关键词: 计算机辅助工艺设计, 制造特征, 工艺信息模型, 轻量化模型

Abstract: To solve the integration and sharing problems of three-dimensional (3D) model between CAD and CAPP systems, a 3D product model information integration method based on lightweight model was proposed. A process information model based on lightweight model was established. A manufacturing feature extraction method based on lightweight model was presented. First, the boundary representation (B-rep) of the lightweight model was set up by designing the algorithm of extracting geometrical information from lightweight model and the method of judging adjacency relationship between adjacency surfaces, and then the boundary representation was compared with predefined form feature template in order to realize automatic recognition of manufacturing feature. Finally, a sample application was developed to illustrate the feasibility and validity of the proposed feature extraction method.

Key words: computer aided process planning, manufacturing feature, process information model, lightweight model, feature recognition