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Apparatus for pipe end sizing and method for pipe end sizing

A metal pipe and equipment technology, which is applied in the field of metal pipe end correction equipment and metal pipe end correction, can solve the problems of poor inner diameter dimensional accuracy, and achieve the effect of excellent dimensional accuracy

Inactive Publication Date: 2012-06-20
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This deformation degrades the dimensional accuracy of the inner diameter of the end of the metal pipe (the end to be expanded)

Method used

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  • Apparatus for pipe end sizing and method for pipe end sizing
  • Apparatus for pipe end sizing and method for pipe end sizing
  • Apparatus for pipe end sizing and method for pipe end sizing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] In order to confirm the effect of the present invention, the figure 1 The illustrated plug was inserted into a pipe end of a seamless steel pipe made of carbon steel to expand the pipe, and the ellipticity of the inner diameter of the expanded metal pipe was investigated. Table 1 shows the outer diameter, wall thickness, plug shape, clamping position, and inner diameter ellipticity of the metal pipe used in the experiment.

[0078] In addition, the shape of the inner surface of the expanded pipe was measured with a shape measuring machine, and the ellipticity of the inner diameter was calculated by the following formula. Among them, d in the formula max Indicates the maximum inner diameter, d min Indicates the minimum inner diameter, d ave Indicates the average inner diameter.

[0079] Inner diameter ellipticity (%) = (d max -d min ) / d ave ×100

[0080] Table 1

[0081]

[0082] According to the results shown in Table 1, the inner diameter ellipticity and...

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PUM

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Abstract

An apparatus for sizing a pipe end comprising: a plug 3 for sizing the pipe end; a chuck 2 for clamping the pipe; and shifting means for shifting the position of the plug 3 and / the chuck 2, which are placed successively from the end of the pipe 2, and the plug 3 has a circular cross section, and is constituted by a taper portion 31 and a diameter equivalent portion 32 continuously formed from the tip of the plug in succession. The outer diameter of the taper portion 31 is gradually expanding from the tip toward the rear end while satisfying the following formulas (1) and (2). The chuck 2 is capable of changing clamping position of the pipe 1. This apparatus makes it possible to size the inner diameter of a pipe end with superior dimensional precision. 22<=LR / ( D1*0.01 / 2 )<=115 (1); and R2<=R1 (2).

Description

technical field [0001] The present invention relates to an apparatus and method for correcting the inner diameter size of the end portion of a metal pipe including a seamless pipe or a welded pipe. Background technique [0002] Line pipes are usually connected to other line pipes by welding on site. Therefore, excellent dimensional accuracy of the pipe ends is required, especially excellent dimensional accuracy of the inner diameter. In addition, oil well pipes are usually connected by threading the ends and fastening them. In this case, excellent dimensional accuracy of the pipe end is also required. [0003] As a method of increasing the inner diameter of the end of the metal pipe, a method of correcting the size while expanding the end of the metal pipe with a diameter expanding device is known. [0004] Figure 4 It is a schematic diagram for explaining the method of correcting the end of a metal pipe using a conventional diameter expanding device. In the previous pip...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21D3/14B21D41/02
CPCB21D41/026B21D39/20B21D3/14B21D41/02
Inventor 奥井达也黑田浩一秋山雅义
Owner NIPPON STEEL CORP