关键词: 数控工艺重用, 局部结构检索, 中轴变换, 相似性, 计算机辅助设计

Abstract: To realize the effective reuse of existing NC process,a NC process reuse oriented subpart retrieval approach of 3D CAD models was presented.The Medial Axis Transform (MAT) was introduced and adopted as the reference tool paths of a pocket,and the association between MAT and NC machining was elaborated.A rapid filtering method for accelerating subpart retrieval was presented to filter out infeasible subparts cases under the requirements of NC process reuse.A feature descriptor with multi-attributes fusion was extracted and the NC process reuse oriented subpart similarity assessment model was constructed.Experimental results showed that the approach could effectively support subpart retrieval for NC process reuse and satisfy the requirements of engineering application.

Key words: NC process reuse, subpart retrieval, medial axis transform, similarity, computer aided design