基于加工元体的三维工序模型构建方法  

A 3D Process Model Construction Method based on Machining Volume

作　　者：邵立[1] 张树生[1] 白晓亮[1] 王荣荣[1] 

机构地区：[1]西北工业大学现代设计与集成制造技术教育部重点实验室,陕西西安710072

出　　处：《西北工业大学学报》2015年第4期644-650,共7页Journal of Northwestern Polytechnical University

基　　金：国家自然科学基金(51175434)资助

摘　　要：为了在三维CAPP系统中展现产品零件由毛坯状态向最终成品动态演变的过程,提出了一种以加工元体为基本单元的三维工序模型构建方法。首先,提出了制造特征及加工元体的表达方法,建立了属性邻接图、制造特征体与加工元体的关联关系,对制造特征库进行了构建。接着,对于待加工三维CAD模型,采用凸边分解并经由基面匹配算法从特征库中检索出相应的制造特征,并在此基础上利用CAD模型的几何面信息自动计算出制造特征的定位坐标系和定形参数,同时依据前驱工序模型对定位坐标系和定形参数值进行修正。最后,给定刀具半径和加工余量值,实现加工元体的定位和实例化,并与前驱工序模型做布尔运算,生成三维中间工序模型。在实验部分,以某机加零件为例,对提出方法的有效性进行了实例验证。The construction method mentioned in the title aims to exhibit in the 3D CAPP system how a product part transforms from its blank to its finished product. First, we propose the manufacturing feature and machining element expression method and establish their relationship and manufacturing feature library. Then, we employ the convex decomposition algorithm and the baseface matching algorithm to extract the manufacturing features of the 3D CAD model. We then use the geometrical information of the CAD model to automatically calculate and calibrate their location coordinate system and size parameters and also use the precursor process model to correct them. In this way, given the cutter radius and the machining allowance value, the machining elements are located and instantiated. Finally, the 3D inprocess model is generated by executing the Boolean operation of the machining elements and the precursor process model. The experiments on the complicated product parts verify the effectiveness of the 3D process model construction method.

关 键 词：计算机辅助工艺规划 特征提取 参数化 加工元体 制造特征 工序模型 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]