铸件毛坯模型生成方法研究

Generation of Casting Model for Cast-then-machined Parts

设计模型向制造模型的转换是实现CAD/CAPP/CAM集成的关键技术,而依据设计模型生成毛坯模型是其中关键环节,提出一种针对先铸造后机加零件的铸造毛坯模型生成方法。根据制造要求对模型表面进行分类;构造改进的扩展邻接属性图进行简单特征识别,依据铸造方法、铸件材质以及生产批量构造可铸造性判定算法,进行简单特征过滤;通过构造最小包络辅助面,并引入人工干预机加面分类机制,实现对包含非正交的表面加工边界面的零件模型的体加工特征包络,最终生成铸造毛坯模型。实例分析验证了算法的有效性与正确性。

The transformation from part design model to manufacturing model is the key technique to realize the integration of CAD/CAPP/CAM,and the key factor is the transformation from design model to blank model.A method of generating casting model for cast-then-machined part is proposed.The methodology is composed of classifying the part surfaces according to manufacturing requirements,constructing an improved extended attributed adjacency graphs（EAAG） to recognize simple features,filtering the castable simple features,enveloping the volumetric machining features containing nonnormal surfaces by means of constructing minimal enveloped auxiliary planes.An example is demonstrated to verify the validity and the effectiveness of the method.