高强度钢板梁类件拉延工艺补充及成形参数优化
Drawing Process Supplement and Forming Parameter Optimization on High-strength Steel Beams
王梦寒， 刘 文， 张 旭
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作者单位：（重庆大学 材料科学与工程学院，重庆 400030）
中文关键字：高强度板； 防火墙横梁； 工艺参数； 数值模拟
英文关键字：high strength steel plate; firewall crossbeam; process parameters; numerical simulation
中文摘要：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。
英文摘要：In view of the automobile firewall crossbeam of high strength steel plate having some defects， such as crack, wrinkle and so on in drawing process, a design method of process complementary flat surface was proposed. The supplement surface was optimized by 3-D CAD software, and the finite element model for drawing simulation of the crossbeam was established. The drawing process was simulated using DYNAFORM software and the influences of the sheet size, the distribution of drawbead, blank holder force, the die's round corner and other parameters on the drawing process were analyzed. The simulation results show that the flat complementary surface improves the sheet metal's formability in the sheet metal drawing process, the beam in forming process has no rip, wrinkle, the maximum thinning ratio after forming is within 30%, which meets the production requirements. The production practice demonstrates the feasibility of the drawing process.