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将传统冲压工艺与电磁高能率成形工艺结合,提出一种多向电磁力作用下筒形件渐进复合拉深的成形工艺。通过对该工艺进行数值模拟,发现线圈放电产生磁场的磁力线集中于板料法兰区边缘以及凹模圆角位置,并在这些区域内产生感应电流,该感应电流与线圈中电流相互作用,使得板料法兰区边缘以及凹模圆角处受到均匀的电磁力作用,最终在凹模圆角处产生反胀成形。实验结果表明相比较于传统冲压,板料在一定预拉深高度条件下,线圈放电一次后,板料的拉深高度达到22.8 mm,提高了18.1%;经过4次放电,板料拉深高度达到28 mm,提高了45.1%,说明该工艺能有效提高板料的拉深高度。
Combining the traditional stamping process with the electromagnetic high-energy-rate forming process, a forming process of the progressive composite-drawing process of the tubular parts under the action of multi-directional electromagnetic force is proposed. Through the numerical simulation of the process, it is found that the magnetic flux generated by the coil discharge concentrates on the edge of the flange region of the sheet metal and the fillet angle of the die, and the induced current is generated in these regions. The induced current interacts with the current in the coil so that The edge of the flange of the sheet metal and the fillet of the die are uniformly electromagnetically charged, resulting in anti-bulging forming at the die fillet. The experimental results show that, compared with the traditional stamping, the plate drawing depth increases to 22.8 mm, an increase of 18.1% after the coil is discharged once with a certain pre-drawing height. After 4 times of discharge, the sheet drawing depth Reached 28 mm, an increase of 45.1%, indicating that the process can effectively improve the sheet metal drawing height.