Effect of Roller Adjustment on the Quality of ERW Pipe

In the production of erw pipe, there is a process called roll adjustment. In the production process, the roll damage or wear serious, the need to replace some of the roll on the unit, or a continuous production of a certain number to meet the needs of the entire roll replacement. At this time should be conditioning rolls, in order to achieve outstanding steel quality. Such as the roll conditioning is not good, easy to form steel pipe seam changes, lap welding, marginal waves, drum kits and pipe body surface with indentation or scratches, oval steel pipe and other shortcomings, therefore, roll change should grasp the roll conditioning tips.
 
1, Replace the standard steel pipe, usually the whole roll to be replaced. Roller conditioning approach is: with wire from the entrance to exit pull a base line, adjust, so that each hole in a base line, and make the molding line with the skill requirements. Replacing the standard roller, the first of the forming roller, guide roller, kneading roller, sizing roller for a full conditioning, and then focus on the closed roller forming roller, guide roller, kneading roller conditioning.
 
2, The effect of the guide roller is to control the pipe suture direction and the height of the bottom of the tube to ease the marginal extension, control the edge of the tube rebound, to ensure seamless pipe without changing into the roll. Such as the guide roller conditioning is not good, in the steel pipe welding process, easy to form changes in steel pipe joints, lap welding, marginal waves and other welding shortcomings.
 
3, The kneading roller is the key equipment of the pipe unit, the effect is the edge of the tube is heated to the welding temperature of the kneading roller kneading effect under the pressure of the end of the pressure welding. In the production process, to control the size of the kneading roll opening angle. When the kneading force is too small, the strength of the weld metal decreases, cracking occurs after the force is applied. When the kneading force is too large, the welding strength is decreased and the amount of the external burr is added, so that the welding defect such as lap welding is easily formed.
 

4, In the slow start of the pipe unit in the process, should pay close attention to the various parts of the roll rolling conditions, at any time conditioning rolls to ensure the quality of welding pipe welding skills and standards meet the requirements of the request.