JPH02165874A - Welding electrode for brush wire - Google Patents

Abstract

PURPOSE:To obtain stable brush wire with high welding strength by providing adjacently many parallel grooves having the same radius of curvature as the brush wire with circular cross sections to be seam-welded on the peripheral surfaces of rotary electrodes. CONSTITUTION:The parallel semiconductor grooves 2b are provided adjacently on the peripheral surface of the rotary electrode 2' having a flange 2a. This welding electrode 2' is made to the upper rotary electrode and a ladderlike and belt-like base material 3 having frame parts 3a providing with window holes 3b and the wire bundle 5 of the brush wire 4 thereon are fed between the upper rotary electrode 2' and the lower rotary electrode 1. The brush wire 4 are lined up and held by the semiconductor grooves 2b of the peripheral surface of the upper rotary electrode 2' and subjected to seam welding by pressurization and energization of the upper and lower rotary electrodes 2' and 1 to obtain belt-like sash contact point material. By this method, welding strength of the brush wire is higher than the conventional one and its variance is reduced and it is stable.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to an improvement in a welding electrode for seam welding a brush wire to a composite material in order to make brush contacts used in trimmers, potentiometers, etc.

(Prior Art) Conventionally, in order to seam weld a brush wire to a composite material to make a brush contact, a ladder-like wire is fed between a lower rotating electrode 1 and an upper rotating electrode 2 as shown in FIG. A brush wire 40 line 5, which is also fed parallel to and above the strip-shaped base material 3, is seam-welded to each contact portion 3a of the strip-shaped base material 3 by pressurizing and energizing the vertically rotating electrode 2.1. The thus produced strip-shaped brush contact material 6 is then transferred to a strip-shaped base material 3 as shown in FIG.
Cut out the left and right sides of the
A brush contact point 7 is made by cutting the wire bundle 5 at the outer edge of 3a.

(Problem to be Solved by the Invention) By the way, the wire bundle 5 of the brush wire 4 welded to each contact portion 3a of the ladder-shaped strip base material 3 is flattened at the welded portion as shown in FIG. Since it is plate-shaped, the welding strength is low and unstable, so when the brush contact 7 is assembled into a trimmer, potentiometer, etc., there is a risk that the brush wire 4 may break at the welded part during use. Ta. Furthermore, when the wire bundle 5 of the brush wire rods 4 welded to each contact portion 3'a of the ladder-like strip base material 3 was cut, the brush wire rods 4 sometimes came apart in the vertical and horizontal directions.

SUMMARY OF THE INVENTION Therefore, the present invention provides a welding electrode for brush wires that can maintain high and stable welding strength of brush wires and that can be welded so that the brush wires do not fall apart vertically or horizontally when the brush wires are cut by a welding machine. This is what I am trying to do.

(Means for Solving the Problems) In order to solve the above problems, the brush wire welding electrode of the present invention has parallel grooves on the outer peripheral surface of the rotating electrode having the same radius of curvature as the brush wire having a circular cross section to be seam welded. It is characterized by the fact that a large number of them are provided adjacent to each other.

(Function) When the brush wire welding electrode with the above structure is used as an upper rotating electrode to weld a wire bundle of brush wire to each side of a ladder-like strip base material, the brush wire and the brush wire are attached to the outer peripheral surface of the electrode. Since many grooves with the same radius of curvature are arranged adjacent to each other in parallel, when the brush wire is aligned and held by the grooves and seam welded to each side of the composite material by applying pressure and electricity to both the upper and lower electrodes, Each side of the composite material is welded with ease and precision, and the upper side on the other side maintains a circular shape and does not collapse into a flat plate like in the past, resulting in high welding strength and stability.

In addition, since the brush wires are seam welded while being aligned and held by the grooves on the outer peripheral surface of the electrode as described above, no deformation stress is applied to the brush wires, so when the bundle of brush wires is cut, the brush wires are It does not come apart in the vertical direction.

(Example) An example of the welding electrode for brush wire of the present invention is shown in Fig. 1a,
To explain by b, the diameter is 12On++n and the width is 10I.
TII11, width 4.46mm, height 0.04mm on both sides
Cr-Cu99.5 with 5mm flange 2a
Twelve semicircular grooves 2b having a radius of curvature of 0.045 mm are provided in parallel and adjacent to each other on the outer peripheral surface of the rotating electrode 2' made of wt% alloy.

The welding electrode 2' having such a structure is used as an upper rotating electrode as shown in Fig. 2, and a C.
Lower rotating electrode 1 made of r-Cu99.5wt% alloy
There is a window hole 3b with a width of 13+n+n and a thickness of 0.1 mm, which is 6.0 mm long and 3.6 mm wide in the longitudinal direction, and has a width of 1.0 mm and a length of 6.0 mm. Cu with lateral portion 3a of O+nm
- Ladder-shaped strip base material 3 made of 30wt% Ni and A g -P d 40w with a wire diameter of 0.09+nm above it.
A wire bundle 5 of 12 brush wires 4 made of t%-Cu 2ht% is fed, and the brush wires 4 are aligned and held by the semicircular groove 2b on the outer circumferential surface of the upper rotating electrode 2', and the vertically rotating electrode 2
', 1 was seam welded by applying pressure and electricity to produce a band-shaped brush contact material 6'. Thereafter, as shown in FIG. 3, the left and right sides of the band-shaped base material 3 were cut off, and the wire bundles 5 were cut at the outer edges of each type 13a as shown in FIG. 4 to form brush contacts 7'.

On the other hand, as a conventional example, as shown in FIG. 5, a welding electrode having the same dimensions and the same material as the embodiment without a semicircular groove on the outer periphery is used as the upper rotating electrode 2, and a lower part having the same dimensions and the same material as the embodiment. Between the electrode 1 and the same ladder-shaped strip base material 3 as in the example
and above it, a wire bundle 5 of 12 brush wire rods 4, which is the same as in the example.
was fed, and seam welding was performed by pressurizing and energizing the vertically rotating electrode 2 and (2) to produce a band-shaped brush contact material 6. Thereafter, as shown in FIG. 6, the left and right sides of the strip-shaped base material 3 were cut off, and the wire bundle 5 was cut at the outer edge of each lateral portion 3a as shown in FIG. 7 to form brush contacts 7.

When we inspected the welded part of the brush wire 4 of the brush contacts of the embodiment and the conventional example made in this way, it was found that the thickness of the conventional example was 0.0.
The thickness of the example was 0.07 mm, while the thickness of the example was 0.07 mm, and although there was a collapse of 0.02 mm on the welding side, the top side maintained a circular shape.

Furthermore, the welding strength and state of disintegration of the brush wire 4 at 1000 brush contacts were measured, and the results shown in the table below were obtained.

*Welding strength is per brush wire.

As is clear from the above table, the welding strength of the brush wire of the brush contact of the example is higher than the welding strength of the brush wire of the brush contact of the conventional example, and it can be seen that it is stable with little variation. In addition, as many as 20 out of 1,000 pieces of the conventional brush contact had vertical and horizontal dispersion of 0.1 or more in the brush wire, whereas the brush contact of the embodiment had such vertical and horizontal dispersion of the brush wire of 0.1 or more.
There was no difference between the left and right sides.

The welding electrode for brush wire of the present invention is not only used to weld the brush wire perpendicularly to the base material (contact part), but also used when welding the brush wire in parallel with the composite material. .

(Effects of the Invention) As can be seen from the above explanation, according to the welding electrode for brush wire of the present invention, when a bundle of brush wire is welded to a composite material, the welded part of the brush wire is accurately welded and flattened. Therefore, the welding strength is high and stable. Further, during welding, no deformation stress is applied to the brush wire, and therefore, when the wire bundle of the brush wire is cut, the brush wire does not come apart vertically or horizontally, so that a brush contact of good quality can be obtained.

[Brief explanation of the drawing]

Fig. 1 aSb is a longitudinal sectional view and a side view showing an embodiment of the welding electrode for brush wire of the present invention, and Fig. 2 is a perspective view showing a state in which a band-shaped brush contact is made using the welding electrode. , Fig. 3.4 is a perspective view showing the process of making individual brush contacts from a band-shaped brush contact material, and Fig. 5 is a perspective view showing a state in which a band-shaped brush contact material is made using a conventional welding electrode. , 6th
．． FIG. 7 is a perspective view showing the process of making individual brush contacts from a band-shaped brush contact material, and FIG. 8 is a sectional view taken along the line AA in FIG. 6.

Claims (1)

[Claims] 1. An electrode for welding a brush wire rod, characterized in that a large number of parallel grooves having the same radius of curvature as the brush wire rod with a circular cross section to be seam welded are provided adjacent to each other on the outer peripheral surface of the rotating electrode.