本文提出了一种适用于微机的、带局部成形的弯曲件图形的描述和输入方法。此法把弯曲件看成是由平面片和弯曲区构成的弯曲树。先用二维方法输入带有弯曲信息的平面片,再由软件将各面片逐级变换到空间位置上去并生成弯曲区,同时算出展开料。此法简单、快速、实用,已成功地应用于我校模具研究室研制的冲裁弯曲成形级进模CAD/CAM软件中。 In this paper, a method of describing and inputting the shape of a curved part with a local shape suitable for a microcomputer is presented. This method treats the flexure as a curved tree made up of flat slices and curved sections. First with two-dimensional method of input with a flat sheet of bending information, and then by the software step by step to transform the various facets to the position of the space and generate bending zone, while calculating the expansion expected. This method is simple, rapid and practical, and has been successfully applied to the die-forming CAD / CAM software for punching and bending forming developed by our mold research institute.