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选择室温下塑性较差的AZ31B薄板为研究对象,建立了多点弯曲成形的有限元模型,提出韧性损伤、能量耗散、应力分布和形状误差四项指标,以评价不同弹性垫厚度对多点弯曲成形性能的影响。结果表明:弹性垫的使用,将冲头单元与弹性垫的点-面接触提升为弹性垫与板料间的面-面接触;弹性垫缓冲并较均匀的释放来自压机的冲击性能量;合理厚度的弹性垫能够提高AZ31B薄板的成形性能,使上述四项指标的波动达到最小。
Select the poor plasticity of AZ31B sheet at room temperature as the research object, established a multi-point bending forming finite element model, proposed ductile damage, energy dissipation, stress distribution and shape error of the four indicators to evaluate the different elastic pad thickness of the multi-point Effect of Bending Formability. The results show that: the use of the elastic pad raises the point-plane contact of the punch unit and the elastic pad to the surface-to-surface contact between the elastic pad and the sheet; the elastic pad cushions and evenly releases the impact energy from the press; Reasonable thickness of the elastic pad can improve the formability of AZ31B sheet, so that the above four indicators of fluctuations to a minimum.