The effect of blanking clearances on side profiles of blanked parts in micro blanking
摘要
Similar to conventional blanking, there are some characteristics, such as rollover, burnish, and fracture on the sides of micro blanked parts, and rollover height and fracture height vary with the blanking clearance. This paper attempts to reveal the effect of blanking clearance on the rollover height. An uncoupled ductile fracture criterion is used to describe the effect of the blanking clearance on the fracture height. The experimental and simulation results show that the increase in hydrostatic stress gradient on the foil around the die edge results in an increase in rollover height. The coefficients of the uncoupled ductile fracture criterion are determined by the method of inverse solution and data fitting. The criterion is evaluated by mean-square error to ensure its validity. This analysis method has been verified by micro brass blanked part.