JPS6039802A - Method of forming slider - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Eleven Akira Kozu describes a method for forming a slider, particularly a method for forming a slider having a large number of relatively small slider pieces.

Conventionally, when forming a slider piece of a slider that comes into sliding contact with a resistor of a variable resistor, generally the 11th Δ(A), (B)
As shown in Fig. 1, the processing method is shown in Fig. 1. First, a single elastic metal plate 4 of various ratios is placed with a stamping die having a recess 2 on the upper surface, and then a plate of blood is placed on top of the stamping die. Press the first piece from above with the stamping punch 3 to punch out the section 4a of the metal plate 4, and then
219i (A), (B) K - All remaining branched 1. Tip of the vine thread piece ☆: 1.1 part ζ, stamping die 5 with a recess 5a and a protrusion 6 corresponding to the i+iJ marking 4 part 5a
A contact protrusion 7 is formed by protrusion processing with a stamping punch 6 having a diameter 5, M number of slider pieces 8 of the slider are formed,
ing.

21LJ according to method 1 above, to avoid creating a burr on the lower surface of the HIb piece 8 when punching out the section 4a of the metal plate 4,
Slide the slider piece 8 with the resistor 9 on the insulating substrate 10 (Fig. 3 #
In order to achieve smooth sliding contact, the hemispherical contact protrusion 7 must be formed at the tip of the slider piece 8 as described above. Reduce the width of slider piece 8
(Slim) i', or K, has a processing limit. Furthermore, since there is a limit to reducing the dimensions of the recess 2 of the stamping die 1 and the stamping punch 3 for punching out the section 4a,
Forming a slider with a minute (X? mover piece 8) was a fastening.

The present invention solves the above-mentioned drawbacks and will be explained in detail below with reference to the drawings.

In FIG. 4, reference numeral 11 denotes a stamping die of a mold used for press working, and on the upper surface of the stamping die 11, several approximately (pear-shaped) protrusions 11a of the same size are formed in series in the longitudinal direction. The protrusion 11a has an opposite slope 11bf:'lHq,
An arcuate valley portion 11c is formed between each of the protrusions 11a and lla. Note that the tip portion lid of the protrusion 11a is formed flat. Reference numeral 12 designates an engraving punch which, like the engraving die 11, has a substantially wedge-shaped protrusion 12a having an opposing slope 12b and an arcuate valley '8B12c. 2) on the flat shoulder.

Between the stamping die 11 and the stamping punch 12 that constitute a pair of molds, a relatively thin hoop-shaped gold plate 4 having elasticity is placed on the stamping die 11. Then, pressurize it with the stamping punch 12 placed above. Note that both ends 11e and L2 of the stamping die 11 and the stamping punch 12
e is formed at an acute angle, and when suppressed, the tips thereof are arranged so as to be in contact with each other, and the first tip portion 11d,
Since 12d is formed flat, even when pressed, it will not have four corners 13, and in this embodiment, this interval 13 is set to 0.03 mm or less. ing. However, the length i is not limited to this value, and furthermore, the end portions 11e and 12e are the tip portions 11d and 12d.
It may have a similar shape.

As mentioned above, the metal plate 4 is stamped with the stamping die 11 and the stamping punch 12.
As shown in the enlarged cross-sectional view of the main part in FIG. (In other words, the flat tip portion 11d of the stamping die 11 and the stamping punch 12
, the spacing 13 between 12a is less than 03mm, Q”,
In the state in which the metal plate 4 is pressed until the tA portions 11e and 12e are in contact with each other), the upper and lower flat surfaces of the metal plate 4 are at the tip portion 11d.

12d bites in (hidden, and along the opposing slopes 11b and 12b of both protrusions 11a and 12a,
Plastically deformed into hemispherical shapes in the directions of the arcuate valleys 11c and 12c, the final result is a plurality of cylindrical deformed parts connected to each other by minute intervals 13 as shown in FIG. 14
. . . and a flat portion 15 . . . are formed.

At this time, as shown in Figure 7, a hoop-shaped metal plate 4
A plurality of deformed parts 14 and flat parts 15 form a slider piece 16, a holding part 17, and a continuous base part 18 which will be cut later.

After this, as mentioned above, the stamping punch 12 and the stamping die II
The distal end portion 19 of the cylindrical deformation m14 formed by K and the flat portion 15 is bent into a substantially dogleg shape as shown in FIG.

Then, the tip portion 19 is bent and the fl/ζl/ζ sliders are all 20-inched. As mentioned above, this etching process is performed because the thickness of the flat part 15 connecting the deformed part 14 is set to 0.3 mm or less in this embodiment.
．． 03mm or more/31r.

By this etching process, the deformed portion 14 is separated into one cylindrical slider piece 21 shown by the broken line in the diagram λ6.

This separated slider piece 21, holding part 17, etc.
After this, a surface treatment process such as silver metal coating is performed.

The first continuous hoop-shaped slider piece 21 thus formed is separated by a press along line A--A in FIG.

Finally, a large number of slider pieces 21 having a cylindrical (wire-like) cross section as shown in FIG. 9 are obtained. [; This is a block diagram of the processing process of Ming.

As shown above, the present invention includes a plurality of continuous substantially wedge-shaped protrusions 11a, 12a and an arcuate valley portion 11c.

12c, a forming tool 11. ．． by 12, 7
- Press the elastic metal plate 4 into a shape to form a plurality of cylindrical deformed parts 14 and flat parts 15 on the metal plate 4, and then quantify Br to a level of TX1 to 150 or more. are removed by etching and each of the s1 deformed portions 14 is separated,
4J number of slider pieces 21 are formed, and then a metal plate 4 is formed.
Since one slider is obtained by cutting from the root portion 18, the cross-sectional shape of each slider piece 21 is wire-like, and there is no occurrence of a frilled surface as in the conventional case. In addition, since the hoop-shaped metal plate can be processed continuously, it is easy to process, and is the first in terms of mass productivity. In addition, the molding tool also has flat tip portions 11d and 12d and an arcuate valley portion 11c,
Since the 12c is M-shaped, it is easy to process, and there are fewer corners, so the life is longer than the 1ζ, and maintenance is easy.

Then, when the slider formed in this way slides over the resistor formed on the insulating substrate, the -
Even if insulating fine particles are present in 116, the other slider pieces are always in contact with the resistor, so it is practical to prevent the generation of sliding noise and poor contact. It has a remarkable effect. ′

[Brief explanation of drawings]

1(A), 2(B) and 2(A), 2(B) show a conventional method of forming a slider, and FIG. 1(A). (B) is a cross-sectional side view of the main part, FIG. 4 to 10 relate to an embodiment of the present invention, and FIG. 4 shows a method of forming the slider. 5 is an enlarged sectional side view of the main part of FIG. 4, FIG. 6 is a front view of the slider piece processed with pre-7, and FIG. 7 is a plan view of the same.
FIG. 8 is a side view of the same, FIG. 9 is a side view of a main part illustrating the state of contact between the resistor and the slider, and FIG. 10 is a diagram illustrating the forming process. 11.12...Forming tool, llc, 12c...
...Trough, lid, 12d...Tip, 1
4... Deformed part, 15... Flat part. Figure 1 (A) (B) Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 9vA 1101m

Claims (1)

[Claims] A piece of elastic metal material is pressed by a molding tool having a plurality of continuous arcuate valleys and a flat tip, and a substantially cylindrical deformed part and a flat part are formed in the elastic metal/stone material. and form 1
J. A method for forming a near mover, characterized in that the deformed part is divided into 11 by gluing the goto deformed part and the flat part, and five slider pieces are provided.