There are three commonly used methods:\x0d\1. Multiple trimming,\x0d\2. Ordinary mold, high-pressure stamping\x0d\3. Fine blanking die, hydraulic fine blanking machine\x0d \The above three methods can achieve 95% bright band, or even 99% bright band, but they cannot achieve 100% bright band. There are slight defects on the sag surface and burr surface, but they have no impact on the use at all, or Use other methods to remove defects.