随着冲裁间隙自小到大不断增加,落料和冲孔的回弹会改变方向。这就产生了以下两个问题: 1.凹模和凸模刃口尺寸的磨损,能造成间隙扩大,如果这样扩大的间隙足以使回弹改变方向,则一个例如圆形的落料件,开始时尺寸大于凹模孔(正回弹),而后来由于刃口磨损产生反回弹,落料件的尺寸小于 As blanking clearances increase from small to large, the blanking and punching rebounds change direction. This creates the following two problems: 1. Abrasion of the die and punch edge dimensions can cause the gap to widen, and if such an enlarged gap is sufficient to redirect the rebound, then a, for example, round blanking piece begins When the size is larger than the die hole (positive rebound), and later due to the edge wear anti rebound, blanking pieces of less than the size