Effective methods to avoid springback of precision stamped parts

Metal materials, after being stamped, undergo plastic deformation to obtain precision stamped parts of specific shapes and dimensions. However, due to plastic deformation, elastic deformation is inevitable, especially during bending forming, where springback is easily generated. Springback affects the shape and precision of the workpiece. So, what measures can be taken to effectively control springback?

Manufacturers can take the following measures to avoid springback:

1. When selecting raw materials, under the premise of meeting the workpiece requirements, materials with a higher modulus of elasticity should be selected as much as possible.

2. When designing the shape of the workpiece, if the shape and degree of bending are complex, the stress situation in various directions will also be complex during a single bending process. In this case, using a combination of several components can alleviate the springback problem.

3. Reducing the radius (R) of the bent portion can also solve the springback problem to some extent.

4. Use draw beads to address springback issues. By strategically positioning the drawing points, the material flow direction can be effectively altered, and the feeding resistance on the blank holder surface can be effectively distributed, improving the material's forming condition. Adding draw beads to areas prone to springback ensures a more uniform stress distribution.

5. During preforming design, the workpiece can be distributed across different processes to achieve the desired forming effect. By eliminating internal stress during the forming process, springback-induced defects can be mitigated.

6. Optimize the blank holder force and adjust the material flow direction to improve internal stress within the workpiece. Generally, increasing the blank holder force allows for more complete drawing, reducing springback.

In summary, avoiding springback in precision stamping parts can be addressed at three different time points: workpiece design, process design, and mold structure design. Controlling these three time points effectively mitigates springback problems during production.