提出了冲压元的概念 ,阐述了AOS树表示方法 ,提出利用冲压元与AOS树建立冲压工艺模型。首先描述冲压件各特征的冲压工艺AOS树表达 ,然后以此为基础描述特征组合的冲压工艺AOS树表达 ,该描述方式符合工艺设计分阶段、分层次、从局部到全局的规律。最后以一具体的冲压件实例说明AOS树表示方法。 The concept of stamping element is put forward, the method of AOS tree representation is expounded, and a stamping process model using stamping element and AOS tree is proposed. Firstly, the AOS tree of stamping process, which describes the characteristics of the stamping parts, is described. Based on this, the stamping process of the AOS tree is described. The method is in accordance with the rules of process design in stages, at different levels and from the local to the global. Finally, a concrete stamping example illustrates the AOS tree representation.