专业英语大作业

数控技术应用专业英语2011-2012年度第二学期补考

姓名：______________________

学号：______________________

专业：______________________

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一、Translate the following sentences into Chinese. （20×2.5=50分）

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1.The CNC concept was proposed in the late 1940s.

数控的概念，提出了在20世纪40年代末。

C lathes are primarily used to rotate body workpieces with turning.

数控车床主要用于旋转与旋转体工件。

3.The program cannot be stored in some media.

该方案不能被储存在一些媒体上。

4.The world’s major industrialized countries don’t pay attention to the research and development of NC machining technology.

世界主要工业化国家不重视数控加工技术的研究和发展。

5.Vertical CNC lathes are used to turn large diameter disc -type workpieces.

立式数控车床是用来打开大直径圆盘型工件。

6.In the fifity years from the time the first NC machine tools came out to now, it

experienced six generation NC systems.

从第一数控机床出来到现在的时间fifity年，它经历了六代数控系统。

7.Headstock is the main component of CNC lathes.

主轴是数控车床的主要组成部分。

8.In terms of cost, the NC machine tool is always more expensive than the

general purpose machine tool.

数控机床是在成本方面，总是比通用机床更昂贵。

9.One of CNC lathe's main features is high production efficiency.

数控车床的主要特点之一是生产效率高。

10.NC machine tools generally consist of input device, servo system, measuring feedback device and the main body of the machine tool.

数控机床一般由输入装置，伺服系统，测量反馈装置和机床主体组成。

11.The modern NC system is capable of exchanging information by using

communication.

现代数控系统是通过通信交换信息的能力。

C machines have to be programmed，set up，operated and maintained by highly skilled personnel.

数控机床进行编程，设立，运作和维持高技能人才。

13.Eearly machine tools were designed so that the operator was standging in front of the machine while operating the controls.

eearly机床设计，使操作者在机器前standging经营的控制。

14.Most workpieces can be completed with one setup on a single machining center often.

一个经常在一个单一的加工中心设置就可以完成大多数工件。

15. Machining centers are classified as vertical，horizontal and universal machining center.

被列为纵向，横向和万能加工中心加工中心。

16.The main components of CNC machining center are bed，saddle，column，table and servo system etc.

数控加工中心的主要组成部分是床，马鞍，列，表和伺服系统等。

17.The tool changer can store tools and change it automatically.

换刀可以存储工具，它会自动改变。

C machine tools can solve the machining problems of complex parts.

数控机床可以解决复杂零件的加工问题。

19.Machining centers have automatic tool changing capabilities and tool magazine.

加工中心自动换刀功能和工具杂志。

20.The machining process is performed automatically so that the operator only needs so set tools, load/unload workpieces and change tools at the beginning of machining.

加工过程中会自动执行，使操作者只需要这样设置的工具，加载/卸载在开始加工工件和变化的工具。

二、Translate the reading material into Chinese. （20+10+20=50分）

1．A vertical machining center has the spindle oriented in the vertical position. An automatic tool changer is mounted to the machine（usually on the left side）to allow tools to be loaded into the spindle without operator intervention. Basic vertical machining centers will allow three directions of motion. Some vertical machining centers also have a rotary table or indexer mounted on the table to allow a workpiece to be rotated during machining.

A horizontal machining center has the spindle oriented in the horizontal position. An automatic tool changer is equipped to allow tools to be automatically placed in the spindle. The table of most horizontal machining centers can rotate by either an indexer or a rotary axis. If the machine has a rotary axis，the rotation is called the

B axis. A horizontal machining center is no more difficult to program than a vertical