What causes the punch to break during the metal stamping process
A punch is a metal part on a metal stamping die, also called a protruding die, an upper die, a male die, or a punching stick, punching needle or punch. It is installed on the stamping die and is in direct contact with the metal material to carry out continuous punching, stamping and punching operations, so that the processed materials are separated or plastically deformed, so as to obtain the required finished stamping parts or semi-finished stamping parts. The punch is divided into A-type punch, T-type punch, special-shaped punch.
In the process of metal stamping parts, the punch will break for the following reasons. The following Dongmo will introduce to you:
1.The closing height of the stamping die is too low, and the part where the punch cuts into the knife edge is too long, so the closing height should be adjusted;
2.Improper positioning of the material causes the punching punch to cut unilaterally, and the uneven force causes fracture, so the positioning or feeding device should be adjusted;
3. The scrap of the lower mold blocks the cutting edge, causing the punch to break. The large blanking hole should be re-drilled to ensure smooth blanking;
4. The guide of the punching plate is poor, causing the punch to be broken due to uneven force on one side of the punch, and the punching plate gap should be rebuilt;
5. The cutting edge of the punch is too short, and the break caused by the interference with the punching plate, the punch should be replaced to increase the length of the cutting edge;
6. The punch is not fixed well, and the fracture caused by the up and down movement should be re-fixed to make it stable;
7. The cutting edge of the punch is not sharp, the cutting edge should be re-ground;
8. The surface of the punch is strained, and the fracture caused by the uneven force of the material is removed, the punch should be replaced again;
9. The punch is too thin and too long and the strength is not enough, the type of punch should be changed.
10. The offset of the fixed part of the punch and the guide part makes the punch not smooth up and down, so it should be repaired;
11. The punch hardness is too high or the punch material is wrong, the punch material should be replaced or the heat treatment hardness should be adjusted.
