CPE process is the use of oblique rolling piercing machine to replace hydraulic piercing machine and skew rolling extension machine, combined with the traditional pipe method to produce large diameter straight seam steel pipe technology.
When the CPE process is applied, the metal at the end of the tube is moved away from the deformation zone until the metal leaves the roll. The process of stabilization and the process of instability are markedly different, which is easily observed in production. Such as a capillary on the head and tail size and the middle size there is a difference, usually the diameter of the capillary front, tail diameter is small, and the middle part is the same. Large head-to-tail size deviation is one of the characteristics of unstable processes. The reason for the large diameter of the head is that the frictional force on the contact surface between the metal and the roll is gradually increased until the fully filled deformation zone is reached, especially when the front end of the tube is in contact with the plug At the time of the encounter, the axial extension of the metal is resisted by the axial resistance of the plug, resulting in reduced axial extension deformation and increased lateral deformation, with no outer end restriction, leading to a large front-end diameter. Tail diameter is small, because the end of the tube is beginning to penetrate the head, the head resistance decreased significantly, easy to extend the deformation, while horizontal rolling is small, so the outer diameter is small.
First, because the pressure is not perforated perforation than the limit, the billet weight increased, the maximum weight can be the traditional billet tube 500KG increased to 1400KG, the length of the pipe up to 16-22M.
Second, because the skew rolling piercing the deformation of large, fast, and thus high productivity, can reduce the deformation of the pipe jacking machine, roll die seat can be cited should be shortened, which is the result of the increase in the wall thickness.
The final product range is expanded to produce a diameter of up to 244.5MM. Cup bottom is small, finished product rate is high. Process is simple, equipment investment costs less.Compared with the mandrel mandrel mill, telex, electronic control equipment is simple and convenient operating.
