关键词: 型腔零件, 曲面加工, 特征识别, 过渡特征, 工艺规划

Abstract: To efficiently extract freeform machining feature from cavity parts,a novel approach was proposed and implemented by exploiting information implied in blend features.The blend features in mould cavity were recognized,and its types were determined based on type and number of seed faces.The character boundaries of blend feature were extracted to convert the surface information of blend feature into boundary information of machining feature.The topological faces of machining feature and the relation of features were recognized by making use of the shape and position information implied in the character boundary.Experimental results showed that the proposed approach was simple and feasible,and could efficiently recognize the freeform machining feature from cavity parts.The extracted data also could be integrated into CAD/CAM system to promote the integration of CAD and CAM.

Key words: cavity part, freeform machining, feature recognition, blend feature, process planning