基于变压边力的汽车翼子板冷冲压成形模拟分析

针对汽车零件冷冲压成形过程中易出现的起皱、回弹以及拉延不足等质量问题,以某品牌汽车的翼子板为例对其进行了变压边力成形分析.首先,以零件成形极限为评价目标,通过分析整体恒压边力成形确定零件的临界压边力值; 其次,利用整体变压边力成形方法分析9种常用变压边力加载形式的优劣,以此确定最佳的变压边力加载形式; 最后,根据拉延后板料的应变分布给出分区变压边力成形的方法,并对汽车翼子板进行分区变压边力仿真成形分析.仿真分析表明:整体变压边力成形方法能够有效降低零件的最大减薄率、最大增厚率和最大回弹量以及改善零件的成形极限; 分区变压边力成形方法不仅能够有效提升零件的成形极限,而且还可减少最大减薄率和有效控制回弹量.该研究结果可为选取汽车零件的冲压成形工艺提供参考.

Simulation analysis of cold stamping forming of automobile fender based on variable blank holder force

Aiming at the quality problems such as wrinkling, springback and insufficient drawing that are easy to occur in the cold stamping and forming process of automotive parts, the variable edge force forming analysis was carried out by taking the fenders of a certain brand automobile as an example.Firstly, taking the forming limit of the part as the evaluation goal, the critical pressing force value of the part is determined by analyzing the overall constant pressure edge force forming.Secondly, the advantages and disadvantages of nine commonly used variable pressure edge force loading forms are analyzed by the overall variable pressure edge force forming method, accordingly determine the best variable pressure edge force loading form.Finally, according to the strain distribution of the drawn sheet, the forming method of zonal variable edge force is given, and the simulation forming analysis of the partition variable edge force of the automobile fenders was carried out.The simulation analysis shows that the integral variable edge force forming can effectively reduce the maximum thinning rate, maximum thickening rate and maximum springback of parts, and improve the forming limit of parts.The zonal variable edge force forming method not only effectively increases the forming limit of the part, but also reduces the maximum downgauging rate and controls the amount of springback.The results of this study can provide a reference for the selection of stamping and forming processes of automotive parts.