How to deal with cracks in the bending part of stamping parts

How to deal with cracks in the bending part of stamping parts

Stamping parts will produce cracks during bending. The fundamental reason is that the internal stress in the bending deformation zone exceeds the strength limit of the material. In order to overcome this shortcoming, stamping parts manufacturers usually do this:

1. Reduce the amount of bending deformation; eliminate burrs outside the bending area (burrs will cause stress concentration in this area); place the side with burrs inside the bending area.

2. When bending the workpiece, it is best to make the bending direction perpendicular to the fiber direction of the material (rolling direction).

3. The bending radius cannot be too small, and the fillet radius should be increased as much as possible if the quality allows.

4. The surface of the bent blank should be smooth and clean, with no obvious bulges or scars.

5. An intermediate annealing process is used during bending to eliminate internal stress, and bending after softening rarely produces cracks.

6. When bending, large metal stamping and bending parts must be coated with lubricant to reduce friction during the bending process.