Root cause: (1) The gap between the mold cutting edges is too large or too small and uneven. (2) The punch mold’s cutting edges become dull.(3) The displacement of the punch and die occurs due to prolonged production, causing misalignment and resulting in burrs on one side.
Solutions: (1) Ensure the processing accuracy and assembly quality of the punch and die, ensuring the correct gap and firm installation during assembly, and keeping the mold end face parallel to the press’s working surface. (2) The precision of the mold cutting surfaces should be high, and the press should have sufficient punching force. (3)Punching needle will be replaced every 1200 times. (4) Preparing two inspection tools, one for operator ,the other for inspector, ensure the unqualified product can not been output.