In the production process of making steel pipes on the used high frequency tube mills production line, three links of raw materials, welding technology and roll adjustment should be focused on control.

The used high frequency tube mills must control the roll adjustment at last

It can be seen from the causal analysis diagram of steel pipe waste produced during the production of the used high frequency tube mills that roll adjustment is a steel pipe operation process. In the production process, when the rolls are damaged or worn severely, some rolls need to be replaced on the unit, or a certain variety has been continuously produced in sufficient quantities, and the entire set of rolls needs to be replaced. At this time, the rolls should be adjusted to obtain good steel pipe quality. If the rolls are not adjusted properly, it is easy to cause the torsion, lap welding, edge waves, bulging and indentation or scratches on the surface of the pipe body, and large ovality of the steel pipe. Therefore, the roll adjustment should be mastered when changing the rolls. Skill.

(1) To change the steel pipe specifications, the complete set of rolls is generally replaced. The method of roll adjustment is: use a steel wire to pull a center line from the unit entrance to the exit, and adjust so that the hole pattern of each frame is on a center line and the bottom line of the forming meets the technical requirements. After changing the roll specifications, first make a comprehensive adjustment of the forming roll, guide roll, squeeze roll, and sizing roll, and then focus on the closed pass, guide roll, and squeeze roll adjustment of the forming roll.

(2) The role of the guide roller is to control the direction of the pipe seam of the steel pipe and the height of the bottom line of the pipe blank, ease edge extension, control the rebound of the pipe blank edge, and ensure that the pipe seam is straight and does not twist into the squeeze roller. If the guide roller is not well adjusted, it is easy to cause welding defects such as torsion, lap welding, and edge waves during the welding of the steel pipe.

(3) The squeeze roller is the key equipment of the pipe welding unit, and its function is to complete the pressure welding of the pipe body with the edge heated to the welding temperature under the squeeze force of the squeeze roller. In the production process, it is necessary to control the size of the opening angle of the squeeze roller. If the squeezing force is too small, the strength of the weld metal will decrease and cracks will occur after the force is applied; if the squeezing force is too large, the welding strength will be reduced, and the amount of external burrs will increase, which is likely to cause welding defects such as lap welding.

(4) During the slow start process of the used high frequency tube mills, pay close attention to the rotation of the rollers at all parts, and adjust the rollers at any time to ensure that the welding quality and process dimensions of the welded pipe meet the specified requirements.

The three important links of raw material, welding and roll adjustment in the production process of welded steel pipes are carried out on the used high frequency tube mills. If strict control is implemented, the quality of welded pipes will be effectively improved.

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