JPH07239037A - Rubber molding - Google Patents

Abstract

PURPOSE:To prevent rubber moldings from adhering to one another, to simplify fabrication processes for dies necessitated by this additional function so as to prevent cost increase, and to enhance the functions of products and the efficiency of assembly by providing anti-stick projections on the surface of each rubber molding. CONSTITUTION:Rubber moldings S are each made of a disc having a center hole 1 and provided with anti-stick projections 3 on its surface 2. Two of the anti-stick projections 3 are provided on one side 4 and the remaining two are provided on the other side 5. The projections 3 each have a triangular cross section and are arranged to form a ring. The rubber moldings S are each in the form of spool packing with sealing inner 2a and outer 2b peripheral surfaces. The projections 3 are provided on nonsealing surfaces 4, 5. Therefore, even when stacked the rubber moldings S do not adhere to one another because of the anti-stick projections 3, and can easily be separated from one another.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a rubber molded article.

[0002]

2. Description of the Related Art Rubber moldings such as O-rings are manufactured in a manufacturing process (press molding process, finishing process, secondary vulcanization process, inspection process, packaging process, etc.) As shown in FIG. 8, there was a case where the rubber molded products a, a were stuck together (that is, they were in close contact with each other).

Therefore, conventionally, as a method of preventing sticking, a method of applying an anti-adhesive agent (mainly liquid) or powder to a rubber molded product (product) or a method of roughening the surface of the rubber molded product Etc. were adopted.

[0004]

However, the method of applying the anti-adhesion agent has the drawbacks that the product is soiled, the appearance inspection is difficult, dust and the like are easily attached, and the handling is difficult.

A method of applying powder to a product is also
This was troublesome because the product was contaminated, and the powder became a foreign substance, and it was necessary to reclean the product when it was assembled.

Further, in the method of roughening the surface of the product,
Certainly, the surface becomes rough and the sticking of the products is effectively prevented. However, in order to finish the surface of the product rough, it was necessary to finish the mold surface rough. Therefore, in the mold manufacturing process, the sharp edge of the mold disappears by shot blasting for roughening (so-called pear surface).
There is a drawback that the machining process becomes complicated and the die machining cost becomes high. That is, it is necessary to process the opening end edge of the recess for the molded product into a sharp edge, but this opening end edge does not become a sharp edge due to shot blasting, and the secondary processing
It was necessary to scrape the die surface until it had a sharp edge.

If the rubber molded product is an O-ring or the like,
It is difficult to treat only the non-sealed surface part with pear,
The entire rubber molded product is treated with pear. That is, the sealing surface portion was also made into a satin finish, which reduced the sealing property.

[0008] Therefore, an object of the present invention is to provide a rubber molded product which does not stick to each other and which can easily manufacture a mold used at the time of manufacturing at low cost.

[0009]

In order to achieve the above-mentioned object, the rubber molded article according to the present invention is provided with a sticking preventing ridge on the surface.

Further, another rubber molded article according to the present invention is one in which a sticking preventing ridge is provided on the non-sealing surface portion of the surface.

[0011]

[Function] Since a sticking prevention ridge is provided on the surface,
They do not adhere to each other and sticking is prevented.

Further, in the case where the sticking-preventing ridges are provided on the non-sealing surface portion, the sticking-preventing ridges do not affect the sealing property of the rubber molded product, and further, the sticking of the molded products is prevented. It

If a small groove for a ridge is formed in the product groove of the mold, a ridge for preventing sticking can be formed, and the mold can be easily manufactured.

[0014]

The present invention will be described in detail below with reference to the drawings illustrating the embodiments.

1 and 2 show a rubber molded product according to the present invention. This rubber molded product S is composed of a disk body having a center hole 1, and a surface 2 is provided with sticking preventing ridges 3 ... There is.

That is, the sticking preventing ridges 3 are provided on each of the one surface 4 and the other surface 5, two by two. In addition, the sticking preventing protrusion 3 has a triangular cross section,
As shown in FIG. 2, they are arranged in a ring shape. The rubber molded product S has a so-called spool packing shape, and the inner peripheral surface 2a and the outer peripheral surface 2b thereof are sealing surface portions. Therefore, in this case, the protrusion 3 is provided on the non-sealing surface portion.

By the way, as the height dimension H of the protrusion 3,
For example, it can be set to about 0.01 mm to a range that does not affect the function of this product (rubber molded product).

Therefore, according to the rubber molded product S constructed as described above, even when the rubber molded products are stacked as shown in FIG. Without, that is, without sticking, the rubber molded product can be easily separated. Further, in FIG. 4A, the rubber moldings are overlapped with each other in the state where the axial centers O are aligned with each other.
As shown in (b) of (2), even when the axis O is overlapped in a deviated state, the rubber molded product S does not come into close contact with the sticking preventing ridge 3 and does not stick to each other.

However, the sticking preventing protrusion 3 is shown in FIG.
Although the rubber molded product shown in FIG. 2 has a triangular cross section, it may have the shape shown in FIG.

That is, the sticking-preventing ridge 3 has a semicircular cross-sectional shape in FIG. 3 (a), and a semi-elliptical cross-sectional shape in FIG. 3 (b). Is square or rectangular, and the cross-sectional shape is trapezoidal in FIG. The sticking-preventing ridge 3 is not limited to the shape shown in the figure, and may be any one that can prevent sticking between products as long as it does not affect the functions of the products.

Further, the number of the protrusions 3 may be one on each of the one surface 4 and the other surface 5 or may be a plurality of three or more. Of course, the number of protrusions may be different between the one surface 4 and the other surface 5. Further, the width of each protrusion 3 may be any as long as it does not affect the functions of the products and can prevent the products from sticking to each other.

Next, FIG. 5 shows another embodiment. In this case, the rubber molded product S is an O-ring, which is fitted in the concave circumferential groove 7 of the shaft 6 as shown in the drawing. That is, in this case, it is a so-called piston type, and the inner diameter side and the outer diameter side are the sealing surface portions, and the non-sealing surface portions, that is, the surfaces corresponding to the side surfaces 7a, 7a of the concave circumferential groove 7 are prevented from sticking to each other. Are provided respectively. Reference numeral 8 is a cylindrical body through which the shaft 6 is inserted.

Therefore, in this case as well, similar to the rubber molded product shown in FIGS. 1 and 2, the ridge 3 is provided at a position avoiding the sealing surface portion and does not affect the sealing property of this rubber molded product.

FIG. 6 shows another embodiment. In this case as well, the rubber molded product S is an O-ring, but a sticking preventing projection 3 is provided on the sealing surface portion. That is, it is a so-called flange type and is fitted in the concave circumferential groove 10 of the first member 9, and in this case, the protrusion 3 is provided on the bottom surface 12 side and the second member 11 side of the concave circumferential groove 10.

By the way, in this case, since most of them are for fixing, even if the ridges 3 are provided on the sealing surface portion, they hardly affect the sealing property, and rather, the sealing is caused by the local concentration of the sealing surface pressure. The property is improved.

Next, FIG. 7 shows still another embodiment. In this case, the rubber molded product S is not a so-called donut-shaped product but a disc-shaped product. That is, this rubber molded product S is
The disk-shaped main body 13 and the truncated cone portion 14 continuously provided on the upper surface of the main body 13 are provided with annular sticking-preventing ridges 3 on the upper and lower surfaces 15 and 16.

Therefore, also in this case, as shown in the drawing, even if the rubber molded products S, S overlap each other, the rubber molded products S, S do not adhere to each other at the ridges 3, that is, they do not stick to each other. It can be easily separated. The sealing surface portion in this case is inside the protrusion 3 on the upper surface 15 and inside the protrusion 3 on the lower surface 16, and the protrusion 3 is provided on the non-sealing surface portion.

Further, in each of the embodiments shown in FIGS. 5, 6 and 7, the sticking preventing protrusion 3 may be formed in the shape shown in FIG. 3 or the like, and the number of protrusions 3 may be freely changed. can do.

However, if a large number of ridges 3 are provided, the surface on which the ridges 3 are provided becomes a rough surface in this large number of ridges 3, and in this case as well, sticking can be prevented. .

It is possible to prevent sticking by providing independent small protrusions on the surface 2, but it is troublesome to form these independent small protrusions. That is, in the die manufacturing, it is necessary to separately process the small recess for forming the small protrusion after processing the product groove, which is troublesome and costly.

On the other hand, if the ridges 3 are formed as in the present invention, the ridges 3 are formed by the same method as the product groove processing.
A small groove for forming can be formed, and the die production is extremely easy.

The rubber molded product of the present invention can be applied not only to sealing materials such as O-rings and disk-shaped products but also to rubber molded products of any shape in which sticking is a problem.

[0033]

Since the present invention is configured as described above, it has the following effects.

In the manufacturing process and the assembling process after the die molding, the rubber molded products S, S are unlikely to stick to each other,
Easy to handle.

Since it is not necessary to apply an anti-adhesive agent, powder or the like, it is easy to handle, does not stain the product, and does not require rewashing or the like.

As a mold for manufacturing the rubber molded product S, a small groove for forming the sticking-preventing ridge 3 may be formed on a conventional mold, which facilitates mold manufacturing and increases cost. I won't.

In the case where the sticking-preventing ridge 3 is provided on the non-sealing surface portion, the sticking-preventing ridge 3 does not affect the sealing property of the rubber molded product S, and the sealing performance does not deteriorate.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a plan view.

FIG. 3 is an enlarged cross-sectional view of a modified example of the sticking preventing ridge.

FIG. 4 is an operation explanatory view.

FIG. 5 is an enlarged sectional view of an essential part showing another embodiment.

FIG. 6 is an enlarged cross-sectional view of an essential part showing another embodiment.

FIG. 7 is a sectional view showing still another embodiment.

FIG. 8 is a cross-sectional view showing a conventional defect.

[Explanation of symbols]

 2 Surface 3 Stick to prevent sticking

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takemi Kakimoto 663 Minoshima, Arita-shi, Wakayama Mitsubishi Cable Industries, Ltd. inside the Minoshima Works (72) Inventor Takashi Miyai 663 Minoshima, Arita-shi, Wakayama Mitsubishi Electric Industrial Co., Ltd. Minoshima Works

Claims (2)

[Claims] 1. A rubber molded article, characterized in that a sticking preventing ridge is provided on the surface thereof. 2. A rubber molded article, characterized in that a sticking preventing ridge is provided on a non-sealing surface portion of the surface.