侧壁卷曲现象存在于带法兰零件的弯曲和拉深工序中,其导致的冲压件尺寸和形状偏差会给零件的后续焊接和装配造成困难。该文通过分析零件变形过程及最终应力分布,解释了侧壁卷曲现象的成因。通过有限元模拟,对比压边力和施加方式对侧壁卷曲现象的影响。结果表明,单纯增加压边力不能减少侧壁卷曲,理想情况是分两步施加压边力,行程开始时施加较小的压边力,在行程结束前很小的行程内施加较大的压边力。提出采用浮动拉延筋工艺可获得理想的压边力模型以减小零件的侧壁卷曲。为验证所提出的工艺,制作相应的模具进行带法兰U形件的成形,结果表明,该新型工艺简单易行,能有效减小侧壁卷曲。 Side-wall curling occurs in the bending and drawing process of flanged parts, which leads to difficulties in the subsequent welding and assembly of the parts due to the size and shape deviation of the parts. In this paper, by analyzing the deformation process and the final stress distribution, the cause of sidewall curling is explained. Through the finite element simulation, the effect of blank holder force and application mode on the curling of the side wall was compared. The results show that simply increasing the blank holder force does not reduce the curl of the side wall. Ideally, the blank holder force is applied in two steps. A small blank holder force is applied at the beginning of the stroke, and a greater pressure is applied during a very short stroke before the stroke end Edge force. It is proposed that the use of floating drawbead process to obtain the ideal blank holder force model to reduce the part of the sidewall curl. In order to validate the proposed process, a corresponding mold was made to form the U-shaped part with flange. The result shows that the new process is simple and easy and can effectively reduce the curling of the side wall.