正多边形盒零件冲压成形凸缘变形区的应力分布计算

首先给出正多边形盒零件凸缘变形区的应力分布式 ,接着分析了凸缘变形区的应力变化规律 ,并以0Cr18Ni9板材和方盒零件为算例给出了凸缘变形区的应力分布曲线。正多边形盒零件凸缘变形区圆角部分的拉深变形是发生皱曲和破裂之源并向直边部分转移材料 ,使直边部分松弛乃至皱曲。因此 ,对于皱曲通常选择设置压边装置 (压边圈、拉深筋等 )来解决。对于破裂通常选择增大侧壁间圆角半径或多次拉深来解决。正多边形盒零件冲压成形最好采用分区 (分块 )变压边力拉深或分区 (分块 )恒压边力拉深

The stress distribution calculation of the flange defermation region of regular polygon box parts by stamping forming

The stress distribution equations of flange deformation region of regular polygon box parts are given firstly in this paper.The stress variable laws of flange deformation region are also analyzed.And the stainless steel sheet 0Cr18Ni9 and the square box parts are regarded as a calculation examples,the stress distribution curves of flange deformation region are constructed.The deep-drawing deformation of flange deformation region corner on regular polygon box parts is source(cause) of wrinkle and fracture and transfer material to the sides which are relaxed up to wrinkle(result).Hence,wrinkle is prevented by usually selecting the blank holder,fracture is obviated by usually selecting larger profile radius between walls or by multi-deep-drawing. The partition variable blank holder forces deep-drawing or the partition constant blank holder forces deep-drawing would be better processes for regular polygon box parts stamping.