汽车覆盖件工艺补充面参数化设计方法

工艺补充面设计的合理性,是保证覆盖件成形质量的重要条件。工艺补充曲面设计和修改的便利性,是提高设计效率的重要途径。本文提出了建立可修改特征参数的截面线类型库,用双向NURBS蒙皮法分片生成工艺补充面的方法和流程,开发了相应的参数化设计模块。在此基础上可以快速实现基于用户控制的工艺补充面的参数化设计和修改。通过对汽车某些零件等实际覆盖件生成工艺补充面的数值仿真验证了可行性。

A parametric method to design addendum surface for automotive panel

The addendum surface design has great effects on the forming quality to automotive panel.The convenience of addendum modeling and modification is an important access to improve design efficiency.The paper presents the method and process of building section curve style database which can be modified by characteristic parameter and generating the addendum surface by bi-direction NURBS skinning.Applying the method presented in this paper,the addendum surface can be generated rapidly according to the shape of section curves,and furthermore,can be modified conveniently by alternate ways.And the relevant parametric design modules are independently developed in Visual C .The feasibility of the technique is proved by the numerical simulation which creates addendum surface of some practical parts successfully.