Numerical Simulation of Deep Drawing of Square Box Part Base on Controlling Blank Holder Force

The wrinkling and fracturing of sheet deep drawing deforming are major deforming defects of deep drawing part.It is an effective way to control sheet plastic flow through applying blank holder force on blank holder.Applying finite element simulation method,under single-piece blank holder mode,different constant blank holder force and variable blank holder force,the material flow situations of square box part deep drawing were simulated.The simulation results show under variable blank holder force,the result of square box part deep drawing deforming is better than that of under constant blank holder force.It is an effective way to control sheet plastic flow through acting variable blank holder force on blank holder.It can inhibit wrinkle and delay fracturing of sheet and improve the performance of square box part deep drawing.