车门成形后凹陷成因分析和应对措施  

Analysis on causes of partial depression after door shaping and countermeasures

作　　者：周驰[1] 周旭辉[1] 张赛军[1] 胡芳鸽 麦广辉 

机构地区：[1]华南理工大学机械与汽车工程学院,广东广州510641 [2]广汽本田汽车有限公司机械模具科,广东广州510700

出　　处：《模具工业》2011年第12期18-20,共3页Die & Mould Industry

基　　金：国家自然科学基金(50805050);广东省自然科学基金博士启动项目(9451064101002840);华南理工大学中央高校基本科研业务费专项资金(2009ZM0293)

摘　　要：局部凹陷是轿车外覆盖件成形中的一种典型问题,其成因和控制方法一直是困扰汽车行业的一个难题。通过有限元模拟,分析了成形中的应力应变的演变状况,并据此提出了车门成形后在把手部位出现凹陷的原因和应对措施。由于受到零件形状的影响,在成形末端材料流动不均匀,而导致了最终应力分布的不均匀。在卸载阶段,应力的释放引起了车门把手周围的局部凹陷。针对上述成因,改变零件形状、改变补充面形状或设计拉延筋、对局部施加强压等方法均有助于改善凹陷情况。Partial depression is a typical problem in the forming of automobile panel and its causes and control method are a difficult problem in auto industry.The changes of stress-strain in forming process was analyzed by finite element simulation and based on the result,the cause of door handle deformation after door shaping and countermeasures were proposed.Affected by the part shape,the flow of material is not even at the forming end,which leads to uneven stress distribution.At the unloading stage,the release of stress causes partial depression of the handle.According to the analysis,the problem can be im proved by changing the shape of part and addendum,the design of draw-bead and by im posing local pressure.

关 键 词：汽车覆盖件 冲压 局部凹陷 应力分布 

分 类 号：TG385.4[金属学及工艺—金属压力加工]