JPH03107422A - Method for aligning pipe to be heated with respect to induction heating coil - Google Patents

Abstract

PURPOSE:To carry out heat treatment for a pipe to be heated under strict temp. control by clamping the pipe to be heated inserted into an induction heating coil by means of a clamping device, moving the clamping device according to the eccentricity of the pipe to be heated with respect to the coil, and aligning the pipe to be heated with respect to the coil. CONSTITUTION:An induction heating coil 10 is moved forward toward a drill pipe 1 formed by welding a joint 3 with pressure to a pipe body 2 in a pressure weld zone 4 and is aligned with respect to the pressure weld zone 4 of the pipe 1, and the pipe 1 at the position near to the pressure weld zone 4 is clamped by means of a clamping device 13. In this state, distances to the surface of the pressure weld zone 4 are measured by means of plural noncontact-type sensors 12 at equal distances from the center of the coil 10. The amount of eccentricity is operated based on the measured signals by means of a control device 14, and the clamping device 13 is moved vertically and laterally according to the operated result, and then, the pressure weld zone 4 is aligned with respect to the coil 10. By this method, a clearance between the pressure weld zone 4 and the coil 10 can be held constant and strict heat treatment can be performed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for aligning a tube to be heated with an induction heating coil.

[Prior Art] Conventionally, induction heating coils have been used to perform heat treatment on, for example, press-welded parts of drill pipes.
To make the gap constant, it is necessary to center each wire during heat treatment.

[Problems to be Solved] However, in order to perform a large amount of heat treatment in a short period of time, it is impossible to take out the cores one by one. For this reason, a temperature difference occurs in the circumferential direction of the press-welded portion, making it impossible to perform heat treatment with strict temperature control.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for aligning a tube to be heated with an induction heating coil, which can solve the above-mentioned problems.

[Means for Solving the Problems] The method of aligning the heated tube to the induction heating coil of the present invention is as follows:
The amount of eccentricity between the tube to be heated, which is clamped and inserted into the induction heating coil by a clamping device, with respect to the coil is measured, and the clamping device is moved vertically and horizontally in accordance with the measured amount of eccentricity. This is characterized in that the tube to be heated is aligned with the induction coil.

[Operation] Measure the eccentricity of the heated tube clamped and inserted into the induction heating coil by the clamp device, and move the above-mentioned lamp device vertically and horizontally in accordance with the measured eccentricity. By moving the heating tube, the heated tube can be aligned with the induction coil.

In this way, heat treatment with strict temperature control can be performed.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings regarding a case where a press-welded portion of a drill pipe is heat treated.

The drill pipe 1 is formed by pressing a joint part 3 onto a pipe body 2 at a pressure contact part 4. The induction heating coil 10 is
It is attached to a pedestal 11 that is driven to move horizontally in the figure. A plurality of non-contact distance sensors 12 are arranged at equal distances from the center of the coil 10 to measure the eccentricity of the inserted pressure contact portion 4 with respect to the coil.

A clamping device 13 for the drill pipe 1 is attached to a trolley 15, and a control device 14 adjusts the position of the clamping device vertically and horizontally.
provided through. This control device 14 calculates signals from the plurality of distance sensors 12 described above and aligns the pressure contact portion 4 of the drill pipe with the coil 10.

Then, the heating coil 10 is advanced toward the drill pipe 1 placed on a table (not shown), and is brought into alignment with the pressure contact portion 4 . Then, the drill pipe 1 is clamped by the clamp device 13 at a location close to the pressure contact portion 4. In this state, the distance to the surface of the pressure contact portion 4 is measured by the distance sensor 12.

The control device 14 calculates the amount of eccentricity based on this measurement signal, moves the clamp device 13 based on the calculation result,
The pressure contact portion 4 is aligned with the coil 10.

In this way, the heat treatment is performed while keeping the gap between the pressure welding part 4 and the induction heating coil 10 constant.

[Effects of the Invention] The method of aligning the heated tube to the induction heating coil according to the present invention as described above prevents the deviation of the heated tube that is clamped and inserted into the induction heating coil by the clamping device. By measuring the core amount and moving the clamp device vertically and horizontally in accordance with the measured eccentricity, the heated tube can be aligned with the induction coil.

In this way, heat treatment with strict temperature control can be performed.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing an example of equipment for carrying out the method of the present invention.

Claims (1)

[Claims] The amount of eccentricity between the tube to be heated, which is clamped and inserted into the induction heating coil by a clamping device, with respect to the coil is measured, and the clamping device is moved vertically and horizontally in accordance with the measured amount of eccentricity. A method for aligning a tube to be heated with an induction heating coil, the method comprising aligning the tube to be heated with the induction coil.