For continuous punching bending stamping materials, metal particles or scum easily attached on the surface of working parts, stamping parts appear scratches.
Bending direction and material of rolling direction parallel, produces the crack on the surface of the stamping, lower the workpiece surface quality.
When two or more parts for bending, should as far as possible ensure the bending direction of certain Angle with the rolling direction;
Burr side as the outer surface during bending, parts easy to produce cracks and scratches;
So when bending burr surface should be as the bending inner surface;
Die radius is too small, curved areas shock.
Polishing of die, increase the die radius, can avoid bending a scratch;
Convex concave die clearance should not be too small, the gap is too small will cause thin scratches.
Check point in the process of stamping die clearance changes;
In order to make the metal stamping both accord with the requirement of accuracy is often used in the bottom of the bending of the pressure, the pressure plate in bending, the spring on the positioning pin hole, plate and return hole material is compressed into indentation, reason should be given to adjust.
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