JPH02225014A - Method and apparatus for manufacturing vibration insulating rubber product - Google Patents

Abstract

PURPOSE:To contrive to shorten process by a method wherein rubber material is poured in the molding cavities of respective split molds under the state that said cavities are separated from each other and, after that, reinforcing yarns are set between the rubber materials and finally the respective split molds are closed together so as to pressurize and vulcanizing form the rubber material. CONSTITUTION:A pouring plate is inserted between split molds 12 and 14, which are arranged by vertically separating a mold 10, so as to pour rubber material with an injection device in respective molding cavities 16 of the split molds. Next, the split molds 12 and 14 and the pouring plate 24 are separated from each other. And reinforcing yarns 38 held on holding pins 36 are set to the molding cavity 16 of the lower split mold 14. Further, though the rubber material is filled in the molding cavity 16 at this time, the setting space for the reinforcing yarns 38 is ensured in the molding cavity 16 so as to set the reinforcing yarns 38 in said space. After the reinforcing yarns 38 are set, the split molds 12 and 14 are closed together. A plurality of molds 10, each of which is formed by clamping the split molds 12 and 14 together, are housed in an outer frame and vertically pressurized and heated.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method and apparatus for manufacturing a vibration-proof rubber product, particularly a vibration-proof rubber product in which reinforcing threads are embedded inside.

(Prior Art) A steering rubber coupling is a type of anti-vibration rubber product. This steering rubber coupling is disposed at a predetermined position on the operating force transmission path in the steering device, and has an overall disc shape as shown in FIGS. It has through holes 100 for connection at certain locations, and reinforcing threads 102 are embedded inside.

This steering rubber coupling has conventionally been manufactured by the method shown in FIG. That is, first, an unvulcanized rubber sheet is separated, a disc-shaped sheet rubber 104 is punched and formed from this rubber sheet, and one of the sheets is inserted into the connecting hole 100.
After setting the reinforcing thread 102 so that it fits into the pin 106 protruding from the mold, placing the reinforcing thread 102 on top of it, and setting the other sheet rubber 104 on top of it, close the Venus to make the whole. It was made to be pressurized and vulcanized.

However, in this method, there is a step of kneading the rubber, a step of dividing the rubber into a sheet, a step of punching the sheet into a disk shape having connecting holes 100, a step of punching and molding the sheet rubber 104, and a separate step. Prepared reinforcing thread 10
Sheet rubber 104.2 requires a large number of steps, such as the process of overlapping the rubber sheets and setting them in a mold, and the process of closing the molds and pressurizing and vulcanizing them. Since the reinforcing yarn 102 must be set manually, automation is difficult and production efficiency is low.

Also, a disk-shaped sheet rubber 10 is made from the separated rubber sheet.
When punching and forming 4, a large amount of rubber was lost, which led to problems such as increased material costs.

(Means for Solving the Problems) First Solution The invention of the present application has been made to solve the above problems, and the first solution is a method of manufacturing a vibration-proof rubber product. The gist of this is a method for manufacturing vibration-proof rubber products in which reinforcing threads are embedded inside, such as steering rubber couplings, in which split-type molds are used as molds, and each split mold is Rubber material is injected into each molding cavity with the molding cavities separated from each other, and then each split mold is closed with reinforcing threads set between the rubber materials in each molding cavity. The purpose is to pressurize and vulcanize.

The second solution is related to a manufacturing device, and its gist is a manufacturing device for vibration-proof rubber products in which reinforcing threads are embedded inside steering rubber couplings, etc. (a) A mold consisting of a pair of split molds; (a) A member inserted between each split mold, which is an inlet for introducing the rubber material from an injection nozzle into the inside; and the split mold. an injection plate having a discharge port opening into each of the molding cavities of the split mold and a passage connecting them, and a convex portion that fits into either or both of the cavities of the split mold; ) An outer frame mold is provided for accommodating a plurality of molds made of the divided molds and applying pressure from a pressurizing device to the molds all at once.

(Operations and effects of the first solution) In this manufacturing method, since the rubber material is directly injected into the mold, the steps of rubber kneading, dispensing the rubber sheet, and punching can be omitted.

Conventionally, a disk-shaped sheet rubber was prepared in advance and set in the mold together with reinforcing thread. This is because when the rubber material is injected, the threads are disturbed due to the injection pressure, the flow of the rubber, etc., and the product cannot be made in good quality.However, in the method of the present invention, the rubber material is injected into the cavities of the mold separately. This makes it possible to set the reinforcing system after the rubber material is injected, which allows the rubber kneading process.

This makes it possible to omit the steps of dispensing the rubber sheet and punching it.

Furthermore, since it is now possible to directly inject the rubber material into the mold, it becomes possible to use an injection device as the injection means, which greatly improves production efficiency and eliminates the difficulty of conventional mechanical work. Sheet rubber (disk shape in case of steering rubber coupling)
This eliminates the work of setting the mold into the mold, making it possible to automate the entire process.

In addition, since there is no rubber loss caused by punching and molding the sheet rubber, material costs are also reduced.

(Operations and effects of the second solution) Furthermore, by using the device according to the second solution of the present application, the above method can be suitably carried out, and the manufacturing device can also convert a plurality of molds into outer frame molds. Gather them together and pressurize them all at once.
Since vulcanization molding is used, there is no need to increase the number of products each mold can take, and if it is possible to reduce the number of products each mold can take, for example, the number of products can be reduced by 1. If the rubber material is injected into the mold from the injection device, there will be no variation in the amount of rubber material filled for each product. However, pressure and vulcanization molding can be performed simultaneously on a large number of molds using an outer mold, so products can be produced with high efficiency even when the number of molds is reduced.

In addition, when the rubber material is filled into the cavity of each split mold in the single-piece manufacturing equipment, a certain space is created by the convex part of the injection plate, that is, a space for setting the reinforcing thread, so that the reinforcing thread setting work is facilitated. Not only is it easy, but the reinforcing threads do not become disordered during pressurization and vulcanization molding.

(Example) Next, an example in which the present invention is applied to manufacturing a steering rubber car 2 ring will be described in detail based on the drawings.

In FIGS. 2 and 3, reference numeral 10 denotes a single-cavity mold, which is divided into upper and lower division molds 12 and 14.

This mold 10 has a molding cavity 16 inside, and also has a spacer pin 18, a reinforcing thread setting bin 20, and a positioning bin 22, which will be described later.

In FIG. 1, 24 is a pouring plate, +1 & type l
0 is vertically separated into each divided mold 12.14, and inserted between the divided molds 12.14. This injection plate 24 has an inlet 26 for introducing the rubber material from the nozzle of the injection device into the inside, and each divided mold 12.
．． It has a discharge port 28 that opens into 14 molding cavities 16, and a runner part (passage) 30 that connects them, and has a convex part 32 that fits into each cavity 16, and these convex parts 32 fills a portion of the molding cavity 16.

In FIG. 5, reference numeral 34 denotes a thread setting device, which has holding bins 36 in which reinforcing threads 38
It is designed to be able to hold.

In FIG. 4, 40 is an outer frame mold, which is divided into an upper frame mold 42 and a lower frame mold 44, and each divided mold 42.44 has a recess 46 for accommodating a plurality of molds IO. has been done. The depth of each recess 46 is such that the combined depth thereof is somewhat shallower than the height of the mold 10.

Next, the procedure for manufacturing a steering rubber coupling using this apparatus will be explained.

As shown in FIG. 1, the mold 10 is vertically divided into divisions 512 and 14, and the injection plate 24 is inserted between them, and the protrusion 32 is inserted into each division mold 12 and 14. It is in a state where it is fitted into the cavity 16. In this state, the injection device 1200 injects the rubber material into each molding cavity 16 through the runner portion 30 of the injection plate 24 .

Next, the split molds 12 and 14 and the injection plate 24 are separated, and the reinforcing thread 38 held in the holding bin 36 is set in the molding cavity 16 of the lower split mold 14, as shown in FIG. At this time, the molding cavity 16 is filled with a rubber material, but a space for setting the reinforcing thread 38 is secured therein, and the reinforcing thread 38 is set within this space.

After setting the reinforcing thread 38 in this way, the split mold 12
．． Then, as shown in FIG. 4, a plurality of these molds 10 are housed in the recesses 46 of the outer frame mold 40, and the outer frame mold 40 is closed together. In this state, if the outer frame mold 40 is pressurized and heated from above and below, a plurality of steering rubber couplings are molded at once.

Thus, according to the present method and apparatus, steering rubber couplings can be produced extremely simply and efficiently.

Furthermore, since the reinforcing threads 38 are not disturbed, the strength necessary for the steering rubber coupling is ensured.

Although the embodiments of the present invention have been described in detail above, the present invention can also be applied to the production of other vibration-proof rubber products other than the above-mentioned steering rubber coupling, that is, vibration-proof rubber products in which reinforcing threads are embedded inside. Moreover, it is also possible to change the device configuration as appropriate within the spirit of the present invention.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a mold and a pouring plate of a manufacturing apparatus according to an embodiment of the present invention, FIG. 2 is a partially cutaway plan view of the mold shown in FIG. 1, and FIG. It is a sectional view taken along the line ■-■ in FIG. 2. FIG. 4 is a perspective view showing the structure of the outer frame mold in the same apparatus, and FIG. 5 is an explanatory view of one step in a method for manufacturing a steering rubber coupling using the same apparatus. FIG. 6 is a partially cutaway plan view of the steering rubber coupling, FIG. 7 is a sectional view taken along the line -■ in FIG. 6, and FIG. 8 is an explanatory diagram of a conventional manufacturing method of the steering rubber coupling. lO: Molding mold 12, 14: Split mold 16: Molding cavity 26: Introduction hole 30: Passage 38: Reinforcement thread 24: Injection plate 28: Discharge port 32: Convex portion 40: Outer frame mold Fig. 5

Claims (2)

[Claims] (1) A method for manufacturing a vibration-proof rubber product in which reinforcing threads are embedded inside a steering rubber coupling, etc., comprising:
A split-type mold is used as the mold, the forming cavities of each split mold are separated from each other, and a rubber material is injected into each molding cavity, and then a reinforcing thread is inserted between the rubber materials in each molding cavity. With the set,
A method of manufacturing a vibration-proof rubber product, which is characterized by closing each split mold and pressurizing and vulcanizing it. (2) A manufacturing device for a vibration-proof rubber product in which reinforcing threads are embedded inside a steering rubber coupling, etc.,
(a) A mold consisting of a pair of split molds, (b) A member inserted between each split mold, which is an inlet for introducing the rubber material from the injection nozzle into the inside, and a molding of the split mold. (c) an injection plate having a discharge port opening into each of the cavities and a passage connecting the cavities, and a convex portion that fits into either or both of the divided cavities; A molding apparatus for a vibration-proof rubber product, comprising an outer frame mold that accommodates a plurality of the molds made up of split molds and applies pressurizing force from a pressure device to the molds all at once.