The reason for the misalignment of the head or tail of the steel pipe

The reason for the misalignment of the head or tail of the steel pipe

1) The position of the import and export rollers is incorrect;

2) The center of the ring frame is wrong;

3) The roundness of the seam pressure roller is not good, and the position of individual pressure rollers is deviated;

4) The forming is not good, and the difference between the two sides of the formed tube blank is large;

5) The opening slit width is above 150mm;

6) Caused by pressure fluctuations in the hydraulic system.