1. Feeding method of progressive die: 1. Feeding on both sides: the feeding belt of progressive die is stable as a whole

2. Single side strip: the progressive die is used when there is only a single side strip level, and when the single side strip can ensure the smooth feeding of the strip

3. Intermediate material carrying: used when there is no other material carrying level for the product and the material feeding can be ensured smoothly

4. Strip forming with continuous shear tape: it can be used when there are bends on the four sides of the product and there is no flat strip