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Precautions when forming seamless steel pipes

Some hole design and adjustment methods will directly affect the quality of seamless steel pipe forming and sizing, so we should pay attention to the following matters when dealing with seamless black steel pipe forming:

1) Before the belt is worn, the hole shape of each rack should be adjusted, and the size of each pass should be measured to ensure that it matches the seamless pipe sizes and can enter each rack stably. In the adjustment, the force should be balanced, and it should not be forced to deform on one frame, so as to ensure the stable and even change of the raising angle;

2) Traditional roll forming skills, with single radius, double radius, plus two, three, four or five rolls kneading rolls, two or four rolls sizing to ensure the forming quality. This traditional roll forming technology is mostly used for rectangular tube units with a diameter less than φ11mm;



3) In the production of seamless steel pipes, control and adjust the forming and sizing stand equipment of the unit. Stacking errors and roll bounces will affect the production of seamless steel pipes for older units;

4) American row roll forming skills, voestalpine's CTA forming skills, Japan Nakata's FF or FFX flexible forming skills, etc., have a good guarantee of the shape of the welded joint after forming and good appearance quality, and are suitable for standard A wider range of seamless steel pipes;

5) During the adjustment process of the unit, first of all, it should be ensured that each pass of the vertical center line is consistent, and the center is used as the base axis to find the positioning scale and center sleeve is a straight line and cannot show curve jumping;

6) In order to reduce elastic deformation, 2 to 3 passes should be added to the processing deformation passes of seamless steel pipes compared with ordinary rectangular pipes;

7) In the deformation structure, the initial deformation point of view should be reduced to ensure the stable bite of the seamless steel pipe, the central curved point of view should be properly enlarged, and the rear deformation should be properly reduced. Adding deformation passes not only reduces the deformation force, but also When the surface stress of the strip occurs, the gradient of the surface stress increase is slowed down, which can prevent the seamless steel pipe from cracking;

8) Various forming skills have different advantages and disadvantages, and are suitable for different conditions. According to the use of seamless steel pipes, carefully consider when selecting equipment to select different forming skills.

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