论文部分内容阅读
采用合理的板料形状以及合理地设置拉延筋,能够改善板料在成形中的流动性,从而减少起皱、拉裂等质量缺陷。以某汽车后地板前横梁为例,利用Dynaform坯料尺寸估算模块,对凸模进行逆向展开获得轮廓线,以偏置后的轮廓线的外切矩形确定板料初始形状,并进行成形仿真;在分析成形极限和金属流动方向的基础上,为消除零件的开裂缺陷,对初始板料左、右上角进行切除,获得修正的板料形状。仿真分析结果表明,修正后的板料增加了左、右上角材料的流动性,降低拉深变形的阻力。为减小零件的起皱缺陷,在模具中间部分设置拉延筋,拉延筋的设置降低了中间部分材料的流动性、增加了拉深变形的阻力,使变形趋于平衡,从而提高了零件的成形质量。
The reasonable shape of the sheet metal and the reasonable setting of the drawbead can improve the flowability of the sheet in the forming, thereby reducing the quality defects such as wrinkling and cracking. Taking the front crossbeam of an automobile rear floor as an example, the profile of Dynaform blank is estimated by using the blank size estimation module, the profile is obtained by inversely expanding the punch, the initial shape of the blank is determined by the circumscribed rectangle of the offset profile, and the forming simulation is performed. Based on the analysis of the forming limit and the direction of metal flow, in order to eliminate the cracking of the parts, the left and right upper corners of the initial sheet are cut off to obtain the corrected sheet shape. The simulation results show that the modified sheet increases the fluidity of the materials in the left and right corners and reduces the resistance of drawing deformation. In order to reduce the wrinkling defects of the parts, drawbead is arranged in the middle part of the mold, the setting of the drawbead reduces the fluidity of the material in the middle part, increases the resistance of drawing deformation, balances the deformation and improves the parts Forming quality.