JPH04244815A - Manufacture of rubber molded form - Google Patents

Abstract

PURPOSE:To provide the manufacture of a rubber molded form in which no flash is formed in the through-hole of a rubber body. CONSTITUTION:A core 15 having the same shape as a through-hole 14 is inserted into the through-hole 14 of a rubber body 11 arranged into a mold 10, and the front surface of the core 15 is vulcanized and molded under the state in which the front surface is pushed against the internal surface of a metallic plate 12 through a heat-resistant rubber sheet 16. The heat-resistant rubber sheet 16 prevents the flowing of one part of the rubber body 11 into the through- hole 14 on vulcanization molding, thus manufacturing a rubber molded form, in which no flash is formed in the through-hole 14.

Description

[Detailed description of the invention]

[Object of the invention]

0002

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a vibration-proof rubber molded product.

0003

[Prior Art] Conventionally, for example, as shown in FIG.
The anti-vibration rubber 5 is made by abutting metal plates 3 and 4 having introduction holes 3a and 4a concentrically communicating with the through-hole 1 on both sides of a rubber body 2 having a through-hole 1, respectively, using a well-known mold ( (not shown) is manufactured by vulcanization molding. That is, a rubber body 2 and a metal plate 3 to be vulcanized are placed in a predetermined mold.
.

0004

However, in such a manufacturing method, as shown in FIG. 2, a part of the rubber body 2 flows into the through hole 1 along the inner surface of the metal plate 3, causing a burr 2a. will form. This burr 2a is the anti-vibration rubber 5
This causes inconveniences such as making it difficult to attach the bolts 7 for fixing to the board 6 or making them easy to loosen during use. For this reason, after vulcanization molding, the burr 2a is removed using a cutter or the like, but since it is inside the through hole 1, the removal operation requires considerable effort and time.

[0005] The present invention has been made to solve these conventional problems, and an object of the present invention is to provide a method for manufacturing a rubber molded product that prevents the formation of burrs in the through holes of the rubber body. .

[Configuration of the invention]

[0007]

[Means for Solving the Problems] The method for manufacturing a rubber molded product of the present invention includes a rubber body having a through hole in a mold, and a metal plate that comes into contact with the surface of the rubber body where the through hole opens. In the method of manufacturing a rubber molded product, the rubber molding is performed by vulcanization molding, in which a core having the same shape as the through-hole is inserted into the through-hole of the rubber body, and a heat-resistant rubber sheet is covered with a heat-resistant rubber sheet on the tip end of the core. It is characterized in that vulcanization molding is performed while being pressed against the inner surface of the metal plate via the metal plate. .

[0008] The rubber body is a cylindrical body or a prismatic body made of natural rubber, chloroprene rubber, etc., and the heat-resistant rubber sheet is a rubber material having higher heat resistance than the rubber body, such as silicone rubber, fluororubber, ethylene propylene. This is a rubber sheet made of rubber or the like and having the same cross section as the tip end surface of the core.

[0009]

[Operation] According to the method of manufacturing a rubber molded product of the present invention, the heat-resistant rubber sheet interposed between the tip end surface of the core and the inner surface of the metal plate during vulcanization has a part of the rubber body with a through hole. To manufacture rubber molded products with no burrs inside through-holes. After this manufacture, the heat-resistant rubber sheet is removed.

0010

EXAMPLES The method for manufacturing a rubber molded article according to the present invention will be explained below with reference to illustrated examples. FIG. 1 is a diagram showing one embodiment of the present invention, and shows a case where a rubber molded product having substantially the same structure as the vibration-proof rubber shown in FIG. 2 is manufactured.

In the present invention, the following preparations are made before manufacturing the rubber molded product. In FIG. 1, a rubber body 11 in the state of raw rubber and metal plates 12 and 13H that are in contact with both surfaces of the rubber body 11 are placed in a mold 10 having a predetermined cavity. The through hole 14 of the rubber body 11 and the introduction holes 12a, 13a of the metal plates 12, 13 are concentrically communicated with each other. Introduction hole 13a in the metal plate and through hole 14 in the rubber body
Insert the core 15 into the hole. The core 15 has the same shape as the cavity in the introduction hole 13a and the through hole 14, and is configured separately or integrally with the mold 10. The front end surface of the core 15 is pressed against the inner surface of the metal plate 12 via the heat-resistant rubber sheet 16.

The heat-resistant rubber sheet 16 is made of, for example, silicone rubber and has the same cross section as the tip end surface of the core 15.
It is attached to the inner surface of 2.

Predetermined vulcanization molding is performed in such a state, and the heat-resistant rubber sheet 16 prevents a part of the rubber body 11 from flowing into the through hole 14 during vulcanization, and also has a cushioning effect. This also prevents the inner surface of the metal plate 12 from being damaged when the core 15 is attached.

After the rubber molded product is vulcanized and molded, the mold 10 is released and the heat-resistant rubber sheet 16 is removed.

It should be noted that the rubber molded product produced by the method of the present invention is limited to the structure shown in the drawings, as long as it is made by adhering a metal plate to the opening surface of the through hole of a rubber body having a through hole. It's not a thing.

[0016]

As explained above, according to the manufacturing method of the present invention, a core having the same shape as the through-hole is inserted into the through-hole of the rubber body, and the tip end surface of the core is covered with a heat-resistant rubber sheet. By vulcanizing and molding the rubber body while being pressed against the inner surface of the metal plate through the rubber body, part of the rubber body is prevented from flowing into the through hole during vulcanization. Therefore, it is possible to manufacture a rubber molded product without burrs in the through holes of the rubber body.

[Brief explanation of the drawing]

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

FIG. 2 is an explanatory diagram of a conventional method for manufacturing a rubber molded product.

[Explanation of symbols]

10...Mold 11...Rubber body 12, 13...metal plate 14……Through hole 15……Nakako 16……Heat-resistant rubber sheet

Claims (1)

[Claims] Claim 1: A rubber body having a through hole in a mold;
In this method of manufacturing a rubber molded product, in which a metal plate is placed in contact with the surface of the rubber body where the through hole opens, and vulcanization molding is performed, a core having the same shape as the through hole is placed in the through hole of the rubber body. A method for manufacturing a rubber molded product, comprising inserting a core into the metal plate, and vulcanizing the metal plate while pressing the tip end surface of the core against the inner surface of the metal plate through a heat-resistant rubber sheet.