Improving shape accuracy of aluminium alloy surface part in electromagnetically-assisted stamping

The electromagnetically-assisted stamping process with uniform pressure coil was numerically investigated to improve the shape accuracy for a surface part of aluminium alloy. Firstly, two coils were compared to inspect the symmetry of magnetic pressure. An improved coil was chosen to avoid the sidewall distortion of part. Secondly, the discharge voltage showed a crucial influence on the springback control. The springback was significantly reduced by increasing the discharge voltage up to an appropriate level. Thirdly, the effect of the distance between the punch and the die on the springback was inspected. Too large distance would lead to over bending of part. A reasonable distance should be chosen to reduce the springback and improve the shape accuracy of part. Finally, the electromagneticaly-assisted stamping process was experimentally performed, and the desired shape of surface part was obtained.