Piercer roller for extra-thick walls

Abstract

The invention discloses a piercer roller for extra-thick walls. The piercer roller comprises an entrance cone, a first exit cone and a second exit cone which are connected to each other in sequence, and the center position of the roller body is provided with a through hole; the half cone angle of the entrance cone is 7-8 DEG, and the half cone angle of the first exit cone is 14-16 DEG; and the half cone angle of the second exit cone is 16.5-18.5 DEG. According to the piercer roller for the extra-thick walls, the outer edge of the end of the entrance cone is provided with a chamber with the radius of 20 mm, and the smooth engagement of tube blanks in the rolling process is ensured. By arranging the roller surface angles of the entrance cone, the first exit cone and the second exit cone andthe outer edge chamber of the end of the second exit cone, the position of an ejector rod is closer to the front part, and the top extension is increased; and the penetrability and uniform wall thickness of seamless tubes with the extra-thick walls in the piercing process are ensured. The roller surface is provided with knurling, and the friction force of the roller and the tube blanks is increased; and the engagement force in the rolling process is increased.

Description

technical field [0001] The invention relates to the technical field of hot-rolled seamless pipes, in particular to a piercer roll for an extra-thick wall. Background technique [0002] The roll is an important part of the piercing machine. Its function is to drive the tube blank to rotate and advance, so that the tube blank can be deformed and rolled in the closed space composed of the plug, the guide plate and the roll. At present, when rolling extra-thick-wall seamless pipes, the penetration of the end of the seamless pipe or the wall thickness accuracy of the extra-thick-wall seamless pipe cannot be guaranteed in the general rolling process. To sum up, how to provide a roll that can not only ensure the penetration of the tail end of the seamless pipe during rolling but also ensure the uniform wall thickness of the extra-thick wall seamless pipe has become a technical problem to be solved urgently by those skilled in the art. Contents of the invention [0003] The purpo...

AI Technical Summary

Problems solved by technology

At present, when rolling extra-thick-wall seamless pipes, the general roll rolling process cannot guarantee the penetration of the end of the seamless pipe or the wall thickness accuracy of the extra-thick-wall seamless pipes.

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