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Piercing plug device of piercer, piercer and production method of seamless steel tubes

A technology of seamless steel pipe and production method, which is applied in metal rolling, manufacturing tools, mandrels, etc., can solve the problem of uncontrollable defect rate on the inner surface of high-alloy steel pipe, and achieves low equipment modification difficulty, good application effect, and internal The effect of improved surface quality

Inactive Publication Date: 2013-08-14
PANGANG GROUP CHENGDU STEEL & VANADIUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the inner surface defect rate of carbon steel, low-alloy steel pipe and high-alloy steel pipe with large outer diameter and thick wall cannot be controlled to a low level.

Method used

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  • Piercing plug device of piercer, piercer and production method of seamless steel tubes

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Experimental program
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Embodiment Construction

[0020] Hereinafter, a piercer plug device, a piercer, and a seamless steel pipe production method according to the present invention will be described in detail with reference to exemplary embodiments.

[0021] A plug device for a piercing machine according to an exemplary embodiment of an aspect of the present invention includes a plug and a push rod. An air pipeline is formed inside the plug and the ejector rod, and one or more air outlets communicating with the air pipeline are arranged at the nose of the plug. Preferably, the plurality of air outlet channels are evenly arranged along the circumference of the plug nose, and the number thereof is 2 to 5. Further, the angle between the centerline of the air outlet channel and the centerline of the plug is 30-60°.

[0022] According to another exemplary embodiment of the present invention, the piercer includes the piercer head device with the above-mentioned structure.

[0023] A method for producing a seamless steel pipe ac...

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Abstract

The invention provides a piercing plug device of a piercer, the piercer and a production method of seamless steel tubes. The piercing plug device of the piercer comprises a piercing plug and a piercing plug bar, a gas transmission pipeline is formed inside the piercing plug and the piercing plug bar, and one or a plurality of gas outlet holes which are communicated with the gas transmission pipeline is formed on the nose portion of the piercing plug. The piercer comprises the piercing plug device of the piercer. The production method of the seamless steel tubes comprises a step of tube blank piercing, and during the step of tube blank piercing, the piercer is used for piercing, and nitrogen or inert gas is lead into the gas transmission pipeline so as to enable the nitrogen or the inert gas to fill between the piercing plug and the a tube blank during piercing. By utilizing the technology of the piercing plug device of the piercer, the piercer and the production method of the seamless steel tubes, the influence of a central tearing cavity on inner surface of a hollow billet is reduced, and the inner surface quality of the hollow billet which is subjected to cross rolling piercing is improved.

Description

technical field [0001] The present invention relates to the field of seamless steel pipe manufacturing, more specifically, to a piercer plug device, a piercer in seamless steel pipe production equipment, and the use of equipment including the piercer plug device and the piercer of the present invention to process seamless steel pipes. method of production. Background technique [0002] When cross-rolling and piercing, the stress-strain characteristics of cross-rolling are mainly used to make the center of the tube billet form a loose phenomenon that is conducive to piercing before encountering the plug, so that the deformation resistance when encountering the plug is greatly reduced, and the plug takes advantage of the gap. Achieve piercing. However, if the process parameters of the piercing machine are unreasonable or the original tube blank has serious central shrinkage or cracks, it may cause the central tissue to loosen too much before it meets the plug, and develop int...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B25/00B21B19/04
Inventor 陈雨郭元蓉杨其光邹友富江健
Owner PANGANG GROUP CHENGDU STEEL & VANADIUM
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