Part stamping is widely used, including automotive, medical, electronics, household appliances and other industries. The choice of material for stamping is very important. Stamping factories require strict material thickness requirements, because once the thickness of the material changes a lot, using the same mold and clearance for production will affect the quality and accuracy of the product, and the mold will be damaged in heavy cases. Production accidents can occur even when producing large stampings. According to Yiwei's accurate analysis, the thickness tolerance of stamping materials affects the following process.

1) During the stamping process, the positive deviation of the thickness of the stamped material is too large or the negative deviation is too large, which may cause burrs. Materials with too much negative deflection increase elasticity and affect dimensional accuracy. Materials with too much positive deflection will increase piercing force and piercing work, which can damage the punching equipment. Uneven material thickness can also lead to one-sided burrs on stampings.

2) In the bending process, materials with large negative deflections have large spring recoils, resulting in inaccurate shapes and sizes of stamped parts, and easily cause deflection and twisting. If the material thickness positive deviation is too large, it will cause the curved surface to shrink, affect the surface quality of the stamping part, and increase the bending force and bending work, which may damage the equipment. Uneven thickness can also lead to inaccurate shapes and sizes of stamped parts.

3) In the process of deep drawing, if the negative deviation of the material thickness is too large, it will lead to uneven shape due to springback, as well as insufficient height of the stamping part and small hole and bottom of the stamping part, at the same time, the pressure will decrease. In addition, the relative increase in the gap between the punch and the die causes tensile wrinkling of the material, which makes it difficult for the metal material to flow, thereby increasing the tensile force and causing the tensile stamping to break.