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Summary

Computer-aided design is the use of computer graphics equipment to help designers to design work,

referred to as CAD. In engineering and product design, the computer can help the designer responsible for

computing, information storage and mapping and other work. Usually use a computer in the design of the

different options a lot of calculation, analysis and comparison to determine the optimal solution; a variety

of design information, regardless of numbers, text or graphics can be stored in computer memory or

external deposit, and can be quickly retrieved; designers typically start with a sketch design sketch into the

heavy work of the working drawing to the computer to complete; use of computer editing and graphics,

enlarge, shrink, pan and rotate about graphical data processing.

With the rapid development of modern computer technology, computer-aided design CAD (Computer

Aided Design) applications in the production of increasingly widespread, from computer-aided design in

mechanical production applications described in the mechanical design, a significant advantage and the

current application status and problems of the domestic enterprises of mechanical product development

process of three-dimensional CAD system analysis. Starting from the actual needs of product development

and product features and software functionality, enterprise applications, three-dimensional CAD process

improvement program, and finally the development trend of 3D CAD technology.

Keywords: computer-aided design, 2D,3D CAD application

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画椭圆弧

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画多边形

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平滑的技巧.....................................................................................................................................................................10

恢复一个已被删除的对象

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把多个对象排列成圆环形

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使对象放大或缩小

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取消层

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使线型正确显示

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预设置原型图中的层

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透明层

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将属性作为块的一部分

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