The deficiencies in current methods of cylinder design are studied and a new method for CAD software development-Computer-Aided-Design with varible structure is presented.

本文分析了目前液压缸设计方法的不足，提出了一种开发CAD软件的新方法——计算机辅助变结构设计方法。

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The DXF file format is one of the widely used graphics exchange formats in the graphics application development, and the lots of CAD software have supported it.

DXF文件格式是图形开发中最常用的图形交换格式之一，众多CAD软件都支持它。

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Formerly, In order to create the standardized parts quickly, the designer must cost more time and energy on the secondary development of the CAD software.

以往为了能在实际设计工作中快速方便的生成标准件，模具设计人员需事先花大量时间和精力对CAD软件进行二次开发建立模具标准件库。

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