KR101507742B1 - Work-coil adapted to high-frequency heat treatment - Google Patents

Abstract

The present invention is characterized in that a small diameter coil is disposed inside a large diameter coil so that the pipe is drawn between the large diameter coil and the small diameter coil so that the outer diameter and the inner diameter of the pipe can be simultaneously high frequency heated, To a work coil for high frequency heat treatment which can be heat-treated.
The workpiece for high frequency heat treatment according to the present invention is characterized in that the insulator 15 is disposed between the first electrode terminal 11 and the second electrode terminal 13 and the first electrode terminal 11 and the second electrode terminal 13, Shaped large-diameter coil 30 is connected to the first connection rods 20 and 22 and the first electrode terminal 11 and the second electrode terminal 11 are connected to the first connection rod 20 and the second connection rod 20, A pair of second connection rods 40 and 42 are connected to the electrode terminal 13 so that the second connection rods 40 and 42 are arranged in parallel with the first connection rods 20 and 22, A small ring-shaped coil 50 is connected to the connection rods 40 and 42, and a small-diameter coil 50 is disposed inside the large-diameter coil 30. [

Description

{WORK-COIL ADAPTED TO HIGH-FREQUENCY HEAT TREATMENT}

The present invention is characterized in that a small diameter coil is disposed inside a large diameter coil so that the pipe is drawn between the large diameter coil and the small diameter coil so that the outer diameter and the inner diameter of the pipe can be simultaneously high frequency heated, To a work coil for high frequency heat treatment which can be heat-treated.

Korean Patent No. 10-0724724 (registered on May 28, 2007) discloses a "work coil for high-frequency heat treatment ".

Wherein the high frequency heat treatment work coil comprises: an electrode part composed of a first electrode part and a second electrode part connected to two terminals of a high frequency oscillator; Wherein the first and second terminals are connected to the first electrode unit and the second electrode unit to form the circular coil, A coil part for receiving the high frequency from the high frequency oscillator and heating the workpiece; A plurality of circular cooling coils disposed at one side of the circular coil to perform quenching with respect to the outside of the workpiece that has been heated by the coil portion and passed through the circular coil, An outer cooling part of the cooling device; A connecting portion connecting the circular coil of the coil portion and the outer cooling portion to adjust the gap between the circular coil of the coil portion and the outer cooling portion according to the thickness and radius of the work piece; And a plurality of third cooling water heaters positioned on the same plane with the same central axis as the outer cooling section for performing quenching with respect to the inside of the workpiece that has been heated by the coil section and passed through the circular coil, And a circular inner cooling portion having a length smaller than the radius of the outer cooling portion for ejecting the cooling water through the air outlet, wherein the connection portion includes a connection hole through which the protruded terminal protruding from the surface of the circular coil and the outer cooling portion can be inserted A plurality of connection bars formed at predetermined intervals so as to adjust a spacing between the circular coil and the side cooling part; And a connecting screw for fixing the protruding terminal of the circular coil and the outer cooling part inserted into the connection hole to the connection bar to fix a controlled spacing distance between the circular coil and the outer cooling part.

However, since the high-frequency heat treatment work coils are subjected to high-frequency heating only on the outer circumferential surface of the pipe, a temperature imbalance occurs between the outer circumferential surface and the inner circumferential surface, and the heat treatment is uneven, so that the hardness of the outer circumferential surface and the inner circumferential surface of the pipe is different.

Therefore, it is an object of the present invention to provide a small-diameter coil in which a small-diameter coil is disposed, and the pipe is drawn between the large-diameter coil and the small-diameter coil to simultaneously heat the outer diameter and the inner diameter of the pipe. And to provide a high-frequency heat-treating work coil which can be heat-treated so that the hardness becomes uniform.

According to an aspect of the present invention, there is provided a work coil for high-frequency thermal processing in which an insulator is disposed between a first electrode terminal and a second electrode terminal, and a pair of first connections Shaped large-diameter coil is connected to the first connection rod, a pair of second connection rods are connected to the first electrode terminal and the second electrode terminal, respectively, and the second connection rod is connected to the first connection Diameter small-diameter coil is connected to the second connecting rod, and a small-diameter coil is disposed inside the large-diameter coil.

The first connecting rod and the second connecting rod are characterized in that the length is determined by a spiral fastening section of a pipe to be heat-treated.

As a result, the work coil for high-frequency heat treatment according to the present invention can simultaneously heat the outer diameter and the inner diameter of the pipe at a high frequency, so that the heat treatment can be performed so that the hardness of the outer diameter and the inner diameter of the pipe becomes uniform.

1 is a perspective view showing a work coil for high frequency heat treatment according to the present invention;
2 is a cross-sectional view schematically showing an example in which a pipe is heat-treated by a work coil for high-frequency heat treatment according to the present invention

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

1 and 2, a work coil for high-frequency heat treatment according to the present invention is characterized in that an insulator 15 is disposed between a first electrode terminal 11 and a second electrode terminal 13 and a first electrode terminal 11 Shaped large-diameter coil 30 is connected to the first connection rods 20, 22, and the first connection rods 20, 22 are connected to the second electrode terminals 13, A pair of second connection rods 40 and 42 are connected to the first electrode terminal 11 and the second electrode terminal 13 so that the second connection rods 40 and 42 are connected to the first connection rods 20 and 22 Diameter small-diameter coil 50 is connected to the second connection rods 40 and 42, and the small-diameter coil 50 is disposed inside the large-diameter coil 30. The small-

The first connection rods 20 and 22 and the second connection rods 40 and 42 are determined by the length L1 of the spiral fastening section 62 of the pipe 60 to be heat treated.

The work coil for high-frequency heat treatment according to the present invention configured as described above is for performing high-frequency heat treatment on the spiral fastening section 62 formed at the end of the pipe 60. The work coil includes a large diameter work coil 30 and a small diameter work coil 50, The pipe 60 is pulled in the direction of the arrow 65 between the large diameter workpiece coil 30 and the small diameter workpiece coil 500 so that the large diameter workpiece coil 30 The inner peripheral surface of the pipe 60 is subjected to high-frequency heating by the small-diameter work coil 50. At the same time,

At this time, due to the length L1 of the first connection rods 20, 22 and the second connection rods 40, 42, the pipe 60 is connected to the large diameter work coil 30 and the small- The cooling water injection nozzles 70 and 75 simultaneously inject the cooling water to the outer peripheral surface and the inner peripheral surface of the heated pipe 60.

Thus, the work coil for high-frequency heat treatment according to the present invention can uniformly and high-frequency heat the inner circumferential surface of the pipe on which the female screw is formed and the outer circumferential surface of the pipe on which the male screw is formed and a thermal gradient (temperature imbalance) is generated between the outer circumferential surface and the inner circumferential surface The heat treatment can be performed so that the hardness of the outer peripheral surface of the pipe and the hardness of the inner peripheral surface are the same.

11: first electrode terminal 13: second electrode terminal
20, 22: first connection rod 30: large diameter coil
40, 42: second connection rod 50: small diameter coil

Claims (2)

An insulator 15 is disposed between the first electrode terminal 11 and the second electrode terminal 13 and a pair of first connection rods 20 is provided on the first electrode terminal 11 and the second electrode terminal 13, Shaped large-diameter coil 30 is connected to the first connection rods 20 and 22 and the pair of electrodes 22 and 22 are connected to the first electrode terminal 11 and the second electrode terminal 13, The second connection rods 40 and 42 are arranged parallel to the first connection rods 20 and 22 and the second connection rods 40 and 42 are connected to the second connection rods 40 and 42 in a ring shape Diameter coil (50) is connected to the large-diameter coil (30), and a small-diameter coil (50) is disposed inside the large-diameter coil (30).
The method according to claim 1,
Characterized in that the length L1 of the first connection rods 20 and 22 and the second connection rods 40 and 42 is determined by the spiral fastening section L2 of the pipe 60 to be heat treated. Work coil for.

Images