面向产品建模的新一代实体造型技术研究

针对ＣＩＭ和并行工程的产品建模需要,探讨了实体造型的两种新途径。一种是用精确的ＮＵＲＢＳ曲面构造基本体素,实现曲面拼合运算；另一种是采用特征技术,将子形素贴合在父形素的连接面上,实现尺寸驱动的参数化设计,部分回避传统的拼合运算。

STUDY OF THE SOLID MODELING TECHNIQUES ADAPTIVE TO PRODUCT MODELING

Solid modeling techniques with precise NURBS surfaces and form features are studied to meet the needs of product modeling in a CIM and concurrent engineering environment.Specif-ics of realizing the Boolean operation of sculptured solids as well as the designing-with-feature processes are outlined.The fonner carries out the set operation of two faee loops on the paramet-er planes of NURBS surfaces and results in a trimmed surface structure,while the latter explicitly locates a child feature on thejoint face of parent feature,bypassing the traditional tedious set operations.Both approaches are useful and should be merged into a parametric,variational and feature-based solid modeler.