Why do stamping parts turn over and twist?

In the progressive die, the shape of the stamping part is formed by punching the remaining materials around the stamping part. The main reason for the turnover and distortion of stamping parts is the influence of blanking force. During blanking, due to the existence of blanking gap, the material is stretched on one side of the female die (the material warps upward) and compressed on the side of the male die. When the unloading plate is used, the unloading plate is used to compress the material to prevent the material on the die side from warping upward. At this time, the stress condition of the material changes accordingly.


With the increase of the pressing force of the discharge plate, the material near the punch side is stretched (the compressive force tends to decrease), while the material on the die surface is compressed (the tensile force tends to decrease). The turnover of stamping parts is caused by the material on the die surface being stretched. Therefore, during blanking, pressing and compressing the material is the key to prevent the blanking parts from turning and twisting.

Causes and Countermeasures of turnover and distortion of stamping parts during bending.


1. It is caused by the rough edge of the punched part during blanking. It is necessary to study the punching cutting edge and check whether the blanking clearance is reasonable.


2 during blanking, the blanking parts have been turned over, distorted and deformed, resulting in poor forming after bending, which needs to be solved from the blanking station.


3. It is caused by the instability of stamping parts during bending. Mainly for U-shaped and V-shaped bending. The key to solve this problem is to guide the stamping part before bending, guide the stamping part during bending, and press the material during bending to prevent the stamping part from sliding during bending.