plane, and after the home side compared to the tool, chip and liquid-cutting knife into the folder, it is necessary to the tool plus protection. Cone knife folder on the chip will cause ATC error, or even damage knife folders, and the possibility of spindle. Some processing centre at the transfer, and the tool side. When the ATC command is called, the transfer-cutter knives will be removed, the machine go forward, and positioning with the ATC, in line with the position. 180 º "Rotary ATC devices can be used horizontal machine, can also be used for vertical machining centers.2. 2 ATC head-turret installedWith rotating CNC machine tool often used such ATC devices, with a few turret head spindle, each with a spindle on both knives, the first tower interim process can be automatic tool change-realization. The advantage is simple structure, tool change time is short, only about 2 s. However, due to spatial constraints, the number of spindle can not be too much, usually only apply to processes less, not to high precision machine tools, such as the NC drill, such as CNC milling machine. In recent years there has been a mechanical hand and the turret head with a knife for the automatic tool change ATC devices, as shown in Figure 2.3. It is in fact a turret head ATC, and the knife-ATC device combination. The principle is as follows:5 turret on the first two tool spindle 3 and 4, when using the tool spindle 4 processing tool, the manipulator 2 will be the next step to the need for the tool does not work on the tool spindle 3 until after the completion of this process , the first rotary turret 180 º, ATC completed. ATC most of their time and processing time coincidence, the only real tool change time turret transposition of the first time, this approach mainly used for ATC and NC NC drilling file bed.2. 3.Daidao system for the automatic tool changeFigure 2.4 shows the knife and the whole machine tool CNC machine tools for the appearance of Fig. Figure 2.5 shows the knife and split-type machine to the appearance of CNC machine tool plans.At this point, knife storage capacity, a heavier tool can, and often additional transport unit to complete the knife between the spindle and cutting tool transport.Daidao the knife from the ATC, the election knives, automatic loading and unloading machine tool and tool exchange institutions (manipulator), composed of four parts, used widely.Tool Automatic Tool Change When CNC tool code and the code in line with directives of the tool selected, the rotary cutter knives will be sent to the ATC position, waiting to grab manipulator. Random knife election is the advantage of the cutter knife in the order has nothing to do with the processing sequence, the same tool can be used repeatedly. Therefore, the relatively small number of knives, knife the corresponding smaller. Random elections knife on the tool must be coded to identify. There are three main coding.1. Tool coding. Adopt special knife handle structure coding, the drawbars on the knife handle back-endpackages such as spacing of the coding part of the lock-nut fixed. Coding diameter ring diameter of a size two,respectively, said that binary "1" and "0" to the two rings are different, can be a series of code. For example, there are six small diameter of the ring can be made to distinguish between 63 (26-1 = 63) of the coding tool. All of 0 normally not allowed to use the the manipulator system, the whole process more complicated ATC. We must first used in the processing of all installed in the standard tool on the knife handle in the machine outside the pre-size, according to a certain way Add to the knife. ATC, selected first in the knife knife, and then from ATC, from the knife from the knife or spindle, exchange, the new knife into the spindle, the old knife back into the knife.ATC, as the former two knives to accommodate a limited number can not be too many, can not meet the needs of complex parts machining, CNC machine tool Automatic Tool Change Daidao the use of the automatic tool change devices. The knife has more capacity, both installed in the spindle box side or above. As for the automatic tool change Daidao device CNC machine tool spindle box only a spindle, spindle components to high stiffness to meet the machining requirements. The number of establishments in larger knife, which can meet the more complex parts of the machining processes, significantly improving productivity. Daidao system for the automatic tool change applied to drilling centres and CNC machining centers. The comparison drawn Daidao automatic tool change system is the most promising.3.PLC control of the knife random mode of election3. 1Common methods of automatic election knifeAutomatic control of the knife CNC refers to the system after the implementation of user instructions onthe knife library automation process, including the process to find knives and automatic tool change [(63,71]. CNC Machining Center device (CNC) directive issued by the election knife , a knife, the tool required to take the knife position, said the election automatic knife. automatically elected knife There are two ways: randomsequence election knives and knife election method.3.1.1 order election knifeTool Selection order is the process tool according to the sequence of the insert knife, the use of knives in order to take place, used knives back at the original knife, can also order Add Block, a knife. In this way, no need Tool identification devices, and drive control is a relatively simple, reliable and can be used directly from the points of the knife machinery to achieve. But the knives in each of the tool in different processes can not be reused, if the tool is installed in accordance with the order of the knife, there will be serious consequences. Theneed to increase the number of knives and knife the capacity of the tool and reduce the utilization of the knife.3.1.2Random election knifeRandom election under the knife is arbitrary instructions to select the required tools, then there must be tool identification devices. Tool knife in the library do not have the processing in accordance with the order of the workpiece can be arbitrary storage. Each of the tool (or knife blocks) are for a code, automatic tool change, the rotary cutter, every tool have been the "tool identification device" acceptable identification. When CNCtool code and the code in line with directives of the tool selected, the rotary cutter knives will be sent to the ATC position, waiting to grab manipulator. Random knife election is the advantage of the cutter knife in the order has nothing to do with the processing sequence, the same tool can be used repeatedly. Therefore, the relatively small number of knives, knife the corresponding smaller. Random elections knife on the tool must be coded to identify. There are three main coding.1. Tool coding. Adopt special knife handle structure coding, the drawbars on the knife handle back-end packages such as spacing of the coding part of the lock-nut fixed. Coding diameter ring diameter of a size two, respectively, said that binary "1" and "0" to the two rings are different, can be a series of code. For example, there are six small diameter of the ring can be made to distinguish between 63 (26-1 = 63) of the coding tool. All of 0 normally not allowed to use the code, to avoid the cutter knife Block did not confuse the situation.2. Knife Block coding. On the knife Block coding, coding tool, and tool into line with the number of knives in the Block. ATC knife when the rotation, so that each knife seats followed through knowledge knife, knife found blocks, knives stopped the rotation. At this time there is no knife handle encoding part of the knife handle simplified.3. Annex coding methods. This style of coding keys, coded cards, coding and coding-disc, which is the most widely used coding keys. First to knives are attached to a tool of the show wrapped coding keys, and when the cutter knife to the store at knife in, so put the number of keys to remember knife Block Road, will be inserted into key to the coding Block next to the key hole in the seat for the knife to the numbers. ConclusionFocused on in today's manufacturing environment tool storage and management of new models and methods, practical application of good results in systems integration and optimization, and other aspects of operations will be further explored, so that it has a higher theoretical and practical level.译文：机床刀具设计课题研究意义机床原来的刀库控制程序是单独设计的，没有采用刀具管理系统，功能也比较单一，只实现了刀库刀具的找刀、刀库最短路径定位、主轴换刀，而且不支持大型刀具。
数控车床自动回转刀架英文文献以及翻译
Boolean operations for 3D simulation of CNC machiningof drilling toolsDani Tost*, Anna Puig, Lluı´s Pe´rez-VidalSoftware Department, Polytechnical University of Catalonia, Spain Accepted 25 April 2003AbstractThis paper addresses the simulation of drilling tools CNC machining. It describes a novel approach for the computation of the boundary representation of the machined tools. Machining consists of a sequence of Boolean operations of difference between the tool and the grinding wheels through time. The proposed method performs the dynamic Boolean operations on cross sections of the tool and it reconstructs the 3Dmodel by tiling between the cross sections. The method is based on classical computational geometry algorithms such as intersection tests,hull computations, 2D Boolean operations and surface tiling. This approach is efficient and it provides user control on the resolution of the operations.Abstract This paper addresses the simulation of drilling tools CNC machining. It describes a novel approach for the computation of the boundary representation of the machined tools. Machining consists of a sequence of Boolean operations of difference between the tool and the grinding wheels through time. The proposed method performs the dynamic Boolean operations on cross sections of the tool and it reconstructs the 3Dmodel by tiling between the cross sections. The method is based on classical computational geometry algorithms such as intersection tests,hull computations, 2D Boolean operations and surface tiling. This approach is efficient and it provides user control on the resolution of the operations.q 2003 Elsevier Ltd. All rights reserved.Keywords: CNC simulations; Bores machining; Computationalgeometry; Boolean operations; Surface tiling1. IntroductionMost of the research on CNC in CAD is centered on theautomatic computation of tool paths [5,13]. Given a final tool design, the optimal trajectories of the tool and the grinding wheels must be computed yielding as final result the CNC code. Machining simulation and verification hasexactly the opposite goal: to calculate the tool starting from the CNC code and from a geometrical model of the machine, the wheels and the tool before machining. This simulation has three main applications [6]. First, it detects eventual collisions between the tool or any of the grinding wheels and the rest of the machine. It is important to avoid collisions because serious damages to the machines can follow. Next, simulation provides a means of visually verifying the efficiency of the trajectories, which may result in faster and cheaper processes. Finally, the simulation allows users to check if the surface of the resulting tool is effectively the desired one. In the routine practice of machining, experienced operators have enough skills to imagine the tool final shape by only reading the CNC code.However, they are generally not able to do so with new or non-standard designs. Therefore, the use of a simulation system decreases considerably the tool production cost because it avoids the trial and error process on the real machine with costly materials that is otherwise necessary.This paper addresses a particular type of CNC machining simulation: the grinding of bores and cutters. Conventional CAD systems do not provide a means of realizing this type of simulations and specific applications are needed. Until recently, most of thesimulation applications dealt only with the machining of 2D cross-sections of the tools and they were restricted to the main fluting operation [3]. Three dimensional applications are rather recent [4,23]. They provide a machining simulation for specific 5-axes machines and they are not applicable to general movements. This paper presents a novel approach for the computation of the external shape of the tools through a sequence of coordinated movements of the tool and the wheels on machines of up to 6-axes. The proposed method reduces the 3D problem to 2D dynamic Boolean operations followed by a surface tiling. The 2D solution involves different techniques of planar computational geometry: from intersections to hull computations.The paper is structured as follows. In Section 2 we review previous approaches on machining simulations.Section 3 describes briefly the contour conditions of the simulation. Finally, Section 4 describes the computation of Boolean operations and the results of the implementation are shown in Section 5.2. Previous workMachining can be considered a dynamic Boolean operation of difference between the grinding wheel and the tool. It is dynamic, because both the tool and the wheels move along time through rotations and translations.The Vector Cut [8,10], is probably the most referenced numerical control simulation method. It is an approximate solution that represents the frontier as a set of points and normal vectors that will be cut along the path of the grinding wheel. This method is effective for the simulation of sculptured surface polishing, but it is not extensible to complex motions of the tool and/or the grinding wheels. It is mainly useful to detect mistakes in the path suggestedby the presence of abnormally high or small cut vectors. Besides, except for the extension of Ref. [16], it does not yield directly a model of the bit to be machined.An alternative strategy for machining simulation consists of realizing a sequence of 3D static Boolean operations through time. The main drawback of this strategy is its high computational cost. According to Ref. [11], this is proportional to the number of discrete positions to the fourth. This puts it out of question, in practical terms.Another problem it shows is the granularity of the temporal discretization : it must be very fine if precision in the final tool is required. This means that very little material is cut off in each Boolean operation, and that may entail robustness problems in the computations. A possible method to avoid both problems is to discretize the initial tool model into a voxel or an octree model, [20], to perform all the sequence of Boolean operations on the discrete model and then reconstruct the machined surface, at the end. This approach benefits from the fact that the cost of discrete Boolean operations is much lower and the reconstruction phase at the end of the process is done as late as possible. This option requires the sequence of movements to be specified in terms of relative motion of the grinding wheel, while the tool and its discretization remain fixed. This prerequisite is not always valid and, in particular, it does not hold for the general case of 6-axes machines.Finally, another option taken into account is that of the computation of the volume swept by the tool and the grinding wheel in their motions. A geometric representation of this volume would allow performing only one Boolean difference operation between the two volumes. The main difficulty of this option is the computation of sweptvolumes. There are several references [1,2,21] on this subject, that contain methods generally applied in CAD for extrusions, collisiondetection, and other problems but none of them can be applied to the non-trivial case of simultaneous motion of the two solids in play.The strategy proposed herein overcomes the disadvantages of these methods. It consists of a double discretization of four dimensional space (3D þ time) that reduces the general problem to a sequence of 2D Boolean operations and 3D geometric reconstructions. This algorithm is fast and it provides user-control on simulation accuracy.3. Scene modelThere are different types of machine tools for the fabrication of bores and cutters. They share the same general structure but they differ in the number of degrees of freedom. The method proposed herein deals with machines up to six degrees of freedom. These machines have a static vertical axis (Z in Fig. 1 on which the grinding wheel set can move up and down. One tool is placed on a spindle (the toolholder), that may translate on three axes (X; Y and U) and rotate on two axes (W in relation to the wheel axis and A relative to its own axis). At the beginning of the process, a tool has a piecewise cylindrical or conical shape. Its final shape is the result of a sequence of machining operations consisting of simultaneous movements of the tool and the wheels. The wheel shape is also piecewise cylindrical or conical. It remains unchanged during the process.The machining process is divided into a set of operations, each one with a specific name in CNC jargon. Each operation is performed using a specific wheel. This information is written in the CNC file.Specifically, the main operations are (in their usual order):Fig. 1. 6-Axes machine tool.Fig. 2. Machining operations on a tool.* Fluting: performing the lateral helicoidal of straight grooves* Gashing: cuts in the tool head* Outer diameter sharpening: edge sharpening of the lateral grooves* End face sharpening: edge sharpening of the tool head cuts* Notching: direct cut in the tool head.Fig. 2 shows a real bore and it indicates the operations that have given its shape.Each operation performs several symmetrical cuts in the tool shape. The tool shown in Fig. 2, for instance, has three lateral grooves realized during the ‘Fluting’ operation. Each cut is performed through a sequence of movements. In the CNC code, each movement corresponds to a line instruction specifying the motion axes (X; Y;U; A; or W for the tool and Z for the wheel) along with the amount of rotation or translation to be performed for each edge.4. Machining simulation4.1. OverviewOur approach uses the fact that the tools have a tubular shape. It consists of discretizing the tool in axial sections, performing the machining operations on these crosssections and finally, reconstructing the surface of the tool by tiling between cross-sections. Before machining, the cross-sections are circles. Afterwards, they have a complex shape that may even have been split into separate connected shells at the tool end.The movements are divided into blocks, each one corresponding to an CNC operation or even to one cut within an operation. The machining process is performed sequentially for each block. Therefore, as many intermediate models are created as instruction blocks exist. The initial tool is taken as input of the first machining process. Theresulting tool is used in the second block processing and so on. The surface reconstruction step can be performed on any of these intermediate models or, alternatively only on the last one.Therefore, the simulation process of each instructions block is composed of two steps:* A 2D Boolean operation process, that receives as input: (i) the tool representation, (ii) the machining wheel representation, (iii) a list of movements and that gives as output a new representation of the tool cross-sections.* A tiling process that completes the tool representation with the triangulation between contours.The second step, surface tiling, is a classical subject in computer graphics [14]. It consists of two related problems: (i) establishing correspondences between contours (branching problem) and (ii) searching correspondent vertices to form tiles (correspondence problem). Several solutions have been published to solve both problems based on minimizing the distance between successive contours [7,17] and interpolating in between contours [12]. The method used herein is an extension of these algorithms that adds to these criteria the constraint of tiling between segments of the contour corresponding to the same machining operation. This extension is described in depth in Ref. [22].4.2. Machining of the tool cross-sectionsThe computation of the new shape of tool cross section consists of three steps:* Computation through time of the intersections of the wheel cross sections and the external contour of the tool section. Bothsections are circular and, due to their relative orientation, their intersection is a segment. Therefore, the result of this step is a set of segments.* Calculation of the hulls of the segments set. These hulls are polygonal approximations of wheel cuts on the tool section.* Reconstruction of the tool cross section contour given its original shape and the hull curves.The pseudo-code algorithm below illustrates this process. Let st be the tool cross section at the beginning of the process, where the wheel and ml the movements list. The wheel is discretized into a set of circular cross-sections switch (procedures FirtSectWheel and NextSectWheel). The movement of switch and st is decomposed into a a set of successive positions (inner loop). For each position, the intersection between sw and st is computed in the procedure InterSect. If there is intersection, then the corresponding segment segm is stored in the segments list seglist. Then, the geometry of st, sw and seglist is updated to next positions in the procedure UpdateGeom. The position of st is reset at its initial location for each new wheel section. After all the wheel sections have been processed, the hulls of the segment list are computed in CompHulls and then clipped against the initial contour of st with the procedure Reconstruct.procedure CrossSection Machining(st: tSection,wh: tWheel, ml: tMovList)varsw: tSectionsegm: tSegmentseglist: tSegmentListhulls: tHullListfvarInitSegList(seglist)sw U FirstSectWheel (wh)while ValidSection(sw) doendo f mov U FALSEwhile : endo f mov doInterSect(st,sw, &segm, &status)if status ! InsertSegment(segm, seglist) endifUpdateGeom(ml, &st, &sw, &seglist, &endo fmov)endwhilesw U NextSectWheel(wh,sw)ResetToolPosition(&st)endwhileCompHulls(slist, &hulls)Reconstruct(hulls, &st)fprocedure4.2.1. Updating geometryEach movement instruction is realized at constant speed. Therefore, a movement can be decomposed into n constant intervals of translation in X; Y; Z and U along with rotation in W and A : δA=ΔA/n,δW=ΔW/n,δX=ΔX/n,δY=ΔY/n,δU=ΔU/n andδZ=ΔZ/n.As mentioned in Section 3, a line movement can be composed of several simultaneous instructions. Most of the tool movements are composed of translations and axial rotations, which are independent. Therefore, the order in which the update of each movement is done is irrelevant. However for conical tools with a round end called ‘ball nose’, simultaneous axial translations and colum n angle rotations are necessary. These two movements are obviously not independent. Thiscan be a source of error (Fig. 3) because the real machine rotates the tool column angle at the same time as it translates it along its axis, while in the simulation, for each time interval, the tool is first rotated and next translated along its axis. However, in these cases the original CNC is already decomposed as a set of very small movements with a resolution very similar to the one needed in the machining. Therefore, these movements are not further decomposed in the machining.The global coordinate system in which the geometry is expressed along time is sketched in Fig. 4. The axis coincide with the machine axis X; Y and Z at the tool home position at the beginning of machining. Let ct(xtk, ytk;,0.0)be the coordinates of the tool section center at instant k: The components of the normal vector of the section are ntk(nxtk, nytk,0.0). It should be noted that nxtk =cos(ωk) and nytk= sin(ωk); being vk the column angle of the tool at instant k: The updated values of these coordinates at k +1.Fig. 3. Non equivalent transformations.Fig. 4. Coordinate system, axes and motion.5. Conclusions and future workThis paper describes a novel method for the simulation of drilling tools CNC machining. Our approach simplifies the 4D (space t time) Boolean operations between the tool and the wheels by reducing them to a sequence of intersections between 2D perpendicular cross-sections along time. Specifically, the method discretizes the toolinto cross-sections and simulates machining on the cross sections. Next, the shape of the tool is recomputed by tiling between contours.The primary advantage of this approach is its simplicity. It addition, it provides user-control on the resolution of the simulation: spacing between crosssections as well as time interval between consecutive intersections.Starting from this work, new research and development lines are opened. Specifically, we are working on global pipelines that would put into the same process automatic CNC computation and tool verification. With such pipelines, given a final tool description, theCNC code to create it would be automatically computed, next using the CNC code as input, tool machining would be simulated. Finally, differences between the input and the output model could be computed and shown.钻探工具数控加工三维仿真的布尔运算摘要本文旨在对钻探工具数控加工的仿真研究。
数控机床改造中英文对照外文翻译文献
中英文对照外文翻译文献(文档含英文原文和中文翻译)原文:The Numerical Control Engine Bed TransformsHarvey B.M ackey First numerical control system development summary brief hi story and tendency.In 1946 the first electronic accounting machine was born the world,this indicated the humanity created has been possib le to strengthen and partially to replace the mental labor the tool. It with the humanity these which in the agricultu re, the industry society created only is strengthens the phy sical labor the tool to compare, got up the quantitive leap ,entered the information society for the humanity to laythe foundation.After 6 years, in 1952, computer technology applied to t he engine bed , the first numerical control engine bed were born in US. From this time on, the traditional engine bed has had the archery target change. Since nearly half centu ry, the numerical control system has experienced two stages and six generation of development.1.1 Numerical control (NC) stage (1952 ~ 1970)The early computer operating speed is low, was not big to then science computation and the data processing influence ,but could not adapt the engine bed real-time control reques t.The people can not but use numeral logic circuit "to buil d"to become an engine bed special purpose computer to take the numerical control system, is called the hardware connecti onnumerical control (HARD-WIRED NC), Jian Chengwei numerical c ontrol (NC). Along with the primary device development, this stage has had been through repeatedly three generations, na mely 1952 first generation of -- electron tube; 1959 second generation of -- transistor; 1965 third generation -- small scale integration electric circuit.1.2 Computer numerical control (CNC) stage (in 1970 ~ presen t)In 1970, the general minicomputer already appeared and th e mass production. Thereupon transplants it takes the numeric al control system the core part, from this time on entered the computer numerical control (CNC) the stage ("which should have computer in front of the general" two characters to ab breviate). In 1971, American INTEL Corporation in the world first time the computer two most cores part -- logic units and the controller, used the large scale integrated circuit technology integration on together the chip, called it the m icroprocessor (MICROPROCESSOR), also might be called the centr al processing element (to be called CPU).The microprocessor is applied to 1974 in the numerical c ontrol system. This is because minicomputer function too stro ng, controlled an engine bed ability to have wealthily (therefore once uses in controlling the multi- Taiwan engine bed at that time, called it group control), was inferior to use d the microprocessor economy to be reasonable. Moreover then small machine reliability was not ideal. The early microproce ssor speed and the function although insufficiently are also high, but may solve through the multi-processor structure. Because the microprocessor is the general-purpose calculator core part, therefore still was called the computer numerical control.In 1990, PC machine (personal computer, domestic custom had called microcomputer) the performance has developed tothe very high stage, may satisfiedly take the numerical cont rol system core part the request. Thenumerical control system henceforth entered based on the PC stage. In brief, the computer numerical control stage has also experienced three generations. Namely 1970 fourth generat ion of -- minicomputer; 1974 five dynasties -- microprocessor and 1990 sixth generation -- (overseas was called PC-BASED) based on PC.Also must point out, although overseas already renamed as the computer numerical control (namely CNC).Also must point out, although overseas already renamed as the computer numerical control (namely CNC), but our countr y still the custom called the numerical control (NC). Theref ore we daily say "numerical control", the materially already was refers to "computer numerical control".1.3 the numerical control future will develop tendency1.3.1 open style continues to, to develop based on the PC sixth generation of directionThe software and hardware resources has which based on P C are rich and so on the characteristic, the more numerical controls serial production factory can step onto this path. Uses PC machine to take at least its front end machine, pr ocesses the man-machine contact surface, the programming, the association .Question and so on net correspondence, undertakes the num erical control duty by the original system. PC machine has the friendly man-machine contact surface, will popularize to all numerical controls system. The long-distance communication, the long-distance diagnosis and the service will be more common.1.3.2 approaches and the high accuracy developmentThis is adapts the engine bed to be high speed and the high accuracy direction need to develop.1.3.3 develops to the intellectualized directionAlong with the artificial intelligence in the computer do mainunceasing seepage and the development, the numerical control system intellectualized degree unceasingly will enhance.(1) applies the adaptive control technologyThe numerical control system can examine in the process some important information, and the automatic control system related parameter, achieves the improvement system running sta tus the goal.(2) introduces the expert system instruction processingThe skilled worker and expert's experience, the processing general rule and the special rule store in the system, take the craft parameter database as the strut, the establishmenthas the artificial intelligence the expert system.(3)introduces the breakdown to diagnose the expert system(4) intellectualized numeral servo driveMay through the automatic diagnosis load, but the automat ic control parameter, causes the actuation system to obtain the best movement.Second, engine bed numerical control transformation necessi ty.2.1 microscopic looks at the transformation the necessityFrom on microscopic looked below that, the numerical cont rol engine bed has the prominent superiority compared to the traditional engine bed, moreover these superiority come from the computer might which the numerical control system contain s.2.1.1 may process the traditional engine bed cannot proce ss the curve, the curved surface and so on the complex com ponents.Because the computer has the excellent operation ability, may the instant accurately calculate each coordinate axis ins tant to be supposed the movement physiological load of exerc ise, therefore may turn round thesynthesis complex curve or the curved surface.2.1.2 may realize the processing automation, moreover is the flexible automation, thus the efficiency may enhance 3 ~ 7 times compared to the traditional engine bed.Because the computer has the memory and the memory prope rty, may the procedure which inputs remember and save, thenthe order which stipulated according to the procedure automat ic carries out, thus realization automation. The numerical co ntrol engine bed so long as replaces a procedure, may reali ze another work piece processing automation, thus causes the single unit and the small batch of production can automate, therefore is called has realized "flexible automation".2.1.3 processings components precision high, size dispersion d egree small, makes the assembly to be easy, no longer needs "to make repairs".2.1.4 may realize the multi- working procedures centralism, r educes the components in engine bed between frequent transpor ting.2.1.5 has auto-alarm, the automatic monitoring, automatic comp ensation and so on the many kinds of autonomy function, thu s may realize long time nobody to safeguard the processing.2.1.6 advantage which derives by above five.For example: Reduced worker's labor intensity, saved the labor force (a person to be possible to safeguard the multi - Taiwan engine bed), reduced the work clothes, reduced the new product trial manufacturing cycle and the production cycl e, might to the market demand make rapid reaction and so o n.Above these superiority are the predecessor cannot imagine, is an extremely significant breakthrough. In addition, the en gine bed numerical control carries out FMC (flexible manufact ure unit), FMS (flexible manufacture system) as well as CIMS (computer integration manufacture system) and so on the enter prise becoming an information based society transformation foundation. The numerical control technology already became the manufacturing industry automation the core technology and the foundation technology.2.2 great watches the transformation the necessityFrom on macroscopic looked that, the industry developed c ountry armed forces, the airplane weapon industry, in the en d of the 70's, at the beginning of the 80's started the l arge-scale application numerical control engine bed. Its essen ce is, uses the information technology to the traditional in dustry (including the armed forces, airplane weapon industry) carries on the technological transformations. Except that uses outside the numerical control engine bed, FMC, FMS in the m anufacture process, but also includes in the product developm ent carries out CAD, CAE, CAM, the hypothesized manufactureas well as carries out MIS in the production management (ma nagement information system), CIMS and so on. As well as in creases the information technology in its production product, including artificial intelligence and so on content. Because uses the information technology to the country foreign troops, the airplane weapon industry carries on the thorough transfor mation (to call it becoming an information based society), f inally causes them the product in the international military goods and in the goods for civilian use market the competit ive power greatly is the enhancement. But we in the informa tion technology transformation tradition industry aspect compar ed to the developed country to fall behind approximately for 20 years. Like in our country engine bed capacity, numerical control engine bed proportion (numerical control rate) to 199 5 only then 1.9%, but Japan has reached 20.8% in 1994, therefore every year has the massive mechanical and electrical products import. This also on from on macroscopic explained the engine bed numerical control transformation necessity. Tho rd, the numerical control transformation content and superiorl y lacks3.1 Transformation industry startingIn US, Japan and Germany and so on the developed countr y, their engine bed transforms took the new economical growt h profession, thrives abundantly, is occupying the golden age .As a result of the engine bed as well as the technical u nceasing progress, the engine bed transformation is "the eter nal" topic. Our country's engine bed transformation industry, also enters from the old profession to by the numerical c ontrol technology primarily new profession. In US, Japan, Ger many, have the broad market with the numerical control techn ological transformations engine bed and the production line, has formed the engine bed and the production line numerical control transformation new profession. In US, the engine be d transformation industry is called the engine bed regenerati on(Remanufacturing) industry. Is engaged in the regeneration ind ustry famous company to include: The Bertsche engineering fir m, the ayton engine bed company, Devlieg-Bullavd (are valuabl e) serves the group, the US equipment company and so on. T he American valuable company has set up the company in Chin a. In Japan, the engine bed transformation industry is calle d the engine bed to reequip (Retrofitting) industry. Is enga ged in the reequipment industry famous company to include: B ig indentation project group, hillock three mechanical companies, thousand substitute fields labor machine company, wild engineering firm, shore field engineering firm, mountain this engineering firm and so on. 3.2 Numerical control transformat ion contentThe engine bed and the production line numerical control transformation main content has following several points: First is extensively recovers the function, to the engine bed, the production line has the breakdown partially to carr y on the diagnosis and the restoration;Second is NC, the addend reveals the installment on the ordinary engine bed, or adds the numerical control system, transforms the NC engine bed, the CNC engine bed;Third is renovates, for increases the precision, the effi ciency and the automaticity, to the machinery, the electricit y partially carries on renovates, reassembles the processing to the machine part, extensively recovers the precision; Does not satisfy the production request to it the CNC system to carry on the renewal by newest CNC;Fourth is the technology renews or the technical innovati on, for enhances the performance or the scale, or in order to use the new craft, the new technology, carries on the b ig scale in the original foundation the technology to renew or the technical innovation, the great scope raises the leve l and the scale renewal transformation. The new electri cal system transforms after, how carries on the debugging as well as the determination reasonable approval standard, also is the technology preparatory work important link. The debugg ing work involves the machinery, the hydraulic pressure, the electricity, the control, and so on, therefore must carry onby the project person in charge, other personnel coordinate. The debugging step may conform to simplicity to numerous, fr om infancy to maturity, carries on from outside to in, afte r also may the partial overall situation, after first the s ubsystem the 3.3 The numerical control transformation superior ly lacks 3.3.1 reduced investment costs, the date of deliv ery are short With purchases the new engine bed to comp are, may save 60% ~ 80% expense generally, the transformatio n expense is low. Large-scale, the special engine bed especi ally is specially obvious. The common large-scale engine bed transforms, only spends the new engine bed purchase expense 1/3, the date of delivery is short. But some peculiar circu mstances, like the high speed main axle, the tray automatic switching unit manufacture and the installment too requires a lot of work, costs a great deal of money, often transforms the cost to enhance 2 ~ 3 times, with purchases the new engine bed to compare, only can economical invest about 50 %.3.3.2 machine capability stable are reliable, the structure i s limitedUses foundation and so on lathe bed, column all is heav y but the firm casting component, but is not that kind of welding component, after the transformation engine bed perform ance high, the quality is good, may take the new equipment continues to use many years. But receives the original mecha nism the limit, not suitably makes the unprecedented transfor mation. 3.3.3 familiar understood the equipment, is advantag eous for the operation serviceWhen purchases the new equipment, did not understand whether the new equipment can satisfy its processing request. Th e transformation then otherwise, may precisely calculate the engine bed the processing ability; Moreover, because many yea rs use, the operator already understood to the engine bed c haracteristic, uses and services the aspect to train the tim e in the operation short, effective is quick. The transforma tion engine bed as soon as installs, may realize the capaci ty load revolution. 3.3.4 may fully use the existing condi tionMay fully use the existing ground, does not need to lik e buys when the new equipment such to have reto construct the ground. 3.3.5 may use the newest control technology enhances the production equipment the automated level and the efficiency, improves the equipment quality and the scale, alters to the old engine bed now the horizontal engine bed. Fourth, numerical control system choiceWhen the numerical control system mainly has three kind of types, the transformation, should act according to the sp ecial details to carry on the choice.4.1 Step-by-steps the open system which the electrical ma chinery drivesThis system servo drive mainly is step-by-steps the elect rical machinery, the power step-by-steps the electrical machin ery, the battery solution pulse motor and so on. Entering s ends out which by the numerical control system for instructi on pulse, after the actuation electric circuit control and t he power enlargement, causes to step-by-step the electrical m achinery rotation, through gear vice- and ball bearing guide screw vice- actuation executive component. So long as the control command pulse quantity, the frequency as well as the circular telegram order, then may control the executive compo nent movement the displacement quantity, the speed and the h eading. This kind of system does not need the physical loca tion and the velocity feedback which obtains to the input e nd, therefore called it the open system, this system displac ement precision mainly decided in step-by-steps the electrical machinery angular displacement precision, transmission part and so on gear guide screw pitches the precision, therefore the system displacement precision is low.This system structure simple, debugging service convenient, work reliable, cost low, is easy to reequip successfully.4.2 The asynchronous motor or the direct current machine drive, diffraction grating survey feedback closed loop numer ical control system .This system and the open system difference is: Physical location feedback signal which by position detector set and so on the diffraction grating, induction synchromesh obtains, carries on the comparison as necessary with the given value, two interpolations enlargements and the transformation, the ac tuation implementing agency, by the speed which assigns turns towards the elimination deviation the direction movement, unti l assigns the position and the feedback physical location in terpolation is equal to the zero. The closed loop enters fo r the systemEnters for the system complex in the structure compared to the split-ring, the cost is also high, requests strictly to the environment room temperature. The design and the debu gging is all more difficult than the open system. But mayobtain compared to the split-ring enters for a system higher precision, quicker speed, actuation power bigger characteristic target. May act according to the product specification, decid ed whether uses this kind of system.4.3 The direct current servo electrical machinery drives, encoder feedback semi-closure link numerical control system .Half closed-loop system examination part installs in among passes in the moving parts, indirectly surveys the executive component the position. It only can compensate a system ring circuit interior part of part the error, therefore, its prec ision compared to closed-loop system precision low, but its structure and the debugging all compares the closed-loop syst em to be simple. In makes the angular displacement examinati on part and the speed examination part and the servo electr ical machinery time a whole then does not need to consider the position detector set installs the question.The current production numerical control system company fa ctory quite are many, overseas famous company like German SI EMENS Corporation,Japanese FANUC Corporation; Native corporation like China Mount Everest Corporation, Beijing astronautics eng ine bed numerical control system group company, Central China numerical control company and Shenyang upscale numerical contr ol country engineering research center.When choice numerical control system mainly is each kind of precision which the engine bed must achieve after the nu merical control transformation, actuates the electrical machine ry the power and user's request.Fifth in the numerical control transformation the mainmechanical part reequips the discussionA new numerical control engine bed, must achieve in the design that, Has the high static dynamic rigidity; Movement vice- between friction coefficient small, the transmission is ceaseless; The power is big; Is advantageous for the operati on and the service. When engine bed numerical control transf ormation should meet the above requirements as far as possib le. Cannot think the numerical control installment and the o rdinary engine bed connects in has met the numerical control engine bed requirements together, but also should carry on t he corresponding transformation to the major component to ena ble it to achieve the certain design request, can obtain th e anticipated transformation goal. 5.1 skids guide railSaid to the numerical control lathe that, the guide rail besides should have the conventional lathe guidance precision and the technology capability, but also must have good bears the friction, the attrition characteristic, and the reduction but sends the dead area because of the friction drag. At t he same time must have the enough rigidity, by reduces the guide rail to distort to processes the precision the influen ce, must have the reasonable guide rail protection and the lubrication.5.2 gearThe common engine bed gear mainly concentrates in the headstock and the gear box.In order to guarantee the transmission precision, on the numerical control engine bed uses the gear precision class i s all higher than the ordinary engine bed. Must be able to achieve the ceaseless transmissionin the structure, thus transforms time, the engine bed maingear must satisfy the numerical control engine bed the reque st, by guarantees the engine bed processing precision.5.3 skids the guide screw and the ball bearing guide screwThe guide screw transmission relates directly to the tran smission chain precision. The guide screw selects mainly is decided requests and drives the torque request in the job p recision. Is not used by job precision request Gao Shike skids the guide screw, but should inspect the original guide screw attrition situation, like the pitch error and the pitc h accumulative error as well as matches the nut gap. The o rdinary circumstances skid the guide screw to be supposed no t to be lower than 6 levels, the nut gap oversized then r eplaces the nut. Uses skids the guide screw relative ball b earing guide screw price to be low, but satisfies the pre cision high components processing with difficulty.The ball bearing guide screw rubs loses slightly, the ef ficiency is high, its transmission efficiency may above 90%; Precision high, the life is long; When start moment of forc e and movement the moment of force approaches, may reduce t he electrical machinery to start the moment of force. Theref ore may satisfiedly compare the high accuracy components proc essing request. 5.4 safe protectionThe effect must take the security as a premise. Transfor ms in the engine bed must take the corresponding measure ac cording to the actual situation, cuts noticeable. The ball b earing guide screw vice- is the precision part, when the wo rk must take strict precautions against the dust is speciall y the scrap and the hard sand grains enters the roller conveyer. On longitudinal guide screw also coca overall sheet i ron safety mask. The big carriage with skids two end surfac es which the guide rail contacts to have to seal, prevented absolutely the flinty granulated foreign matter enters the sl iding surface damage guide rail.Sixth, After the engine bed electrical system transformati on, to operates, the programmers inevitably brings the new r equest. Therefore ahead of time carries on new system knowle dge training to the operator and the programmers to be extr emely important, after otherwise will affect the transformatio n the engine bed rapid investment production. The training c ontent should include the new operation kneading board dispos ition, the function, the instruction meaning generally; New s ystem functional scope, application method and with old syste m difference; Maintenance maintenance request; Programming stan dard and automated programming and so on. The key point is makes, gets a good grasp of the operating manual and the p rogramming instruction booklet.the numerical control transforms se Transforms the scope according to each equipment differently, must beforehand desig n the connection partial transformations, if transforms comple tely, should design the electro-mechanical transformation conne ction, the operation kneading board control and the dispositi on, the interconnection partial contacts, the parameter measur ing point, services the position and so on, the request ope rates and services conveniently, reasonable, the line moves t owards, center the small junction smoothly few, the strong a nd the weak electrical noise is smallest, has the suitable allowance and so on. Partial transformation, but also needsto consider the new old system the performance match, the v oltage polarity and the size transformation, install the posi tion, the digital-analog conversion and so on, when the nece ssity must manufacture the transformation connection voluntaril y.veral examples1st, transforms the X53 milling machine with SIEMENS 810MIn 1998, the company invested 200,000 Yuan, with German Simens the 810M numerical control system, the 611A exchange servo drive system sds was the X53 milling machine carries on X, Y, the Z three axle numerical control transformation to a company's model; Retained the original main axle system and the cooling system; The transformation three axle has us ed the roller lead screw and the gear drive organization on the machinery. The entire transformation work including the m achine design, the electrical design, the PLC procedure estab lishment and the debugging, the engine bed overhaul, finally is the entire machine installment and the debugging. After t he milling machine transforms, processing effective stroke X/Y /The Z axis respectively is 88.0/270/28 billion mm; Maximum speed X/Y/The Z axis respectively is 5000/1500/800 mm/Min; Ma nual speed X/Y/The Z axis respectively is 3000/1000/500 mm/Mi n; The engine bed processing precision achieves ±0.001mm. The engine bed three coordinates linkage may complete each kind of complex curve or the curved surface processi ng.2nd, transforms the C6140 lathe with GSK980T and the exc hange servo drive system sds .In 2000, with Guangzhou numerical control plant production GSK980T numerical control system, the DA98 exchange servo uni t and 4 locations automatic tool rests to an electrical mac hinery branch factory C6140 lathe X, the Z two axes carries on the numerical control transformation; Retained the original main axle system and the cooling system; The transformation two axes have used the roller lead screw and with the ambu lacrum transmission system on the machinery. Entire transforma tion work including machine design, electrical design, engine bed overhaul and entire machine installment and debugging. Af ter the lathe transforms, processing effective stroke X/The Z axis respectively is 3.90/73 million mm; Maximum speed X/The Z axis respectively is 120.0/3 million mm/Min; The manual sp eed is 400mm/Min; Manual is fast is X/The Z axis respective ly is 120.0/3 million mm/Min; The engine bed smallest migrat ion unit is 0.001mm.3rd, transforms the X53 milling machine with SIEMENS 802SIn 2000, the company invests 120,000 Yuan, with German S imens the 802S numerical control system, step-by-steps the ac tuation system is the X53 milling machine carries on X, Y, the Z three axle numerical control transformation to company' s another model; Retained the original main axle system and the cooling system; The transformation three axle has used t he roller lead screw and the gear drive organization on the machinery. The entire transformation work including the machin e design, the electrical design, the engine bed overhaul, fi nally is the entire machine installment and the debugging. A fter the milling machine transforms, processing effective stro。
数控机床设备资料中英文对照
数控机床设备资料中英文对照数控机床设备资料中英文对照一：说明书名次解释：lubrication hole[机]润滑孔; [机]滑油孔; 加油孔; [机]注润滑油孔Pressure Lubrication[机]压力润滑; 强制润滑; [机]加压润滑lubrication device润滑装置; 润滑油; 润滑装配AUTO LUBE 自动润滑Spindle motor 主轴马达Hydraulic pump motor 油压马达Auto Cross feed motor 前后马达High Pressure Through Coolant刀具高压冷却系统once-through coolant system一次流过冷却系统Coolant through spindle油水分离机sp. through coolant主轴通过冷却液through coolant通过冷却剂coolant jet冷却剂喷嘴flood coolant motor洪水冷却电机base coolant/gun motor基地冷却剂/枪电动机mist collect motor雾收集电动机Coolant motor (for tools/chips) 切削水马达Chip conveyor motor 铁屑输送机马达ATC motor 储刀仓马达fan cooler风扇冷却器fan draught cooler冷风机fan cooler(for amp):风扇冷却器（对放大器（amplifier））containment fan cooler安全壳风机冷却器fan-draught cooler风扇冷却器fan unit 风扇设备风扇单元风扇装置panel cooling 嵌入式降温panel door 镶板门panel heating 板壁供热tool counter工具柜台MAGAZINE CW 刀库正转MAGAZINE CCW 刀库反转 ...COUNTER （计数器）TOTAL COUNTER（总计数器）Mate：配对物（伴侣）Rotation：旋转回转Caution：谨慎radiator brake：散热器制动air duster blow gun吹尘器喷枪air-blow pipe喷气管Air Blow：鼓风Overload：超载overload protection防止过载，超载防护information overload信息过载；信息超载；信息超负荷overload capacity过载容量overload operation超负荷运行，超载运行thermal overload relay热继电器；热过载继电器overload current[电]过载电流 ; 过载电流过负荷电流dis connect jumper pin in case of using sub op存保计划连接跳线针如果使用子运算（in case of using如果使用；usb op 子运算）disconnect jumper pin断开连接跳线针beta-i servo ：β-i 伺服spindle amplifer:主轴放大器manual feed delay：手动进给延迟rigid tapping ontime：刚性攻丝准时z-axis cancel：z轴取消Current Tool Number现行刀具号Reset Current Tool恢复当前工具预设servo amp module伺服放大器模块optical fiber cable：光缆、光纤光缆sheet key板键Head sheet Key头型图要点key sheet键盘纸; 转印盘纸i series servo motor：i系列伺服电动机call light：警示灯lub. motor on :润滑泵接通（lubricant润滑剂motor-on signal马达接通信号ATC forward：ATC 向前ATC reverse ：ATC反向Ball screw: 滚珠丝杠Binary code :二进制DETACH:分离，脱开Follow-up ：位置跟踪Black format：程序段格式Tool post interference check：刀架碰撞检查Abnormal load detection：异常负载检测Manual handle interruption:手轮中断Ladder diagram:梯形图（阶梯，关系图）Tool counter：工具柜台Magazine：刀库Brake module：制动模块Machine side：机侧Twist pair：双绞线Main power source：主电源Wiring diagram：接线图Current：现时状态、现行状态Dual table ：双工作台Spare：备用件、预置Aux：辅助Brake on：制动器Mist ：雾状、雾Coolant tank capacity：冷却泵油箱容量Enclosure：外壳、套、附件Overload：过载Flag：标志Condition：条件Machine ready delay：机床准备延迟Encoder：编码器Etherent：以太网口Orientation：主轴定向Spindle positioning：主轴定位Fault：故障Motion：运转Dwell：停歇，保压Feed rate：进给率Interlock/start-lock:互锁/启动-锁Spindle speed arrival check：主轴速度到达检测concent for maintenance答应为维护AC reactor:交流电抗器APC：绝对位置编码器反馈(Absolute position encoder feedback)arm in position z-axis interlock:手臂位置Z轴互锁Pressure：压力，压强，是……压迫Pressure valve[机]压力阀; [机]压力值; 止回阀; [机]回压阀air pressure气压; 空气压力; [建]工作气压; [物]气源压力consuming volume耗用量Oil：油Oller：n. 轮胎式压路机Capacity: n. 能力；容量；资格，地位；生产力bearing capacity[力]承载能力; [力]承载力; [力]承重能力; 支持力oil type 油的类型pumping n. [机] 抽吸；脉动；抽气效应v. 抽水（pump的ing形式）pumping out抽空; 扬水; 排出; 泵出pumping frequency[电子]泵频; 抽运频率; 泵送频率interval：间隔间距class interval[统计]组距; 组区间; 级距; 标度分组间隔Time interval[天]时间间隔; [天]时间区间; 时距; [天]时段interval scale[统计]区间尺度; 等距量表; [计]等距尺度; 等距量尺capacity：容量consuming：adj. 消费的；强烈的v. 消耗（consume的ing形式distributor分配器metering n. 计量，[测] 测量；测光模式v. 以计量器计量（meter 的ing形式metering valve[机]计量阀; 限流阀; [机]限量阀; [机]配量阀metering jet量孔; [油气]测油孔; 计量喷流OPTION：选择（选择功能块）ARM:机械手ARM home position：机械手原点位置soft key cable：软键电缆PUNCH PANEL:开孔面板MOTHER BOARD:母版Name：名称Description：描述Connector：连接器二、操作面板中英文对照：ABS和REL——在法那克系统中，按这两个键分别来切换当前机床的相对坐标和绝对坐标ALL——全选，程序编辑时用PRGRM——程序（program）的缩写，用于查看程序NEXT——查看程序和查看参数时，下一页OPRT——在法那克系统中，选择编辑程序时，也就是按下PRGRM后，再按这个键，才能输入程序号HOST，CONECT——这两个是在系统与外界通信时用的，我没试过，不知道什么作用HELP——查看帮助信息SHIFT——换档键，有些键有两个字符，按下这个键，用来输入顶部那个字符ALTER——程序修改键，编辑程序时用INSERT——程序插入键，编辑程序时用EOB——程序结束符，在编辑程序时，没段程序结束时，要加这个符号CAN——取消键，用来取消输入INPUT——输入键，用来输入程序或参数POS——按此键显示当前机床位置画面PROS——按此键显示当前程序画面OFFSET——按此键显示刀具偏置画面SETTING——按此键显示刀具偏置设定画面SYSTEM——按此键显示系统信息及系统状态画面GRAPH——按此键显示加工时刀具轨迹的图形画面CUSTOM——按此键显示用户宏程序画面手动数据输入(MDI)直接数字控制方法(DNC)控制器单元或机控制器单元（MCU）法拉克：ALTER 修改程序及代码INSRT 插入程序DELET 删除程序EOB 完成一句(END OF BLOCK)CAN 取消(EDIT 或MDI MODE 情况下使用)INPUT 输入程序及代码OUTPUT START 输出程序及指令OFFSET 储存刀具长度、半径补当值AUX GRAPH 显示图形PRGRM 显示程序内容ALARM 显示发生警报内容或代码POS 显示坐标DGONS PARAM 显示自我诊断及参数功能RESET 返回停止CURSOR 光标上下移动PAGE 上下翻页三、常用缩写：启动start STRT停止stop ST运行run正转forward FWD反转reverse REV加速accelerate减速reduce RED低速low L中速medium M高速high H主轴方向spindle direction向前forward FWD向后backward向左left L向右 right R诊断：DGNOS信息：MSG操作员：OPER参数：PARAM目录：DIR取代：ALTER公共地线，公共线：COM四、其它常用词句中英文对照：金属切削 metal cutting机床 machine tool金属工艺学 technology of metals 刀具 cutter 摩擦 friction联结 link传动 drive/transmission轴 shaft弹性 elasticity频率特性 frequency characteristic 误差 error 响应 response定位 allocation机床夹具 jig动力学 dynamic运动学 kinematic静力学 static分析力学 analyse mechanics拉伸 pulling压缩 hitting剪切 shear扭转 twist弯曲应力 bending stress强度 intensity三相交流电 three-phase AC磁路 magnetic circles变压器 transformer异步电动机 asynchronous motor几何形状 geometrical精度 precision正弦形的 sinusoid交流电路 AC circuit机械加工余量 machining allowance 变形力 deforming force 变形 deformation应力 stress硬度 rigidity热处理 heat treatment退火 anneal正火 normalizing脱碳 decarburization渗碳 carburization电路 circuit半导体元件 semiconductor element 反馈 feedback发生器 generator直流电源 DC electrical source门电路 gate circuit逻辑代数 logic algebra外圆磨削 external grinding内圆磨削 internal grinding平面磨削 plane grinding变速箱 gearbox离合器 clutch绞孔 fraising绞刀 reamer螺纹加工 thread processing螺钉 screw铣削 mill铣刀 milling cutter功率 power工件 workpiece齿轮加工 gear mechining齿轮 gear主运动 main movement主运动方向 direction of main movement进给方向 direction of feed进给运动 feed movement合成进给运动 resultant movement of feed合成切削运动 resultant movement of cutting合成切削运动方向 direction of resultant movement of cutting 切削深度 cutting depth前刀面 rake face刀尖 nose of tool前角 rake angle后角 clearance angle龙门刨削 planing主轴 spindle主轴箱 headstock卡盘 chuck加工中心 machining center车刀 lathe tool车床 lathe钻削镗削 bore车削 turning磨床 grinder基准 benchmark钳工 locksmith锻 forge压模 stamping焊 weld拉床 broaching machine拉孔 broaching装配 assembling铸造 found流体动力学 fluid dynamics流体力学 fluid mechanics加工 machining液压 hydraulic pressure切线 tangent机电一体化 mechanotronics mechanical-electrical integration 气压 air pressure pneumatic pressure稳定性 stability介质 medium液压驱动泵 fluid clutch液压泵 hydraulic pump阀门 valve失效 invalidation强度 intensity载荷 load应力 stress安全系数 safty factor可靠性 reliability螺纹 thread螺旋 helix键 spline销 pin滚动轴承 rolling bearing滑动轴承 sliding bearing弹簧 spring制动器 arrester brake十字结联轴节 crosshead联轴器 coupling链 chain皮带 strap精加工 finish machining粗加工 rough machining变速箱体 gearbox casing腐蚀 rust氧化 oxidation磨损 wear耐用度 durability随机信号 random signal离散信号 discrete signal超声传感器 ultrasonic sensor集成电路 integrate circuit挡板 orifice plate残余应力 residual stress套筒 sleeve扭力 torsion冷加工 cold machining电动机 electromotor汽缸 cylinder过盈配合 interference fit热加工 hotwork摄像头 CCD camera倒角 rounding chamfer优化设计 optimal design工业造型设计industrial moulding design 有限元finiteelement滚齿 hobbing插齿 gear shaping伺服电机 actuating motor铣床 milling machine钻床 drill machine镗床 boring machine步进电机 stepper motor丝杠 screw rod导轨 lead rail组件 subassembly可编程序逻辑控制器 Programmable Logic Controller PLC 电火花加工 electric spark machining电火花线切割加工electrical discharge wire - cutting 相图phase diagram热处理 heat treatment固态相变 solid state phase changes有色金属 nonferrous metal陶瓷 ceramics合成纤维 synthetic fibre电化学腐蚀 electrochemical corrosion车架 automotive chassis悬架 suspension转向器 redirector变速器 speed changer板料冲压 sheet metal parts孔加工 spot facing machining车间 workshop工程技术人员 engineer气动夹紧 pneuma lock数学模型 mathematical model画法几何 descriptive geometry机械制图 Mechanical drawing投影 projection视图 view剖视图 profile chart标准件 standard component零件图 part drawing装配图 assembly drawing尺寸标注 size marking技术要求 technical requirements刚度 rigidity内力 internal force位移 displacement截面 section疲劳极限 fatigue limit断裂 fracture塑性变形 plastic distortion脆性材料 brittleness material刚度准则 rigidity criterion垫圈 washer垫片 spacer直齿圆柱齿轮 straight toothed spur gear 斜齿圆柱齿轮 helical-spur gear直齿锥齿轮 straight bevel gear运动简图 kinematic sketch齿轮齿条 pinion and rack蜗杆蜗轮 worm and worm gear虚约束 passive constraint曲柄 crank摇杆 racker凸轮 cams共轭曲线 conjugate curve范成法 generation method定义域 definitional domain值域 range导数\\\\微分 differential coefficient求导 derivation定积分 definite integral不定积分 indefinite integral曲率 curvature偏微分 partial differential毛坯 rough游标卡尺 slide caliper千分尺 micrometer calipers攻丝 tap二阶行列式 second order determinant逆矩阵 inverse matrix线性方程组 linear equations概率 probability随机变量 random variable排列组合 permutation and combination气体状态方程 equation of state of gas 动能 kinetic energy势能 potential energy机械能守恒conservation of mechanical energy 动量momentum桁架 truss轴线 axes余子式 cofactor逻辑电路 logic circuit触发器 flip-flop脉冲波形 pulse shape数模 digital analogy液压传动机构 fluid drive mechanism 机械零件 mechanical parts淬火冷却 quench淬火 hardening回火 tempering调质 hardening and tempering磨粒 abrasive grain结合剂 bonding agent砂轮 grinding wheel。
机械类数控车床外文翻译外文文献英文文献数控
数控加工中心技术开展趋势及对策原文来源：Zhao Chang-ming Liu Wang-ju (CNC Machining Process and equipment, 2002,China)一、摘要Equip the engineering level, level of determining the whole national economy of the modernized degree and modernized degree of industry, numerical control technology is it develop new developing new high-tech industry and most advanced industry to equip (such as information technology and his industry, biotechnology and his industry, aviation, spaceflight, etc. national defense industry) last technology and getting more basic most equipment. Numerical control technology is the technology controlled to mechanical movement and working course with digital information, integrated products of electromechanics that the numerical control equipment is the new technology represented by numerical control technology forms to the manufacture industry of the tradition and infiltration of the new developing manufacturing industry,Keywords:Numerical ControlTechnology, E quipment,industry二、译文数控技术和装备开展趋势及对策装备工业的技术水平和现代化程度决定着整个国民经济的水平和现代化程度，数控技术及装备是开展新兴高新技术产业和尖端工业〔如信息技术及其产业、生物技术及其产业、航空、航天等国防工业产业〕的使能技术和最根本的装备。
回转工作台设计外文翻译文献
回转工作台设计外文翻译文献(文档含中英文对照即英文原文和中文翻译)原文：Design and research direction of the rotary table Abstract：this paper introduces the basic content and the principle of the rotary table design, put forward the research direction of the rotary table, broaden the design idea of designer.Improve the efficiency of the rotary table design, shorten the development cycle of new type rotary table, through the study of this article is for the quality of products of pre-assessment, determine the scope of the production and processing of precision index provides an important basis.Keywords：rotary table；design and research；new ideas；developments0IntroductionOn April 11 to 16, 2011, the theme of "science and technology innovation to meet the crisis generation" of the 12th China international machine tool exhibition (CIMT2011) was held in Beijing. In an economic crisis haze dissipating, slow recovery under the background of international economy, China's economy healthy and rapid development pattern, is attracting more and more attention. In this exhibition, the knowledge of machine tools, tools, manufacturing enterprises at home and abroad Gather in Beijing, as the economic crisis after the baptism of machinery industry brought a feast full of imagination and creativity of science and technology. Is the exhibition of machine tool accessories exhibition In terms of product, high efficiency, high precision, high reliability, high life still is to develop the theme of pursuit. As for the machine tool accessories rotary table is no exception. Rotary table is divided into indexing table, and rotary table. Indexing table can only be completed dividing movement, there is no function of feed. Can be used with work as a whole, can also be used alone. Common positioning pin and rat tooth plate; Nc rotary table is the ideal matching accessories of all kinds of CNC milling machine and machining center. Turn back to the table design Process includeThe basic types of rotary table s not only the mechanical drive mechanism, and it also involves the mechanical and electrical control system, the design idea of the two parts as the demand of the market and customers, constantly update and perfect, therefore, the design and research direction of the rotary table directly affect the benefit and the rise and fall of theturntable production enterprises.1 The basic types of rotary table1.1General turntableRotary table is boring machine, drilling machine, milling machine and the slotting machine, and other important accessories, used for processing and there is a requirement for dividing hole, slot and slope, turn the workbench when processing, can be processing arc surface and groove, etc. According to the structure is divided into different levels turntable general turntable, lie the turntable and universal turntable.(1) water flat turntable: on the frustum of a cone with central hole workpiece positioning and clamping with T slots. Mesa engraved with 360 °on the outer periphery of uniform scribed line. Mesa between base and a worm pole - worm gear pair, ratio of 90:1 or 120:1, to drive and dividing, worm out from base with dial and segment at the end of the handwheel. Turn the handwheel to drive mesa, and the mesa cylindrical week scale (in degrees) and subdivision dial readout rotation Angle. Dividing accuracy is commonly + 60 ". Levels turntable worm out side can also be used coupling connected to machine transmission device, in order to realize the dynamic drive.(2) lie turntable, the base has two perpendicular installation base, make mesa can be level Also can be vertically.(3) the universal turret: mesa can be within the scope of 0 ° ~ 90 ° inclined at any Angle, make the workpiece at any Angle of space can be accurately adjusted.1.2 precision turntablePrecision turntable Used for processing or Angle measurement on precision machine tools. Common optical turntable, digital display turntable and super precision contrate gear plate of turntable.Optical rotary table: (1) on the spindle is equipped with glass or metal precision dial, the optical system to subdivide scale, amplification, through the eyepiece or screen Angle value.(2) digital turntable: mounted on the turntable spindle precision circular grating or round inductosyn and display unit by the number of words the Angle value. Theabove two precision turntable dividing precision up to + / - 1 ".(3) the ultra-precision end tooth disc turntable: use a pair of precision of research on 1440, 720 or 360 tooth face tooth disc dividing positioning, the indexing accuracy up to + / - 0.01 ", make a precise Angle measurement.2 The design parameters and the working principle of rotary tableRotary table design parameters include: rotary table, table size, total table high degree, bearing table, feed speed, turning back to speed range, fast speed rotary speed, electric power, rotary table, dividing precision and measurement system, etc. This study is based on mechanism of shaanxi institute of technology laboratory of general rotary work Stage, through to tear open outfit, clear the turntable within the department of mechanical transmission mechanism, it is a mesa, pedestal, worm gear, worm, positioning3 Rotary table of research ideas and methodsRotary precision of the rotary table is a main technical bottlenecks, if technology and breakthrough in the continent before it has problems, design and manufacture of our country turntable will by "manufacturing power" to "manufacturing power" transformation of a major step forward.3.1 mechanical partsMainly the mesa rotary table with body contact structure design and optimization, generally adopts the sliding and rolling two ways; Second worm and worm wheel design and optimization. In short, the mechanical design involves the various parts of the turntable and parts of process structure, mechanical properties and movement characteristics, etc. Our basic CAD/CAM/CAE technique was used to realize, such as using Pro/E5.0, SolidWorks, CAXA three-dimensional parameterized modeling software to a part of the rotary table zero structure simulation design and research; By using Pro/E5.0, MasterCAMX to make the simulation of machining parts and nc code generation, etc.; Using ANASYS parts for various parts for the turntable mechanical performance analysis, further optimize the structure of the process.3.2 control partTurntable control system design is also a key technical problems, implementation approach are: PLC control system, single-chip microcomputer control system andindustrial control system, three categories. Turn our manufacturing control system in the manual, mechanical and electrical automation, digital control stage of development, is climb the new peak, are at a higher level of information control intelligent direction development. Intelligent machine research and development and extensive application, will promote the rapid, healthy and sustainable development of turntable industry in China, and lead a profound change in the future manufacturing, turn back to the workbench products with new image and concept to attract the customers is the focus of every enterprise instead.3.3 rotary table of green manufacturing design and manufacture of rotary table should also adopt a variety of energy conservation and emissions reduction technology, to the userAnd advocating the meaning of low carbon and green manufacturing way. Traditional thinking and the change of production pattern is experiencing a deep carved, more and more machine tool accessories manufacturing enterprises have to shoulder social morality and responsibility given by the low carbon way, step into the governance and development of the road of scientific development, a green industry Revolution is here is machine tool industry rise. Through technical innovation, process optimization, reduce material and oil-water separation automatic recovery, dust collection and recycling, self-lubricating material application, such as less oil lubrication technology measures to reduce emissions, reduce the impact on the environment.4 ConclusionThe equipment manufacturing industry is the cornerstone of a country's industry, it is a new technology, the development of new products, and provided an important means of modern industrial production, is an indispensable strategic industries.Even the developed industrialized countries, also attaches great importance to.Mechanical, electrical and data processing system and the combination of numerical control technology, leading the new production and processing.In 2011, is China's first year of "twelfth five-year" plan. "Twelve five" period, I have to to the national economy in various fields to carry out the scientific outlook on development as the theme, to speed up the transformation of the mode of economic development as the main line,in-depth technical innovation and development mode change. Rotary table no longer so "machinery", become more and more" Bright", let us together look forward to the birth of intelligent rotary work table!Reference[1] Cui Xufang, zhou, the principle of nc rotary table and design [J], brick and tile, 2008, NO. 6:23-27;[2] Zhao Qun, processing center of rotary table parts structure analysis [J], equipment design and maintenance, 2002, NO. 5:35-36;[3] Yang jian, Liu Hu, dividing the experience of using rotary table [J], machinery manufacturing, 1998, NO. But - 6;[4] Yang Chunhua, Xu Yaokun, general improvement of rotary table [J], motorcycle technology, 2003, NO. So - 27;[5] Sun Dezhou, double wedge ring - a new type of rotary table ball positioning [J], technology and equipment, 2005, NO. 4:8 2-84;[6] JiaoZhiXian Gu Ruihua, rotary table index [J], for the improvement of mechanical technicians, 1995, NO. I - 23.[7] Yang Huizhong, large rotary table in the installation and debugging of error separation and compensation technology research [J], machinery, VOL32, NO. Did - 24;[8] PangZhiWei, CNC boring machine adjustment [J] rotary table maintenance, equipment management and maintenance, 2007, NO. 59 3:59 -;[9]Chen Jiangang, the rotary table control system based on programmable controller design [J], machinery manufacturing, 2008 46-48 (1) : 36 to 39.[10] De Garmo EP, Black JT. Material and manufacturing process. Prentice - Hall, New York, 1957[11] Shigley JE. Mechanical engineering design. McGraw Hill, New York, 1986[12] the knowledge of the five-axis linkage CNC machine tools, machine 66 navigation network, 2007-12-28;[13] five-axis linkage CNC machine tools for die &mold the significance of (a), good mechanical and electrical network, the 2007-12-05;[14]Hwang,JiSeon,PhD.Five-axisNCmachiningofcompoundsculpturedsurfaces[M].P URDUEUNIVERSITY,1997.译文：回转工作台的设计与研究方向摘要：本文主要介绍了回转工作台设计的基本内容和思路，提出了回转工作台的研究方向，拓宽了设计人员的设计思路。
数控机床外文翻译----刀具和刀夹
数控机床外文翻译----刀具和刀夹CUTTING TOOLS AND TOOLHOLDERSTo machine a workpiece successfully you must have :1.the correct kind of cutting tool or tool bit2.the right type of toolholder3.a tool with a sharp cutting-edge4.the cutting tool set or adjusted to the correct height and position.Cutting-tool materialsTool bits used on the lathe are made form one of six basic materials:water-hardening steels,high-speed steels,hard-cast,nonferrous alloys,sintered (cemented) carbides,ceramics,and diamonds. The selection of the material used depends upon many factors including:tool cost,size and design oftool ,metal-removal rate ,length of run ,finish and tolerance of part,and condition and capability of the machine tool . Because of these factors ,material selection is more often based on general experience than on precise evaluation . There are, however ,certain general characteristics of the different cutting-tool materials you should understand.Water-hardening Steels.These include the high-carbon tool steels (either plain carbon or those with minor additions of chromium , vanadium,or tungsten) .The different grades of water-hardening tool steels are classed as W steels in American Iron and Steel Institute’s system of classification . Tools made from these materials have very sharp ,smooth cutting-edges when properlyheat-treated. They are adequate for limited turning at arelatively low cutting speed or when old ,low-speed equipment ,such as a flat-belt lathe , is used .The main limitation of tools made form water-hardening steels is that they soften if the cutting-edge temperature exceeds approximately 300-400F during sharpening or cutting .A second disadvantage is low resistance to edge wear . High-speed Steels. High-speed steels offer great improvement in cutting efficiency over water-hardening tool steels .Tools made from high-speed steels retain enough hardness to machine at rapid rates even when the tool temperature reaches 1050F . They can be used even though they become dull red with heat . Upon cooling to room temperature , the original hardness of these steels does not change .Wear resistance of high-speed steels is much better than that of the carbon or alloy steels . This is due to the high carbide content ,especially in thehigher-alloy types of high-speed steel . Fully hardened , high-speed steels have greater resistance to shock than carbides or hard-cast alloys .There are two main types of high-speed steels designated in the American Iron and Steels Institute system , M steels (molybdenum base and T steels tungsten base . Tool bits made from these materials can be purchased already ground to various shapes . Unground tool bits called tool-bit blanks can also be purchased . These tool-bit blanks are made in standard size to fit the commonly used lathes . The common sizes are 3/16in square by 1 in long ,1/4in square by 2inlong ,5/16in square by 2-1/2in long ,and 3/8in square by 3in long . High-speedsteel tool bits are the type most used in the school machineshop .Hard-cast Alloy . These materials do not contain sufficient iron to be classed as steels . Rather , they are mainly alloys of cobalt , chromium , and tungsten with other elements added for special purpose . They reach full hardness in the as-cast condition , without heat treatment . The must be ground to size after casting . In terms of resistance to heat , wear ,shock ,and initial cost , cast alloys rank between high-speed steels and carbides .Hard-cast alloys are weaker in tension and more brittle than high-speed steels and thus are not suitable for severe shock loads . They are known by such commercial names as stellite , Rex alloy ,and tantung .Sintered Carbides . For efficient and high-speed machining ,best results can be obtained with sintered carbide tools . Carbide tools are available in solid form and as inserts which are either brazed or clamped in toolholders . Clamped inserts are usually round , square , or triangular in shape and have all edge is always available . These inserts can be rotated so that a sharp edge is always available . With modern machine tools and the proper grade of cemented carbide , it is possible to use cutting speeds 10 to 30 time faster than those feasible with high-speed steels .Carbides are suitable for most machining operations such as single-point turning , drilling ,milling , thread cutting, and reaming . Carbides should be used only when they can be supported rigidly and when the machine tool has adequate power and speed to enable their efficient use .Ceramic . With the exception of industrial diamonds , ceramic inserts are the hardest and strongest inserts available . They resistabrasive wear , chipping , and breakage . These inserts work best on very rigid machine tools and onwell-supported workpieces . For most operations , cutting fluids are not needed . Diamonds . Industrial diamonds that have either circular or facetedcutting-edges are used for light finishing cuts when an extremely high-quality surface finish required . Although a very smooth finish can be achieved using other cutting-tool materials , diamond turning can provide even smoother finishes with very small tolerances .TOOLHOLDERSThe toolholder holds the cutting tool rigid during cutting operations . Four types of toolholders are in general use .1 . The tool post with standard toolholders . The tool too post is comprised of the post , screw , washer , collar , and rocker . The washer fits the top slidee piece slot . The collar and the rocker elevate or lower the point of too . The screw clamps the toolholder in place .The standard toolholder for high-speed steel cutter bits comes in three common shapes : straight , right-hand offset or shank , and left-hand offset or shank . You can identify right-hand and left-hand offset holders by holding the setscrew end in your hand . If the shank bends to the right , it is a left-hand offset holder . The straight toolholder is fused for most work . The left-hand toolholder is used when you need to cut close to the chuck or lathe dog . The right-hand holder isused when feeding toward the tailstock of the lathe . The cutting-tool bit is held in each of these toolholders at an angle of 14 to 16.5 degrees . This is called the toolholder angle .Carbide toolholders also come in three styles and are similarin appearance to those mentioned above . The hole for the cutter bit , however , is parallel to the bottom edge of the holder .2. The open-side or heavy-duty tool block holds one tool ata time and consists of a T-slot clamp , a C-shaped block , and two or more tool clamping screws . Because this unit is very rigid , it is especially useful for heavy cuts . A tool bit can be mounted directly in the tool block or some type of carbide tooolholder can be used .3. The turret tool block or four-way toolholder consists of a swiveling block in which the tools are clamped Common turret block hold four tools . Each can be quickly swiveled into cutting position and clamped in place . Some turret blocks have eight tool stations . Frequently ,an open-side-type tool block is also mounted on the rear of the cross slide to add one additional cutting operation . With this arrangement , anywhere form five to nine different kinds of tools can be mounted and operated in sequence for turning , forming ,facing ,knurling , and cutting off duplicate parts .4. The quick-change-type tool system holds only one tool ata time , but three different sides can be used to position the tool . It consists of a quick-change tool post with a clamping lever and a series of toolholders for turning , facing ,boring , cutting off , threading , knurling , and thread cutting .Single-point Cutting ToolsTool Parts . Before you can grind a tool bit , you must become acquainted with some of the terms used to describe the various parts of the cutting tool .1 . The face is the top of the tool bit . It is the surface on which a part of the chip attaches as it is cut away form the workpiece .2. The cutting-edge is that part of the cutter bit which actually does the cutting .3. The nose is the corner or are formed by the side and end cutting-edge .4. The flank is the surface below the cutting-edge .5. The point is the part of the tool bit which is shaped to form the cutting-edge and face .Tool Angles .The following are important tool angles used for all single-point cutting tools .1.The side relief angle is the angle between the ground surface and the verticalside of the tool bit before it is ground . This angle was formerly called side clearance , and many machinists still use this term .The side relief angleprovides clearance between the cut surface of the work and the flank of tool .Tool wear reduces the effective side clearance angle .If the angle is too small, the cutter will rub and heat . If the angle is too large , the cutting-edge will be weak and the tool will have a tendency to dig into the workpiece.2.The end relief angle is the angle formed between the end of the cutting-edgeand a vertical line. It was formerly called front clearance. The end reliefangle provides clearance between the finished surface of the work and the tool. If this angle is too small, the tool will rub on the finished surface and produce a poor finish. Wear tends to reduce this angle. If the angle is too large , the tool may dig into the work , chatter, and fail through chipping . An angle of 8 to 15 is recommened for steel tools and 6 to 8 for carbide tools .If thetool is set above the center of rotation , the effective clearance angle is reduce . This must be considered in choosing the proper angle .3.The end cutting-edge angle provides clearance between the cutter and thefinished surface of the work .If this angle is too small, it may cause chatter. A small angle of about 6 is desirable on light finishing cuts, however, in order to produce a smooth finish .4.The side cutting-edge angle turns the chip away form the finishedsurface .Recommended angles are between 5 and 15 .5.The nose radius removes the fragile corner of the tool , prolongs tool life ,and improves finish . The radius may be large for maximum-strengthrough-cutting tools and may be reduced for light feeds . The larger the nose radius ,the better the finish as long as chatter dose not occur .Recommended nose radii are 0.010 to 0.030 in . or more for finishing cuts , and 1/30 to 1/2 in for roughing cuts .6.To help shape the cutting-edge and face , it is necessary to grind rake angleson a tool bit .Rake is an inclination form the vertical or horizontal .The two rake angles are back rake and side rake .Back rake , in a single-point feeding to the side , turns the chip away form the finished work and gives the tool a slicing action .A zero back rack tends to make a spiral chip , and a back rake angle greater than zero tends to stretch the spiral chip out into a helix . A back-rake angle of form 5 to 15 is used to keep chips form scratching the workpiece . High-speed steel tool bits are always ground with a positive rake .However , cementedcarbide tools may have either a positive or negative rake .Negative rake increases the shear angle at which the chip is formed , providing for a good chip and a good surface finish .Negative rake tools are generally used on a heavy-duty lathe that is operated at high speed with a heavy feed .Side rake refers to the angle between the face of the tool and a line that would represent the top of the unground tool bit as viewed form the end . Side rake controls the type of chip produced during machining as well as the direction in which the chip will travel .A tool with a small side-rake angle will produce shorter chips than one with a large rake angle .7 .The nose angle is the angle between the side-cutting edge and the end-cutting edge .Classes of Single-point T oolsDifferent shapes of tool bits are needed to do certain machining operations . Most tool bits are ground to cut in one direction only .The two common types are referred to as right cut and left cut .These were formerly called right-hand and left-hand tool bits .A right-cut single-point tool is one that , when viewed form the point end with the face up , has its cutting-edge on the right side .When the tool bits is placed in the lathe , the cutting-edge is on the left side .This tool bit cuts form the right to the left , or form the tailstock end toward the headstock of the lathe .A left-cut tool bit has the cutting-edge on the left when viewed form the point end with the face up . This tool bit is ground to cut form the left to the right or toward the tailstock of the lathe .Commonly used types of tool bits include the following:1.A roughing tool is a tool bit designed to take heavyroughing cuts to reducethe diameter of a workpiece to approximate size . Because finish is notimportant when roughing work , such a tool bit may be ground to almost a sharp point . However , the point is usually rounded very slightly to prevent its breaking down .2.A finishing tool is one that has a keenly ground cutting-edge which may behoned with an oilstone to produce a very smooth finish ,A finish toolgenerally has a larger rounded nose than a roughing tool .3.A roundnose cutting tool is a general-purpose tool used for many types ofwork .When ground flat on the top , it can be used for both right and left cuts and for turning brass . It may also be used to form a radius at the corner of a shoulder . Roundnose tool bits are used as finishing tools .4.The square-nose tool cuts on the end only . It is used for chamfering and forroughing cuts to square a shoulder .5.A cutoff or parting tool cuts on the end only and is used for cutting off stockor workpieces held in a chuck .6.Side-facing tools or side tools , as they are often called , are used forfinishing the ends of work square and smooth .A right-cut side-facing tool is always used to finish the end of a shaft . A left-cut side-facing tool may be used to finish the left side of a shoulder .Chip BreakersTo eliminate the problem of a continuous chip , a chip breaker is often ground on a high-speed steel tool bit .Chip breakers can either be ground on an off-hand grinding wheel , or in the case of the grooved chip breaker , it can be done with a thin grinding wheel on a surface grinder .A separate chip breaker is often used with insert-type carbide tools .Cutting ActionIn lathe turning , there are three basic cutting forces , the longitudinal force of the workpiece against the side of the tool , the radial force of the workpiece against the front of tool , and the tangential force of the workpiece against the top of the tool . The tangential cutting force is by far the greatest and has the most influence on the cutting action . This tremendous force is exerted against the cutting-edge . Pressures as great as a quarter-million pounds per square foot have been measured on large metal-cutting lathes . If the tool is shaped incorrectly or set at an incorrect angle ,it will dull rapidly .Here is what actually happens when cutting on the lathe ,As the workpiecemeets the cutting-edge of the tool bit , chips or a continuous ribbon of metal are wedged away from the material being machined ,On soft , ductile material , this wedging is continuous. On harder materials , the wedging force causes the metal to compress . Compression continues until a shearing point is reached , and the compressed metal is separated from the workpiece . This is repeated throughout the cutting operation .The shape is much more important than the actual sharpness of a cutting-edge . Lack of clearance permits the tool to drag on the workpiece , greatly increasing the pressure on the cutting-edge and interfering withtool performance .Too-large clearance angles make the tool weak and do not edge breaks off or wears out rapidly .Grinding a High-speed Steel Tool BitA tool bit is ground:1.To provide a sharp cutting-edge2. To obtain the correct or best shape for a particular operation3. To provide clearance away form the end of the tool bit4. To provide clearance away form the side of the tool bit5. To provide good chip movement over the face of the tool bit and away the cutting-edgeHere is the correct procedure for grinding a right-cut roundnose tool bit :1.Check the grinding wheels to make certain the faces of the wheels aredressed properly. It is difficult to grind good cutting tools on wheels that areuneven or have grooves in them. Use a bench or floor grinder that is used only for grinding cutting tools. Such a grinder should have a coarse-gritaluminum-oxide wheel on one side and a fine-grit wheel on the other side.Use the coarse-grit wheel for finishing the tool bit to shape. Then use thefine-grit wheel for finishing the tool bit.2.The tool grinder should be equipped with tool rests. Rest your hands on themto control the movement of the tool bit. Hold the tool bit firmly to keep itform bouncing around on the wheel. Do not grip it so tightly,however, that you have difficulty move it.3.Grind the side-relief angle to form the side-cutting-edge angle by holding thetool bit against the wheel, as shown in Fig 18. This angle should be about 6 for mild steel. Hold the tool bit against the wheel, and tilt the bottom inward to get this angle. As you grind, move the tool bit back and forth across the face of the wheel without changing its position. This helps to grind the tool faster and prevents grooving the wheel. As the tool bit heats up, dip it inwater to cool it. A beginner often makes the mistake of moving the tool bit up and down. This forms many different angles on the flank, and it becomesvery irregular. To avoid this, hold the tool bit in affixed position on the wheel.Move it back and forth, but never up or down.4.Grind the side-relief angle on the opposite side to form the shape of the toolbit, as shown in.5.To grind the end-relief angle, holds the tool with the and up. Swing the shankof the tool bit in a semicircle. Try to blend the end radius to meet the sides neatly and cleanly. Always ease up on the pressure when grinding theroundnose of the tool bit. If you fail to so this, you woll grind a largerroundnose tool than desired.6.To grind side rake for a right-cut tool bit, hold the tool bit, face or top, atright angles to the right side of the grinding wheel. Tilt thetool inward at the bottom. Hold it in this position until the wheel cleans up the entire face to the cutting-edge. To grind the side-rake angle for a left-cut tool bit, hold the tool bit at the left side of the grinding wheel. Tilt the bottom inward, and let the grinding wheel clean up the entire face to the cutting-edge. There is noreason to grind the face of the tool bit below the shank at the front end. To do so wastes the expensive tool bit and results in a poorly shaped cutting tool.7.It is good practice to hone tool bits used for finishing work. Select amedium-fine oilstone. Apply a little kerosene or lard cutting oil to theoilstone. Move the cutting-edge back and forth against the oilstone. Be sure to hold the bit flat so as not to change any anglesWith a little practice, you will be able to grind a tool bit correctly. Remember, a well-ground bit is one that has proper tool angles together with flat, evenly ground surface.CARE OF LATHESKeep the lathe clean and well lubricated at all times. Like any precision machine, the lathe requires careful treatment. It will operate better and do accurate work as long as you care for it properly. Do not make the mistake of relying upon others to keep the lathe oiled and in good repair. Your own personal safety depends upon your ability to keep the lathe in a safe operating condition. The proper care of a lathe includes such things as cleaning, oiling, adjusting, and making minor repairs.Cleaning the latheClean the lathe thoroughly after each work period. Whenchips and dirt are left on ways, gears, and other moving parts, the surfaces become roughened and dented. This causes fast wear and makes it difficult to operate the parts. The following procedure is recommended for cleaning a lathe:1. Use a brush first to remove all chips.Most chips are razor sharp, so never use your hands.A 2in paintbrush or a small bench brush is convenient for this purpose. Move the tailstock to the right end of the bed.2. Wipe off all painted surfaces with a clean cloth or cotton waste. Oil left on the painted surfaces becomes hardened and steins the paint.3. Using the same cloth or cotton waste, remove oil and grease form all machined surfaces.4. Brush all chips form the chip pan, them wipe it clean.5. Before mounting a chuck, clean its inside threads with a wore thread cleaner. Wipe off the spindle threads, and place a drop or two of oil on them.6. Clean the spindle holes and taper shanks of centers before mounting them in place. If centers have burrs or rough spots on them, use a file or an oilstone to remove them before placing the centers in the spindle holes.7. Occasionally, clean the thread grooves of the lead screw with a piece lf cord. Place the cord around the lead screw. Adjust the gears to turn the lead screw at a medium sped. Start the lathe, and with the lead screw turning, move the cord back end forth as it feeds along the screw.8. When oiling a lathe, wipe off any oil that may spill or drip on the painted surfaces.9. Always make certain there is a light film of oil on the ways before you start to work.10. Adjust the cross-feed and compound slide gib screws to remove looseness or play between the parts. When you can move the cross-feed by grasping the tool post with your hand and moving it back and forth, it means the gib screws are too loose. Adjust each of the gib screws until a smooth movement is obtained on the cross-feed handle. When they are properly adjusted, it will not be possible to move the cross-feed by pulling or pushing on the tool post.11. Never lay tools or workpieces on the ways of a lathe. To do so destroys the accuracy of these precision handscraped surfaces.place your tools on to lathe board.12.When using a tool-post grinder, always protect the machined surfaces of the lathe by covering them. Abrasive particles from the grinding wheel can become imbedded in the surface bearings end soon destroy the accuracy of the lathe if surfaces are not covered during the grinding operation.13. Once a week wipe down the entire lathe with a Clean cloth dampened with kerosene. Do the painted surfaces first, then the machined surfaces. Wipe dry, and place a thin film of clean oil over all machined surfaces.Oiling and Greasing the LatheIt is important that the lathe be properly lubricated. An oiling or lubrication chart comes with each machine. Be sure to use the grades and kinds of oil and grease called for in the chart. Form the habit of oiling your lathe each day before you start work. Certain parts require daily oiling. Other parts should be oiled weekly or monthly as the chart says. Too often, when several persons use the same lathe, each one depends on the other, and the result is that no one does the oiling or maintenance.刀具和刀夹想顺利的加工工件，就必须做到：1．刀具或刀片的种类要恰当。
数控车床刀库设计参考文献英文
数控车床刀库设计参考文献英文DESIGN OF AN AUTOMATIC TOOL CHANGER WITH DISCMAGAZINE FOR A CNC HORIZONTAL MACHININGCENTERAbstract--Automatic tool changers (ATCs) are devices used in CNC machine tools to exchange the tool in the spindle with the tool in the magazine. In this paper, the design of the ATC of a CNC horizontal machining center which was realized for a CNC machine tool manufacturer is introduced. After examination of several alternatives, it was decided to implement the disc-type ATC. A magazine was designed with 24 tools with a maximum tool diameter of 150 mm and a maximum tool weight of 8 kgf. The designed ATC can change the closest tool within 4 s and thetool farthest away within 6 s. ? 1997 El~vier Science Ltd. All fights reserved 1. INTRODUCTIONAny machine tool manufacturer must either pay for the patent of any particular CNC machine tool, or design its own system to manufacture CNC machine tools. Buying a new technology is an expensive alternative, and it is not generally allowed to make any modifications and developments on the purchased system. The machine tool manufacturers refrain from selling new technologies developed by themselves, and they are generally willing to sell their abandoned technologies.Therefore, a particular CNC machine tool manufacturer has started research and development studies for the design and production of a newCNC horizontal machining center. It was required to design a new systemof ATC for this particular machine tool.An ATC can be defined as a device which can select and change tools from a tool storage magazine according to the commands given by the machine control unit.Various types of ATC with quite different working principles havebeen used in horizontal machining centers produced by the different machine tool manufacturers [1-17]. A tool storage magazine is generally either a chain type or a disc (carousel) type. However, nowadays, there are some other types of magazines such as spherical, cassette, etc. [17].Disc-type magazines may be categorized according to the functions of the discs.(1) In a "disc with a changer arm"-type magazine, the tools are changed by means of an arm which takes the tool from the magazine and exchanges it with the one in the spindle. Therefore, the disc has the functions of indexing and storing the tools only [1-5]. Some examples of this type are shown in Fig. l(a) [1], Fig. l(b) [1] and Fig. l(c) [5].(2) A "disc without a changer arm"-type magazine acts like a tool changer arm. The tools are changed by the disc itself [2, 6--8]. An example of this type is shown in Fig. 2 [1 ]. As shown in the figure,two disc magazines and two spindles mounted on a turret exist in this application.In an ATC with chain-type magazines [9-16], the tool is changed by a changer arm. Chain-type magazines may be categorized according to theorientation of the tools in the magazine with respect to the spindle axis as follows.(1) The axes of the tools on the magazine are perpendicular to the spindle axis and the magazine is on either the right- or left-hand side of the column. Therefore, in order to change the direction of the tools, an arm takes the tool and makes a rotation about a vertical axis to bring the new tool to the position parallel to the spindle axis as shown in Fig. 3(a) [13]. In another version of this type, the tool pots, where the tools are located, are rotated about their own axis to become parallel to the spindle axis, as shown in Fig. 3(b) [12]. The changer arm exchanges the tools between the tool pot and the spindle axis.(2) The axes of tools on the chain magazine are in a plane parallel to the spindle axis. As shown in Fig. 3(c) [12], there is only one position of the tool at which the cutting tool becomes parallel to the spindle axis, and the tool is changed at that position. There is an arm which exchanges the tools between the spindle and the magazine.(3) The axes of tools on the magazine are parallel to the spindle axis. The arm which is in between the spindle and the magazine takes the tool and does a linear motion to approach the spindle and exchange the tools as shown in Fig. 3(d) [16].In Table l, different ATCs and their minimum "tool to toolchange times" (T/T) are given based on the trade literature [2-5, 7-14]. In Table 1, "D+A", "D" and "C+A" designate "disc-type magazine with changer arm", "disc-type magazine without changer arm", and "chain-type magazine with changer arm", respectively. In disc magazines, as the number of tools increases, the diameter of the disc increases, which is an undesirable situation from the space point of view. However, in a chain type, the number of tools is approximately 1.5 times that of the tools in the disc type in the same space [18]. The ATC of the chain typecan store many tools in a very small space. However, the chain-type magazines are expensive compared with the disc-type magazines.2. DESIGN OF ATCIn the stage of clarifying the design specifications for a CNC machine tool, supply and demand in the particular market, potential customers' preferences, specifications of competitors' products which can be obtained from the related trade literature, price of CNC machine tools, etc. should be considered. In accordance with the desired features of the CNC machine tool, the design specifications of ATC are determined.By considering the basic design criteria as simplicity, relatively low cost, relative ease of manufacture, assembly, disassembly, maintenance, and availability of spare parts, a "disc magazine without changer arm"-type ATC was considered to be designed for the particular CNC horizontal machining center [19].Table I. Tool mass and tool change time data for automatic tool changers of various machine tools available in the marketAs shown in Fig. 4, the tool-changing cycle of the designed ATC includes the following basic steps.Step 1. The spindle approaches the magazine to insert the old tool into the tool pocket (Fig. 4(a)).Step 2. After the drawbar releases the old tool, the magazine goes forward along the A-A direction (Fig. 4(b)).Step 3. To bring the new tool into the tool changing position as soon as possible, the magazine is rotated in a clockwise or counterclockwise direction about its axis, depending on the relative position of the tool on the magazine (Fig. 4(c)).Step 4. The magazine is retracted back to insert the new tool into the spindle (Fig. 4(c)).Step 5. When the control unit takes the message from the spindle that the drawbar has been operated to draw the new tool safely, the spindle is let go to start the new machining cycle (Fig. 4(d)).After the decision concerning the type of ATC and the workingprinciple to be used, the specifications for the "disc magazine without changer arm"-type ATC were determined as follows [20]. 1. The number of tools stored (i.e. number of tool stations) in the magazine is 24.2. The maximum tool diameter is 100 mm when the adjacent tool pockets are full.3. The maximum tool diameter is 150 mm when the adjacent tool pockets are empty.4. The maximum weight of the tool including that of the tool holder is 8 kgf.5. The tool holder type is BT40 [21].6. Tool changing times are 4 s and 6 s for the closest and farthest tool on the magazine, respectively.In the following subsections, basic components of the particular ATC are presented.2.1. Disc magazineThe minimum diameter of the disc-type magazine is calculated by considering the specified number of tools to be stored and the maximum tool diameter. A distance between successive tools to be stored in the magazine should be left. The diameter of the disc magazine was calculated as 812 mm by leaving 6 mm between successive tools [19]. After the diameter of the disc magazine has been calculated, the shape of the disc magazine is determined. Low inertia has primary importancebecause of the frequency of acceleration and deceleration of the disc magazine. This can beobtained by using a light material. Aluminium is selected as the material for the disc magazine. A thin walled disc geometry with appropriate webbing which ensures necessary stiffness should be considered.The structure of the disc magazine was made as simple as possible to reduce the cost of the pattern to be used for casting the magazine. A simple sketch is shown in Fig. 5 [19].2.2. Sliding bodyIn any of the ATC systems, there have to be extraction andretraction motions to take the tool holder out of the spindle or to insert a new one. In the "disc without changer arm"-type ATC, the magazine should make a back and forth motion. This necessitates asliding body. These motions can easily be achieved by either a hydraulic or a pneumatic piston. In fact, there are some other methods of having a linear motion such as using a ball screw toconvert the rotary motion into linear motion. However, this methodis extremely expensive when only a simple repetitive motion cycle is required.As seen in Fig. 6, the sliding body was designed hollow to reduce the weight [19]. At the rear, there is a space for the encoder and the coupling inside the body. A pneumatic piston was selected and implemented to push and pull the sliding body. The very back of the body was closed with a lid to which the pneumatic piston was assembled. The slides of the sliding body were designed as square edge but not of dovetail type. The reason for using the square edge type of slide is the ease of manufacturing, price and limited space advantages.2.3. Shock absorbersFor each tool-change cycle, the magazine performsforward-backward motion by the sliding body, which takes up most of the cycle time. To reduce this time. higher traverse speeds are preferred. However, a problem arises concerning the deceleration, where an extremely high level of kinetic energy must be absorbed over a very short distance to stop the system without causing excessive shock loads or vibration. Shock absorbers can be used for this purpose.In the design, a pneumatic piston was used. Owing to the compressibility of the air, pneumatic pistons have sharply rising force characteristics towards the end of the stroke during the cushioning operation. Most of the energy is absorbed near the end of the stroke [22]. Therefore, shock absorbers are required. The pressure generated in front of the particular shock absorber piston remains constant throughout the entire stroke, as the velocity is reduced to zero owing to the specific spacing of the orifices. Consequently, the resisting force remains constant and uniform, and therefore linear deceleration is achieved [22].2.4. Clamping of the toolsThe tools on the disc magazine are kept in the pockets with clamps. The tool may be held between clamping jaws. The clamp is designed in such a way that a tool with a maximum weight can be safely held. Since the disc magazine rotates about its axis, the centrifugal force adds up to the weight of the tool. This is consideredduring the design of the clamping system. The tool pocket and clamping jaws are designed according to the tool-holder type specified. Clamping jaws should have appropriate mating surfaces which fit into the specified tool holder.The tools are kept in the pockets by a combination of leaf andhelical springs which have been designed to hold a tool with a maximum weight of 8 kgf safely [19]. The jaws have tapered surfaces which fit the tool holder of the BT40 [21].2.5. A shield to protect the tool holders from chipsIn design of an ATC, some protective measures are necessary. Ifany chip sticks on to the tapered surface of the tool holder beforeitis inserted into the spindle shaft, it will not be accurately seated in the spindle shaft and will cause run-out, inaccuracy and repeat-ability problems, and the chip may damage the spindle taper. To prevent these, the tool holders should be protected from the chips by a shield which opens just before the spindle reaches the tool change position (Fig. 7) [19]. The shield is kept closed during the machining processes.2.6. Motor and speed reductionThe rotation of the disc can be provided by using a motor and speed reducer combination. After the decision has been made for the type ofmotor, the power and torque requirements are calculated to select an appropriate motor.By considering the positional accuracy and the repeatability, an AC brushless servo motor was used for the rotation of the disc magazine [19]. The motor was selected which can give 4.5 Nm and 0.94 kW rated torque and rated power values, respectively, for At=60 K and 5.5 Nm and1.2 kW for At=-100 K. The motor has a rotational speed of 2000 rpm [23].2.7. Speed reductionSpeed reduction between the magazine and the motor may be provided through worm gear, planetary gear train, harmonic drive, etc. Abacklash-free reduction is necessary for accurate positioning of the tools relative to the spindle bore center while changing the tools. A timing belt is another method which can ensure a zero backlash power transmission. However, high reduction is very difficult to obtain with timing belts in a very small area. Very high reduction ratios canbe obtained with worm-gear sets in a very small area. However, wormgears have back lash problems. Moreover, for high reductions, the efficiency of the system decreases abruptly. If the reduction is done with a very low efficiency worm gear, the required capacity of the motor size gets bigger, which in turn increases the cost of the motor and its control system. In zero backlash worm gears, the worms are of split type and their tooth profiles are special [24].In planetary-gear systems of low prices, the back lash eliminationis obtained by just decreasing the center distance between the gearsuntil a minimum clearance condition is reached without too much noise or heating up. This normally causes high starting torque because of interference, and much lower running efficiency than the same with a normal backlash condition. There are only a few companies in the world which manufacture zero backlash planetary gear trains [25].The harmonic drive is another way of having a zero backlash reduction. The advantages of harmonic drive can be stated as follows[26].(1) The positional accuracy is quite good. The harmonic drivegearing's design ensures that approximately 10% of the total teeth are engaged at any point in time, which minimizes the effect of tooth-to-tooth error.(2) Because of the simple structure of the harmonic drive, it isvery easy to incorporate into a housing which is easy to manufacture, since the machining required is simple in-line boring and turning operations.(3) Since the harmonic drive has a very compact structure and very light weight, the assembly and disassembly are very easy. (4) It is cheaper than any other zero backlash gearing. Because of the above advantages and after the necessary calculations, the harmonic drive was selected and implemented in the ATC [26]. Assuming that half rotation of the disc magazine, including the time elapsed for acceleration and deceleration of it, is completed in 2 s, the rotational speed of the magazine is calculated as 16.67 rpm. This requires a 120:1 reduction toreduce the 2000 rpm motor output to 16.67 rpm magazine rotation. The harmonic drive was selected to obtain 50:1 reduction together with a spur gear pair providing 2.4:1reduction. The output shaft of the harmonic drive is connected to a pinion with the pitch circle diameter of 125 mm which meshes to a gear with a diameter of 300 ram. The gear is bolted on to the disc magazine [19].2.8. Encoder and control switchesThe position of the magazine is very important to insert the right tool into the spindle. This can be provided by using an absolute or incremental encoder. An encoder can also be used for counting the tool stations, which is necessary to index the required tool. Encoders are very sensitive devices which are capable of giving very precise output. If the cables of the encoder are affected by some means from the environment (i.e. interference), the message that is sent to the control unit will be different from its real value. Therefore, another method of counting the tools is recommended to support the encoder as a safety precaution. A switch to count the tools can be used for this purpose. The signals sent by the switch and the encoder are compared to prevent any mistake while indexing the tools. Absolute encoders are expensive when compared to theincremental encoders. As shown in Fig. 6, the positioning of the magazine was achieved by using an incremental encoder directly assembled on the axis of the disc magazine and not on the motor as is normal withservo drive. The angular positioning backlash problem was overcome by placing an incremental encoder directly connected to the disc magazine and situated within the sliding body.The incremental encoder was selected with 3600 lines per revolution.A proximity switch was placed on the sliding body near the disc magazine as a safety precaution. The switch is actuated by 24 dogs mounted on the disc magazine. So, for each tool, there is one dog which actuates the switch, thus enabling both counting of the tool stations and providing a signal to the control unit.Several switches are also required for control purposes. Since the ATC has a rotation axis, the control unit should be capable of recognizing the reference point of the rotation. Otherwise, the control unit does not know the positions of the reference tool and the other tools. Since an incremental encoder was used, a proximity switch was placed on the sliding body to set the home position. If an absolute encoder were used, there would be no need for a home switch since the absolute encoders know at which absolute position they are.A drawbar is a drawing unit, which is used in spindles to pull the tool holder. The ATC and drawbar should work sequentially, otherwise serious problems may occur. To synchronize the operation of the drawbar, the sliding body and rotation of the magazine, two limit switches were used for the front and rear positions of the sliding body to give reliability while changing tools. Anotherproximity switch was placed within the spindle which senses whether the drawbar unit is in its clamp position or not. If the switch is not actuated, it means that either the tool holder is not clamped or it is improperly clamped.The tool pocket which will pick the tool in the spindle must be unoccupied before the approach of the spindle, otherwise a crash occurs, which causes damage to the tools, spindle and magazine. To prevent such damage, a proximity switch was used to check whether the particular tool pocket was occupied (Fig. 7) [19]. 3. IMPLEMENTATION AND TEST OF AUTOMATIC TOOLCHANGERThe particular CNC horizontal machining center wasmanufactured and assembled. Each system was tested and runseparately or as a whole of the machine tool by the CNC machine tool manufacturer. At the end of the tests, it was reported that everything within the ATC was running without any problems. The designed ATC was tested for which the T/T for the closest tool is 4 s, whereas it is 6 s when the farthest tool is of concern. The particular machine tool was used in the production line in the particular CNC machine tool manufacturer without any reported problems relating to the designed ATC system.4. CONCLUSIONIn this paper, the working principle and the design criteria of an ATC with a disc magazine without a changer arm has been presented. This type of ATC has been found to be suitable for the particular CNC machine tool manufacturer when considering the design period,the compulsion being to enter the market as quickly as possible. The minimum T/T for the designed ATC, which is 4 s, is quite reasonable when compared with those given in Table 1. Therefore, the realized ATC system has provided a competitive position for the machining center in the market.Acknowledgements—The authors wish to express theirappreciation to TAKSAN Machine Tool Industry and Trade Co., Kayseri, Turkey, for support in the design and manufacturing of the particularATC. The authors also thank METU Prof. Dr Mustafa N. Parlar Education and Research Foundation, and METUCAD/CAM/ROBOTICS Center, Ankara, Turkey, for allowing theirfacilities to be used in this study.REFERENCES[1] A.N. Kobuladze and L.M. Prupis, Automatic tool changers for machining centers with horizontal spindles, Machines and Tooling 45(5), 56 (1974).[2]Sidepalsa Trade Literature. Sidepalsa Sistemas De Paletizacion, S.A., Spain.[3] NTC Trade Literature. NTC Nippei Toyama Corporation, Japan.[4] Olivetti Trade Literature. Olivetti Controllo Numerico SpA, Italy.[5] Mandelli Trade Literature. Mandelli SpA, Piacenza, Italy. [6] Bridgeport Trade Literature. Bridgeport Machine Tools, U.K. [7] White--Sundstrand Trade Literature. White-Sundstrand, White Consolidated Machine Tool Group, IL,U.S.A.[8] Leadwell Trade Literature. Leadwell Machine Tools, Taiwan.[9] Mazak Trade Literature. Yamazaki Mazak Corporation, Japan.[10]Burkhard+Weber Trade Literature. Burkhard+Weher GmbH Werkzeugmachinenfabrik, Reutlingen, Germany.[11]Matsuura Trade Literature. Matsuura Machinery Corporation,Fukui-City, Japan.[12] Mauser-Werke Trade Literature. Mauser-Werke GmbH, Oherndorf, Germany.[131 Hitachi Seiki Trade Literature. Hitachi Seiki Co. Ltd, Japan.[14] Mechanicy Trade Literature. Mechanicy, Czechoslovakia. [I 5] Cincinati Milacron Trade Literature, Cincinati Milacron, Cincinati, OH, U.S.A.[16] Hwacheon Trade Literature. Hwacheon Machinery, Seoul, South Korea.[17] Starrfrdsmachinen Trade Literature. Starrfrllsmachinen AG, Larigidesa Rigid Ltd, Switzerland.[18] Fudow Tool Pots Trade literature. Fudow Chemical Co. Ltd, Japan.[19] M.B. Ko~, Design of automatic tool changer for CNC machines.M.Sc. thesis, Mechanical EngineeringDepartmet, METU, Ankara, Turkey 1995.[20] TAKSAN Machine Tool Industry and Trade Co., Turkey,Private communication.。
数控技术外文文献翻译
数控技术外文文献翻译(含：英文原文及中文译文)英文原文The development trend of numerical control technology AbstractThe current trends in the development of numerical control technology and equipment in the world and the status quo of the development and industrialization of CNC equipment technology in China are briefly introduced. On this basis, we discuss the development of CNC technology and equipment in China under the new environment of China's accession to the WTO and further opening to the outside world. The importance of improving the level of China's manufacturing informatization and international competitiveness, and put forward some views on the development of China's CNC technology and equipment from both strategic and strategic aspects.The technological level and degree of modernization of the equipment industry determine the level of the entire national economy and the degree of modernization. Numerical control technology and equipment are the development of emerging high-tech industries and cutting-edge industries (such as information technology and its industries, biotechnology and its industries, aviation, aerospace, etc.) (Defense Industry Industry) enabling technology and basic equipment. Marx oncesaid that “the difference between various economic times is no t what is produced but how it is produced and what labor data it is used to produce”. Manufacturing technology and equipment are the most basic production materials for human production activities, and numerical control technology is the core technology of today's advanced manufacturing technologies and equipment. In the manufacturing industry of the world today, CNC technology is widely used to improve manufacturing capabilities and levels, and to improve the adaptability and competitiveness of dynamic markets. In addition, various industrialized countries in the world have also listed numerical control technology and numerical control equipment as strategic materials of the country. They not only take significant measures to develop their own numerical control technologies and their industries, but also have the key technology and equipment of “high-precision” numerical control. Our country adopts a policy of blockade and restriction. In short, the vigorous development of advanced manufacturing technologies centered on numerical control technology has become an important way for all developed countries in the world to accelerate economic development and improve their overall national strength and national status.Numerical control technology is a technology that uses digital information to control mechanical movement and work process. Numerical control equipment is a mechatronic product formed by thepenetration of new technologies represented by numerical control technology into traditional manufacturing industries and emerging manufacturing industries, namely, so-called digital equipment. Its technical scope covers many fields: (1) machinery manufacturing technology; (2) information processing, processing, and transmission technology; (3) automatic control technology; (4) servo drive technology;(5) sensor technology; (6) software Technology and so on. Keywords: CNC technology, machinery manufacturing, information processing, sensors1 Development Trends of Numerical Control TechnologyThe application of numerical control technology has not only brought about revolutionary changes in the traditional manufacturing industry, but also made manufacturing a symbol of industrialization. With the continuous development of numerical control technology and the expansion of application fields, he has made important contributions to the national economy and people's livelihood (IT, automotive The development of light industry, light industry, medical care, etc. is playing an increasingly important role, because the digitalization of the equipment required by these industries is a major trend of modern development. From the current trend of numerical control technology and its equipment development in the world, its main research hotspots are the following aspects [1~4].1.1 New trends in high-speed, high-precision processing technology and equipmentEfficiency and quality are the mainstays of advanced manufacturing technology. High-speed, high-precision machining technology can greatly improve efficiency, improve product quality and grade, shorten production cycle and increase market competitiveness. To this end, the Japanese Advanced Technology Research Institute will list it as one of the five major modern manufacturing technologies. The International Association of Production Engineers (CIRP) has identified it as one of the central research directions for the 21st century.In the passenger car industry, the production cycle of 300,000 vehicles per year is 40 seconds per vehicle, and multi-species processing is one of the key issues that must be addressed for car equipment. In the aviation and aerospace industries, the parts processed by them are mostly thin-walled. With thin ribs, the rigidity is poor, and the material is aluminum or aluminum alloy. These ribs and walls can be processed only when the high cutting speed and cutting force are small. Recently, the method of “hollowing out” large-size aluminum alloy billets has been used to manufacture large parts such as wings and fuselage to replace multiple parts and assembled by numerous rivets, screws, and other coupling methods to obtain strength, stiffness, and reliability of components. improve. All of these require high-speed, high-precision andhigh-flexibility for processing equipment.From the standpoint of EMO2001, the feed rate of high-speed machining centers can reach 80m/min, or even higher, and the airspeed can reach around 100m/min. At present, many automobile plants in the world, including China's Shanghai General Motors Corporation, have adopted a part of the production line consisting of a high-speed machining center to replace the combined machine tools. The HyperMach machine tool feed rate of CINCINNATI, USA is up to 60m/min, the speed is 100m/min, the acceleration is 2g, and the spindle speed has reached 60,000r/min. It takes only 30 minutes to machine a thin-walled aircraft part, and the same part takes 3h for general high-speed milling and 8h for normal milling; the spindle speed and acceleration of the twin-spindle lathe of DMG, Germany, reach 12*!000r/mm respectively. And 1g.In terms of machining accuracy, in the past 10 years, the machining accuracy of ordinary CNC machine tools has increased from 10μm to 5μm, precision machining centers have increased from 3~5μm to 1~1.5μm, and ultra-precision machining precision has begun to enter the nanometer level. (0.01μm).In terms of reliability, the MTBF value of foreign numerical control devices has reached more than 6000 hours, and the MTBF value of the servo system has reached more than 30,000 hours, showing very highreliability.In order to achieve high-speed, high-precision machining, the supporting functional components such as electric spindles and linear motors have been rapidly developed and the application fields have been further expanded.1.2 Rapid development of 5-axis simultaneous machining and compound machiningThe use of 5-axis simultaneous machining of 3D surface parts allows cutting with the best geometry of the tool, resulting in not only a high degree of finish, but also a significant increase in efficiency. It is generally considered that the efficiency of a 5-axis machine tool can be equal to 2 3-axis linkage machines. Especially when using ultra-hard material milling tools such as cubic boron nitride for high-speed milling of hardened steel parts, 5-axis simultaneous machining can be compared with 3-axis linkage. Processing to play a higher efficiency. In the past, due to the complexity of the 5-axis linkage CNC system and the host machine structure, the price was several times higher than that of the 3-axis linkage CNC machine tool, and the programming technology was more difficult, which restricted the development of 5-axis linkage machine tools.At present, due to the emergence of electric spindles, the structure of the composite spindle head that realizes 5-axis simultaneous machining isgreatly simplified, its manufacturing difficulty and cost are greatly reduced, and the price gap of the numerical control system is reduced. As a result, the development of composite spindle head type 5-axis linkage machine tools and compound machine tools (including 5-sided machine tools) has been promoted.At the EMO2001 exhibition, the new 5-axis machine tool of Nippon Machine Tool Co., Ltd. adopts a compound spindle head, which can realize the processing of four vertical planes and processing at any angle, so that 5-sided machining and 5-axis machining can be realized on the same machine tool. It can realize the processing of inclined surface and inverted cone. Germany DMG company exhibited DMUV oution series machining center, which can be processed in five-face machining and five-axis linkage in a single clamping. It can be directly or indirectly controlled by CNC system control or CAD/CAM.1.3 Intelligentization, openness, and networking have become major trends in the development of modern digital control systemsThe 21st century CNC equipment will be a certain intelligent system. The intelligent content is included in all aspects of the CNC system: in order to pursue the processing efficiency and processing quality in the intelligent, such as the process of adaptive control, process parameters automatically Generated; To improve the driving performance and the use of convenient connection intelligent, such as feed-forward control,adaptive calculation of motor parameters, automatic identification load automatic selection model, self-tuning, etc.; simplify the programming, simplify the operation of intelligent, such as smart The automatic programming, intelligent man-machine interface, etc.; as well as the contents of intelligent diagnosis, intelligent monitoring, convenient system diagnosis and maintenance.In order to solve the problems of traditional CNC system closure and industrial application of CNC application software. At present, many countries have conducted research on open numerical control systems such as NGC of the United States, OSACA of the European Community, OSEC of Japan, and ONC of China. The openness of numerical control systems has become the future of CNC systems. The so-called open CNC system is the development of CNC system can be in a unified operating platform, for machine tool manufacturers and end users, by changing, adding or cutting structure objects (CNC function), to form a series, and can be convenient to the user's special The application and technology are integrated into the control system to quickly realize open numerical control systems of different varieties and different grades to form brand-name products with distinctive personality. At present, the architecture specification, communication specification, configuration specification, operation platform, numerical control system function library and numerical control system function software development toolof open CNC system are the core of current research.Networked CNC equipment is a new bright spot in the international well-known machine tool exposition in the past two years. The networking of CNC equipment will greatly satisfy the requirements of information integration for production lines, manufacturing systems, and manufacturing companies. It is also the basic unit for realizing new manufacturing models such as agile manufacturing, virtual enterprise, and global manufacturing. Some famous domestic and foreign CNC machine tools and numerical control system manufacturing companies have introduced relevant new concepts and prototypes in the past two years. For example, at the EMO 2001 exhibition, the “Cyber Production Center” exhibited by Japan's Mazak company Mazak Production Control Center (CPC); Okuma Machine Too l Company, Japan exhibited “ITplaza” (Information Technology Plaza, IT Plaza); Open Manufacturing Environment (Open Manufacturing Environment, OME), exhibited by Siemens, Germany Etc., reflecting the trend of the development of CNC machine tools to the direction of the network.1.4 Emphasizing the Establishment of New Technology Standards and Specifications1.4.1 About Design and Development of CNC SystemsAs mentioned above, the open CNC system has better versatility, flexibility, adaptability, and expandability. The United States, theEuropean Community, and Japan have implemented strategic development plans one after another, and have conducted the open architecture system specification (OMAC). , OSACA, OSEC) research and development, the world's three largest economies in the short term carried out almost the same set of scientific plans and norms, indicating that the arrival of a new revolution in digital technology. In 2000, China began to conduct research and development of the regulatory framework for China's ONC numerical control system.1.4.2 About CNC StandardsCNC standards are a trend in the development of manufacturing informatization. The information exchange in the 50 years since the birth of CNC technology was based on the ISO 6983 standard. That is how the G and M codes describe how to process. The essential feature is the processing-oriented process. Obviously, he has been unable to meet the high speed of modern CNC technology. The need for development. For this purpose, a new CNC system standard ISO14649 (STEP-NC) is being researched and developed internationally. Its purpose is to provide a uniform data model that can describe the entire life cycle of a product without relying on a neutral mechanism of a specific system. , in order to achieve the entire manufacturing process, and even the standardization of product information in various industrial fields. The emergence of STEP-NC may be a revolution in CNC technology. It will have aprofound impact on the development of CNC technology and even the entire manufacturing industry. First, STEP-NC proposes a brand-new manufacturing concept. In the traditional manufacturing concept, NC machining programs are concentrated on a single computer. Under the new standard, NC programs can be distributed on the Internet. This is the direction of open and networked CNC technology. Secondly, STEP-NC CNC system can also greatly reduce the processing drawings (about 75%), processing program preparation time (about 35%) and processing time (about 50%).At present, European and American countries attach great importance to the research of STEP-NC, and Europe has initiated STEP-NC's IMS plan ( Participation in this program comes from 20 CAD/CAM/CAPP/CNC users, vendors and academic institutions in Europe and Japan. STEPTools of the United States is the developer of global manufacturing data exchange software. He has developed a SuperModel for the information exchange of CNC machine tools. Its goal is to describe all machining processes with a unified specification. This new data exchange format has now been validated on prototype prototypes equipped with SIEMENS, FIDIA and European OSACA-NC numerical control systems.2 Basic Estimates of China's CNC Technology and Its Industrial DevelopmentCNC technology in China started in 1958. The development process in the past 50 years can be roughly divided into three stages: the first stage from 1958 to 1979, which is the closed development stage. At this stage, the development of numerical control technology is relatively slow due to the limitations of foreign technology and China's basic conditions. The second stage is the introduction of technology during the “sixth and fifth” periods of the country, the “seventh five-year plan” period, and the “eighth five-year plan period,”and it will be digested and absorbed to initially establish the stage of the national production system. At this stage, due to the reform and opening up and the country’s attention, as well as the improvement of the research and development environment an d the international environment, China’s CNC technology has made great progress in research, development, and localization of products. The third stage is the implementation of industrialization research in the later period of the "Eighth Five-Year Plan" and the "Ninth Five-Year Plan" period of the country, entering the stage of market competition. At this stage, the industrialization of domestically-manufactured CNC equipment has achieved its essenceSexual progress. At the end of the “Ninth Five-Year Plan” period, the domestic market share of domestic CNC machine tools reached 50%, and the number of domestically-manufactured numerical control systems (pervasive models) also reached 10%.Looking at the development process of CNC technology in China in the past 50 years, especially after four five-year plans, the overall results are as follows:a. It lays the foundation for the development of CNC technology and basically masters modern CNC technology. China has now basically mastered the basic technologies from numerical control systems, servo drives, numerical control mainframes, special planes and their accessories. Most of these technologies already have the basis for commercial development. Some technologies have been commercialized and industrialized.b. Initially formed a CNC industrial base. Based on the research results and the commercialization of some technologies, we have established numerical control system production plants such as Huazhong Numerical Control and Aerospace Numerical Control which have mass production capabilities. Lanzhou Electric Machinery Factory, Huazhong Numerical Control and a number of servo systems and servo motor manufacturers, as well as a number of CNC machine manufacturers such as Beijing No. 1 Machine Tool Plant and Jinan No. 1 Machine Tool Plant. These production plants have basically formed China's CNC industrial base.c. Established a basic team of CNC research, development and management talents.Although significant progress has been made in the research, development, and industrialization of numerical control technology, we must also soberly realize that the research and development of high-end numerical control technologies in China, especially the status quo of the technological level of industrialization and the actual needs of China There is a big gap. Although our country's development speed is very fast in the vertical direction, the horizontal ratio (compared with foreign countries) not only has a gap in the level of technology, but also has a gap in the development speed in certain aspects, that is, the gap in the technological level of some highly sophisticated numerical control equipment has expanded. From the international point of view, the estimated level of China's numerical control technology and industrialization is roughly as follows:a. On the technical level, it will be about 10 to 15 years behind the advanced level in foreign countries, and it will be even bigger in terms of sophisticated technology.b. At the industrialization level, the market share is low, the variety coverage is small, and scale production has not yet been established; the specialized production level of functional components and the complete set capacity are low; the appearance quality is relatively poor; the reliability is not high, and the degree of commercialization is insufficient; The domestic CNC system has not established its own brand effect, andthe user's confidence is insufficient.c. On the ability of sustainable development, the research and development and engineering capabilities of pre-competitive numerical control technology are weak; the application of numerical control technology is not strong; the research and formulation of related standard specifications is lagging behind.The main reasons for analyzing the above gaps are as follows:a. Awareness. Insufficient understanding of the arduous, complex and long-term characteristics of the domestic CNC industry process; Insufficient estimates of market irregularities, foreign blockades, killings, and systems; and insufficient analysis of the application level and capabilities of CNC technology in China.b. Systematic aspects. From the point of view of technology, attention has been paid to the issue of CNC industrialization. It has been a time to consider the issue of CNC industrialization from the perspectives of system and industry chain; there is no complete supporting system of high-quality supporting systems, perfect training, and service networks. .c. Mechanisms. Bad mechanisms have led to brain drain, which in turn has restricted technological and technological route innovations and product innovations, and has constrained the effective implementation of planning. It is often planned to be ideal and difficult to implement.d. Technical aspects. Enterprises have little ability to independentlyinnovate in technology, and the engineering ability of core technologies is not strong. The standard of machine tools is backward, the level is low, and the new standard of CNC system is not enough.3 Strategic Thinking on the Development of CNC Technology and Industrialization in China3.1 Strategic ConsiderationsChina is a manufacturing country, and we must try to accept the transfer of the front-end rather than the back-end in the industrial transfer of the world. That is to master the advanced manufacturing core technologies, otherwise, in the new round of international industrial restructuring, China's manufacturing industry will further “empty core”. At the expense of resources, the environment, and the market, we may obtain only the international "processing centers" and "assembly centers" in the world's new economic structure, rather than the status of manufacturing centers that master core technologies. This will seriously affect our country. The development of modern manufacturing.We should pay attention to numerical control technology and industrial issues from the perspective of national security strategy. First of all, we must look at social security because manufacturing industry is the industry with the largest number of employed people in China. Manufacturing industry development can not only improve the people’s living standards, but also ease the country’s The pressure of employmentguarantees social stability. Secondly, from the perspective of national defense security, Western developed countries classify high-precision numerical control products as national strategic materials and implement embargoes and restrictions on China. The “Toshiba Incident” and the “Cox Report” "This is the best illustration.3.2 Development StrategyFrom the perspective of China’s basic national conditions, taking the country’s strategic needs and the market demand of the national economy as the guide, and aiming at improving the comprehensive competitiveness and industrialization le vel of China’s manufacturing equipment industry, we can use systematic methods to choose to dominate the early 21st century in China. The key technologies for the development and upgrade of the manufacturing equipment industry and supporting technologies and supporting technologies for supporting industrialization development are the contents of research and development and the leap-forward development of the manufacturing equipment industry. Emphasizing the market demand as the orientation, that is, taking CNC terminal products as the mainstay, and driving the CNC industry with complete machines (such as large-scale CNC lathes, milling machines, high-speed, high-precision and high-performance CNC machine tools, typical digital machines, key equipment of key industries, etc.). development of. The focus is on the reliability and production scale of CNC systems andrelated functional components (digital servos and motors, high-speed spindle systems and accessories for new equipment, etc.). Without scale, there will be no high-reliability products; without scale, there will be no cheap and competitive products; of course, CNC equipment without scale in China will be difficult to come to the fore. In the research and development of high-precision equipment, we must emphasize the close integration of production, learning, research, and end-users, and aim at “doing, using, and selling off” as a goal, and implement national research on the will of the country to solve the urgent need of the country. . Before the competition, CNC technology emphasizes innovation, emphasizes research and development of technologies and products with independent intellectual property rights, and lays a foundation for the sustainable development of China's CNC industry, equipment manufacturing industry, and even the entire manufacturing industry.中文译文数控技术的发展趋势摘要本文简要介绍了当今世界数控技术及装备发展的趋势及我国数控装备技术发展和产业化的现状, 在此基础上讨论了在我国加入WTO 和对外开放进一步深化的新环境下, 发展我国数控技术及装备、提高我国制造业信息化水平和国际竞争能力的重要性, 并从战略和策略两个层面提出了发展我国数控技术及装备的几点看法。
数控加工外文翻译文献
数控加工外文翻译文献(文档含中英文对照即英文原文和中文翻译)原文:Basic Machining Operations and CuttingTechnologyBasic Machining OperationsMachine tools have evolved from the early foot-powered lathes of the Egyptians and John Wilkinson's boring mill. They are designed to provide rigid support for both the workpiece and the cutting tool and can precisely control their relative positions and the velocity of the tool with respect to the workpiece. Basically, in metal cutting, a sharpened wedge-shaped tool removes a rather narrow strip of metal from the surface of a ductile workpiece in the form of a severely deformed chip. The chip is a waste product that is considerably shorter than the workpiece from which it came but with a corresponding increase in thickness of the uncut chip. The geometrical shape of workpiece depends on the shape of the tool and its path during the machining operation.Most machining operations produce parts of differing geometry. If a rough cylindrical workpiece revolves about a central axis and the tool penetrates beneath its surface and travels parallel to the center of rotation, a surface of revolution is produced, and the operation is called turning. If a hollow tube is machined on the inside in a similar manner, the operation is called boring. Producing an external conical surface uniformly varying diameter is called taper turning, if the tool point travels in a path of varying radius, a contoured surface like that of a bowling pin can be produced; or, if the piece is short enough and the support is sufficiently rigid, a contoured surface could be produced by feeding a shaped tool normal to the axis of rotation. Short tapered or cylindrical surfaces could also be contour formed.Flat or plane surfaces are frequently required. They can be generated by radial turning or facing, in which the tool point moves normal to the axis of rotation. In other cases, it is more convenient to hold the workpiece steady andreciprocate the tool across it in a series of straight-line cuts with a crosswise feed increment before each cutting stroke. This operation is called planning and is carried out on a shaper. For larger pieces it is easier to keep the tool stationary and draw the workpiece under it as in planning. The tool is fed at each reciprocation. Contoured surfaces can be produced by using shaped tools.Multiple-edged tools can also be used. Drilling uses a twin-edged fluted tool for holes with depths up to 5 to 10 times the drill diameter. Whether the drill turns or the workpiece rotates, relative motion between the cutting edge and the workpiece is the important factor. In milling operations a rotary cutter with a number of cutting edges engages the workpiece. Which moves slowly with respect to the cutter. Plane or contoured surfaces may be produced, depending on the geometry of the cutter and the type of feed. Horizontal or vertical axes of rotation may be used, and the feed of the workpiece may be in any of the three coordinate directions.Basic Machine ToolsMachine tools are used to produce a part of a specified geometrical shape and precise I size by removing metal from a ductile material in the form of chips. The latter are a waste product and vary from long continuous ribbons of a ductile material such as steel, which are undesirable from a disposal point of view, to easily handled well-broken chips resulting from cast iron. Machine tools perform five basic metal-removal processes: I turning, planning, drilling, milling, and grinding. All other metal-removal processes are modifications of these five basic processes. For example, boring is internal turning; reaming, tapping, and counter boring modify drilled holes and are related to drilling; bobbing and gear cutting are fundamentally milling operations; hack sawing and broaching are a form of planning and honing; lapping, super finishing. Polishing and buffing are variants of grinding or abrasive removal operations. Therefore, there are only four types of basic machine tools, which use cuttingtools of specific controllable geometry: 1. lathes, 2. planers, 3. drilling machines, and 4. milling machines. The grinding process forms chips, but the geometry of the abrasive grain is uncontrollable.The amount and rate of material removed by the various machining processes may be I large, as in heavy turning operations, or extremely small, as in lapping or super finishing operations where only the high spots of a surface are removed.A machine tool performs three major functions: 1. it rigidly supports the workpiece or its holder and the cutting tool; 2. it provides relative motion between the workpiece and the cutting tool; 3. it provides a range of feeds and speeds usually ranging from 4 to 32 choices in each case.Speed and Feeds in MachiningSpeeds, feeds, and depth of cut are the three major variables for economical machining. Other variables are the work and tool materials, coolant and geometry of the cutting tool. The rate of metal removal and power required for machining depend upon these variables.The depth of cut, feed, and cutting speed are machine settings that must be established in any metal-cutting operation. They all affect the forces, the power, and the rate of metal removal. They can be defined by comparing them to the needle and record of a phonograph. The cutting speed (V) is represented by the velocity of- the record surface relative to the needle in the tone arm at any instant. Feed is represented by the advance of the needle radially inward per revolution, or is the difference in position between two adjacent grooves. The depth of cut is the penetration of the needle into the record or the depth of the grooves.Turning on Lathe CentersThe basic operations performed on an engine lathe are illustrated. Those operations performed on external surfaces with a single point cutting tool arecalled turning. Except for drilling, reaming, and lapping, the operations on internal surfaces are also performed by a single point cutting tool.All machining operations, including turning and boring, can be classified as roughing, finishing, or semi-finishing. The objective of a roughing operation is to remove the bulk of the material as rapidly and as efficiently as possible, while leaving a small amount of material on the work-piece for the finishing operation. Finishing operations are performed to obtain the final size, shape, and surface finish on the workpiece. Sometimes a semi-finishing operation will precede the finishing operation to leave a small predetermined and uniform amount of stock on the work-piece to be removed by the finishing operation.Generally, longer workpieces are turned while supported on one or two lathe centers. Cone shaped holes, called center holes, which fit the lathe centers are drilled in the ends of the workpiece-usually along the axis of the cylindrical part. The end of the workpiece adjacent to the tailstock is always supported by a tailstock center, while the end near the headstock may be supported by a headstock center or held in a chuck. The headstock end of the workpiece may be held in a four-jaw chuck, or in a type chuck. This method holds the workpiece firmly and transfers the power to the workpiece smoothly; the additional support to the workpiece provided by the chuck lessens the tendency for chatter to occur when cutting. Precise results can be obtained with this method if care is taken to hold the workpiece accurately in the chuck.Very precise results can be obtained by supporting the workpiece between two centers. A lathe dog is clamped to the workpiece; together they are driven by a driver plate mounted on the spindle nose. One end of the Workpiece is mecained;then the workpiece can be turned around in the lathe to machine the other end. The center holes in the workpiece serve as precise locating surfaces as well as bearing surfaces to carry the weight of the workpiece and to resist the cutting forces. After the workpiece has been removed from the lathe for any reason, the center holes will accurately alignthe workpiece back in the lathe or in another lathe, or in a cylindrical grinding machine. The workpiece must never be held at the headstock end by both a chuck and a lathe center. While at first thought this seems like a quick method of aligning the workpiece in the chuck, this must not be done because it is not possible to press evenly with the jaws against the workpiece while it is also supported by the center. The alignment provided by the center will not be maintained and the pressure of the jaws may damage the center hole, the lathe center, and perhaps even the lathe spindle. Compensating or floating jaw chucks used almost exclusively on high production work provide an exception to the statements made above. These chucks are really work drivers and cannot be used for the same purpose as ordinary three or four-jaw chucks.While very large diameter workpieces are sometimes mounted on two centers, they are preferably held at the headstock end by faceplate jaws to obtain the smooth power transmission; moreover, large lathe dogs that are adequate to transmit the power not generally available, although they can be made as a special. Faceplate jaws are like chuck jaws except that they are mounted on a faceplate, which has less overhang from the spindle bearings than a large chuck would have.Introduction of MachiningMachining as a shape-producing method is the most universally used and the most important of all manufacturing processes. Machining is a shape-producing process in which a power-driven device causes material to be removed in chip form. Most machining is done with equipment that supports both the work piece and cutting tool although in some cases portable equipment is used with unsupported workpiece.Low setup cost for small Quantities. Machining has two applications in manufacturing. For casting, forging, and press working, each specific shape to be produced, even one part, nearly always has a high tooling cost. The shapes that may he produced by welding depend to a large degree on the shapes ofraw material that are available. By making use of generally high cost equipment but without special tooling, it is possible, by machining; to start with nearly any form of raw material, so tong as the exterior dimensions are great enough, and produce any desired shape from any material. Therefore .machining is usually the preferred method for producing one or a few parts, even when the design of the part would logically lead to casting, forging or press working if a high quantity were to be produced.Close accuracies, good finishes. The second application for machining is based on the high accuracies and surface finishes possible. Many of the parts machined in low quantities would be produced with lower but acceptable tolerances if produced in high quantities by some other process. On the other hand, many parts are given their general shapes by some high quantity deformation process and machined only on selected surfaces where high accuracies are needed. Internal threads, for example, are seldom produced by any means other than machining and small holes in press worked parts may be machined following the press working operations.Primary Cutting ParametersThe basic tool-work relationship in cutting is adequately described by means of four factors: tool geometry, cutting speed, feed, and depth of cut.The cutting tool must be made of an appropriate material; it must be strong, tough, hard, and wear resistant. The tool s geometry characterized by planes and angles, must be correct for each cutting operation. Cutting speed is the rate at which the work surface passes by the cutting edge. It may be expressed in feet per minute.For efficient machining the cutting speed must be of a magnitude appropriate to the particular work-tool combination. In general, the harder the work material, the slower the speed.Feed is the rate at which the cutting tool advances into the workpiece. "Where the workpiece or the tool rotates, feed is measured in inches perrevolution. When the tool or the work reciprocates, feed is measured in inches per stroke, Generally, feed varies inversely with cutting speed for otherwise similar conditions.The depth of cut, measured inches is the distance the tool is set into the work. It is the width of the chip in turning or the thickness of the chip in a rectilinear cut. In roughing operations, the depth of cut can be larger than for finishing operations.The Effect of Changes in Cutting Parameters on Cutting TemperaturesIn metal cutting operations heat is generated in the primary and secondary deformation zones and these results in a complex temperature distribution throughout the tool, workpiece and chip. A typical set of isotherms is shown in figure where it can be seen that, as could be expected, there is a very large temperature gradient throughout the width of the chip as the workpiece material is sheared in primary deformation and there is a further large temperature in the chip adjacent to the face as the chip is sheared in secondary deformation. This leads to a maximum cutting temperature a short distance up the face from the cutting edge and a small distance into the chip.Since virtually all the work done in metal cutting is converted into heat, it could be expected that factors which increase the power consumed per unit volume of metal removed will increase the cutting temperature. Thus an increase in the rake angle, all other parameters remaining constant, will reduce the power per unit volume of metal removed and the cutting temperatures will reduce. When considering increase in unreformed chip thickness and cutting speed the situation is more complex. An increase in undeformed chip thickness tends to be a scale effect where the amounts of heat which pass to the workpiece, the tool and chip remain in fixed proportions and the changes in cutting temperature tend to be small. Increase in cutting speed; however, reduce the amount of heat which passes into the workpiece and this increase the temperature rise of the chip m primary deformation. Further, the secondarydeformation zone tends to be smaller and this has the effect of increasing the temperatures in this zone. Other changes in cutting parameters have virtually no effect on the power consumed per unit volume of metal removed and consequently have virtually no effect on the cutting temperatures. Since it has been shown that even small changes in cutting temperature have a significant effect on tool wear rate it is appropriate to indicate how cutting temperatures can be assessed from cutting data.The most direct and accurate method for measuring temperatures in high -speed-steel cutting tools is that of Wright &. Trent which also yields detailed information on temperature distributions in high-speed-steel cutting tools. The technique is based on the metallographic examination of sectioned high-speed-steel tools which relates microstructure changes to thermal history.Trent has described measurements of cutting temperatures and temperature distributions for high-speed-steel tools when machining a wide range of workpiece materials. This technique has been further developed by using scanning electron microscopy to study fine-scale microstructure changes arising from over tempering of the tempered martens tic matrix of various high-speed-steels. This technique has also been used to study temperature distributions in both high-speed -steel single point turning tools and twist drills.Wears of Cutting ToolDiscounting brittle fracture and edge chipping, which have already been dealt with, tool wear is basically of three types. Flank wear, crater wear, and notch wear. Flank wear occurs on both the major and the minor cutting edges. On the major cutting edge, which is responsible for bulk metal removal, these results in increased cutting forces and higher temperatures which if left unchecked can lead to vibration of the tool and workpiece and a condition where efficient cutting can no longer take place. On the minor cutting edge, which determines workpiece size and surface finish, flank wear can result in anoversized product which has poor surface finish. Under most practical cutting conditions, the tool will fail due to major flank wear before the minor flank wear is sufficiently large to result in the manufacture of an unacceptable component.Because of the stress distribution on the tool face, the frictional stress in the region of sliding contact between the chip and the face is at a maximum at the start of the sliding contact region and is zero at the end. Thus abrasive wear takes place in this region with more wear taking place adjacent to the seizure region than adjacent to the point at which the chip loses contact with the face. This result in localized pitting of the tool face some distance up the face which is usually referred to as catering and which normally has a section in the form of a circular arc. In many respects and for practical cutting conditions, crater wear is a less severe form of wear than flank wear and consequently flank wear is a more common tool failure criterion. However, since various authors have shown that the temperature on the face increases more rapidly with increasing cutting speed than the temperature on the flank, and since the rate of wear of any type is significantly affected by changes in temperature, crater wear usually occurs at high cutting speeds.At the end of the major flank wear land where the tool is in contact with the uncut workpiece surface it is common for the flank wear to be more pronounced than along the rest of the wear land. This is because of localised effects such as a hardened layer on the uncut surface caused by work hardening introduced by a previous cut, an oxide scale, and localised high temperatures resulting from the edge effect. This localised wear is usually referred to as notch wear and occasionally is very severe. Although the presence of the notch will not significantly affect the cutting properties of the tool, the notch is often relatively deep and if cutting were to continue there would be a good chance that the tool would fracture.If any form of progressive wear allowed to continue, dramatically and the tool would fail catastrophically, i. e. the tool would be no longer capable ofcutting and, at best, the workpiece would be scrapped whilst, at worst, damage could be caused to the machine tool. For carbide cutting tools and for all types of wear, the tool is said to have reached the end of its useful life long before the onset of catastrophic failure. For high-speed-steel cutting tools, however, where the wear tends to be non-uniform it has been found that the most meaningful and reproducible results can be obtained when the wear is allowed to continue to the onset of catastrophic failure even though, of course, in practice a cutting time far less than that to failure would be used. The onset of catastrophic failure is characterized by one of several phenomena, the most common being a sudden increase in cutting force, the presence of burnished rings on the workpiece, and a significant increase in the noise level. Mechanism of Surface Finish ProductionThere are basically five mechanisms which contribute to the production of a surface which have been machined. These are:(l) The basic geometry of the cutting process. In, for example, single point turning the tool will advance a constant distance axially per revolution of the workpiecc and the resultant surface will have on it, when viewed perpendicularly to the direction of tool feed motion, a series of cusps which will have a basic form which replicates the shape of the tool in cut.(2) The efficiency of the cutting operation. It has already been mentioned that cutting with unstable built-up-edges will produce a surface which contains hard built-up-edge fragments which will result in a degradation of the surface finish. It can also be demonstrated that cutting under adverse conditions such as apply when using large feeds small rake angles and low cutting speeds, besides producing conditions which lead to unstable built-up-edge production, the cutting process itself can become unstable and instead of continuous shear occurring in the shear zone, tearing takes place, discontinuous chips of uneven thickness are produced, and the resultant surface is poor. Thissituation is particularly noticeable when machining very ductile materials such as copper and aluminum.(3) The stability of the machine tool. Under some combinations of cutting conditions; workpiece size, method of clamping ,and cutting tool rigidity relative to the machine tool structure, instability can be set up in the tool which causes it to vibrate. Under some conditions this vibration will reach and maintain steady amplitude whilst under other conditions the vibration will built up and unless cutting is stopped considerable damage to both the cutting tool and workpiece may occur. This phenomenon is known as chatter and in axial turning is characterized by long pitch helical bands on the workpiece surface and short pitch undulations on the transient machined surface.(4)The effectiveness of removing swarf. In discontinuous chip production machining, such as milling or turning of brittle materials, it is expected that the chip (swarf) will leave the cutting zone either under gravity or with the assistance of a jet of cutting fluid and that they will not influence the cut surface in any way. However, when continuous chip production is evident, unless steps are taken to control the swarf it is likely that it will impinge on the cut surface and mark it. Inevitably, this marking besides looking.(5)The effective clearance angle on the cutting tool. For certain geometries of minor cutting edge relief and clearance angles it is possible to cut on the major cutting edge and burnish on the minor cutting edge. This can produce a good surface finish but, of course, it is strictly a combination of metal cutting and metal forming and is not to be recommended as a practical cutting method. However, due to cutting tool wear, these conditions occasionally arise and lead to a marked change in the surface characteristics.Limits and TolerancesMachine parts are manufactured so they are interchangeable. In other words, each part of a machine or mechanism is made to a certain size and shape so will fit into any other machine or mechanism of the same type. Tomake the part interchangeable, each individual part must be made to a size that will fit the mating part in the correct way. It is not only impossible, but also impractical to make many parts to an exact size. This is because machines are not perfect, and the tools become worn. A slight variation from the exact size is always allowed. The amount of this variation depends on the kind of part being manufactured. For examples part might be made 6 in. long with a variation allowed of 0.003 (three-thousandths) in. above and below this size. Therefore, the part could be 5.997 to 6.003 in. and still be the correct size. These are known as the limits. The difference between upper and lower limits is called the tolerance.A tolerance is the total permissible variation in the size of a part.The basic size is that size from which limits of size arc derived by the application of allowances and tolerances.Sometimes the limit is allowed in only one direction. This is known as unilateral tolerance.Unilateral tolerancing is a system of dimensioning where the tolerance (that is variation) is shown in only one direction from the nominal size. Unilateral tolerancing allow the changing of tolerance on a hole or shaft without seriously affecting the fit.When the tolerance is in both directions from the basic size it is known as a bilateral tolerance (plus and minus).Bilateral tolerancing is a system of dimensioning where the tolerance (that is variation) is split and is shown on either side of the nominal size. Limit dimensioning is a system of dimensioning where only the maximum and minimum dimensions arc shown. Thus, the tolerance is the difference between these two dimensions.Surface Finishing and Dimensional ControlProducts that have been completed to their proper shape and size frequently require some type of surface finishing to enable them tosatisfactorily fulfill their function. In some cases, it is necessary to improve the physical properties of the surface material for resistance to penetration or abrasion. In many manufacturing processes, the product surface is left with dirt .chips, grease, or other harmful material upon it. Assemblies that are made of different materials, or from the same materials processed in different manners, may require some special surface treatment to provide uniformity of appearance.Surface finishing may sometimes become an intermediate step processing. For instance, cleaning and polishing are usually essential before any kind of plating process. Some of the cleaning procedures are also used for improving surface smoothness on mating parts and for removing burrs and sharp corners, which might be harmful in later use. Another important need for surface finishing is for corrosion protection in a variety of: environments. The type of protection procedure will depend largely upon the anticipated exposure, with due consideration to the material being protected and the economic factors involved.Satisfying the above objectives necessitates the use of main surface-finishing methods that involve chemical change of the surface mechanical work affecting surface properties, cleaning by a variety of methods, and the application of protective coatings, organic and metallic.In the early days of engineering, the mating of parts was achieved by machining one part as nearly as possible to the required size, machining the mating part nearly to size, and then completing its machining, continually offering the other part to it, until the desired relationship was obtained. If it was inconvenient to offer one part to the other part during machining, the final work was done at the bench by a fitter, who scraped the mating parts until the desired fit was obtained, the fitter therefore being a 'fitter' in the literal sense. J It is obvious that the two parts would have to remain together, and m the event of one having to be replaced, the fitting would have to be done all over again. Inthese days, we expect to be able to purchase a replacement for a broken part, and for it to function correctly without the need for scraping and other fitting operations.When one part can be used 'off the shelf' to replace another of the same dimension and material specification, the parts are said to be interchangeable.A system of interchangeability usually lowers the production costs as there is no need for an expensive, 'fiddling' operation, and it benefits the customer in the event of the need to replace worn parts.Automatic Fixture DesignTraditional synchronous grippers for assembly equipment move parts to the gripper centre-line, assuring that the parts will be in a known position after they arc picked from a conveyor or nest. However, in some applications, forcing the part to the centre-line may damage cither the part or equipment. When the part is delicate and a small collision can result in scrap, when its location is fixed by a machine spindle or mould, or when tolerances are tight, it is preferable to make a gripper comply with the position of the part, rather than the other way around. For these tasks, Zaytran Inc. Of Elyria, Ohio, has created the GPN series of non- synchronous, compliant grippers. Because the force and synchronizations systems of the grippers are independent, the synchronization system can be replaced by a precision slide system without affecting gripper force. Gripper sizes range from 51b gripping force and 0.2 in. stroke to 40Glb gripping force and 6in stroke. GrippersProduction is characterized by batch-size becoming smaller and smaller and greater variety of products. Assembly, being the last production step, is particularly vulnerable to changes in schedules, batch-sizes, and product design. This situation is forcing many companies to put more effort into extensive rationalization and automation of assembly that was previouslyextensive rationalization and automation of assembly that was previously the case. Although the development of flexible fixtures fell。
中英文中英文文献翻译-关于数控车床和换刀系统
英文原文On the NC lathe and tool changing systemCNC machine tool numerical control machine tools (Computer numerical control machine tools) abbreviation, is provided with a program control system of automatic machine tools. The logic control system can deal with the control code or other symbolic instruction specified program, and decoding the digital code, said information carrier, through the numerical control device input. After processing by CNC device control signals, control the machine movements, by drawing the shape and size requirements, will be automatically processed by the parts.Features: CNC machine tool operation and monitoring of all completed in the numerical control unit, it is the brain of CNC machine tools. Compared with the general machine tools, CNC machine tools has the following characteristics:● the processing object adaptability, adapt to the characteristics of mold products such as a single production, provide the appropriate processing method for die and mould manufacturing;● high machining accuracy, processing with stable quality;● can coordinate linkage, processing complex shape parts;● machining parts change, only need to change the program, can save the preparation time of production;● the machine itself high precision, rigi dity, can choose the amount of processing good, high productivity (typically 3 to 5 times that of ordinary machine tool);The machine is a high degree of automation, reducing labor intensity;● conducive to the production management modernization. The use of CNC machine tools and the standard code of digital information processing, information transmission, the use of computer control method, has laid the foundation for the integration of computer aided design, manufacturing and management;● on the operato rs of higher quality, higher demands for the repair of the technical staff;● high reliability.Composition: CNC machine tools in general by the input medium, man-machine interactive equipment, CNC equipment, feed servo drive system, spindle servo drive system, the auxiliary control device, feedback apparatus and adaptive control device etc.. [4] in NC machining, NC milling processing is the most complex, need to solve most problems. NC programming of NC line in addition to CNC milling, cutting, CNC EDM, CNC lathe, CNC grinding, each with its own characteristics, servo system is the role of the motion signal is converted into the machine moving parts from the numerical control device of pulse. Concrete has the following parts: the structure of CNC machine tools.Driver: he is driving parts of CNC machine tools, actuator, including spindle drive unit, feeding unit, spindle motor and feed motor. He through the electric or electro-hydraulic servo system to realize the spindle and feed drive under the control of numerical control device. When several feed linkage, can complete the positioning, processing line, plane curve and space curve.The main performance(1) the main dimensions.(2) the spindle system.(3) feed system.(4) tool system.(5) electrical. Including the main motor, servo motor specifications and power etc..(6) cooling system. Including the cooling capacity, cooling pump output.(7) dimensions. Expressed as length * width * height.Development trend of CNC lathe:High speed, precision, complex, intelligent and green is the general trend in the development of CNC machine tool technology, in recent years, made gratifying achievements in practicality and industrialization. Mainly in the:1 machine tool composite technology to further expand with the CNC machine tool technology, composite processing technology matures, including milling - car compound, car milling compound, car - boring - drill - gear cutting compound, composite grinding, forming, composite processing, precision and efficiency of machining is greatly improved. "One machine is a processing factory", "one card, complete processing" concept is being accepted by more people, the development of compound processing machine tool is the trend of diversified.Intelligent technology 2 CNC machine tools have a new breakthrough, in the performance of NC system has been reflected more. Such as: automatically adjust the interference anti-collision function, after the power of workpiece automatically exit safety power-off protection function, machining parts detection and automatic compensation function of learning, high precision machining parts intelligent parameter selection function, process automatic elimination of machine vibration functions into the practical stage, intelligent upgrade the function of machine and quality.The 3 robots enable flexible combination of flexible combination of higher efficiency of robot and the host are widely used, make flexible line more flexible, extending the function, flexible line shorten further, more efficient. Robot and machining center, milling composite machine, grinder, gear processing machine tool, tool grinding machine, electric machine, sawing machine, punching machine, laser cutting machine, water cutting machine etc. various forms of flexible unit and flexible production line has already begun the application.4 precision machining technology has the machining precision of CNC metal cutting machine tools from the yarn in the original (0.01mm) up to micron level (0.001mm), some varieties has reached about 0.05 μ M. Micro cutting and grinding machining of ultra precision CNC machine tools, precision can reach about 0.05 μ m, shape precision can reach about 0.01 μ M. Special processing precision by using optical, electrical, chemical, energy can reach nanomete r level (0.001 μ m). By optimizing the design of machine tool structure, machine tool parts of ultra precision machining and precision assembly, using high precision closed loop control and temperature, vibration and other dynamic error compensation technology, improve the geometric accuracy of machine tool processing, reduce the shape of error, surface roughness, and into the submicron, nano super finishing tiThe 5 functional component to improve the performance of functional components are at a high speed,high precision, high power and intelligent direction, and obtain the mature application. A full digital AC servo motor and drive device, high technology content of the electric spindle, linear motor, torque motor, linear motion components with high performance, application of high precision spindle unit and other function parts, greatly improving the technical level of CNC machine tools.The feed drive system of CNC lathe:Effect of feed drive system,The feed drive system of CNC machine tools will be received pulse command issued by the numerical control system, and the amplification and conversion machine movements carry the expected movement.Two, the feeding transmission system requirementsIn order to guarantee the machining accuracy of NC machine tool is high, the feed drive system of transmission accuracy, sensitivity high (fast response), stable work, high stiffness and friction and inertia small, service life, and can remove the transmission gap.Category three, feed drive system1, stepping motor servo systemGenerally used for NC machine tools.2, DC servo motor servo systemPower is stable, but because of the brush, the wear resulting in use need to change. Generally used for middle-grade CNC machine tools.3, AC servo motor servo systemThe application is extremely widespread, mainly used in high-end CNC machine tools.4, the linear motor servo systemNo intermediate transmission chain, high precision, the feed speed, no length limit; but the poor heat dissipation, protection requirements are particularly high, mainly used for high-speed machine.Driving component four, feed system1, the ball screw nut pairNC machining, the rotary motion into linear motion, so the use of screw nut transmission mechanism. NC machine tools are commonly used on the ball screw, as shown in Figure 1-25, it can be a sliding friction into rolling friction, meet the basic requirements of the feed system to reduce friction. The transmission side of high efficiency, small friction, and can eliminate the gap, no reverse air travel; but the manufacturing cost is high, can not lock, size is not too big, generally used for linear feed in small CNC machine tool.2, rotary tableIn order to expand the scope of the process of NC machine tools, CNC machine tools in addition to make linear feed along the X, Y, Z three coordinate axes, often also need a circumferential feed movement around Y or Z axis. Circular feed motion of CNC machine tools in general by the rotary table to realize, for machining center, rotary table has become an indispensable part of.Rotary table of commonly used CNC machine tools in the indexing table and NC rotary table.(1) indexing tableIndexing table can only finish dividing movement, not circular feed, it is in accordance with theinstructions in the NC system, when indexing will work together with the workpiece rotation angle. When indexing can also use manual indexing. Provisions of indexing table is generally only rotary angle (such as 90, 60 and 45 degree).(2) NC rotary tableNC rotary table appearance similar to the indexing table, but the internal structure and function is not the same. The main function of the NC rotary table is based on the numerical control device sends command pulse signal, complete circumferential feed movement, various arc processing and surface processing, it can also be graduation work.3, guideRail is an important part of feed drive system, is one of the basic elements of the structure of machine tool, rigidity, precision and accuracy of NC machine tool which determines to a large extent retention. At present, guide the NC machine tool are sliding rail, rolling guideway and hydrostatic guideway.(1) sliding guideSliding guide rail has the advantages of simple structure, easy manufacture, good stiffness, vibration resistance and high performance, widely used in CNC machine tools, the use of most metal plastic form, known as the plastic guide rail, as shown in figure 1-26.On characteristics of the plastic sliding guide: friction characteristic is good, good wear resistance, stable movement, good manufacturability, low speed.(2) rolling guideRolling guide is placed in the rail surface between the ball, roller or needle roller, roller, the rolling friction instead of sliding surface of the guide rail between wipe.Rolling guide rail and the sliding rail, high sensitivity, small friction coefficient, and the dynamic, static friction coefficient is very small, so the motion is uniform, especially in the low speed movement, the stick-slip phenomenon is not easy to occur; high posit ioning accuracy, repeatability positioning accuracy is up to 0.2 μ m; traction force is small, wear small, portable in movement; good precision, long service life. But the vibration of rolling guide, high requirements on protection, complicated structure, difficult manufacture, high cost Automatic tool changer:One, the function of automatic tool changerAutomatic tool changing device can help save the auxiliary time of CNC machine tools, and meet in an installation completed procedure, step processing requirements.Two, on the requirement of automatic tool changerNumerical control machine tool for automatic tool changer requirement is: tool change quickly, time is short, high repetitive positioning accuracy, tool storage capacity is sufficient, small occupation space, stable and reliable work.Three, change the knife form1, rotary cutter replacementIts structure is similar to the ordinary lathe turret saddle, according to the processing of different objects can be designed into square or six angle form, consists of the NC system sends out the instruction to the rotarycutter.2, the replacement of the spindle head tool changeThe spindle head pre-loaded required tools, in order to machining position, the main motor is switched on, drives the cutter to rotate. The advantage of this method is that eliminates the need for automatic clamping, cutting tool, clamping and cutting tool moving and a series of complex operation, reduce tool change time, improve the reliability of the tool change.3, the use of changing toolThe processing required tools are respectively arranged in the standard tool, adjust the size of the machine after certain way add to the knife, the exchange device from the knife and the spindle take knife switch.Four, the tool switching deviceAutomatic tool change device, device for knife library and the main shaft transmission and handling tool for tool exchange device. Tool exchange often have two kinds: mechanical hand tool exchange and by relative motion of knife and machine tool spindle exchange tool (cutter to the spindle tool change or movement of the spindle to the knife knife tool change position), the mechanical hand tool change is most common.Five, the knifeThe knife is one of the most important parts in automatic tool changer, have great influence on the overall design of NC machine tool and its capacity, layout and structure.1, the capacity of the tool storageA number of knife inventory cutters, generally depending on the processing requirements. The capacity of small knife, can not meet the processing needs; capacity is too large, will make the knife database size, covers an area of large, tool selection process for a long time, and the knife library utilization rate is low, the structure is too complex, causing great waste.2, the knife typeGenerally, the chain disc and drum type knife several.Disc cutter tool was circular arrangement, low utilization of space, size is not large but simple structure.Chain magazine compact structure, large capacity, link shape can also be random bed made of various forms and flexible layout, but also will change the cutter location prominent for tool change, widely used.Drum type or lattice type knife, covers an area of small, compact structure, large capacity, but cutter selection, tool movements are complicated, for centralized knife system for FMS.3, tool selectionOften order tool selection and random selection tool two.The order of tool selection is before processing, the processing required tools to process sequence of insert knife knife, order not wrong, processing adjust knife in order. The work piece changes, the need to reset the tool sequence, the operation is simple, and the processing tool with a workpiece can not be repeated use.A knife is the cutting tool has its own code, optional and can be repeatedly used in processing, also do not put in the fixed knife, knife, the knife is convenient.Technology file is the guiding file workers during processing, process scheme is reasonable, not only affect the efficiency of NC machining, and will directly affect the machining quality. Therefore, before NCprogramming, NC machining process follows the process of certain principles and combined with the characteristics of CNC lathe seriously and develop in detail the good parts.In the CNC lathe processing parts, should according to the principle of dividing process concentrated, in a fixture as far as possible to complete the most or even all of the surface processing. Part positioning, according to the structure of different shapes, usually cylindrical, face or end clamping, and strive to design basis, process reference and programming the unification datum.The main contents are: analysis of NC machining technology of part drawings, clear processing content; determination method, workpiece on lathe the surface processing sequence and tool feed line and cutting tools, fixtures and cutting the amount of choice.Analysis, part drawing processIn the machining process planning of parts, first of all to carry on in-depth analysis to the processing object. For NC turning process should consider the following aspects:1 reading part drawing, analysis of geometric conditions of part contourIn turning process of manual programming, to calculate each node coordinates; in automatic programming, to define the components outline all geometric elements. Therefore, in the analysis of parts should pay attention to:Parts of the map is missing a dimension, the geometric conditions are not sufficient to constitute the part outline, influence;Map location map parts of the ambiguity or dimension is not clear, so that the program can't start;The part drawing geometry given is not reasonable, resulting in mathematical difficulties.The part drawing dimensioning methods should adapt to the characteristics of CNC lathe processing, should size or directly given coordinate dimension with the same standard.2 dimensional accuracy requirementsAnalysis of the pattern of parts size precision requirements, to determine whether achieve the turning process, and determine the process method to control the dimension precision. In the analysis process, but also can convert some dimensions such as size, incremental and absolute size and dimension chain calculation. In the use of NC lathe turning parts, average value of components often required size and maximum and minimum limit of size size as the basis of programming.3 shape and position accuracy requirementsPattern of parts tolerance of shape and location given is important foundation to ensure the parts precision. When machining parts, to determine the location reference and measurement reference according to the requirements, can also carry out some technical processing according to the special needs of CNC lathe parts, in order to control effectively the shape and position accuracy.4 requirements of surface roughnessSurface roughness is an important requirement of micro precision parts of the surface, but also the reasonable selection of NC lathe, cutting tools and cutting the amount determined on the basis of.5 material and heat treatment requirementsThe part drawing on material and heat treatment given requirements, is the choice of cutter, CNC lathe,cutting the amount determined on the basis of model.Automatic tool changing system is mainly to process the required tools, transmitted to the spindle clamping mechanism from the knife. A TC system by knife library, manipulator, which consists of a driving system. Basic requirements: tool 1 short change time 2 tool with high repeat positioning accuracy of 3 sufficient storage capacity of 4 knife library covers an area of small (compact) 5 safe and reliable.The knife is a knife storage device provides the required automatic machining process and tool changing needs; the automatic tool change mechanism and can put the tool storage of the knife. Controlled by the computer program, can complete a variety of machining different needs, such as milling, drilling, boring, tapping etc.. Shorten the process, reduce the production cost.The knife is a knife storage location, and according to the control program, to determine the correct tool to position, to exchange tool; tool change mechanism is the implementation of tool exchange action. The knife must exist at the same time and tool change mechanism, if no knife library processing required tools can't reserve; without tool change mechanism, then the processing required tools not knife Kuyi order replacement, and reduce non-cutting time to lose.Rotary motion of the knife is composed of a three-phase asynchronous motor with brake of the power source, the three-phase power supply through the AC contactor is supplied to the motor brake open, then the knife library operation, cut off the three-phase power supply brake locking, knife immediately stop running. Through the logical combination of indexing disk motion and related test element group, can make each Daotao accurate stop at the tool change position. Knife stopped at the tool change position, controlled by the cylinder sleeve in horizontal or vertical state, to facilitate mechanical hand for the knife, knife indexing table can be clockwise or counterclockwise rotation, which can search in the shortest possible time to the tool to change. The driving system of NC machine tool automatic tool changing system with hydraulic mechanism, pressure mechanism, electric cam mechanism. Nowadays the cam tool changer is used widely. Really fast, but no other consumable parts and maintenance requirements change, the failure rate at least, life of more than one million times. Speed changer system for rapid automatic tool changing technology is mainly aimed to reduce the processing time, the comprehensive consideration of various factors of machine tools, complete the technical method of tool exchange in the shortest possible time. The machine has the following features: 1 knife arm is short 2 knife arm is not necessarily linear 3 two knife may mutually perpendicular 4 cam box is small and mobile. Its main purpose is to let the knife, the movable parts of small moment of inertia, in order to achieve the purpose of quick change knife. Foundation to improve the automatic changing device in the traditional method of knife cutter changing speed of increase movement speed, or the mechanism action faster and a driving element. For example, change the knife speed mechanical cam structure is higher than that of hydraulic and pneumatic structure. According to the high speed machine tool structure design of knife and the knife changing device of form and position. For example, the knife machine tools and tool replacing device installed at the side of an upright post, in the high speed machine tool is more feeding movable column, in order to reduce the mass of the moving parts, the knife and tool replacing device should not be installed on the upright post. The formation of the optimal cutting parameters. Machining and turning centers is composed of mechanical equipment and CNC system, high efficiency, high precision of automatic machine for machiningof complex parts. This machine can be installed several knife, automatic tool change, installed in a card, to complete the milling, boring, vehicle processing, drilling, expansion joints, tapping. The reason why this kind of processing capacity, it is because it has a set of automatic tool changer. Automatically switch to the device in a variety of forms, is the main component of the knife, a manipulator and a driving device, although the tool change, tool selection, tool storage structure, mechanical hand types are different, but all is in the numerical control device and the programmable controller control, by the motor or hydraulic or pneumatic actuator driven knife base and the manipulator and the exchange tool selection. We refer to this as continuous processing to achieve a variety of process, the processing center or turning center, device selection and exchange for tool called automatic knife device (automatic tool change ATC). The main part of ATC is the knife, a manipulator and a driving device. The knife is the function of storage tool and knife next to be used accurately to the tool change position, in exchange for tool changing manipulator to complete the old and new tool. When the tool storage capacity is large, often far away from the main configuration and integral movement is not easy, it needs between the spindle and the tool library configuration tool change mechanism to perform the action of changing knife.The manipulator assembly is the current research focus, foreign study used camera and a force sensor and a microcomputer connected together, can identify the parts of the range to reach the aim of inlaid. At present the industry manipulator is mainly used for machining, casting, heat treatment, regardless of the number, variety and performance still can not meet the needs of industrial development. The main is to gradually expand the scope of application, mechanical hand to focus on the development of casting, heat treatment, in order to reduce labor intensity, improve working conditions, the application of special mechanical hand at the same time, the development of general machinery corresponding hand, has the condition to develop teaching manipulator, computer control of manipulator and the combination of manipulator. The motion of the manipulator components, such as expansion, swing, lifting, shifting, pitch mechanism and a clamping mechanism of different types according to the design into a common mechanism, typical, so according to the different requirements of different types of clamping mechanism, can form different manipulator path. Both for the design and manufacture, is convenient for the replacement of the workpiece, expand the scope of application. At the same time to improve speed, reduce the impact, correct positioning, in order to better play the role of manipulator. In addition to research on servo type, memory reappearance type, as well as with tactile, visual properties such as mechanical hand, and consider the connected with computer, and gradually become a basic unit of the whole machinery manufacturing system. In the mechanical manufacturing industrial manipulator is used more, faster development. Now mainly used for machine, horizontal forging press feeding and discharging, and spot welding, paint spraying operations, which can be used to complete the operation in advance in accordance with the specified procedure. In addition, the development trend of foreign manipulator is developing manipulator has some kind of intelligence. It has the ability to change sensor, can feedback to external conditions, make corresponding changes. Such as the location of a deviation, which can correct and self detection, focus on visual function and tactile function research. At present, have made certain achievements. Visual function is mounted on a manipulator has a TV camera and optical rangefinder (i.e. distance sensor) and micro computer. Work is a television camera will object image into the video signal, andthen sent to the computer, in order to analyze the types of objects, size, color and location, and sends out the instruction to control the manipulator to work. Tactile function is tactile feedback control device is mounted on a manipulator. When the mechanical hand first finger to find work, produce the tactile effect through the pressure sensitive element is arranged on the finger, and then into the front, seize the workpiece. Hand grasping force control through the sensitive element is arranged on the finger, to achieve automatic adjustment grip size. In short, as the capacity of assembly work development of mechanical sensing technology will also further improve the hand. More important is the manipulator, the flexible manufacturing system and flexible manufacturing unit combination, so as to fundamentally change the current manufacturing system operation state.中文译文关于数控车床和换刀系统数控机床是数字控制机床（Computer numerical control machine tools）的简称，是一种装有程序控制系统的自动化机床。
数控技术类外文文献翻译、中英文翻译、外文翻译
外文原文：NC Technology1、Research current situation of NC lathe in our timesResearch and development process to such various kinds of new technologies as numerical control lathe , machining center , FMS , CIMS ,etc. of countries all over the world, linked to with the international economic situation closely. The machine tool industry has international economy to mutually promote and develop, enter 21 alert eras of World Affairs, the function that people's knowledge plays is more outstanding, and the machine tool industry is regarded as the foundation of the manufacturing industry of the machine, its key position and strategic meaning are more obvious. Within 1991-1994 years, the economic recession of the world, expensive FMS, CIMS lowers the temperature, among 1995-2000 years, the international economy increases at a low speed, according to requisition for NC lathe and the world four major international lathes exhibition in order to boost productivity of users of various fields of present world market (EMO , IMTS , JIMTOF , China CIMT of Japan of U.S.A. of Europe), have the analysis of the exhibit, there are the following several points mainly in the technical research of NC lathe in our times:（1）、Pay more attention to new technology and innovationWorldwide , are launching the new craft , new material , new structure , new unit , research and development of the new component in a more cost-effective manner, developmental research of for instance new cutter material , the new electric main shaft of main shaft structure , high speed , high-speed straight line electrical machinery ,etc.. Regard innovating in improvement of the processing technology as the foundation, for process ultra and hard difficult to cut material and special composite and complicated part , irregular curved surface ,etc. research and develop new lathe variety constantly.（2）、Improve the precision and research of machine toolingIn order to improve the machining accuracy of the machining center, are improving rigidity of the lathe, reduction vibration constantly, dispel hotly and out of shape, reduce the noise , improve the precision of localization of NC lathe, repeat precision, working dependability , stability , precision keeping, world a lot of country carry on lathe hot error , lathe sport and load out of shape software of error compensate technical research, take precision compensate, software compensate measure improve , some may make this kind of error dispel 60% already. And is developing retrofit constantly, nanometer is being processed.（3）、Improve the research of the machine tooling productivityWorld NC lathe, machining center and corresponding some development of main shaft, electrical machinery of straight line, measuring system, NC system of high speed, under the prerequisite of boosting productivity.（4）、What a lot of countries have already begun to the numerical control system melt intelligently, openly, study networkedlyA、Intelligent research of the numerical control systemMainly showing in the following aspects: It is intelligent in order to pursue the efficiency of processing and process quality, the self-adaptation to the processing course is controlled, the craft parameter produces research automatically; Join the convenient one in order to improve the performance of urging and use intelligently, to the feedback control, adaptive operation , discerning automatically load selects models automatically, since carries on research whole definitely ,etc. of the electrical machinery parameter; There are such research of the respect as intelligent automatic programming , intelligent man-machine interface , intelligence diagnosing , intelligent monitoring ,etc..B、The numerical control system melts and studies openMainly showing in the following aspects: The development of the numerical control system is on unified operation platform, face the lathe producer and support finally, through changing, increasing or cutting out the structure target(numerical control target ), form the seriation, and can use users specially conveniently and the technical know-how is integrated in the control system, realize the open numerical control system of different variety, different grade fast, form leading brand products with distinct distinction. System structure norm of the open numerical control system at present, norm, disposing the norm, operation platform, numerical control systematic function storehouse and numerical control systematic function software developing instrument, etc. are the core of present research to pass through.C、Meeting the manufacture system of the production line , demand for the information integration of the manufacturing company networkedly greatly of numerical control equipment, it is a basic unit of realizing the new manufacture mode too.2、Classification of the machining center（1）Process according to main shaft space position when it classifies to be as follows, horizontal and vertical machining center.Horizontal machining center, refer to the machining center that the axis level of the main shaft is set up. Horizontal machining center for 3-5 sport coordinate axis, acommon one three rectilinear motion coordinate axis and one turn the coordinate axis of sports round (turn the working bench round), it can one is it is it finish other 4 Taxi processing besides installing surfaces and top surfaces to insert to install in work piece, most suitable for processing the case body work piece. Compared with strength type machining center it, the structure is complicated, the floor space is large, quality is large, the price is high.Vertical machining center, the axis of the main shaft of the vertical machining center, in order to set up vertically, its structure is mostly the regular post type, the working bench is suitable for processing parts for the slippery one of cross, have 3 rectilinear motion coordinate axis generally, can find a room for one horizontal numerical control revolving stage (the 4th axle) of axle process the spiral part at working bench. The vertical machining center is of simple structure, the floor space is small, the price is low, after allocating various kinds of enclosures, can carry on the processing of most work pieces.Large-scale gantry machining center, the main shafts are mostly set up vertically, is especially used in the large-scale or with complicated form work piece , is it spend the many coordinate gantry machining center to need like aviation , aerospace industry , some processing of part of large-scale steam turbine.Five machining centers, this kind of machining center has function of the vertical and horizontal machining center, one is it after inserting, can finish all five Taxi processing besides installing the surface to install in work piece, the processing way can make form of work piece error lowest, save 2 times install and insert working, thus improve production efficiency, reduce the process cost.（2）Classify by craft useIs it mill machining center to bore, is it mill for vertical door frame machining center, horizontal door frame mill the machining center and Longmen door frame mill the machining center to divide into. Processing technology its rely mainly on the fact that the door frame is milled, used in case body, shell and various kinds of complicated part special curve and large processes , curved surface of outline process, suitable for many varieties to produce in batches small.Complex machining center, point five times and compound and process mainly, the main shaft head can be turned round automatically, stand, lie and process, after the main shaft is turned round automatically, realize knowing that varies in the horizontal and vertical direction.（3）Classify by special functionSingle working bench, a pair of working bench machining center;Single axle, dual axle, three axle can change machining center, main shaft of case;Transfer vertically to the tower machining center and transfer;One hundred sheets of storehouses adds the main shaft and changes one one hundred sheets of machining centers;One hundred sheets of storehouses connects and writes hands to add the main shaft and change one hundred sheets of machining centers;One hundred sheets of storehouses adds the manipulator and adds one pair of main shafts to transfer to the tower machining center.3、Development trend of the current numerical control latheAt present, the advanced manufacturing technology in the world is rising constantly, such application of technology as ultrafast cutting , ultraprecision processing ,etc., the rapid development of the flexible manufacturing system and integrated system of the computer one is constant and ripe, have put forward higher demand to the process technology of numerical control. Nowadays the numerical control lathe is being developed in several following directions.（1）. The speed and precision at a high speed , high accuracy are two important indexes of the numerical control lathe, it concerns directly that processes efficiency and product quality. At present, numerical control system adopt-figure number, frequency high processor, in order to raise basic operation speed of system. Meanwhile, adopt the super large-scale integrated circuit and many microprocessors structure, in order to improve systematic data processing ability, namely improve and insert the speed and precision of mending operation. Adopt the straight line motor and urge the straight line of the lathe working bench to be servo to enter to the way directly, it is quite superior that its responds the characteristic at a high speed and dynamically. Adopt feedforward control technology, make it lag behind error reduce greatly, thus improve the machining accuracy cut in corner not to track.For meet ultrafast demand that process, numerical control lathe adopt main shaft motor and lathe structure form that main shaft unite two into one, realize frequency conversion motor and lathe main shaft integrate , bearing , main shaft of electrical machinery adopt magnetism float the bearing , liquid sound pigeonhole such forms as the bearing or the ceramic rolling bearing ,etc.. At present, ceramic cutter and diamond coating cutter have already begun to get application.（2）. Multi-functional to is it change all kinds of machining centers of organization (a of capacity of storehouse can up to 100 of the above ) automatically tofurnished with, can realize milling paring , boring and pares , bores such many kinds of processes as paring , turning , reaming , reaming , attacking whorl ,etc. to process at the same time on the same lathe , modern numerical control lathe adopt many main shaft , polyhedron cut also , carry on different cutting of way process to one different position of part at the same time. The numerical control system has because adopted many CPU structure and cuts off the control method in grades, can work out part processing and procedure at the same time on a lathe, realize so-called "the front desk processes, the backstage supporter is an editor ". In order to meet the needs of integrating the systematic one in flexible manufacturing system and computer, numerical control system have remote serial interface , can network , realize data communication , numerical control of lathe, can control many numerical control lathes directly too.（3）. Intelligent modern numerical control lathe introduce the adaptive control technology, according to cutting the change of the condition, automatic working parameter, make the processing course can keep the best working state , thus get the higher machining accuracy and roughness of smaller surface , can improve the service life of the cutter and production efficiency of the equipment at the same time . Diagnose by oneself, repair the function by oneself, among the whole working state, the system is diagnosed, checked by oneself to CNC system and various kinds of equipment linking to each other with it at any time. While breaking down, adopt the measure of shutting down etc. immediately, carry on the fault alarm, brief on position, reason to break down, etc.. Can also make trouble module person who take off automatically, put through reserve module ,so as to ensure nobody demand of working environment. For realize high trouble diagnose that requires, its development trend adopts the artificial intelligence expert to diagnose the system.（4）.Numerical control programming automation with the development of application technology of the computer, CAD/CAM figure interactive automatic programming has already get more application at present, it is a new trend of the technical development of numerical control. It utilize part that CAD draw process pattern , is it calculate the trailing punishing to go on by cutter orbit data of computer and then, thus produce NC part and process the procedure automatically, in order to realize the integration of CAD and CAM. With the development of CIMS technology , the full-automatic programming way in which CAD/CAPP/CAM integrates has appeared again at present, it, and CAD/CAM systematic programming great differencetheir programming necessary processing technology parameter needn't by artificial to participate in most, get from CAPP database in system directly.（5）. The dependability of the dependability maximization numerical control lathe has been the major indicator that users cared about most all the time. The numerical control system will adopt the circuit chip of higher integrated level, will utilize the extensive or super large-scale special-purpose and composite integrated circuit, in order to reduce the quantity of the components and parts, to improve dependability. Through the function software of the hardware, in order to meet various kinds of demands for controlling the function, adopt the module, standardization, universalization and seriation of the structure lathe noumenon of the hardware at the same time, make not only improve the production lot of the hardware but also easy to is it produce to organize and quality check on. Still through operating and starting many kinds of diagnostic programs of diagnosing, diagnosing, diagnosing off-line online etc. automatically, realize that diagnoses and reports to the police the trouble to hardware, software and various kinds of outside equipment in the system. Utilize the warning suggestion, fix a breakdown in time; Utilize fault-tolerant technology, adopt and design the important part " redundantly ", in order to realize the trouble resumes by oneself; Utilize various kinds of test, control technology, excess of stroke, knife damages, interfering, cutting out, etc. at the time of various kinds of accidents as production, carry on corresponding protection automatically.（6）. Control system miniaturization systematic miniaturization of numerical control benefit and combine the machine, electric device for an organic whole. Adopt the super large-scale integrated component , multi-layer printed circuit board mainly at present, adopt the three-dimensional installation method , make the electronic devices and components must use the high density to install, narrow systematic occupying the space on a larger scale. And utilize the new-type slim display of colored liquid crystal to substitute the traditional cathode ray tube, will make the operating system of numerical control miniaturize further. So can install it on the machine tool conveniently, benefit the operation of the numerical control lathe correctly even more.本文出自：Shigley J E. Mechanical Engineering Design. New York: McGraw-Hill, 1998译文：数控技术1、当前世界NC机床的研究现状世界各国对数控机床、加工中心以至FMS、CIMS等各种新技术的研究与发展进程，是与世界经济形势紧密相连的。
数控机床外文文献翻译、中英文翻译
数控机床外文文献翻译、中英文翻译原文一CNC machine toolsOutdate, J. and Joe, J. Configuration Synthesis of Machining Centers with Tool，JohnWiley & sons, 2001While the specific intention and application for CNC machines vary from one machine type to another, all forms of CNC have common benefits. Here are but a few of the more important benefits offered by CNC equipment.The first benefit offered by all forms of CNC machine tools is improved automation. The operator intervention related to producing work pieces can be reduced or eliminated. Many CNC machines can run unattended during their entire machining cycle, freeing the operator to do other tasks. This gives the CNC user several side benefits including reduced operator fatigue, fewer mistakes caused by human error, and consistent and predictable machining time for each work piece. Since the machine will be running under program control, the skill level required of the CNC operator (related to basic machining practice) is also reduced as compared to a machinist producing work pieces with conventional machine tools.The second major benefit of CNC technology is consistent and accurate work pieces. T oday's CNC machines boast almost unbelievable accuracy and repeatability specifications. This means that once a program is verified, two, ten, or one thousand identical work pieces can be easily produced with precision and consistency.A third benefit offered by most forms of CNC machine toolsis flexibility. Since these machines are run from programs, running a different workpiece is almost as easy as loading a different program. Once a program has been verified and executed for one production run, it can be easily recalled the next time the workpiece is to be run. This leads to yet another benefit, fast change over. Since these machines are very easy to set up and run, and since programs can be easily loaded, they allow very short setup time. This is imperative with today's just-in-time (JIT) product requirements.Motion control - the heart of CNCThe most basic function of any CNC machine is automatic, precise, and consistent motion control. Rather than applying completely mechanical devices to cause motion as is required on most conventional machine tools, CNC machines allow motion control in a revolutionary manner2. All forms of CNC equipment have two or more directions of motion, called axes. These axes can be precisely and automatically positioned along their lengths of travel. The two most common axis types are linear (driven along a straight path) and rotary (driven along a circular path).Instead of causing motion by turning cranks and handwheels as is required on conventional machine tools, CNC machines allow motions to be commanded through programmed commands. Generally speaking, the motion type (rapid, linear, and circular), the axes to move, the amount of motion and the motion rate (federate) are programmable with almost all CNC machine tools.A CNC command executed within the control tells the drive motor to rotate a precise number of times. The rotation of the drive motor in turn rotates the ball screw.And the ball screw drives the linear axis (slide). A feedbackdevice (linear scale) on the slide allows the control to confirm that the commanded number of rotations has taken place3. Refer to fig.1.fig.1 typical drive system of a CNC machine toolThough a rather crude analogy, the same basic linear motion can be found on a common table vise. As you rotate the vise crank, you rotate a lead screw that, in turn, drives the movable jaw on the vise. By comparison, a linear axis on a CNC machine tool is extremely precise. The number of revolutions of the axis drive motor precisely controls the amount of linear motion along the axis.How axis motion is commanded - understanding coordinate systemsIt would be infeasible for the CNC user to cause axis motion by trying to tell each axis drive motor how many times to rotate in order to command a given linear motion amount4. (This would be like having to figure out how many turns of the handle on a table vise will cause the movable jaw to move exactly one inch!) Instead, all CNC controls allow axis motion to be commanded in a much simpler and more logical way by utilizing some form of coordinate system. The two most popular coordinate systems used with CNC machines are the rectangular coordinate system and the polar coordinate system. By far, the more popular of these two is the rectangular coordinate system.The program zero point establishes the point of reference for motion commands in a CNC program. This allows the programmer to specify movements from a common location. If program zero is chosen wisely, usually coordinates needed forthe program can be taken directly from the print.With this technique, if the programmer wishes the tool to be sent to a position one inch to the right of the program zero point, X1.0 is commanded. If the programmer wishes the tool to move to a position one inch above the program zero point, Y1.0 is commanded. The control will automatically determine how many times to rotate each axis drive motor and ball screw to make the axis reach the commanded destination point . This lets the programmer command axis motion in a very logical manner. Refer to fig.2, 3.fig.2, 3.Understanding absolute versus incremental motionAll discussions to this point assume that the absolute mode of programming is used6. The most common CNC word used to designate the absolute mode is G90. In the absolute mode, the end points for all motions will be specified from the program zero point. For beginners, this is usually the best and easiest method of specifying end points for motion commands. However, there is another way of specifying end points for axis motion.In the incremental mode (commonly specified by G91), endpoints for motions are specified from the tool's current position, not from program zero. With this method of commanding motion, the programmer must always be asking "How far should I move the tool?" While there are times when the incremental mode can be very helpful, generally speaking, this is the more cumbersome and difficult method of specifying motion and beginners should concentrate on using the absolute mode.Be careful when making motion commands. Beginners have the tendency to think incrementally. If working in the absolute mode (as beginners should), the programmer should always be asking "To what position should the tool be moved?" This position is relative to program zero, NOT from the tools current position.Aside from making it very easy to determine the current position for any command, another benefit of working in the absolute mode has to do with mistakes made during motion commands. In the absolute mode, if a motion mistake is made in one command of the program, only one movement will be incorrect. On the other hand, if a mistake is made during incremental movements, all motions from the point of the mistake will also be incorrect.Assigning program zeroKeep in mind that the CNC control must be told the location of the program zero point by one means or another. How this is done varies dramatically from one CNC machine and control to another8. One (older) method is to assign program zero in the program. With this method, the programmer tells the control how far it is from the program zero point to the starting position of the machine. This is commonly done with a G92 (or G50) command at least at the beginning of the program and possiblyat the beginning of each tool.Another, newer and better way to assign program zero is through some form of offset. Refer to fig.4. Commonly machining center control manufacturers call offsets used to assign program zero fixture offsets. Turning center manufacturers commonly call offsets used to assign program zero for each tool geometry offsets.fig.4 assign program zero through G54Flexible manufacturing cellsA flexible manufacturing cell (FMC) can be considered as a flexible manufacturing subsystem. The following differences exist between the FMC and the FMS:1.An FMC is not under the direct control of thecentral computer. Instead, instructions from the centralcomputer are passed to the cell controller.2.The cell is limited in the number of part families itcan manufacture.The following elements are normally found in an FMC:Cell controllerProgrammable logic controller (PLC)More than one machine toolA materials handling device (robot or pallet)The FMC executes fixed machining operations with parts flowing sequentially between operations.High speed machiningThe term High Speed Machining (HSM) commonly refers to end milling at high rotational speeds and high surface feeds. For instance, the routing of pockets in aluminum airframe sections with a very high material removal rate1. Refer to fig.5 for the cutting data designations and for mulas. Over the past 60 years, HSM has been applied to a wide range of metallic and non-metallic workpiece materials, including the production of components with specific surface topography requirements and machining of materials with hardness of 50 HRC and above. With most steel components hardened to approximately 32-42 HRC, machining options currently include:Fig.5 cutting datarough machining and semi-finishing of the material in its soft (annealed) condition heat treatment to achieve the final required hardness = 63 HRC machining of electrodes and Electrical Discharge Machining (EDM) of specific parts of dies and moulds (specifically small radii and deep cavities with limited accessibility for metal cutting tools) finishing and super-finishing of cylindrical/flat/cavity surfaces with appropriate cemented carbide, cermets, solid carbide, mixed ceramic or polycrystalline cubic boron nitride (PCBN)For many components, the production process involves acombination of these options and in the case of dies and moulds it also includes time consuming hand finishing. Consequently, production costs can be high and lead times excessive.It is typical in the die and mould industry to produce one or just a few tools of the same design. The process involves constant changes to the design, and because of these changes there is also a corresponding need for measuring and reverse engineering.The main criteria are the quality level of the die or mould regarding dimensional, geometric and surface accuracy. If the quality level after machining is poor and if it cannot meet the requirements, there will be a varying need of manual finishing work. This work produces satisfactory surface accuracy, but it always has a negative impact on the dimensional and geometric accuracy.One of the main aims for the die and mould industry has been, and still is, to reduce or eliminate the need for manual polishing and thus improve the quality and shorten the production costs and lead times.Main economical and technical factors for the development of HSMSurvivalThe ever increasing competition in the marketplace is continually setting new standards. The demands on time and cost efficiency is getting higher and higher. This has forced the development of new processes and production techniques to take place. HSM provides hope and solutions...MaterialsThe development of new, more difficult to machine materials has underlined the necessity to find new machining solutions.The aerospace industry has its heat resistant and stainless steel alloys. The automotive industry has different bimetal compositions, Compact Graphite Iron and an ever increasing volume of aluminum3. The die and mould industry mainly has to face the problem of machining high hardened tool steels, from roughing to finishing.QualityThe demand for higher component or product quality is the result of ever increasing competition. HSM, if applied correctly, offers a number of solutions in thisarea. Substitution of manual finishing is one example, which is especially important on dies and moulds or components with a complex 3D geometry.ProcessesThe demands on shorter throughput times via fewer setups and simplified flows (logistics) can in most cases, be solved by HSM. A typical target within the die and mould industry is to completely machine fully hardened small sized tools in one setup. Costly and time consuming EDM processes can also be reduced or eliminated with HSM.Design & developmentOne of the main tools in today's competition is to sell products on the value of novelty. The average product life cycle on cars today is 4 years, computers and accessories 1.5 years, hand phones 3 months... One of the prerequisites of this development of fast design changes and rapid product development time is the HSM technique.Complex productsThere is an increase of multi-functional surfaces on components, such as new design of turbine blades giving newand optimized functions and features. Earlier designs allowed polishing by hand or with robots (manipulators). Turbine blades with new, more sophisticated designs have to be finished via machining and preferably by HSM . There are also more and more examples of thin walled workpiece that have to be machined (medical equipment, electronics, defense products, computer parts).Production equipmentThe strong development of cutting materials, holding tools, machine tools, controls and especially CAD/CAM features and equipment, has opened possibilities that must be met with new production methods and techniques5.Definition of HSMSalomon's theory, "Machining with high cutting speeds..." on which, in 1931, took out a German patent, assumes that "at a certain cutting speed (5-10 times higher than in conventional machining), the chip removal temperature at the cutting edge will start to decrease...".See fig.6.Fig.6 chip removal temperature as a result of the cutting speedGiven the conclusion:" ... seems to give a chance to improve productivity in machining with conventional tools at high cutting speeds..."Modern research, unfortunately, has not been able to verifythis theory totally. There is a relative decrease of the temperature at the cutting edge that starts at certain cutting speeds for different materials.The decrease is small for steel and cast iron. But larger for aluminum and other non-ferrous metals. The definition of HSM must be based on other factors.Given today's technology, "high speed" is generally accepted to mean surface speeds between 1 and 10 kilometers perminute, or roughly 3 300 to 33 000 feet per minute. Speeds above 10 km/min are in the ultra-high speed category, and are largely the realm of experimental metal cutting. Obviously, the spindle rotations required to achieve these surface cutting speeds are directly related to the diameter of the tools being used. One trend which is very evident today is the use of very large cutter diameters for these applications - and this has important implications for tool design.There are many opinions, many myths and many different ways to define HSM. Maintenance and troubleshooting Maintenance for a horizontal MCThe following is a list of required regular maintenance for a Horizontal Machining Center as shown in fig.7. Listed are the frequency of service, capacities, and type of fluids required. These required specifications must be followed in order to keep your machine in good working order and protect your warranty.Fig. 7 horizontal machining centerDailyTop off coolant level every eight hour shift (especially during heavy TSC usage).Check way lube lubrication tank level.Clean chips from way covers and bottom pan.Clean chips from tool changer.Wipe spindle taper with a clean cloth rag and apply light oil.WeeklyCheck for proper operation of auto drain on filter regulator. See fig. 8Fig. 8 way lube and pneumaticsOn machines with the TSC option, clean the chip basket on the coolant tank.Remove the tank cover and remove any sediment inside the tank. Be careful to disconnect the coolant pump from the controller and POWER OFF the control before working on the coolant tank. Do this monthly for machines without the TSC option.Check air gauge/regulator for 85 psi.For machines with the TSC option, place a dab of grease on the V-flange of tools. Do this monthly for machines without the TSC option.Clean exterior surfaces with mild cleaner. DO NOT usesolvents.Check the hydraulic counterbalance pressure according to the machine's specifications.Place a dab of grease on the outside edge of the fingers of the tool changer and run through all tools".MonthlyCheck oil level in gearbox. Add oil until oil begins dripping from over flow tube at bottom of sump tank.Clean pads on bottom of pallets.Clean the locating pads on the A-axis and the load station. This requires removing the pallet.Inspect way covers for proper operation and lubricate with light oil, if necessary.Six monthsReplace coolant and thoroughly clean the coolant tank.Check all hoses and lubrication lines for cracking.AnnuallyReplace the gearbox oil. Drain the oil from the gearbox, and slowly refill it with 2 quarts of Mobil DTE 25 oil.Check oil filter and clean out residue at bottom for the lubrication chart.Replace air filter on control box every 2 years.Mineral cutting oils will damage rubber based components throughout the machine.TroubleshootingThis section is intended for use in determining the solution to a known problem. Solutions given are intended to give the individual servicing the CNC a pattern to follow in, first, determining the problem's source and, second, solving the problem.Use common senseMany problems are easily overcome by correctly evaluating the situation. All machine operations are composed of a program, tools, and tooling. You must look at all three before blaming one as the fault area. If a bored hole is chattering because of an overextended boring bar, don't expect the machine to correct the fault.Don't suspect machine accuracy if the vise bends the part. Don't claim hole miss-positioning if you don't first center-drill the hole.Find the problem firstMany mechanics tear into things before they understand the problem, hoping that it will appear as they go. We know this from the fact that more than half of all warranty returned parts are in good working order. If the spindle doesn't turn, remember that the spindle is connected to the gear box, which is connected to the spindle motor, which is driven by the spindle drive, which is connected to the I/O BOARD, which is driven by the MOCON, which is driven by the processor. The moral here is doing replace the spindle drives if the belt is broken. Find the problem first; don't just replace the easiest part to get to.Don tinker with the machineThere are hundreds of parameters, wires, switches, etc., that you can change in this machine. Don't start randomly changing parts and parameters. Remember, there is a good chance that if you change something, you will incorrectly install it or break something else in the process6. Consider for a moment changing the processor's board. First, you have to download all parameters, remove a dozen connectors, replace the board, reconnect and reload, and if you make one mistake or bend one tiny pin itWON'T WORK. You always need to consider the risk of accidentally damaging the machine anytime you work on it. It is cheap insurance to double-check a suspect part before physically changing it. The less work you do on the machine the better.译文一数控机床虽然各种数控机床的功能和应用各不相同，但它们有着共同的优点。
机械类数控外文翻译外文文献英文文献数控
机械类数控外文翻译外文文献英文文献数控IntroductionIn recent years, with the rapid development of science and technology, the traditional manufacturing industry has been facing tremendous challenges. In this context, computerized numerical control (CNC) technology has emerged as a revolutionary methodology that greatly improves the efficiency and accuracy of manufacturing processes. Specifically, CNC technology is a type of automated control system that uses a set of computer instructions to direct the movement and operation of machinery in the manufacturing process. In this regard, this paper will provide a comprehensive overview of CNC technology, including its history, applications, advantages, and challenges.History of CNC TechnologyCNC technology has a history that can be traced back to the 1940s. At that time, the aviation industry in the United States was seeking a way to improve the efficiency and accuracy of manufacturing. Therefore, the US Air Force and the Massachusetts Institute of Technology (MIT) cooperated to develop a system that automatically controlled the movement ofaircraft components during the manufacturing process. This system was called the numerical control (NC) system.In the mid-1950s, John Parsons, a researcher at the Massachusetts Institute of Technology, invented the first NC machine tool. The machine used punched tape to control the movement of the cutting tool. During the 1960s, digital computer technology became more advanced, which paved the way for the development of CNC machines. By 1970, CNC machines had become a mature and widely used technology in the manufacturing industry.Applications of CNC TechnologyCNC technology has a wide range of applications in the manufacturing industry. For example, CNC machines can be used to produce a variety of products, including automobile parts, aircraft components, medical equipment, and consumer goods. CNC technology is also used in many other industries, such as woodworking, metalworking, plastics, and textiles.CNC technology has revolutionized the manufacturing industry by improving the quality, precision, and consistency of products. In addition, CNC machines can work faster and often require less manual labor than traditional manufacturing methods. CNC technology also allows manufacturers to produce complex shapes and designs that would be difficult or impossible to produce using traditional manufacturing methods.Advantages of CNC TechnologyThere are several advantages of using CNC technology in manufacturing. First, CNC machines can produce parts with very high precision and accuracy, which is crucial in industries such as aerospace and medical equipment manufacturing. CNC machines can also work 24/7, which means that manufacturers can produce parts at any time of day or night without having to worry about workers becoming tired.Second, CNC machines are highly flexible and can be programmed to produce a wide range of products. This means that manufacturers can quickly switch between different products without having to buy new machines or invest in expensive retooling. This flexibility also allows manufacturers to respond quickly to changes in market demand.Third, CNC machines can greatly reduce the amount of waste generated during the manufacturing process. This is because CNC machines can accurately measure and cut materials, minimizing the amount of scrap that is created. In addition, CNC machines can be programmed to optimize the use of materials, further reducing waste.Challenges of CNC TechnologyDespite its many advantages, CNC technology also presents several challenges. First, CNC machines can be expensive to purchase and maintain, which can be a barrier for smallmanufacturers. In addition, CNC machines require skilled operators who can program and operate the machines. This means that manufacturers must invest in training their workers, which can also be costly.Second, CNC machines can sometimes be less efficient than traditional manufacturing methods for small production runs. This is because CNC machines require a certain amount of time to set up and program, which can be inefficient for small production runs. In addition, CNC machines require a certain amount of precision, which means that they may not be suitable for certain types of products, such as handmade crafts.Finally, CNC machines also present some ethical challenges. For example, some argue that CNC machines could lead to job loss in the manufacturing industry, as the machines can perform tasks that were previously done by workers. In addition, CNC machines could lead to a reduction in the quality of products, as manufacturers may be more focused on speed and efficiency rather than quality.ConclusionCNC technology has revolutionized the manufacturing industry by improving the quality, precision, and consistency of products. CNC machines are highly flexible and can be programmed to produce a wide range of products. In addition, CNC machines can greatly reduce the amount of waste generated during the manufacturing process. However, CNC technology alsopresents several challenges, including high cost, the need for skilled operators, efficiency issues for small production runs, and ethical concerns. Overall, CNC technology is a powerful tool for manufacturers, but it is important for manufacturers to carefully consider the costs and benefits of using this technology.。
机械类数控车床外文翻译外文文献英文文献车床.doc
LathesLathes are machine tools designed primarily to do turning, facing and boring, Very little turning is done on other types of machine tools, and none can do it with equal facility. Because lathes also can do drilling and reaming, their versatility permits several operations to be done with a single setup of the work piece. Consequently, more lathes of various types are used in manufacturing than any other machine tool.The essential components of a lathe are the bed, headstock assembly, tailstock assembly, and the leads crew and feed rod.The bed is the backbone of a lathe. It usually is made of well normalized or aged gray or nodular cast iron and provides s heavy, rigid frame on which all the other basic components are mounted. Two sets of parallel, longitudinal ways, inner and outer, are contained on the bed, usually on the upper side. Some makers use an inverted V-shape for all four ways, whereas others utilize one inverted V and one flat way in one or both sets, They are precision-machined to assure accuracy of alignment. On most modern lathes the way are surface-hardened to resist wear and abrasion, but precaution should be taken in operating a lathe to assure that the ways are not damaged. Any inaccuracy in them usually means that the accuracy of the entire lathe is destroyed.The headstock is mounted in a foxed position on the inner ways, usually at the left end of the bed. It provides a powered means of rotating the word at various speeds . Essentially, it consists of a hollow spindle, mounted in accurate bearings, and a set of transmission gears-similar to a truck transmission—through which the spindle can be rotated at a number of speeds. Most lathes provide from 8 to 18 speeds, usually in a geometric ratio, and on modern lathes all the speeds can be obtained merely by moving from two to four levers. An increasing trend is to provide a continuously variable speed range through electrical or mechanical drives.Because the accuracy of a lathe is greatly dependent on the spindle, it is of heavy construction and mounted in heavy bearings, usually preloaded tapered roller or ball types. The spindle has a hole extending through its length, through which long bar stock can be fed. The size of maximum size of bar stock that can be machined when the material must be fed through spindle.The tailsticd assembly consists, essentially, of three parts. A lower casting fits on the inner ways of the bed and can slide longitudinally thereon, with a means for clamping the entire assembly in any desired location, An upper casting fits on the lower one and can be moved transversely upon it, on some type of keyed ways, to permit aligning the assembly is the tailstock quill. This is a hollow steel cylinder, usually about 51 to 76mm(2to 3 inches) in diameter, that can be moved several inches longitudinally in and out of the upper casting by means of a hand wheel and screw.The size of a lathe is designated by two dimensions. The first is known as the swing. This is the maximum diameter of work that can be rotated on a lathe. It is approximately twice the distance between the line connecting the lathe centers and the nearest point on the ways, The second size dimension is the maximum distance between centers. The swing thus indicates the maximum work piece diameter that can be turned in the lathe, while the distance between centers indicates the maximum length of work piece that can be mounted between centers.Engine lathes are the type most frequently used in manufacturing. They are heavy-duty machine tools with all the components described previously and have power drive for all tool movements except on the compound rest. They commonly range in size from 305 to 610 mm(12 to 24 inches)swing and from 610 to 1219 mm(24 to 48 inches) center distances, but swings up to 1270 mm(50 inches) and center distances upto 3658mm(12 feet) are not uncommon. Most have chip pans and a built-in coolant circulating system. Smaller engine lathes-with swings usually not over 330 mm (13 inches ) –also are available in bench type, designed for the bed to be mounted on a bench on a bench or cabinet.Although engine lathes are versatile and very useful, because of the time required for changing and setting tools and for making measurements on the work piece, thy are not suitable for quantity production. Often the actual chip-production tine is less than 30% of the total cycle time. In addition, a skilled machinist is required for all the operations, and such persons are costly and often in short supply. However, much of the operator’s time is consumed by simple, repetitious adjustments and in watching chips being made. Consequently, to reduce or eliminate the amount of skilled labor that is required, turret lathes, screw machines, and other types of semiautomatic and automatic lathes have been highly developed and are widely used in manufacturing.2 Numerical ControlOne of the most fundamental concepts in the area of advanced manufacturing technologies is numerical control (NC). Prior to the advent of NC, all machine tools ere manually operated and controlled. Among the many limitations associated with manual control machine tools, perhaps none is more prominent than the limitation of operator skills. With manual control, the quality of the product is directly related to and limited to the skills of the operator. Numerical control represents the first major step away from human control of machine tools.Numerical control means the control of machine tools and other manufacturing systems through the use of prerecorded, written symbolic instructions. Rather than operating a machine tool, an NC technician writes a program that issues operational instructions to the machine tool. For a machine tool to be numerically controlled, it must be interfaced with a device for accepting and decoding the programmed instructions, known as a reader.Numerical control was developed to overcome the limitation of human operators, and it has done so. Numerical control machines are more accurate than manually operated machines, they can produce parts more uniformly, they are faster, and the long-run tooling costs are lower. The development of NC led to the development of several other innovations in manufacturing technology:Electrical discharge machining,Laser cutting,Electron beam welding.Numerical control has also made machine tools more versatile than their manually operated predecessors. An NC machine tool can automatically produce a wide of parts, each involving an assortment of widely varied and complex machining processes. Numerical control has allowed manufacturers to undertake the production of products that would not have been feasible from an economic perspective using manually controlled machine tolls and processes.Like so many advanced technologies, NC was born in the laboratories of the Massachusetts Institute of Technology. The concept of NC was developed in the early 1950s with funding provided by the U.S. Air Force. In its earliest stages, NC machines were able to made straight cuts efficiently and effectively.However, curved paths were a problem because the machine tool had to be programmed to undertake a series of horizontal and vertical steps to produce a curve. The shorter the straight lines making up the steps, the smoother is the curve, Each line segment in the steps had to be calculated.This problem led to the development in 1959 of the Automatically Programmed Tools (APT) language. This is a special programming language for NC that uses statements similar to English language to define the part geometry, describe the cutting tool configuration, and specify the necessary motions. The development of the APT language was a major step forward in the fur ther development from those used today. The machines had hardwired logic circuits. The instructional programs were written on punchedpaper, which was later to be replaced by magnetic plastic tape. A tape reader was used to interpret the instructions written on the tape for the machine. Together, all of this represented a giant step forward in the control of machine tools. However, there were a number of problems with NC at this point in its development.A major problem was the fragility of the punched paper tape medium. It was common for the paper tape containing the programmed instructions to break or tear during a machining process. This problem was exacerbated by the fact that each successive time a part was produced on a machine tool, the paper tape carrying the programmed instructions had to be rerun through the reader. If it was necessary to produce 100 copies of a given part, it was also necessary to run the paper tape through the reader 100 separate tines. Fragile paper tapes simply could not withstand the rigors of a shop floor environment and this kind of repeated use.This led to the development of a special magnetic plastic tape. Whereas the paper carried the programmed instructions as a series of holes punched in the tape, the plastic tape carried the instructions as a series of magnetic dots. The plastic tape was much stronger than the paper tape, which solved the problem of frequent tearing and breakage. However, it still left two other problems.The most important of these was that it was difficult or impossible to change the instructions entered on the tape. To made even the most minor adjustments in a program of instructions, it was necessary to interrupt machining operations and make a new tape. It was also still necessary to run the tape through the reader as many times as there were parts to be produced. Fortunately, computer technology became a reality and soon solved the problems of NC associated with punched paper and plastic tape.The development of a concept known as direct numerical control (DNC) solved the paper and plastic tape problems associated with numerical control by simply eliminating tape as the medium for carrying the programmed instructions. In direct numerical control, machine tools are tied, via a data transmission link, to a host computer. Programs for operating the machine tools are stored in the host computer and fed to the machine tool an needed via the data transmission linkage. Direct numerical control represented a major step forward over punched tape and plastic tape. However, it is subject to the same limitations as all technologies that depend on a host computer. When the host computer goes down, the machine tools also experience downtime. This problem led to the development of computer numerical control.3 TurningThe engine lathe, one of the oldest metal removal machines, has a number of useful and highly desirable attributes. Today these lathes are used primarily in small shops where smaller quantities rather than large production runs are encountered.The engine lathe has been replaced in today’s production shops by a wide variety of automatic lathes such as automatic of single-point tooling for maximum metal removal, and the use of form tools for finish on a par with the fastest processing equipment on the scene today.Tolerances for the engine lathe depend primarily on the skill of the operator. The design engineer must be careful in using tolerances of an experimental part that has been produced on the engine lathe by a skilled operator. In redesigning an experimental part for production, economical tolerances should be used.Turret Lathes Production machining equipment must be evaluated now, more than ever before, this criterion for establishing the production qualification of a specific method, the turret lathe merits a high rating.In designing for low quantities such as 100 or 200 parts, it is most economical to use the turret lathe. In achieving the optimum tolerances possible on the turrets lathe, the designer should strive for a minimum of operations.Automatic Screw Machines Generally, automatic screw machines fall into several categories; single-spindle automatics, multiple-spindle automatics and automatic chucking machines. Originally designed for rapid, automatic production of screws and similar threaded parts, the automatic screw machine has long since exceeded the confines of this narrow field, and today plays a vital role in the mass production of a variety of precision parts. Quantities play an important part in the economy of the parts machined on the automatic screw machine. Quantities less than on the automatic screw machine. The cost of the parts machined can be reduced if the minimum economical lot size is calculated and the proper machine is selected for these quantities.Automatic Tracer Lathes Since surface roughness depends greatly on material turned, tooling , and feeds and speeds employed, minimum tolerances that can be held on automatic tracer lathes are not necessarily the most economical tolerances.In some cases, tolerances of 0.05mm are held in continuous production using but one cut . groove width can be held to 0.125mm on some parts. Bores and single-point finishes can be held to 0.0125mm. On high-production runs where maximum output is desirable, a minimum tolerance of 0.125mm is economical on both diameter and length of turn.车床车床主要是为了进行车外圆、车端面和镗孔等项工作而设计的机床。
数控车床主轴部件机械外文文献翻译、中英文翻译、外文翻译
数控车床主轴部件机械外文文献翻译、中英文翻译、外文翻译中国地质大学长城学院本科毕业设计外文资料翻译系别：工程技术系专业：机械设计制造及其自动化姓名：王泽民学号： 052116362015年4月30日外文原文翻译数控车床主轴部件车床是主要用于生成旋转表面和平整边缘的机床。
根据它们的使用目的、结构、能同时被安装刀具的数量和自动化的程度，车床—更确切地说是车床类的机床，可以被分成以下几类：(1)普通车床(2)万能车床(3)转塔车床(4)立式车床(5)自动车床(6)特殊车床虽然车床类的机床多种多样，但它们在结构和操作原理上具有共同特性。
这些特性可以通过普通车床这一最常用的代表性类型来最好地说明。
下面是关于图11.1所示普通车床的主要部分的描述。
车床床身：车床床身是包含了在两个垂直支柱上水平横梁的主骨架。
为减振它一般由灰铸铁或球墨铸铁铸造而成。
它上面有能让大拖板轻易纵向滑动的导轨。
车床床身的高度应适当以让技师容易而舒适地工作。
主轴箱：主轴箱固定在车床床身的左侧，它包括轴线平行于导轨的主轴。
主轴通过装在主轴箱内的齿轮箱驱动。
齿轮箱的功能是给主轴提供若干不同的速度(通常是6到18速)。
有些现代车床具有采用摩擦、电力或液压驱动的无级调速主轴箱。
主轴往往是中空的，即纵向有一通孔。
如果采取连续生产，棒料能通过此孔进给。
同时，此孔为锥形表面可以安装普通车床顶尖。
主轴外表面是螺纹可以安装卡盘、花盘或类似的装置。
尾架：尾架总成基本包括三部分，底座、尾架体和套筒轴。
底座是能在车床床身上沿导轨滑动的铸件，它有一定位装置能让整个尾架根据工件长度锁定在任何需要位置。
这通过使用手轮和螺杆来达到，与螺杆啮合的是一固接在套筒轴上的螺母。
套筒轴开口端的孔是锥形的，能安装车床顶尖或诸如麻花钻和镗杆之类的工具。
套筒轴通过定位装置能沿着它的移动路径被锁定在任何点。
大拖板：大拖板的主要功能是安装刀具和产生纵向和/或横向进给。
它实际上是一由车床床身V形导轨引导的、能在车床床身主轴箱和尾架之间滑动的H形滑块。
数控车床主轴部件机械外文文献翻译、中英文翻译、外文翻译
中国地质大学长城学院本科毕业设计外文资料翻译系别：工程技术系专业：机械设计制造及其自动化姓名：王泽民学号： 052116362015年4月30日外文原文翻译数控车床主轴部件车床是主要用于生成旋转表面和平整边缘的机床。
根据它们的使用目的、结构、能同时被安装刀具的数量和自动化的程度，车床—更确切地说是车床类的机床，可以被分成以下几类：(1)普通车床(2)万能车床(3)转塔车床(4)立式车床(5)自动车床(6)特殊车床虽然车床类的机床多种多样，但它们在结构和操作原理上具有共同特性。
这些特性可以通过普通车床这一最常用的代表性类型来最好地说明。
下面是关于图11.1所示普通车床的主要部分的描述。
车床床身：车床床身是包含了在两个垂直支柱上水平横梁的主骨架。
为减振它一般由灰铸铁或球墨铸铁铸造而成。
它上面有能让大拖板轻易纵向滑动的导轨。
车床床身的高度应适当以让技师容易而舒适地工作。
主轴箱：主轴箱固定在车床床身的左侧，它包括轴线平行于导轨的主轴。
主轴通过装在主轴箱内的齿轮箱驱动。
齿轮箱的功能是给主轴提供若干不同的速度(通常是6到18速)。
有些现代车床具有采用摩擦、电力或液压驱动的无级调速主轴箱。
主轴往往是中空的，即纵向有一通孔。
如果采取连续生产，棒料能通过此孔进给。
同时，此孔为锥形表面可以安装普通车床顶尖。
主轴外表面是螺纹可以安装卡盘、花盘或类似的装置。
尾架：尾架总成基本包括三部分，底座、尾架体和套筒轴。
底座是能在车床床身上沿导轨滑动的铸件，它有一定位装置能让整个尾架根据工件长度锁定在任何需要位置。
这通过使用手轮和螺杆来达到，与螺杆啮合的是一固接在套筒轴上的螺母。
套筒轴开口端的孔是锥形的，能安装车床顶尖或诸如麻花钻和镗杆之类的工具。
套筒轴通过定位装置能沿着它的移动路径被锁定在任何点。
大拖板：大拖板的主要功能是安装刀具和产生纵向和/或横向进给。
它实际上是一由车床床身V形导轨引导的、能在车床床身主轴箱和尾架之间滑动的H形滑块。
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Boolean operations for 3D simulation of CNC machiningof drilling toolsDani Tost*, Anna Puig, Lluı´s Pe´rez-VidalSoftware Department, Polytechnical University of Catalonia, Spain Accepted 25 April 2003AbstractThis paper addresses the simulation of drilling tools CNC machining. It describes a novel approach for the computation of the boundary representation of the machined tools. Machining consists of a sequence of Boolean operations of difference between the tool and the grinding wheels through time. The proposed method performs the dynamic Boolean operations on cross sections of the tool and it reconstructs the 3Dmodel by tiling between the cross sections. The method is based on classical computational geometry algorithms such as intersection tests,hull computations, 2D Boolean operations and surface tiling. This approach is efficient and it provides user control on the resolution of the operations.Abstract This paper addresses the simulation of drilling tools CNC machining. It describes a novel approach for the computation of the boundary representation of the machined tools. Machining consists of a sequence of Boolean operations of difference between the tool and the grinding wheels through time. The proposed method performs the dynamic Boolean operations on cross sections of the tool and it reconstructs the 3Dmodel by tiling between the cross sections. The method is based on classical computational geometry algorithms such as intersection tests,hull computations, 2D Boolean operations and surface tiling. This approach is efficient and it provides user control on the resolution of the operations.q 2003 Elsevier Ltd. All rights reserved.Keywords: CNC simulations; Bores machining; Computationalgeometry; Boolean operations; Surface tiling1. IntroductionMost of the research on CNC in CAD is centered on theautomatic computation of tool paths [5,13]. Given a final tool design, the optimal trajectories of the tool and the grinding wheels must be computed yielding as final result the CNC code. Machining simulation and verification hasexactly the opposite goal: to calculate the tool starting from the CNC code and from a geometrical model of the machine, the wheels and the tool before machining. This simulation has three main applications [6]. First, it detects eventual collisions between the tool or any of the grinding wheels and the rest of the machine. It is important to avoid collisions because serious damages to the machines can follow. Next, simulation provides a means of visually verifying the efficiency of the trajectories, which may result in faster and cheaper processes. Finally, the simulation allows users to check if the surface of the resulting tool is effectively the desired one. In the routine practice of machining, experienced operators have enough skills to imagine the tool final shape by only reading the CNC code.However, they are generally not able to do so with new or non-standard designs. Therefore, the use of a simulation system decreases considerably the tool production cost because it avoids the trial and error process on the real machine with costly materials that is otherwise necessary.This paper addresses a particular type of CNC machining simulation: the grinding of bores and cutters. Conventional CAD systems do not provide a means of realizing this type of simulations and specific applications are needed. Until recently, most of thesimulation applications dealt only with the machining of 2D cross-sections of the tools and they were restricted to the main fluting operation [3]. Three dimensional applications are rather recent [4,23]. They provide a machining simulation for specific 5-axes machines and they are not applicable to general movements. This paper presents a novel approach for the computation of the external shape of the tools through a sequence of coordinated movements of the tool and the wheels on machines of up to 6-axes. The proposed method reduces the 3D problem to 2D dynamic Boolean operations followed by a surface tiling. The 2D solution involves different techniques of planar computational geometry: from intersections to hull computations.The paper is structured as follows. In Section 2 we review previous approaches on machining simulations.Section 3 describes briefly the contour conditions of the simulation. Finally, Section 4 describes the computation of Boolean operations and the results of the implementation are shown in Section 5.2. Previous workMachining can be considered a dynamic Boolean operation of difference between the grinding wheel and the tool. It is dynamic, because both the tool and the wheels move along time through rotations and translations.The Vector Cut [8,10], is probably the most referenced numerical control simulation method. It is an approximate solution that represents the frontier as a set of points and normal vectors that will be cut along the path of the grinding wheel. This method is effective for the simulation of sculptured surface polishing, but it is not extensible to complex motions of the tool and/or the grinding wheels. It is mainly useful to detect mistakes in the path suggestedby the presence of abnormally high or small cut vectors. Besides, except for the extension of Ref. [16], it does not yield directly a model of the bit to be machined.An alternative strategy for machining simulation consists of realizing a sequence of 3D static Boolean operations through time. The main drawback of this strategy is its high computational cost. According to Ref. [11], this is proportional to the number of discrete positions to the fourth. This puts it out of question, in practical terms.Another problem it shows is the granularity of the temporal discretization : it must be very fine if precision in the final tool is required. This means that very little material is cut off in each Boolean operation, and that may entail robustness problems in the computations. A possible method to avoid both problems is to discretize the initial tool model into a voxel or an octree model, [20], to perform all the sequence of Boolean operations on the discrete model and then reconstruct the machined surface, at the end. This approach benefits from the fact that the cost of discrete Boolean operations is much lower and the reconstruction phase at the end of the process is done as late as possible. This option requires the sequence of movements to be specified in terms of relative motion of the grinding wheel, while the tool and its discretization remain fixed. This prerequisite is not always valid and, in particular, it does not hold for the general case of 6-axes machines.Finally, another option taken into account is that of the computation of the volume swept by the tool and the grinding wheel in their motions. A geometric representation of this volume would allow performing only one Boolean difference operation between the two volumes. The main difficulty of this option is the computation of sweptvolumes. There are several references [1,2,21] on this subject, that contain methods generally applied in CAD for extrusions, collisiondetection, and other problems but none of them can be applied to the non-trivial case of simultaneous motion of the two solids in play.The strategy proposed herein overcomes the disadvantages of these methods. It consists of a double discretization of four dimensional space (3D þ time) that reduces the general problem to a sequence of 2D Boolean operations and 3D geometric reconstructions. This algorithm is fast and it provides user-control on simulation accuracy.3. Scene modelThere are different types of machine tools for the fabrication of bores and cutters. They share the same general structure but they differ in the number of degrees of freedom. The method proposed herein deals with machines up to six degrees of freedom. These machines have a static vertical axis (Z in Fig. 1 on which the grinding wheel set can move up and down. One tool is placed on a spindle (the toolholder), that may translate on three axes (X; Y and U) and rotate on two axes (W in relation to the wheel axis and A relative to its own axis). At the beginning of the process, a tool has a piecewise cylindrical or conical shape. Its final shape is the result of a sequence of machining operations consisting of simultaneous movements of the tool and the wheels. The wheel shape is also piecewise cylindrical or conical. It remains unchanged during the process.The machining process is divided into a set of operations, each one with a specific name in CNC jargon. Each operation is performed using a specific wheel. This information is written in the CNC file.Specifically, the main operations are (in their usual order):Fig. 1. 6-Axes machine tool.Fig. 2. Machining operations on a tool.* Fluting: performing the lateral helicoidal of straight grooves* Gashing: cuts in the tool head* Outer diameter sharpening: edge sharpening of the lateral grooves* End face sharpening: edge sharpening of the tool head cuts* Notching: direct cut in the tool head.Fig. 2 shows a real bore and it indicates the operations that have given its shape.Each operation performs several symmetrical cuts in the tool shape. The tool shown in Fig. 2, for instance, has three lateral grooves realized during the ‘Fluting’ operation. Each cut is performed through a sequence of movements. In the CNC code, each movement corresponds to a line instruction specifying the motion axes (X; Y;U; A; or W for the tool and Z for the wheel) along with the amount of rotation or translation to be performed for each edge.4. Machining simulation4.1. OverviewOur approach uses the fact that the tools have a tubular shape. It consists of discretizing the tool in axial sections, performing the machining operations on these crosssections and finally, reconstructing the surface of the tool by tiling between cross-sections. Before machining, the cross-sections are circles. Afterwards, they have a complex shape that may even have been split into separate connected shells at the tool end.The movements are divided into blocks, each one corresponding to an CNC operation or even to one cut within an operation. The machining process is performed sequentially for each block. Therefore, as many intermediate models are created as instruction blocks exist. The initial tool is taken as input of the first machining process. Theresulting tool is used in the second block processing and so on. The surface reconstruction step can be performed on any of these intermediate models or, alternatively only on the last one.Therefore, the simulation process of each instructions block is composed of two steps:* A 2D Boolean operation process, that receives as input: (i) the tool representation, (ii) the machining wheel representation, (iii) a list of movements and that gives as output a new representation of the tool cross-sections.* A tiling process that completes the tool representation with the triangulation between contours.The second step, surface tiling, is a classical subject in computer graphics [14]. It consists of two related problems: (i) establishing correspondences between contours (branching problem) and (ii) searching correspondent vertices to form tiles (correspondence problem). Several solutions have been published to solve both problems based on minimizing the distance between successive contours [7,17] and interpolating in between contours [12]. The method used herein is an extension of these algorithms that adds to these criteria the constraint of tiling between segments of the contour corresponding to the same machining operation. This extension is described in depth in Ref. [22].4.2. Machining of the tool cross-sectionsThe computation of the new shape of tool cross section consists of three steps:* Computation through time of the intersections of the wheel cross sections and the external contour of the tool section. Bothsections are circular and, due to their relative orientation, their intersection is a segment. Therefore, the result of this step is a set of segments.* Calculation of the hulls of the segments set. These hulls are polygonal approximations of wheel cuts on the tool section.* Reconstruction of the tool cross section contour given its original shape and the hull curves.The pseudo-code algorithm below illustrates this process. Let st be the tool cross section at the beginning of the process, where the wheel and ml the movements list. The wheel is discretized into a set of circular cross-sections switch (procedures FirtSectWheel and NextSectWheel). The movement of switch and st is decomposed into a a set of successive positions (inner loop). For each position, the intersection between sw and st is computed in the procedure InterSect. If there is intersection, then the corresponding segment segm is stored in the segments list seglist. Then, the geometry of st, sw and seglist is updated to next positions in the procedure UpdateGeom. The position of st is reset at its initial location for each new wheel section. After all the wheel sections have been processed, the hulls of the segment list are computed in CompHulls and then clipped against the initial contour of st with the procedure Reconstruct.procedure CrossSection Machining(st: tSection,wh: tWheel, ml: tMovList)varsw: tSectionsegm: tSegmentseglist: tSegmentListhulls: tHullListfvarInitSegList(seglist)sw U FirstSectWheel (wh)while ValidSection(sw) doendo f mov U FALSEwhile : endo f mov doInterSect(st,sw, &segm, &status)if status ! InsertSegment(segm, seglist) endifUpdateGeom(ml, &st, &sw, &seglist, &endo fmov)endwhilesw U NextSectWheel(wh,sw)ResetToolPosition(&st)endwhileCompHulls(slist, &hulls)Reconstruct(hulls, &st)fprocedure4.2.1. Updating geometryEach movement instruction is realized at constant speed. Therefore, a movement can be decomposed into n constant intervals of translation in X; Y; Z and U along with rotation in W and A : δA=ΔA/n,δW=ΔW/n,δX=ΔX/n,δY=ΔY/n,δU=ΔU/n andδZ=ΔZ/n.As mentioned in Section 3, a line movement can be composed of several simultaneous instructions. Most of the tool movements are composed of translations and axial rotations, which are independent. Therefore, the order in which the update of each movement is done is irrelevant. However for conical tools with a round end called ‘ball nose’, simultaneous axial translations and colum n angle rotations are necessary. These two movements are obviously not independent. Thiscan be a source of error (Fig. 3) because the real machine rotates the tool column angle at the same time as it translates it along its axis, while in the simulation, for each time interval, the tool is first rotated and next translated along its axis. However, in these cases the original CNC is already decomposed as a set of very small movements with a resolution very similar to the one needed in the machining. Therefore, these movements are not further decomposed in the machining.The global coordinate system in which the geometry is expressed along time is sketched in Fig. 4. The axis coincide with the machine axis X; Y and Z at the tool home position at the beginning of machining. Let ct(xtk, ytk;,0.0)be the coordinates of the tool section center at instant k: The components of the normal vector of the section are ntk(nxtk, nytk,0.0). It should be noted that nxtk =cos(ωk) and nytk= sin(ωk); being vk the column angle of the tool at instant k: The updated values of these coordinates at k +1.Fig. 3. Non equivalent transformations.Fig. 4. Coordinate system, axes and motion.5. Conclusions and future workThis paper describes a novel method for the simulation of drilling tools CNC machining. Our approach simplifies the 4D (space t time) Boolean operations between the tool and the wheels by reducing them to a sequence of intersections between 2D perpendicular cross-sections along time. Specifically, the method discretizes the toolinto cross-sections and simulates machining on the cross sections. Next, the shape of the tool is recomputed by tiling between contours.The primary advantage of this approach is its simplicity. It addition, it provides user-control on the resolution of the simulation: spacing between crosssections as well as time interval between consecutive intersections.Starting from this work, new research and development lines are opened. Specifically, we are working on global pipelines that would put into the same process automatic CNC computation and tool verification. With such pipelines, given a final tool description, theCNC code to create it would be automatically computed, next using the CNC code as input, tool machining would be simulated. Finally, differences between the input and the output model could be computed and shown.钻探工具数控加工三维仿真的布尔运算摘要本文旨在对钻探工具数控加工的仿真研究。