Why do automobile terminal stampings appear to be twisted?

The automobile terminal stamping parts are formed in the progressive die by punching the leftover material around the stamping parts to form the shape of the stamping parts. The main reason for turning over and twisting of automobile terminals is the influence of 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 upward) and compressed on the side of the punch. When using the unloading plate, use the unloading plate 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 pressing the material is the key to prevent the car terminal from turning over and twisting. Reasons and countermeasures for turning over and twisting of automobile terminals during bending. 1. It is caused by the burrs of the punched 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 punching process, which leads to poor forming after bending, which needs to be solved from the punching 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 automobile terminal from slipping during bending are the key points to solve the problem.