In the process of processing and manufacturing cold-drawn steel pipes, attention should be paid to the improvement of procedures and various processes. Let me share with you how to ensure the continuous improvement of the wall thickness of cold-drawn steel pipes?
1. Tube billet heating
The heating should be uniform, and rapid temperature rise and fall is prohibited. The temperature should be kept steady and slow each time, and the temperature should not exceed 30℃.
2. Centering roller
Determine whether the centering roll is installed in place, adjust the center, opening angle and opening size of each action of the relevant core roll to be consistent, and the center of the core roll should be on the rolling line.
3. Rolling center line
Ensure that the rolling center line of the piercing machine is consistent with the center line of the piercing trolley, and avoid "up rolling" or "down rolling", so that the tube blank can be uniformly stressed during piercing.
4. Rolling tools
For the worn plugs, guide plates, rolls and other rolling tools, they should be replaced in time.
5. Installation of rolling tools
The center of roll distance and lead distance must be on the rolling line. Ensure that the center line of the lead distance and the roll distance is on the center line of the piercing and rolling, that is, the upper and lower roll distances are equal, and the left and right lead distances are equal.
6. Perforated ejector
The perforated ejector rod generally chooses cold-drawn steel pipes with an outer diameter of Φ108mm-Φ114mm, a wall thickness of ≥25mm and a uniform wall thickness.
7. Rolling mandrel
The mandrel should be processed by a thick-walled tube with a thicker wall. For a mandrel with a smaller size, a solid billet can be used instead. Cold-drawn steel pipes and solid billets with uniform wall thickness can greatly reduce the probability of bending deformation of the mandrel, and can effectively improve the wall thickness accuracy of the steel pipe.
