JP3720935B2 - Jet brazing method and apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a jet-type brazing method and its apparatus used for brazing (including soldering) of board-mounted components and the like.
[0002]
[Prior art]
As shown in FIG. 7, the conventional jet brazing apparatus is provided with a pump 12 in a tank body 11 and a nozzle 13 for jetting a molten brazing material supplied by the pump 12. The work (component mounting board) P transported on the nozzle 13 is brazed by the brazing material jet wave W that jets.
[0003]
The brazing filler metal surface level 14a during the pump operation is lower than the brazing filler metal surface level 14b during the pump stop, but is maintained at a constant height during the pump operation. For this reason, during the pump operation, the brazing height level at which the jet wave W jetting from the nozzle 13 and the workpiece P are brought into contact with each other by the pump pressure is constant.
[0004]
[Problems to be solved by the invention]
In order to adjust the brazing height level, it is necessary to adjust the height of the tank body relative to the workpiece conveyance level or to adjust the rotational speed of the rotary blades of the pump 12. These adjustments must be made to abort the brazing operation also easy at an unsupported also its adjustment.
The present invention has been made in view of such points, it is to shall aims to allow easy control of the braze surface level during operation.
[0005]
[Means for Solving the Problems]
The invention described in claim 1 is a jet type in which a brazing material in a molten state in a tank is supplied to a nozzle by a jet pump, and jetted from the nozzle to braze a work carried on the nozzle. supplying the brazing method, the suction write bath section with no nozzles are partitioned by a partition plate into a bath body side to the jet tank of a side of the nozzle, the brazing material by drop formation pump provided in the suction tank portion by a jet-type brazing method of controlling the brazing material level in the jet tank unit.
[0006]
Then, the brazing filler metal is supplied to the jet tank part on the nozzle side from the suction tank part on the nozzle-less side partitioned by the partition plate in the tank body, so that the brazing filler metal surface level in the jet tank part was elevated to thereby, Ru increases the braze height level and the brazing material jet flow and the work of the jet from the nozzle is in contact.
[0007]
According to a second aspect of the present invention, there is provided a jet-type brazing apparatus for jetting a molten brazing material in a tank body from a nozzle and brazing a workpiece conveyed on the nozzle. A vertical plate-shaped partition plate, a jet tank portion on the side with the nozzle formed by the partition plate, a suction tank portion on the side without the nozzle, and a jet tank portion provided on the partition plate and the suction The communication part communicating with the tank part, the jet pump for supplying the brazing material in the jet tank part to the nozzle, and the brazing material surface level in the jet tank part by supplying the brazing material in the suction tank part into the jet tank part A jet brazing device including a drop forming pump to be controlled .
[0008]
When increasing the braze flow rate supplied from the suction tank portion to the jet tank portion by drop formation pump, it becomes many brazing material flow flowing to the suction tank portion via the communicating portion from the jet tank unit accordingly, the jet The difference between the brazing filler metal surface level in the tank and the brazing filler metal surface level in the suction tank increases, and the brazing filler metal surface level in the jet tank increases and the brazing filler metal surface level in the suction tank decreases. When the brazing filler metal surface level in the jet tank rises, the brazing filler wave jetted from the nozzle by the jet pump also rises, and the brazing height level in contact with the workpiece also rises.
[0009]
請 Motomeko invention described in 3, in which the nozzle-type brazing apparatus according to claim 2 Symbol mounting, the at least one jet pump and drop formation pump was electromagnetic induction pump.
[0010]
And the brazing filler metal surface level in a jet tank part and the brazing height level of a brazing filler metal jet wave are maintained with high precision by an electromagnetic induction pump.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the first embodiment shown in FIGS. 1 and 2, the second embodiment shown in FIG. 3, the third embodiment shown in FIG. 4, and the fourth embodiment shown in FIG. The embodiment will be described with reference to the fifth embodiment shown in FIG. Note that brazing means a superordinate concept including soldering.
[0012]
As shown in FIG. 1, a vertical plate-shaped partition plate 22 that divides the brazing material surface in a planar manner is provided at one corner of one tank body 21 that contains a conductive brazing material such as tin and indium. The partition plate 22 divides and forms the large area jet tank section 23 and the small area suction tank section 24. As shown in FIG. 2, the partition plate 22 is provided with a communication hole 25 as a communication portion for communicating the jet tank section 23 and the suction tank section 24. The communicating part may be a notch.
[0013]
As shown in FIG. 1 or FIG. 2, the jet tank section 23 includes a first electromagnetic induction pump 31 and a first electromagnetic induction pump 31 as jet pumps that supply the brazing material 26 in the jet tank section 23 to the nozzles 27 and 28. The electromagnetic induction pump 32 is provided, and the suction tank section 24 is provided with a third electromagnetic induction pump 33 as a drop forming pump for supplying the brazing material in the suction tank section 24 into the jet tank section 23.
[0014]
These electromagnetic induction pumps 31, 32 and 33 are flat linear induction pumps (FLIP) which are a kind of squirrel-cage induction pumps.
[0015]
The first electromagnetic induction pump 31 for jet is provided in the vertical direction along the vertical plate portion 35 erected on the work carry-in side of the bottom plate portion 34 in the tank body 21, and the second electromagnetic induction pump 32 is provided in the tank body. 21 in the vertical direction along the vertical plate portion 36 on the work carry-out side. These electromagnetic induction pumps 31 and 32 suck in molten solder from below and move it upward.
[0016]
On the other hand, the third electromagnetic induction pump 33 for forming the drop is provided in the vertical direction along the vertical plate portion 35 on the work loading side in the tank body 21, similarly to the first electromagnetic induction pump 31. The electromagnetic induction pump 33 sucks molten solder from the upper side and moves it downward by energization in the opposite direction to the first and second electromagnetic induction pumps 31 and 32.
[0017]
As shown in FIG. 2, the tank body 21 is composed of a bottom plate portion 34, vertical plate portions 35 and 36 positioned below the workpiece carry-in side and the work carry-out side, and a side plate portion (not shown), Forming a lower tank portion 37 as a lower portion of the horizontal plate portions 38 and 39, vertical plate portions 41 and 42, upper edge portions 43 and 44, which are positioned on the work carry-in side and work carry-out side, The upper tank part of the jet tank part 23 is formed by the side plate part not formed.
[0018]
Since the first electromagnetic induction pump 31 and the second electromagnetic induction pump 32 have exactly the same structure, FIG. 2 shows the second electromagnetic induction pump 32 and the third electromagnetic induction pump 33 in cross section. The first electromagnetic induction pump 31 is positioned so as to overlap the other side of the third electromagnetic induction pump 33.
[0019]
The first electromagnetic induction pump 31 and the second electromagnetic induction pump 32 are the primary wound around the induction coil 51 on the outer side surfaces of the vertical plate portions 35 and 36 on the work carry-in side and the work carry-out side of the tank body 21. The iron core 52 is arranged in close contact with the vertical plate portions 35 and 36, respectively, and the secondary iron core 54 is arranged inside the vertical plate portions 35 and 36 via the brazing material moving gap 53, respectively.
[0020]
The primary iron core 52 on the work loading side and work unloading side has an E-shaped iron core 52E formed by laminating a number of thin E-shaped iron plates in the width direction (perpendicular to the plane of FIG. 2). An induction coil 51 is wound between the concave grooves 55 in the vertical direction along 36.
[0021]
Each E-shaped core 52E is pressed against and closely adhered to the outer surface of the tank body 21 by the primary core pressing mechanism 81 in order to prevent a reduction in the efficiency of electromagnetic induction on the primary core side.
[0022]
This primary iron core pressing mechanism 81 is provided with a mounting plate 82 integrally on the upper and lower portions of the vertical plate portions 35, 36 of the tank body 21, and a screw screw plate 84 is integrally provided with screws 83 between the mounting plates 82. The back of each E-shaped iron core 52E is individually pressed through the pressing plate 80 by the tip of the screw 85 screwed into the screw threaded plate 84, and the leg tip of each E-shaped iron core 52E is connected to the vertical plate portion of the tank body 21. It is made to adhere to 35 and 36.
[0023]
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 in FIG. 2), and has a slope 57 that forms a suction port 56 at the lower end thereof. A slope portion 60 is provided at the upper end portion and fitted into the core insertion hole 59 of the nozzle mounting base plate 58, and the discharge opening 61 opened upward is formed by the core insertion hole 59 and the slope portion 60. Is formed. The nozzle mounting base plate 58 is attached to the horizontal plate portions 38 and 39 of the tank body 21.
[0024]
Further, by interposing a spacer (not shown) between the secondary iron core 54 formed in a flat plate shape and the vertical plate portions 35 and 36, the brazing filler metal moving gap 53 as shown in FIG. Form. Further, in order to prevent the efficiency of electromagnetic induction on the secondary iron core side from decreasing, the secondary iron core pressing mechanism 86 causes the secondary iron core 54 to be pressed and brought into close contact with the spacer (not shown).
[0025]
The secondary core pressing mechanism 86 fixes a spring receiving plate 88 in parallel with the vertical plate portions 35 and 36, and a wedge plate portion 88a is integrally attached to the spring receiving plate 88. A spring member (plate spring) 89 integrally attached to the secondary iron core 54 is detachably inserted from above through the iron core insertion hole 59 of the nozzle mounting base plate 58, and the spring member 89 lowered with the secondary iron core 54 is attached. Engage with the wedge plate portion 88a.
[0026]
When the secondary iron core 54 is shifted upward, the spring member 89 integral with the secondary iron core 54 is disengaged from the wedge plate portion 88a of the spring receiving plate 88, and the spring member 89 removes the secondary iron core 54 from the spacer (not shown). Therefore, the secondary iron core 54 and the spring member 89 can be easily pulled upward. Thereby, the oxide etc. which were clogged in the suction inlet 56 etc. can be removed easily, and a maintenance can be performed easily.
[0027]
In FIG. 2, a plurality of heaters 65 for melting the brazing filler metal 26 are arranged in the vertical direction at the center of the lower tank part 37 of the jet tank part 23. This heater 65 is a sheathed heater that is long in the width direction (perpendicular to the paper surface of FIG. 2).
[0028]
Further, in order to form a turbulent jet wave (hereinafter referred to as a primary jet wave W1) by irregularly jetting the brazing filler metal 26 on the upper part of the first electromagnetic induction pump 31 and the second electromagnetic induction pump 32. A primary nozzle 27, and a secondary nozzle 28 for forming a smooth rectified finishing jet wave (hereinafter referred to as a secondary jet wave W2) disposed downstream of the primary nozzle 27 in the workpiece conveying direction; Are provided respectively.
[0029]
That is, as shown in FIG. 2, the primary nozzle 27 is attached to the work loading side nozzle mounting base plate 58, and the secondary nozzle 28 is attached to the work carrying side nozzle mounting base plate 58.
[0030]
The primary nozzle 27 is provided with a jet plate 72 having a large number of jet holes drilled in an opening 71 at the upper end, and by this jet plate 72, a large number of primary jet waves W1 moving irregularly by jetting in a protruding shape are formed. To do.
[0031]
The secondary nozzle 28 includes a convex portion 73 swelled in the moving direction of the workpiece P, an upper plate portion 74 protruding from the convex portion 73 in a direction opposite to the moving direction of the workpiece P, and the upper plate portion. A brazing material ejection hole 75 formed in a horizontally long slit shape below 74 and a lower plate portion 76 provided below the brazing material ejection hole 75, in a direction opposite to the traveling direction of the workpiece P A smooth secondary jet wave W2 for shaping finish that jets in a rectifying manner is formed.
[0032]
Next, two sets of first electromagnetic induction pumps 31 provided in the vertical direction along the vertical plate portion 35 on the work loading side of the tank body 21 are arranged in the width direction of the work P as shown in FIG. Similarly, a second electromagnetic induction pump 32 provided in the vertical direction along the vertical plate portion 36 on the work carry-out side of the tank body 21 is also shown in FIG. And two sets of electromagnetic induction pumps 32a and 32b arranged in the width direction of the workpiece P.
[0033]
Further, the brazing material movement gap 53 is composed of two sets of brazing material movement gaps 53a and 53b arranged in the width direction of the workpiece P as shown in FIG. 1, and the discharge port 61 is as shown in FIG. And two sets of discharge ports 61a and 61b arranged in the width direction of the workpiece P.
[0034]
The first and second electromagnetic induction pumps 31 and 32 are provided with two sets of discharge ports 61a and 61b provided with two sets of electromagnetic induction pumps 31a and 31b or brazing material moving gaps 53a and 53b of 32a and 32b. Is surrounded by a common nozzle 27 or 28, so that a primary jet wave W1 or a secondary jet wave W2 having a uniform wave height distribution over the entire longitudinal width of the nozzles 27 and 28 is obtained. For this reason, it is possible to deal with a workpiece having a large width that cannot be handled by only one discharge port 61a.
[0035]
On the other hand, as shown in FIG. 2, the third electromagnetic induction pump 33 is provided with a suction port 56 at the upper end portion of the brazing filler metal moving gap 53 and a discharge port 61 at the lower end portion. Since these are the same as those of the first and second electromagnetic induction pumps 31 and 32, the same reference numerals are given to corresponding parts, and the description of the structure is omitted.
[0036]
Next, the operation of the illustrated embodiment will be described.
[0037]
The first and second electromagnetic induction pumps 31 and 32 supply alternating currents having a phase shift such as three-phase alternating current to induction coils 51 arranged in the vertical direction along the brazing filler metal moving gap 53 of the conductive brazing filler metal. As a result, a moving magnetic field is generated in the brazing filler metal moving gap 53, and an electromotive force is generated by electromagnetic induction in the conductive brazing filler metal 26 in the brazing filler metal moving gap 53. By flowing in the magnetic flux, an upward thrust is applied to the brazing material 26, and the brazing material is moved up.
[0038]
As a result, the molten brazing material 26 melted by the heater 65 is sucked from the respective suction ports 56 by the first and second electromagnetic induction pumps 31 and 32, and the vertical direction of the tank body 21 on the work carry-in side and the carry-out side. The brazing filler metal moving gap 53 is raised along the plate portions 35, 36, discharged from the respective discharge ports 61, and jetted as the primary jet wave W1 and the secondary jet wave W2 from the primary nozzle 27 and the secondary nozzle 28, After the board surface mounting component of the work P carried in and out of the jet wave is brazed to the board surface, it falls to the jet tank section 23.
[0039]
At this time, the primary jet wave W1 ejected from the primary nozzle 27 and moving irregularly in a protruding manner surely penetrates into the minute component gap of the high-density mounting substrate, and is satisfactorily wetted at all brazed portions. In addition, the smooth secondary jet wave W2 ejected from the secondary nozzle 28 and formed into a circular arc shape shapes the excessive primary brazing portion and brazes so-called bridges, icicles, etc. Correct the defect.
[0040]
On the other hand, the third electromagnetic induction pump 33 operates in the opposite direction to the first and second electromagnetic induction pumps 31 and 32 to apply a downward thrust to the brazing material 26 in the brazing material moving gap 53, By lowering the brazing material, the brazing material is sucked into the tank body 21 from the suction tank section 24 partitioned by the partition plate 22, and the brazing material is fed under pressure into the lower tank section 37 of the jet flow tank section 23. As a result, the level of the brazing filler metal surface 26a of the jet tank 23 is raised, the level of the brazing filler metal surface 26b of the suction tank 24 is lowered, and a drop is made between the levels of the brazing filler metal surfaces 26a, 26b of the two tanks. wear.
[0041]
At this time, the pump discharge amount of the third electromagnetic induction pump 33 can be variably adjusted by frequency control or voltage control of the current supplied to the induction coil even during brazing operation. When the flow rate of the brazing filler metal flowing into the lower tank part 37 of the jet tank part 23 from the inside of the part 24 is increased, the brazing material flowing out from the jet tank part 23 to the suction tank part 24 through the communication hole 25 of the partition plate 22 accordingly. In order to increase the flow rate, the difference between the level of the brazing filler metal surface 26a of the jet tank 23 and the level of the brazing filler metal surface 26b of the suction tank 24 increases, and the level of the brazing filler metal surface 26a in the jet tank 23 increases. As it rises, the level of the brazing filler metal surface 26b in the suction tank section 24 falls.
[0042]
Thus, when the level of the brazing filler metal surface 26a in the jet tank section 23 on the nozzle side increases, the surface serving as a reference for the pump head rises, so that the first electromagnetic induction pump 31 jets from the primary nozzle 27. The primary jet wave W1 and the secondary jet wave W2 jetted from the secondary nozzle 28 by the second electromagnetic induction pump 32 also rise, and the brazing height level in contact with the workpiece P can be raised.
[0043]
On the other hand, controlling the pump discharge amount of the third electromagnetic induction pump 33 is not only when the brazing height level at which the jet waves W1 and W2 are in contact with the workpiece P is variably controlled, but also due to consumption of the brazing material. It can also be used when the brazing filler metal surface 26a in the jet tank section 23 is prevented from being lowered and the brazing filler metal surface 26a is kept at a constant level.
[0044]
That is, when the level of the brazing filler metal surface 26a in the jet tank section 23 decreases as the brazing filler metal is consumed, control is performed so that the brazing filler metal surface 26a is raised by that amount and returned to the original level. This control may be automatically performed by a feedback control system while detecting the level of the brazing material surface 26a by a float switch or the like.
[0045]
In such level control, the electromagnetic induction pumps 31 and 32 of the jet tank section 23 adjust the brazing height levels of the brazing material primary jet wave W1 and the brazing material secondary jet wave W2 jetted from the nozzles 27 and 28, respectively. It is possible to control with higher accuracy than when using a rotary blade type impeller pump. Similarly, the electromagnetic induction pump 33 in the suction tank section 24 can control the level of the brazing filler metal surface 26a in the jet tank section 24 with higher accuracy than when a rotary blade type impeller pump is used.
[0046]
Next, FIG. 3 shows an embodiment corresponding to the invention described in claim 3, in which no communication hole is provided in the partition plate 22, and the upper end of the partition plate 22 is at the level of the brazing filler metal surface 26 a in the jet tank section 23. By setting the same as the above, an overflow portion 91 for overflowing the brazing material is provided at the upper end of the partition plate 22. Since other structures are the same as those of the embodiment of FIGS. 1 and 2, the same parts are denoted by the same reference numerals, and the description thereof is omitted.
[0047]
Then, the suction and discharge action of the third electromagnetic induction pump 33 raises the level of the brazing material surface 26a in the jet tank 23 on the side where the nozzle is located, and the brazing in the suction tank 24 on the side where there is no nozzle. When the level of the material surface 26b is lowered, the brazing material flows over the overflow part 91 of the partition plate 22 from the jet tank part 23 into the suction tank part 24 due to the drop generated between the brazing material surfaces 26a and 26b. Along with the flow of the brazing material, unnecessary substances such as oxide floating on the brazing filler metal surface 26a in the jet tank 23 also get over the overflow part 91 of the partition plate 22 and fall into the suction tank 24. Since it is collected on the brazing filler metal surface 26b in the suction tank section 24, it is possible to prevent the unnecessary substances from being caught in the first and second electromagnetic induction pumps 31 and 32 and to remove the unnecessary substances from the suction tank. It can be removed by scraping from the part 24.
[0048]
Next, in the embodiment shown in FIG. 4, both the jet pump and the head forming pump are rotary vane-shaped impeller pumps 92 and 93, and a communication hole 25 corresponding to claim 2 is provided. It is an embodiment. In these impeller pumps 92 and 93, an impeller 97 is disposed in a casing 96 provided with a suction port 94 and a discharge port 95.
[0049]
Next, in the embodiment shown in FIG. 5, both the jet pump and the drop forming pump are impeller pumps 92 and 93 having rotary vanes, and an overflow portion 91 corresponding to claim 3 is provided. It is an embodiment.
[0050]
Next, in the embodiment shown in FIG. 6, the jet pump is a rotary vane type impeller pump 92 and the drop forming pump is an electromagnetic induction pump 33.
[0051]
Each embodiment is an example in which the tank body 21 is divided into two parts by one partition plate 22 and one suction tank part 24 is provided. However, the tank body 21 is divided into three or more parts by a plurality of partition plates. A plurality of suction tank portions 24 may be provided.
[0052]
【The invention's effect】
According to the first aspect of the present invention, the brazing material between the tank parts is supplied by supplying the brazing material from the suction tank part on the side without the nozzle partitioned by the partition plate in the tank body to the jet tank part on the side with the nozzle. Since a drop is added to the material level, the brazing material surface level in the jet tank can be controlled freely during operation according to the degree of the drop, and the brazing height level at which the brazing material jet wave contacts the workpiece can also be freely controlled. it is possible, to prevent the deterioration of the brazing material level in the jet tank section due to the consumption of the brazing material, Ru can keep the brazing material surface level constant.
[0053]
According to the second aspect of the present invention, the brazing filler metal in the suction tank is supplied into the jet tank by the drop forming pump, and is circulated from the jet tank to the suction tank through the communicating part of the partition plate. By controlling the flow rate of the drop forming pump, the level difference of the brazing filler metal surface between the jet tank and the suction tank can be controlled, and the brazing filler metal surface level in the jet tank can be freely controlled even during operation. The brazing height level due to the material jet wave can be freely variably controlled, and the brazing material surface level in the jet tank portion due to the consumption of the brazing material can be prevented and the brazing material surface level can be kept constant.
[0054]
According to the invention 請 Motomeko 3, wherein the electromagnetic induction pump, and the brazing material level in the jet tank portion, it is possible to control the brazing height level of the braze jet flow with high accuracy, miniaturization and fabrication of equipment Simplify.
[Brief description of the drawings]
FIG. 1 is a plan view showing a first embodiment of a jet-type brazing apparatus according to the present invention.
FIG. 2 is a cross-sectional view taken along the line II-II in FIG.
FIG. 3 is a sectional view showing a second embodiment of the brazing device.
FIG. 4 is a sectional view showing a third embodiment of the brazing device.
FIG. 5 is a cross-sectional view showing a fourth embodiment of the brazing device.
FIG. 6 is a cross-sectional view showing a fifth embodiment of the brazing device.
FIG. 7 is a cross-sectional view showing a conventional jet brazing device.
[Explanation of symbols]
21 tank
22 Partition plate
23 Jet tank section
24 Suction tank section
25 Communication hole as communication part
26 Brazing material
26a, 26b Brazing material surface
27, 28 nozzles
31, 32 Electromagnetic induction pump as jet pump
33 Electromagnetic induction pump as a head for forming a head
91 Overflow part P Work W1, W2 Jet wave

Claims (3)

In the jet-type brazing method in which the brazing material melted in the tank body is supplied to the nozzle by a jet pump and jetted from the nozzle, and brazing is performed on the workpiece conveyed on the nozzle.
By supplying the brazing material from the suction tank section on the side without nozzles partitioned by the partition plate in the tank body to the jet tank section on the side with nozzles by means of a drop forming pump provided in the suction tank section , the jet tank nozzle-type brazing method characterized by controlling the brazing material level in the section. In a jet-type brazing device that brazes a brazing material in a molten state from a nozzle in a tank and brazes a workpiece conveyed on the nozzle,
A vertical plate-shaped partition plate that divides the brazing filler metal surface into a plurality of parts,
A jet tank section on the side with nozzles formed by a partition plate and a suction tank section on the side without nozzles ;
A communication part for communicating the jet tank part and the suction tank part provided in the partition plate;
A jet pump for supplying the brazing material in the jet tank to the nozzle;
A jet-type brazing apparatus comprising: a drop forming pump that controls a brazing filler metal surface level in a jet tank section by supplying brazing material in a suction tank section into the jet tank section . Jet pump and the at least one drop formation pump is characterized in that the electromagnetic induction pump according to claim 2 Symbol placement of nozzle-type brazing apparatus.

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