The formation of the defective dimple and its influencing factors in multi-point forming (MPF) process of sheet metal were analysed mechanically and it was indicated that dimpling defect could be eliminated evidently with elastic cushion.

• 摘要对多点成形中压痕缺陷的形成及影响因素进行了力学分析，指出弹性垫技术可以明显地消除压痕缺陷。