During the processes of cold bending and stamping, the thickness of the sheet material is a key factor affecting the stability of the process and the quality of the finished product. Sheets of different thickness ranges exhibit significant differences in bending performance and rebound phenomena. Reasonable selection and control of sheet thickness is particularly important for improving the forming accuracy.

1. Common thickness range division

For thin plates (less than 1mm):

The typical thickness range is set at a span of 0.3mm.

For example: 0.5–0.8mm, or 0.8–1.2mm.

This ensures consistency in material strength while avoiding instability in forming due to excessive thickness variation.

For medium-thick plates (greater than 1mm):

The thickness span can be appropriately widened because their overall stiffness is higher, and their sensitivity to process fluctuations is relatively lower.

2. The difference in rebound between thick and thin plates

Thin plate: The rebound phenomenon is more obvious. Due to the small volume of the material involved in plastic deformation, the elastic recovery is relatively greater.

Thick plate: The rebound phenomenon is relatively weakened. As the thickness of the plate increases, the amount of plastic-deformed material increases, and the elastic recovery is "diluted", resulting in a corresponding reduction in the rebound amplitude.

This rule is particularly prominent in actual stamping and cold bending processes: The thinner the plate, the more likely the bending angle will deviate; while the thicker the plate, the closer the formed angle is to the design value.

3. Insights for Customers

When designing molds and selecting equipment, it is essential to take into account the thickness range of the material and its springback characteristics:

For thin plates: The springback can be controlled by optimizing the mold or through process compensation.

For thick plates: The springback issue is mitigated, but the forming force requirement significantly increases, and the equipment configuration needs to be strengthened accordingly.