The effect of variable blank-holder forces on formability of ractangle box deep drawing

The predominant failure mode in stamping of sheet metal parts are wrinkling and fracture , in general, these defects may be eliminated by appropriate manipulated the blank holder forces. In this paper, the evaluation function of the formability of rectangle-box deep drawing was established, the effects of variable blank holder forces (spatially) on the formability of rectangular box deep drawing process was investigated based on the numerical simulation of sheet metal forming, the control strategy of the Variable blank-holder forces in rectangular box has been developed to improve the formability and to increase the attainable pan height.