中文摘要：

基于NX平台，开发了级进模连续展开系统，主要解决级进模条料设计的中间构形设计问题。系统针对不同的钣金成形情况，提供了几何展开与成形展开两种展开方式，考虑了中性层偏移问题。对于旋转变形区域，开发的几何展开功能能够实现按角度展开；对于复杂的变形区域，采用成形展开方式，将变形区展开到参考面上，并将与变形区相关联的区域跟随变形区的展开作随动旋转。其中，成形展开基于有限元逆算法，具有完整的前后处理功能。开发的展开功能，实现了条料中间构形的连续逆向展开，解决了级进模设计中的一个关键难题，突破了现有展开模块仅能实现完全展开的局限性。以一级进模设计实例，演示了开发的功能。

英文摘要：

This progressive die continuous unfold system was developed on Siemens/NX platform, mainly to resolve the design of intermediate shapes when designing the progressive die strip layout. Considering different sheet metal forming conditions, this system provided two unfold methods, geometry unfold and forming unfold. At thesame time, the system took the neutral layer offset into consideratiorL For the rotation deformation area, the developed geometry unfold function could realize the unfolding by angel. For the complex deform area, forming unfold function could unfold deform area to the reference plane. Then the area con- necting with the deform area would be rotated with the unfolding of the deform area. In this system, forming unfold was based on inverse approach of FEM, and had the whole functions of pre-process and post-process. The developed unfold function realized continuous reverse unfolding of intermediate shapes of die layout. This system resolved a key problem of progressive die design, and broke through the limitation of existing unfold modules which could only realize fully unfold. Finally, an example of progressive die design was presented to demonstrate the developed function.