关键词: 槽腔特征, 中轴变换, 加工刀具, 相似度, 数控加工

Abstract: To achieve the effective reuse of existing NC machining process,a similarity assessment method for pocket features based on Medial Axis Transform(MAT)was presented.A pocket feature was converted into 2D outline graph of machining region,and the graph's MAT was introduced and adopted as the reference tool path.Parameters of the Locally Inscribed Circles(LICs)were extracted,and the feasible domain of cutting tool radii and corresponding set of efficient cutting arc-lengths were constructed based on the dependence mapping relationship between radii of LICs and limit cutting tool.The effective representations of geometric attributes and machining attributes of cutting tools were realized.A hierarchical similarity assessment model was constructed and the global similarity of the two pockets was calculated.The experimental results showed that the method could be regarded as the judgment of NC process reuse and meet the requirement of engineering application.

Key words: pocket features, medial axis transform, cutting tools, similarity, numerical control machining