The workpiece formed by direct stamping after uncoiling the coil material is affected by various factors, leading to deformation of the workpiece, mainly including the following aspects:

1. Physical properties of the material: The coil material is formed by winding, and there are internal stresses. If pressed directly, these stresses will be released, causing deformation of the workpiece.

2. Stress in stamping process: During the stamping process, the material will be subjected to certain stresses, which can also cause deformation of the workpiece.

3. Precision of stamping molds: If the precision of the stamping mold is not high or the mold is severely worn, it can lead to inaccurate dimensions and shapes of the stamped workpiece, thereby causing deformation of the workpiece.

4. Improper adjustment of the stamping machine: If the adjustment of the stamping machine is improper, such as the distance between the punch and the mold being too large or too small, or the stamping speed being too fast or too slow, it can cause deformation of the workpiece.

Therefore, in order to avoid workpiece deformation, it is necessary to perform leveling treatment before stamping to remove internal stress in the material, while ensuring the accuracy of the stamping mold and appropriate adjustment of the stamping machine.