冲模CAD中冲裁件图形数据的生成与存储

PROCESSING AND STORING OF THE GRAPHIC DATA OF STAMPING PARTS IN DIE CAD

利用ＡＵＴＯＬＩＳＰ的实体功能实现对任意形状冲裁件的图形数据的提取。运用极点走向判定法判定轮廓走向（顺时针或逆时针）。根据冲裁件工件图的各轮廓自封闭的特点以单链连接的形式存储图形数据，同时建立构成封闭轮廓的所有实体元素的有向顺序排序表。引入标志位，以便于保存和提取在建表过程中获得的有效数据。

In this paper,AUTOLISP′s entity function is used for obtaining graphic data of stamping part of any shape.The method of judging the orientation (clockwise or anti clockwise) of extremity of a stamping part is used to judge the orientation of the outline of a stamping part.According to the characteristic that every outline closes itself,its graphic data is stored in the form of single chain joint.Then,an ordinal list of entity elements of a closing outline is created.In order to make it more convenient to store and extract those valid data coming from the procedure of creating list,a flag is introduced.