一种基于三角面片法线方向设计复杂异形模型自由曲面分型面的方法  

A Method of Designing Free-Form Parting Surface of Complex Special-Shaped Model Based on the Normal Direction of Triangular Patch

作　　者：董香平 樊庆文[1] 蒋汶莙 周明聪 熊良胤 裴宏亮 DONG Xiangping;FAN Qingwen;JIANG Wenjun;ZHOU Mingcong;XIONG Liangyin;PEI Hongliang(School of Mechanical Engineering,Sichuan University,Chengdu 610065,China;Institute of System Engineering,China Academy of Engineering Physics,Mianyang 621900,China)

机构地区：[1]四川大学机械工程学院,四川成都610065 [2]中国工程物理研究院总体工程研究所,四川绵阳621900

出　　处：《机械》2022年第5期1-6,40,共7页Machinery

基　　金：四川省苗子工程项目(2020JDRC0029);四川省重点研发项目(22ZDYF2983)。

摘　　要：提出一种基于复杂异形体模型三角面片法线方向设计异形分型面的方法,利用数字化三维模型构建三角面片模型的半边数据结构;计算所有三角面片法线方向,确定最佳拔模方向;根据三角面片法线方向与最佳拔模方向的空间关系,将各三角面片聚类并确定异形分型线,沿最佳拔模方向进行平移,得到复杂模型的异形分型模具。以人体胸骨模型的模具设计为例,计算人体胸骨模型的最佳拔模方向,设计异形分型线,获得胸骨模型的异形分型模具,并将该方法应用于人体其他器官模型。实验证明,该方法适应性强,能够快速确定异形分型面,具有重要的实用价值。A method of designing a special-shaped parting surface based on the normal direction of the triangular patch of a complex special-shaped model is proposed.The digital three-dimensional model is used to construct the half-edge data structure of the triangular patch model.The normal direction of all the triangular faces is calculated and the best draft is determined.According to the spatial relationship between the normal direction of the triangular patch and the best draft direction,we clustered the triangular patches and determined the special-shaped parting line,and then translated along the best draft direction to obtain the special-shaped part of the complex model mold.Taking the mold design of the human sternum model as an example,we calculated the best draft direction of the human sternum model,designed the special-shaped fractal line,obtained the special-shaped fractal mold of the sternum model,and applied this method to other human organ models.Experiments have proved that the method has strong adaptability.It can quickly determine the special-shaped fractal surface,which is of important value in practice.

关 键 词：复杂异形模型 三角面片 分型线 最佳拔模方向 

分 类 号：TG76[金属学及工艺—刀具与模具]