本文对异构CAD系统之间的用户自定义特征和奇异特征交换进行研究。
UDF and singular feature exchange among heterogeneous CAD systems are researched in this paper.
使用编程的方式对用户自定义特征进行调用，从而开发出基于用户自定义特征的冲裁凸模结构设计模块。
Using programming way to operate the user-defined features, a module for the structural design of blanking punch based on user-defined feature was developed.
利用参数化技术完成了标准件模型的建立，通过用户自定义特征的方法建立开孔特征，并实现了二者的关联。
The models of each standard part could be created based on parametric method, and the pocket feature related to the standard part could be created with UDF (user defined feature) method.
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