B-Rep参数化设计特征库研究

长期以来 ,对CAD/CAM集成的研究都是以特征技术为核心。大多数传统特征造型系统都具有设计特征库。这些特征库往往被冠以参数化特征库名称 ,但是库中的特征模式却没有提供真正的参数化特征。本文提出了一种真正的参数化设计特征库 ,包括库中特征模式的表示方法及库中特征模式的参数化驱动方法 ,本文称为概念性B Rep(BoundaryRepresentaion)。概念性B Rep是产品模型生成过程与结果表示中所存在的所有实体的表示方法 ,其中包括设计特征库中的基本形状特征模式。设计特征库中的特征模式在被给予具体参数后形成的实体即设计特征引用前的表示形式、加工特征的实体部分、产品模型的整体实体部分 ,均由概念性B Rep表示

Research on Feature Library of B-Rep Parameterized Design

The major traditional systems in feature-shaping have feature-designing libraries, whose feature modes in the libraries have no real parameterized features. This paper puts forward a kind of a real feature library of parameterized design, including the expression method and the parameter driving method of the feature-model in the feature library, called the concept B-Rep( Boundary Representation). After giving concrete parameters, the form of designed feature before quoting, the entity part of process feature, and the whole entity part of the product model, are all presented by concept B-Rep.