Why do metal stamping parts appear to be twisted?

The stamping part is formed in the progressive die by punching the remaining material around the stamping part to form the shape of the stamping part. The main reason for the turning and distortion of the punching parts is the influence of the punching force. When punching, due to the existence of the punching gap, the material is stretched on one side of the die (the material is warped upwards) and compressed on the side of the punch. When using the unloading plate, the unloading plate is used to compress the material to prevent the material on the die side from warping upwards. At this time, the force of the material changes accordingly. As the discharge plate increases its pressing force, the material on the punch side is stretched (compression force tends to decrease), while the material on the concave die surface is compressed (tension force tends to decrease). The overturning of the stamping part is caused by the stretching of the material on the die surface. Therefore, when punching, pressing and compressing the material is the key point to prevent the punching from turning over and twisting.

The reasons and countermeasures of turning over and twisting of stamping parts during bending: 1 It is caused by the burrs of stamping parts produced during blanking. Need to study the cutting edge, and pay attention to check whether the blanking gap is reasonable. 2 The turning, distortion and deformation of the punched parts have occurred during the blanking process, resulting in poor forming after bending, which needs to be solved from the blanking and unloading station. 3 It is caused by the instability of stamping parts during bending. Mainly for U-shaped and V-shaped bending. To deal with this problem, guiding the stamping parts before bending, guiding during the bending process, and pressing the material during the bending process to prevent the stamping parts from slipping during bending are the key points to solve the problem.