基于AutoForm的轮毂外包板拉延筋设置及板料优化

轮毂外包板为一弧状拉延件，工件拉延的局部起皱、破裂和拉深不足均源自流动不均匀。利用AutoForm软件模拟拉延过程，比较分段、整段与整圈3种结构拉延筋，发现整圈拉延筋效果最好，最大增厚率从3．32%降到1．18%，起皱消除。按流动均匀原则优化板坯形状，将板坯直角边改为圆弧，形成扇形板坯。研究结果表明，整圈拉延筋+扇形板坯设计，拉延最大增厚率与减薄率分别为0．56%与19．3%，缺陷消除，并得到合格产品。

Design of drawbeads and optimization of blank for hub hood fender based on Autoform

The shape of the hub hood fender automobile panel is arc, so it is easy to wrinkle, rupture and form inadequately during its forming because of the non-uniformity material flow. The drawing process was numerically simulated by Autoform software, and the best effect of the deformation was gained through the closed circuit drawbead by comparing three different drawbeads design, namely sections, open circuit and closed circuit. Therefore, the maximum thickening rate decreased from 3. 32% to 1. 18%, and the wrinkle disappeared on the panel. Furthermore, the blank shape was optimized according to the material flow rule, namely, all right angle sides were modified by circular arc to form fan-shaped blank. The results show that with the design of closed circuit drawbead and fan-shaped blank, the maxi-mum thickening rate and thinning rate is 0. 56% and 19. 3% respectively, and the qualified products are obtained without defection.