JPH06106551A - Method for vulcanization bonding of rubber to metal fittings - Google Patents

Abstract

PURPOSE:To obtain a method for vulcanization bonding of rubber to metal fittings by making the rubber extend quickly in a cavity and allowing air not to remain by a method wherein a metal mold is set so that a plurality of casting holes lie midway between a plurality of split faces wherein each end face of at least two split metal molds comes in contact with each other, and rubber is injected therein. CONSTITUTION:Metal fittings 5, 6 formed peripherally with an upper metal mold 1, a lower metal mold 2, and a split metal mold 3 provided by being pinched between side peripheral faces thereof are set. The split metal mold 3 is divided into three parts, and a split face 3A exists at three positions. An injection hole 7 formed on the upper metal mold 1 is provided by three holes corresponding to the split faces 3A. The upper metal mold 1 or the split metal mold 3 is set so that the injection hole 7 lies midway between the split faces 3A. The metal fitting 5 being a hub is placed on the lower metal mold 2. Then, the split metal mold 3 is placed outside an upper side circumferential face of the lower metal mold 2. The annular metal fitting 6 is placed on a stage part of the split metal mold 3, and the upper metal mold 1 is placed so that the injection hole 7 lies midway between the split faces 3A. Rubber injected from the injection hole 7 is branched left and right to fill a cavity.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is a metal fitting suitable for application to those manufactured by vulcanizing and bonding rubber to a metal fitting such as a torsional damper for reducing torsional vibration of a crankshaft, propeller shaft, etc. The present invention relates to a method of vulcanizing and adhering rubber.

[0002]

2. Description of the Related Art Conventionally, in the case of manufacturing a torsional damper, for example, as shown in FIG. 2, an upper mold 1, a lower mold 2, and upper and lower molds 1 and 2 are attached to side peripheral surfaces of the upper and lower molds 1 and 2. The metal fittings 5 and 6 are set in the cavity 4, which is formed in a circumferential shape, in this case, a circumferential shape, which is formed by being sandwiched between the two, and the rubber is injected from the injection hole 7 formed in the upper mold 1. I was injecting. The metal fitting 5 is a hub fixed to a crankshaft or the like, and the metal fitting 6 is an annular inertial mass body, which are joined by rubber to form a torsional damper. The torsional damper, in which the hub (metal fitting 5) and the inertial mass body (metal fitting 6) are joined with rubber, has a relatively large outer diameter and a relatively large amount of rubber even if the thickness of the rubber portion is thin. If it is slow, the vulcanization reaction proceeds, and defects such as insufficient rubber are likely to occur. Therefore, FIG.
As shown in (4), a large number (12) of injection holes 7 were provided to shorten the rubber injection time. The split mold 3 was divided into two parts, and the split surface 3A was at two places.

[0003]

The conventional injection hole 7 has 12 holes.
In the case where the rubber is provided, since the air in the cavity 4 does not easily escape at the time of injecting the rubber, the injected rubber is difficult to quickly spread into the cavity 4, and the vulcanization is promoted and the defective rate does not decrease. Further, there is a drawback that air remains in the rubber and the manufactured rubber is easily damaged.

[0004] Therefore, an object of the present invention is to provide a method for vulcanizing and adhering rubber to a metal fitting that quickly spreads the rubber into the cavity and does not leave air.

[0005]

In order to achieve the above-mentioned object, the present invention comprises two or more upper and lower dies and two or more upper and lower dies sandwiched between the upper and lower dies. In a method in which a metal fitting is set in a circumferential cavity formed by a split mold, and rubber is injected into the metal fitting by vulcanizing and adhering to the metal fitting through an injection hole formed in one of the upper and lower molds. Set the upper mold or the lower mold so that a plurality of injection holes are located in the middle between the plurality of split surfaces where the respective end surfaces of the split mold contact each other, and inject rubber from the injection holes to form a circumferential shape. It is designed to reach the inside of the cavity.

[0006]

When the rubber is injected into the cavity through the injection hole formed in the middle between the split surfaces, the rubber is divided into the left and right from the injection hole and is filled into the cavity, and the air in the cavity is pushed out from the split surface to the outside. .

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a plane from which the upper die 1 and the metal fitting 6 are removed. The split die 3 is divided into three parts, and there are three split surfaces 3A. The injection hole 7 formed in the upper mold 1 has a split surface 3
Three corresponding to A are provided. The upper mold 1 or the split mold 3 is set so that the injection hole 7 is located in the middle between the split surfaces 3A.

FIG. 2 is a sectional view taken along the line AA of FIG. 1, showing the metal fitting 6 and the upper die 1 in phantom lines. The metal fittings 5 and 6 can be set in the cavity 4 by mounting the metal fitting 5 serving as a hub on the lower mold 2, and then mounting the split mold 3 on the outside of the upper circumferential surface of the lower mold 2. To do. At this time, the outer peripheral edge of the metal fitting 5 is attached to the split mold 3
Hold down with. If the split mold 3 and the lower mold 2 are assembled,
The annular metal fitting 6 is placed on the step portion 31 (see FIG. 3) of the split mold 3. Finally, the upper die 1 is placed on the lower die 2 and the split die 3, and at this time, the injection hole 7 is positioned in the middle of the split surface 3A.

In FIG. 4, the rubber is injected from the injection hole 7 into the cavity 4
The flow of the rubber when injected into the inside is shown, and the manner in which the rubber branches from the injection hole 7 to the left and right and is filled into the cavity 4 is shown. The rubber filled from each injection hole 7 faces each split surface 3A, and at this time, the air in the cavity 4 flows into each split surface 3A.
It is pushed out from A.

The inside of the cavity 4 is formed in a circumferential shape, but the term "circumference" as used herein means a closed curved line or a polygonal line, and is not limited to a circular or annular shape as shown in the drawing, but a polygon, an ellipse, etc. In some cases,

Further, in the illustrated embodiment, an example of the torsional damper is shown, but rubber is vulcanized and adhered to the metal fitting,
Moreover, as long as the rubber is molded in a circumferential shape, the present invention can be applied not only to the torsional damper but also to the manufacture of various vibration-proof rubbers.

Although the injection hole 7 is formed in the upper mold 2 in the illustrated embodiment, the injection hole 7 may be formed in the lower mold 1 depending on the shape of the metal fitting to be inserted.

[0014]

As described above, according to the present invention, when the rubber is injected from the injection hole located in the middle between the split surfaces, the rubber is extruded from the injection holes into the cavity substantially uniformly, Residual air exists at the most tip end of the, but the filled rubber advances toward the split surfaces, so the residual air is pushed out from each split surface to the outside. Therefore, the filling of the rubber is also performed quickly, and defects due to the delay of the filling time can be reduced. Further, it is possible to prevent the strength of the rubber from being lowered due to the formation of the air reservoir.

[Brief description of drawings]

FIG. 1 is a plan view showing a preferred embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a perspective view of a split mold.

FIG. 4 is an explanatory diagram showing a flow of rubber when rubber is injected through an injection hole.

FIG. 5 is a plan view showing a conventional example.

[Explanation of symbols]

 1 Upper mold 2 Lower mold 3 Split mold 4 Cavity 5,6 Metal fitting 7 Injection hole 3A Split surface

Continuation of front page (51) Int.Cl. ⁵ Identification code Office reference number FI Technical display area B29L 31:06 4F

Claims (1)

[Claims] 1. A metal fitting is set in a circumferential cavity formed by an upper die, a lower die, and two or more split dies provided on the side peripheral surfaces of the upper and lower dies and sandwiched between the upper and lower dies. Then, in the method of injecting rubber from the injection hole formed in one of the upper and lower molds and vulcanizing and adhering the rubber to the metal fitting, between the plurality of split surfaces where the respective end faces of two or more split molds contact each other. Set the upper mold or the lower mold so that multiple injection holes are located in the middle of, and inject the rubber from the injection hole to spread it into the circumferential cavity. Method of vulcanization adhesion.