Reasons and Solutions for Chip Jumping of Die Scrap in Hardware Stamping Process

The so-called scrap jumping refers to that the scrap goes up to the die surface during the stamping process. If you do not pay attention in the stamping production, the upward scrap may crush the product, reduce the production efficiency, and even damage the mold.

Reasons for scrap jumping include:

1. The straight wall section of the cutting edge is too short;

2. Vacuum negative pressure is generated between the material and the punch;

3. The template or punch is not demagnetized or the demagnetization is poor;

4. An oil film is formed between the punch and the product;

5. The punch is too short;

6. Excessive blanking clearance;

Or the above reasons work at the same time.

For scrap jumping, we can take the following measures:

1. If allowed, increase the length of the straight section of the lower die edge appropriately;

2. The punch and formwork shall be completely demagnetized before installation and assembly;

3. If allowed, the punch can be made into a slant blade or added with a blowhole. If the production batch is large, the parent punch can be used for blanking;

4. During design, appropriate blanking clearance shall be selected for different materials. If there is still material jumping, the clearance can be appropriately reduced;

5. Attention should also be paid to the depth of the punch into the lower die edge. If necessary, increase the length of the punch.