三维工艺模型标注尺寸构造方法研究  

Research on Dimensional Construction Method of 3D Process Model

作　　者：侯增选[1] 李林 黄磊[1] 张焱 HOU Zengxuan;LI Lin;HUANG Lei;ZHANG Yan(School of Mechanical Engineering,Dalian University of Technology,Dalian Liaoning 116024,China)

机构地区：[1]大连理工大学机械工程学院,辽宁大连116024

出　　处：《图学学报》2018年第5期843-848,共6页Journal of Graphics

摘　　要：根据工艺和拓扑相关表面(TTRS)理论识别三维工艺模型中全部面的特征,获得零件的TTRS和相应最小几何基准元素(MGDE)的几何与拓扑信息,提取工艺模型标注元素。根据MGDE与基准的相对位置对工艺模型标注元素进行分类用于构造标注尺寸。标注元素存在冗余,针对3种冗余情况提出了相应的冗余标注元素消除规则,并依据规则实现了冗余消除。对于6种尺寸标注类型,给出了其权值的计算方法,并以此确定尺寸标注次序。针对生成的标注尺寸中可能存在冗余的情况,运用图论方法消除冗余标注尺寸,并给出了冗余标注尺寸消除算法流程图。构建了完整的尺寸标注集,实现了工艺模型三维标注尺寸的构造。基于UG/Open Grip开发了三维标注尺寸构造与显示模块,实现了上述算法。According to the TTRS theory,the characteristics of all surfaces in the 3D process model are identified,TTRS of the parts and the geometric and topological information of the corresponding MGDE are obtained,and the process model dimension elements are extracted.According to the relative position of the data,the dimension elements are classified to construct the annotation dimension.Owing to the existence of the redundancies in the elements,the corresponding rules of eliminating the redundant dimension elements are proposed for the three kinds of redundancies,and eventually the elimination is accomplished based on the rules.For the six dimension types,the method for calculating their weights is porposed,and accordingly the dimension order is determined.For the case that there may be redundancy in the generated dimension,the graph theory method is adopted to eliminate the redundant dimensions,and to provide the flow chart of the algorithm for eliminating redundant dimensions.A complete set of dimension is constructed so that the dimensional construction of 3D process model is accomplished.Based on UG/Open Grip,the 3D dimension construction and display module is developed to implement the above algorithm.

关 键 词：TTRS 三维标注 标注元素 标注尺寸 冗余消除 图论 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]