【摘要】 回弹是板料冲压成形过程中一种常见、但又很难解决的现象,在U形件尤其是高强度板U形件的成形中回弹更加明显。分析了回弹机理以及U形件的成形特点,提出采用两次弯曲的办法来控制高强度板U形截面纵梁的回弹,利用有限元分析软件DYNAFORM进行了数值模拟,并且对两次弯曲法进行了实验验证。实验结果表明:模拟正确,采用两次弯曲控制纵梁回弹的工艺方法合理。采用此方法使纵梁的回弹控制在零件的公差范围±1.5mm以内,生产出符合图纸要求的零件。更多还原

【Abstract】 Spring-back is a phenomenon that is ordinary but difficult to solve in sheet metal stamping formation,which is much more evident to the U-shape part,especially to the high strength U-part sheet metal stamping formation.The spring-back mechanism and its forming characteristic of U-shaped parts in bending forming were introduced.The method of twice bending was introduced to control spring-back in high strength sheet metal carling.Simulation analysis of this method was done by finite element software named DYNAFORM and experiment was also done to certificate this method’s correctness.Experimental result shows that the simulation analysis is correct and the method of twice bending to control carling’s spring-back is feasible.The carling spring-back is controlled within the range of ±1.5mm of the part tolerance by this method in order to manufacture the parts that can meet the drawing requirement.更多还原