汽车减震器端盖是一个非规则深矩形盒零件,冲压成形时容易产生筒壁开裂缺陷。通过对其成形特点的分析,提出了开中心工艺孔的两步拉延冲压成形方案,采用DYNAFORM软件对有无中心工艺孔的方案进行了比较。模拟结果显示,开中心工艺孔可以使板料塑性流动更均匀,减薄率减小,避免了拉裂,提高成形质量,与生产实际吻合。 Automotive shock absorber cap is an irregular deep rectangular box parts, stamping forming tube wall cracking prone to defects. Through the analysis of its forming characteristics, a two-step draw-forming scheme with open center hole was proposed. The comparison of the scheme with or without center hole was carried out by DYNAFORM software. The simulation results show that the opening of the center hole can make the plastic sheet flow more uniform and the thinning rate reduced, which can avoid the cracking and improve the forming quality, which is consistent with the actual production.