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Method of processing end of elongated tube material

A processing method and pipe technology, which can be used in metal processing, metal processing equipment, metal processing machinery parts, etc., can solve the problem of residual oxide scale on the thread part, and achieve the effect of good processing accuracy.

Inactive Publication Date: 2010-03-24
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, no matter how good the centering accuracy is, scale may remain on the processed complete thread due to the bending of the pipe end side.

Method used

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  • Method of processing end of elongated tube material
  • Method of processing end of elongated tube material
  • Method of processing end of elongated tube material

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Embodiment Construction

[0031] Next, based on the description of the general jig of the non-floating method figure 1 and description of the floating fixture figure 2 The process of obtaining the present invention and the preferred mode of the present invention will be described.

[0032] The inventors studied the cause of the problem that even when the centering accuracy is improved by using a floating jig device in the case of performing thread cutting on a longitudinally long pipe material, specifically, an end portion of an oil well pipe, sometimes Scale may also remain on intact threads.

[0033] The reason why the scale remains in the complete thread part is: the vibration caused by the bending of the end side of the long pipe material, and the holding part of the pipe material held by the clamp device when the thread is cut is deformed into an ellipse due to the holding pressure shape. The scale part caused by the bending of the end side is generated on the pipe end face side of the intact...

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Abstract

Thread cutting of the end portion of a long tubular member (1) held by a chuck system (3) is carried out with high accuracy without leaving mill scale on the complete thread portion of the resulting threads. The protruding length L of the long tubular member from the chuck system (3) to the end face of the tubular member is controlled so that the ratio L / D of the protruding length L to the outer diameter D of the long tubular member (1) is in a range predetermined depending on the outer diameter D and the ratio t / D of the wall thickness t to the outer diameter D of the tubular member (1). Whenthe chuck system is a floating chuck system having a floating chuck and a positioning chuck, the protruding length L of the tubular member from the floating chuck and the protruding length L' thereoffrom the positioning chuck are controlled.

Description

technical field [0001] The present invention relates to a method for machining the end of a long pipe held by a jig device, which is suitable for cutting and machining a joint with high precision, for example, at the end of an oil country tubular good with or without a metal-to-metal (Metal to Metal) seal thread used. The jig device used may be a non-floating general jig device or a floating jig device provided with a floating jig. Background technique [0002] As far as the oil well pipes used in the drilling of oil wells and gas wells and the production of crude oil and natural gas are connected by couplings during use, threads for joints (generally, tapered threads) are formed at the ends of the pipes. ). This thread is required to be highly airtight. Therefore, if image 3 As shown, when cutting the thread at the end of the oil country tubular goods 1, high machining accuracy is required, that is, it is not allowed to leave uncut mill scale 1b on the complete thread p...

Claims

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Application Information

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IPC IPC(8): B23B1/00B23B5/00B23B5/16B23B31/02
CPCB23G1/52B23B31/16B23B2270/12B23G1/22B23Q3/183B23B2231/22
Inventor 石井和宏
Owner NIPPON STEEL CORP