In the production process of ERW steel pipe, when the roll is damaged or worn seriously, it is necessary to replace some rolls on the equipment, or to continuously produce enough rolls, it is necessary to replace the whole set of rolls. At this time, the rolls should be adjusted to obtain good steel tube quality. If the roll is not adjusted properly, it is easy to cause torsion, lap welding, edge wave, embossing and scraping drum surface and pipe body surface, and the ellipticity of steel pipe is large. Therefore, the adjustment of the reel should be mastered when replacing the reel. Skill.


1) Replacement of steel pipe specifications, generally replace the whole set of rollers. The method of adjusting roll is to pull the steel wire out of the center line from the entrance to the exit of the unit and adjust the type of each hole on the center line. The forming bottom line meets the technical requirements. After changing the roll specifications, the forming roll, guide roll, extrusion roll and sizing roll are adjusted comprehensively, and then the closed pass, guide roll and extrusion roll are formed. Volume adjustment.


2) The function of the guide roller is to control the direction of the pipe joint and the height of the billet bottom line, reduce the edge extension, control the rebound of the billet edge, and ensure that the pipe joint is straight and will not be twisted into the roller. If the guide rollers are not well adjusted, welding defects, such as torsion, lap welding and edge wave of steel pipe joints, are easily caused in the welding process of steel pipe.


3) Extrusion roll is the key equipment of welded pipe unit. Its function is to complete the pressure welding of the tube whose edge is heated to the welding temperature under the pressure of the roller. In the production process, the opening angle of the extrusion roll is controlled. When the pressure is too low, the strength of the welded metal decreases, and cracks occur after applying force.  When the pressure is too high, the welding strength decreases and the amount of external burrs increases, which can easily lead to welding defects, such as lap welding.


4) When the welded pipe device starts slowly, it should pay close attention to the rotation of each part of the roll, and adjust the roll at any time to ensure that the welding quality and process size of the welded pipe meet the requirements. Requirements specified.