关键词: 加工特征, 几何演变, 知识发现

Abstract: For the difficulties in machining knowledge mining,the geometric evolution of recognition on machining features in plan process was proposed to be the foundation of knowledge mining.The virtual machining datum attribution was presented,and the attributed adjacency graph of machining model was constructed,in which the corresponding faces were identified with the same global machining datum attribution.The integration of new faces,extinct faces and maintained faces were obtained by comparing graph of adjacent procedure.The broken faces,shape change faces and shape retentive faces were recognized by comparing parametric expression of corresponding maintained faces.The recognition algorithm of machining features changing was proposed,and the changing processes were recognized based on the relationship of different face type.The effectiveness of proposed recognition method was verified by an instance.

Key words: machining feature, geometric evolution, knowledge discovery