Adjustment parameters and common defects of piercing mill

The sign of adjusting correct:

Pipe billet bite is stable, the hollow pipe is thrown out smoothly, the piercing process is stable, the plug bar has no obvious jump, the quality of pipe inside and outside surface is good, the tube size is fine, and normal main motor load.

What are the principles of the piercing mill adjustment?

1. The rolling center line must coincide with the piercing center line or slightly lower than the piercing center line 3 ~ 5 mm.

2. The horizontal projection of the two rolls center line should be parallel to the rolling line at the same time.

3. The inclination of the two rolls relative to the perforated center line, that is, the Angle of advance must be equal.

4. Ensure that the plug bar has a high rigidity during the piercing process, the plug bar can not have obvious jumping and shaking.

5. The position of the plug head should be moderate to avoid front or rear stuck accidents.

6. The piercing process should be realized in the state of no cavity.

7. Piercing tools such as rolls, plug, and guide plate should not be severely worn.

8. Must observe frequently the operation of piercing mill and the use of tools, must frequently test the quality and size of the outer surface of the tube, and dealt with immediately if find problems.