JPH0343980A - Manufacture of multiple wire sliding brush material - Google Patents

Abstract

PURPOSE:To improve welding strength and stability by passing a bundle of wires through an arranging guide of the bundle at an inlet between both upper and lower roll electrodes, and seam-welding the bundle to the bar of a band base material while the arrangement is maintained. CONSTITUTION:When seam welding is done by pressure-energizing both the upper and lower roll electrodes 4, 5 with a flat circumference, a bundle of wires 2 is made to pass through an arranging guide 8 of the bundle 2 is installed at an inlet between the upper and lower electrodes 4, 5 so that bundle 2 is seam-welded to the bars 7 of a band base material 6 in order between both the upper and lower roll electrodes 4, 5 as the arranged condition of bundle 2 is kept. The brush wires 1 of the bundle 2 are therefore never loosened, overlapped, and swell out. As a result, it can be welded to the bars 7 in good accuracy, and thus the welding strength can be increased and stabilized.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method of manufacturing a material for making a multi-wire bundle sliding brush used for trimmers, potentiometers, etc.

(Prior Art) Conventionally, in order to manufacture a multi-wire bundle sliding brush material, a wire bundle 2 is prepared by horizontally aligning and converging a large number of brush wires 1 as shown in FIG.
, a groove 3 having the same width as the wire bundle 2 and shallower than the wire diameter of the brush wire l.
Each rung portion 7 of a ladder-like strip-shaped base material 6 is wound around an upper roll electrode 4' having a flat outer peripheral surface and fed from the same direction onto a lower roll electrode 5 having a flat outer peripheral surface. Seam welding is performed by applying pressure to the upper and lower roll electrodes 4' and 5.

(Problem to be Solved by the Invention) By the way, in the method for manufacturing the multi-wire bundle sliding brush material described above, the wire bundle 2 is wound around the groove 3 on the outer peripheral surface of the upper roll electrode 4' and fed, and the groove 3 is used to feed the wire bundle 2. Although it is used as a guide for groove 3
Because the machining is difficult, the accuracy is poor, and the upper and lower roll electrodes 4', 5
When welding the seam between the wire bundle 2 and the beam part 7 by applying current under pressure,
The brush wire (■) of wire bundle 2 was separated, overlapped, or protruded, and the welding strength was weak and unstable.

Therefore, the present invention aims to provide a method for manufacturing a multi-wire bundle sliding brush shed that prevents the brush wires from coming apart, overlapping, or protruding during seam welding between the wire bundle and the arm portion. .

(Means for Solving the Problems) In order to solve the above problems, the method for manufacturing a multi-wire bundle sliding brush material of the present invention is to produce a wire bundle in which a large number of brush wires are horizontally aligned and bundled on a ladder-like strip base material. In a method for manufacturing a multi-wire bundle sliding brush material in which seam welding is performed between upper and lower roll electrodes with a flat outer periphery on each arm, the wire bundle is passed through a bundle guide at the entrance between the two lower roll electrodes, This method is characterized by seam welding to the edge of the band-shaped base material while maintaining a uniform state.

(Function) As described above, in the method for manufacturing the multi-wire bundle sliding brush material of the present invention, the wire bundle is passed through the bundle guide at the entrance between the upper and lower roll electrodes, and the wire bundle is maintained in the bundled state at the end of the band-shaped base material. Since the brush wires of the wire bundle do not come apart, overlap, or protrude, and are precisely welded to the hem, the welding strength is high and stable.

(Example) An example of the method for manufacturing the multi-wire bundle sliding brush material of the present invention will be described. As shown in FIG.
μm Ag40%-Pd40%-Cu19.5%-P
A wire bundle 2 with a width of 1.6 mm made by horizontally aligning and condensing brush wires 1 made of 5% tO is placed at intervals of 2.5 mm in the longitudinal direction of a strip-shaped base material 6 made of phosphor bronze with a width of 11 mm and a thickness of 0.2 mm. A seam is formed by pressurizing and energizing both the upper and lower roll electrodes 4.5, which are made of CrO, 4%-Cu and have a flat outer circumferential surface and have a width of 12 mm and an outer diameter of 120 mm, on each of the provided 4 mm length and 0.6 mm width rod portions 7. During welding, the wire bundle 2 is passed through a bundle guide 8 provided at the entrance between the upper and lower roll electrodes 4.5, and while maintaining the bundled state, the wire bundle 2 is sequentially applied to the upper and lower ends of the band 7 of the strip-shaped base material 6. Seam welding was performed between the roll electrodes 4.5 to obtain a multi-wire bundle sliding brush material 9.

On the other hand, as a conventional example, as shown in FIG.
Cr0.4%-C with a width of 12 mm and an outer diameter of 120 mm, which has a flat rectangular groove 3 on the outer circumferential surface that is 40 μm shallower than the wire diameter.
It is wound around an upper roll electrode 4' consisting of U, and is fed with a width of 12 mm, which has a flat outer circumferential surface in the same direction.
Both the upper and lower roll electrodes 4' and 5 are applied to each of the strips 7 of the strip-shaped base material 6, which has the same dimensions and the same material as the embodiment, and is fed onto the lower roll electrode 5 made of CrO, 4%-Cu with an outer diameter of 120 mm. A multi-wire bundle sliding brush material 9' was obtained by seam welding by pressure energization.

When we measured the tensile strength of each brush wire in the thus obtained multi-wire bundle sliding brush materials of the example and the conventional example, and inspected the appearance of the brush wire, we obtained the results shown in the table below. .

As is clear from the table above, conventional multi-wire bundle sliding brush materials have large variations in tensile strength per brush wire, and appearance defects such as brush wires coming apart, overlapping, and protruding can cause IO discoloration. In contrast, the multi-wire bundle sliding brush material of the example had small variations in tensile strength per brush wire, and there were no appearance defects such as brush wires coming apart, overlapping, or protruding. Ta.

(Effects of the Invention) As can be seen from the above explanation, according to the method for manufacturing a multi-wire bundle sliding brush material of the present invention, each brush line of the wire bundle seam-welded to each step of the ladder-like strip base material is Welding occurs without unraveling, overlapping, or protruding, and the brush wires on both the left and right ends of the wire bundle hit the sides of the groove in the upper roll electrode, unlike conventional methods, so much heat is not lost to the electrodes. The welding strength of the brush wires becomes almost uniform, and a stable multi-wire bundle sliding brush material with small variations in tensile strength can be obtained.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of the method for manufacturing a multi-wire bundle sliding brush material of the present invention, and FIG. 2 is a perspective view showing a conventional method for manufacturing a multi-wire bundle sliding brush material. Figure 1 JP-A-3 43980 (3)

Claims (1)

[Claims] 1. In a method for manufacturing a multi-wire bundle sliding brush material, a wire bundle made by aligning and converging a large number of brush wires horizontally is seam-welded to each leg of a ladder-like strip base material between upper and lower roll electrodes with a flat outer peripheral surface. A method for manufacturing a multi-wire bundle sliding brush material, characterized in that the wire bundle is passed through a bundle guide at the entrance between the upper and lower roll electrodes, and the bundle is maintained in a bundled state and seam welded to the edge of a band-shaped base material.