JP3822680B2 - Method and apparatus for cooling induction heated joint - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
In the present invention, a bonding material is interposed between metal bodies having a circular cross section such as a metal tube or a metal rod, and after joining the metal body by induction heating of the joint by an induction coil arranged on the outer peripheral side of the joint, The present invention relates to a cooling method and a cooling device for an induction-heated joint for rapidly cooling the joint region.
[0002]
[Prior art]
As means for butt-joining end surfaces of metal bodies having a circular cross section such as metal tubes and metal rods, recently, liquid phase diffusion bonding methods have attracted attention in addition to various welding methods and pressure welding methods. In this diffusion bonding method, a bonding material such as an amorphous metal foil is interposed between both end faces of the metal bodies to be bonded, and the elements contained in the foil are liquid-phase diffused in both metal bodies to thereby form both metal bodies. It is a method of joining.
For example, in the case of a diffusion bonding method or a pressure welding method for joining steel materials, it is necessary to heat the joint to 950 to 1300 ° C. As the heating means, the heating region and the heating temperature can be easily controlled by selecting the frequency. Inductive heating methods are widely adopted. Thus, when adopting a joining method that requires heating at the time of joining, in many cases, manual work is often required when attaching or removing the induction heating coil, and this joining work can be performed in a shorter time. In order to perform safely, depending on the case, in order to prevent the strength deterioration of the base material, it is necessary to cool the bonding portion heated by the induction heating coil at the time of bonding in a shorter time.
[0003]
Conventionally, regarding cooling of a metal body having a circular cross section, for example, at the time of high frequency induction quenching, a high frequency induction heating coil and a cooling means are arranged in parallel in the axial direction on the outer peripheral side of the metal body having a circular cross section to perform high frequency induction heating. A cooling method (apparatus) for quenching that quenches is known.
In addition, when quenching a mechanical part such as a shaft, a quenching apparatus including a cooling device that cools an induction heating coil by injecting a cooling medium onto an object to be heated is also known. There is no cooling method (apparatus) applied to cooling the heated joint after joining.
[0004]
It is also conceivable to use the cooling device in the quenching device as a cooling device for the heated joint after induction heating and joining.
However, in the cooling device in these quenching devices, the induction heating coil and the cooling device are integrally formed, so when this cooling device is formed of copper or a copper alloy that does not inhibit induction heating, A certain amount of thickness is required, and if the heating is not performed in a short time, the cooling device may be damaged by being heated by radiation or induction heating.
[0005]
For this reason, there is a possibility that the power supply for heating may be restricted, such as the necessity of increasing the power supply capacity, and the shape of the induction heating coil needs to be complicated.
In addition, there is a problem that the winding of the induction heating coil is short-circuited and damaged due to the cooling medium bounces and oozes out to the induction heating coil, or the coating material is damaged (reference technique JP-A-60-59015, 55-85621).
[0006]
[Problems to be solved by the invention]
In the present invention, after a joining material is interposed between metal bodies having a circular cross section such as a metal tube or a metal rod, and the joining portion is induction-heated by an induction heating coil arranged on the outer peripheral side of the joining portion to perform diffusion joining or pressure joining. Inductively heated, which can quickly cool the heated and heated joints, reduce the work time of the joint and prevent the induction heating coil from being damaged by the cooling medium, and in some cases can prevent deterioration of the strength of the base material A cooling method and a cooling device for a joint are provided.
[0007]
[Means for Solving the Problems]
According to a first aspect of the present invention, a joining material is interposed between end joining surfaces of opposing metal bodies having a circular cross section, and the joining portion is formed by a hollow cylindrical body with an induction heating coil disposed on the outer peripheral side of the joining portion. After the metal body is joined by induction heating, it has a length exceeding the length of the hollow cylinder in the standby state at a position away from the hollow cylinder in the axial direction during induction heating , and is cooled inside. A cooling cylinder having an inner / outer double pipe structure having a medium flow passage is inserted between the outer peripheral surface of the metal body and the inner surface of the hollow cylindrical body , and a plurality of ejection holes arranged on the inner cylinder surface of the cooling cylinder on the metal body side a inductively heated junction cooling method characterized by cooling the joint after induction heating by ejecting a cooling medium from.
[0008]
The second invention or the third invention is positioned as an example of an apparatus for carrying out the first invention, and the second invention is guided to the outer peripheral side of the joint portion of the metal body having the opposite circular cross section. A hollow cylindrical body with a built-in heating coil is disposed , a plurality of ejection holes are provided on the inner surface side of the metal body, a cooling medium supply pipe is connected, the length exceeds the length of the hollow cylindrical body, and a cooling medium flow passage is provided inside A cooling cylinder having an inner / outer double pipe structure having a cylindrical structure is integrally disposed by a support rod and a moving element extending from a support attached to the outer peripheral side of the hollow cylinder, and is inserted into and retracted from the hollow cylinder. It is a cooling device for an induction-heated joint, which is arranged so as to be movable in the axial direction as possible.
[0009]
According to a third aspect of the present invention, a hollow cylindrical body with an induction heating coil is disposed on the outer peripheral side of a joint portion of metal bodies having opposite circular cross sections, and a plurality of ejection holes are provided on the inner surface side of the metallic body in the axial direction of the hollow cylindrical body. A cooling medium supply pipe connected to the cooling cylinder having an inner and outer double pipe structure having a length exceeding the length of the hollow cylindrical body and having a cooling medium flow passage inside; A cooling device for an induction-heated joint, which is mounted so as to be freely inserted and retracted between hollow cylindrical bodies.
[0010]
The fourth invention is characterized in that, in the second invention or the third invention, the cooling cylinder and the hollow cylindrical body incorporating the induction heating coil are of a split type, and the fifth invention is the third invention. In the third aspect of the present invention, only the cooling cylinder is a split type. In the third aspect of the invention, only the hollow cylindrical body incorporating the induction heating coil is a split type .
In the following description, a hollow cylindrical body with a built-in induction heating coil is simply abbreviated as an induction heating coil.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
In the present invention, a joining material is interposed between joining surfaces of opposing metal bodies having a circular cross section, and a joined part (a part given a point indicated by reference numeral 4 in FIGS. 1 to 4 is referred to as a joined part region hereinafter). When the metal body is diffusion-bonded or pressure-welded by induction heating with an induction coil arranged on the outer peripheral side of the This is for cooling in a short time and uniformly while preventing the induction heating coil from being damaged by the cooling medium.
[0012]
For this purpose, a double pipe structure having a cooling medium flow passage inside, the length of the cooling cylinder having a plurality of ejection holes on the inner surface side is made longer than the induction heating coil length, and induction heating is performed during induction heating. It was made to stand by on the outside away from the coil, and immediately after joining by induction heating, it was inserted between the induction heating coil and the outer periphery of the metal body as soon as possible, and provided on the inner surface of this cooling cylinder while protecting the induction heating coil . It is ejected cooling medium from a plurality of ejection holes, and the key, characterized in that induction heating to configured to cool the heated junction regions after joining.
[0013]
In addition, in order to make the induction heating coil and the cooling cylinder easily attachable to and detachable from the outer peripheral portion of the metal body, the induction heating coil and the metal cylinder are configured in a split type.
If a cooling medium suction device is installed in the cooling cylinder, the cooling medium can be promoted to improve the cooling capacity, and the cooling medium can be prevented from flowing out of the cooling cylinder to enhance environmental conservation or cooling. This is effective for facilitating the recycling of the medium.
The present invention is mainly used in the case of using diffusion bonding such as liquid phase diffusion bonding and diffusion brazing, or pressure welding bonding, in which the bonding region is bonded by induction heating.
[0014]
The case where each invention of the present invention is applied to cooling after diffusion bonding by induction heating for liquid phase diffusion bonding of metal tubes will be described below.
1 to 2 show an embodiment according to the first invention and the second invention. In the induction heating coil disposed on the outer peripheral side of the butt joint portion region between the metal pipes to be diffused and joined, the induction coil This is a case where a cooling cylinder having a length exceeding the length is inserted inside the induction heating coil and disposed so as to be movable in the axial direction so as to be retracted outside the induction heating coil.
[0015]
In FIG. 1, reference numerals 1 and 2 denote metal pipes to be joined, which are opposed to each other with a joining material 13 interposed therebetween, and an induction heating coil 3 is disposed on the outer peripheral side of the joint portion 4 region. ) Is supported and disposed so as to form a heating space A between the outer periphery of the joint 4 region.
[0016]
The induction heating coil 3 is composed of a winding 3c, a glass wool or refractory material that protects the winding 3c, and a heat insulating material for ensuring sufficient heating efficiency. A high frequency current is applied to the winding 3c by, for example, a high frequency power source. This is for inductively heating and diffusing and joining the butt joint region between the metal tube 1 and the metal tube 2 inside the induction heating coil 3. In this diffusion bonding, the temperature of the bonding portion 4 and the vicinity thereof is 950 to 1300 ° C. in the case of steel.
[0017]
Therefore, when manual work is involved in attaching and detaching the induction heating coil 3 to and from the metal tubes 1 and 2, it is difficult to proceed with the next joining work until the temperature reaches a level that does not hinder manual work. In some cases, the strength of the base material is further deteriorated, and the strength of the joint region may be lowered.
Therefore, in the present invention, immediately after the diffusion bonding is completed by induction heating, the heated joint 4 region is rapidly cooled.
[0018]
For this purpose, the induction heating coil 3 is integrally provided with a cooling cylinder 5 for rapidly cooling the heated joint region after diffusion bonding. Is supported by a support rod 6b provided on the support 6 so as to be movable in the axial direction via a moving element 6s, and the induction heating coil 3 is retracted in the axial direction of the induction heating coil 3 during induction heating of the joint 4 region. (Moving) is possible, and the induction heating is performed in the direction of the arrow 15 at the same time as the end of the diffusion bonding, and as shown in FIG. The joint 4 region heated by induction can be cooled by the cooling medium 7 from the cooling cylinder 5 inserted (moved) between the inner surfaces.
[0019]
The cooling cylinder 5 is a double cylinder, and a flow path 8 for the cooling medium 7 is formed between the outer cylinder 5o and the inner cylinder 5i having the plurality of cooling medium 7 ejection holes 5h. Are connected to a cooling medium supply source 9 via a cooling medium supply device 10.
When the cooling by the cooling cylinder 5 is non-uniform, the joint region is at a high temperature as described above, and there is a concern that thermal distortion may occur and the strength of the joint region may be reduced. A plurality of ejection holes 5h are regularly arranged on the inner surface of the cooling cylinder 5 so as to be able to do so.
[0020]
The length of the cooling cylinder 5 is longer than the length of the induction heating coil 3 in the state of FIG. Cooling medium 7 is ejected from a plurality of ejection holes 5h of the cooling cylinder 5, and the cooling medium 7 ejected and scattered when cooling the heated joint 4 region is cooled so as not to contact the induction heating coil 3. Damage to the induction heating coil 3 by the medium 7 is prevented.
[0021]
By comprising in this way, after joining the joining material 13 between the joining surfaces of the metal tube 1 and the metal tube 2 and performing diffusion welding by induction heating the joint region by the induction heating coil disposed on the outer peripheral side thereof For example, in the case of steel, the joint region heated up to 950 to 1300 ° C. is immediately joined by the cooling medium 7 ejected from the ejection hole 5h of the cooling cylinder 5 while preventing the induction heating coil from being damaged by the cooling medium. Rapid cooling to a temperature of 200 to 100 ° C., which does not hinder the progress, can shorten the bonding work time.
[0022]
In the figure, reference numeral 12 denotes a spacer that forms a predetermined cooling space 14 between the outer circumferences of the metal tubes 1 and 2 and the inner surface of the cooling cylinder 5. The predetermined cooling space 14 may be adjusted in advance by an adjusting mechanism (not shown) provided in a movable carriage (not shown).
In this example, the cooling timing is delayed by the moving time of the cooling cylinder 5, but the cooling cylinder 5 is not induction-heated and does not hinder induction heating. it can.
[0023]
FIG. 3 is an embodiment according to the first and third aspects of the present invention, an induction heating coil disposed on the outer peripheral side of a butt-joining region of a metal tube and a metal tube facing each other, and an induction heating coil. Make the cooling cylinder axially close to the induction heating coil placed on the outer peripheral side of the butt joint area of the metal pipe facing the metal pipe that is to be joined separately from the cooling pipe of a length exceeding the length It is a thing when it is mounted | worn with movement freely.
[0024]
In FIG. 3, the cooling cylinder 5 is mounted so as to be movable in the direction of the arrow between the outer periphery of the joint 4 area of the metal tubes 1 and 2 and the outer area in the axial direction of the induction heating coil 3. When the diffusion bonding is performed, the coil is kept outside the induction heating coil 3 and moved in the direction of the arrow 15 simultaneously with the end of the diffusion bonding. As shown in FIG. Inserted between the outer peripheral surface and the inner surface of the induction heating coil 3, the cooling medium 7 is ejected from the plurality of ejection holes 5 h of the cooling cylinder 5, and the heated joint portion 4 region after diffusion bonding is formed on the induction heating coil 3. Cooling to a predetermined temperature range is performed while preventing damage by the cooling medium.
In this case, as in the case of the second invention, the cooling timing is delayed by the moving time of the cooling cylinder 5, but the cooling cylinder 5 is not induction-heated and does not hinder induction heating. Therefore, the restriction conditions for the material of the cooling cylinder can be relaxed.
[0025]
When each of the induction heating coil 3 and the cooling cylinder 5 is integrally formed as in each of the inventions shown in FIGS. 1 to 4 described above, the joint region between the metal tube 1 and the metal tube 2 is It is necessary to insert the induction heating coil 3 into the cooling cylinder 5 and perform induction heating and diffusion bonding to cool and pass the heated joint region and the induction heating coil 3 after passing through the metal tube 1 and the metal tube 2. It is difficult to say that the induction heating coil 3 and the cooling cylinder 5 can be easily attached to and detached from the joint area, and the induction heating coil 3 and the cooling cylinder 5 may be damaged when the metal pipe 1 and the metal pipe 2 pass through.
[0026]
Therefore, in the fourth invention, in the second invention as shown in FIG. 1 and FIG. 2 for carrying out the first invention, FIG. As shown in the example of the state inserted between the outer periphery of the heated joint 4 region and the induction heating coil 3, the induction heating coil 3 is divided into 3a and 3b, and the cooling cylinder 5 is divided into 5a and 5b, respectively. The joining of the metal bodies 1 and 2 in a state in which the engaging bolts 16 are engaged with the engaging holes 17 of the flange portions 3f1 and 3f2 formed in the divided induction heating coils 3a and 3b and a joining material is interposed therebetween. Attach to the outer periphery of the area.
[0027]
And in the case of diffusion bonding by induction heating, the cooling cylinder 5 is moved in the axial direction and retracted to the outer periphery of the metal tubes 1 and 2 outside the induction heating coil 3, and after diffusion bonding is completed, As shown in FIG. 5, the cooling cylinder 5 is inserted between the outer periphery of the heated joint 4 region and the induction heating coil 3, and the cooling medium 7 is ejected from the ejection holes 5 h of the cooling cylinder 5 to be heated. Cool 4 zones.
When the induction heating coil 3 and the cooling cylinder 5 are removed from the outer periphery of the joint 4 region of the metal pipes 1 and 2, the locking of the locking bolts 16 is released so that the induction heating coil 3 and the cooling cylinder 5 are made of metal. It can be easily removed from the outer periphery of the joint area of the bodies 1 and 2.
[0028]
Further, in the third invention as shown in FIGS. 3 and 4 in which the first invention is implemented, the cooling cylinder 5 is placed outside the induction heating coil 3 after induction heating and diffusion bonding in FIG. The induction heating coil 3 is divided into 3a and 3b, and the induction heating coil 3 includes flange portions 3f1 and 3f2 formed on the divided induction heating coils 3a and 3b. The locking bolt 16 is engaged with the locking hole 17 and attached to the outer peripheral side of the bonded portion 4 region of the metal pipes 1 and 2 in a state of being abutted with a bonding material interposed.
[0029]
On the other hand, the cooling cylinder 5 is divided into 5a and 5b, and one end side can be opened and closed around the support shaft 18, and is brought close to the induction heating coil 3 mounted on the outer periphery of the joint portion 4 region of the metal tubes 1 and 2, After temporarily mounting the metal tube 1 in the open state, the metal tube 1 is closed and then inserted into a locking hole 19 formed in the butted portion on the other end side of the cooling cylinders 5a and 5b. Attached movably in the axial direction.
After induction heating by the induction heating coil 3 and diffusion bonding, the cooling cylinder 5 is moved in the direction of the arrow 15 and inserted between the outer periphery of the joint area of the induction heating coil 3 and the metal tubes 1 and 2. The cooling medium 7 is ejected from the ejection holes 5h to cool the heated joint 4 region.
[0030]
When the induction heating coil 3 is removed, it can be easily removed from the outer peripheral portion of the joint region of the metal bodies 1 and 2 by releasing the locking by the locking bolt 16 engaged with the locking holes 17 of the flange portions 3f1 and 3f2. Can be removed.
Further, when removing the cooling cylinder 5, the cooling cylinder 5 is moved to a standby position to the original position, and the locking tool 20 is pulled out from the locking hole 19 to be easily removed from the outer peripheral portions of the metal tubes 1 and 2. be able to.
[0031]
In the fifth invention, in the third invention, as shown in FIG. 7, the cooling cylinder 5 is divided into 5 a and 5 b so that one end side can be opened and closed around the support shaft 18. It is made close to the induction heating coil 3 mounted on the outer periphery of the joint 4 region, temporarily mounted on the outer periphery of the metal tube 1 in an open state, and then closed to be formed at a butt portion on the other end side of the cooling cylinders 5a and 5b. The locking tool 20 is inserted into the locking hole 19, and the cooling cylinder 5 is mounted so as to be movable in the axial direction.
[0032]
After induction heating by the induction heating coil 3 and diffusion bonding, the cooling cylinder 5 is moved in the direction of the arrow 15 and inserted between the outer periphery of the joint area of the induction heating coil 3 and the metal tubes 1 and 2. The cooling medium 7 is ejected from the ejection holes 5h to cool the heated joint 4 region.
When the cooling cylinder 5 is removed, the cooling cylinder 5 is moved to a standby position to the original position, the locking tool 20 is pulled out from the locking hole 19, and 5a and 5 are opened around the support shaft 18 to b It can be easily removed from the outer periphery of the metal tubes 1 and 2.
[0033]
In the sixth invention, in the third invention, as shown in FIG. 8, the induction heating coil 3 is divided into 3a and 3b, and the flange portions 3f1 and 3f2 formed on the divided induction heating coils 3a and 3b are engaged. The locking bolt 16 is engaged with the stop hole 17 and attached to the outer peripheral side of the joint portion region of the metal pipes 1 and 2 in a state of being joined with the joining material interposed.
[0034]
On the other hand, the cooling cylinder 5 is arranged close to the induction heating coil 3 and kept waiting, and the induction heating coil 3 induction heats the joint 4 region and moves in the direction of arrow 15 after diffusion bonding. And it inserts between the outer periphery of the junction part area | region of the induction heating coil 3 and the metal pipes 1 and 2, and the junction part 4 area | region heated by ejecting the cooling medium 7 from the ejection hole 5h of the cooling cylinder 5 is cooled.
When the induction heating coil 3 is removed, it can be easily removed from the outer peripheral portion of the joint region of the metal tubes 1 and 2 by releasing the locking by the locking bolt 16 engaged with the locking holes 17 of the flange portions 3f1 and 3f2. Can be removed.
[0035]
The induction heating coil used in each of the above inventions of the present invention is mounted alone or in a moving body such as a carriage incorporating a cooling cylinder, and when the joining surfaces of opposing metal pipes to be joined are abutted. Or, it may be arranged on the outer peripheral surface side of the joint portion 4 region of the metal pipes 1 and 2 by using a manual operation after the abutting, or in the case of a light weight, the handling may be performed manually. Good.
[0036]
When the cooling cylinder is installed separately from the induction heating coil, it is mounted on a moving body with a centering function, and manual operation is also used when abutting the joint surfaces of opposing metal pipes to be joined. It may be placed outside the joint area of the metal tube and kept waiting, and it may be inserted and aligned between the inner surfaces during cooling. You may go.
[0037]
The present invention is not limited to the one described in FIGS. 1 to 8, but is modified within a range that satisfies the scope of claims 1 to 6.
For example, induction heating coil structure (including material), cooling cylinder structure (including material), cooling medium type (water, liquid such as oil, air, nitrogen gas, etc., liquid-gas mixture, steam, etc. The attachment / detachment structure for the outer peripheral portion of the metal body is changed depending on the material, size, joining conditions, etc. of the metal body to be joined.
[0038]
In addition, for the cooling cylinder, a cooling medium suction device is installed to improve the cooling capacity by promoting the circulation of the cooling medium, or to prevent the cooling medium from flowing out of the cooling cylinder to enhance environmental conservation. A structure that facilitates circulation of the cooling medium may be adopted.
The present invention is more effective when applied to diffusion bonding by induction heating of a metal body having a circular cross section such as a metal rod in addition to a metal tube, using a diffusion bonding method. Diffusion bonding can be performed cheaply and easily compared with other bonding methods such as MIG welding, TIG welding, or pressure welding. Suitable for joining circular cross-section metal bodies.
[0039]
The reason why induction heating is applied in the present invention is that the junction region and temperature can be controlled with high accuracy.
In the present invention, the heated joint region after joining by induction heating can be uniformly cooled in a short time while preventing the induction heating coil from being damaged by the cooling medium. The time can be greatly shortened and the joining work time can be greatly shortened.
[0040]
【Example】
In this embodiment, an induction heating coil and a cooling device as shown in FIGS. 1 and 2 and FIGS. 3 and 4 are used to perform bonding by a liquid phase diffusion bonding method. Is the case of cooling according to the first invention.
[0041]
Here, the metal body to be joined is a steel pipe having STK400 defined in JIS G3444, an outer diameter of 264.4 mm, an inner diameter of 228.8 mm, and a wall thickness of 17.8 mm.
An amorphous metal foil was sandwiched between the end faces of the opposing steel pipes as a bonding material, and diffusion welding was performed by induction heating under a load of about 900 kg. The amorphous metal foil has a composition of Fe-9 wt% Si-1.5 wt% B and has a thickness of 30 μm.
The joint area was set within a range of 100 mm from the butt surface.
The induction heating coil used for heating has an inner diameter of 330 mmφ, a length of 200 mm and a winding number of 10 turns, and the connected power supply is a high-frequency power supply with a maximum output of 50 kW and a frequency of 8 kHz. With this power source, the secondary power was induction-heated to 40 kW (700 V, 60 A), heated to 1200 ° C. at a rate of temperature increase of approximately 2 ° C./second, held for 5 minutes, and then turned off. Immediately after turning off the power, normal temperature cooling water is supplied to the cooling cylinder as a cooling medium, and sprayed at a jet water density of 300 liters / m ² · min from the jet hole to bring the joint from 1200 ° C to 200 ° C where there is no hindrance to handling. Cooled down.
The cooling cylinder is made of a copper alloy and has an inner diameter of 290 mmφ, an outer diameter of 320 mmφ, and an axial length of 400 mmφ.
[0042]
In this example, the time required for lowering the surface temperature of the joining point from 1200 ° C. to 200 ° C. in the joining region was 65 to 80 seconds.
On the other hand, in the comparative example in which induction heating was performed under the same conditions as in the example, diffusion bonding was performed and the power supply was turned off after holding, and immediately allowed to cool, 1980 seconds, which is about 20 times longer than the required time in the example, I needed it.
[0043]
In the case of the example, it was possible to cool in a very short time, and to move to the next work in a very short time.
Moreover, in the examples, there was no splash of cooling water to the induction heating coil, no oozing out, and no damage to the induction heating coil or the coating material was observed. Also, no damage was observed in the cooling cylinder.
[0044]
【The invention's effect】
In the present invention, when a metal body having a circular cross section such as a metal tube or a steel bar is joined using a diffusion joining method or a pressure welding method, the joint region that has become hot due to induction heating is damaged by the cooling medium of the induction coil. It is possible to cool uniformly and rapidly while preventing.
Therefore, the working time for joining can be greatly shortened, the induction heating coil can be protected, and the life extension can be realized. In this case, when the induction heating coil and the cooling cylinder are divided, the attaching / detaching operation time with respect to the outer peripheral portion of the metal body can be shortened.
Further, since the cooling cylinder is retracted during the induction heating, there is no concern about the induction heating efficiency being lowered by the cooling cylinder, and the cooling cylinder can be prevented from being damaged by the induction heating.
[Brief description of the drawings]
FIG. 1 is a partially cutaway sectional side view illustrating a first example of an induction heating coil and a joint cooling device according to the present invention.
2 is a partially cutaway sectional side view illustrating an operation example of the induction heating coil and the joint cooling device (cooling cylinder) of FIG. 2;
FIG. 3 is a partially cutaway sectional side view illustrating a second example of the induction heating coil and the joint cooling device of the present invention.
4 is a partially cutaway sectional side view illustrating an operation example of the induction heating coil and the joint cooling device (cooling cylinder) in FIG. 2;
FIG. 5A is a partially cutaway sectional side view showing a third example of the induction heating coil and the joint cooling device of the present invention, and FIG. 5B is a view along arrow Aa-Ab in FIG. Cross-sectional explanatory drawing.
6 (a) is a partially cutaway sectional side view showing a fourth example of the induction heating coil and the joint cooling device of the present invention, and FIG. 6 (b) is a view taken along the line Ba-Bb in FIG. 6 (a). Cross-sectional explanatory drawing.
7A is a partially cutaway sectional side view illustrating a fifth example of the cooling apparatus for induction heated joints according to the present invention, and FIG. 7B is a Ca—Cb arrow in FIG. 7A. FIG.
8A is a partially cutaway sectional side view illustrating a sixth example of the induction heating coil and the joint cooling device of the present invention, and FIG. 8B is a view taken along the line Da-Db in FIG. 8A. Cross-sectional explanatory drawing.
[Explanation of symbols]
1, 2 Metal tube 3 Induction heating coils 3a, 3b Induction heating coils (divided)
3c Winding 3f1, 3f2 Flange A Heating space 4 Joint 5 Cooling cylinder 5a, 5b Cooling cylinder (divided)
5o outer cylinder 5i inner cylinder 5h ejection hole 6 support 6b support rod 6s slider 7 cooling medium 8 cooling medium flow path 9 cooling medium supply source 10 cooling medium supply device 11 cooling medium supply pipe 12 spacer 13 bonding material 14 cooling space 15 Arrow (movement direction)
16 Locking bolt 17 Locking hole 18 Spindle 19 Engaging hole 20 Locking tool

Claims (6)

  A joining material is interposed between the end joint surfaces of the metal parts having opposite circular cross sections, and the joint parts are induction-heated by a hollow cylindrical body with a built-in induction heating coil disposed on the outer peripheral side of the joint parts to join the metal bodies. After that, an inner / outer double tube structure having a length exceeding the length of the hollow cylinder in a standby state at a position away from the hollow cylinder in the axial direction during induction heating and having a cooling medium flow passage inside. The cooling cylinder is inserted between the outer peripheral surface of the metal body and the inner surface of the hollow cylindrical body, and after induction heating by injecting the cooling medium from a plurality of ejection holes arranged on the inner cylinder surface of the cooling cylinder on the metal body side A method for cooling an induction-heated joint, wherein the joint is cooled. A hollow cylindrical body with an induction heating coil is arranged on the outer peripheral side of the joint portion of the metal body having an opposite circular cross section, and a plurality of ejection holes are provided on the inner surface side of the metal body, and a cooling medium supply pipe is connected. A cooling cylinder having an inner and outer double pipe structure having a cooling medium flow path inside is integrally formed by a support rod and a movable element extending from a support attached to the outer peripheral side of the hollow cylinder. to place, the hollow cylindrical body inserted and retractable induction heated joints of the cooling device being characterized in that disposed movably in the axial direction as the inside of the. A hollow cylinder with a built- in induction heating coil is arranged on the outer peripheral side of the joint portion of the metal bodies having opposite circular cross sections, and has a plurality of ejection holes on the inner surface side of the metal body in the axial direction of the hollow cylinder body. Is inserted between the outer periphery of the joint of the metal body and the hollow cylindrical body, the cooling cylinder having an inner and outer double pipe structure having a length exceeding the length of the hollow cylindrical body and having a cooling medium flow passage inside. And a cooling device for a joint part heated by induction, wherein the apparatus is mounted so as to be retractable.   4. The cooling apparatus for an induction-heated joint according to claim 2, wherein the cooling cylinder and the hollow cylindrical body with a built-in induction coil are of a split type.   The cooling apparatus for an induction-heated joint according to claim 3, wherein only the cooling cylinder is a split type.   4. The cooling apparatus for an induction-heated joint according to claim 3, wherein only the hollow cylindrical body having the induction heating coil is of a split type.

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