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Apparatus and method for production of tapered steel pipe

A technology for tapered steel pipes and manufacturing devices, applied in the field of tapered steel pipe manufacturing devices

Inactive Publication Date: 2008-02-13
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The present invention solves the conventional problems as described above and provides a tapered steel pipe manufacturing apparatus capable of high-speed manufacturing of high-quality tapered steel pipes with no thin-walled parts, uniform thickness, and no rough surface. of

Method used

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  • Apparatus and method for production of tapered steel pipe
  • Apparatus and method for production of tapered steel pipe
  • Apparatus and method for production of tapered steel pipe

Examples

Experimental program
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Effect test

Embodiment 1

[0071] Using the manufacturing device shown in FIG. 7, an electric resistance welded steel pipe with an outer diameter of 165.2 mm, a wall thickness of 4.5 mm, and a length of 9000 mm was used as a pipe blank, and then processed into a shape that can obtain two tapered steel pipes as shown in FIG. 12 . That is, two tapered steel pipes with a tapered length of 4500 mm, an outer diameter ranging from 134.1 mm to 89.1 mm, and a wall thickness of 4.5 mm can be obtained. In the conventional method in which the peripheral speeds of the steel pipe and the processing roll are not controlled, polygonal cross-section and distortion occur at a high probability of 50% or more. On the other hand, when the manufacturing method of the present invention is used to control the absolute value of the difference Δ between the peripheral speed Vp of the processed part of the steel pipe and the peripheral speed Vr of the processed part of the processing roll, failure occurs under the condition of |Δ...

example 2

[0075] Using the apparatus shown in FIG. 11 , taper processing was performed to reduce the diameter of a steel pipe with an outer diameter of 300 mm to 280 mm at a taper ratio of 3 / 100. It is judged that the most suitable processing temperature of the steel pipe is 700°C, 180°C is selected as the initial value (ideal calculated value) of the temperature drop constant during processing, and the output of the heating device 4 is adjusted so that the temperature of the steel pipe on the output side of the heating device reaches 880°C. Since the measured value of the temperature drop in the later stage of processing reaches 190°C, the stable drop constant is set to 190°C, and the temperature of the steel pipe on the output side of the heating device is increased to 890°C. As a result, the temperature of the steel pipe sent to the processing roll can be controlled within the range of 700°C ± 20°C, enabling tapered processing.

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Abstract

The present invention provides a production system for tapered steel pipe able to produce high quality tapered steel pipe having a uniform thickness without any thin parts and without any orange peel roughness at a high speed, that is, a production system for tapered steel pipe holding the two ends of a steel pipe p at shafts on trolleys, moving the pipe in the axial direction while rotating it, and drawing it to a taper by an intermediate work roll 6 wherein the axis of rotation of the work roll 6 is inclined 20 to 40 degrees with respect to the axis of rotation of the steel pipe P. Further, a face plate 7 covering the work roll 6 can be positioned and supported with respect to a body part 1 by a hinge mechanism 8 and fastened to the body part 1 by screw members 9, a bearing 6b at the side of the work roll 6 close to the steel pipe can be made smaller than a bearing 6c at the side far from the steel pipe, and the two bearings 6b and 6c can coupled by a tie rod 10.

Description

technical field [0001] The present invention relates to an apparatus and method for reducing the diameter (compression processing) of electric welded steel pipes, welded steel pipes, seamless steel pipes, etc. under warm heat, and in particular to tapered steel pipes in which the outer diameter of steel pipes gradually changes along the axial direction Manufacturing device and manufacturing method. Background technique [0002] The outer diameter of the steel pipe gradually changes along the axial direction, and the tapered steel pipe in which the ridge line of the steel pipe is inclined relative to the axis is used as a utility pole for road lighting, etc. Devices for manufacturing such tapered steel pipes by diameter reduction are described in, for example, JP-10-24323, JP-11-197755, JP-2002-192225, JP-2002-292432 and JP-2002 - Publication No. 292433. [0003] The above-mentioned invention is a tapered steel pipe in which both ends of the steel pipe are respectively held...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21D41/04
Inventor 黑田泰行栗山幸久上田学菱田博俊弘重逸朗本吉卓
Owner NIPPON STEEL CORP