JP2001035646A - Induction heating joining device and joining method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely join with small power energy in a short time and enhance safety by installing a C-type inductor together with a C-shaped core capable of inserting a junction of a joining material such as a pipe material or a rod material into an opening, supplying high frequency current to a coil conductor coiled in the vicinity of the opening to generate a high frequency magnetic flux inside the core, and heating the vicinity of the junction. SOLUTION: Pipe materials 1, 1 arranged in an opening 51a of a core 51 of a C-type inductor 50 are heated and joined with high frequency current supplied from a power source to a coil conductor 52. Since a device is lightweight, small, and easy to handle, working efficiency is enhanced. Since the C-type conductor 50 and the pipe material 1 are kept in a non-contact state, contact failure or an electric shock is prevented. Preferably, the core 51 is made of a ferrite core of a ferromagnetic material and magnetic flux generating efficiency is enhanced, heating efficiency in the junction is enhanced, high frequency current is decreased, apply to the coil conductor 52 of a litz wire in which strands are individually insulated is made possible, and since temperature rising of the device is made low, natural cooling can be applied.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an induction heating joining apparatus and a joining method used for joining metal or non-metallic pipes and joining metal rods.

[0002]

2. Description of the Related Art The following means have conventionally been provided as means for joining a pipe made of a non-metal such as metal or synthetic resin.

(1) Joining of non-metallic tubing used for prefabricated aggregates etc. Diameter 10 mm to 30 mm used as prefabricated aggregates
As shown in FIG. 4, when joining pipe members made of an insulating material such as a plastic material to a certain extent, as shown in FIG. After wrapping and arranging the joint portion 1a, a high-frequency magnetic field is applied from the outside 4 of the insulating socket 3 to heat the metal sleeve 2, and the heat of the metal sleeve 2 at a high temperature causes the tube material 1, 1 to be heated. And the insulating socket 3 are welded.

(2) Joining of metal tubing used for hydraulic piping and the like FIG. 7 shows the joining of pipes made of a metal material having a diameter of about 10 mm to 50 mm and used for hydraulic piping and the like.
As shown in FIG. 7, silver braze 07 is mounted in grooves provided at two locations on the inner periphery of metal socket 6 to join pipe members 7 and 7 to each other.
The metal socket 6 is heated and heated by applying a high-frequency magnetic field from the outside 8 of the metal socket 6.

[0005] Then, the silver solder 07 is melted by the heat of the metal socket 6 which has become high temperature, and the inner circumference of the metal socket 6 and the outer circumference of the pipes 7, 7 are fixed by the silver solder 07,
The pipe members 7 are joined to each other so as to have a strength capable of sealing the internal and external pressures of the pipe member 7 at the fixing portion.

(3) Joining of pipe and nipple made of dissimilar metals As shown in FIG. 12, when joining a nipple and a pipe made of different metal materials, a nipple 10 is used.
The nipple 10 and the end face of the pipe 9 inserted into the inner circumference of
A silver solder 1 attached to a premises provided on the inner periphery of the nipple 10
1 are joined by heating and melting.

As a high-frequency heating and joining apparatus for performing high-frequency heating and joining of a metal pipe or a nonmetallic pipe as described in the above (1) to (3), a conventional heating apparatus using a solenoid type coil as shown in FIG. A joining device is used.

In FIG. 11A, a solenoid type coil 12 is wound one or more turns so as to include a metal sleeve or a metal tube material 01 therein, and a high-frequency coil current 14 flows through a power supply 13. Thereby, the magnetic flux 15 is generated in the axial direction of the metal sleeve or the metal tube material 01. When the high-frequency magnetic flux 15 acts in the axial direction of the metal sleeve or the metal tube material 01, an eddy current 16 is induced along the outer periphery thereof, as shown in FIG.
1 is heated.

[0009]

However, the conventional heat bonding apparatus shown in FIG. 11 has the following problems to be solved.

(1) In order to use the solenoid type coil 12, when arranging it so as to include the sleeve or the tube material, the turns are opened electrically and mechanically to wind the tube material into the coil coil current. It is necessary to make the opening part electrically good contact state when flowing. In order to cope with this, there is an example in which the electrical and mechanical opening of the solenoid coil conductor is conventionally performed by a connection method using bolts, but such a method has extremely low work efficiency.

(2) As an improvement of the above-mentioned method, a method in which an electric contactor (connector) is used instead of a bolt to electrically and mechanically open and connect with one touch is disclosed in Japanese Patent Laid-Open No. In this system, the structure of the contactor is complicated, and the electrical joint of the contactor must be exposed, so that the joining of the tubing is mainly performed. If the location is not good, or outdoors in rainy weather, there is a risk of poor contact or electric shock of the worker.

(3) The outside of the solenoid type coil 12 is
Since it is in the atmosphere, the magnetic resistance to the magnetomotive force (current × number of turns) of the coil is large, and the magnetic flux generation efficiency is low.

In view of the above-mentioned problems of the prior art, the present invention is capable of reliably joining objects to be joined in a short time with a small amount of power energy, improving work efficiency, and performing joining work in a safe state. It is an object of the present invention to provide an induction heating bonding apparatus and a bonding method that can be obtained.

[0014]

According to the present invention, there is provided a heating and joining apparatus for joining objects such as pipes and bars by heating. A C-shaped inductor having a core formed and capable of inserting a joint of the joint into the opening, and a coil conductor wound around the opening of the core near the opening and through which a high-frequency current flows. The C-type inductor is configured to heat a vicinity of a joint of the joint by applying a high-frequency current to the coil conductor to generate a high-frequency magnetic flux inside the iron core. We propose an induction heating joining device.

[0015] In this invention, claim 2 is preferable.
As described, the iron core is constituted by a ferrite core, and the coil conductor is constituted by a litz wire in which strands are individually insulated.

According to a third aspect of the present invention, in the first aspect, the present invention relates to an induction heating joining apparatus for joining an object requiring a particularly large coil current, wherein the coil conductor is made of a pipe such as a copper pipe. The coil conductor itself and an iron core portion near the coil conductor are cooled by allowing a cooling liquid to flow through the inside of the tubular body.

The inventions according to claims 4 to 8 relate to the invention of a method using the induction heating joining apparatus according to the inventions according to claims 1 to 3, and the invention according to claim 4 relates to a tube material and a rod material. In joining objects such as by heating,
A C-shaped inductor formed by winding a coil conductor around the outer periphery of a C-shaped iron core is disposed so that the joint of the article is located in the opening thereof, and a high-frequency current is applied to the coil conductor. To generate a high-frequency magnetic flux inside the iron core, and heat the vicinity of the joint of the article to be joined by eddy current generated by the magnetic flux.

The invention according to claims 5 to 8 relates to a concrete method of the invention according to claim 4, wherein the invention according to claim 5 is a method according to claim 4, wherein the article to be joined is a non-metallic tube. A metal sleeve is wound around the outer periphery of the non-metallic tube near the joint, and a socket made of an insulating material is fitted around the outer periphery of the metal sleeve. Is dissolved.

According to a sixth aspect of the present invention, in the fourth aspect, when the article to be joined is a non-metallic pipe, a metal sleeve is wound around an outer periphery near a joint of the metal-to-metal pipe; Further, a socket made of an insulating material is fitted around the outer periphery of the metal sleeve, the high-frequency magnetic flux is applied from the outside of the socket to heat the metal sleeve. And welding.

According to a seventh aspect of the present invention, in the fourth aspect, when the object to be joined is a metal tube, a metal socket is fitted around an outer periphery near a joining portion of the metal tube, and the metal member is connected to the metal tube. A brazing material is provided between the socket and the high-frequency magnetic flux is applied from outside the socket to melt the brazing material.

According to an eighth aspect of the present invention, in the fourth aspect, when the article to be joined is a metal rod or a metal pipe, a foil-like joining material is inserted between the joining end faces of the article to be joined. The method is characterized in that the joining material is diffused to the article to be joined by applying a coil current to the C-type inductor to join the article to be joined.

According to this invention, the object can be heated and joined only by disposing the C-type inductor so that the joint of the object is located at the opening thereof. The heating and joining operation can be performed without any need for opening / closing, detaching, and the like of the heating device. Further, the induction heating bonding apparatus using the C-type inductor is small and compact, can be gripped and handled by an operator, and by inserting the bonding portion of the workpiece into the opening as described above, The heating and joining operation can be started in a short time with little labor. Therefore, the joining operation of the objects to be joined is simplified, and the working efficiency is improved.

Further, since the article to be joined is disposed in an opening portion of the C-shaped inductor, which is an induction heating means for heating and joining the article, in a non-contact state with the inductor, it is possible to make contact with an electric member. Since there is no contact portion, there is no danger of occurrence of a contact failure or electric shock of an operator due to exposure of the electric contactor. Further, the C-type inductor can easily perform dust resistance and waterproof treatment on the surface layer portion, and from this aspect, safety against electric shock, electric leakage and the like is improved.

If the iron core is made of a ferrite core made of a ferromagnetic material, the magnetic resistance to the magnetomotive force is extremely small, the efficiency of generating magnetic flux is increased, and the efficiency of heating the joint is improved. I do. Therefore, heating and joining can be performed with less power than in the conventional technology, and high-frequency current can be reduced.Litz wire can be used, and the temperature rise of the device is reduced, natural cooling is sufficient, and special coil cooling means is required. And not.

According to the third aspect of the present invention, the coil conductor is connected to the tube during heating and joining work requiring a large coil current, such as when heating and joining a metal tube through a metal socket. Since the cooling liquid is made to flow through the inside thereof, the iron core and the coil conductor can be prevented from being overheated.

Further, according to the present invention, the objects to be joined can be heated and joined only by abutting the objects to each other via the foil-like joining material in the opening of the C-shaped inductor. The heating and joining work can be performed with a small number of parts.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to an embodiment shown in the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not merely intended to limit the scope of the present invention, but are merely illustrative examples unless otherwise specified. Absent.

[First Embodiment] FIG. 1 is a perspective external view showing the principle of heating by a C-type inductor according to a first embodiment of the present invention, and FIG. FIG. 3 is a front view showing the structure, FIG. 3 is a view taken in the direction of the arrow A in FIG. 2, and FIG.

In FIG. 1, reference numeral 50 denotes a C-type inductor, and 51 denotes an iron core of the C-type inductor 50, which is formed by forming a ferrite core, which is a ferromagnetic material, into a C-shape. Are joined. 52
Is a coil wound around the iron core 51, and a high-frequency coil current flows from a power supply 53 to the coil 52.

In FIGS. 2 and 3 showing such an induction heating and joining apparatus using a C-type inductor, the tube 1 as the object to be joined is disposed in an opening 51a of an iron core 51 constituting a C-type inductor 50. . At both ends of the iron core 52 on the opening 51a side, coil conductors 52, 52 connected to a power supply 53 (see FIG. 1) are wound. The coil conductor 52 includes
A litz wire whose wires are individually insulated is used.

Reference numerals 57, 57 denote support plates fixed to both upper and lower end surfaces of the iron core 51. Support rods 56 for gripping are fixed to ends of the support plates 57, 57 by bolts 59. Two or four upper and lower support bolts 58, 58 are attached to the other ends of the support plates 57, 57, that is, the coil conductor 52 side, and the coil conductors 52, 52 are attached by the support bolts 58, 58. To the support plates 57, 57
It is stuck to. C-type inductor 5 shown in FIGS.
0, the total height is about 200m
m, total width is about 100mm, depth is about 100mm,
The entire device is configured to be smaller and more compact than the conventional device, and can be easily transported by gripping the support rod 56.

In the induction heating bonding apparatus using the C-shaped inductor having the above-described structure, for example, as shown in FIG. As shown in the figure, the joint 1a of the pipes 1 and 1 is wrapped by an insulating socket 3 made of an insulating material having a metal sleeve 2 fixed to the inner periphery thereof. Is arranged so as to be substantially at the center of the opening 51a.

Next, as shown in FIG. 1, a high-frequency coil current flows from a power supply 53 to the coil conductor 52. The frequency of the coil current is maintained at, for example, about 20 to 80 kHz (heating can be performed at a higher frequency of about 200 kHz, and the value of the frequency is not particularly limited). This energization generates a high-frequency magnetic flux 54 inside the iron core 51,
When the magnetic flux 54 acts on the opening 51a of the mold inductor 50 in the vicinity of the metal sleeve 2 of the tube 1,1, the eddy current 5 is generated in the vicinity of the joint 1a of the tube 1,1 including the metal sleeve 2.
5 is induced, the metal sleeve 2 is heated and melted,
The pipes 1, 1 and the insulating socket 3 are welded. As a result, the tubes 1 are joined to each other via the insulating socket 3.

According to this embodiment, the coil conductor 52
High-frequency magnetic flux 5 that can weld and join the tube materials 1
The C-shaped inductor 50 in which the 4 is generated is connected to its opening 51a.
It is only necessary to arrange the joints of the pipes 1 and 1 at the same position, and there is no need to open and close the heating device and to remove it.
Can be heated and welded, so that the joining operation of the tube material 1 can be simplified and the working efficiency is improved.

Further, since the tube member 1 is disposed in the opening 51a where the magnetic flux is generated, the tube member 1 is not in contact with the end of the iron core 51 as the heating portion, the coil conductor 52, etc., and no contactor is required. In addition, there is no occurrence of contact failure, and there is no danger such as electric shock of the worker due to the exposure of the electric contactor as in the conventional case. In addition, since all the electrically charged portions such as the coil conductor 52 of the C-type inductor 50 can be subjected to dustproof and waterproof insulation treatment such as resin molding, occurrence of accidents such as electric leakage and electric shock can be avoided. .

Further, in this embodiment, a ferrite core made of a ferromagnetic material is used as the material of the iron core 51, and the relative magnetic permeability of the ferrite core is several thousand times as large as that of air. Because it becomes the magnetic path of
The magnetic resistance to the magnetomotive force becomes extremely small. Thereby, the generation efficiency of the magnetic flux 54 is increased, and the heating efficiency of the joint portion of the tube 1 is improved. By improving the heating efficiency, it is possible to heat and join the same-shaped tube material 1 with less electric power than in the related art.

Accordingly, the high-frequency current flowing through the coil conductor 52 can be reduced, so that it is possible to use a litz wire in which the wires are individually insulated, thereby reducing the loss and improving the heating efficiency from this aspect. I do. Further, as described above, since the coil current is small, the temperature rise of the apparatus is small,
Natural cooling is sufficient and does not require special cooling means.

Further, since the induction heating joining apparatus is small and compact as described above, the operator grasps the support rod 56 and holds the opening 5
By inserting 1a into the joint portion of the tube material 1, heating and joining work can be started in a short time with little labor, and work efficiency is improved.

[Experimental Example] Using the induction heating joining apparatus according to the present invention shown in FIGS. 2 and 3, a joining experiment of the pipe members 1 made of a nonmetallic material having an outer diameter of 30 mm was performed according to the following specifications. . Apparatus dimensions: total height 200 mm, total width 100 mm, depth 1
00mm Frequency of high frequency current: 30kHz Power supply pressure: 60W Heating time: 20 seconds

From the above experimental results, the induction heating bonding apparatus according to this embodiment is a very small apparatus,
It was confirmed that the joining of the tube material 1 can be reliably performed with a small amount of power and in a short time.

Second Embodiment FIGS. 5 and 6 show an induction heating bonding apparatus according to a second embodiment of the present invention, FIG. 5 is a front view thereof, and FIG. 6 is a view taken in the direction of arrow B in FIG. .

This embodiment employs an induction heating bonding apparatus using a C-shaped inductor 50 shown in FIG.
7 are joined together. In FIGS. 5 and 6,
Reference numerals 7 and 7 denote metal pipes to be joined, and 50 denotes a C-type inductor. Reference numeral 51 denotes an iron core of the C-type inductor 50;
As in the embodiment, the ferrite core is formed in a C-shape, and the pipe members 7, 7 are formed in the openings 51 a of the iron core 51.
Are arranged. The pipes 7 are covered with a metal socket 6 around the joint 7a, and silver brazes 07 are arranged at both fitting portions as shown in FIG.
A high-frequency magnetic flux, which will be described later, is acted on from the outside.

A coil conductor made of a copper tube 62 is wound around both ends of the iron core 51 on the opening 51a side. 61
a is a cooling water inlet pipe, 61b is a cooling water outlet pipe, and 61c is a cooling water connecting pipe. The cooling water inlet pipe 61a is connected to the inlet of the upper copper pipe 62, the cooling water outlet pipe 61b is connected to the outlet of the lower copper pipe 62, and the outlet of the upper copper pipe 62. And the inlet of the lower copper pipe are connected by the cooling water communication pipe 61c. Therefore, the cooling water enters the cooling water outlet pipe 61b from the cooling water inlet pipe 61a through the upper copper pipe 62, the cooling water communication pipe 61c, and the lower copper pipe 62, and enters the cooling water outlet pipe 61b. It is designed to be discharged outside. The cooling water may be flowed in the opposite direction to the above.

The other structure is the same as that of the first embodiment shown in FIGS. 1 to 3, and the same members are denoted by the same reference numerals.

In the second embodiment, when the metal pipes 7 are joined by heating, the pipes 7, 7 whose outer peripheral sides of the joints 7 a are covered with the metal sockets 6 are connected to the openings of the C-type inductor 50. A high-frequency coil current is supplied from a power supply 53 to a copper tube 62 as a coil conductor, as shown in FIG. Although the frequency of the coil current is maintained higher than that of the first embodiment, for example, about 80 kHz,
There is no particular limitation on the value of the frequency. This energization generates a high-frequency magnetic flux 54 inside the iron core 51,
When the magnetic flux 54 acts near the pipes 7, 7 and the metal socket 6 at the opening 51 a of the mold inductor 50, an eddy current 55 is induced in the pipes 7, 7 and the metal socket 6. The eddy current 55 heats the pipes 7 and 7 and the metal socket 6 to dissolve the silver solder 07, and the pipes 7 and 7 are firmly joined via the metal socket 6 by the silver solder 07.

At the time of heating and joining the tube members 7, 7,
A metal socket 6 thicker than the metal sleeve 2 of the first embodiment is fitted around the outer circumference of the metal pipes 7, 7, and an eddy current 55 is applied to the joint 7 a of the pipes 7 via the socket 6. In this embodiment, a larger high-frequency current flows through the copper tube (coil conductor) 62 than in the first embodiment.

As a result, the temperature of the coil conductor (copper tube) 62 and the temperature of the iron core 51 in which the coil conductor is fitted are higher than those of the first embodiment, so that the coil conductor 62 is passed through the copper tube 62 through which cooling water flows. Then, the copper tube 62 itself and the iron core 51 are cooled. That is, the cooling water enters the upper copper pipe 62 from the cooling water inlet pipe 61a, passes through the copper pipe 62, and cools the copper pipe 62 and the iron core 51 in the vicinity thereof. Then, the cooling water flows into the lower copper pipe 62 through the cooling water communication pipe 61c to cool the copper pipe 62 and the iron core 51 in the vicinity thereof, and then is discharged to the outside from the cooling water outlet pipe 61b. You.

Therefore, according to this embodiment, the coil current increases due to the heat joining through the metal pipes 7, 7 and the metal socket 6, and the coil conductor 62 and the iron core 51 in the vicinity thereof are heated. Also, the coil conductor is constituted by a copper tube 62, and cooling water is passed through the copper tube 62 to cool the coil conductor 62 and the iron core 51, thereby preventing the coil conductor 62 and the iron core 51 from overheating. be able to.

[Experimental Example] A joining experiment of steel pipes 7 having an outer diameter of 30 mm using the induction heating joining apparatus (the outer diameter is substantially the same as that of the first embodiment) shown in FIGS. Performed by Frequency of high frequency current: 80 kHz Power output: 5.0 kw Heating time: 26 seconds

According to the above experimental results, in this embodiment, the current of the higher frequency and the power supply output are larger than those of the first embodiment because the metal pipes are joined together.
The tube members 7, 7 could be reliably joined together with a heating time and heating power that is a fraction of that of an apparatus using a conventional solenoid type coil.

Third Embodiment FIGS. 8 to 10 show an induction heating apparatus according to a third embodiment of the present invention, FIG. 8 is a front view thereof, FIG. 9 is a view taken in the direction of arrow C in FIG. FIG. 3 is a side view of a bar joining portion.

In this embodiment, the metal rods 5 and 5 are joined to each other, and a foil-like joining material 71 is interposed at the joint between the rods 5 and 5.

That is, in FIGS. 8 to 10, reference numerals 5 and 5 denote bars which are members to be joined.
The joint is arranged in 1a. A foil-like joining material 71 made of an amorphous foil having a thickness of several tens of microns is inserted between the joining portions, that is, between the end faces of the bars 5. Reference numeral 51 denotes an iron core of the C-type inductor 50, and reference numeral 62 denotes a copper tube as a coil conductor. The other configuration, that is, the configuration of the induction heating bonding apparatus itself is the same as that of the second embodiment shown in FIGS. 5 to 6, and the same members are denoted by the same reference numerals.

In this embodiment, as in the second embodiment, a high-frequency coil current is passed through the copper tube 62 serving as a coil conductor, and a high-frequency magnetic flux is generated inside the iron core 51. The foil-like joining material 71 is heated by the eddy current induced by the high-frequency magnetic flux to such an extent that the bar material 5 into which the foil-like joining material 71 is inserted is not melted. By this heating, the foil-like joining material 71 is diffused into the bar material 5 to be joined and joins the bar material 5.

According to this embodiment, the C-type inductor 50
Since the rods 5 and 5 are inserted into the opening 51a of the base member 5 by inserting the foil-like joining material 71 and heated by the C-type inductor 50,
The workpiece (bar member 5) can be arranged very easily, and the metal sleeve and insulating socket or the metal socket and brazing material as in the first and second embodiments are not required at all.

[Experimental Example] A joining experiment between steel bars 5 having an outer diameter of 28 mm using the induction heating joining apparatus (the outer diameter is substantially the same as the first embodiment) shown in FIGS. Performed by Frequency of high frequency current: 50 kHz Power output: 5.0 kw Heating time: 20 seconds

From the above experimental results, it was confirmed that the rods 5 and 5 could be reliably joined with a heating time and heating power that is a fraction of that of the conventional method using a solenoid coil.

In the above embodiment, the metal bar 5 is used as the object to be joined, but the present invention can be easily applied even if the object to be joined is a metal tube.

[0059]

As described above, according to the present invention, only the opening of the C-type inductor is arranged at the joint of the article to be joined.
The device using the C-shaped inductor can be heated and joined, and the device using the C-type inductor is lightweight, small, and easy to handle. improves. Further, since there is no contact between the C-type inductor and the article to be joined, there is no occurrence of an accident such as poor contact or electric shock as in the prior art, and safety is improved.

Further, when the iron core of the C-type inductor is formed of a ferromagnetic ferrite core as described in claim 2, the efficiency of magnetic flux generation is improved, and the heat bonding can be performed with a small amount of power and a small current. The amount is reduced. This also allows the use of litz wire and eliminates the need for special cooling means, which also simplifies the structure.

According to the third aspect of the present invention, since the coil conductor itself is used as the cooling means, the coil conductor and the iron core can be cooled with a compact structure, and overheating of these can be prevented.

Further, according to the eighth aspect of the present invention, it is possible to perform the heat joining only by abutting the objects to be joined via the foil-like joining material, so that the heat joining operation is simplified and the simple structure is achieved. The heat bonding apparatus can be configured with a small number of parts.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a heating principle of an induction heating bonding apparatus using a C-type inductor according to an embodiment of the present invention.

FIG. 2 is a front view of the induction heating bonding apparatus according to the first embodiment of the present invention.

FIG. 3 is a view as seen from the direction of arrow A in FIG. 2;

FIG. 4 is a cross-sectional view of a main part of a pipe material joint in the first embodiment.

FIG. 5 is a view corresponding to FIG. 2, showing a second embodiment of the present invention.

6 is a view as viewed in the direction of the arrow B in FIG. 5;

FIG. 7 is a cross-sectional view of a main part of a pipe joint in the second embodiment.

FIG. 8 is a view corresponding to FIG. 2, showing a third embodiment of the present invention.

FIG. 9 is a view as viewed in the direction of arrow C in FIG. 8;

FIG. 10 is a cross-sectional view of a joint in the third embodiment.

FIG. 11 is an explanatory diagram of the principle of a solenoid type coil according to the related art.

FIG. 12 is a structural diagram of a nipple joint according to the related art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pipe material (non-metallic pipe material) 1a Joint part 2 Metal sleeve 3 Insulated socket 5 Bar material 6 Metal socket 7 Tube material (metallic tube material) 07 Silver brazing 50 C type inductor 51 Iron core 51a Opening 52 Coil conductor 53 Power supply 54 Magnetic flux 55 Eddy current 56 Support rod 57 Support plate 58 Support bolt 61a Cooling water inlet pipe 61b Cooling water outlet pipe 61c Cooling water communication pipe 62 Copper pipe (coil conductor) 71 Foil-like joining material

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H05B 6/42 H05B 6/42 // B23K 101: 06 103: 02 103: 08 (72) Inventor Keiji Yoshimura Mitsubishi Heavy Industries, Ltd.Hiroshima Works 4-72 Kanon Shinmachi, Nishi-ku, Hiroshima City (72) Inventor Mitsuo Kato 1-8-1, Koura, Kanazawa-ku, Yokohama-shi Mitsubishi Heavy Industries, Ltd.Basic Technology Research Laboratory (72) Inventor Eguchi Gotoshi 2-4-2-3 Jonanjima, Ota-ku, Tokyo Co., Ltd.Eguchi High Frequency Co., Ltd. (72) Inventor Nobuo Iwama 2-4-2-3, Jonanjima, Ota-ku, Tokyo Co., Ltd. 2-4-3 Jonanjima, Ota-ku, Tokyo F-term in Eguchi High-frequency Company (Reference) 3K059 AA08 AA10 AB24 AB27 AB28 AD03 AD10 AD36 AD37 AD40 CD48 CD66 4E067 AA 01 AA15 AD03 BH01 CA00 EC05 EC06

Claims (8)

[Claims] 1. A heating and joining apparatus for joining articles to be joined such as pipes and rods by heating, wherein the iron core is formed in a C-shape so that a joint of the articles can be inserted into an opening. A coil conductor wound around the opening of the iron core and through which a high-frequency current flows.
A C-type inductor, wherein the C-type inductor is configured to apply a high-frequency current to the coil conductor and generate a high-frequency magnetic flux inside the iron core, thereby heating the vicinity of the joint of the joint. An induction heating bonding apparatus, characterized in that: 2. The induction heating joining apparatus according to claim 1, wherein the iron core is formed of a ferrite core, and the coil conductor is formed of a litz wire in which strands are individually insulated. 3. The coil conductor is constituted by a tubular body such as a copper tube, and a cooling liquid is caused to flow through the inside of the tubular body to cool the coil conductor itself and an iron core portion in the vicinity thereof. The induction heating bonding apparatus according to claim 1, comprising: 4. A C-shaped inductor formed by winding a coil conductor around an outer periphery of a C-shaped iron core when joining an object to be joined such as a tube or a rod by heating. A high-frequency current is supplied to the coil conductor to generate a high-frequency magnetic flux inside the iron core, and the eddy current generated by the magnetic flux is used to join the objects to be bonded. An induction heating joining method characterized by heating the vicinity of a part. 5. When the object to be joined is a non-metallic tube, a metal sleeve is wound around an outer periphery near a joint of the metal-to-metal tube, and a socket made of an insulating material is further provided around the outer periphery of the metal sleeve. 5. The induction heating joining method according to claim 4, wherein the metal sleeve is melted by fitting and applying the high-frequency magnetic flux from outside the socket. 6. When the object to be joined is a non-metallic tube, a metal sleeve is wound around an outer periphery near a joining portion of the metal-to-metal tube, and a socket made of an insulating material is provided around the outer periphery of the metal sleeve. The metal tube is heated by applying the high-frequency magnetic flux from the outside of the socket, and the tube material and the insulating socket are welded by the heat of the high-temperature metal sleeve. Induction heating joining method. 7. When the object to be joined is a metal tube,
A metal socket is inserted into the outer periphery near the joint of the metal tube and a brazing material is arranged between the tube and the socket, and the high-frequency magnetic flux acts from outside the socket to melt the brazing material. The induction heating bonding method according to claim 4, wherein: 8. When the article to be joined is a metal bar or a metal pipe, a foil-like joining material is inserted between the joining end faces of the article to be joined, and coil current is applied to the C-type inductor. 5. The induction heating bonding method according to claim 4, wherein the bonding material is diffused into the bonding object by applying a current to the bonding object to bond the bonding object.