Experimental and numerical research on magnetic pulse forming of DP600 high-strength steel with driver sheet

Magnetic pulse forming is high velocity forming technology, which requires the workpiece with better conductivity. However, high-strength steel with lower conductivity is difficult to deform by magnetic pulse forming. In this paper, AA1060 sheet was employed to drive DP600 sheet which was used to solve the forming problem of high-strength steel in magnetic pulse forming. Experimental tests and numerical method were used to investigate the deformation characteristic of DP600 sheet. Effects of drive sheet and discharge voltage for DP600 sheet deformation were analyzed. Forming height increases with increasing discharge voltage and optimal thickness of driver sheet is 2mm. Forming profile and thickness of deformed DP600 sheet were provided. Distribution of magnetic field line and magnetic force were presented by numerical simulation. Higher magnetic flux density and magnetic force can be produced by 2mm Al driver sheet. Deformation process, velocity, strain rate, and principal strain were investigated. During the driving process, DP600 sheet was accelerated and got higher velocity about 252m/s with 2mm driver sheet and C=615F/U=3.38kV. Principal strain increases with discharge voltage increasing. And the varied trend can be described by quadratic equation.