JPH06168779A - Induction heating coil for diffused junction - Google Patents

Abstract

PURPOSE:To enable uniform heating to be made and prevent deformation and damage of a heating coil, while allowing an easy mounting and demounting of the heating coil on and from jointed materials, and preventing the oxidation thereof. CONSTITUTION:Coil bodies 11a and 11b are so constituted as to be freely opened and closed, with hinge sections 12a and 12b formed on the end of one of the two bodies 11a and 11b as a pair. Also, a cylindrical device 13 is mounted on an end of another. The hinge sections 12a and 12b are closely fitted with a power feed terminal 19. The bodies 11a and 11b are made of a stainless steel material 11d having a groove 11c on the internal surface thereof, and a copper plate 11e is integrated therewith. The internal surface of the bodies 11a and 11b is formed to be elliptical with a minor axis intersecting the hinge sections 12a and 12b. Also, the sections 12a and 12b are constituted of a stainless steel material 12d having a groove 12c similar to the bodies 11a and 11b, and a copper plate 12e fastened thereto at the side adjacent to the bodies 11a and 11b. Furthermore, a gas blow chamber 16 is laid at both sides of the bodies 11a and 11b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an induction heating coil for use in a device for diffusion-bonding strips such as reinforcing bars, pipes and steel bars on site work at a construction site.

[0002]

2. Description of the Related Art In recent years, as a method of joining strips such as reinforcing bars, pipes, and steel bars on site, it is possible to easily obtain excellent welding quality and to use diffusion joining with good construction efficiency. (For example, Japanese Patent Laid-Open No. 62-9778).
No. 4, JP-A-2-241677, etc.).

In this diffusion bonding apparatus, the induction heating coil 1 for heating the butted portion of the pipe P is made of copper and has a two-part heating coil 2 having an internal water cooling structure, as shown in FIG.
And a high-frequency transformer 4 that applies a high-frequency current to the heating coil 2 via a coil lead 3 by an applied current, and has a two-divided upper and lower structure, and the two divided parts are fastened with bolts 5. It was a stationary type that integrated as one.

[0004]

However, the above-mentioned stationary induction heating coil has the following problems. Although it is a split type, it does not have a heating coil opening / closing mechanism, so it is difficult to attach / detach to / from the material to be joined. When a hollow material to be joined such as a pipe is heated, the temperature in the vicinity of the power feeding part and the dividing part becomes lower than other parts, so
It is difficult to uniformly heat the materials to be joined. This tendency becomes more remarkable as the thickness of the material to be joined becomes thinner, which causes a problem in quality. Since the heating coil is generally made of copper in consideration of conductivity, the heating coil has low strength and rigidity, and when a large alternating current is applied, mechanical heating is also applied, so that the heating coil is easily deformed. Since there is no shield mechanism, oxidation of the joint is remarkable,
Mechanical properties deteriorate. If shielded,
Since the joint portion is covered with the heating coil, it becomes impossible to measure the temperature, and it becomes impossible to confirm whether or not uniform heating is possible.

The present invention has been made in view of the above problems, and an object thereof is to provide an induction heating coil for diffusion bonding, which can solve all the above-mentioned drawbacks of the conventional induction heating coil.

[0006]

In order to achieve the above-mentioned object, the induction heating coil for diffusion bonding of the present invention comprises two pairs, and one end of each pair is provided with a hinge portion. A coil body that can be opened and closed, and a cylinder at the other end of one coil body, and the other of the other coil body that are paired to open and close the coil body when attaching and detaching to the joined materials. It is composed of a cylinder device in which rods are pivotally attached to the ends, respectively, and a power supply terminal closely attached to the hinge part for supplying a high frequency current to the coil body, and the coil body is cooled on the inner peripheral side thereof. It is composed of a non-magnetic member having a required rigidity provided with a groove serving as a water passage, and a copper plate integrally fixed to the inner peripheral side of the member, and the inner peripheral shape is a hinge. This is the diameter through the part The hinge has an elliptical shape shorter than the diameter in the perpendicular direction, and the hinge is fixed to the non-magnetic member having the same rigidity as that of the coil body and having the required rigidity, and the side of the member that contacts the coil body. It is configured with a copper plate, and further, gas ejection chambers for keeping the coil main body in a non-oxidized state are installed on both sides of the coil main body.

[0007]

The diffusion heating induction heating coil according to the present invention is provided with a hinge portion at one end of each of the paired coil bodies so as to be openable and closable, and can be mechanically opened and closed by a cylinder device. Therefore, it is easy to attach and detach to and from the materials to be joined. Further, since the coil body is composed of a non-magnetic member having a required rigidity and a copper plate fixed to the inner peripheral side of the member so as to be integrated with the member, the coil body has high strength and rigidity, and AC When a large current is applied, it does not easily deform even if mechanical vibration is applied. Further, the inner peripheral shape of the coil body has an elliptical shape in which the diameter passing through the hinge portion is shorter than the diameter in the direction perpendicular to the hinge portion, and the hinge portion is configured in the same manner as the coil body. The material can be heated uniformly. Furthermore, since the gas ejection chambers for keeping the coil body part in the non-oxidized state are installed on both sides of the coil body, the joint portion is not oxidized and the mechanical properties are not deteriorated.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to one embodiment shown in FIGS. FIG. 1 is a front view of an induction heating coil for diffusion bonding of the present invention, and FIG. 2 is a drawing of one coil body,
(A) is a front view, (b) is a side view, FIG. 3 is a drawing of the other coil body, (a) is a front view, (b) is a side view, and FIG.
Is a detailed view of a coil cross section, (a) is a front view, (b) is an arrow BB view of (a), and (a) of FIG. 5 is a cross-sectional view of a hinge portion provided on the other coil body. , (B) is a side view of (a), FIG. 6 is an explanatory view of a temperature measuring hole portion provided in the coil body, and FIG. 7 is an explanatory view of gas ejection chambers provided on both sides of the coil body.

1 to 7, 11a is one coil body and 11b is the other coil body.
As shown in FIG. 4, each pair forms a non-magnetic member having a groove 11c on the inner peripheral side thereof and having a required rigidity, such as a stainless material 11d and a stainless material 11d. A copper plate 11 fixed to the peripheral side by brazing, for example, so as to cover the groove 11c and form a passage for cooling water.
e and.

Then, the coil bodies 11a and 11b
Are provided with hinges 12a and 12b at their one ends, respectively, and can be opened and closed with the hinges 12a and 12b as fulcrums. These hinge parts 12a.1
Similarly to the coil bodies 11a and 11b, 2b is a non-magnetic member having a required rigidity, for example, a stainless material 12d having a groove 12c on the inner peripheral side thereof, as shown in FIG.
On the side of the stainless material 12d that contacts the coil bodies 11a and 11b, a copper plate 12e fixed by brazing, for example, is provided so as to cover the groove 12c and serve as a passage for cooling water.

At the other end of the coil bodies 11a and 11b, a cylinder device 13 is provided for opening and closing the coil bodies 11a and 11b, for example, when the coil bodies 11a and 11b are attached to and detached from the pipe P. That is, one coil body 1
A cylinder is pivotally supported at the other end of 1a and a rod is pivotally supported at the other end of the other coil body 11b.
By moving the rod 3 back and forth, the paired coil bodies 11a and 11b are opened and closed with the hinge portions 12a and 12b as fulcrums. And the coil body 1
The contact portions of the other ends of 1a and 11b are shown in FIG.
As shown in FIG. 3, a convex portion 14a and a concave portion 14b made of, for example, silver-plated copper are provided on the inner side thereof, respectively, for positioning at the time of closing operation and for both coil main bodies 11a and 11a.
It is easy to energize between b. The shaft 13a pivotally supporting the rod is connected to a clamp mechanism (not shown) which constitutes a diffusion bonding device, and the coil main body 11a.
The tube P is clamped and opened in synchronization with the opening and closing of 11b.

Further, the coil main bodies 11a.1 forming the pair
1b has an inner peripheral shape of the hinge portion 12a.1 when the closing operation is performed.
It is formed to have an elliptical shape in which the diameter passing through 2b is shorter than the diameter in the direction perpendicular thereto. That is, the gap between the hinge portions 12a and 12b and the pipe P is made smaller than the gap between the other portions and the pipe P.

Further, as shown in FIG. 6, temperature measuring holes 15 are formed at appropriate places (two places in this embodiment) of the coil bodies 11a and 11b, and these temperature measuring holes 15 are radiated, for example. A thermometer can be installed to constantly measure the temperature of the joint, which greatly affects the quality of the joint.

Reference numeral 16 denotes a coil body 1 as shown in FIG.
A gas ejection chamber having ejection holes 16a insulated from 1a and 11b. The gas ejection chambers are arranged on both sides of the coil bodies 11a and 11b and are made of a non-magnetic material such as copper which is not easily subjected to induction heating. In the present embodiment, the gas injection chamber 16 is provided with a seal member 17 and a seal retainer plate 18 by means of a plurality of stud bolts 11f projectingly provided on a stainless material 11d forming the coil bodies 11a and 11b.
What is attached to the coil main bodies 11a and 11b via. Since the sealing material 17 is in contact with the high temperature portion, it is desirable that the sealing material 17 is made of, for example, alumina fiber having heat resistance. Further, the seal pressing plate 18 is for preventing deformation and damage of the local terminal of the seal material 17, and if the gap with the pipe P is 1 to 2 mm, the sealing property is also improved.

Reference numeral 19 denotes a power supply terminal for supplying a high frequency current to the coil bodies 11a and 11b. As shown in FIG. 7, the hinge portions 12a and 12b are in close contact with the hinge portions 12a and 12b at all times via a spring 20 at a constant pressure. It is mounted so that the coil bodies 11a and 11b can be opened and closed without impairing the electrical conductivity.

The induction heating coil for diffusion bonding of the present invention has the structure as described above, and after the induction heating coil of the present invention is positioned at the bonding portion of the pipe P to be bonded, the clamp mechanism of the bonding device is set. If activated, the cylinder device 13
The rod is moved out and the coil bodies 11a and 11b are changed from the open state to the closed state and can be attached to the pipe P.

In this state, if a high frequency current is applied to the coil bodies 11a and 11b via the power supply terminal 19, the high frequency current will flow through the hinge portions 12a and 12b to the coil bodies 11a and 11b, and the coil body 11a and 11b. Heat 11b. At this time, in the present invention, the copper plates 11e and 12e are electric paths, and the current flows on the surface of the copper plates 11e and 12e. Therefore, it is not necessary to make the thickness of the copper plates 11e and 12e thicker than necessary, and the current penetration depth It may be about 2.2 times.

Although the joint portion of the pipe P is heated by the heat generation of the coil main bodies 11a and 11b described above, in the present invention, when the coil main bodies 11a and 11b are closed, the inner peripheral shape is the hinge portions 12a and 12b. Since the passing diameter is formed to have an elliptical shape shorter than the diameter in the direction perpendicular to this, the tube P can be heated uniformly.

Further, since the inert gas is ejected from the chamber 16 to the periphery of the joint when the above-mentioned pipe P is heated,
Oxidation of the joint can be prevented.

[0020]

As described above, according to the present invention,
Since the two coil bodies forming a pair are configured to be openable and closable and can be mechanically opened and closed by the cylinder device, the materials to be joined can be easily attached and detached, and the joining time can be shortened. Also, the coil body is made up of a non-magnetic member having the required rigidity and a copper plate that is integrally fixed to the inner peripheral side of this member, so the strength and rigidity are greatly improved. However, deformation and damage due to collision and interference with the materials to be joined can be greatly reduced. Further, the inner peripheral shape of the coil body is formed into an elliptical shape whose diameter passing through the hinge portion is shorter than the diameter in the direction perpendicular to the hinge portion, and the hinge portion is a non-magnetic material having the required rigidity, like the coil body. Since it is composed of the member and the copper plate, it is possible to prevent a temperature drop immediately below the hinge portion and to uniformly heat the joined materials. Furthermore, since the gas ejection chambers for keeping the coil body part in the non-oxidized state are installed on both sides of the coil body, the joint portion is not oxidized and the mechanical properties are not deteriorated.

[Brief description of drawings]

FIG. 1 is a front view of an induction heating coil for diffusion bonding of the present invention.

FIG. 2 is a drawing of one coil body, (a) is a front view,
(B) is a side view.

FIG. 3 is a drawing of the other coil body, in which (a) is a front view,
(B) is a side view.

FIG. 4 is a detailed view of a coil cross section, (a) is a front view,
(B) is a BB view of FIG.

5A is a cross-sectional view of a hinge portion provided on the other coil body, and FIG. 5B is a side view of FIG.

FIG. 6 is an explanatory diagram of a temperature measuring hole portion provided in the coil body.

FIG. 7 is an explanatory diagram of gas ejection chambers provided on both sides of the coil body.

FIG. 8 is a front view showing an example of a conventional induction heating coil for diffusion bonding.

[Explanation of symbols]

 11a One coil main body 11b Other coil main body 11c Groove 11d Stainless steel material 11e Copper plate 12a One hinge part 12b Other hinge part 12c Groove 12d Stainless steel material 12e Copper plate 13 Cylinder device 16 Gas ejection chamber 19 Power supply terminal

Front page continuation (72) Inventor Chiaki Sasaki 4-5-3 Kitahama, Chuo-ku, Osaka City, Osaka Prefecture Sumitomo Metal Industries Co., Ltd. No. 3 Daiichi Kogyo Kogyo Co., Ltd. (72) Inventor Osamu Mochizuki 2-3-8 Tonomachi, Kawasaki-ku, Kawasaki-shi, Kanagawa Dai-ichi Kogyo Kogyo Co., Ltd.

Claims (1)

[Claims] 1. A coil body which is formed by pairing two pieces, and a hinge portion is provided at each one end portion of the pair so as to be openable and closable, and opening and closing of the coil body at the time of attaching and detaching to a joined material in a butted state. A cylinder device in which a cylinder is pivotally attached to the other end of one coil body and a rod is pivotally attached to the other end of the other coil body for operation, and a coil device for supplying a high frequency current to the coil body is provided. The coil main body comprises a power supply terminal closely attached to the hinge portion, and the coil body has a non-magnetic member having a required rigidity in which a groove serving as a cooling water passage is provided on the inner peripheral side thereof, and the inside of this member. It is composed of a copper plate fixed to the peripheral side so as to be integrated with it, and its inner peripheral shape has an elliptical shape in which the diameter passing through the hinge part is shorter than the diameter in the direction perpendicular to this, and the hinge part Is the same groove as the coil body A non-magnetic member having a required rigidity provided and a copper plate fixed to the side of the member that contacts the coil body. Further, both sides of the coil body are provided for keeping the coil body portion in an unoxidized state. An induction heating coil for diffusion bonding, which is provided with a gas ejection chamber.