机械CAD的图形处理技术  

CAD Mechanical Graphs Operation Technique

作　　者：吴中奇[1] 陆国栋[1] 陈向平[1] 

机构地区：[1]浙江大学

出　　处：《机械工业自动化》1992年第1期6-10,共5页

摘　　要：介绍适用于机械CAD的图形处理技术,目的是用计算机进行平面构形及三维实体造型,生成机械产品的两维、三维零件图和装配图。介绍了三种生成两维图形的方法(图形描述、几何作图、集合运算)。采用边界表示法表示三维物体,提出凸多边形差分割、凸包树差分割原理和算法,用统一思路处理三维零件图和装配图,既提高了运算速度、处理功能,又使结构紧凑.This article is to introduce the tcchnigue for CAD mechanical graph operation, aiming at employing computer to perform planar drawing and 3-D solid modelling, producing 2-D and 3-D part drawing and assembly drawing for machinery products. Three 2-D graph generating methods (graph description. geometric drafting and set operation) are introduced. BReps is adopted to show 3-D solid bodies, and the theories and algorithm of the convexpolygon subdivision and convex hull tree subdivision are put forward to operate 3-D part and assembly drawing under unified train of thoughts, thus rot only prorrotirg the speed of algorithm and operation function, but also making the structure compact.

关 键 词：图形处理技术 三维立体造型 

分 类 号：TH122[机械工程—机械设计及理论]