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针对高强度钢板汽车防火墙横梁拉延成形过程存在的拉裂、起皱等问题,提出了一种具有平缓特征的工艺补充面设计方法。应用三维CAD软件对工艺补充部分进行了优化设计,并建立了横梁拉延成形模拟的有限元模型。利用DYNAFORM软件对其拉延过程进行了模拟,分析了板料尺寸、拉延筋的分布、压边力大小、凹模上圆角大小等参数对高强度钢板横梁拉延成形的影响。模拟结果表明,平缓特征的工艺补充面改善了横梁拉延成形时板料成形状态,横梁在拉延成形过程中未出现拉裂、起皱等缺陷,成形后板料最大变薄率在30%以内,满足生产工艺要求。生产实践验证了该拉延工艺的可行性。
Aiming at the problems such as the cracking and wrinkling existing in the drawing process of beam in high-strength steel plate automotive fire wall, a method to design a process complementary surface with smooth features is proposed. Three-dimensional CAD software was used to optimize the process complement and the finite element model of beam drawing forming was established. The drawing process was simulated by DYNAFORM software. The influences of the sheet size, the distribution of drawbead, the blank holder force and the upper fillet size on the draw forming of high strength steel sheet were analyzed. The simulation results show that the flat surface feature of the process to improve the sheet forming process beam forming state, the beam in the drawing process does not appear cracking, wrinkling and other defects, forming the maximum sheet thinning rate of 30% Within, to meet the production process requirements. Production practice verified the feasibility of the drawing process.