JPH0139603B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a method of manufacturing a sliding contact.

Conventionally, in order to make a sliding contact, the tip of a strip-shaped base material 1 is punched out in the shape of a comb tooth as shown in FIG. Resistance welding is performed, and then the brush wire 2 and the strip base material 1 are cut to a required length as shown in FIG. 1c, and then the tip of the brush wire 2 is shaped as shown in FIG. A semicircular curved portion 2a was formed.

By the way, in this method of manufacturing a sliding contact, when the brush wire rod 2 is welded, the welding heat causes the welded portion to locally soften and sag, or stress deformation such as thermal distortion occurs, resulting in the brush wire rod being welded. When molding the brush wire 2, there were cases where the brush wire 2 broke at the welded part at the root or the brush wire 2 lost its springiness.

The present invention has been made to solve these problems, and aims to provide a method for manufacturing a sliding contact that does not cause the brush wire to break or lose its springiness.

The manufacturing method of the sliding contact of the present invention is as shown in FIG. 2a, by punching out the tip of the strip-shaped base material 5 into a comb-teeth shape using a press, and the front half of each tooth 6 is shown in FIG. 2b. The U-shaped portion 6a of each tooth 6 is drawn in a mold (not shown) as shown in Fig. 2c.
As shown in the figure, the brush wire 7 is fed into the U-shaped portion 6a.
Caulk the upper sides of both sides of each brush wire 7 to the brush wire 7.
is held and fixed, and then the strip-shaped base material 5 is held and fixed, leaving a required dimension behind the comb tooth part, and also having a required length from the holding and fixing part of each brush wire 7, as shown in FIG. 2d. After cutting, the front end of each brush wire 7 is formed as shown in FIG. 2e to form a semicircular curved portion 7a on the lower side to obtain a sliding contact 8.

As described above, in the method for manufacturing a brush contact of the present invention, the brush wire 7 is not welded to the band-shaped base material 5, but is fed into the U-shaped portion 6a of each tooth 6 of the comb-like base material 5, and the U-shaped Since the part 6a is held and fixed by caulking on both sides of the upper part, stress deformation such as thermal distortion does not occur, and therefore, when the brush wire material 7 is formed, the spring properties of the brush wire material 7 are not lost. In addition, since the brush wire 7 does not locally soften and sag due to welding heat, the brush wire 7 does not break at the base when the brush wire 7 is formed. Since the holding and fixing by caulking is performed within the mold, each brush wire 7 is attached to the base material 5 straight, parallel and horizontally without being tilted in the left-right direction or the up-down direction.

Next, in order to clarify the effects of the method for manufacturing a sliding contact according to the present invention, specific examples and conventional examples thereof will be described.

Example As shown in Fig. 2a, the tip of a band-shaped base material 5 made of phosphor bronze with a width of 3.85 mm and a thickness of 0.15 mm is punched out into a comb-like shape using a press to form teeth 6 with a length of 5 mm and a width of 0.7 mm.
Four teeth are formed at 0.35 mm intervals, and the front half of each tooth 6 is 2 mm long and has a width of 0.7 mm as shown in Fig. 2b.
The U-shaped portion 6a of each tooth 6 is drawn to have a diameter of 0.12mm as shown in Figure 2c.
35w/o Pd-10w/o Pt-10w/o Au
-30w/o Ag-14w/o Cu-1w/o A brush wire 7 made of Zn alloy is fed into the U-shaped portion 6a.
Caulk the upper sides of both sides of each brush wire 7 to the brush wire 7.
was held and fixed, and then the band-shaped base material 5 was left 4 mm behind the comb tooth part, and each brush wire 7 was cut to a length of 5 mm from the holding and fixed part as shown in FIG. 2d. Thereafter, the front end of each brush wire 7 was molded as shown in FIG. 2e to form a semicircular curved portion 7a with a radius of 2 mm on the lower side, thereby obtaining a sliding contact 8.

Conventional Example As shown in Fig. 1a, the tip of a band-shaped base material 1 made of phosphor bronze with a width of 2.65 mm and a thickness of 0.15 mm is punched out into a comb-like shape using a press to form teeth 1a with a length of 5 mm and a width of 0.4 mm. of
Four pieces are formed at 0.35 mm intervals, and then a diameter of 5 mm is formed on each tooth 1a as shown in Figure 1b.
0.12mm 35w/o Pd-10w/o Pt-10w/o
Au-30w/o Ag-14w/o Cu-1w/o
Brush wire rods 2 made of Zn alloy are resistance welded, and then the band-shaped base material 1 is left 4 mm behind the comb tooth portion, and each brush wire rod 2 is held at a length of 5 mm from the holding and fixing portion as shown in Fig. 1c. After that, the front end of each brush wire 2 is formed as shown in FIG. Obtained.

However, when quality was inspected for each 100 sliding contacts obtained by the manufacturing method of the example and the conventional example, it was found that the sliding contact 8 of the example had breakage of the brush wire 7 and loss of springiness (after the molding process). There are no defective products such as those that cannot be returned to the original state.Furthermore, the brush wire 7 is installed straight, parallel, and horizontally on the base material 5 without tilting in the left-right direction or the up-down direction, and all slides are of good quality. In contrast to the conventional sliding contact 3, there were 42 defective products in which the brush wire 7 was broken, the spring properties were lost, and the brush wire 7 was installed tilted in the horizontal and vertical directions. It was hot.

As can be seen from the above explanation, in the method for manufacturing a sliding contact of the present invention, the brush wire is not welded to the base material, but the brush wire is held and fixed to the base material by caulking the base material, so stress such as thermal distortion etc. There is no deformation, the brush wire does not lose its springiness, and since the brush wire is held and fixed in the mold by caulking the base material, each brush wire is tilted in the horizontal and vertical directions. It can be attached to the base material straight, parallel and horizontally without any problems, and since the brush wire is not welded, the attached part will not buckle and break. Therefore, there is an excellent effect that a sliding contact of good quality can be obtained.

[Brief explanation of drawings]

1A to 1D are diagrams showing steps of a conventional method for manufacturing a sliding contact, and FIGS. 2A to 2E are diagrams showing steps of a method of manufacturing a sliding contact according to the present invention. 5... Band-shaped base material, 6... Each comb tooth, 6a...
... U-shaped part, 7 ... brush wire, 7a ... semicircular curved part, 8 ... sliding contact.

Claims (1)

[Claims] 1 The tip of the band-shaped base material is punched into a comb-teeth shape, and the front half of each tooth is drawn into a U-shape. Next, a brush wire is fed into the U-shape of each tooth in a mold to create a U-shape. The parts are caulked to hold and fix the brush wire, then the band-shaped base material and the brush wire are cut to the required length, and then the tip of the brush wire is formed to form a semicircular curved part. A method of manufacturing a sliding contact characterized by the following.