Several aspects to be considered in daily production

In addition to the design size, machining accuracy and blanking clearance of the forming punch and die, the following factors are also considered:

(1) when the cutting edge is worn, the tensile stress of the material increases, and the tendency of turning over and twisting of the stamping parts increases. When turning over occurs, the punching size tends to be smaller.

(2) the strong pressure on the material will cause plastic deformation of the material, which will lead to the increase of punching size. When the pressure is reduced, the punching size will be smaller.

(3) the shape of the edge end of the punch. If a bevel or arc is made at the end, the punching size will be larger because the punching force is slowed down and the punching parts are not easy to turn over and twist. When the end of the punch is flat (no bevel or arc), the punch size will be smaller.