Reasons For Turnover And Distortion During Stamping

In the progressive die, the shape of the stamping part is formed by the method of cutting the remaining material around the stamping part. The main reason for turning over and twisting of punched parts is the impact of blanking force. During blanking, due to the existence of blanking clearance, the material is stretched on one side of the female die (material warps upwards) and compressed on the side near the male die. When using the discharge plate, press the material with the discharge plate to prevent the material on the concave side from warping upwards. At this time, the stress condition of the material will change accordingly. With the increase of the pressing force of the discharge plate, the material on the side of the punch is stretched (the compression force tends to decrease), while the material on the surface of the die is compressed (the tensile force tends to decrease). The overturning of stamping parts is caused by the material on the concave die surface being stretched. Therefore, during blanking, pressing and pressing the material is the key to prevent the blanking parts from turning over and twisting.