JP3681475B2 - Method of forced cooling during brazing and brazing apparatus for carrying out the method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
In the present invention, a plurality of blades are assembled into a bowl-shaped casing of a pump impeller mechanism which is a main component of a torque converter for an automatic transmission, and brazed by high-frequency induction heating (high-frequency atmosphere brazing or high-frequency vacuum brazing). The present invention relates to a method for forcibly cooling a pump impeller mechanism (work) and an apparatus therefor.
[0002]
[Prior art]
The pump impeller mechanism that constitutes the main part of the automatic transmission torque converter is disposed so as to connect a bowl-shaped casing, a plurality of blades incorporated in the casing, and upper portions of these blades. And a connecting ring. When brazing the blades to the casing, a work in which a plurality of blades and connecting rings are incorporated in the casing is accommodated in an airtight container and brazed by heating with a high frequency induction heating coil. ing. Conventionally, a spiral-shaped lower heating coil for high-frequency induction heating of the outer lower part of the casing and a spiral-shaped upper heating coil for high-frequency induction heating of the blades and the coupling ring are coupled in series (in series connection). By supplying a high frequency current from one high frequency power source to the coil, the brazing material is heated and melted by high frequency induction, and the brazing material is poured into each joint portion.
[0003]
After brazing in this way, it is efficient and discolored to forcibly cool the pump impeller mechanism after completion of brazing (forced cooling) so that the next workpiece can be brazed immediately. It is also preferable from the viewpoint of prevention. Therefore, conventionally, the forced cooling of the work after brazing the blades to the casing is performed by blowing nitrogen gas having a gas pressure of 6 kg / cm ^{2 to} the work (pump impeller mechanism) as a pressurized gas. It's real.
[0004]
[Problems to be solved by the invention]
However, the conventional forced cooling method and the conventional apparatus for performing the method as described above have the following problems. That is, in the cooling by blowing nitrogen gas at a pressure of 6 kg / cm ² to the workpiece, the cooling rate is slow. For example, it takes about 7.5 minutes to cool the entire workpiece to 200 ° C. or lower. Also, a considerable amount of nitrogen gas (7.8 liters) is consumed per workpiece. In addition, there is a problem that it is difficult to control the deformation amount of the upper end opening and the lower center opening of the casing.
[0005]
The present invention has been made in view of the above-described problems, and its purpose is to rapidly release the heat of the pump impeller mechanism (work) accumulated during brazing heating in a short time. Forcible cooling during brazing and the amount of deformation of the upper end opening and the lower end center opening of the pump impeller mechanism casing can be easily controlled by adjusting the cooling rate at that time To provide an apparatus.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, in the forced cooling method according to the present invention, the lower central portion of the bowl-shaped casing constituting the pump impeller mechanism of the torque converter for automatic transmission is placed on the workpiece receiving jig. In this state, the casing is housed and disposed in a hermetic container as a brazing member, the inside of the hermetic container is maintained in an inert gas atmosphere or a reducing gas atmosphere, or a vacuum, and a plurality of casings are provided in the casing. In the method of forcibly cooling the pump impeller mechanism after brazing the blades by high frequency induction heating, the brazing material is poured into the joint between the casing and the blades assembled to the casing by high frequency induction heating. After brazing, the cooling water is allowed to flow through the cooling water passage provided inside the workpiece receiving jig, so that the inside of the casing is While forcibly cooling the opening portion, the contact member having a cooling water passage therein is brought into contact with the portion corresponding to the opening of the casing, and the cooling water is caused to flow through the cooling water passage of the contact member, The pump impeller mechanism is forcibly cooled.
[0007]
In the forced cooling method according to the present invention, the inside of the airtight container is an inert gas atmosphere or reducing gas atmosphere of 10 ⁻³ Torr or more, or a vacuum.
[0008]
Further, in the forced cooling method according to the present invention, by adjusting the amount of cooling water supplied to the cooling water passages of the work receiving jig and the metal member, respectively, the lower central portion and the annular shape of the bowl-shaped casing are adjusted. The amount of deformation at the upper part is controlled.
[0009]
In the brazing apparatus according to the present invention,
(A) An upper projecting portion for positioning that is inserted and disposed in a lower central opening of a bowl-shaped casing that constitutes a pump impeller mechanism portion of a torque converter for an automatic transmission, and has a cooling water passage inside. A workpiece receiving jig;
(B) The inside is maintained in an inert gas atmosphere, a reducing gas atmosphere, or a vacuum, and the bowl-shaped casing of the pump impeller mechanism is positioned and placed on the workpiece receiving jig. An airtight container accommodated in the interior;
(C) a high frequency induction heating coil for simultaneously high frequency induction heating the casing, a plurality of blades assembled in the casing, and the brazing material;
(D) A brazing member configured to be able to move and come into contact with the annular upper portion of the casing placed on the workpiece receiving jig, and in which a cooling water passage is formed When,
Immediately after pouring the brazing material heated and melted by the high-frequency induction heating coil into the joint between the casing and the blade, cooling water is supplied to the cooling water passages of the workpiece receiving jig and the metal member. The pump impeller mechanism is supplied and forcedly cooled.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described below with reference to the drawings. In the present embodiment, by using the brazing method and apparatus according to the present invention, the manufacture of the pump impeller mechanism 2 that is the main component of the torque converter 1 of the automatic transmission for automobiles (by copper brazing) Assembly process).
[0011]
1 to 3 show an assembled product of a pump impeller mechanism portion (impeller) 2, which has an opening 3 on one end side and a central portion on the other end side. A cup-shaped casing 5 having a central opening 4 at the center, a plurality of (for example, 32) blades 6 of mild steel disposed at equal angular intervals in a circumferential region inside the casing 5, and It is comprised from the connection ring 7 for positioning and reinforcement which connects the upper part of the blade | wing 6 mutually. As shown in FIG. 2, three protrusions 8, 9 and 10 are integrally formed on the blade 6, and one pair of protrusions 8 and 9 is formed at two locations in the radial direction of the casing 5. One end surface 6 a of each blade 6 is disposed in contact with the casing 5 in a state of being engaged with the recessed portions 11 and 12 formed. And the protrusion 10 integrally molded in the intermediate part of the other end surface of the blade 6 is in a state of being inserted and arranged in the hole 13 of the connecting ring 7. Thus, the plurality of blades 6 are positioned at predetermined positions of the casing 5 and are integrally assembled between the casing 5 and the connecting ring 7 (see FIGS. 2 and 3), and the radial direction of the casing 5 Are disposed at a predetermined angle with respect to each other and brazed (see FIG. 1).
[0012]
2 and 3, A is a joint part where the blade 6 and the casing 5 are coupled to each other by copper brazing, and B is a joint where the blade 6 and the connecting ring 7 are coupled to each other by copper brazing. This is the joint part. Although not shown, the drive shaft is integrally coupled to the casing 5 with the opening 4 closed at the center.
[0013]
FIG. 4 shows a brazing device 14 used for brazing by incorporating a plurality of blades 6 into the casing 2 of the pump impeller mechanism portion 2, and shows the brazing device 15 of this example. Thus, the brazing heating device 14 includes a workpiece receiving jig 15 that holds and holds the bowl-shaped casing 5 constituting the pump impeller mechanism portion 2, and an inert gas atmosphere or a reducing gas atmosphere inside, The airtight container 16 that is held in a vacuum and accommodated and disposed in a state where the bowl-shaped casing 5 of the pump impeller mechanism portion 2 is positioned and placed on top of the work receiving jig 15, and the blade 6 are A high-frequency induction heating mechanism 19 including a lower heating coil 17 and an upper heating coil 18 that perform high-frequency induction heating for brazing to the casing 5, and these lower heating coils 1 And it is composed of a supplying high-frequency power source 20 a high-frequency current to the upper heating coil 18.
[0014]
The above-described lower heating coil 17 and upper heating coil 18 are obtained by winding main bodies 17a and 18a corresponding to the plurality of blades 6 in a spiral shape, and as shown in FIG. 17 and 18 are connected in parallel to each other. A high-frequency current is supplied from the high-frequency power supply 20 via the lead portions 17b and 18b of the heating coils 17 and 18. In addition, the lower heating coil 17 and the upper heating coil 18 are supported so as to be movable in the sealed container 16 by a drive cutoff (not shown), and the lower heating coil 17 is included in the outer portion of the casing 5 as described later. The upper heating coil 18 is disposed on the upper portion of the plurality of blades 6 assembled in the casing 5 with respect to the lower portions corresponding to the lower portions corresponding to the blades 6. It is arranged correspondingly with a large gap.
[0015]
Further, in the present example, means for rapidly forcibly cooling the vicinity of the central opening 4 of the casing 5 and the vicinity of the opening 3 of the casing 5 after heating for brazing is provided. . Specifically, as shown in FIGS. 4, 5, and 6, a cooling water passage 22 is provided in the work receiving jig 15, and a water storage tank (not shown) passes through an introduction pipe 23. The cooling water is supplied to the cooling water passage 22 and circulates in the workpiece receiving jig 15, and then is discharged from the discharge pipe 24 to the outside. Thus, the upper portion (mounting table location) 15a of the workpiece receiving jig 15 on which the casing 5 is mounted is rapidly cooled by this cooling water, and as a result, the upper portion of the workpiece receiving jig 15 (work mounting portion). ) The portion near the central opening 4 of the casing 5 in contact with 15a is forcibly cooled.
[0016]
Further, in the airtight container 16, there are three casings for forced cooling of the casing at positions corresponding to the outer peripheral portion 5 a of the annular upper portion of the casing 5 placed on the metal plate 15 a of the workpiece receiving jig 15. A metal plating member 26 is provided. As clearly shown in FIG. 7, these metal plate members 26 are formed in an arc shape (center angle is 120 degrees and cross-sectional shape is rectangular) corresponding to the annular outer peripheral portion corresponding to the opening of the casing 5. As shown in FIG. 4, the cooling water passage 27 is made of a metal having a high thermal conductivity and is connected to the cooling water passage 27 at both ends in the circumferential direction. An introduction pipe 28 and a cooling water discharge pipe 29 are provided (see FIG. 7). Then, the cooling water flows from the reservoir layer (not shown) through the cooling pipes 27 through the introduction pipes 28 and is discharged from the discharge pipe 29 to the outside.
[0017]
Further, one end of a holding rod 30 is attached to the intermediate portion in the circumferential direction of each brazing member 26, and the brazing member 26 is held at a predetermined height position by the holding rod 30. Thus, as the holding rod 30 is driven by a driving device (not shown), the three application members 26 are simultaneously horizontally moved in the radial direction toward the workpiece, and accordingly, the inner members of the application members 26 are moved. As shown in FIG. 8, the peripheral surface 26 a is configured to abut (contact) the outer peripheral portion 5 a and the upper end surface portion 5 b of the annular upper portion of the casing 5. 4 and 6, the portion indicated by α is a contact portion between the workpiece receiving jig 15 and the casing 5, and the portion indicated by an arrow β in FIG. 8 is a contact portion between the contact member 26 and the casing 5. .
[0018]
Cooling after brazing heating of such a pump impeller mechanism is performed according to the following procedure.
[0019]
(1) First, on a casing 5 which is a component of the pump impeller mechanism 2 of the torque converter 1, a plurality of blades 6 on which a copper metal film having a required film thickness is formed in advance are placed at predetermined positions. 5 is assembled in the state where the projections 8 and 9 of the blades 6 are engaged with the recesses 11 and 12, respectively. Thereafter, the connecting ring 7 is disposed at the upper portion of the plurality of blades 6 with the projections 10 of the blades 6 fitted in the holes 13 of the connecting ring 7. As a result, the plurality of blades 6 are assembled in a state of being positioned between the casing 5 and the connecting ring 7 to obtain an assembly S (see FIG. 2).
[0020]
(2) Next, the assembly (workpiece) S is accommodated in a sealed container (not shown) (for example, in an inert gas atmosphere or reducing gas atmosphere of 10 ⁻³ Torr or more, or in a vacuum) and is shown in FIG. As shown in the drawing, the workpiece is placed on the metal plate 15a of the workpiece receiving jig 15, and the upper heating coil 18 is arranged on the upper portion of the connecting ring 7 with a slight space therebetween, and the lower heating coil 17 corresponds to the blade 6. The blade 5, the connecting ring 7, and the casing 5, which are brazed members, are arranged at a predetermined interval between the coils 16 and 17.
[0021]
(3) Next, after closing the lid of the sealed container and evacuating the sealed container to a predetermined pressure with a vacuum pump, the inside of the sealed container is replaced with, for example, a mixed gas of nitrogen and hydrogen to obtain a required pressure.
[0022]
(4) Under this state, a high-frequency current having a required frequency is supplied from the high-frequency power source 20 to the lower and upper heating coils 17 and 18, whereby the casing 5, the plurality of blades 6 and the connection ring 7 are simultaneously subjected to high-frequency induction heating. To a predetermined brazing temperature. Along with this, a copper metal film formed in advance on the surface of the blade 6 is heated and melted and flows on the surface of the blade 6 in both the upper and lower directions (downward is the gravity and the capillary of the gap portion of the joint portion A). 9), the brazing material made of the copper material M gathers at both the joint portions A and B as shown in FIG. Then, the molten copper material M flows into the gap of the joint portion A between the blade 6 and the casing 5 as a brazing material, and the brazing material is placed in the annular region of the corner formed by the blade 6 and the casing 5. As a result, a raised portion 40a is formed. On the other hand, the molten copper material M flows as a brazing material into the gap of the joint portion B between the blade 6 and the connecting ring 7, and the brazing material is formed in the annular region of the corner formed by the blade 6 and the connecting ring 7. The raised portion 40b is formed. These raised portions 40a and 40b serve as extra-score (reinforcement).
[0023]
(5) After maintaining a predetermined brazing temperature state for a required time, energization of the coils 17 and 18 is stopped, and induction heating is terminated.
[0024]
(6) After induction cooling to about 1200 ° C. and natural cooling to the melting temperature of the brazing filler metal (copper) (1084.5 ° C. in the case of copper), the holding rod 30 is moved by operating a driving device (not shown). Then, the three metal plate members 26 are horizontally moved toward the casing 5 on the workpiece receiving jig 15 so that the inner peripheral surface 26a of the metal plate member 26 is brought into contact with the outer peripheral portion 5a of the upper peripheral surface of the casing. Immediately after that, cooling water is supplied to the cooling water passage 22 inside the workpiece receiving jig 15 from the introduction pipe 23 so as to pass the water, and at the same time, the cooling water passage 27 inside the contact member 26 is introduced into the cooling water passage 27. Cooling water is supplied from the introduction pipe 28 to make the inside of the water flow. The cooling water supplied to the cooling water passages 22 and 27 is discharged through the discharge pipes 24 and 29, respectively. At this time, the cooling water flowing inside the workpiece receiving jig 15 and the metal member 26 takes away the heat around it, and therefore the heated workpiece (particularly the casing 5) is rapidly cooled by the endothermic action of the cooling water. It becomes.
[0025]
That is, by passing water through the cooling water passage 22 inside the work receiving jig 15 after the brazing addition heat is finished, the work portion near the lower central opening 4 of the casing 5 is applied to the casing 5 and the work receiving jig 15. The heat is dissipated through the contact portion α with the portion 15a, rapidly forcibly cooled, and contracted. At the same time, the work portion in the vicinity of the upper end opening 3 of the casing 5 is made to flow through the cooling water passage 27 inside the metal member 26 that is in contact with the portion corresponding to the upper end opening 3 of the casing 5. Rapidly forcibly cooled, and therefore starts to shrink from the vicinity of the upper end opening 24 of the casing 5 and moves away from the metal brazing member 26, but a tracking mechanism (not shown) is provided in the horizontal movement mechanism. The sheet metal member 7 is cooled and contracted while being always in contact with the workpiece.
[0026]
(7) In this way, after the induction heating is completed, the work (pump impeller mechanism 2) is forcibly cooled rapidly to a required temperature (for example, 200 ° C. or less). Thereafter, the water flow to the cooling water passages 22 and 27 is stopped, and the three stopper members 26 disposed on the outer peripheral portion 5a of the upper end peripheral surface of the casing 5 are horizontally moved to the original position. return.
[0027]
(8) Thereafter, the vacuum pump is stopped, and the assembled pump impeller mechanism 2 is taken out from the sealed container.
[0028]
By the above procedure, the workpiece is rapidly cooled after heating, and good brazing is performed in a short cycle.
[0029]
Hereinafter, specific processing conditions of the above embodiment will be described.
Specific examples of processing conditions (1) Dimensions of pump impeller mechanism <A> Casing outer diameter: 260 mm
Casing height: 65 mm
<I> Number of blades: 32 sheets (2) Coating conditions for blades <A> Coating method (coating method): Copper plating method <I> Coating thickness (film thickness): 50 [mu] m
(3) High frequency induction heating conditions <A> Frequency: 7KHz
<I> Output: 160KW
<C> Heating time: 25 seconds <D> Holding time: 15 seconds <O> Cooling time: 10 seconds <F> Heating temperature: 1200 ° C.
(4) Atmosphere conditions in an airtight container <A> Replacement gas during heating: Nitrogen + carbon monoxide (10%)
<I> Heating pressure: 10 Torr
<U> Cooling pressure: 10 Torr (nitrogen)
(5) cooling conditions <A> cooling start temperature: copper melting temperature (1,084.5 ° C.) near <b> supply pressure of the cooling water: 3.5 kg / cm ²
<C> Flow rate of the cooling water passage of the contact member: 90 l / min
<D> Flow rate of cooling water passage of workpiece receiving jig: 40 l / min
<O> Material of the contact member and workpiece receiving member: Copper material [0030]
By brazing in accordance with the above processing procedure according to the above processing conditions, the cooling rate of the workpiece after brazing to 200 ° C. (the temperature at which the workpiece hardly discolors even when exposed to the atmosphere) is about 1 minute, that is, about 1 of the conventional one. In addition, all of the 32 blades 6 were firmly brazed to the casing 5, and the dimensions of the upper opening 3 and the lower central opening 4 of the casing 5 were almost the same as before heating.
[0031]
According to such a method and apparatus of this example, after brazing by high-frequency induction heating, water is passed through the cooling water passages inside the workpiece receiving jig 15 and the brazing member 26, respectively. The heat of the work (pump impeller mechanism portion 2) accumulated at this time is rapidly propagated toward the work receiving jig 15 and the metal fitting member 26 and absorbed by the cooling water flowing through the work receiving jig 15, and the cooling member 26. It will be carried away with water. Therefore, the cooling rate of the workpiece is sufficiently high, and can be set to a temperature of 200 ° C. or less (a temperature at which discoloration does not occur even if the workpiece is taken out from the airtight container 16 and exposed to the atmosphere) within a short time. The amount of deformation of the upper end opening 3 and the lower center opening 4 of the casing 5 after cooling is adjusted by appropriately adjusting the flow rate of cooling water flowing through the work receiving jig 15 and the metal plate member 26, thereby cooling the work. Can be arbitrarily set, and the deformation amount of the workpiece can be controlled in accordance with the flow rate setting.
[0032]
Although one embodiment of the present invention has been described above, the present invention is not limited to this embodiment, and various modifications and changes can be made based on the technical idea of the present invention. For example, the shape of the workpiece receiving jig 15 and the route of the cooling water passage 22 inside the workpiece receiving jig 15 can be changed as necessary. Further, the cross-sectional shape and the like of the abutting member 26 can be changed as necessary. Further, it is not necessary to be a three-part dividing type as in the above-described embodiment, and it is a two-part or four-part or more part. May be. In the above-described embodiment, the contact member 26 is brought into contact with the outer peripheral portion 5a of the annular upper portion corresponding to the opening 3 of the casing 5, but the annular shape corresponding to the opening 3 of the casing 5 is used. A configuration in which the contact member 26 is brought into contact with the inner peripheral portion of the upper portion can also be employed.
[0033]
In the above-described embodiment, the workpiece is forcibly cooled only by water cooling. However, in order to shorten the cooling time of the workpiece, it is also possible to perform gas injection cooling in addition to this water cooling. It is.
[0034]
【The invention's effect】
As described above, according to the present invention, after performing brazing by high-frequency induction heating, the cooling water is caused to flow through the cooling water passage provided in the workpiece receiving jig, thereby opening the central opening of the casing of the pump impeller mechanism portion. A pump impeller mechanism is provided by forcibly cooling the part and bringing a metal member having a cooling water passage inside into contact with the part corresponding to the opening of the casing and allowing the cooling water to flow through the cooling water passage of the metal member. Since the part (work) is forcibly cooled, the heat (work heat) accumulated in the pump impeller mechanism by brazing heating is rapidly propagated toward the work receiving jig and the metal member. The heat obtained by the workpiece receiving jig and the metal member is absorbed by the cooling water and carried away with the cooling water. Therefore, the cooling speed of the entire pump impeller mechanism is increased, and can be reduced to, for example, 200 ° C. or less in a short time, so that the efficiency of the brazing operation can be improved. Further, the deformation amount of the central opening portion and the opening portion of the casing of the pump impeller mechanism section is adjusted by adjusting the flow rate per unit time of the cooling water flowing through the cooling water passages inside the work receiving jig and the metal fitting member. By changing the cooling rate of the entire pump impeller mechanism, it can be easily controlled, and a high-quality high-frequency brazed product (pump impeller mechanism as a product) can be obtained in a short cycle time. . In addition, according to the present invention, no auxiliary material such as an inert gas is required for cooling the workpiece, which is very practical and extremely useful in the industry.
[Brief description of the drawings]
FIG. 1 is a plan view showing a pump impeller mechanism portion of a torque converter that is brazed by a brazing method according to the present invention.
FIG. 2 is an enlarged sectional view taken along line XX in FIG.
FIG. 3 is an enlarged cross-sectional view taken along line YY in FIG.
FIG. 4 is a sectional view of an apparatus for brazing the blades of the pump impeller mechanism by high frequency induction heating.
FIG. 5 is a plan view of a workpiece receiving jig.
6 is a cross-sectional view taken along line ZZ in FIG.
FIG. 7 is a plan view of a three-part splitting member.
8 is a cross-sectional view taken along line RR in FIG.
FIG. 9 is a cross-sectional view showing a state where blades are brazed.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Torque converter 2 Pump impeller mechanism part 3 Opening opening 4 Center opening 5 Casing 5a Outer peripheral part 5b Upper end surface part 6 Blade | wing 7 as a to-be-brazed member Connection ring 14 Brazing apparatus 15 Work receiving jig 15a Batting part 16 Airtightness Vessel 17 Upper heating coil 18 Lower heating coil 22 Cooling water passage 26 Brazing member 27 Cooling water passages A and B

Claims (4)

Under the state where the lower center portion of the bowl-shaped casing constituting the pump impeller mechanism portion of the torque converter for automatic transmission is placed on the work receiving jig, this casing is used as a brazing member in an airtight container. The pump impeller mechanism is forcibly cooled after it is housed and held in an airtight container or an inert gas atmosphere or a reducing gas atmosphere or vacuum, and a plurality of blades are brazed by high frequency induction heating in the casing. In this method, the casing and the blades attached to the casing are induction-heated by high frequency induction, and brazing is performed by pouring a brazing material into a joint portion between the casing and the blade. By flowing the cooling water through the cooling water passage, the central hole portion of the casing is forcibly cooled and the cooling water passage is provided inside. During brazing, the pump impeller mechanism is forcibly cooled by bringing a gold member into contact with a portion corresponding to the opening of the casing and allowing cooling water to flow through the cooling water passage of the metal member. Forced cooling method. The forced cooling method during brazing according to claim 1, wherein the inside of the airtight container is an inert gas atmosphere or a reducing gas atmosphere of 10 ⁻³ Torr or more, or a vacuum. The amount of deformation of the lower central portion and the annular upper portion of the bowl-shaped casing is controlled by adjusting the amount of cooling water supplied to the cooling water passages of the workpiece receiving jig and the metal member, respectively. The cooling method at the time of brazing according to claim 1 or 2. (A) Workpiece having a positioning upper projecting portion inserted into a lower central opening of a bowl-shaped casing constituting a pump impeller mechanism portion of an automatic transmission torque converter, and having a cooling water passage inside A receiving jig;
(B) The inside is maintained in an inert gas atmosphere, a reducing gas atmosphere, or a vacuum, and the bowl-shaped casing of the pump impeller mechanism is positioned and placed on the workpiece receiving jig. An airtight container accommodated in the interior;
(C) a high frequency induction heating coil for simultaneously high frequency induction heating the casing, a plurality of blades assembled in the casing, and the brazing material;
(D) A brazing member configured to be able to move and come into contact with the annular upper portion of the casing placed on the workpiece receiving jig, and in which a cooling water passage is formed When,
Immediately after pouring the brazing material heated and melted by the high frequency induction heating coil into the joint between the casing and the blade, cooling water is supplied to the cooling water passages of the work receiving jig and the metal member. For brazing the pump impeller mechanism.

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