The control of the wall thickness of the steel pipe is a difficult point in the production of steel pipes. The measures that improve the thickness of wall thickness in production mainly include the following aspects:
1. Heat
The heating should be uniform and the temperature is prohibited. Maintain smooth and slowly each increase, and the maximum lifting temperature does not exceed 30 ° C.
2. Concentrated roller
Determine whether the installation of the heart roller is in place, adjust the center of the related core roller, the opening angle, and the opening size of each movement. The center of the core roller should be on the rolling line.
3. Rolling center line
Make sure that the centerline of the pitch rolling machine is consistent with the centerline of the perforation, and avoid "upper rolling" or "down rolling", so that the pipeline blank is uniformly stressed during perforation.
4. Rolling tools
Rolling tools such as the wear, guide plate, and rolls should be replaced in time.
5. Installation of rolling tools
The center of the roller distance and guide distance must be on the rolling line. The central line of the guidance distance and the roller distance is on the center line of the rolling rolling, that is, the upper and lower rollers are equal, and the left and right guides are equal.
6. Pole top rod
The perforated top rod is generally selected from the thick wall tube with φ108mm-φ114mm, wall thickness requirements ≥25mm and uniform wall thickness.
7. The moving movement stick
The core rod should be processed with thick wall tube with thick wall thickness. For the smaller specifications, the core rod can be replaced by solid ingredients. The thick wall tube and solid billet with wall thickness can greatly reduce the probability of bending and deformation of the core rod, which can effectively improve the wall thickness accuracy of the steel pipe.
8. The accuracy of the core stick
The details of the core rod are relatively large. Generally, the outer diameter of the car is generally used to break the mouth welding, or the long material is directly carried. The external machining accuracy of the core rod is controlled at ± 0.1mm, and the straight degree deviation of the core rod does not exceed 5mm. During welding, a section of the two -section rod is inserted into a precision -processing sales to locate to prevent the total straight degree deviation caused by the welding.
9. Improve the process
Improve the process to prevent the middle of thinning and wall thickness from increasing the control range of the control range, and improve wall thickness accuracy.
