产品反求CAD建模工程化技术研究

研究了模型边界处理方法及复杂曲面局部特征设计方法，总结了CAD模型边界的三种获取方法，提出了基于零件视图投影原理，从2D图纸合成3D边界的技术方案，提出了一种以特征点为导向、基于多视图连续变换原理的3D边界和初始曲面模型匹配方法；提出了边界特征和内部特征曲面设计方法，给出了复杂形状产品反求CAD建模应用实例。

Engineering Technology on Product Reverse Engineering(CAD) Modeling

A design methodology dealing with boundary and local features on the surface model is researched mainly. Three methods to obtain the CAD model's boundary are summarized, a technique to generate 3D boundary from 2D drawing is given based on drawing projection principles. Moreover, based on the characteristic points and sequence transform theory of multi-views, the matching technology between the 3D boundary and initial surface model is proposed. Furthermore, aiming at the engineering needs, a modeling method for boundary features and inner feature surfaces is also presented. And as a result, some reverse engineering CAD models of products with complex surfaces are built with the methodologies.