Generally, the bending of stamping galvanized sheet needs to rebound, mainly because the stamping process will leave internal stress in the material. If the springback treatment is not carried out, the sheet metal will be bent and deformed during the bending process after stamping, which will affect the quality and accuracy of the workpiece. Release and rebound treatment can effectively eliminate internal stress and improve the stability and accuracy of the plate.

The arrangement of release and pop-up usually includes two steps: first, complete the normal bending process; Then reverse bending is carried out on the reverse side of the bent waste, that is, the workpiece is folded back at a predetermined angle, and some deformation occurs in this process, and then it returns to the original angle, thus achieving the purpose of relieving stress. It should be noted that the springback deformation should be reserved in the design and calculation, and should not exceed the allowable range of bending, so as not to affect the quality and accuracy of the workpiece.

Therefore, in order to ensure high-quality products, it is necessary to release and rebound when bending and stamping galvanized sheets.