基于变异特征的零件建模系统

A Variant-feature-based Modeling System for Mechanical Parts

提出了变异特征的概念 ,分析了特征在加工中的几何变异、属性变异、特征增生以及结构特点等问题。讨论了变异特征数据结构、具体定义及特征建模系统原理 ,最后给出了具体实例验证 ,成功地解决了像 T型槽、燕尾槽、盲坑等加工工艺性复杂特征面向制造的建模问题 ,并在 CAPP中自动确定出这些特征的加工工序及装夹方案 。

In order to solve the transfer and transit of data in CAD/CAPP/CAM and improve the efficiency and quality of design, we present the conception of feature variation and analyzed the geometry variation, attribute variation, feature creation and structure character. We also discussed the data structure of variant features and its definition in detail and the principle of feature-based modeling system. Finally an example was given. Using variant-feature-based modeling system, the problems of features with complex process planning such as T-slot, dovetail-groove and pocket were solved successfully. CAPP can obtain these features' process and fixture planning automatically. All of these validate that the variant feature has wider and stronger adaptability than parametric feature.