Three-roller full-floating mandrel continuous pipe rolling mill and rolling process thereof

Abstract

The invention discloses a three-roller full-floating mandrel continuous pipe rolling mill, which comprises a first deformation machine frame, a second deformation machine frame, a third deformation machine frame, a fourth deformation machine frame, a fifth deformation machine frame, a sixth deformation machine frame and a mandrel loosening machine frame, wherein detection elements which are connected with a control unit are arranged behind the second deformation machine frame, the third deformation machine frame, the fourth deformation machine frame and the fifth deformation machine frame; hydraulic slight screwdown devices which are connected with the control unit are arranged on the third deformation machine frame, the fourth deformation machine frame, the fifth deformation machine frame and the sixth deformation machine frame; a mandrel dropping machine is arranged behind the mandrel loosening machine frame; a measuring device which is connected with the control unit is arranged behind the mandrel dropping machine; the control unit determines a compensation value of each deformation machine frame on the deviation of tail bamboo joints according to a preset value or real-time measurement value of the outer diameter and wall thickness of a pierced billet; and after receiving signals sent by the detection elements, the control unit controls the hydraulic slight screwdown devices on the deformation machine frames behind the deformation machine frame corresponding to a detection unit for sending the signals to slightly screw down. The three-roller full-floating mandrel continuous pipe rolling mill also discloses a rolling process for the three-roller full-floating mandrel continuous pipe rolling mill. By the three-roller full-floating mandrel continuous pipe rolling mill, the yield of metal can be improved, and the quality of steel pipes can also be improved.

Description

technical field [0001] The invention relates to production equipment and production technology of hot-rolled seamless steel pipes, in particular to a three-roller full-floating mandrel continuous pipe rolling mill and its rolling technology. Background technique [0002] The traditional full-floating mandrel continuous rolling tube production method is as follows: in the hot rolling tube workshop, the continuous casting round tube billet is cut into a length of about 1.5-4.5m by cold sawing (or other cutting methods); in the traditional Heating the circular tube billet in the range of 1.5-4.5m in the ring furnace, heating it to 1150-1280°C and then sending it to perforation, piercing it into a capillary tube with a maximum length of 11m on the piercing machine, and then reducing the diameter and extending it on the hollow billet reducing machine. The longest hollow billet is 14.1m; then, according to the production process of continuous rolling tube with full floating mandre...

AI Technical Summary

Problems solved by technology

Using these methods, the three-roller full-floating mandrel continuous rolling process can basically suppress the generation of bamboo knots at the head, but cannot control the tail bamboo knots, so the "slub phenomenon" cannot be effectively controlled

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