This paper takes advantage of numeric simulation technology to investigate the weld - line movement and formability of twb with the same property and different thickness , analyzes the weld - line movement in three different drawing ways with the same drawing depth , and shows the normal rule of weld - line movement in different drawing ways , and the relationship between the weld - line movement and formability of twb of different thickness 摘要本文利用数值模拟技术对相同材质差厚拼焊板的冲压成形性和焊缝移动进行研究，分析了相同拉延深度、不同拉延方式下焊缝移动情况，揭示了不同拉延方式下焊缝移动的一般规律和焊缝移动量与差厚拼焊板成形性之间的关系。
This paper referred to the massive domestic and foreign technical material , elaborated in the sheet forming value simulation theory essential technology in detail , points out when analysis sheet forming question should use the big distortion ball plasticity fem and introduce the application characteristic and the function summarizes of the sheet forming simulation software dynaform . secondly , analyzed the cover forming characteristic , simultaneously introduced the influence cover forming factor in detail : such as ramming direction , the craft addendum surface and the material pressing surface , the radius of convex - concave mold , draw bead , pressure strength , blank size and craft margin and so on . and simulates many typical automobiles cover panel with software : such lateral board , back taillight pedestal and storage cover 其次,分析了覆盖件成形的特点和要求,同时详细介绍了影响覆盖件成形的因素如冲压方向、工艺补充面和压料面、凸凹模圆角、拉延筋、压边力、坯料尺寸和工艺切口等,并用数值模拟软件对多个典型的汽车覆盖件汽车后侧围板、后灯座以及轿车后备箱盖的冲压成形情况进行模拟,用模拟结果优化拉延工艺方案,比较了内覆盖件和外覆盖件在成形特点和要求的一些异同点,以及常见的起皱、拉裂和回弹、成形不足等缺陷的产生机理和相应对策,重点介绍工艺补充面和压料面的设计及优化方法,因为拉延是冲压工艺的关键工序,而工艺补充面和压料面的设计是拉延工序的关键,对消除缺陷至关重要。
In this paper , by using non - linear finite element software , ansys / ls - dyna , simulate a forming of auto fall to ground skeleton part , get the contour of the semi - finished product , forecast the change of the blank thickness and the probable wrinkling , cracking , and from the simulation of the spring - back , obtain the spring - back tendency . so , get technology parameters , which are inextricable to forming production . all these will pose great significant to production in theory and reality 本文运用非线性有限元软件ansys ls - dyna对汽车落地骨架零件进行了冲压成形的数值模拟，得出了毛坯外形，预测了成形过程中板料壁厚变化和可能出现的起皱、破裂现象，通过回弹模拟，预测了回弹趋势，获得了该类零件成形所需要的工艺参数，对实际生产具有一定的指导作用。
Punch forming of sheet is used widely in the industries of auto , electric appliance and aviation , etc . the numerical simulation technology of sheet forming has been developed rapidly since 1970s . especially with the rapid development of computer , the numerical simulation technology of sheet forming has tended towards the practical stage and changed the traditional design of sheet punch forming 板料冲压成形广泛应用在汽车、电器、航空航天等工业部门， 20世纪70年代以来，板料成形数值模拟技术得到了迅速发展，特别是随着计算机技术的飞速发展，板料成形数值模拟逐渐走向实用化阶段，改变了传统的板料冲压成形的设计过程。
