JPH07119021B2 - Method for manufacturing rubber pad for rubber shock absorber - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a rubber pad in a rubber shock absorber.

[Prior Art and Problems to be Solved by the Invention] A rubber shock absorber 102 formed by stacking a large number of rubber pads 100 as shown in FIG. Set up.

The rubber pad 100 is in a form in which a rubber block is fixed to a plate metal fitting, and in which a rubber block is fixed only to one surface side of the plate metal fitting and in both surfaces of the plate metal fitting. There is one in which a rubber block is fixed to the side.

Here, in the case where the rubber block is fixed to only one surface of the plate metal fitting, it is molded by an injection molding method, that is, the plate metal fitting is set inside the molding die. A method of injecting a rubber material into each cavity of a molding die through a pouring port from a nozzle of an injection machine and filling the cavity can be suitably adopted.

However, it is difficult to obtain such a plate fitting having rubber blocks on both sides by injection molding. This is because the rubber blocks on both sides are blocked by the plate fittings.

Therefore, the rubber pad 100 having such a configuration is used.
For, conventionally, the amount of unvulcanized rubber required for molding the rubber block was previously measured and preformed, and the operator manually set this in each cavity of the mold,
After that, a compression molding method has been adopted in which the molding dies are closed and compression molding is performed.

However, this method involves many troublesome work steps and must be manually performed by an operator, which makes automation difficult.

As shown in FIG. 5 (B), the plate fitting 104 is provided with a communication hole 106 for communicating the rubber block on one surface side with the rubber block on the other surface side. A method of molding a rubber pad having a rubber block on both sides of the plate metal fitting 104 by injection molding may be considered, but in the case of a rubber pad used under a high load, such a communication hole 106 is plated. If it is provided on the metal fitting 104, there is a risk of cracking from there, and it cannot be used in reality.

Further, a runner communicating with the rubber block molding cavities 108 on both sides of the plate fitting 104 is provided in the molding die, and the rubber material injected from one injection port is passed through each runner to each molding cavity. It is not unthinkable to lead to 108.

However, in this case, the runner has to be considerably long and has a complicated shape, and since the rubber pad is used under high load, the rubber hardness is high (rubber flow is poor. ), It is practically difficult to cause such a material to flow into each molding cavity 108 after running a long runner, and this method cannot be adopted.

[0011]

The present invention has been made to solve the above problems, and its gist is to provide a rubber pad for a rubber shock absorber in which rubber blocks are fixed to both surfaces of a plate metal fitting. In the manufacturing method, (a) a runner plate having therein a runner communicating with each cavity for molding the rubber block in the molding die is set at a setting position of the plate metal fitting of the molding die. Process,
(B) a step of injecting a rubber material through the injection hole of the mold and causing the rubber material to flow into the molding cavities on both sides of the runner through the runner of the runner plate, and (c) the rubber material After injection and filling, the mold is opened to replace the runner plate and the plate metal fitting for the rubber pad, and then the mold is closed to vulcanize and mold the injected rubber material. And the step of fixing to the plate fitting.

[Operation and Effect of the Invention] As described above, according to the present invention, a runner plate having a runner inside is prepared and set in a molding die to inject a rubber material. is there.

In this way, the rubber material injected from the injection port flows through the runner of the runner plate, and then is positioned on the rubber block molding cavity of the mold, that is, on both sides of the plate fitting. It flows into a cavity for molding a rubber block, and the cavity is filled with a rubber material.

After each cavity is filled with the rubber material, the molding die is opened, the runner plate is removed, the original plate metal fittings are set, and the molding die is closed for vulcanization for a predetermined time. Then, the desired rubber pad, that is, the rubber pad in which the rubber blocks are fixed to both surface sides of the plate fitting, is obtained.

According to the present invention, it is possible to manufacture the rubber pad for the rubber shock absorber having the rubber blocks on both sides of the plate fitting by the injection molding method. Therefore, it becomes possible to automate the manufacturing of the rubber pad.

[0016]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 2 shows an example of the rubber pad, and the rubber pad 10 has a form in which a plurality of rubber blocks 14 are fixed at symmetrical positions on both sides of the plate fitting 12. In FIG. 2B, reference numerals 16 and 18 respectively denote a fitting projection and a fitting recess for positioning when the rubber pads 10 are superposed.

FIGS. 3 and 4 show a runner plate used in injection molding the rubber pad 10. The runner plate 20 is divided into split bodies 22 and 22. Are fastened by bolts 26 in the bolt holes 24.

The runner plate 20 is provided with runners 28 extending radially on the mating surface side of each divided body 22, and further, the gate 3 is provided at the tips of these runners 28.
0 is provided. Further, a communication hole 32 for connecting the center portion of the runner 28 and the sprue of the molding die is provided.

FIG. 1 specifically shows a procedure for molding the rubber pad 10 using the runner plate 20. As shown in FIG. 1A, in the method of this embodiment, first, the runner plate 20 is set between the upper mold 34 and the lower mold 36. At this time, the runner 28 has three gates.
0 through the molding cavities 3 of the upper mold 34 and the lower mold 36
It is in a state of communicating with 1. Molding cavity 31 here
Are for molding the rubber blocks 14 on both sides of the plate fitting 12 in the rubber pad 10, respectively.

Now, in this way, the runner plate 20
After setting, the rubber material in a fluid state is injected from the nozzle of the injection machine to the injection port 42 of the upper mold 34. The injected rubber material passes through the sprue 44 of the upper mold 34 and the runner 28 of the runner plate 20 and flows from the respective gates 30 into the inside of the molding cavity 31 to be filled with the rubber material. .

After this step is completed, the upper mold 34 and the lower mold 36 are opened and the runner plate 20 is taken out. At this time, the rubber material filled in the molding cavities 31 is cut at the gate 30 and remains in the cavities 31.

Along with this, the plate fitting 12 is attached to the holding member 4
0 and 0 are set in a forming die including an upper die 34 and a lower die 36. Here, the holding body 40 has a recess 38, in which the plate fitting 12 is held.

After the plate metal fitting 12 is set, the upper mold 34 and the lower mold 36 are then closed again and kept under pressure / heating for a predetermined time to vulcanize the rubber material in the cavity 31 and Is fixed to the plate fitting 12.

As described above, according to the present invention, first, the plate fitting 1
In the state where there is no 2 and using the runner plate 20, the rubber material is filled in the cavity 31 for molding the rubber block 14 in the rubber pad 10, and then the runner plate 20 is removed and the plate is removed. The metal fitting 12 is set and vulcanized and molded.

As a result, the rubber blocks 1 on both sides in the state of being cut off by the plate fittings 12 in the product state.
4 can be injection-molded, the manufacturing of the rubber pad 10 becomes significantly simpler than in the past, and it is possible to automate this.

Although the embodiment of the present invention has been described in detail above, this is merely an example, and the present invention can be applied to various other types of rubber pads, etc. within a range not departing from the gist thereof. It can be configured with various modifications based on the knowledge of those skilled in the art.

[Brief description of drawings]

FIG. 1 is an explanatory view of each step of a method of manufacturing a rubber pad according to an embodiment of the present invention.

FIG. 2 is a diagram showing an example of a rubber pad.

3 is an exploded perspective view of the runner plate in FIG. 1. FIG.

FIG. 4 is a cross-sectional view of the runner plate in FIG.

FIG. 5 is a background explanatory view of the present invention.

[Explanation of symbols]

 10 rubber pad 12 plate metal fitting 14 rubber block 20 runner plate 28 runner 31 molding cavity 34 upper mold 36 lower mold 42 injection hole

Claims (1)

[Claims] 1. A method of manufacturing a rubber pad for a rubber shock absorber, comprising a rubber block fixed on both sides of a plate metal fitting.
(A) a step of setting a runner plate having therein a runner communicating with each cavity for molding the rubber block in the molding die at a setting position of a plate metal fitting of the molding die; ) A step of injecting a rubber material through the injection hole of the molding die and causing the rubber material to flow into the molding cavities on both sides of the runner through the runner of the runner plate, and (c) injecting and filling the rubber material. Then, the molding die is opened to replace the runner plate and the plate fitting for forming the rubber pad, the molding die is closed, and the injected rubber material is vulcanized and the plate is formed. A method of manufacturing a rubber pad for a rubber shock absorber, comprising the step of fixing to a metal fitting.