Straightening method of DSAW pipe:
First, the DSAW pipe bends in the same direction
Reasons: Normalizing seam is insufficient, there is thermal stress on the side of welded pipe, and it bends in one direction after cooling.
Solutions: 1. Adjust the middle roll and increase the deflection curve appropriately; 2. Straighten twice; 3. Temper the whole pipeline when it cannot be straightened directly.


2. DSAW tube can't bend
Reasons: 1. The pressure between the three rollers is not consistent; 2. The straightening rollers wear more.
Solution: Check whether the adjustment of straightening roll is loose or not, and straighten the contact line length between the three with the sample rod.


Thirdly, the length of DSAW tube is shorter
Reasons: The difference of three rollers straightening roll angle; straightening pressure is large.
Solution: adjust the rolling angle as consistent as possible; adjust the straightening pressure properly.


Fourth. The DSAW tube is at the top of the bend
Reason: The distance between drums is too large.
Solution: Suitable diameter for smaller spacing straightener.


Five. The head of the DSAW tube is not circular
Reasons: The contact stages between the three straightening rollers are not aligned or overlapped, and the roll pressure is too high.
Solution: Appropriately adjust the angle between the drum and the drum, the pressure on the drum.


With the development of science and technology, more and more new technologies have been applied to steel tube straightener. If the company improves and applies the seven-roll straightener, model 3-1-3 pipeline straightener. It adopts a completely different structure from the normal six-roll straightener and solves the problem of adjusting the leveling roll group in the circumferential direction. The utility model is characterized in that the driving roll is adjusted by adjusting the tilt of the iron to adjust its height, so that the three straightening rolls can be radially adjusted at 120 degrees in the circumferential direction, while the straightening center line remains unchanged. The advantages are that the structure is simple and easy to adjust, and the pipeline is evenly pressed on the circumference. Therefore, high precision straightening, good quality, large applicable specifications.