JPH0217889B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a method for welding brush wire at sliding contacts.

Conventionally, in order to manufacture a sliding contact, first, as shown in FIG.
and a mounting portion 2a are formed, and a projection 3 is formed on the beam 2. Next, this strip-shaped base material 1 is fed straight through a base material guide 4 by a feeder (not shown), and the strip 2 is placed on the lower electrode 5 as shown in FIG. Guide 7
It is arranged and fed through the strips and placed on the beam 2 of the strip-shaped base material 1. Next, as shown in FIG. 1c, the brush wires 6 are simultaneously projection welded to the beam 2 of the strip-shaped base material 1 by applying pressure to the upper electrode 8. Next, as shown in FIG. 1d, the strip-shaped base material 1 is sent out, its left and right ends are cut off, and a large number of brush wires 6 are cut to a required length to obtain a sliding contact material 9. Next, the tips of the many brush wires 6 of this sliding contact material 9 were molded to form a semicircular curved portion 10 on the lower side, as shown in FIG. 1e, to form a sliding contact 11. .

However, in this method of manufacturing a sliding contact, there is a problem in that when a large number of brush wire rods 6 are welded to the slats 2 of the strip-shaped base material 1, the welding positions are shifted in the left-right direction and variations occur. In addition, the welding strength was low and varied widely, making it unstable.

This is because when the strip-shaped base material 1 and a large number of brush wire rods 6 are fed, there is a gap between the base material guide 4 and the wire guide 7, so when the strip-shaped base material 1 and a large number of brush wire materials 6 are fed to the welding position between the upper and lower electrodes 8 and 5, the strip-shaped Base material 1 and a large number of brush wire materials 6
This is because the parts are shifted in the left-right direction and then welded as they are.

The present invention has been made to solve the above problem, and it is possible to weld a large number of brush wires to a base material accurately at a predetermined position without shifting in the left and right direction when resistance welding a large number of brush wires to a base material. Moreover, it is an object of the present invention to provide a welding method for brush wires that can provide high and stable welding strength.

An example of the welding method for brush wire according to the present invention will be explained below with reference to the drawings. As shown in FIG. Insert 2 and mounting part 2
A, a projection 3 is formed on the rod 2, and a required number of semicircular grooves 3a are provided perpendicularly to the projection 3 for fitting and arranging brush wires in the projection 3. Next, this strip-shaped base material 1 is fed straight through a base material guide 4 by a feeder (not shown), and the strip 2 is placed on the lower electrode 5 as shown in FIG. The wire rod guide 7 is arranged to feed the wire rod 1 to the band 2.
It is positioned by fitting into the groove 3a provided in the upper projection 3. Next, as shown in FIG. 2c, each brush wire 6 is resistance-welded to the slat 2 of the strip-shaped base material 1 all at once by applying pressure to the upper electrode 8.

A large number of brush wires 6 welded in this way are
Even if there is a gap between the base material guide 4 and the wire guide 7, when it is fed into the welding position between the upper and lower electrodes 8 and 5, it will fit into the groove 3a of the projection 3 on the rod 2 of the strip-shaped base material 1. Since they are arranged and positioned and restrained at predetermined positions, the welding positions of the required number of brush wires 6 to the strip base material 1 do not shift in the left-right direction, and welding is performed accurately at the predetermined positions and the welding strength is high. , it becomes stable with little variation.

Next, in order to clarify the effects of the brush wire welding method according to the present invention, specific examples and conventional examples thereof will be described.

Example As shown in Figure 2a, a Cu-
4 at regular intervals on a strip-shaped base material 1 made of Ni30w/o
A horizontally convex hole 1a with a width of mm is punched out to form a sill 2 with a width of 5 mm and a length of 1.5 mm in the longitudinal direction, and a mounting part 2a with a width of 3 mm and a length of 3 mm, and a height of 0.05 mm on the sill 2.
A semicircular groove 3a with a radius of 0.05 mm is formed perpendicularly to the projection 3 to form a projection 3 with a width of 0.08 mm and a length of 3 mm. Set a number. Next, this strip-shaped base material 1 is fed straight through the base material guide 4 using a feeder (not shown), and the strips 2 are placed on the lower electrode 5 as shown in FIG. 10w/oPt−10w/oAu−30w/oAg−
Brush wire rods 6 made of 35w/oPd-14w/oCu-1w/oZn alloys are arranged and fed through the wire guide 7 to fit into the grooves 3a provided in the projections 3 on the rods 2 of the strip-shaped base material 1. position. Next, as shown in FIG. 2c, each brush wire 6 was simultaneously projection welded to the beam 2 of the strip-shaped base material 1 by applying pressure and electricity to the upper electrode 8.

Thereafter, as shown in FIG. 1d, the strip-shaped base material 1 is sent out and its left and right ends are cut off, and 20 brush wires 6 are cut to a length of 3.9 mm from the position of the rod 2, and the sliding contact material 9 is cut. get. Next, the tips of the 20 brush wires 6 of this sliding contact material 9 are molded all at once to form a 0.2 mm lower part as shown in FIG. 1e.
A sliding contact 11 is formed by forming a semicircular curved portion 10 of R.
I got it.

Conventional example As shown in Figure 1a, Cu-
4 at regular intervals on a strip-shaped base material 1 made of Ni30w/o
A laterally convex hole 1a with a width of mm is punched out to form a 5mm wide and 1.5mm long sill 2 in the longitudinal direction and a mounting part 2a with a width of 3mm and a length of 3mm, and the height above the sill 2 is 0.05 mm.
A projection 3 with a width of 0.08 mm and a length of 3 mm is formed. Next, this strip-shaped base material 1 is fed straight through a base material guide 4 by a feeder (not shown) to the first
As shown in Figure b, the rod 2 is placed on the lower electrode 5, and 20 10w/oPt-10w/
oAu−30w/oAg−35w/oPd−14w/oCu−
Brush wire rods 6 made of a 1w/oZn alloy are fed in an array through a wire guide 7 and placed on the projection 3 on the rod 2 of the strip-shaped base material 1. Next, as shown in FIG. 1c, by applying pressure to the upper electrode 8, the projections of each brush wire 6 were simultaneously welded to the beam 2 of the strip-shaped base material 1.

Thereafter, as shown in FIG. 1d, the strip-shaped base material 1 is sent out and its left and right ends are cut off, and 20 brush wires 6 are cut to a length of 3.9 mm from the position of the rod 2 to obtain a sliding contact material 9. . Next, this sliding contact material 9
The tips of the 20 brush wires 6 were formed all at once to form a semicircular curved portion 10 with a radius of 0.2 mm on the lower side, as shown in FIG. 1e, to obtain a sliding contact 11.

However, when quality was inspected for each of 100 sliding contacts obtained by the method of the example and the conventional example, it was found that in the sliding contact 11 of the example, the entire 20 brush wires 6 were shifted in the left-right direction with respect to the base material. The sliding contact was of good quality and had high dimensional accuracy, with no parts welded to the ground, and all of the contacts were accurately welded at predetermined positions.In contrast, the sliding contact 11 of the conventional example had 20 brushes. Wire rod 6
There were 13 welded contacts that were welded with a deviation of 0.2 mm or more in the left-right direction relative to the base material, and there were many variations in welding positions, resulting in poor quality sliding contacts 11 with low dimensional accuracy.

Furthermore, the welding strength of the brush wire 6 of the sliding contact 11 of the embodiment was high and stable with little variation, whereas the welding strength of the brush wire 6 of the sliding contact 11 of the conventional example was low and had a lot of variation. It was unstable.

In the above embodiment, the projection 3 is provided on the beam 2 of the strip-shaped base material 1, and the projection 3 is
A semicircular groove 3a is provided in the projector 3, but this semicircular groove 3a is not provided in the projection 3, but is provided directly on the rod 2, and the brush wire 6 is fitted into this semicircular groove 3a. By arranging them together and performing resistance welding, it is possible to prevent the welding position of the entire brush wire 6 from shifting in the left-right direction with respect to the base material in the same way as described above, and moreover, it is possible to make the welding strength high and stable. Also, the brush wire 6
The base material to be welded is not limited to the beam 2 obtained by pressing out the band-shaped base material 1, but may be a base material that has been cut into a predetermined shape in advance.

As described in detail above, the method for welding brush wires in the sliding contact of the present invention involves providing a required number of semicircular grooves in which the brush wires are fitted and arranged in the brush wire welding portion of the base material, and Since the brush wires are fitted and arranged in the grooves, positioned and restrained, and resistance welded to the base material, the brush wires as a whole will not be welded horizontally relative to the base material, and will all be in the specified position. Welding is performed accurately, and the welding strength is high and stable with little variation. Therefore, there is an excellent effect that a sliding contact with high dimensional accuracy and good quality can be obtained.

[Brief explanation of drawings]

Figures 1 a to e are diagrams showing the steps of a conventional method for manufacturing a sliding contact, and Figures 2 a, b, and c are diagrams showing an example of the steps of a method for welding brush wire in a sliding contact of the present invention. It is a diagram. 1...Band-shaped base material, 2...Ban, 2a...Mounting part,
3...Projection, 3a...Semicircular groove,
4... Base material guide, 5... Lower electrode, 6... Brush wire, 7... Wire guide, 8... Upper electrode, 9...
... Sliding contact material, 10... Curved portion, 11... Sliding contact.

Claims (1)

[Claims] 1. A required number of semicircular grooves for fitting and arranging the brush wires are provided in the welded part of the brush wire of the base material, and this base material is fed to place the welded part of the brush wire on the lower electrode and the required number of semicircular grooves are provided. The brush wires are arranged and fed, fitted into the grooves of the brush wire welding part of the base material, arranged and positioned, and then each brush wire is resistance welded to the base material all at once by pressurizing and energizing the upper electrode. Characteristic method of welding brush wire at sliding contacts.