JPH03258418A - Manufacturing device for coned disc spring - Google Patents

Abstract

PURPOSE:To allow the improvement of the workability by utilizing the metallic die as the die and the elastic body of wear resistance as the punch. CONSTITUTION:The metallic foil is inserted between the die B and the punch A, compressed, and the wave mark carved on the pressing surface of the die B is formed to the metallic foil and the coned disc spring is manufactured. Then, the metallic die is utilized as the die B, and the elastic body of wear resistance is utilized as the punch A. The elastic body of wear resistance is made of urethane rubber. Therefore, the requirement to correct both the dies of male and female can be made needless.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an apparatus for manufacturing a disc spring in which ripples are formed outward from the center.

[Conventional technology and its problems]

In Japanese Patent Application No. 1-12879, etc., the present inventors created a wavy cross-section exhibiting spiral ripples P from arbitrary points around the center circle 100 of the stainless steel foil, as shown in FIG. The ripples P are proposed as dishbones D that are inclined toward the central circle 10. This disk spring D is manufactured by manufacturing a mold based on each specification (shape) such as the curvature of the ripples, and is press-formed and punched using this mold. The mold is usually
Manufactured by electrical discharge machining.

To manufacture the mold, first, for example, 3 around the center circle 10.
Assuming that the process starts from an equal division, a jig Q is manufactured in which a spiral groove 12 is cut into the surface of a truncated cone body 11 shown in FIG. 5. In this jig and tool Q, as shown by the chain line in the same figure,
is wound along the groove 12 to produce an electrode. The shape of the jig Q and its groove 12 is a filament! Manufactured with consideration to the spring properties of.

Since the spiral filament l removed from the jig Q has a high height (it is bowl-shaped), press it down to the desired height. Next, as shown in FIG. 6, the spiral filament obtained as described above! Three pieces are combined and brazed to the central post 13, and a rod 14 for attaching the electrode is set upright on the post 13 (see Fig. 7).

The electrode S thus obtained is mounted on an electric discharge machine as shown in FIG. 7, and a mold W is manufactured. The mold W requires a male mold and a female mold, but by forming two molds W obtained by the above electric discharge machining and performing the electric discharge machining using one of them as an electrode, the processed product and Using the remaining molds W, both male and female molds are obtained.

Incidentally, each of the series of inventions related to disc spring D was useful and received great admiration from many quarters. For this reason, the inventor continues to conduct research in order to respond to this interest, but in the process, the following problems have arisen that need to be solved.

(1) As mentioned above (both male and female molds are manufactured, one is used as a die and the other as a punch during press molding, but between them there is a metal foil (stainless steel foil) made of disc spring material. Because of this intervention, the curvature etc. of the ripples that fit into each other are slightly different, and it can only be put to practical use after correction (correction) is added.This correction work is extremely troublesome. be.

(2) During press molding, the spiral ripples P shown in Fig. 4 etc.
When the ratio of the slope height h to the radial length l (h/f), that is, the degree of slope, increases, the molding pressure differs greatly between the outward slope and the inward slope of the ripple, and the die and If both punches are metal, the pressure difference will not be absorbed, and there is a risk that the metal foil will break. This damage is
Conventionally, this occurs when the degree of inclination (h#) is around 175 or more, and for this reason, it is performed at a slope of 1/6 or less.

However, this degree of inclination greatly affects the deflection of the disc spring D. For example, when used in a diaphragm, the deflection becomes a displacement, and the larger the displacement, the more advantageous it is in terms of accuracy and detection range.

The present invention aims to solve this problem.

[Means to solve the problem]

In order to solve the above problems, in the present invention, a metal foil is interposed between a die and a punch and compressed, and ripples engraved on the pressure contact surface of the die are formed on the metal foil to manufacture a disc spring. In the above-mentioned apparatus, a metal mold is used for the die, and a wear-resistant elastic material is used for the punch.

Urethane rubber or the like can be used as the wear-resistant elastic body.

[Function] In the disc spring manufacturing apparatus according to the present invention configured as described above, when the punch is pressed with a metal foil interposed between the die and the punch, the pressing surface of the punch contacts the pressing surface of the die. The metal foil deforms along with the shape of the metal foil, and along with the deformation, the metal foil also deforms and ripples are formed.

[Example] As shown in Fig. 1, punch A and die B are
Press forming is performed between die B and punch A by fitting punch A into die B via support H and pressing down.

In the center of the die B, there is a die insert (molding mold) 1 shown in Fig. 3.
is fitted. This die insert 1 is made of mold steel, has a drill hole 2 formed in the center, and has ripples P' in the shape of a disc spring D, which will be described later, engraved around the drill hole 2. This die insert 1 is manufactured in the same manner as the mold described above.

A punch insert 3 shown in FIG. 2 is also fitted in the center of the punch B. This punch insert 3 is made of urethane rubber,
Similarly, a drill hole 4 is formed in the center, but after maintaining a slightly flat surface, a concave curved surface 5 without ripples P' is formed around it.
It consists of The plane portion corresponds to the central circle 10.

The hardness of urethane rubber is 50 to 95 on the HsA scale.
shall be. If it is less than 50, sufficient pressing force will not be obtained during press molding, and the metal foil will not be able to obtain the desired shape, especially the ripples P. On the other hand, if it exceeds 95, there is a risk that the metal foil will be damaged.

In this example, when the disc spring D shown in FIG. 4 was press-formed, the die insert 1 and punch insert 3 did not become flat until about 100 pieces were used, and the disc spring D in the desired shape could be obtained. did it. In addition, in FIG. 4, the radius of curvature R: 1
00mm, diameter S of center circle 10: 10mm, radius of curvature r of peaks and valleys of ripple P = 0.511m, ripple height t = 0.
The height of the ripples was 2.7 ms, the radial length of the ripples was 15.5 mm, the material was stainless steel foil with a thickness of 0.015 mm, and the finished outer diameter was 54 mm.

〔Effect of the invention〕

The present invention is constructed as described above and is pressed by a wear-resistant elastic body, so that the elastic body deforms along the engraved ripples of the mold, so that the male and female pieces can be There is no need to correct the mold, improving work efficiency.

In addition, since the pressure difference between the outward slope and the inward slope in the ripples is also absorbed by the elastic body, the degree of inclination (h/A') can be increased, and therefore a disc spring with a large displacement can be obtained smoothly. .

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view of an embodiment of the manufacturing apparatus according to the present invention, FIGS. 4) is a partially cutaway front view and a plan view of the same Goi insert, Figure 4 (ta+) and (BL are a perspective view and a cutaway front view of the disc spring, and Figures 5 to 7 are explanatory views of mold manufacturing. .A...Punch, B...Gui,
D...disc spring, H...post, P
... Ripple, W ... Mold, 1.
...Gui insert (molding mold), 2.4...Drill hole, 3...Punch insert.

Claims (2)

[Claims] (1) In an apparatus for manufacturing a disc spring by interposing a metal foil between a die and a punch and compressing the metal foil, and forming ripples engraved on the pressure contact surface of the die into the metal foil, using a metal mold for the die, A disc spring manufacturing apparatus characterized in that the punch is made of a wear-resistant elastic material. (2) The apparatus for manufacturing a disc spring according to claim (1), wherein the wear-resistant elastic body is made of urethane rubber.