Reason ①: The cutting edge of the convex and concave Mold is worn, and the burr is larger, which leads to a larger shape and a smaller inner hole.
Solution: Grind the cutting edge.
Reason ②: The guide pin is worn.
Countermeasures: grinding the guide pin.
Reason ③: The guide system is worn out.
Solution: Replace the guiding system.
Reason ④: Improper feeding and feeding distance, material pressing and loosening links.
Countermeasures: adjust the feeder.
Reason ⑤: The mechanical properties of the silicon steel sheet are unstable (strength, elongation, etc.).
Countermeasures: Replace materials and control the quality of materials.
Reason ⑥: The punching sheet produces a concave sheet phenomenon, and the outer dimension is larger than the blanking die size.
Please keep the source and address of this article for reprinting：Product size changes during the stamping production process
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