When metal stamping parts are bent, what are the reasons for the unqualified size and shape?

When metal stamping parts are bent, what are the reasons for the unqualified size and shape? 1. Measures to reduce springback caused by material springback: ◆Select stamping materials with large elastic modulus and small yield point and stable mechanical properties. ◆Increase the correction process and use correction bending instead of free bending; ◆The material should be annealed before bending, so that the cold-work hardened material is softened in advance and then bent into shape; ◆If the shape deformation occurs during the stamping process and it is difficult to eliminate; it should be replaced or trimmed The inclination of the convex mold and the concave mold, and the gap between the convex and concave molds is equal to the minimum material thickness. ◆Increase the contact area between the die and the workpiece, and reduce the contact area between the punch and the workpiece. ◆Using the'overcorrection' approach to reduce the impact of rebound. 2. The positioner is worn out and deformed, which makes the strip positioning inaccurate, and the positioner must be replaced with a new one. 3. In the non-guided bending die, when adjusting on the press, the lower dead center position of the press slider is not adjusted properly, which will also cause the shape and size of the bending part to be unqualified. 4. The material pressing device of the mould is out of order or has no effect at all. The pressing force must be re-adjusted or the pressure spring must be replaced to make it work normally. Previous post:Several solutions for side scratches on stamping and drawing parts