一种基于配合特征面的三维装配尺寸链自动生成方法

摘要

由于目前尺寸链自动生成存在着人机交互过多，实用性不强，并且主要集中在二维的情况。提出了一种以图论为基础，基于UG的三维空间尺寸链自动生成的方法。通过人机交互对装配体进行自由度的约束，使用UG/OPEN API函数对零件模型进行信息提取；利用图论理论，构建尺寸公差、形位公差和装配邻接表，建立了公差图结构。在此基础上，提出了基于特征面要素的搜索算法，该算法减少了不必要的人机交互，真正意义上实现了三维空间尺寸链的自动生成。通过实例验证了该算法，证明有效。%Because many problems exist in the automatic generation of dimension chain,such as frequent human interaction and low practicality which are mainly concentrated on the two dimensional case,this paper presents a method of three-dimensional space of dimension chain automatic generation based on graph theory and UG. The human-computer interaction is used to constrain the free￣dom of assembly. The UG/OPEN API function is used to extract the information of the part model. And then. the structure of toler￣ance chart of the size,form and position tolerances and assembly adjacent lists are established based on graph theory. On this ba￣sis,it puts forward a search algorithm based on feature elements, which reduces the unnecessary man-machine interaction. This method is only used to real y realize the automatic generation of 3D space dimension chain. It is proved that the algorithm is effecfive by an il ustrative example.