JPH0458473A - Sticking method for brazing filler metal - Google Patents

Abstract

PURPOSE:To suppress the stuck quantity of a brazing filler metal stuck to a connected member to the minimum required and reduce the cost by forming recesses reaching the connection portion of a connection line on the connected member, and filling the molten brazing filler metal only into the recesses. CONSTITUTION:Multiple connecting claw sections 12 extended along the axis at a uniform interval in parallel with each other are formed at the lower end section of a commutator 10. The connecting claw sections 12 are then formed into a hook shape, and the winding of an armature coil is connected to them. A recessed groove 14 is formed in parallel with the axis at the middle section in the width direction on the outer periphery face of each connecting claw section 12. When end edges 12B of the connecting claw sections 12 are brought into contact with a molten brazing filler metal R, the temperature of the connecting claw sections 12 is further increased, flux is activated, the surface lubricating function is increased, when the temperature of the grooves 14 reaches the brazing filler material melting temperature, the brazing filler metal R rises along the grooves 14 via the capillary phenomenon. The brazing filler metal R is filled in the grooves 14.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for attaching a brazing material, and particularly to a method for attaching a brazing material to a member to be connected to which a connecting wire is connected by heat welding. Regarding.

[Prior Art] An example of a device in which a connection wire is connected to a connected member by heat welding is a commutator of an electric motor.

In the commutator, the windings of the armature coil are connected to the connection claws (commutator pieces) by, for example, resistance welding. By the way, if the winding is simply connected (crimped) to the wire connection claw, there is a problem in that the electrical resistance between the wire connection claw and the winding increases due to expansion and contraction of each component when thermal shock is applied. there were. Further, since a minute gap is generated between the wire connection claw and the winding, oxidation is likely to occur, and in this case, there is also the problem of increased electrical resistance.

Therefore, a brazing material is attached in advance to the connection claws of such a commutator, and the heat generated when the windings are connected (crimped) melts the brazing material again, thereby forming the connection claws. It is known that the periphery of the connection between the wire and the winding is coated with a brazing material to prevent an increase in electrical resistance due to thermal expansion, contraction or oxidation.

Here, the method of attaching the brazing material to the component to be connected, such as a commutator, to which the connecting wire is connected by heat welding, is a barrel-type electrolytic plating method, a melt plating method, or a method in which the brazing material is attached in advance. Various methods are known, such as a method for forming a laminate plate into a cylindrical shape. For example, a method of attaching a brazing material to the connection claws of a commutator by barrel electrolytic plating is used for boat fishing because it can ensure a large production capacity.

[Problems that Hakko is trying to solve] However, the barrel electrolytic plating method described above requires large equipment (for example, an electrolytic plating device), and also uses chemicals such as sulfuric acid, so it does not require acid-based Waste liquid treatment facilities were essential. Furthermore, pretreatment such as cleaning with acidic liquid was necessary to ensure plating.

In addition, with the melt plating method, processing can be performed using small equipment and simple wastewater treatment facilities, but there are problems in that the film of adhered brazing material is thick and that a large amount of brazing material is used due to oxidation of the brazing material. .

Above all, the conventional brazing material adhesion method has the disadvantage that the brazing material is deposited in areas other than the connecting portion between the connected member and the connecting wire, that is, in areas where the adhesion of the brazing material is not originally required. As a result, the amount of brazing filler metal deposited increases unnecessarily, resulting in high costs.

In this case, it is conceivable to apply masking to areas that do not require attachment of the brazing filler metal and partially attaching the brazing filler metal, but this would significantly reduce production efficiency and increase costs.

In consideration of the above facts, the present invention can reduce costs by minimizing the amount of brazing filler metal attached to connected members, and can achieve this with small and simple equipment. The purpose is to obtain a method for attaching materials.

[Means for Solving the Problems] A brazing material adhering method according to the present invention is a brazing material adhering method for adhering a brazing material to a member to be connected to which a connecting wire is connected by heat welding, and in which the brazing material is attached to a member to be connected by heat welding. The method is characterized in that a recess is formed in the connection member and communicates with at least the connection portion of the connection wire, and then molten brazing material is allowed to flow into the recess to fill the recess with only the brazing material.

[Operation] In the brazing material adhesion method having the above configuration, a concave portion that communicates with the connecting portion of the connecting wire is formed in advance in the member to be connected. Here, when the molten brazing material is allowed to flow into the recess, the recess is sequentially filled with the brazing material and reaches the connection portion of the connection wire.

When the connecting wires are connected by heat welding, the brazing material is melted again by the heat during the connection, and the periphery of the connection portion is coated with the brazing material. Therefore, subsequent oxidation and increase in electrical resistance are prevented.

In this way, the brazing filler metal is not attached to a portion other than the connection portion between the connected member and the connection line, that is, a portion to which attachment of the brazing filler metal is not originally required. Therefore, the amount of brazing filler metal deposited can be minimized without performing masking or the like, and costs can be reduced.

Further, since only the molten brazing material is used, there is no need for an acid-based waste liquid treatment facility, and the pretreatment for adding the brazing material can be carried out using small and simple equipment.

[Example 1] FIG. 1 shows a perspective view of a commutator 10, which is a member to be connected, to which the brazing material adhesion method according to the first embodiment of the present invention is applied, just before the brazing material is attached. There is.

In this state, the commutator 10 is formed into a substantially cylindrical shape, and a plurality of wire connection claws 12 extending parallel to each other and at regular intervals along the axis are formed at the lower end over the entire circumference. There is. These wire connection claws 12 are later shaped into a hook shape, to which windings (not shown) of the armature coil are connected.

A groove 14 serving as a concave portion is formed parallel to the axis in the widthwise intermediate portion of the outer circumferential surface of each wire connection claw portion 12 . As shown in FIGS. 2 and 3, the groove 14 is formed to have a V-shaped cross section, the upper edge of which reaches slightly above the base end 12A of each wire connection claw portion 12, and the lower edge of the groove 14 that connects the wires. It reaches the edge 12B of the claw portion 12. The groove 14 thus passes through the connection site of the windings of the armature coil.

Next, the manufacturing procedure of the commutator 10 will be explained according to the manufacturing process diagram shown in FIG. 4.

First, in step 50, a metal material is formed into the basic shape of the commutator 10 including each wire connection claw portion 12 by press working or the like, and a groove 14 is formed in each wire connection claw portion 12. Further, the groove 14 can also be formed in a separate process by cutting or the like. This results in a basic state of approximately cylindrical shape as shown in FIGS. 1 and 5(A).

Next, a brazing material adhesion process (step 54) is performed. That is, in step 56, the edge 12B of each wire connection claw portion 12
(and the surrounding area), and further, in step 58, the commutator 10 is preheated. As a result, the temperature of each wire connection claw portion 12 increases, and volatile matter in the flux is removed. Next, in step 60, each wire connection claw portion 12 is brought into contact with the molten brazing material R (as shown in FIG. 5(B)).

Here, as shown in detail in FIG. 6, when the edge 12B of each wire connection claw 12 comes into contact with the molten brazing material R, the temperature of each wire connection claw 12 further increases, and the flux is activated. When the surface lubrication effect increases and the temperature of the groove 14 reaches the melting temperature of the filler metal, the filler metal R moves up the groove 14 due to capillary action.

As a result, the groove 14 is filled with the brazing material R (step 6
2).

After each groove 14 is filled with the brazing material R, each wire connection claw portion 12 is separated from the brazing material R in step 64. Thereafter, the brazing filler metal R solidifies as it cools, and the groove 14 is reliably filled with the brazing filler metal R. With the above steps, the process of attaching the brazing material R is completed.

After the brazing filler metal R is filled into the groove 14, the process proceeds to step 66, where the resin portion 16 is filled and molded (the state shown in FIG. 5(C)), and further, in step 68, the inner and outer peripheries are It is cut (as shown in FIG. 5(D)).

Next, in step 70, each wire connection claw portion 12 is bent and shaped into a predetermined shape (as shown in FIG. 5(E)). After the shaping of each wire connection claw portion 12 is completed, in step 72, the winding of the armature coil is connected (fused) to each wire connection claw portion 12 by resistance welding or the like. Here, when the windings of the armature coil are connected, the brazing material R attached to the groove 14 melts again due to the heat generated during resistance welding, and the area around the connecting part between the wire connecting claw part 12 and the winding wire is melted again. It is in a state where it is coated with the brazing filler metal R, and subsequent increases in electrical resistance due to thermal expansion/contraction and oxidation are prevented.

Further thereafter, in step 74, the outer circumferential surface is shaped, and as shown in FIGS. 7 and 8, undercut portions 17 and riser portions 18 are formed, and the segments 19 are insulated, and the process is completed.

As explained above, since the brazing filler metal R is filled only into the grooves 14 formed in advance in each of the wire connection claws 12,
The brazing filler metal R is not attached to a portion other than the connecting portion between the wire and the winding, that is, a portion to which the brazing filler metal R is not originally required to be attached. Therefore, the amount of the brazing filler metal R deposited can be minimized without performing masking, etc., and production efficiency can be improved and costs can be reduced. In addition, in this case, the cross-sectional area of the intermediate portion of the groove 14 corresponding to the edge 12B and the intermediate portion of each connection claw portion 12 (that is, the portion other than the portion where the winding of the armature coil is resistance welded) is reduced in cross-sectional area. By forming it into a shape, the brazing material R
The amount of adhesion can be further reduced, making it more effective.

In addition, the edge 12 of the wire connecting claw portion 12 is
Since the brazing filler metal R can be attached simply by contacting the brazing filler metal R in which B is melted, there is no need for an acid-based waste liquid treatment facility, and the brazing filler metal attachment process can be carried out using small and simple equipment. Furthermore, when attaching the brazing filler metal R, only the end 112B of each connection claw portion 12 comes into contact with the melted brazing filler metal R, so the air contact area of the melted brazing filler metal itself can be significantly reduced. □This makes it possible to reduce oxidation of the brazing filler metal itself.

In this embodiment, only one groove 14 as a concave portion is formed in each connection claw portion 12, but other grooves perpendicular to the groove 14 may be formed without paying attention to this. It's okay. For example, FIG. 9(A) or FIG. 9(B)
), a lateral groove 20 or 22 may be formed corresponding to the connection portion with the winding. In addition, the wire connection claw portion 12
The grooves formed in the grooves are not limited to one line, but two grooves 24 and 26 may be formed as shown in FIG. 9(C), or more grooves may be formed. Further, in addition to the grooves 24 and 26 formed in two parts as shown in FIG. 9(D), a lateral groove 28 may be further formed perpendicular to these grooves. Also, Figure 9 (E
), lateral grooves 30 and 32 may be formed at a plurality of locations corresponding to the connection portions with the windings. In these cases,
This further ensures that the area where the winding of the armature coil is resistance welded is covered with the brazing material R.

Furthermore, in this embodiment, the groove 14 is formed only on the outer circumferential surface of each wire connection claw portion 12, but as shown in FIG. A back groove 34 may also be formed. In this case, the end edge 12B of the wire connection claw portion 12 is dipped into the molten brazing material R to form the groove 14.
When filling the inside with the brazing filler metal R, the brazing filler metal R easily enters the groove 14 through the back groove 34, and filling can be performed more reliably.

Further, in this embodiment, the groove 14 has a V-shaped cross section and is formed on the outer circumferential surface of the wire connecting claw part 12, but the groove 14 is not limited to this, and as shown in FIG. The groove 36 may be formed in a rectangular shape. Also the first
As shown in FIG. 1(B), a configuration may be adopted in which a through groove 38 passing through the wire connection claw portion 12 is formed. Even in these cases, it is possible to fill only the groove 36 or the through groove 38 with the brazing filler metal R, and it is possible to reduce the cost by minimizing the amount of the brazing filler metal R deposited.

Next, another embodiment of the present invention will be described. Note that parts that are basically the same as those in the first embodiment are given the same reference numerals as in the first embodiment, and their explanations are omitted.

FIG. 12 is a perspective view showing a schematic structure of a brazing material adhesion method according to a second embodiment of the present invention.

In this case, the commutator IO, which is formed from a metal material into a basic cylindrical shape and has grooves 14 as recesses, is placed between the pair of application rollers 40 and 42. Here, a paste-like brazing filler metal R containing flux is passed through the nozzle 40.
The brazing material R is applied onto the surface of the application rollers 42, 44 by rotating the application rollers 42, 44 in this state to fill the grooves 14 of the commutator 10 (so-called roller printing). Next, after removing the excess brazing material R adhering to the surface of the commutator 10 other than the grooves 14 with a brush or the like, the whole is heated. As a result, the brazing filler metal is melted and filled in the groove 14, and then the brazing filler metal R is solidified as it cools, so that the groove 14 is reliably filled with the brazing filler metal R. With the above steps, the process of attaching the brazing material R is completed.

In this way, also in this embodiment, since the brazing filler metal R is filled only into the pre-formed groove 14, the brazing filler metal R is originally filled with the filler filler metal R.
The brazing filler metal R is not deposited on areas where it is not required. Therefore, the amount of brazing filler metal R deposited can be minimized without performing masking, etc.
Production efficiency can be improved and costs can be reduced.

FIG. 13 shows a schematic structure of a brazing material adhesion method according to a third embodiment of the present invention in a perspective view, and FIG. 14 shows an enlarged view of the main parts.

In this embodiment, soldering is performed using a wire solder 46 and a soldering iron (heat source) 48, etc., into the groove 14 as a recess formed in advance in the connection claw portion 12 of the commutator 10, and the molten solder is soldered. This is a structure in which the groove 14 is filled by natural filling. Even in this case, since the brazing filler metal R is filled only into the pre-formed grooves 14, the amount of the brazing filler metal R deposited can be minimized and costs can be reduced.

In each of the above embodiments, the brazing material is attached to a commutator as a member to be connected, but the present invention is not limited to this, and can be applied to any member to be connected to which a connecting wire is connected by heat welding. For example, other members such as printed circuit boards can also be used. In this case as well, the brazing material is not deposited on unnecessary portions, and the amount of brazing material deposited can be kept to the minimum necessary, thereby reducing costs.

[Effects of the Invention] As explained above, the brazing filler metal adhesion method according to the present invention can reduce costs by minimizing the amount of brazing filler metal attached to connected members, and can reduce costs. It has the excellent effect of being able to achieve this with small and simple equipment.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the state of a commutator immediately before the brazing material is attached to the commutator to which the brazing material attaching method according to the first embodiment of the present invention is applied;
Fig. 2 is a view taken along the line ■-■ in Fig. 1 showing the edge of the connection claw;
Figure 3 is a cross-sectional view of the connecting claw section taken along line t-m in Figure 1, Figure 4 is a manufacturing process diagram showing the commutator manufacturing procedure, and Figure 5 (A
) to 5(E) are schematic diagrams of the commutator corresponding to the manufacturing process, Figure 6 is a front view of the commutator showing the brazing metal adhesion treatment state, and Figure 7 is a perspective view of the completed commutator. Figure 8 is a sectional view of the commutator taken along the line ■-■ in Figure 7, and Figure 9 (A).
9 to 9(E) are front views showing other examples of grooves formed in the wire connection claw portion, FIG. 10 is a back view showing other grooves formed in the edge of the wire connection claw portion, and FIG. 11 (A) and Figure 11 (B)
12 is a cross-sectional view corresponding to FIG. 3 showing another example of the groove formed in the connecting claw portion, FIG. FIG. 13 is a perspective view showing a schematic configuration of a brazing material adhesion method according to a third embodiment of the present invention, and FIG. 14 is an enlarged view of the main part of FIG. 13. DESCRIPTION OF SYMBOLS 10...Commutator, 12...Connection claw part, 12B...Edge, 14...Groove, 20.22...Horizontal groove, 24.26...Groove, 28.30.32. ...Horizontal groove, 34...Back groove, 36...Groove, 38...Through groove, 42.44... -Applying roller, 46...Wire solder, 48...Strowel (heat source), R...Brazing material. (A) (B) (C) (D) ・Brazing metal (E) 20.22 ・・Horizontal groove 24, G ・・Groove 28. 30. 32 ・・Horizontal groove (A) Fig. 2B 2B 12th・Back groove 36 ・・Groove 38 ・・Through groove 2B ・Wire soldering iron (heat source) 13th cause Fig. 14

Claims (1)

[Claims] (1) A brazing material attachment method for attaching a brazing material to a member to be connected to which a connecting wire is connected by heat welding, wherein the member to be connected is provided with a recess that communicates with at least a connection portion of the connecting wire. A method for attaching a brazing material, comprising: forming a brazing material, and then flowing a molten brazing material into the recess to fill only the recess with the brazing material.