JPH1027683A - Method and device for high frequency induction heating of wax material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and surely perform uniform heating of a casing, blade and connecting ring, in its turn, wax material in a pump impeller mechanism part by a single high frequency power source. SOLUTION: In an outer side lower surface part 5a of a casing 5 corresponding to a plurality of blades 6, a volute lower part heating coil 17 is arranged to be opposed, also in an upper position of the blade 6 and a connecting ring 7, in a position corresponding to an inner side lower surface part 5b of the casing 5, a volute upper part heating coil 18 is arranged to be opposed, these lower/upper part heating coils 17, 18 are connected in parallel to each other, to these parallelly connected lower/upper part heating coils 17, 18, by supplying a high frequency current from a single high frequency power source 22, in the case of heating a wax material fused, by distributing an output to the lower/ upper part heating coils 17, 18, a respective heating speed by both these coils 17, 18 is regulated so as to be equal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high frequency induction heating of a brazing material used for high frequency brazing by assembling a plurality of blades to a pump impeller mechanism which is a main component of a torque converter for an automatic transmission. The present invention relates to a method and a high-frequency induction heating device.

[0002]

2. Description of the Related Art A pump impeller mechanism constituting a main part of a torque converter for an automatic transmission includes a bowl-shaped casing, a plurality of blades incorporated in the casing,
A connection ring is provided so as to connect the upper portions of these blades to each other. In brazing the blades to the casing, a work (pump impeller mechanism) incorporating a plurality of blades and a connection ring in the casing is placed in an airtight container and heated by a high-frequency induction heating coil. I try to braze. Conventionally, a spiral lower heating coil for high-frequency induction heating of the outer lower portion of the casing and a spiral upper heating coil for high-frequency induction heating of the blades and the connection ring are connected in series (series connection). By supplying a high-frequency current from one high-frequency power supply to the coil, the brazing material is heated and melted by high-frequency induction so that the brazing material is poured into each joint.

In the case of high-frequency brazing of a member having a complicated shape, a plurality of high-frequency power sources may be used in order to uniformly and uniformly heat a work depending on the shape of the brazing member. That is, as a method of high-frequency induction heating of a pump impeller mechanism (work) for brazing, as described above, the lower heating coil and the upper heating coil are connected in series, and a high-frequency current is supplied to these heating coils from a high-frequency power supply. And inductively heating the work with a single power supply is often used. However, if this does not allow balanced and uniform heating, the lower heating coil and the upper heating coil are coupled to separate high-frequency power sources,
A method may be used in which a high-frequency current is supplied from each high-frequency power supply to each heating coil and the workpiece is induction-heated by two or more power supplies.

[0004]

However, the above-described conventional high-frequency induction heating method for brazing material and the apparatus therefor have the following problems. First, in order to perform ideal brazing, high-frequency induction heating must be performed on the casing, blades, and connecting ring that constitute the pump impeller mechanism at the same heating rate, but these members have significantly different heat capacities. Therefore, it is necessary to appropriately determine the arrangement position of each coil according to each heat capacity. Specifically, the interval between the casing and the lower heating coil is set to an appropriate predetermined interval, while the interval between the blades and the connection ring and the upper heating coil has a light load on the work portion, so that the coupling between them is improved. In order to achieve this, the interval must be set smaller than the predetermined interval. However, when the distance between the blade and the connection ring and the upper heating coil is reduced, a temperature difference occurs between the work portion facing the winding portion of the spiral upper heating coil and the other work portion, and the blades have a lower temperature. In addition, the connection ring is heated unevenly. And, due to this, the brazing material also flows in a non-uniform manner, resulting in a large influence on the deformation of the blade after brazing.

In the heating by the dual power supply / upper / lower heating coil independent method, the upper and lower heating coils are arranged with an appropriate gap between the bowl-shaped casing, the blades and the core member, and the output to the upper and lower heating coils is controlled. By adjusting, uniform heating can be easily performed. However, in the case of this system, additional equipment (such as a high-frequency power supply) is required twice as much as one power supply system. Therefore, there is a problem that the initial cost of the equipment is high and the floor area occupied by the equipment is large.

The present invention has been made in view of such various problems, and an object of the present invention is to provide a single high-frequency power supply for uniformizing the casing, blades, connecting rings and brazing material of a pump impeller mechanism. An object of the present invention is to provide a high-frequency induction heating method and a high-frequency induction heating apparatus for a brazing material capable of performing heating easily and reliably.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, a method according to the present invention uses an automatic transmission in an airtight container maintained in an inert gas atmosphere, a reducing gas atmosphere, or a vacuum. A bowl-shaped casing constituting a pump impeller mechanism of the torque converter is housed and arranged as a brazing member, and the brazing material is heated and melted by high-frequency induction heating, so that the casing and a plurality of blades incorporated in the casing. And a joint portion between the plurality of blades and a connecting ring connecting the upper portions of the blades to each other, and performing a brazing process. A spiral lower heating coil is disposed on the outer lower surface of the casing so as to face the casing, and the casing is located above the blades and the connecting ring. A spiral upper heating coil is opposed to a position corresponding to an inner lower surface portion of the coil, and the lower heating coil and the upper heating coil are connected in parallel with each other. The lower heating coil and the upper heating coil connected in parallel When performing the melting and heating of the brazing material by supplying a high frequency power to the lower heating coil and the upper heating coil when performing the melting and heating of the brazing material by supplying a high frequency current from one high frequency power supply By distributing the output, adjustment is made so that the respective heating rates by these two coils become the same.

Further, in the method according to the present invention, the power distribution to the lower heating coil and the upper heating coil is determined by determining a current branch point of a parallel circuit formed by connecting these heating coils in parallel, and An adjustment coil is connected between the heating coil and one end of the heating coil.

Further, in the method according to the present invention, the ratio of the output distribution to the lower heating coil and the lower heating coil is set in accordance with the value of the inductance of the adjustment coil, so that each part of the pump impeller mechanism is formed. The heating temperature distribution is adjusted.

In the apparatus according to the present invention, (A) a work receiving jig for mounting and holding a bowl-shaped casing constituting a pump impeller mechanism of a torque converter for an automatic transmission; An inert gas atmosphere, a reducing gas atmosphere, or a vacuum is maintained, and a bowl-shaped casing of the pump impeller mechanism is housed and disposed inside the work receiving jig while being positioned and mounted on the work receiving jig. (C) a spiral lower heating coil disposed opposite to an outer lower surface portion of the casing corresponding to the plurality of blades assembled inside the casing, the plurality of blades, and the plurality of blades. At the upper position of the connection ring connecting the upper portions to each other, the spiral upper heating coil arranged opposite to the inner lower surface portion of the casing is connected in parallel with each other. (D) an adjusting coil for adjusting inductance connected in series to the upper heating coil, (E) a lower heating coil, and a series circuit of the upper heating coil and the adjusting coil. A high-frequency power supply for supplying a high-frequency current to a parallel circuit connected in parallel, and supplying the high-frequency current to the parallel circuit from the high-frequency power supply, thereby simultaneously causing the casing and the plurality of blades to be simultaneously driven from both upper and lower directions. The brazing material is heated and melted by induction heating.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a high-frequency induction heating method for a brazing material and an embodiment of the high-frequency induction heating apparatus according to the present invention will be described below with reference to the drawings. In this embodiment, the torque converter 1 for an automatic transmission of an automobile is used by using the brazing method and the brazing method according to the present invention.
(Copper brazing) of the pump impeller mechanism 2, which is a main component of the above.

FIGS. 1 to 3 show a completed assembly of a pump impeller mechanism (impeller) 2. This pump impeller mechanism 2 has an opening 3 at one end and another end. And a plurality of mild steel sheets (e.g., 3) arranged at equal angular intervals in a circumferential area inside the casing 5.
(2) blades 6 and a connection ring 7 for positioning and reinforcing which connects the upper portions of the blades 6 to each other. As shown in FIG. 2, three projections 8, 9 and 10 are integrally formed on the above-mentioned blade 6, and a pair of projections 8, 9 on one side of these are formed at two locations in the radial direction of the casing 5. One end surface 6 a of each blade 6 is arranged in contact with the casing 5 in a state of being engaged with the recessed portions 11 and 12, respectively. Then, a projection 10 integrally formed at an intermediate portion of the other end surface of the blade 6 is provided with the hole 1 of the connection ring 7.
3, respectively. Thereby, the plurality of blades 6 are positioned at predetermined positions of the casing 5 and are integrally assembled between the casing 5 and the connection ring 7 (see FIGS. 2 and 3), and the radial direction of the casing 5 Are arranged at equal intervals in a state of being inclined at a predetermined angle and brazed (see FIG. 1).

In FIGS. 2 and 3, A is the blade 6
And a casing 5 are joined together by copper brazing, and B is a joint where the blade 6 and the connecting ring 7 are joined together by copper brazing. Although not shown, a drive shaft is integrally connected to the casing 5 at a central position with the opening 4 closed.

FIG. 4 shows a high-frequency induction heating apparatus 14 for brazing material used for brazing by incorporating a plurality of blades 6 in the casing 5 of the pump impeller mechanism 2. As shown in FIG. 4, the high-frequency induction heating device 14 of this embodiment includes a work receiving jig 15 for mounting and holding a bowl-shaped casing 5 constituting the pump impeller mechanism 2.
And the inside is an inert gas atmosphere or a reducing gas atmosphere,
Alternatively, an airtight container 16 which is held in a vacuum and is accommodated and arranged in the state where the bowl-shaped casing 5 of the pump impeller mechanism 2 is positioned and placed on the upper part of the work receiving jig 15, A spiral lower heating coil 17 disposed opposite to the outer lower surface 5a of the casing 5 so as to correspond to the plurality of blades 6 installed therein, the plurality of blades 6 and the upper portions of these blades 6 are connected to each other. A spiral upper heating coil 1 that is arranged above the connecting ring 7 so as to face the inner lower surface portion 5b of the casing 5.
8 are connected in parallel with each other, an adjusting coil 20 for adjusting the inductance connected in series to the upper heating coil 18, a lower heating coil 17,
A high-frequency power supply 22 for supplying a high-frequency current to a parallel circuit 21 including the upper heating coil 18 and the adjustment coil 20 is provided.

As shown in FIG. 5, the lower heating coil 17 and the upper heating coil 18 are each formed by spirally winding a copper pipe material in accordance with a work shape (arrangement shape of a plurality of blades 6). It has main bodies 17a and 18a, and leads 17b and 18b on one end side of the main bodies 17a and 18a are connected to each other at a current branch point α. The other end of the main body portion 17a of the lower heating coil 17 is connected to the current branch point β via a lead portion 17c, while the other end of the main body portion 18a of the upper heating coil 18 is connected to the adjustment coil via the lead portion 18c. 20 is connected to one intermediate tap 24 of the
Is connected to the current branch point β. Thus, the upper heating coil 18 and the adjustment coil 20 are connected in series with each other, and the series circuit 25 including the upper heating coil 18 and the adjustment coil 20 is connected in parallel to the lower heating coil 17 to form a parallel circuit 21. . Thereby, the lower heating coil 17 and the upper heating coil 18 are connected in parallel, and the adjusting inductance adjusting coil 20 is inserted into the lead portion 18c between the other end of the upper heating coil 18 and the current branch point β. The arrangement is arranged. The adjusting coil 20 is provided with a plurality of intermediate taps 24 as shown in FIG. 4, and by selecting the intermediate tap 24 connected to the other end of the upper heating coil 18 from these, the adjusting coil 20 is provided. The inductance of itself, and thus the total impedance of the series circuit 25 forming one path of the parallel circuit 21, can be changed as appropriate (see FIGS. 4 and 5).

Further, a high-frequency power supply 22 is connected between the current branch points α and β, and a high-frequency current is supplied from the high-frequency power supply 22 to the parallel circuit 21 so that the coils 17, 18 and 20 The lower heating coil 17 and the upper heating coil 18 at a predetermined distribution ratio according to the inductance.
A high-frequency current is caused to flow therethrough. That is,
The high frequency output from the high frequency power supply 22
It is configured to be distributed to the lower heating coil 17 and the upper heating coil 18 at a predetermined ratio according to the inductances of 8, 20.

Further, the lower heating coil 17 and the upper heating coil 18 are movably supported in the hermetic container 16 by a drive cut-off (not shown), and the lower heating coil 17 is connected to the casing 5 as described later. A plurality of blades 6 of which the upper heating coil 18 is mounted in the casing 5 are arranged corresponding to a lower portion (outer lower surface portion 5a) corresponding to the blade 6 of the outer portion with a slight gap therebetween. The upper part of the connecting ring 7 is arranged at a position separated from the connecting ring 7 by a slight gap, corresponding to the inner lower surface portion 5b of the casing 5.

Next, a procedure for performing high-frequency copper brazing using the high-frequency induction heating apparatus 14 having the above-described configuration will be described.

(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 in which a copper metal coating of a required thickness is formed in advance as a brazing material are placed at predetermined positions. And the projections 8 and 9 of each blade 6 are engaged with the recesses 11 and 12 of the casing 5 respectively. Thereafter, the connection ring 7 is arranged at the upper part of the plurality of blades 6 with the protrusions 10 of the respective blades 6 fitted in the holes 13 of the connection ring 7. Thereby, the plurality of blades 6 are connected to the casing 5 and the connection ring 7.
The assembly S (FIG. 2)
See).

(2) Next, the assembly (work) S is housed in an airtight container (not shown) (for example, in an inert gas atmosphere or a reducing gas atmosphere of 10 ^-3 Torr or more, or in a vacuum). As shown in FIG. 4, the lower heating coil 17 is placed on the work receiving jig 15, and the lower heating coil 17 is opposed to the outer lower surface portion 5 a of the casing 5 corresponding to the blade 6 at a small interval, whereby The brazing member 6, the connecting ring 7 and the casing 5, which are members to be brazed, are arranged at predetermined intervals between the coils 16 and 17, and the upper heating coil 18 is placed at a position slightly above the connecting ring 7. It is arranged to face the inner lower surface portion 5b of the casing 5 so as to correspond thereto.

(3) Next, the lid of the airtight container is closed,
After the inside of the hermetic container is evacuated to a predetermined pressure by a vacuum pump, the inside of the hermetic container is replaced with, for example, a mixed gas of nitrogen and hydrogen to obtain a required pressure.

(4) Under this condition, the high-frequency power supply 22
A high-frequency current of a required frequency is supplied to the upper and lower heating coils 17 and 19 from this, so that the casing 5, the plurality of blades 6 and the connecting ring 7 are simultaneously subjected to high-frequency induction heating to a predetermined brazing temperature. Along with this, the copper metal coating previously formed on the surface of the blade 6 is heated and melted and flows upward and downward on the surface of the blade 6 (downward due to gravity and the capillary in the void portion of the joint A). By the action and upward by the capillary action of the gap portion of the joint B), the brazing material made of the copper material M gathers at both the joints A and B as shown in FIG. Then, the copper material M in a molten state flows as a brazing material into the gap of the joint portion A between the blade 6 and the casing 5, and the brazing material is provided in the annular annular region of the corner formed by the blade 6 and the casing 5. 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 enters the annular annular region of the corner formed by the blade 6 and the connecting ring 7. The raised portion 40b is formed. These bulges 40
The a and 40b function as extra (reinforcement).

(5) After maintaining the predetermined brazing temperature state for a required time, the power supply to both the coils 17 and 18 is stopped, and the induction heating is terminated.

(6) After the induction heating is completed in this manner, the work (pump impeller mechanism 2) is allowed to cool to a required temperature, and then nitrogen gas at a predetermined pressure is blown onto the work to obtain the required temperature (for example, Cool down to below 200 ° C).

(7) After the induction heating is completed in this way, the work (pump impeller mechanism 2) is rapidly and forcibly cooled to a required temperature (for example, 200 ° C. or lower).

(8) Thereafter, the vacuum pump is stopped, and the pump impeller mechanism 2 that has been assembled is taken out of the airtight container.

High-frequency induction heating apparatus 1 for brazing material of this embodiment
By performing the brazing operation according to the procedure described above using No. 4, good copper brazing can be performed. Such good copper brazing can be performed by inserting the adjustment coil 20 for inductance adjustment into the lead portion 18c of the upper heating coil 18 as described above, and Heating coil 1
This is because the output distribution (energy distribution) to the upper heating coil 17 and the lower heating coil 18 is appropriately adjusted by adjusting the value of the total inductance of the series circuit 25 including the control coil 8 and the adjustment coil 20. .

Such a structure, that is, the upper heating coil 1
The reason why the unique configuration in which the adjustment coil 20 is connected in series to the configuration 7 is adopted will be described in detail below. That is, the blade 6 that is induction-heated by the upper heating coil 17
The heat capacity of the connecting ring 7 and that of the casing 5 that is induction-heated by the lower heating coil 18 are significantly different, and the weight of the casing 5 is 84% of the total weight, and the weight of the blade 6 and the connecting ring 7 is 16%. The blade 6 and the connecting ring 7 are made of a thin copper plate. In particular, the blade 6 is disposed perpendicularly to the bottom of the casing 5 in the direction of the center of the workpiece, and the winding direction of the spiral main body 18 a of the upper heating coil 18. Are arranged at equal intervals in the circumferential direction of the work at an angle close to perpendicular to the main body 18 of the upper heating coil 18.
The electric connection between the upper heating coil 18 and the upper part of the work is not good, in combination with the light load on the upper part of the work (pump impeller mechanism 2) in which a is disposed opposite to the work. Therefore, even if the energy corresponding to the work weight ratio is supplied to the upper heating coil 18, the heating temperature of the blade 6 and the connecting ring 7 when the casing 5 reaches the required temperature for a predetermined time does not reach the required temperature. Things happen.

Therefore, simply connecting the lower heating coil 17 and the upper heating coil 18 having inductances corresponding to the lower part and the upper part of the work in parallel does not heat the entire work to a uniform temperature. That is, even when the lower heating coil 17 and the upper heating coil 18 are arranged with an appropriate gap with respect to the workpiece and induction heating is performed, the members of the casing 5, the blades 6, and the connection ring 7 are heated, but the temperature rises at that time. The temperature speed of the casing 5 alone is relatively high, and the temperature of the blade 6 and the connecting ring 7 is relatively low, so that a temperature difference occurs between them. To eliminate this temperature difference, it is necessary to improve the electrical coupling of the upper heating coil 18 to the work. One of the measures is to reduce the gap between the upper heating coil 18 and the work. However, in this case, as the gap between the upper heating coil 18 and the work is reduced,
A work portion corresponding to the wound coil portion of the main body portion 17a of the upper heating coil 17, and a work portion corresponding to a portion between the adjacent wound coil portions (a work portion not corresponding to the wound coil of the main body portion 17a); A temperature difference occurs between the two. Therefore, the blade 6 and the connection ring 7 are heated unevenly. Then, due to this, the brazing material also flows in a non-uniform manner, which greatly affects the deformation of the blade 6 after brazing. Under such circumstances, in order to uniformly heat the work under a state in which the lower heating coil 17 and the upper heating coil 18 are arranged with an appropriate gap with respect to the work, the casing 5, the blades 6, and the connection ring 7 must be connected to each other. It is necessary to appropriately control the distribution ratio of electric power (energy) to the lower heating coil 17 and the upper heating coil 18 for induction heating. For this purpose, the power distribution to the upper heating coil 18 is maintained as it is, and the power distribution to the lower heating coil 17 is relatively reduced, so that the temperature rise rate on the casing 5 side is reduced, and the blades 6 and It is conceivable to approach the temperature rising speed of the connecting ring 7.

Therefore, in the present embodiment, two parallel circuits each composed of the lower heating coil 17 and the upper heating coil 18 are used.
Of the two current paths, an adjustment coil (so-called dummy coil) 20 for inductance adjustment is inserted and arranged in the current path on the side where the upper heating coil 18 is provided, and the upper heating coil 18 and the adjustment coil 20 are connected in series. It is configured to connect. By adopting such a configuration,
The output distribution (energy distribution) to the lower heating coil 17 and the upper heating coil 18 is appropriately adjusted. More specifically, in this case, by connecting the adjusting coil 20 to the upper heating coil 18 side, the temperature rising rate of the casing 5 by the lower heating coil 17 is reduced accordingly, and Heating coil 1
The heating speed of the blade 6 and the connecting ring 7 by the nozzle 8 can be made close to each other. As a result, uniform heating can be performed on both the upper and lower parts of the work.

Therefore, according to the method of the present embodiment, by providing the adjusting coil 20, the casing 5
And a joint between the plurality of blades 6 and the plurality of blades 6
It is possible to easily and uniformly heat the joint portion between the joint member and the connecting ring 7, and to uniformly heat and melt the brazing material, thereby enabling good brazing.

Next, the measurement results of the inductance and resistance of the lower and upper heating coils 17 and 18 and the adjustment coil 20 in this embodiment will be described.

[0033]

[Table 1]

The results of the power distribution to the upper heating coil and the lower heating coil calculated from the inductance and resistance measurement results are shown.

[0035]

[Table 2]

Next, the work weight will be described.

[0037]

[Table 3]

As is clear from the result of the above-described power distribution and the work weight ratio, the total weight of the blades 6 and the connecting ring 7 occupies 16% of the total work weight, but the heating output is 2% of the total output.
Requires 2%. This consists of the blade 6 and the connecting ring 7
Is usually composed of a thin copper plate having a thickness of about 1.2 mm,
In particular, the blades 6 are arranged on the casing 5 perpendicularly to the center of the work with respect to the bottom, and are arranged at equal intervals in the circumferential direction of the work at an angle close to perpendicular to the winding direction of the spiral upper heating coil 18. Therefore, the electric connection with the upper heating coil 18 is not good together with the light load.

Hereinafter, specific processing conditions of this 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 <A> Number of blades: 32 (2) Blade forming conditions <A> Coating formation Method (coating method): Copper plating method <a> Film thickness (film thickness): 50 μm (3) High-frequency induction heating condition <a> Frequency: 7 KHz <a> Output: 160 KW <c> Heating time: 25 seconds < D) Holding time: 15 seconds <e> 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% <a> Pressure during heating: 10 Torr <c> Pressurized gas during cooling: nitrogen <d> Pressurized gas pressure during cooling: 6 kg / cm ² Under these processing conditions, brazing is performed according to the above processing procedure. Thus, all of the 32 blades 6 were firmly brazed to casing 5.

The 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 magnitudes of the inductance value and the resistance value of the lower heating coil 17, the upper heating coil 18, and the adjustment coil 20 as described above are merely examples, and are not limited thereto. The inductance value of the adjusting coil 20 is selected by appropriately selecting any one of the plurality of connection taps 40 (see FIG. 5) of the adjusting coil 20 in consideration of the difference in the weight ratio and the material of the upper heating coil 18 work. By appropriately setting, it is possible to perform uniform heating of the workpiece by changing the output distribution.

[0041]

As described above, in the brazing method according to the present invention, the spiral lower heating coil is disposed to face the outer lower surface of the casing corresponding to the plurality of blades, and the upper position of the blade and the connection ring , A spiral upper heating coil is opposed to a position corresponding to the inner lower surface portion of the casing, and the lower heating coil and the upper heating coil are connected in parallel with each other. When the brazing material is melted and heated by supplying a high-frequency current from one high-frequency power supply to the coils, the heating rates of the two heating coils are equalized by distributing the power to the lower heating coil and the upper heating coil. The work (pump impeller mechanism) is controlled by a single power supply system. Can of performing uniform heating in the heating power according to the load, it is possible to good brazing.
Furthermore, since the single power source system is sufficient, the initial cost of the equipment is low, the floor area of the equipment is small, and the work space is small, so that the present invention is industrially useful.
Further, according to the apparatus for carrying out the method of the present invention, the work of the work can be performed by a simple configuration in which the adjustment coil for adjusting the inductance of the parallel circuit formed by connecting the lower heating coil and the upper heating coil in parallel is simply inserted. Since uniform heating can be achieved, it is simple and very practical in terms of configuration, in combination with the need for a single power supply.

[Brief description of the drawings]

FIG. 1 is a plan view showing a pump impeller mechanism of a torque converter.

FIG. 2 is an enlarged sectional view taken along line XX in FIG.

FIG. 3 is an enlarged sectional view taken along line YY in FIG.

FIG. 4 is a sectional view of an apparatus for brazing blades of a pump impeller mechanism by high-frequency induction heating.

FIG. 5 is a perspective view showing a connection state of a lower heating coil, an upper heating coil, and an adjustment coil used in the brazing apparatus of the present embodiment.

FIG. 6 is a sectional view showing a state in which the blade is brazed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Torque converter 2 Pump impeller mechanism part 3 Opening opening 4 Central opening 5 Casing 5a Outer lower surface part 5b Inner lower surface part 6 Blade 7 Connecting ring 14 Brazing device 15 Work receiving jig 16 Airtight container 17 Lower heating coil 18 Upper heating coil Reference Signs List 20 Adjustment coil for inductance adjustment 21 Parallel circuit 22 High frequency power supply 24 Intermediate tap 25 Series circuit A, B Brazing part (joint part)

Claims (4)

[Claims] 1. A bowl-shaped casing constituting a pump impeller mechanism of a torque converter for an automatic transmission is provided as a brazing member in an airtight container maintained in an inert gas atmosphere, a reducing gas atmosphere, or a vacuum. Storing arrangement,
By heating and melting the brazing material by high-frequency induction heating, a joint portion between the casing and a plurality of blades incorporated in the casing, and a connection for connecting the plurality of blades and upper portions of the blades to each other In a method in which brazing is performed by pouring into a joint portion between a ring and a ring, a spiral-shaped lower heating coil is opposed to an outer lower surface portion of the casing corresponding to the plurality of blades, and the blade and the connection ring are connected to each other. At the upper position, a spiral upper heating coil is opposed to a position corresponding to the inner lower surface portion of the casing, and the lower heating coil and the upper heating coil are connected in parallel with each other. And melting and heating the brazing material by supplying a high-frequency current from one high-frequency power supply to the upper heating coil. Saishi, high frequency induction heating method of brazing material, characterized in that each of the heating rate by these two coils is adjusted to be the same by the output distribution to the lower heating coil and the top heating coils. 2. The power distribution to the lower heating coil and the upper heating coil is performed by connecting a current branch point of a parallel circuit formed by connecting these coils in parallel and one end of one of these coils. 2. The high-frequency induction heating method for a brazing material according to claim 1, wherein the method is performed by connecting an adjustment coil during the heating. 3. The heating temperature distribution of each part of the pump impeller mechanism is adjusted by setting a ratio of an output distribution to the lower heating coil and the lower heating coil according to an inductance value of the adjustment coil. The high-frequency induction heating method for a brazing material according to claim 1 or 2, wherein: (A) a work receiving jig for mounting and holding a bowl-shaped casing constituting a pump impeller mechanism of a torque converter for an automatic transmission; and (B) an inert gas atmosphere or reducing property inside the work receiving jig. An airtight container which is held in a gas atmosphere or vacuum and accommodated in the pump impeller mechanism in a state where the bowl-shaped casing of the pump impeller mechanism is positioned and mounted on the work receiving jig, (C)
A spiral lower heating coil disposed opposite to an outer lower surface portion of the casing corresponding to a plurality of blades assembled inside the casing, and a connecting ring connecting the plurality of blades and upper portions of these blades to each other A high-frequency induction heating mechanism section in which a spiral upper heating coil disposed opposite to the inner lower surface portion of the casing at a position above the upper heating coil is connected in parallel with each other; (D) connected in series to the upper heating coil Adjustment coil for inductance adjustment,
(E) a high-frequency power supply that supplies a high-frequency current to a parallel circuit formed by connecting the lower heating coil and a series circuit of the upper heating coil and the adjustment coil in parallel with each other; By supplying a high-frequency current to the circuit, a high-frequency induction heating of the brazing material is performed by simultaneously performing high-frequency induction heating of a plurality of blades in the casing columns from both upper and lower directions, thereby heating and melting the brazing material. Heating equipment.