Hehe, just think about the action decomposition in the stamping process. In fact, here you have to distinguish between the wear of the punch and the die in two cases: one is the passivation of the tough mouth, and the other is the change of the diameter of the tough mouth (taking the circle as an example, other shapes are the same). In one case, when the female die and the male die are clamped and sheared, the stress on the tough mouth is almost the same. If you produce more, you will find that the tough mouth is not a sharp corner but an R angle. These two situations are the change of the inner wall of the female die and the outer circumference diameter of the male die. What happened in one cycle of the shearing process? The waste falls straight from the female die, which means that there is only a friction between the waste and the inner wall of female die, but what about the male mold? It needs to pass through the substrate once and then exit the substrate, which is the friction between the substrate and the circumference of the punch twice. Therefore, if carefully analyzed and observed, it is easy to see that the wear degree of the punch is much greater than that of the die.

This basic principle can be changed without going backwards.