关键词: 冲压件, 实例检索, 工艺相似, 相似度, 最近邻法

Abstract: To make full use of successful experiences of stamping process, a case retrieval methodology for stamping parts was proposed, which was based on the process similarity and the nearest neighbor technology. Firstly, features and constraints among the features were extracted from a threedimensional stamping part model. Then the material thickness, strength and hardness of the stamping part were obtained from its material information table. Furthermore, from the view of the process similarity, the similarity degree was calculated with a dualstep analysis between a new stamping part and old parts in the case library. In the first step, by calculating the topology relation similarity degree based on flats, a group of closer old cases were obtained and some old ones were removed with little similarity with the new ones. Thus, the search space of the next step was narrowed down. In the second step, by analyzing features, constraints and material between the new cases and the group of closer ones, the integration similarity degree was calculated. Moreover, the closest case was retrieved. Finally, a case study was used to reveal the effectiveness of this methodology.

Key words: stamping parts, case retrieval, process similarity, similarity degree, nearest neighbor technology