In the progressive die, the shape of the metal stamping part is formed by punching the surplus material around the stamping part. The main reason of turning over and twisting is the influence 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 upward), and the side close to the punch is compressed. 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 state of the material changes correspondingly. With the increase of the pressing force, the material near the punch side is stretched (the compression force tends to decrease), while the material on the die surface is compressed (the tensile force tends to decrease). The overturning of stamping parts is caused by the stretching of the material on the die surface. Therefore, when blanking, pressing and pressing the material is the key to prevent the stamping parts from turning over and twisting. The causes and Countermeasures of turning over and twisting of stamping parts during bending.
It is caused by the burr of the blanking part. It is necessary to study the cutting edge and check whether the blanking clearance is reasonable.
When blanking, the stamping parts have been turned over and twisted, which leads to poor forming after bending, which needs to be solved from the blanking station.
It is caused by the instability of stamping parts during bending. Mainly for U-shaped and V-shaped bending. In order to solve this problem, the key to solve the problem is to carry out the lead position before bending and during the bending process, and to hold down the material during the bending process to prevent the stamping parts from sliding during bending.
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