Seamless steel tube perforator piercing point on-line regulating device

Abstract

The invention discloses a seamless steel tube perforator piercing point on-line regulating device, which comprises a piercing rod and a piercing rod trolley, wherein the piercing point is at one end of the piercing rod and is a cone; the terminal line of the cone is a straight line with transitional curves at two ends; and the other end of the piercing rod is arranged on the piercing rod trolley. The seamless steel tube perforator piercing point on-line regulating device is characterized by also comprising a locking device, wherein the position of the piercing rod trolley is locked by the locking device; when the piercing point presses a tube blank of a seamless steel tube, the locking device can move the locked position of the piercing rod trolley along the moving direction of the tube blank, so that the piercing rod can move together with the piercing rod trolley by means of a rolling force. According to the device, the piercing point can move along the moving direction of the tube blank in a tube blank perforation process, so that the outside diameter of the piercing point in a tube blank perforating forming region can be reduced to compensate for the increase of the outside diameter of the piercing point with heat expansion in the tube blank perforation process; and thus, the outside diameter of the piercing point in the tube blank perforating forming region can keep stable and constant, and the inside diameter of a tubular billet formed by tube blank perforation is not changed.

Description

technical field [0001] The invention relates to the production of a seamless steel pipe piercing machine, in particular to the treatment of the plug of the piercing machine ejector rod after being heated and expanded during the production process. Background technique [0002] As the first process in the production of hot-rolled seamless steel pipes, tube blank piercing is used to pierce and roll solid blanks (ie tube blanks) into hollow capillary tubes. The wall thickness of the capillary tube formed after the tube blank is pierced and the tolerance level of the outer diameter have a great influence on the subsequent tube rolling and sizing process, and determine the qualified rate of the finished steel tube. [0003] Such as figure 1 and figure 2 As shown, the piercing part of the piercer mainly includes a roll 2, a guide plate 3 and a plug 41. The rolls 2 are left and right, arranged obliquely relative to the rolling line, and the guide plate 3 is two upper and lower, ...

AI Technical Summary

Problems solved by technology

However, the tube blank 1 is generally heated to about 1200°C, and the whole piercing process lasts for more than 30 seconds. The left and right rollers 2 and the plug 41 are always in contact with the tube blank 1 during the process, and the temperature can reach 650°C-750°C. The plug 41 will be heated and expanded during the piercing process of the tube blank 1, and the plug 41 will expand during the piercing process. The inner diameter of the annular pass that gradually expands to cause the perforation of the tube blank 1 is constantly increasing in the process, while the expansion of the roll 2 is extremely limited due to different materials, and the outer diameter of the capillary tube formed by the tube blank 1 remains basically unchanged, which will make the tube After the billet 1 is formed, the wall thicknesses of the front end and the rear end of the capillary tube are inconsistent, and there is a problem that the wall thickness tolerance of the front end of the steel pipe is too large, and the wall thickness tolerance of the rear end is too small, which adds difficulties to the subsequent process and will also affect the qualification of the steel pipe. rate, reducing work efficiency and increasing production costs

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