基于图和规则的混合式特征识别技术

The Hybrid Characteristics Identification Technology Based on the Diagram and Rules

制造特征的识别是解决CAD/CAPP/CAM间"自动化"孤岛的有效方法,以往的特征识别方法只是简单的把制造特征识别出来,并没有对其形状进行准确区分,而对于不同形状的同种类特征,加工方法却是不同的。针对这一问题,采用基于图和规则的混合识别方法,对零件的属性邻接图表示进行扩展,添加邻接面垂直属性,既将交互特征进行有效合理的分解,又对识别后的制造特征形状进行准确定义。使扩展图分解后能够准确表示零件的制造特征,从而使后续CAPP系统制定出来的加工工艺更准确,更有效。

Feature recognition is an effective method to solve the problem of product data exchange and sharing among CAD/ CAPP/CAM.The former methods only recognize the manufacturing feature,but don’t exactly distinguish the feature’s shape.In order to solve this problem,it extends the attributed adjacency graph,adds the vertical attribution of two adjacency faces,then combines the recognition rules with recognize feature.This method not only decomposes the interaction feature reasonably and effectively,but also defines the shape for feature of what is recognized.According to this hybrid recognition method,CAPP system can formulate a set of more effective process flow.