ERW steel pipe manufacturers, in the production of high-frequency welded pipe process, will face the tube surface was scratched the situation, the main reason for this is due to the guide roller and squeeze roller caused. The following specific analysis.
1. Scraping caused by the guide roll generally occurs on both sides of the high-frequency welded pipe, the characteristics of the wound is relatively large, continuous strong. Reasons include:
(1) The height of the guide sleeve position is not correct, such as the guide roller bearing damage, the guide roller can not be a good control of high-frequency welded pipe, so that friction with the guide sleeve caused by scratches.
(2) When the guide roll deviation from the high-frequency welded pipe production line rolling center line is too large, the guide sleeve and guide roller relative difference is too large, resulting in both sides of high-frequency welded pipe scratches.
2. Scratches caused by high-frequency welding squeeze rollers occur mainly at the bottom of high-frequency welded pipe. Reasons include:
(1) The hole does not match, resulting in ERW steel pipe surface scratches, the hole does not match the factors are: squeeze roller bearing damage, squeeze roller axial movement, squeeze roll hole size is not the same, the two extrusion Roller height position is different from the extrusion roller bending and assembly instability.
(2) Squeeze roller height does not match. The lower edge of the squeeze roll hole pattern should be consistent with the height of the rolling line, and the height of the guide roll is determined by the wall thickness of the ERW steel pipe. If the guide roller is too low, the edge of the extrusion roller hole rounded corner of the high-frequency welded pipe will cause the bottom of the scratches.
(3) Squeeze pressure on the roller is insufficient. Especially the two-roll structure of the squeeze roller device, when the pressure on the lack of ERW steel pipe tension in the role, the roller will appear on the elevation angle, the R edge of the hole prominent, resulting in high-frequency welded pipe Scratch the lower part. When the squeeze roller hole R-round grinding sharp, it will increase the scratches.
