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Method and apparatus for heat treatment of pipes

A heat treatment method and technology of a heat treatment device, applied in heat treatment furnaces, heat treatment equipment, induction heating devices, etc., can solve problems such as temperature unevenness, achieve the effect of improving blocking performance and durability

Active Publication Date: 2016-12-21
MITSUBISHI POWER LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In addition, in the heat treatment of pipes arranged in the horizontal direction, since the heated high-temperature air in the pipes moves upwards and the surrounding normal-temperature air flows in downwards, temperature unevenness tends to occur.

Method used

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  • Method and apparatus for heat treatment of pipes
  • Method and apparatus for heat treatment of pipes
  • Method and apparatus for heat treatment of pipes

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Embodiment Construction

[0092] Hereinafter, some embodiments of the present invention will be described with reference to the drawings. However, dimensions, materials, shapes, relative arrangements, and the like of components described as embodiments or shown in the drawings are not intended to limit the scope of the present invention, but are merely illustrative examples.

[0093] For example, for expressions such as "in a certain direction", "along a certain direction", "parallel", "orthogonal", "center", "concentric" or "coaxial", etc. indicating relative or absolute configurations, strict In other words, it means not only such an arrangement but also a state of relative displacement with a tolerance or an angle and a distance to the extent that the same function can be obtained.

[0094] For example, expressions such as "same", "equal" and "homogeneous" indicating an equal state of an object strictly mean not only an equal state, but also a state where there are tolerances or differences to the e...

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Abstract

The present invention involves a first step of inserting into a pipe, through at least one inspection hole formed in the pipe, at least one expansion element composed of a flexible material and capable of expanding upon being supplied with an expansion fluid, and positioning the expansion element on at least one side of a heat treatment region of the pipe; a second step of supplying an expansion fluid to the expansion element through a flexible supply tube inserted into the pipe from an inspection hole formed in the pipe, and blocking the inside of the pipe with the expanded expansion element on at least one side of the heat treatment region; and a third step in which, with the interior of the tube blocked by the expansion element, electricity is supplied to an RF induction heating coil provided around the heat treatment region of the pipe, so as to subject the heat treatment region of the pipe to a heat treatment.

Description

technical field [0001] The present invention relates to a heat treatment method for heat-treating piping using a high-frequency induction heating method, and an apparatus used in the heat treatment method. Background technique [0002] When an alternating current flows through the coil arranged around the object to be heated, a magnetic field is generated around the coil, and in the magnetic field changed by the alternating current, a high density is generated near the surface of the object to be heated due to electromagnetic induction the eddy current. The surface of the object to be heated is heated by the Joule heat of the eddy current. The high-frequency induction heating method utilizes this heating principle. [0003] Conventionally, heat treatment of piping (for example, heat treatment such as quenching and annealing) using a high-frequency induction heating method has been known. For example, Patent Document 1 discloses an apparatus for heat-treating a piping syst...

Claims

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Application Information

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IPC IPC(8): C21D9/08C21D1/42C21D9/00H05B6/10
CPCC21D9/00C21D9/08C21D1/42H05B6/10Y02P10/25C21D9/50
Inventor 川水努金卷裕一大久保宏树美坂英一吉田年宏高桥弘照石崎浩司
Owner MITSUBISHI POWER LTD
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