【摘要】 本文提出了一种计算机表达的机械零件模型。它把描述零件的信息分为三个层次：零件的总体描述层、零件的语义层和零件的几何层。在零件的形状建模中，语义层中的形状元素、几何居中的信息及它们之间的联系同时建立。制造活动所需的零件信息通过语义层提供。更多还原

【Abstract】 A mechanical part model represented by computer is proposed in this paper. The information describing part are divided into the overall specification,the semantic information and the geometric information. During part modelling,the shape elements in the semantic information and the geometric information and their links are built at the same time.The part information which are required by manufacturing activities are provided by the semantic information.更多还原