When the material thickness is 10mm, according to the calculation method of punching force, the shear strength of the contour line circumference is X 10X, and the result is a great calculation result. Forming, bending, larger value. At this time, large tonnage stamping equipment is needed, and the stamping cost is expensive. Moreover, the material of 10mm is very heavy, and it is inconvenient to feed. There is also the ability of the punch, the occurrence point will be several millimeters, and the thick material will hurt the punch. Moreover, the blanking section of thick material is rough and unsightly, and the mold is also expensive.