JPH0326521B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Technical Field of the Invention The present invention relates to a slider used in electrical components such as variable resistors and switches, and particularly to a method for manufacturing a slider having a large number of strips.

(b) Prior art and its problems Conventionally, methods for manufacturing sliders with a large number of strips used in variable resistors, etc.
As disclosed in No. 125292, first, a predetermined portion of a flat metal plate is cut into a large number of strips using a punch 1 and a die 2 as shown in FIG. 8, and at the same time the width of the strips is compressed and reduced. As shown in FIG. 9, the strip cut in the first step is moved vertically by a punch 3 and die 4, and as shown in FIG. The strips moved in the process are reversely moved up and down by the next punch 5 and die 6 to remove burrs and completely cut the adjacent strips, as shown in Figure 11. This consists of a fourth step of returning the third official strip to a coplanar position using a punch 7 and a die 8 and making it independent.

However, the conventional method has a short lifespan because the cutting edges 1a..., 2a... of the punch 1 and die 2 in the first step are sharp, and in the second and third steps, the strips are doubled or This resulted in triple cutting, which had disadvantages such as not being effective in removing burrs but instead causing burrs to occur.

(c) Purpose of the Invention The present invention has been made in order to eliminate the above-mentioned conventional drawbacks, and it has a long press die life, prevents the generation of burrs due to cutting of strips, and provides an optimal contact shape. It is an object of the present invention to provide a method for manufacturing a slider having a large number of strips that undergo little change over time and in which adjacent strips are independent of each other while suppressing variations in shape.

(d) Structure of the Invention In order to achieve this object, the present invention includes a first pressing step for separating a predetermined portion of a thin metal plate into a large number of strips, and a method for separating the strips separated in the first step. It consists of a second pressing step for organizing the strips on the same plane, and a third pressing step for forming recesses in the strips, and the third pressing step includes the use of a punch having a right-angled blade and this punch. and a die having a curved portion corresponding to the blade portion of the punch, and a distance between the blade portion and the curved portion at the bottom dead center of the punch is approximately the same as the thickness of the thin metal plate. It is characterized by

(e) Embodiments of the Invention Next, a method for manufacturing a slider having a large number of strips according to the present invention will be described in detail using embodiments shown in FIGS. 1 to 7. Figures 1 to 3 are cross-sectional front views showing the shapes of the punch and die edges, and Figures 4 to 3 are cross-sectional views showing the shapes of the punch and die edges.
FIG. 6 is a sectional front view of a slider pressed by the punch and die shown in FIGS. 1 to 3, and FIG. 7 is a perspective view of the slider manufactured by each of the steps described above. .

In the figure, reference numeral 10 denotes a punch used in the first step, and although only one blade portion 10a is shown in this embodiment, in reality, the number of punches 10 is equal to the number of strips 16a. 11 is a die corresponding to the punch 10. In order to extend the life of the blade parts 10a, 11a, a gap is provided between the punch 10 and the die 11 so that the blade parts 10a, 11a do not mesh with each other due to the shaft height dimension of the mold. This gap prevents the strip 16a from biting into the punch 10 and die 11 during cutting in the first step. 12 is a punch used in the second step, and 13 is a die corresponding to the punch 12, both of which have a flat plate shape. In addition, in the second step, the returning step, the strip 16a is compressed and rolled in a direction perpendicular to the longitudinal direction of the strip 16a, so that adjacent independent strips 1
As shown in the figure, the punch 12 and the die 13 are provided with a clearance equal to the thickness of the flat metal plate at the shaft height dimension of the mold, as shown in the figure, in order to prevent crimping or misalignment of the two parts 6a. Reference numeral 14 denotes a punch used in the third step, and the punch 14 is provided with a number of right-angled blade portions 14a corresponding to the number of strips 16a. A die 15 corresponds to the punch 14, and the die 15 is provided with a number of curved portions 15a corresponding to the number of blade portions 14a. In addition, the punch 14 at the time of mold shaft height
The gap between the blade portion 14a and the curved portion 15a of the die 15 is made the same as the thickness of the thin metal plate. This not only prevents the strip from being rolled, but also extends the life of the punch 14 and die 15.

The punches 10, 12, and 14 are installed in the same upper die (not shown), and the die 1
1, 13, and 15 are attached to the same lower mold (not shown), and the above-mentioned steps are sequentially performed by lowering the upper mold.

Next, a method of manufacturing a slider using the punch and die will be described. First, a long metal thin plate is placed between an upper mold and a lower mold, and when the upper mold is lowered, a part of the metal thin plate is cut into strips by the punch 10 and die 11 as shown in FIG. 16a, 16
b, 16c, the middle strip 16b
is located below the strips 16a, 16c on both sides. Next, the upper mold is raised, and the cut portion of the thin metal plate 16a (not shown) is automatically positioned between the punch 12 and die 13 in the next second step, and the upper mold As the strips 16a... are lowered, they are sandwiched between the punch 12 and the die 13, and are returned to the same plane as shown in FIG. Then, the strip 16 was returned again by raising the upper die.
a... is located between the punch 14 and the die 15 in the third step, and as the upper mold descends, each strip 16a...
Therefore, if a rectangular piece is bent without rolling, the strips 16a will shrink in the direction perpendicular to the longitudinal direction, as shown in FIG. 6, and a gap 17 will be created between adjacent strips 16a. It is something that can be done and has independence. Also, by bending, one side of the strip is rounded, giving it an optimal shape as a contact point for the slider.

By performing each of the above steps, a slider 16 as shown in FIG. 7 can be manufactured.

(f) Effects of the Invention As described above, the present invention includes a first pressing process in which a predetermined portion of a thin metal plate is separated into a large number of strips 16a, 16b, and 16c; a second pressing step in which the materials are arranged on the same plane;
Since a slider with a large number of strips is manufactured by the third pressing step of forming recesses in the strips, there is no need to sharpen the cutting edges of the punch and die as in the conventional method. Since heavy and triple cuts can be avoided, the life of the mold is long and a high-performance slider without burr generation can be provided. Further, the third pressing step includes a punch having a right-angled blade portion and a curved portion corresponding to the blade portion of the punch, and a gap between the blade portion and the curved portion at the bottom dead center of the punch. This is done using a die that has approximately the same thickness as the thin metal plate, so the shape of the contact part of the slider is determined by the shape of the curved part of the die, so the contact surface (lower surface) of the slider is It is easy to create the perfect shape for the highly accurate rounded slider contact, and since the upper surface of the slider has a moderate V-shaped bend in cross section, it is easy to use after processing or during use. The optimum shape of the slider as a contact point will not be deformed, and since the strips are bent without being pressed together by the punch and die, gaps will be created between adjacent strips, making them independent. It is possible to reliably obtain a slider having a large number of strips with a high degree of elasticity.

[Brief explanation of the drawing]

1 to 7 show an embodiment of the present invention, FIG. 1 is a sectional front view showing the shape of the punch and die at the time of mold shutter height in the first step, and FIG. 2 is a sectional front view of the same in the second step. , Figure 3 is the same sectional front view of the third process, Figure 4 is the sectional front view of the strip in the first process, and Figure 5 is the same sectional front view of the strip in the first process.
The figure is a cross-sectional view of the strip in the second step, and Figure 6 is the third step.
FIG. 7 is a perspective view of a slider made according to the present invention, FIGS. 8 to 11 show conventional examples, and FIG. 8 is a cross-sectional view of a strip of process. A cross-sectional front view showing the punch shape in the first step,
Figure 9 is the same cross-sectional front view of the second process, and Figure 10 is the third process.
FIG. 11 is a sectional front view of the fourth step. 10,12,14...Ponchi, 11,13,1
5... Die, 10a, 11a, 14a... Blade part,
15a...Curved portion, 16...Slider, 16a...
Strips.

Claims (1)

[Claims] 1. A first pressing step in which a predetermined portion of a thin metal plate is separated into a large number of strips, a second pressing step in which the strips separated in the first step are arranged on the same plane, and the strips are separated into a large number of strips. a third pressing step for forming a recess in the piece, and the third pressing step includes a punch having a right-angled blade portion, a curved portion corresponding to the blade portion of the punch, and A slider equipped with a large number of strips, characterized in that the distance between the blade part and the curved part at the bottom dead center is achieved by a die whose thickness is approximately the same as the thickness of the thin metal plate. Production method.