What are the reasons for the hair and scratch of the rod when the cold heading machine screws?

The problems, causes and solutions of galling and scratching when the cold heading machine is screwed in. Reason 1, poor phosphating quality on the surface of the material, and scratching and scratching of the material.

2, the material size is too large

3. The die size is small and the surface roughness is poor.

4. The size of the previous mold was too large.

Solution 1. Replace qualified materials.

2. Replace qualified materials

3. Replace the qualified mold.

4, replace the qualified mold