JPH03110772A - Manufacture of multiwire bundle sliding brush element - Google Patents

Abstract

PURPOSE:To make the welding strength of the brush wires of a wire bundle almost even by reducing the section area of heat conductive passages at the both outer sides of the welding scope of the wire bundle on the crosspieces of a belt-form base member so as to suppress the heat escaping from the crosspieces in the seam-welding. CONSTITUTION:Circular holes 8 of the diameter 0.3mm are engraved at the both outer sides of the welding scope 7a of a wire bundle on the crosspieces 7 of a belt-form base member 6 to reduce the section area of the heat conductive passages at the parts, and the wire bundle 2 is seam-welded to the welding scope 7a of the crosspieces 7 between the upper and the lower roll electrodes 4 and 5. Since the section area of the heat conductive passages at the both outer sides of the welding scope 7a of the wire bundle 6 is reduced in such a way, the heat at the brush wires 1 at the both sides generated by the seam- welding hardly escapes through the crosspieces 7, and the temperature of the brush wires 1 at the both sides is made almost equal to that of the brush wire 1 at the center. Consequently, the welding strength is stabilized, and the welding strength of the brush wires 1 of the wire bundle 2 is made almost even.

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-line bundle sliding brush material, 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 between both roll electrodes 4.5.

(Problem to be Solved by the Invention) By the way, when the wire bundle 2 and the rod portion 7 are seam welded, when each brush wire 1 and the rod portion 7 generate heat, the heat escapes through both roll electrodes 4.5. , some of it escapes to both sides of the strip-shaped base material 6, and the temperature distribution in the ridge portion 7 is as shown in FIG. For this reason, the temperature of the brush wires l on both the left and right sides of the wire bundle 2 is lower than that of the brush wire 1 in the center, and the welding area of each brush line 1 with respect to the beam part 7 becomes as shown in FIG. The welding strength of the brush wire 1 was unstable.

SUMMARY OF THE INVENTION Therefore, the present invention provides a method for manufacturing a multi-wire bundle sliding brush material that suppresses the heat of the brush wire that is seam welded between the wire bundle and the rim portion to escape through both sides of the strip-shaped base material. .

(Means for Solving the Problems) In order to solve the above-mentioned 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 lines are horizontally aligned and condensed, and a brush line with the same width as the wire bundle. The material is wound around a roll electrode having a groove shallower than the wire diameter on the outer circumferential surface, and is fed from the same direction onto the roll electrode having a flat outer circumferential surface. In the method for manufacturing a multi-wire bundle sliding brush material in which seam welding is performed between both roll electrodes, the cross-sectional area of the heat transfer path on both the left and right outside of the welding range of the wire bundle in each leg of the strip-shaped base material is reduced, The present invention is characterized in that heat escaping from the seam portion during seam welding is suppressed.

(Function) As described above (in the manufacturing method of the multi-wire bundle sliding brush material of the present invention, the cross-sectional area of the heat transfer path on both the left and right outside of the welding range of the wire bundle in each arm of the band-shaped base material is reduced, The heat generated by the brush wires on both the left and right sides due to seam welding becomes difficult to escape from the hem, so the temperature of the brush wires on both the left and right sides is the same as that between the center brush line and the path, and the welding strength becomes stable. The welding strength of each brush line in the wire bundle becomes substantially uniform.

(Example) Example 1 of the method for manufacturing a multi-wire bundle sliding brush material of the present invention will be described as shown in FIG.
μm Ag40%-Pd40%-Cu19.5%-Pt
Width 1 of horizontally aligned and focused brush lines 1 consisting of 0.5%
．． A wire bundle 2 of 6 mm is placed in an upper part made of Cr1.8%-Cu with a width of 12 mm and an outer diameter of 120 mm, which has a flat rectangular groove 3 of 40 μm in the outer circumferential surface with the same width as the wire bundle 2 and shallower than the wire diameter of the brush wire l. Wrap around roll electrode 4 and feed speed 1000
mm/min, and this is fed from the same direction to a Cr1.
Width 1 fed onto the lower roll electrode 5 made of 8%-Cu
Band-shaped base material 6 made of phosphor bronze with a thickness of 2 mm and a thickness of 0.2 mm.
length 4mm provided at 2.5mm intervals in the longitudinal direction,
When seam welding is performed between the upper and lower roll electrodes 4.5 on each 0.6 mm width ridge portion 7, a diameter 0. ．．
A 3no++ circular hole 8 is drilled to reduce the cross-sectional area of the heat transfer path in this part, and the wire bundle 2 is seam-welded between the upper and lower roll electrodes 4.5 to the welding range 7a of each arm portion 7 to form a multi-wire bundle. A sliding brush material 9 was obtained.

Embodiment 2 will now be described. As shown in FIG. 2, a wire bundle 2 having the same dimensions and the same material as Embodiment 1 is provided at each of the beams 7 of the strip-shaped base material 6 having the same dimensions and the same material as Embodiment 1. Width 0.2 mm 1 depth 0.1 m on both left and right outside of welding range 7a
A V-groove lO of m is provided in parallel with the wire bundle 2 to reduce the cross-sectional area of the heat transfer path in this part, and the wire bundle 2 is connected to the welding range 7 of each arm portion 7.
A was seam welded between the upper and lower roll electrodes 4.5 as in Example 1 to obtain a multi-wire bundle sliding brush material 11.

Next, to explain Example 3.4.5.6, the third
As shown in FIG. 4, FIG. 5, and FIG. 6, the same dimensions as in Example 1 in each of the strap portions 7 of the strip-shaped base material 6 having the same width, the same thickness, and the same material as in Example 1, Wire bundle 2 made of the same material
The left and right side portions 7b of the welding range 7a are made thinner than the welding range 7a to reduce the cross-sectional area of the heat transfer path of the welding range 7b, and the wire bundle 2 is applied to the welding range 7a of each leg portion 7. Similar to Example 1, the upper and lower roll electrodes 4.5 were seam welded to obtain multi-wire bundle sliding brush materials 12, 13, 14, and 15.

Multi-wire bundle sliding brush materials of Examples 1 to 6 thus obtained 9.
11.12.13.14.15, 1 of the brush wire l in the conventional multi-wire bundle sliding brush material shown in FIG. When the true tensile strength was measured, the results shown in the table below were obtained.

(Leaving space below) As is clear from the table above, the conventional multi-wire bundle sliding brush material has large variations in tensile strength per brush wire, while the multi-wire bundle sliding brush material of the embodiment line 1
It can be seen that the variation in the actual tensile strength is small.

This simply reduces the cross-sectional area of the heat transfer path on both the left and right outside of the welding range of the wire bundle in each leg of the band-shaped base material, and suppresses the heat escaping from the leg during seam welding of the wire bundle and the leg. This is because the entire wire is heated equally and the welding strength is stabilized.

(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 a ladder-like strip base material is welded. This has the effect that the strength can be made almost uniform, and a stable multi-wire bundle sliding brush material with small variations in the tensile strength of the brush wires can be obtained.

[Brief explanation of drawings]

1 to 6 are diagrams showing an embodiment of the method for manufacturing a multi-wire bundle sliding brush material of the present invention, respectively. FIG. 7 is a diagram showing a conventional method for manufacturing a multi-wire bundle sliding brush material, and FIG. Figure 9 shows the temperature distribution at the edge of the strip-shaped base material in the conventional manufacturing method.
The figure is a diagram showing the welding area of each brush wire of the wire bundle with respect to the edge portion in a conventional manufacturing method.

Claims (1)

[Claims] 1. A bundle of many brush wires arranged and focused horizontally is wound around a roll electrode having a groove on the outer circumferential surface with the same width as the brush wire and shallower than the wire diameter of the brush wire, and is fed from the same direction to a flat outer circumference. In a method for manufacturing a multi-wire bundle sliding brush material, each step of the band-like base material is seam welded between both roll electrodes to each step of a ladder-like band-like base material fed onto a roll electrode having a surface. A method for manufacturing a multi-wire bundle sliding brush material, characterized in that the cross-sectional area of the heat transfer path on both left and right outer sides of the welding range of the wire bundle is reduced to suppress heat escaping from the edge portion during the seam welding.