章跃机械制造工程专业英语---Lesson 1 Mechanical Properties of Metals
机械工程专业英语(1)
二. 句子结构特点
1. 句子长 2. 被动语态多 e.g: The rate at which work is done is called power. 3. 后置定语多 4. 名词化结构多 e.g: to control the machine ---- the control of the machine
学习方法与教学方法 工具书的介绍
1. 收词不足,收词量有限 2. 收词面广 3. 例证丰富 4. 释义地道, 全面 5. 词的用法说明较详细
Lesson 1 Introduction for Materials
Designers and engineers are usually more interested in the behavior of materials under load or when in a magnetic field than in why they behave as they do.
In this case structure-insensitive properties include the traditional physical properties: electrical and thermal conductivity, specific heat, density, and magnetic and optical properties.
1. the measured magnitude: 测定的大小 2. response to: 对…..的反应
In engineering materials the properties are recorded in handbooks or, for new materials, are made available by the supplier.
(完整版)1机械工程专业英语第一课-1
机械工程专业英语第一课机械工程专业英语概述English in Mechanical Engineering一、专业英语概述1. 什么是翻译：翻译就是将一种语言文字的意义用另一种语言文字表达出来。
机械工程英语翻译就是将机械工程学科的英语原著由原作语言(source language)用译文语言(target language)忠实、准确、严谨、通顺、完整地再现出来，使人们能够借助汉语译文准确无误地了解英语机械工程著作所阐述的工程技术内容和科学理论。
机械工程专业英语概述English in Mechanical Engineering2. 翻译例句例1. Control Center, Smoking Free.例2. The tolerance should not be so big.例3. A dog driver stop the rotation of the wheel. 例4. Connect the black pigtail with thedog-house.例5. The importance of computer in the use of manufacturing can not be overestimated. 机械工程专业英语概述English in Mechanical Engineering例1. Control Center, Smoking Free.错误译法：控制中心，吸烟自由。
正确译法：控制中心，严禁吸烟。
例2. The tolerance should not be so big.a. 此公差不应给这么大。
（机械学）b. 忍耐力不会有这么大。
(关于人体的耐受性)c. 抗毒性不会有这么强。
（医学）例3. A dog driver stop the rotation of the wheel. 错误译法：狗驾驶员使轮子停转。
专业译法：止动器使轮子停止旋转。
机械设计制造及其自动化专业英语UnitMechanicalPropertiesofMaterialsPPT课件
精品课件 10
Mechanical properties
• This is depicted [diˈpekt] by the straight line relationship and a small deviation [ˌdiviˈeʃən] thereafter, in the stress-strain curve (Fig. 3. 1).
• 而在这其中最重要的是腐蚀性，通俗的解释 是材料在特定大气中长期使用时，抵抗腐(败) 蚀的能力。
精品课件 5
Mechanical properties
• Mechanical properties include the strength properties like tensile, compression, shear, torsion, impact, fatigue and creep .
word
• cross-section 横截面 • ordinate n. 纵坐标 [ˈɔ:rdineit] • abscissa n. 横坐标 [əbˈsisə] • deviation n. 偏离；偏移 [ˌdi:viˈeiʃən] • time-lag 延时；落后；时滞 • yield n. ； v. 屈服 [ji:ld] • elongation n. 延伸率；伸长 [ˌi:lɔŋ'ɡeiʃən] • diminish n. 减小；缩小 [diˈminiʃ] • necking n. 颈缩；形成细颈现象 ['nekiŋ]
• 材料在加载时，随着载荷大小的变化，尺寸 会发生改变。
精品课件 9
Mechanical properties
机械专业英语(章跃版)课后英汉翻译讲解
第一章：应力与应变1.That branch of scientific analysis which motions, times and forces is called mechanics and is made up of two parts, statics and dynamics.研究位移、时间和力运动乘力是科学分析法的一个分歧，被称作力学，力学由两大部分组成，静力学和动力学。
2.For example, if the force operating on a sleeve bearing becomes too high, it will squeeze out the oil film and cause metal-to-metal contact, overheating and rapid failure of the bearing.例如：如果止推轴承上的作用力过大的话，会挤出油膜，引起金属和金属之间的相互接触，轴承将过热而迅速失效。
3.Our intuitive concept of force includes such ideas as place of application, direction, and magnitude, and these are called the characteristics of a force.力的直观概念包括力的作用点、大小、方向，这些被称为力的三要素。
4.All bodies are either elastic or plastic and will be deformed if acted upon by forces. When the deformation of such bodies is small, they are frequently assumed to be rigid, i.e., incapable of deformation, in order to simplify the analysis.所有的物体既可以是弹性的也可以是塑性的，如果受到力的作用就产生变形。
机械工程专业英语 第一课文及阅读材料
Lesson1 the mechanical design process 1, the mechanical design processThe ultimate objective of mechanical design is to produce a useful product that satisfies the needs of a customer and that is safe ,efficient, reliable, economical, and practical to manufacture .think broadly when answering the question ,”who is the customer for the product or system I am about to design?”it is essential that you know the desires and expectations of all customers before product design. marketing professionals are often employed to manage the definition of customer expectations , but designers will likely work with them as a part of a product development team .many methods are used to determine what the customer wants. One popular method , called quality function deployment or QFD , seeks(1) to identify all of the features and performance factors that customers desire and (2) to assess the relative importance of these factors. the result of the QFD process is a detailed set of functions and design requirements for the product.It is also important to consider how the design process fits with all functions that must happen to deliver a satisfactory product to the customer and to service the product throughout its lift cycle. in fact, it is important to consider how the product will be disposed of after it hasserved its useful life . the total of all such function that affect the product is sometimes called the product realization process or PRP . some of the factors included in PRP are as follows:1 marketing functions to assess customer requirements2 research to determine the available technology that can reasonably be used in the product3 availability of materials and components that can be incorporated into the product4 product design and development5 performance testing6 documentation of the design7 vendor relationships and purchasing functions8 work-force skills9 physical plant and facilities available10 capability of manufacturing systems11production planning and control of production systems12production support systems and personnel13 quality systems requirements14 sales operations and time schedules15 cost targets and other competitive issues16 customer service requirements17 environmental concerns during manufacture , operation anddisposal of the product18 legal requirements19 availability of financial capitalCan you add to this list? You should be able to see that the design of a product is but one part of a comprehensive process. in this text, we will focus more carefully on the design process itself , but the producibility of designs must always be considered . this simultaneous consideration of product design and manufacturing process design is often called concurrent engineering.2 skills needed in mechanical designProduct engineers and mechanical designers use a wide range of skills and knowledge in their daily work . these skills and knowledge are included in the following :1sketching, technical drawing , and computer-aided design2 properties of materials, materials processing, and manufacturing processes3 applications of chemistry, such as corrosion protection, plating , and painting4 statics, dynamics, strength of materials , kinematics, and mechanisms5 fluid mechanics, thermodynamics, and heat transfer6 fluid power, the fundamentals of electrical phenomena, andindustrial controls7 experimental design and performance testing of materials and mechanical systems8 stress analysis9 specialized knowledge of the behavior of machine elements, such as gears, belt drives, chain drives, shafts, bearings, keys, splines, couplings, seals, spring, connections(bolted, riveted, welded, adhesive), electric motors, linear motion devices, clutches, and brakes10 creativity , problem solving ,and project management11 oral communication, listening, technical writing, and teamwork skills3 functions , design requirements and evaluation criteriaSection 1 emphasized the importance of carefully identifying the needs and expectations of the customer prior to beginning the design of a mechanical device. you can formulate these by producing clear , complete statements of functions, design requirements , and evaluation criteria:1 Functions tell us what the device must do , using general , nonquantitative statements that employ action phrases such as “to support a load”, “to lift a crate ”, “to transmit power”, or “to hold two structural members together”, etc2 Design requirements are detailed, usually quantitativestatements of expected performance levels, environmental conditions in which the device must operate, limitations on space or weight , or available materials and components that may be used3 Evaluation criteria are statements of desirable qualitative characteristics of a design that assist the designer in deciding which alternative design is optimum-that is , the design that maximizes benefits while minimizing disadvantagesTogether these elements can be called the specifications for the designMost designs progress through a cycle of activities are outlined in figure1.1. you should typically propose more than one possible alternative design concept. This is where creativity is exercised to produce truly novel designs .Each design concept must satisfy the functions and design requirements . a critical evaluation of the desirable features, advantages, and disadvantages of each design concept should be completed . then a rational decision analysis technique should use the evaluation criteria to decide which design concept is the optimum and , therefore , should be produced.Reading materialMechanical design is the process of designing and/or selecting mechanical components and putting them together to accomplish a desired function. Of course machine elements must be compatible ,must fit well together , and must perform safely and efficiently. The designer must consider not only the performance of the element being designed at a given time , but also the elements with which it must interface.To illustrate how the design of machine elements must be integrated with a larger mechanical design , let us consider the design of a speed reducer for the small tractor . suppose that,to accomplish the speed reduction ,you decide to design a double-reduction, spur gear speed reducer. You specify four gears , three shafts , six bearings, and a housing to hold the individual elements in proper relation to each other. The primary elements of the speed reducer are :1 the input shaft is to be connected to the power source, a gasoline engine whose output shaft rotates at 2000 rpm . a flexible coupling is to be employed to minimize difficulties with alignment .2 the first pair of gears, a and b ,causes a reduction in the speed of the intermediate shaft proportional to the ratio of the numbers of teeth in the gears. Gear b and c are both mounted to intermediate shaft and rotate at the same speed .3 a key is used at the interface between the hub of each gear and the shaft on which it is mounted to transmit torque between the gear and the shaft .4 the second pair of gears , c and d ,further reduces the speed of gear d and the output shaft to the range of 290 rpm to 295 rpm .5 the output shaft is to carry a chain sprocket.the chain drive ultimately is to be connected to the drive wheel of the tractor.6 each of the three shafts is supported by two ball bearings .making them statically determinate and allowing the analysis of forces and stresses using standard principles of mechanics.7 the bearings are held in a housing that is to be attached to the frame of the tractor . note the manner of holding each bearing so that the inner race rotates with the shaft while the outer race is held stationary.8 seals are on the input and output shafts to prohibit contaminants from entering the housing .9 details of how the active elements are to be installed , lubricated, and aligned are only suggested at this stage of the design process to demonstrate feasibility .one possible assembly process could be as follows.Start by placing the gearing the gears, keys, spacers, and bearings on their respective shaftsThen insert input shaft into its bearing seat on the left side of the housing.Insert the left end of intermediate shaft into its bearing seat whileengaging the teeth of gears a and b.Install the center bearing support to provide support for the bearing at the right side of input shaft.Install output shaft by placing its left bearing into the seat on the center bearing support while engaging gears c and d.Install the right side cover for the housing while placing the final two bearings in their seats.Ensure careful alignment of the shafts.Place gear lubricant in the lower part of housing .The arrangement of the gears, the placement of the bearings so that they straddle the gears , and the general configuration of the housing are also design decisions . the design process cannot rationally proceed until these kinds of decisions are made . when the overall design is conceptualized, the design of the individual machine elements in the speed reducer can proceed . you should recognize that you have already made many design decisions by rendering such a sketch . first, you choose spur gears rather than helical gears , a worm and worm gear , or bevel gears. in fact , other types of speed reduction devices –belt drives , chain drives, or many others—could be appreciate.1gearsfor the gear pairs ,you must specify the number of teeth in each gear ,the pitch (size) of the teeth , the pitch diameters, the face width ,and the material and its heat treatment . these specifications depend on considerations of strength and wear of the gear teeth and the motion requirements(kinematics ). You must also recognize that the gears must be mounted on shafts in a manner that ensures proper location of the gears, adequate torque transmitting capability from the gears to the shafts (as through keys ) and safe shaft design.2shaftshaving designed the gear pairs, next you will consider the shaft design . the shaft is loaded in bending and torsion because of the forces acting at the gear teeth . thus, its design must consider strength and rigidity , and it must permit the mounting of the gears and bearings . shafts of varying diameters may be used to provide shoulders against which to seat the gears and bearings. There may be keyseats cut into the shaft, the input and output shafts will extend beyond the housing to permit coupling with the engine and the drive axle . the type of coupling must be considered, as it can have a dramatic effect on the shaft stress analysis. Seals on the input and output shafts protect internal components.3bearingsdesign of the bearings is next. If rolling contact bearings are to be used , you will probably select commercially available bearings from a manufacturer’s catalog , rather than design a unique one . you mustfirst determine the magnitude of the loads on each bearing from the shaft analysis and the gear designs. The rotational speed and reasonable design life of the bearings and their compatibility with the shaft on which they are to be mounted must also be considered. For example , on the basis of the shaft analysis, you could specify the minimum allowable diameter at each bearing seat location to ensure safe stress levels . the bearing selected to support a particular part of the shaft ,then , must have a bore( inside diameter) no smaller than necessary. When a specific bearing is selected , the shaft at the bearing seat location and allowable tolerances must be specified ,according to the bearing manufacturer’s recommendations , to achieve proper operation and life expectancy of the bearing.。
机械制造专业英语4B原文及翻译(章跃主编)
CHAIN DRIVESChain drives occupy a unique position in the mechanical field.In a sense,they are similar to belt drives;a chain connects sprockets on the driving and driven shafts.The velocity ratio transmitted from one shaft to the other depends on the size of the two sprockets(at the pitch line);unlike that found with belts,the ratio is positive.In belt drive ,creep and slip play important roles and must be considered;in a chain drive,which is made up of numerous links,there is a small amount of play in the total length of the chain.This may be desirable in case of small overloads.A chain drive is similar to the open-belt type of dirve in that the driving and driven shafts rotate in the same direction.There are also similarities between chain drives and gear drives.Both types transmit a positive velocity ratio.In a regular spur-gear drive,the driving and driven shafts turn in opposite directions unless an idler is employed.In gear drives employing an annular or ring gear,however,the input and output shafts rotate in the same direction.In a spur-gear drive there is very little contact between meshing gears;therefore,tooth loads are excessive.Since the connection between a chain and its sprocket extends over several teeth,no one tooth is subjected to heavy loads.Chain drives are often noisy.The silent chain type of drive was developed to counteract this undesirable characteristic.Belt,chain,and gear drives are all dangerous.Belt and chain speeds are high,as is the pitch-line velocity of most gear drives.All should be adequately covered by suitable guards(or completely enclosed) so that no boby or clothing parts can possibly be caught in the moving components.Other comparisons can be made among chain,belt,and gear drives.Gear drives can operate at higher speeds than the others,and are usually more compact.However,chain drives do not require the mounting precision that is so essential for gearing.An advantage of chain drives in comparison to belt drives is that the former do not require tension on the slack side;this leads to better bearing life.In general,chain drives are more compact than the belt type;for a given ratio,the sprockets can be smaller than belt pulleys.For a given load,chain widths are narrower than comparable flat belts.The connecting link on chain drives makes them easy to install—the chain is merely placed over the sprockets and the proper pins are placed in position.In most belt installations,force is needed to place the belt in the proper position;such action is detrimental to mounting bearings.The angle of contact for the driving sprocket can be smaller than the driving pulley for a belt drive.For a chain drive,this angle can be as small as 120 degrees.The center distance can also be small;if a 120-degree angle of contact is provided,the center distance need be no more than just enough to provide clearance for the sprocket teeth.An essential part of any chain drive is the sprocket.A chain drive requires a sprocket on the driving shaft and another on the driven shaft.Chain drives sometimes contain additional sprockets,used for additional power take-offs or for taking up chain slack.When used to take up chain slack,they are known as idlers.Idlers should be mounted on the slack side,not on the tight side.It is desirable to have an adjustment for idler positioning where possible.Fig.4-5 showsa roller-chain sprocket.Sprocket teeth are standardized to accommodate the roller chain.Various sizes of sprockets may be used,and several types are available.The simplest type is one without a hub.Sprockets are also available with hubs on one side or on both sides.Special arrangements are also possible.Certain of these are used in conjunction with a shear-pin hub;the shear pin is designed to fail in case of an accidental or unexpected overload.Some types can be installed on large lineshafts;these sprockets are made in two parts so that they can be installed without disconnecting the long length of shafting.Smaller sprockets are usually made solid;large ones are sometimes constructed with arms or spokes to reduce weight.In general,the selection of a sprocket depends on the type of application.链传动链传动在机械领域中占据了独特的地位。
章跃机械制造工程专业英语---Lesson 2 Hardening and Tempering
Lesson 2 Hardening and TemperingPlain carbon steel has been valued from early time because of certain properties. This soft silver-gray metal could be converted into a superhard substance that would cut glass and many other substances, including itself when soft. Furthermore, its hardness could be controlled. This converting of carbon steel into a steel of useful hardness is done with different heat treatments, two of the most important of which are hardening and tempering (drawing), which you will investigate in this lesson.Hardening by quenchingAs steel is heated above the lower critical temperature of 1330F (721C), the carbon that was in the form of layers of iron carbide in pearlite begins to dissolve in the iron and form a solid solution called austenite. When this solution of iron and carbon is suddenly cooled or quenched, a new microstructure is formed. This is called martensite. Martensite is very hard and brittle, having a much higher tensile strength than the steel with a pearlite microstructure. It is quite unstable, however, and must be tempered (drawn) to relieve internal stresses in order to have the ductility and toughness needed to be useful. AISI-C1095, commonly known as water-hardening tool (W1) steel, will begin to show hardness when quenched from a temperature just over 1330F (721C) but will not harden at all if quenched from a temperature lower than 1330F (721C). This steel will become as hard as it can get when heated to 1450F (788C) and quenched in water. This quenching temperature changes as the carbon content changes. It should be 50F (28C) above the upper critical temperature for carbon steels containing less than 0.83 percent carbon. The reason carbon steel ,less than eutectoid, should be heated above theupper critical temperature is that the ferrite is not all transformed into austenite below this point, and when quenched, is retained in the martensitic structure. The retained ferrite causes brittleness even after tempering.Low carbon steels such as AISI 1020 will not, for all practical purpose, harden when they are heated and quenched. Oil- and air-hardening steels have a higher hardenability and do not have to be quenched as rapidly as plain carbon steels. Consequently, they are deeper hardening than water hardening types, which must be cooled to 200F within 1 or 2 seconds. Plain carbon steels containing 0.83 percent carbon can get as hard (RC67) as any plain carbon steel containing more carbon.TemperingTempering, or drawing, is a process of reheating a steel part that has been previously hardened to transform some of the hard martensite into softer structures. The higher the tempering temperature used, the more martensite is transformed, and the softer and tougher (less brittle) the piece becomes. Therefore, tempering temperatures are specified according to the strength and ductility desired. Mechanical properties charts, which may be found in steel manufacturers’handbooks and catalogs, give these data for each type of alloy steel.A part can be tempered in a furnace or oven by bringing it to the required temperature and holding it there for a length of time, then cooling it in air or water. Some tool steels should be cooled rapidly after tempering to avoid temper brittleness.Tempering should be done as soon as possible after hardening. The part should not be allowed to cool completely, since untempered it contains very high internal stresses and tends to split or crack. Tempering will relieve the internal stresses. A hardened part left overnight without tempering may develop cracks by itself.New words 学习1.hardening 淬火2.temper 回火3.convert 转变4.value 重视，尊重……Notes1. This soft silver-gray metal could be converted into a superhard substance that would cut glass and many other substances, including itself when soft.这种银灰色的软金属能够转变成一种超硬的物质，该物质可以切削玻璃和许多其它物质，包括处于软状态时的该金属本身。
《机械专业英语unit》课件
Example analysis
Case Studies
Analyze real world case studies to demonstrate practical applications of mechanical writing
Compare and Contrast
Compare different writing styles and techniques to identify best practices
Standard expression: Mechanical English requires standardized and rigorous expression, in accordance with industry standards.
02
Common vocabulary and expressions in mechanical engineering English
Language accuracy
Use precision language and avoid technical errors
Clarity
Use simple language and avoid jargon to ensure the reader easily understands the content
Writing Standards
01
02
03
04
APA Style: Follow the American Psychological Association (APA) style guide for formatting and citations
APA Style: Follow the American Psychological Association (APA) style guide for formatting and citations
机械工程专业英语__第1课
Lecture 1
Introduction 引言
1.1 什么是专业英语
普通英语（Common English, Ordinary English）
科技英语（English for Science and Technology）
2.1 Grammar Features
3) We must do various experiments before a new electronic product is designed. Before designing a new electronic product we must do various experiments.
或专业都会有其特定的一套精确而含义狭窄的名词和术语。专业英语的学习需要 有一个良好的英语基础，同时也要注意其自身的词汇特点、语法特点、修辞 特点和翻译特点等等。
1.2 学习专业英语的重要性
(1) 科研信息获取 专业英语阅读能力
当前大部分资料都可以通过互联网传播，而这些资料中90％以上都 是英语。
世界上科技情报资料的交流主要靠使用英语,对子电气工程、电子工 程和信息类等专业来说，绝大部分专业资料和信息都是以英语形式出 观。
2.1 Grammar Features
③ 不定式
用不定式短语来替代表示目的和功能的从句或语句 (1) The capacity of individual generators is larger and larger so that the increasing demand of electric power is satisfied.
2.1 Grammar Features
机械工程英语(Part1U)
Lathe - A machine tool that rotates a workpiece while cutting tools are applied to shape it.
Sander - A power tool used to sand or polish surfaces, often made of sandpaper or emery paper.
Second Law of Thermodynamics
The law that states that entropy in a closed system always increases.
Combustion Thermodynamics
The study of the conversion of fuel into energy.
Mechanical Engineering English (Part 1)
目录
• Overview of Mechanical Engineering
• Fundamentals of Mechanical Engineering
• English vocabulary for mechanical engineering
Fracture Mechanics The study of the failure of materials due to applied stress.
Thermodynamics
First Law of Thermodynamics
The law that states that energy can neither be created nor destroyed, but can be transformed from one form to another.
机械工程专业英语课件--L01
Mechanical Efficiency is the ratio of work input to work output. It is often expressed as a percentage. The efficiency of an ideal machine is 100 % but an actual machine's efficiency will always be less than 100% because of the Second law of thermodynamics which states that the quality of energy will decay, eventually becoming heat. This means that some of the work put into the system is transformed (lost) into thermal energy (heat). In a mechanical system, friction is the most common cause of the work lost to heat.
A baseball pitcher does positive work on the ball by transferring energy into it .
预备知识
机械工程专业英语
Lesson 1 Basic Concepts in Mechanics 一、Background Information
kilograms.
课文分析
机械工程专业英语
Lesson 1 Basic Concepts in Mechanics One common device is an inclined plane--- in this case, a loading ramp that slopes from the ground to the
机械类专业英语阅读教程第一章部分翻译
1. Metals and Their UseIt is known that metals are very important in our life. Metals have the greatest importance for industry. All machines and other engineering constructions have metal parts; some of them consist only of metal parts.There are two large groups of metals:1) Simple metal- more or less pure chemical elements2) Alloys - materials consisting of a simple metal combined with some other elements.About two thirds of all elements found in the earth are metals, but not all metals may be used in industry. Those metals which are used in industry are called engineering metals. The most important engineering metal is iron , which in the form of alloys with carbon and other elements, finds greater use than any other metal. Metals consisting of iron combined with some other elements are known as ferrous metals; all the other metals are called nonferrous metals. The most important nonferrous metal are copper , aluminum , lead , zinc , tin , but all these metals are used much less than ferrous metals, because the ferrous metals are much cheaper.Engineering metals are used in industry in the form of alloys because the properties of alloys are much better than the properties of pure metals. Only aluminum may be largely used in the form of simple metal. Metals have such a great importance because of their useful properties or their strength, hardness, and their plasticity .Different metals are produced in different ways, but almost all the metal are found in the forms of metal ore (iron ore, copper ore, etcet cetra.)The ore is a mineral consistence of a metal combined with some impurities . In order to produce a metal from some metal ore, we must separate these impurities from the metal that is done by metallurgy .2. Plastics and Other MaterialsPlastics have specific properties which may make them preferable to traditional materials for certain uses. In comparison with metals, for example, plastics have both advantages and disadvantages. Metals tend to be corroded by inorganic acids , such as sulphuric acid and hydrochloric acid. Plastics tend to be resistant to these acids, but can have dissolved or deformed by solvent , such as carbon tetrachloride , which have the same carbon base as the plastics. Color must be applied to the surface of metals, whereas it can be mixed in with plastics. Metals are more rigid than most plastics while plastics are very light, with a specific gravity normally between 0.9 and 1.8. Most plastics do not readily conduct heat or electricity . Plastics soften slowly and can easily be shaped when they are soft.塑料具有特殊的性能。
《机械工程专业英语教程》课文翻译
机械工程专业英语教程第一课：机械工程简介Introduction to Mechanical EngineeringSection 1: OverviewMechanical engineering is a diverse and dynamic field that encompasses the design, development, and operation of machinery, structures, and systems. This branch of engineering plays a crucial role in various industries, including automotive, aerospace, manufacturing, and energy.Section 2: Responsibilities and SkillsAs a mechanical engineer, your responsibilities will include designing and analyzing mechanical systems, conducting tests and experiments, and supervising the manufacturing process. You will also need to have a strong understanding of physics, mathematics, and computer-aided design (CAD). Additionally, problem-solving skills, attention to detail, and the ability to work well in teams are essential.Section 3: Career OpportunitiesA degree in mechanical engineering can open up a wide range of career opportunities. You could work in research and development, product design, manufacturing, or projectmanagement. Mechanical engineers are in demand in almost every industry, ensuring a stable and rewarding career path.Section 4: University CoursesTo become a mechanical engineer, it is essential to pursue a degree in mechanical engineering from a reputable university. The curriculum typically includes courses in engineering principles, materials science, thermodynamics, fluid mechanics, and mechanical design. Additionally, practical training through internships or cooperative education programs is crucial for gaining hands-on experience.Section 5: ConclusionMechanical engineering offers a challenging and rewarding career for those with a passion for solving problems and a desire to create innovative solutions. With the right education and skills, you can embark on a successful journey in the field of mechanical engineering. Remember, the possibilities are endless in this ever-evolving discipline.第二课：机械设计基础Fundamentals of Mechanical DesignSection 1: IntroductionIn this lesson, we will explore the fundamentals of mechanical design. Mechanical design involves the creation and development of physical systems and components that meet specific requirements and specifications. This processrequires a deep understanding of materials, mechanics, and engineering principles.Section 2: Design ProcessThe design process typically follows a systematic approach that includes several stages. These stages include problem identification, conceptual design, detailed design, manufacturing, and testing. Each stage involves various activities such as brainstorming, prototyping, and evaluation.Section 3: Design ConsiderationsDuring the design process, there are several important considerations to keep in mind. These include functionality, efficiency, reliability, safety, and cost-effectiveness. It is also crucial to consider the environmental impact and sustainability of the design.Section 4: Tools and SoftwareTo aid in the design process, engineers use various tools and software. Computer-aided design (CAD) software allows for precise modeling and simulation of mechanical systems. Finite element analysis (FEA) software helps in analyzing the structural integrity and performance of designs.Section 5: Case StudyTo further understand the application of mechanical design principles, we will examine a case study. This real-world example will demonstrate how the design process isimplemented to solve a specific problem and achieve desired outcomes.Section 6: ConclusionMechanical design is a critical aspect of mechanical engineering. It requires a combination of creativity, technical knowledge, and attention to detail. By mastering the fundamentals of mechanical design, you will be well-equippedto tackle complex challenges and contribute to the development of innovative solutions.以上是《机械工程专业英语教程》的课文翻译。
(机械制造行业)机械用英语
金属切削metal cutting机床 machine tool金属工艺学technology of metals刀具 cutter电路 circuit半导体元件 semiconductor element 反应 feedback发生器 generator直流电源 DC electrical source门电路 gate circuit逻辑代数logic algebra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摩擦 friction联络 link传动 drive/transmission弹性 elasticity频次特征 frequency characteristic 响应 response定位 allocation机床夹具jig动力学 dynamic运动学 kinematic静力学 static剖析力学 analyse mechanics拉伸 pulling压缩 hitting剪切 shear扭转 twist曲折应力bending stress强度 intensity三相沟通电 three-phase AC磁路 magnetic circles变压器 transformer异步电动机 asynchronous motor几何形状 geometrical正弦形的sinusoid沟通电路AC circuit机械加工余量 machining allowance 变形力 deforming force 磨粒 abrasive grain联合剂bonding agent砂轮 grinding wheel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铣削 mill铣刀 milling cutter功率 power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卡盘 chuck加工中心machining center车刀 lathe tool钻削镗削 bore车削 turning磨床 grinder基准 benchmark钳工 locksmith拉床 broaching machine拉孔 broaching流体动力学fluid dynamics流体力学fluid mechanics液压 hydraulic pressure切线 tangent机电一体化 mechanical-electrical integration气压 air pressure pneumatic pressure 稳固性介质 medium无效 invalidation强度 intensity载荷 load应力 stress安全系数safty factor靠谱性 reliability磨损 wear耐用度 durability随机信号random signal失散信号discrete signal超声传感器 ultrasonic sensor集成电路 integrate circuit 挡板orifice plate 套筒 sleeve扭力 torsion过盈配合interference fit摄像头 CCD camera优化设计optimal design工业造型设计 industrial moulding design有限元 finite element 铣床 millingmachine钻床 drill machine镗床 boring machine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电化学腐化 electrochemical corrosion车架 automotive chassis悬架 suspension板料冲压 sheet metal parts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装置图 assembly drawing尺寸标明 size marking技术要求 technical requirements刚度 rigidity内力 internal force位移 displacement截面 section疲惫极限fatigue limit断裂 fracture塑性变形 plastic distortion 脆性资料 brittleness material 刚度准则 rigidity criterion 运动简图 kinematic sketch 虚拘束passive constraint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游标卡尺slide caliper千分尺 micrometer calipers攻丝 tap二阶队列式 second order determinant逆矩阵 inverse matrix线性方程组 linear equations概率 probability随机变量random variable摆列组合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cofactorball：滚珠ball screw ：滚珠丝杆：直线导轨linear guide：扭矩,转矩torquedynamic torque：动向扭矩specification：规格static moment：静力矩preload：预载 ; 预加负荷accuracy grade：正确度级别geometrical moment of inertia 几何惯性矩 ,断面转动惯量polar moment of inertia of area 面积 /断面惯性极矩center of gravity：重心rail moment of inertia：转动惯量radial direction：径向vertical direction ：垂直方向 lateral direction：横向rolling direction ：轧制方向，转动方向pitching direction ：俯仰方向yawing direction：回旋方向repeatability：可重复性 , 频频性 , 再现性，running：不停的 , 连续的parallelism：平行度running parallelism：连续的挪动平行度backlash：空隙精度 precision螺钉 screw流体动力学fluid dynamics流体力学fluid mechanics加工 machining液压驱动泵fluid clutch液压泵 hydraulic pump阀门 valve无效 invalidation螺纹 thread螺旋 helix剩余应力residual stress冷加工 cold machining电动机 electromotor汽缸 cylinder滚齿 hobbing插齿 gear shaping伺服电机actuating motor 步进电机stepper motor丝杠 screw rod导轨 lead rail组件 subassembly转向器redirector变速器speed changer机械夹具Spanner扳手adjustable spanner, monkey wrench活络扳手box spanner 管钳子(美作 :socket wrench) calipers 卡规pincers, tongs 夹钳shears 剪子hacksaw 钢锯wire cutters 剪线钳multipurpose pliers, universal pliers 全好手钳adjustable pliers 可调手钳punch 冲子drill钻chuck 卡盘scraper 三角刮刀reamer 扩孔钻calliper gauge 孔径规oil can 油壶jack 工作服grease gun 注油枪机械加工抛光 polishing安装 to assemble衬套 bushing半机械化 semi-mechanization; semi-mechanized 半自动滚刀磨床 semi-automatic hob grinder半自动化semi-automation; semi-automatic扳手 wrench边刨床 side planer变速箱 transmission gear柄轴 arbor零件 units; assembly parts插床 slotting machine拆卸 to disassemble超高速内圆磨床ultra-high-speed internal 车床 lathe; turning lathe车刀 lathe tool车轮车床car wheel lathe车削 turning车轴 axleAutoCAD 机械制图英语词汇tab 附签标签table 表表格tablet 数字化仪数位板 tabsurf 平移曲面板展曲面 tabulated surface 平移曲面板展曲面Tag 标记标签tangent a. 相切（的） n. 切线切点tangential 相切相切Taper Faces 倾斜面锥形面Taper Faces 倾斜面锥形面tapered polyline segments 锥状多段线线段锥状聚合线段tapering 锥状锥形target 目标（点、对象）目标target box 靶框目标框template drawing 样板图样板图面temporary files 暂时文件暂存档terminate 停止停止tessellation lines 素线镶嵌线tesslated text 嵌花文字Test 测试测试tetrahedron 四周体四周体text 文字， sometimes 文本文字text color 文字色文字颜色text control codes 文字控制代码text editor 文本编写器文字编写器text fonts 字体字体text height 字高文字高度text justification 文字对齐文字对正text properties 文字特征文字性质text style 文字款式字型textscr 文本屏文字萤幕 Textual文本（的）文字 texture map 纹理贴图材质贴图 thaw 解冻解冻thickness 厚度厚度threshold 阈（值）临界值thumbnail 略图thumbnail preview image略图/缩图预览图像Tick 标记短斜线tilde 波涛号波涛符号(~)tile horizontal 水平平铺非重叠水平式tile vertical 垂直平铺tiled viewports 平铺视口非重叠视埠tilemode 平铺模式非重叠模式tilemode 平铺模式非重叠模式time 时间时间Timeout 超时逾时title block 标题栏标题栏toggle 开关，切换切换token 标记记号tolerance 公差公差toolbar 工具栏工具列top view 俯顶视图上视景topology 拓扑构造拓朴toroidal 环形圆环形torus 圆环（体 /面）圆环体trace 宽线追踪 ,等宽线Trace 追踪追踪 ,等宽线Trailing 后续结尾transform 变换变换Translation 平移转译Transparency 透明透明度transparent 图像透明度透通式transparent command 透明命令透通指令Tree View 树状图treestat 树状构造树构状态triangle 三角形三角形trim 修剪修剪tripod 三轴架三向轴trunctuate 截短 截断 tube 管，圆管 圆管 Turbulence 扰动 乱流 tutorials 教程 导览 Twist 歪曲 扭转 Type 种类 键入ucsicon UCS 图标 USC 图示 UCSICON UCS 图标 USC 图示 undefine 命令撤消 撤消定义 underflow 下溢 低溢underline 下划线 底线 undo 放弃 还原Unhide 显示 撤消隐蔽 Unhide 显示 撤消隐蔽uninstall 删除安装 排除安装 union 并集 联集 Unload 卸载 开释unnamed blocks 无名块 未具名块 updating 更新 更新Upside Down 倒置 上下颠倒user coordinate system 用户坐标系 (UCS) Validation 校验 查验 variable 变量 变数 vector 矢量 向量Vein Color 纹理颜色 纹路颜色 vertex 极点 极点vertical dimension 垂直标明 垂直标明 vertices 极点 极点video display 视频播放 视频显示器 view 视图 视景View Aligned 对齐阅读 对齐视景 viewpoint 视点 检视点viewport 视口 视埠viewport configuration 视口配置视埠规划 viewres 显示精度 视景分析度virtual screen display虚屏显示虚构萤幕显示visibility 可见性 可见性volumetric shadows 体积暗影 体积暗影vplayer 视口图层 视埠图层控制 vpoint 设置视点 检视点 vports 多视口 视埠vslide 观看幻灯 检视幻灯片 warning 警示 警示wblock 写块 制作图块wedge 楔体表面 楔形体Weight 权值 权值weld 接合 接合What's new 新特征 新增功能 Width 宽度 宽度Window 窗口 窗选window polygon 窗口多边形 多边形窗选 wire 连线 线素wireframe model 线框模型 线架构模型word wrap 词语换行 文字折行working drawing 工作图形 工作图面World Coordinate System (WCS) 世界坐标系xbind 外面参照绑定 外面并入 Xdata 外面数据 延长资料 xline 参照线 建构线xplode 分解 炸开xref 外面参照 外面参照Xref Log 外面参照记录文件 外面参照记录 xref-dependent layer 依靠外面参照的图层 xref-dependent layer 依靠外面参照的图层 xrefs (external references) 外面参照zoom 缩放 缩放Zoom limits 图限缩放 缩放范围 Zoom Previous 缩放到上一次 缩放上一次dangle 不固定的 悬挂Dark Color 暗色 暗色dash 虚线 虚线data integrity 数据完好性 资料完好性 database 数据库 资料库datum 基准 基准面datum axis 基准轴 基准轴datum dimension 基准标明 基准标明 datum identifier 基准表记 基准辨别字 datum reference frames 基准参照框架 datum reference letters 基准参照字母、文字 dbConnect 数据库连结 资料库连结 dbConnect Manager 数据库连结收理器dblist 数据库列表 资料库列示DBMS drivers DBMS 驱动 资料库管理系统 ddattdef 属性定义对话框 动向属性定义 ddatte 属性编写对话框 动向属性编写 ddattext 属性提取对话框 动向属性萃取 ddcolor 颜色对话框 动向颜色设定ddedit 文字编写对话框编写文字与属性定义ddgrips 夹点对话框动向掣点设定 ddim 标明设置对话框标明设定 ddinsert 插入对话框图块插入 ddmodify 图元编写对话框动向改正 ddptype 点种类对话框点型式ddrename 重命名对话框动向更名ddrmodes 画图模式对话框画图设定ddselect 对象选择对话框动向选用设定dducs UCS 对话框动向 UCS 设定 dducsp UCS 方向对话框动向 UCS 预设 ddunits单位对话框动向单位设定 ddview 视图对话框动向视景ddvpoint 视点对话框动向检视点deactivate 开释停用 dealer 经销商经销商decal effect 修剪成效除掉杂质成效 decimal dimensions 十进制标明十进位标明 decurve 非曲线化直线化default 缺省预设值 ,预设default drawing 缺省图形预设图面default drawing 缺省图形预设图面definition point 定义点定义点Degenerate 退化退化 delay 延缓延缓delete 删除删除DELta 增量差值demand loading 按需加载应要求载入dependent symbols 依靠符号deployment 睁开布署Depth Map 深度贴图深度贴图derive 导出导出 description 说明描绘Design Center 设计中心设计中心detach 拆离分别Detection 检测侦测deviation 极限误差误差deviation tolerances 极限公差误差公差device 设施设施device 设施设施Device and Default Selection 设施和默认选择设施和预设值选用Dia 直径直径diameter 直径（标明）直径dictionary 词典词典diffuse color 漫射色漫射颜色digitizer 数字化仪数位板digitizing puck 数字化仪游标数位化指向器digitizing puck 数字化仪游标数位化指向器dim 标明标明dimaligned 对齐标明对齐式标明dimangular 角度标明角度标明dimbaseline 标明基线基线式标明dimcenter 圆心标明中心点标明dimcontinue 连续标明连续式标明dimdiameter 直径标明直径标明dimedit 标明编写标明编写dimension 标明标明dimension definition points 标明定义点dimension format 标明格式标明格式dimension geometry 组成因素标明几何dimension line arc 尺寸线圆弧标明线弧dimension properties 标明特征标明性质dimension scale 标明比率标明比率dimension style 标明款式标明型式dimension style families 标明款式族dimension style name 标明款式名dimension style overrides 标明款式代替dimension text 标明文字标明文字dimension units 标明单位标明单位dimension variables 标明变量标明变数dimlinear 线性标明线性标明 dimordinate 坐标标明座标式标明 dimoverride 标明代替标明代替 dimradius 半径标明半径标明 dimstyle 标明款式标明型式dimtedit 标明文字编写标明文字编写Direct Hatch 直接填补直接剖面Direction Control 方向控制方向控制Directory 目录目录Disable 禁用撤消 ,停用discard 放弃舍弃Discontinued 停止使用的撤消 ,停用dish 下半球面圆碟disk space 磁盘空间磁碟空间displacement point 位移点位移点display 显示显示器 , 显示 , 显示画面Display Order 显示序次显示次序dist 距离距离distant light 平行光远光源distributing 散布分别式dithering 颤动递色 diverge分别的分别的 Divide 平分平分divide 平分平分 Division 平分切割 ,除法 dock(undock) 固定（浮动）固定 document 文档文件dome 上半球面圆顶donut 园环环Draft 草图草图drafting standards 画图标准制图标准drafting techniques 画图技术制图技巧drag and drop 拖放拖放draw 绘制 /画图 (假如后边未接宾语 ) 画图drawing 图形图面 ,图档Drawing Aids 画图协助工具画图协助drawing area 画图地区画图区 drawing boundaries 图形界限图面界限 drawing browser 图形阅读器图面阅读器 drawing database 图形数据库图形资料库 drawing environment 图形环境画图环境 drawing extents 图形范围图面实质范围 drawing file 图形文件图档drawing limits 图形界线图面范围drawing order 图形序次画图次序drawing project 图形项目画图专案drawing scale 图形比率图面比率drawing standard 图形标准图面标准drawing status 图形状态图面状态drawing time 画图时间画图时间drawing units 图形单位图面单位driver 驱动程序驱动程式 DropdownList 下拉列表下拉式列示 dsviewer 俯视视图俯视视景dtext 动向文本动向文字dump 转储倾出 duplicate重复重复的 duplicating 复制复制 dview 动向察看动向检视 dxbin DXB 输入 DXB汇入 dxfin DXF 输入 DXF 汇入dxfout DXF 输出 DXF 汇出Dynamic 动向动向Dynamic Dragging 动向拖动动向拖曳Dynamic Update 动向更新动向更新dynamic viewing 动向察看动向检视dynamic zooming 动向缩放动向缩放edge 边边沿Edge Surface 界限曲面边沿曲面edgesurf 界限曲面边沿曲面editor 编写器编写器EDUCATION VERSION 教课版教育版effect 成效成效Element 元素元素elev 标高高程elevation 标高高程ellipse 椭圆椭圆embed 内嵌，嵌入嵌入Encapsulated 封装 See also EPS 压缩end 端点结束 ,终点end angle 端点角度结束角度end tangent 端点切向结束切点end width 端点宽度结束宽度Ending 停止端点English units 英制单位英制enter 输入entity 图元元件 . 图元entry 条目资料项environment 环境环境environment variable 环境变量环境变数equation 方程式方程式erase 删除删除existing 现有的既有的Exit 退出结束export 输出汇出expression 表达式表示式extend 扩展延长extend 延长，高出量（用于标明）延长extension line 尺寸界线延长线 Extent(s) 范围实质范围external data 外面数据外面资料external database外面数据库外面资料库External Reference 外面参照外面参照Extract 选集萃取extrude 拉伸挤出face 面面flat-shaded （平庸）着色facet 镶嵌面产生刻面floating viewports 浮动视口浮动视埠factor 因子 (see Scale Factor) 系数flood 充满大批弹出特征对话框、图示列性质fade 退色度渐层Flyout Propertiesfalloff angle 缩短角衰败角度fog 雾Fast Zoom mode 迅速缩放模式fold 折叠折痕fatal 致命错误致命错误Follow 跟从自动平面视景font 字体字体Favorites 珍藏夹我的最爱font map file 字体映照文件字体对映档Favorites 珍藏夹我的最爱form tolerance 形状公差成型公差feature 功能 /（几何）特点特点formatting text 设置文字格式格式化文字fence 栏选 (See also Selection fence) 篱选frame 框架画格field 字段栏位frame 帧画格file 文件档案frame 边框画格fill 填补填实free-form 自由形式（的）自由形式Filled Text填补文字 (用于填实线条、实体或实面 )freehand line 徒手画线手绘线Filmroll Filmroll 胶卷Freeplotting 自由画图自由出图filter 过滤器过滤器freeze 冻结冻结find 查找找寻工具freezing layers 冻结图层冻结图层finish 达成修饰From 自自finish 修饰（ for render only) 修饰Front Clipping On 前向剪裁翻开fit 自适应设置充满（用于预览时充满）front view 主视图前视景fit points 拟合点拟合点Full Preview 全视口预览完好flag 标记旗标带边框平庸着色Flat Shaded, Edges on。
《机械工程专业英语教程》课文翻译
Lesson 1 力学的基本概念1、词汇：statics [stætiks] 静力学；dynamics动力学；constraint约束；magnetic [mæɡ＇netik]有磁性的；external [eks＇tə:nl] 外面的, 外部的；meshing啮合；follower从动件；magnitude [＇mæɡnitju:d] 大小；intensity强度，应力；non-coincident [kəu＇insidənt]不重合；parallel [＇pærəlel]平行；intuitive 直观的；substance物质；proportional [prə＇pɔ:ʃənəl]比例的；resist抵抗，对抗；celestial [si＇lestjəl]天空的；product乘积；particle质点；elastic [i＇læstik]弹性；deformed变形的；strain拉力；uniform全都相同的；velocity[vi＇lɔsiti]速度；scalar[＇skeilə]标量；vector[＇vektə]矢量；displacement代替；momentum [məu＇mentəm]动量；2、词组make up of由……组成；if not要不，不然；even through即使，纵然；Lesson 2 力和力的作用效果1、词汇：machine 机器；mechanism机构；movable活动的；given 规定的，给定的，已知的；perform执行；application 施用；produce引起，导致；stress压力；applied施加的；individual单独的；muscular [＇mʌskjulə]]力臂；gravity[ɡrævti]重力；stretch伸展，拉紧，延伸；tensile[tensail]拉力；tension张力，拉力；squeeze挤；compressive 有压力的，压缩的；torsional扭转的；torque转矩；twist扭，转动；molecule [m likju:l]分子的；slide滑动; 滑行；slip滑，溜；one another 互相；shear剪切；independently独立地，自立地；beam梁；compress压；revolve (使)旋转；exert [iɡ＇zə:t]用力，尽力，运用，发挥，施加；principle原则, 原理，准则，规范；spin使…旋转；screw螺丝钉；thread螺纹；2、词组a number of 许多；deal with 涉及，处理；result from由什么引起；prevent from阻止，防止；tends to 朝某个方向；in combination结合；fly apart飞散；3、译文：任何机器或机构的研究表明每一种机构都是由许多可动的零件组成。
机械设计制造及其自动化专业英语UnitMechanicalPropertiesofMaterialsPPT课件
精品课件 14
Mechanical properties
• In the actual plotting of the curve, the proportionality limit is obtained at a slightly lower value of the load than the elastic limit.
• torsion n. 扭转；转矩 [ˈtɔ:rʃən]
• impact n. 冲击；冲力；影响 [ˈɪmpækt]
• fatigue n. 疲劳 [fəˈti:ɡ]
• creep n. 蠕变 [kri:p]Leabharlann •specimen
n.
试件；试样 精品课件
[ˈspesimin]
1
Mechanical Properties of Materials
精品课件23mechanicalpropertiesmaximumloadoriginalcrosssectionalarea?lt?mittensilestrengthtensilestrength最大荷载值s除以试件的横截面积为金属的极限最大拉伸强度或简单地称为拉伸强度精品课件24mechanicalpropertieslogicallyspeakingonceelasticlimitmetalshouldstartsfinallybreakwithoutanyincreasecurverecordsincreasedstressevenafterelasticlimit逻辑上来说一旦超过弹性极限金属应该就会屈服直至最后断裂在应力值上应该没有增加
(完整版)机械制造专业英语
1.3 BASIC MOTIONS IN MACHINE TOOLS 1.4 ASPECTS OF MACHINING TECHNOLOGY
1.3 BASIC MOTIONS IN MACHINE TOOLS
In conventional machine tools, a large number of product features are generated or foE TOOL
MACHINING PRODUCTIVITY
PRODUCT DESIGN FOR ECONOMICAL MACHINING
1.4.2
1.4.4
1.4.6
1.4.1
WORKPIECE MATERIAL
1.4.3
1.4.5
ACCURACY AND SURFACE
INTEGRITY
1.4 ASPECTS OF MACHINING TECHNOLOGY
Machining technology covers a wide range of aspects that should be understood for proper understanding and selection of a given machining technology. Tooling, accessories, and the machine tool itself determine the nature of machining operation used for a particular material. As shown on the right-hand side of Figure 1.7, the main objective of the technology adopted is to utilize the selected machining resources to produce the component economically and at high rates of production. Parts should be machined at levels of accuracy, surface texture, and surface integrity that satisfy the product designer and avoid the need for postmachining treatment, which, in turn, maintains acceptable machining costs. The general aspects of machining technology include:
机械工程专业英语PPT课件
Bearing
A device that supports, guides, and reduces the friction of
motion between fixed and moving machine parts. 轴承：在机器的固定和运动部件之间起支撑、引导和减 少运动摩擦的装置。
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Lesson 1 Basic Concept in Mechanics
Terminology 术语,专有名词
[,tə:mi'nɔlədʒi]
Text tour
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《机械工程专业英语教程》
Terminology
Gear 齿轮, 传动装置
1.A toothed machine part, that meshes with another toothed part to transmit motion or to change speed or direction. 齿轮：有齿的机器零件，与另一个有齿零件相啮合，从而传 递运动或者改变运动的方向或速度。
唐一平主编：《先进制造技术》北京：机械工业出 版社，2004；
王慧莉，贾卫国编《国际学术交流英语》大连：大 连理工大学出版社，2005
主要教学内容
Lesson 1 Basic Concept in Mechanics Lesson 2 Forces and Their Effects Lesson 3 Overview of Engineering Mechanics Lesson 4 Shafts and Couplings Lesson 5 Shafts and Associated Parts Lesson 6 Belts, Clutches, Brakes, and Chains Lesson 7 Fasteners and Springs Lesson 14 Physical Properties of Materials Lesson 29 Tolerances and Surface Roughness Lesson 35 Coordinate Measuring Machine Lesson 36 Lathes
机械工程专业英语Lesson 1
2017/1/13
《机械工程专业英语教程》
6
Text tour
The branch of scientific analysis which deals with motions, time, and forces is called mechanics and is made up of two parts, statics and dynamics. Statics deals with the analysis of stationary systems, i.e., those in which time is not a factor, and dynamics deals with systems which change with time. 对运动、时间和作用力做出科学分析的分支称为力学。 它由静力学和动力学两部分组成。静力学对静止系统进 行分析，即在其中不考虑时间这个因素，动力 学则是对随时间而变化的系统进行分析。
•
Harmonic gear drive 谐波齿轮传动
• 2. A complete assembly that performs a specific function in a larger machine • 传动装置：一套装置，在一个更大机器中有具体的功能
2017/1/13 《机械工程专业英语教程》 2
在分析由于外力的作用所引起物体内部的应力和应变时， 不能采用刚体假设。这时，我们认为物体能够变形。这 样的分析通常被称为弹性体分析，这时所用的假设为， 物体在作用力的范围内是弹性的。
2017/1/13
《机械工程专业英语教程》
11
Mechanics deals with two kinds of quantities: scalars and vectors. Scalar quantities are those with which a magnitude alone is associated. Examples of scalar quantities in mechanics are time, volume, density, speed, energy, and mass. Vector quantities, on the other hand, possess direction as well as magnitude. Examples of vectors are displacement, velocity, acceleration, force, moment, and momentum. 力学涉及到两种类型的量：标量和矢量。标量是那些只 有大小的量。在力学中标量的例子有时间，体积，密度， 速率，能量和质量。另一方面，矢量既有大小又有方向。 矢量的例子有位移，速度，加速度，力，力矩和 动量。
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Lesson 1 Mechanical Properties of Metals
Mechanical properties are the characteristic responses of a material to applied forces. These properties fall into five broad categories: strength, hardness, elasticity, ductility, and toughness.
Strength is the ability of a metal to resist applied forces.
Strength properties are commonly referred to as tensile strength, bending strength, compressive strength, torsional strength, shear strength and fatigue strength.
Tensile strength is that property which resists forces acting to pull the metal apart. It is one of more important factors in the evaluation of a metal.
Compressive strength is the ability of a material to resist being crushed. Compression is the opposite of tension with respect to the direction of the applied load. Most metals have high tensile strength and high compressive strength. However, brittle materials such as cast iron have high compressive strength but only a moderate tensile strength.
Bending strength is that quality which resists forces from causing a member to bend or deflect in the direction in which the load is applied. Actually a bending stress is a combination of tensile and compressive stresses.
Torsional strength is the ability of a metal to withstand forces that cause a member to twist.
Shear strength refers to how well a member can withstand two equal forces acting in opposite directions.
Fatigue strength is the property of a material to resist various kinds of rapidly alternating stresses. For example, a piston rod or an axle undergoes complete reversal of stresses from tension to compression. Bending a piece of wire back and forth until it breaks is another example
of fatigue strength.
Hardness is that property in steel which resists indentation or penetration. Hardness is usually expressed in terms of the area of an indentation made by a special ball under a standard load, or the depth of a special indenter under a specific load.
Elasticity is the ability to spring back to original shape. Auto bumpers and all springs should have this quality.
Ductility is the ability to undergo permanent changes of shape without rupturing. Modern, deep-formed auto bodies and fenders, and other stamped and formed products must have this property.
Toughness is the ability to absorb mechanically applied energy. Strength and ductility determine a material’s toughness. Toughness is needed in railroad cars, automobile axles, hammers, rails, and similar products.
New Words学习
1.Mechanical 力学的，机械的
2.Response 反应，响应，答复
3.Broad 主要的，概括的
4.Category 种类，类别
……
Notes
1.Tensile strength is that property which resists forces acting
to pull the metal apart.
抗拉强度是金属抵抗外力把它拉断的能力。
句中关系代词which 引导一定语从句修饰property。
在从句中which 作主语。
此外，在该从句中，现在分词短语acting to pull the metal apart 作定语修饰forces。
Pull……apart意为“把……拉开，把……拉断”。
pression is the opposite of tension with respect to the direction of the applied load.
压缩时载荷的方向与拉伸时的载荷方向相反。
该句中介词短语with respect to the direction of the applied load 作全句的状语。
3.Hardness is usually expressed in terms of the area of an indentation made by a special ball under a standard load, or the depth of a special indenter under a specific load.
硬度通常用在标准载荷作用下特制球产生的压痕面积来表示，或用特定载荷下专门压头所形成的深度来表示。
句中the area…a standard load和the depth…a specific load为并列的两个名词性短语，通过等立连词or连接，它们都是短语介词in terms of 的宾语。
介词短语in terms of…a specific load作全句的状语。