模具专业英语

(99页)

'模具专业英语'
Unit Five CAD/CAM/CAE Passage One AutoCAD Passage Two The Computer in Die Design Passage Three CAD/CAM Passage Four Computer Integrated Manufacturing System Passage Five CAE Unit Five CAD/CAM/CAE 1 Passage One AutoCAD CAD① is a technique of using a computer to create, modify,and refine a design②. It, normally used in engineering departments, has greatly changed these departments. Drawings used to be made on paper with pencil or pen and drawing instruments . The drawings were very time -intensive to produce. They were then copied, and the copies were sent to the floor for production. The originals were stored in large drawers. Even a small job shop could have thousands of large blueprints on file . If changes were necessary, the engineer would get the original out of the file drawer, make the changes, copy it, and send the new print toUnit Five CAD/CAM/CAE the floor. Nowadays the computer can eliminate the need for all of the physical storage of prints. The computer also allows for rapid and easy modifications . The engineer or designer first draws the part on the screen of computer. This part drawing is the actual part geometry . The sizes and locations are all correct so that the information can be used later to create a program to machine the part③. Actually, you can also draw the geometry of a workpiece with CAD software on a computer. You may create the design model by applying graphics commands stored in the computer. Fig.5 -1 is a typical part drawing interface of AutoCAD software. You have complete freedom to zoom and view the model at differentUnit Five CAD/CAM/CAE Fig.5 -1 A typical part drawing interface of AutoCADUnit Five CAD/CAM/CAE orientations and then represent the design as a set of points, lines, arcs, and so on by using basic CAD software. Actually, graphics editing commands allow for easy modifications as required. AutoCAD is a Computer Aided Design(CAD) program used by just about every engineering and design office in the world. When you start AutoCAD, the AutoCAD window will open. The window is actually your design work space. How create a new drawing with AutoCAD? Firstly, you choose “New” from the“File” menu . The dialogue box will appear in the command window underside of the AutoCAD window. Secondly, you can choose“Start from Scratch”, under “Select Default Setting” select“English” or“Metric”, andUnit Five CAD/CAM/CAE then choose“OK”. In this way, the drawing opens with the default AutoCAD settings. Finally choose“Save As” from the “File” menu and enter a file name, then you can save the drawing. The AutoCAD interface has several different components, each of which provides different information of command options for the user(Fig.5 -2) ④. This diagram labels the most vital parts of the interface⑤. See Tab.5 -1. Unit Five CAD/CAM/CAE Fig.5 -2 AutoCAD interface componentsUnit Five CAD/CAM/CAE Not e s : ① CAD(computer aided design,计算机辅助设计)是美国Autodesk公 司于1982年在计算机上开发的绘图软件包,经过不断地完善,现已成为 国际上广为流传的绘图工具。 AutoCAD可以绘制任意二维和三维图形, 与传统的手工绘图相比,用AutoCAD绘图速度更快、精度更高。CAD技 术已广泛应用于机械、电子、航空、航天、汽车、船舶、轻工、纺织、 建筑等很多领域。 ② CAD is a technique of using a computer to create, modify, and refine a design. CAD是一种应用计算机生成、修改以及精化设计的 技术。 ③ The sizes and locations are all correct so that the information can be used later to create a program to machine the part. 尺寸和位置 必须完全正确,这样这些信息随后就可以用来编制加工该零件的程序。 “so that”引导一目的状语从句。例如:Speak louder so that everybody can hear you.Unit Five CAD/CAM/CAE ④ The AutoCAD interface has several different components, each of which provides different information of command options for the user(Fig.5 -2). AutoCAD界面由几个不同部分组成,每个部分都可为用户提供 不同的指令选择信息(图5 -2)。 “which”引导的非限制性定语从句修饰先行词“components”, “which”不能省略,也不能用that来代替。 provide ... for ...译为“为……提供……”。 ⑤ This diagram labels the most vital parts of the interface. 下表列出了界面上最重要的几个组成部分。 this和these常指后面将要提到的事物,有启下的作用;that和those 常指前面已经讲到的事物,起承上的作用。 例如:I will say this to you: He is an honest man. He felt ill. That is why he didn't come. Unit Five CAD/CAM/CAE New Words and Expressions : modify[ m dif i] v.更改,修改 refine[ri fain] v.精炼,精化 drawing instrument绘图仪器 instrument[ instrum nt] n.仪器;手段 time -intensive耗时的 floor[fl] n.车间 original[ rid n l] n.原始图; adj.原始的 job shop加工
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