【摘要】 本文分析了级进模结构及零件特点，并在此基础上，提出一面向对象的约束关系树装配模型描述级进模结构及零件间的关系，为实现自顶向下的级进模结构及零件的设计奠定了基础。更多还原

【Abstract】 In this paper, the characteristics of progressive die structure is discussed, and an object-oriented model used to describe the constraint relation between parts of an assembly is presented. Based on this model, the Top-to-Down designing method for progressive die structure, can be implemented easily.更多还原