Some key technology in assem bly design is solved as follows: definition of basic class component parts, esta blishment of assembly modeling, dimension chain of geometry constraint and assig nment of components in assembly modeling.

• 解决了装配设计中的几个关键问题：装配模型中基类零件的定义、装配模 型的建立、装配图中零部件几何约束尺寸链、装配图中零部件位置确定。