It USES process rules to realize step layout optimization for guaranteeing working precision of progressive punch die after obtaining keypoint and minimum number of working steps.

利用工艺规则，通过起始关键点的获取，最少工步数的确定，到排样的优化，来保证级进模的工作精度。

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In the die design, the use of spherical punch made the process of deep drawing and reverse redrawing achieved in one set of mold and common hydraulic press.

在进行模具设计时，采用半球形凸模等方式可以实现正、反拉深在一套模具，普通液压机上完成加工。

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Introduced design method and points of separation combined extruding die with ladder-shape punch in extruding die, stated extruding die design process and thought using practical example.

介绍了挤压型材模具中，具有阶梯式凸模的分流组合模设计的方法和设计要点，用实例阐述了该类型模具的设计过程和设计思路。

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