电磁力作用下平板变形的实验研究

Experimental Research on Sheet Metal Deformation under the Electromagnetic Force

通过平板件的电磁无底凹模成形、有底凹模成形的实验研究 ,发现不同形式的压边圈可以导致不同的工件变形高度。有底凹模成形时 ,在设备能量足以使工件变形达到凹模底部的情况下 ,工件的最大变形高度小于凹模深度 ,并且电压越大 ,工件的变形高度越小 ,而且在较大电压的情况下 ,工件底部还会出现反向变形。对实验现象进行了分析 ,认为不同形式的压边圈 ,板料所受径向拉深力不同 ,导致不同的工件变形高度 ;板料受撞击产生的反向运动是导致工件最大变形高度小于凹模深度的主要原因。

By the experimental research of sheet me tal electromagnetic free forming and die forming, it is found that different hold-down ring will lead to different workpiece deformation height. For the die forming, when the energy of the forming equipment is high enough for the workpiece to deform to the bottom of the die, the maximal deformation height of the workpiece is lower than the depth of the die, and the deformation height of the workpiece becomes lower when the forming voltage is higher, and also when the forming voltage is high enough, the bottom of the workpiece will deform toward the opposite direction. The experimental phenomenon is analyzed in this paper, and it is deemed that different hold-down ring will lead to different radical drawing force, thus lead to different workpiece deformation height, and it is the movement toward the opposite direction caused by the sheet metal impact with the die that leads to the result that the highest deformation height of the workpiece is lower than the depth of the die. The deformation process of the sheet metal under the electromagnetic force is also analyzed in this paper.