JPH09327766A - Brazing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the power consumption from being increased, and to prevent the thrust to be applied to a brazing filler metal from being reduced in a brazing device of electro-magnetic induction pump type. SOLUTION: Electro-magnetic induction pumps 46, 47 are provided along the work carry-in side and the work carry-out side of a tank body 33 to store a brazing filler metal 32. In the electro-magnetic induction pumps 46, 47, a primary core 52 in which an induction coil 51 is wound is arranged outside the tank body 33, and a secondary core 54 is arranged inside the tank 33 through a clearance for elevation of the brazing filler metal. In the primary core 52, a plurality of split cores 52E are arranged in close contact manner on the outer surface of the tank body 33. A primary core pressing mechanism 81 to press the primary core 52 to the outer surface of the tank body 33 by a spring member 85 is provided on the primary core 52. A secondary core pressing mechanism 86 to press the secondary core 54 in the direction in which the clearance 53 for elevation of the brazing filler metal is minimized is provided on the secondary core 54.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brazing device using an electromagnetic induction pump.

[0002]

2. Description of the Related Art FIG. 7 shows an overall structure of a conventional jet type soldering device, which conveys a work such as a component mounting board to be soldered from a work carrying-in port 12 to a work carrying-out port 13 of a device cover 11. Work conveyor for 14
Is provided.

Along this conveyor 14, a fluxer 15 for applying a foamed flux to a work, a preheater 16 for preheating the work, and a solder bath 17 for soldering the work with molten solder jetted from a jet nozzle. When,
A fan 18 for cooling the soldered work is sequentially arranged.

In the solder bath 17, a primary jet nozzle 21a and a secondary jet nozzle 21b are provided. A jet plate 22 having a large number of jet holes is provided at the upper end opening of the primary jet nozzle 21a. The primary jet nozzle 21a supplies molten solder to every corner such as an electrode part of a chip component by a large number of small primary jet waves W1 which are irregularly jetted from the jet holes of the jet plate 22 and the secondary jet nozzle 21b. Shape the soldered part with a quiet secondary jet wave W2.

As shown in FIG. 8, in the solder bath 17, a pressure feed duct 23 is fitted into the lower opening of the nozzle body 21 of the jet nozzles 21a and 21b, and a pump impeller 24 is provided at the end of the pressure feed duct 23. . Suction port for this pump impeller 24
25 and a motor drive mechanism 26 are provided.

The molten solder sucked from the suction port 25 by the rotation of the pump impeller 24 is pressure-fed to the nozzle body 21 through the pressure-feed duct 23 and becomes a jet wave jetted from the nozzle body 21 to be conveyed by the conveyor 14. Soldering is performed on the lower surface of the work P such as a component mounting board that is sandwiched and conveyed by the claw 27. Most of the jet wave remains as it is in the solder bath
It returns to the molten solder surface 28 in 17 and circulates to the suction port 25 of the pump impeller 24.

On the other hand, Japanese Patent Publication No. 51-42590, Japanese Patent Publication No. 2-31628, Japanese Patent Publication No. 3-60581, and Japanese Utility Model Publication No. 63-17572 disclose a brazing device using an electromagnetic pump. ing. This electromagnetic pump is classified into a DC type and an AC type.

A direct current type electromagnetic pump applies a magnetic field perpendicular to the moving passage of a conductive brazing material such as tin, and supplies a direct current to both the moving passage and the magnetic field in the vertical direction, whereby The thrust is generated in the conductive brazing material.

The AC type electromagnetic pump has a structure in which induction coils and iron cores are arranged in a plane along a moving path of a conductive brazing material, and AC currents having a phase shift are supplied to these induction coils to thereby make the conductive coils conductive. A moving magnetic field is generated in the moving path of the brazing material, an electromotive force is generated in the conductive brazing material in the moving path by electromagnetic induction, and a current due to the electromotive force of the brazing material flows in the magnetic flux of the moving magnetic field. It is an electromagnetic induction pump designed to generate thrust in brazing material.

[0010]

A conventional jet-type soldering device of the type in which molten solder is pressure-fed and jetted from a pump impeller rotated by a motor drive mechanism is structurally limited in downsizing of a solder bath. However, it is difficult to keep the amount of solder below the current level.

That is, as shown in FIG. 8, it is necessary to secure a sufficient width dimension from the motor drive mechanism 26 to the nozzle body 21 in the work width direction orthogonal to the traveling direction of the work P. It is necessary to deepen the solder bath 17 so that an object is not caught in the rotating part of the impeller 24, which increases the capacity of the solder bath 17 as a whole.

Further, as shown in FIG. 8, the molten solder sucked from the lower suction port 25 of the pump impeller 24 is discharged upward while being transferred in the work width direction by the pressure feeding duct 23, so that the wave height is increased in the work width direction. Is likely to be non-uniform.

On the other hand, the brazing apparatus of the type in which the brazing material is pressure-fed and jetted by the conventional electromagnetic induction pump can reduce the brazing material amount as compared with the above-mentioned jet type soldering apparatus. There are also problems peculiar to electromagnetic induction pumps.

That is, the electromagnetic induction pump requires a long iron core and an induction coil in the brazing material moving direction in order to create a moving magnetic field, and the long iron core is the outer surface of the tank body containing the brazing material. It is composed of an iron core closely attached to the iron core and an iron core positioned inside the tank through the movement path of the brazing filler metal, and it is preferable to make the inner and outer iron cores as close as possible in order to reduce magnetic flux leakage. When the long iron core is deformed by the heat of the high temperature brazing material, the iron core may be separated from the outer surface of the tank body or the cross-sectional area of the brazing material moving passage may be increased.

As described above, when the iron core is separated from the outer surface of the tank body, the power consumption increases, and when the cross-sectional area of the moving path of the brazing material increases, the thrust acting on the brazing material decreases. is there.

The present invention has been made in view of the above circumstances, and in an electromagnetic induction pump type brazing device, it is possible to prevent an increase in power consumption and a decrease in thrust acting on a brazing material. It is intended.

[0017]

According to a first aspect of the present invention, there is provided a brazing device for brazing a work carried in by jetting a brazing material upward by an electromagnetic induction pump and carried in the jet wave. An electromagnetic induction pump is provided along the tank body containing the brazing filler metal. The electromagnetic induction pump has a primary iron core wound with an induction coil on the outside of the tank body and a brazing filler metal feeding gap inside the tank body. A secondary iron core is arranged through the primary iron core, and the primary iron core is a brazing device in which a plurality of divided iron cores are arranged in close contact with the outer surface of the tank body.

Then, by dividing the primary core,
The amount of thermal deformation of each primary iron core is made minute to prevent the primary iron core from separating from the outer surface of the tank body due to thermal deformation. This prevents an increase in current and power consumption when the primary core separates from the tank body.

According to a second aspect of the present invention, in the brazing apparatus according to the first aspect, the primary iron core is provided with a primary iron core pressing mechanism for pressing the primary iron core against the outer surface of the tank body. .

The primary core pressing mechanism maintains the close contact state of the primary core with the outer surface of the tank body.

According to the invention described in claim 3, the primary iron core pressing mechanism in the brazing device according to claim 2 includes a spring member for pressing the primary iron core to the outer surface of the tank body.

Then, the deformation of the primary core is absorbed by the spring member, and the primary core is always pressed against and brought into close contact with the outer surface of the tank body.

According to a fourth aspect of the present invention, in the brazing apparatus according to the first aspect, the secondary iron core is pressed against the secondary iron core in a direction that minimizes the brazing material feed gap. It has a mechanism.

Then, the secondary iron core pressing mechanism presses the secondary iron core in the direction in which the brazing material pressure feeding gap is minimized, so that the lowering of the brazing material lifting thrust due to the expansion of the brazing material pressure feeding gap is prevented.

According to a fifth aspect of the invention, the secondary iron core pressing mechanism in the brazing device according to the fourth aspect includes a spring member attached to the secondary iron core that is detachable from the tank body.

When clogging occurs in the brazing material pressure feeding gap, the secondary iron core together with the spring member is removed from the tank body,
Maintenance of the brazing material pressure feed gap, secondary iron core, spring members, etc.

[0027]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to FIGS.

As shown in FIG. 1, one tank body 33 for containing a conductive brazing material 32 such as tin or indium is provided. The tank body 33 forms a pump tank part 37 by a bottom plate part 34, vertical plate parts 35 and 36 located below the work loading side and the work discharge side, and a side plate part (not shown).
The horizontal plate portions 38 and 39 located above the work carry-in side and the work carry-out side, the vertical plate portions 41 and 42, the upper edges 43 and 44, and the side plate portions (not shown) form a jet wave forming tank portion 45. I do.

A first electromagnetic induction pump 46 is provided in the vertical direction along the vertical plate portion 35 on the work carrying-in side of this one tank body 33, and along the vertical plate portion 36 on the work carrying-out side of the tank body 33. Then, the second electromagnetic induction pump 47 is provided in the vertical direction.

The first electromagnetic induction pump 46 and the second electromagnetic induction pump 47 are provided with an induction coil 51 on the outer surface of each of the vertical plate portions 35 and 36 on the work loading side and the work unloading side of the tank body 33.
The wound primary iron core 52 is disposed in close contact with the vertical plate portions 35 and 36, respectively, and is placed inside the vertical plate portions 35 and 36 through a brazing material ascending gap 53 as a brazing material pressure feeding gap. The secondary iron cores 54 are respectively arranged.

The primary iron cores 52 on the work carrying-in side and the work carrying-out side have an E-shaped iron core 52E formed by laminating a large number of thin E-shaped iron plates in the width direction (perpendicular to the paper surface of FIG. 1). A large number of concave grooves 55 opened toward the portions 35 and 36 are arranged in the vertical direction so as to face each other, and the respective concave grooves are arranged.
The induction coil 51 is wound between 55.

That is, the primary iron core 52 is divided into a plurality of E-shaped iron cores 52E which are divided by the division planes at right angles to the vertical plate portions 35 and 36.
Are arranged in the up and down direction in close contact with the outer surfaces of the vertical plate portions 35 and 36 of the tank body 33.

Each E-shaped iron core 52E has a primary core pressing mechanism 81 in order to prevent a decrease in the efficiency of electromagnetic induction on the primary core side.
As a result, it is pressed and closely attached to the outer surface of the tank body 33.

In this primary iron core pressing mechanism 81, mounting plates 82 are integrally provided on the upper and lower parts of the tank 33, and screws are mounted between these mounting plates 82.
A spring receiving plate 84 is integrally provided by 83, and a spring member 85 such as a compression coil spring is provided between the spring receiving plate 84 and each E-shaped iron core 52E.

The secondary iron core 54 is an I-shaped iron core formed by laminating a large number of thin I-shaped iron plates in the width direction (perpendicular to the paper surface of FIG. 1), and a slope formed with a suction port 56 at the lower end thereof. Part 57
And the nozzle mounts 58 and 59 are integrally provided on the upper end,
A discharge port that opens upward at the base of the mounting base 59
Forming 61.

Furthermore, by interposing a spacer 62 (FIG. 2) between the secondary iron core 54 formed in a flat plate shape and each vertical plate portion 35, 36, a brazing material as shown in FIG. 1 is obtained. The rising gap 53 is formed.

Further, as shown in FIG. 1 or 2,
In order to prevent a reduction in the efficiency of electromagnetic induction on the secondary core side, the secondary core 54 is pressed against the spacer 62 by the secondary core pressing mechanism 86 over the entire length and is brought into close contact therewith.

The secondary iron core pressing mechanism 86 includes vertical plate portions 35, 36.
The spacer 62, the mounting plate 87, and the spring receiving plate 88 are sequentially welded and integrally attached to each other, and the secondary iron core 54 and the secondary iron core 54 are integrally attached between the spacer 62 and the spring receiving plate 88. Spring members such as compression coil springs and leaf springs 89
Is inserted from above.

As described above, the spacer 62 and the spring receiving plate 88 are welded to the vertical plate portions 35 and 36 of the tank body 33, but the secondary iron core 54, together with the spring member 89, includes the spacer 62 and the spring receiving plate 88. The nozzle mounting base portion 59 of the secondary iron core 54 is engaged with the horizontal plate portion 38 of the tank body 33 so as to be detachably mounted inside the tank body 33.

That is, the secondary core 54 has a mounting structure that can be pulled out upward when necessary for maintenance or the like.

In FIG. 1, the pump tank portion of one tank body 33
A plurality of heaters 65 for melting the brazing filler metal 32, which are located in the middle of the first electromagnetic induction pump 46 and the second electromagnetic induction pump 47, are arranged at the center of 37 in the vertical direction. The heater 65 is a sheathed heater that is long in the width direction (direction perpendicular to the plane of FIG. 1).

The first electromagnetic induction pump 46 and the second electromagnetic induction pump 46
A first nozzle 66 and a second nozzle 67 for jetting the brazing material 32 are provided above the electromagnetic induction pump 47.

That is, the first nozzle 66 is attached to the nozzle mounting bases 58 and 59 integrally provided at the upper end of the secondary iron core 54 on the work loading side, and the upper end of the secondary iron core 54 on the unloading side is mounted. The second nozzle 67 is attached to the nozzle mounts 58 and 59 provided integrally with the.

The first nozzle 66 is provided with a jet plate 72 having a large number of jet holes formed in the opening 71 at the upper end thereof, and by this jet plate 72, a large number of primary jets which eject in a protruding shape and move irregularly. Form a jet wave W1.

The second nozzle 67 includes a direction-directed plate 73 bent in a direction opposite to the work P conveyance direction, and this direction-directed plate 73.
The direction fins 74 projecting from the tip of the 73 in the direction opposite to the direction of conveyance of the work P and the guide plate 75 having an inverted U-shaped cross section mounted on the opposite side face the direction of conveyance of the work P. Forms a smooth secondary jet wave W2.

Next, the first electromagnetic induction pump 46 provided in the vertical direction along the vertical plate portion 35 on the workpiece loading side of the tank body 33.
3 is composed of two sets of left and right electromagnetic induction pumps 46a and 46b arranged in the work width direction orthogonal to the traveling direction of the work P, and the vertical direction of the tank body 33 on the work carry-out side. As shown in FIG. 3, the second electromagnetic induction pump 47 provided in the up-down direction along the plate portion 36 is composed of two sets of left and right electromagnetic induction pumps 47a, 47b arranged in the work width direction.

As shown in FIG. 2, the first electromagnetic induction pump 46 and the second electromagnetic induction pump 47 have a primary iron core 52a and a secondary iron core 54a on one side, and a primary iron core 54a on the other side.
Although the secondary core 52b and the secondary core 54b are separately formed, a common induction coil 51 is used from the primary core 52a on one side to the primary core 52b on the other side.

By this common induction coil 51, the electromagnetic induction pump 46a on one side on the work loading side and the electromagnetic induction pump 46b on the other side on the work loading side, and the one side electromagnetic induction pump 47a on the work unloading side and the other side. Interlock with the electromagnetic induction pump 47b.

Further, as shown in FIG. 2 or FIG. 4, the brazing material rising gap 53 has two left and right sides arranged in the work width direction.
It consists of a pair of brazing material rising gaps 53a and 53b,
As shown in FIG. 3 or 4, 61 is composed of two sets of left and right discharge ports 61a, 61b arranged in the work width direction.

Since the opening edges of the discharge ports 61a and 61b are formed so as to expand upward along all four sides, the molten brazing material has a brazing material rising gap 53a having a small cross-sectional area.
When transitioning from 53b to a nozzle 66 or 67 having a large cross-sectional area, it can be smoothly and evenly expanded in four directions.

On the other hand, as shown in FIG. 3 or 4,
One first nozzle 66 on the work loading side is provided so as to surround the two sets of left and right discharge ports 61a, 61b on the work loading side. Similarly, one second nozzle 67 is provided so as to surround two sets of left and right ejection ports 61a and 61b on the work unloading side.

The depth of these nozzles 66 or 67 has the function of equalizing the pressure of the molten brazing material,
The wave height of the jet wave jetted from the nozzle 66 or 67 can be made uniform over the entire width of the work.

In this way, by the two sets of left and right electromagnetic induction pumps 46a, 46b or electromagnetic induction pumps 47a, 47b arranged in the work width direction, jet waves with sufficient wave width and uniform wave height are secured in the work width direction. To do.

Next, the operation of the embodiment shown in FIGS. 1 to 4 will be described.

First and second electromagnetic induction pumps 46, 47
Supplies a moving magnetic field in the brazing filler metal rising gap 53 by supplying an alternating current such as a three-phase alternating current to the induction coils 51 arranged vertically along the brazing filler metal rising gap 53. An electromotive force due to electromagnetic induction is generated in the conductive brazing filler metal 32 in the material rising gap 53, and a current due to the electromotive force of the brazing filler metal 32 flows in the magnetic flux of the moving magnetic field, so that an upward thrust is applied to the brazing filler metal 32. The brazing filler metal is caused to act and the brazing filler metal is moved upward.

As a result, the brazing filler metal 32 melted by the common heater 65 is sucked from the respective suction ports 56 by the respective electromagnetic induction pumps 46, 47, and the vertical plate portions of the tank body 33 on the work carry-in side and the carry-out side. The brazing filler metal raising gap 53 is raised along 35 and 36 and discharged from the respective discharge ports 61, and the first nozzle
A jet wave is formed as a primary jet wave W1 and a secondary jet wave W2 from the 66 and the second nozzle 67, and the board surface-mounted components of the work P carried in and carried out by each jet wave are brazed to the board surface, and then a jet wave is formed It falls into the tank portion 45 and circulates in the pump tank portion 37.

Since the brazing material rising gap 53 is linearly formed upward and is not bent, two sets of electromagnetic induction pumps 46a are provided on the left and right portions in the work width direction orthogonal to the traveling direction of the work P. , 46b or 47a, 47b, and the brazing material rising gaps 53a, 53b are provided side by side, and the left and right discharge ports 61a, 61b are surrounded by a common nozzle 66 or 67, so that there is sufficient expansion in the work width direction. Further, the primary jet wave W1 or the secondary jet wave W having a uniform wave height distribution over the entire width of the nozzle.
2 is obtained. For this reason, it is possible to easily deal with the work P having a large width dimension, which cannot be dealt with by only one ejection port 61a.

Projective irregularly moving primary jet wave W1
Reliably penetrates into the minute component gaps of the high-density mounting board to ensure good wettability at all brazing parts, and the smooth secondary jet wave W2 formed in an arc shape is The excessive brazing is shaped to prevent brazing defects such as so-called bridges and icicles.

The first nozzle 66 and the second nozzle 67 are
Remove from the tank 33 together with the secondary iron core 54, and nozzles 66, 67
Maintenance of itself and cleaning of the brazing filler metal rising gap 53 of the electromagnetic induction pumps 46 and 47 can be performed.

That is, by pulling up the secondary core 54 together with the first nozzle 66 or the second nozzle 67,
Since the brazing filler metal rising gap 53 from the suction port 56 of the secondary iron core 54 to the discharge port 61 can be disassembled, especially the oxide or the like clogged in the suction port 56 can be easily removed, and the maintenance can be facilitated.

Since the suction port 56 located in the vicinity of the bottom plate portion 34 has a sufficient depth from the surface of the brazing filler metal 32 in which oxide or the like floats, it is difficult for the oxide or the like to be caught in the suction port 56. Although it has an advantage, even if the suction port 56 is clogged with oxide or the like, the oxide or the like can be easily removed by the above decomposition.

Furthermore, by reversing the phase of the three-phase alternating current supplied to the induction coil 51, the brazing material rising gap 53
Since the brazing material 32 inside can be driven reversely downward,
Oxide and the like clogged in the lower suction port 56 can be removed very easily by the backwashing action of the brazing filler metal which is back-sprayed.

Next, FIG. 5 shows another embodiment of the brazing apparatus according to the present invention, which is different from the embodiment shown in FIG. 1 in another primary core pressing mechanism 81a and secondary core pressing mechanism 86.
equipped with a. The same parts as those in the embodiment shown in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.

The primary iron core pressing mechanism 81a includes a vertical plate portion of the tank body 33.
Mounting plates 82 are integrally provided on the upper and lower parts of 35 and 36, and a screw screwing plate 84a is integrally provided between these mounting plates 82 by a screw 83, and each E is attached by a tip of a screw 85a screwed into the screw screwing plate 84a.
The rear surfaces of the shaped iron cores 52E are individually pressed so that the tip ends of the legs of the E shaped iron cores 52E are brought into close contact with the vertical plate portions 35 and 36 of the tank body 33.

In the secondary iron core pressing mechanism 86a, the upper end portion of the spring member 89a formed of a leaf spring formed in a V shape on the secondary iron core 54 is screwed, and the secondary iron core 54 and the spring member 89a are attached to the spacer 62 ( 2) and the spring receiving plate 88. The V-shaped spring member 89a has a shape that easily slides with respect to the contact partner member when the secondary iron core 54 is pulled out upward or inserted downward during maintenance.

Next, FIG. 6 shows one side electromagnetic induction pump 46a and the other side electromagnetic induction pump 46b located on the work loading side, or one side electromagnetic induction pump 47a and the other side positioned on the work unloading side. The electromagnetic induction pump 47b on the side is formed by individual primary cores 52a and 52b, secondary cores 54a and 54b, and induction coils 51a and 51b, respectively. The same parts as those in the embodiment shown in FIG. 2 are designated by the same reference numerals and the description thereof will be omitted.

When the width of the work is small and the conveyor rail 14b fixed in FIG. 4 and movable in the width direction is moved closer to the fixed conveyor rail 14a, the induction coil 51b on one side is moved. It is advisable to stop the energization to and to suspend the electromagnetic induction pumps 46b, 47b on one side.

Although the brazing material rising gap 53 is formed vertically in each of the illustrated embodiments, the case where the brazing material rising gap 53 is set horizontally is also included in the present invention.

[0069]

According to the invention described in claim 1, since a plurality of divided iron cores are arranged in close contact with the outer surface of the tank body as the primary iron core, the thermal deformation amount of each primary iron core is small. As a matter of course, it is possible to prevent the primary core from separating from the outer surface of the tank body due to thermal deformation or the like. As a result, it is possible to prevent the efficiency of electromagnetic induction from decreasing when the primary core separates from the tank body, and to prevent an increase in current and an increase in power consumption.

According to the second aspect of the present invention, the primary iron core pressing mechanism presses the primary iron core against the tank body, and the close contact state of the primary iron core with the outer surface of the tank body can be reliably maintained.

According to the third aspect of the invention, since the primary iron core pressing mechanism includes the spring member for pressing the primary iron core to the tank body, the spring member always applies an appropriate force to the outer surface of the tank body. It can be pressed and brought into close contact with.

According to the fourth aspect of the present invention, the secondary core pressing mechanism presses the secondary core in a direction that minimizes the brazing material pressure feeding gap, whereby the brazing material pressure feeding gap due to thermal deformation of the secondary iron core or the like. It is possible to prevent the expansion of the brazing filler metal, and to prevent the brazing material moving thrust from decreasing due to the reduction in the efficiency of electromagnetic induction due to the expansion.

According to the fifth aspect of the present invention, since the secondary iron core pressing mechanism includes the spring member attached to the secondary iron core which is detachable from the tank body, clogging occurs in the brazing material pressure feeding gap. At this time, the secondary iron core together with the spring member can be removed from the tank body, and the brazing material pressure-feeding gap, the secondary iron core and the spring member can be easily cleaned and maintained.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a brazing device according to the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a plan view in which only the nozzle portion of the brazing device in FIG. 1 is shown in section.

FIG. 4 is a sectional view taken along line IV-IV of FIG. 3;

FIG. 5 is a sectional view showing another embodiment of the brazing apparatus according to the present invention.

FIG. 6 is a sectional view showing another embodiment of the electromagnetic induction pump according to the present invention.

FIG. 7 is a schematic view showing a conventional jet soldering device.

FIG. 8 is a sectional view of a solder bath in the same soldering device.

[Explanation of symbols]

 32 brazing material 33 tank body 46, 47 electromagnetic induction pump 51 induction coil 52 primary iron core 52E multiple iron cores 53 divided brazing material lifting gap as a brazing material feeding gap 54 secondary iron core 81 primary iron core pressing mechanism 85 spring member 86 2 Secondary iron core pressing mechanism 89 Spring member W1, W2 Jet wave P work

Claims (5)

[Claims] 1. A brazing apparatus for brazing a work carried in and carried out by a jet wave of a brazing filler metal by jetting the brazing filler metal upward by an electromagnetic induction pump. The electromagnetic induction pump has a primary core with an induction coil wound outside the bath and a secondary core inside the bath with a brazing material feed gap. A brazing device in which a plurality of formed iron cores are arranged in close contact with the outer surface of the tank body. 2. The brazing apparatus according to claim 1, further comprising a primary iron core pressing mechanism for pressing the primary iron core against the outer surface of the tank body with respect to the primary iron core. 3. The brazing apparatus according to claim 2, wherein the primary iron core pressing mechanism includes a spring member that presses the primary iron core against the outer surface of the tank body. 4. The brazing apparatus according to claim 1, further comprising a secondary iron core pressing mechanism which presses the secondary iron core in a direction that minimizes a brazing material feed gap, with respect to the secondary iron core. 5. The brazing apparatus according to claim 4, wherein the secondary iron core pressing mechanism includes a spring member attached to the secondary iron core that is detachable from the tank body.