JPH0414171Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to an apparatus for producing soundproofing materials whose main constituent material is foamed polyurethane. The present invention relates to an apparatus suitable for manufacturing a multilayer soundproofing material.

(Prior art) Conventionally, this type of soundproofing material has been used by forming a foamed polyurethane layer on a skin made of synthetic rubber, and the foamed layer is placed in contact with a steel plate to form a so-called double wall structure. It has an excellent soundproofing effect.

Recently, it has become clear that foamed polyurethane layers formed into multiple layers with different specific gravity, expansion ratio, etc. are acoustically superior, and an efficient manufacturing method has been desired.

However, it is difficult to stack a second foam layer on top of the first foam layer and mold them at the same time because they have different expansion ratios. The second foam layer molded with another mold is molded into the first foam layer.
was adhered to the foam layer. This resulted in inconveniences such as peeling of both foam layers.

(Problems to be Solved) The present invention eliminates these inconveniences, allows for continuous molding of two or more foam layers, and allows for easy removal of the molded product from the mold, resulting in high production efficiency. The purpose is to provide a molding device.

(Means for solving the problem) A plurality of lower molds are provided at predetermined intervals in the circumferential direction on a rotatable turntable, and each of the lower molds is mounted on a fixed frame arranged above the lower molds. At least two types of first and second upper molds are sequentially provided corresponding to the rotational position of the lower mold, and a lower mold elevating device that raises the lower mold toward the upper mold group and brings them into alignment; An injection device for injecting a foamable resin material from each upper mold when the lower mold and the upper mold match, and an injection device for releasing the foamed resin molded product formed by the lower mold and each upper mold into the lower mold. It consists of a mold release device installed in each upper mold that introduces compressed air from the upper mold side, and when at least the second upper mold matches the lower mold, the primary molding is performed by the first upper mold and the lower mold. The product is characterized in that a resin injection gap is provided in the upper layer of the product to allow injection of a foamed resin material.

The combination of the lower mold and upper mold in this invention is
There are various combinations. When forming a two-layer foam layer, the upper mold is provided with a first upper mold and a second upper mold. The first foam layer is molded using the first upper mold and the lower mold, and then, with this primary molded product accommodated, the lower mold is rotated under the second upper mold by a turntable to bring the two molds together. to form a second foam layer. When forming three or more foam layers, a first upper mold, a second upper mold, a third upper mold, and a plurality of types of upper molds are sequentially disposed. As in the case of two layers, in this case, only the lower mold is moved to the second layer while the primary molded product in which the first foam layer is formed by the first upper mold and the lower mold is accommodated.
Then, the second foam layer is molded using the second upper mold and the lower mold, and similarly, the third foam layer is molded using the third and fourth upper molds and the lower mold. Molding the fourth foam layer. In either case, the second and third upper molds, etc. must form enough voids to form a new foam layer on top of the foam layer formed by the previous upper mold and lower mold. Must be. Furthermore, each upper mold is equipped with a mold release device that introduces compressed air so that the molded product can be easily released from the lower mold after molding of the foam layer is completed.

The lower mold elevating device may be provided on each lower mold, but it may also be provided at the elevating position of each lower mold so that it operates only when the lower mold rotates.

A device that injects resin when the upper and lower molds are aligned may be provided at each injection position, but the injection nozzle is rotated in synchronization with the rotation of the lower mold, and different types of resin are injected from the same nozzle. You can do it like this. Since each upper mold is provided on a fixed frame, this injection device is installed so that injection is performed from the upper mold side.

(Function) Since the present invention is constructed in this way, first, synthetic rubber that will serve as the skin is attached to the lower mold, and the lower mold is raised and matched with the first upper mold by a lifting device, and both molds are combined by a resin injection device. Inject it inside and heat it to foam it.
Molding the foam layer. The molded first foam layer is released into the lower mold by compressed air introduced into the upper mold by a mold release device. Next, after the lower mold is lowered by the lifting device, the lower mold is moved to the second mold by the turntable.
Rotate it under the upper mold. After that, the lower mold is raised by a lifting device to match the second upper mold, and from the second upper mold side, resin is injected onto the first foam layer by a resin injection device and heated and foamed to form a second foam layer. do.
The molded first and second foam layers are released into the lower mold by compressed air introduced into the upper mold by a mold release device. When the third upper mold, the fourth upper mold, etc. are provided, the third foam layer, the fourth foam layer, etc. are molded in the same manner. Then, when the final molding is completed, it is removed from the lower mold.

(Example) A more detailed explanation will be given below with reference to FIGS. 1 to 3 showing an example of implementation of the present invention.

FIG. 1 is a front view thereof, FIG. 2 is a plan view thereof, and FIG. 3 is a side view thereof.

1 is a turntable, 2 is a lower mold, 3 is a first upper mold, 4 is a second upper mold, 5 is a fixed frame that holds the upper molds 3 and 4, 6 is a lifting device for the lower mold 2, and 7 is a This is a resin injection device.

More specifically, the turntable 1 has a substantially circular shape, is rotatably provided on rollers 9 of a circular rail 8 laid on the floor G, and is rotated by a gear around a central axis 11 by an electric motor 10. column (not shown).

The lower molds 2 were provided at intervals of 90 degrees in the circumferential direction around the central axis 11 on the turntable 1.

One set of first upper molds 3 was provided in the diametrical direction of the turntable 1, and both were provided above the fixed frame 5 in correspondence with the rotating position of the lower mold 2. The second upper mold 4 is provided as a set in the diametrical direction of the turntable 1 like the first upper mold 3. It is provided above in correspondence with the rotation position of No. 2. Reference numeral 12 denotes a column that supports the fixed frame 5.

The lower mold elevating device 6 raises and lowers the support base 13 of each lower mold 2, and is raised and lowered by an air cylinder device 14.

The resin injection device 7 has an injection head 16 to which resin liquid is supplied from a resin supply unit 15 to each of the upper molds 3 and 4.
Two types of resin liquids having different specific gravity and expansion ratio are supplied from the nozzle 17 to the upper molds 3 and 4 through the nozzle 17. 18
is an introduction hole for compressed air for mold release provided in the upper molds 3, 4, and is connected to a compressed air supply device (not shown) to release the molded product formed by the upper molds 3, 4 and the lower mold 2. A mold release device is configured to release the mold from the upper molds 3 and 4 to the lower mold 2.

Next, the operation of the implementation device will be explained.

First, a synthetic rubber skin is attached to the lower mold 2 shown at the top and bottom of FIG. 2. Next, the lower mold 2 is raised toward the first upper mold 3 by the lifting device 6, and the two molds are brought into alignment. Thereafter, a resin liquid is injected by the resin injection device 7 and heated to form a first foam layer. Then, air is introduced from the compressed air introduction hole 18 of the first upper mold 3 to release the primary molded product from the first upper mold 3.
After that, the lower mold 2 is lowered by the lifting device 6,
The turntable 1 is rotated (counterclockwise in the upper part of FIG. 2) and the lower mold 2 is moved to a position directly below the second upper mold 4 while storing the primary molded product. Next, lower mold 2
is raised toward the second upper mold 4 by the lifting device 6, and the two molds are brought into alignment. Then, the resin injection device 7 injects resin liquids having different specific gravity and expansion ratio onto the first foam layer of the primary molded product accommodated in the lower mold 2 via the second upper mold 4. Furthermore, it is heated and foamed to obtain a secondary molded product having a second foamed layer. after that,
After air is introduced again through the compressed air introduction hole 18 and the molded product is released from the mold, the lower mold 2 is lowered by the lifting device 6 and the molded product is taken out.

(Effects) As is clear from the above, when the present invention is used, the lower mold is rotated by the turntable, and the lower mold and various upper molds such as the first and second upper molds sequentially It is possible to efficiently mold a multi-layered molded product consisting of foamed resin layers. In particular, each upper mold is equipped with a mold release device that introduces compressed air to release the molded product into the lower mold after molding, making it easy to release the molded product from each molding process into the lower mold. This reduces the time required for subsequent molding with the upper mold and improves production efficiency. Furthermore,
Since other foam layers can be molded by laminating the primary molded product etc. in the lower mold, it is possible to produce a multilayer foam molded product in which each layer is extremely strongly integrated. Furthermore, since the introduction position of the skin and the removal position of the molded product are different, handling of the product is easy.

[Brief explanation of drawings]

What is illustrated is an example of implementation of the present invention,
1 is a front view thereof, FIG. 2 is a plan view of FIG. 1, and FIG. 3 is a side view of FIG. 1. 1... Turntable, 2... Lower die, 3... First upper die, 4... Second upper die, 5... Fixed frame, 6...
Lower mold lifting device, 7...resin injection device.

Claims (1)

[Scope of utility model registration request] A plurality of lower molds are provided on a rotatable turntable at predetermined intervals in the circumferential direction, and a fixed frame is provided above the lower molds, and the lower molds are arranged in a manner corresponding to the rotational position of each lower mold. At least two kinds of first upper molds and second upper molds provided in sequence, a lower mold elevating device for raising the lower molds toward the upper mold group and matching them, and the lower molds and the upper molds are matched with each other. An injection device that injects foamable resin material from each upper mold, and compressed air installed in each upper mold to release the foamed resin molded product formed by the lower mold and each upper mold to the lower mold. and a mold release device that introduces the foamed resin material from the upper mold side, and at least when the second upper mold matches the lower mold, the foamed resin material is injected into the upper layer of the primary molded product formed by the first upper mold and the lower mold. A multilayer casting device characterized by providing a resin injection gap that allows resin injection.