Why does the punching size of precision stamping parts not meet the standard?

1. Burrs generated during blanking. Study the punching edge, and pay attention to check whether the punching gap is reasonable. stamping parts are unstable when bent. Mainly used for U-shaped and V-shaped bending. The focus of solving this problem is to guide the stamping part before bending, guide the stamping part during the bending process, and press the material during the bending process to prevent the stamping part from sliding during the bending process. Punch burrs produced during blanking. Study the punching edge, and pay attention to check whether the punching gap is reasonable.

2. When the cutting edge is worn, the tensile stress of the material increases, and the stamped parts tend to flip and twist. When flipping occurs, the punch size becomes smaller. The strong pressure of the material will plastically deform the material, resulting in an increase in the size of the punched hole. When the strong pressure is reduced, the punching size becomes smaller.

3. The shape of the punch edge. If the end is repaired with a bevel or arc, due to the relief of the punching force, the punching piece is prone to turning over and smearing, so the punching size will be larger. When the punch end is flat (no bevels or arcs), the punch size is relatively small. In the specific operation practice, specific research should be carried out on specific problems, and the methods and countermeasures to solve the problems should be found out.

Well, I hope the above content can help readers.