中文摘要：

针对基于实例的夹具设计中如何快速检索出相似实例的问题,提出了一种零件结构和工艺特征集合的有向工艺特征关系图概念,定义了有向工艺特征关系图同构属性的判定方法,并采用以零件结构特征和有向工艺特征关系图来构建夹具实例库。给出了零件工艺特征属性相似度计算方法,以零件工艺特征的关系及属性为特征,设计了面向零件结构和工艺特征的夹具实例检索算法。以变速杆零件为对象进行应用验证,证明了该方法在实际应用中的实用性和可行性。

英文摘要：

How to quickly retrieve a similar case is a key technology in the case-based fixture design. The concept of Directed Process Feature Relationship Graph （DPFRG） based on sets of part structure and process feature, and the judgment method of isomorphs attributes for DPFRG was put forward. The fixture case-base of process feature was constructed with DPFRG and process feature properties of parts. Algorithm to calculate the similarity of process feature attributes for parts was presented. Based on the process feature relationship and the properties of parts, the fixture case retrieval algorithm oriented to process feature and part structure was designed. Finally, an application example of a gearlever part demonstrated that the proposed approach was applicable and feasible.