In daily production, there will be situations where the punching size is too large or small (it may exceed the specification requirements) and the size of the punch is quite different, except for the design size, processing accuracy and punching of the forming convex and concave mold. In addition to factors such as gaps, the following considerations should also be taken to solve them.
(1). When the punching edge is worn, the tensile stress on the material increases, and the tendency of the stamping parts to turn over and twist increases. When turning over, the size of the punching hole will become smaller.
(2). The strong pressure on the material causes plastic deformation of the material, which will cause the punching size to become larger. When the strong pressure is reduced, the punching size will become smaller.
(3). The shape of the edge of the punch edge. If the end is trimmed with a slope or arc, the punching force will be slowed down, and the punching part will not be easily turned or twisted. Therefore, the punching size will become larger. When the end of the punch is flat (no bevel or arc), the punching size will be relatively small.
In the specific production practice, specific analysis should be made for specific problems, so as to find out the methods to solve the problems.
