JPH0676914A - Manufacture of brush contact - Google Patents

Abstract

PURPOSE:To stabilize contactness between sliding surfaces without reducing the sliding surfaces so as to enhance a using yield of noble metal by welding comb tooth contact portions to the tip of a spring member where a plurality of circular contact wire rods made of noble metal are formed on a band member by punching, and press-forming it into a flat shape. CONSTITUTION:A band member 10 made of nickel silver is fed intermittently, and a spring member 11 is such formed by punching as that a lateral projection remains. Three contact wire rods 12 each made of 50% of Ag-Pd are arranged at predetermined intervals at the tip of the spring member 11, where the base ends thereof are welded. Portions of the wire rod 12, projected from the spring member 11 is press-formed into a flat cross section. The base end of the spring member 11 is cut in the band member 10, thus obtaining a brush contact 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a comb-shaped brush contact for contacting a commutator, a slip ring or the like.

[0002]

2. Description of the Related Art Conventionally, in order to manufacture a comb tooth-shaped brush contact for the above-mentioned use in an automated line, as shown in FIG. 4, a clad strip material 1 in which a precious metal contact material 1a is inlaid on a base metal spring material 1b. Is intermittently transferred to sequentially press out two slits 2 in the comb-teeth-shaped contact portion, and then press a long slit 3 having a wider width on both sides so as to sandwich the two slits 2. Then, one end of each of the slits 2 and 3 is punched out so as to be orthogonal to each other to form a comb-tooth-shaped convex portion 4 remaining, and thereafter the base ends of the comb-tooth-shaped convex portions 4 are clad by press punching. Separated from the strip 1, the comb-shaped brush contact 5 shown in FIG. 5 is formed.

By the way, in the above-described method of manufacturing the brush contact, the press contacting process is performed until the comb tooth-shaped convex portion 4 is left, so that the contact portion of the comb tooth is likely to be tilted, stepped, or burred. The contact property of is not stable. Since the clad strip 1 in which the noble metal contact material 1a is inlay-bonded to the base metal spring material 1b is punched out, a large amount of scrap is generated, and therefore the yield of use of the noble metal contact material 1a is extremely poor. Since a large amount of scrap is generated, it is expensive and time-consuming to recover precious metals. There are many press-cutting man-hours for the clad strip 1,
Equipment costs such as press dies are high.

[0004]

Therefore, according to the present invention, it is possible to stabilize the contact property of the sliding surface without reducing the sliding area, increase the yield of use of the noble metal contact material, and recover the noble metal. It is an object of the present invention to provide a method for manufacturing a brush contact, which can eliminate the cost, further reduce the processing man-hour, reduce the equipment cost, and improve the productivity.

[0005]

SUMMARY OF THE INVENTION In the method of manufacturing a brush contact according to the present invention for solving the above-mentioned problems, a strip material is intermittently transferred to sequentially form a spring portion by punching, and then the spring portion is formed. A plurality of circular contact wire rods made of noble metal are arranged side by side at regular intervals on the tip of each part, and the base ends are welded, and then the portions of the contact wire rods protruding from the spring portion are flatly press-molded. However, after that, the base end of the spring portion is cut from the strip.

[0006]

As described above, in the method of manufacturing the brush contact of the present invention, the contact portion of the comb tooth is formed on the tip end portion of the spring portion remaining formed on the strip material by press punching a plurality of circular contact wire rods. Since it is welded and press-formed into a flat shape, there is almost no tilt, step, or burr on the contact part of the comb teeth, the end surface is smooth, and the sliding area is not reduced. Therefore, the contact property of the sliding surface is stable, and the commutator, the slip ring and the like facing each other are hardly worn. Further, as described above, scrap is not generated when manufacturing the contact portion of the noble metal comb teeth, so that the yield of use of the noble metal can be increased and the recovery of the noble metal can be eliminated. Further, since the number of working steps for punching is reduced as compared with the conventional method, the equipment cost is reduced and the productivity is improved.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the method for manufacturing brush contacts of the present invention will be described with reference to FIG. 1. A strip material 10 made of nickel silver having a width of 18 mm and a thickness of 0.08 mm is intermittently transferred and sequentially pressed to release a spring. The part 11 was formed to remain laterally in a convex shape. Next, a plurality of, in this example, three, a wire diameter of 0.12 mm and a length of 4.5 mm, of contact wire 12 made of Ag-Pd50% and having a wire diameter of 0.12 mm are arranged in parallel at 0.28 mm intervals at the tip of the remaining spring portion 11. The base end is 0.8 mm long
Welded over. Then, the portions of the three contact wire rods 12 projecting from the spring portion 11 are press-molded over a length of 3.5 mm to have a thickness of 0.08 mm and a width of 0.18 mm as shown in FIG.
It has a flat cross section. Then, as shown in FIG. 1, the spring portion 11
The base end of was cut from the strip material 10 to obtain the brush contact 13 shown in FIG.

On the other hand, the conventional example will be described with reference to FIG.
A clad strip 1 made by inlaying 0.04 mm thick and 2 mm wide Ag-Pd50% contact material 1a to 0.08 mm thick and 18 mm wide nickel-white spring material 1b is intermittently transferred and sequentially inlaid. Two slits 2 having a width of 0.25 mm and a length of 6 mm were punched out at intervals of 0.21 mm so as to intersect the portion. Next, a slit 3 having a width of 0.28 mm and a length of 12 mm was punched on both sides so as to sandwich the slit 2 with a gap of 0.21 mm from the slit 2. Next, the slits 2 and 3 were punched out so that one ends thereof were orthogonal to each other, and the comb-tooth-shaped convex portions 4 were formed. After that, the base end of the comb-teeth-shaped convex portion 4 was separated from the clad strip 1 by press punching to obtain a comb-teeth-shaped brush contact 5 as shown in FIG.

As a result of inspecting the contact portion of each of the 100 brush contacts of the example and the conventional example thus manufactured, the following Table 1 is shown.
The results shown in are obtained.

[0010]

[Table 1]

As is clear from Table 1 above, the brush contact of the conventional example has a contact portion with a tilt, a step, and a burr, which are large, whereas the brush contact of the embodiment has a contact portion with a tilt. It can be seen that no step occurs, the step is extremely small, and no flash occurs.

[0012]

As described above, according to the method of manufacturing a brush contact of the present invention, there is almost no inclination, step, burr or the like at the contact portion of the comb teeth, the end face is smooth, and the sliding area is reduced. Therefore, it is possible to obtain a brush contact in which the contactability of the sliding surface is stable and the abrasion of the commutator, slip ring, etc. facing each other can be extremely reduced. Further, since scrap is not produced when the contact portion of the noble metal comb teeth is produced, the yield of use of the noble metal contact material is increased and it is not necessary to recover the noble metal. Furthermore, because the processing man-hours for removing the press are smaller than those of conventional manufacturing methods,
Equipment costs are reduced and productivity is improved.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of a method for manufacturing brush contacts of the present invention.

FIG. 2 is an enlarged cross-sectional view taken along the line AA of FIG.

FIG. 3 is a perspective view showing a brush contact obtained by the manufacturing method of the present invention.

FIG. 4 is a diagram showing a conventional brush contact manufacturing method.

FIG. 5 is a perspective view showing a brush contact obtained by a conventional manufacturing method.

[Explanation of symbols]

 10 Band material 11 Spring material 12 Contact wire material 13 Brush contact

Claims (1)

[Claims] 1. A strip member is intermittently transferred and sequentially pressed to form a spring portion, and a circular contact wire made of a plurality of noble metals is arranged in parallel at a predetermined interval at the tip of the spring portion. The base end portion of the contact wire is welded, the portions of the plurality of contact wire rods projecting from the spring portion are press-molded into a flat shape, and then the base end of the spring portion is cut from the strip material. Method of manufacturing brush contacts.