JPS62193811A - Vacuum cast-molding apparatus - Google Patents

Abstract

PURPOSE:To enable a product of continuous length to be molded by standing vertically both side walls of vacuum chambers faced each other and by forming an opening to be closed with a plate. CONSTITUTION:When the size of a product to be molded is larger than the volume of one vacuum chamber 12, multi-numbers of vacuum chambers 12 are set in a line depending on the size of the product in such a way that the side walls vertically standing each other should tightly contact and be connected each other through openings 28. After a mold for casting is placed in the multi- numbers of vacuum chambers 12 being combined, plates 30 are set on both outer side walls 26 of both ends of the vacuum chamber 12 and a vacuum pump P is thereafter moved. Air in the vacuum chamber 12 is thereby evacuated through an opening 16 and the plates 30 are thereby tightly adhered on the side walls 26 and a required degree of vacuum can be achieved. Then, a valve device 40 of a guide pipe 38 is opened and a supplying guide pipe 36 is recovered from a closing state. At the same time, a liquid plastic raw material is sucked into a casting mold and cured in it to become a product.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a vacuum casting apparatus, and particularly to an apparatus for casting plastics under vacuum.

[Background of the Invention] There are many types of coplastic molding methods, all of which are aimed at mass-producing plastic products.

However, when making a prototype in the process of developing a new product, or when trying to manufacture a limited number of plastic products, cast molding can be used economically without using expensive molds. A device that can do this is desirable.

For this purpose, for example, a vacuum casting machine is used that creates a casting mold from silicone rubber, places it in a vacuum box, and injects liquid plastic raw material into the mold to form the mold. being developed.

This type of conventionally developed @-placement has the disadvantage that because the dimensions of the vacuum box are limited to the desired dimensions, it is not possible to cast products larger than that dimension, such as long products. There is profit.

[Object of the invention] Considering the problems mentioned above, the main object of this invention is to:
To provide a vacuum cast molding device for plastic snacks that can easily produce products ranging from small to large products.

A further object of this invention is to have a simple structure;
The object of the present invention is to provide a plastic vacuum cast molding device that can work extremely efficiently and is ideal for manufacturing a small number of prototypes.

An object of the present invention is to enable vacuum chambers to be used individually and to connect a plurality of vacuum chambers for use.
An object of the present invention is to provide a portable vacuum casting molding device for plastics.

[Structure of the Invention] Preferred embodiments of the invention will be described with reference to the accompanying drawings. The vacuum casting apparatus consists of a plurality of rectangular hollow vacuum chambers 12. The rear wall 14 of each vacuum chamber 12 has a flexible hose connected to a suitable vacuum pump P]-
1 is provided with an opening 16 to which one end can be connected. The upper wall 18 of the vacuum chamber 12 can be provided with an operation panel 20 equipped with necessary equipment such as a pressure gauge, which is common in conventional devices of this type. A viewing window 22 can be provided.

The viewing window 22 can also be provided in the front wall 24 of the vacuum chamber 12, if necessary. In addition, a door that can be opened and closed by attaching a hinge or other suitable mechanism to the front wall 24 is also provided.
(not shown in the drawing) can be installed.

Large openings 28 are formed in the upright and opposing side walls 26 of the vacuum chamber 12 . A solid plate 30 is provided that closes the opening 28 of the both side walls 26 and can be used as a partition wall. It is desirable that the plate body 30 be a thick iron plate.

Further, wheel devices 1!32 are provided at the bottom of the vacuum chamber 12 at positions close to its four corners, and wheel devices 1!
so that it can be moved to the desired position.

In consideration of the layout of a factory in which the device 1t10 of the present invention is used, a rail 34 may be laid to serve as a guide rail for the wheel device 32 of the vacuum chamber 12.

Further, on the upper wall 1a of the vacuum chamber 12, a raw material container M containing at least two types of plastic materials that cause a chemical reaction and solidify when mixed is placed in a casting mold disposed in the vacuum chamber 12.
A guide tube 38 is provided for feeding from S via a flexible injection conduit 36, for example a rubber or vinyl tube. This guide 1!38 has a valve device 1 with a handle.
140 is provided for inserting the injection conduit 36 into the guide tube 38 and connecting its outer end to the casting mold.

[Operation of the Invention] Since the vacuum cast molding apparatus of the present invention is constructed as described above, the size of the product to be molded depends on the width of one vacuum chamber 12. If it is possible to do so, a desired injection mold is placed in the vacuum chamber 12, and the vacuum chamber 12 is opened so that the flexible conduit 3G for material injection is inserted into the injection port of the injection mold. Guide 'a3 provided on the upper wall 18 of
8, and the other end is connected to a container MS containing liquid plastic raw material, and the valve device 1f40 of the guide pipe 38 is closed. Benso@40 is this kind of [! When the flexible injection conduit 36 made of plastic or the like is inserted into the guide tube 38 and the valve fitting @ 40 is closed, the valve body crushes a part of the conduit 36 and the raw material container MS occlude the passageway of the conduit from the injection mold to the injection mold.

Under the above-mentioned conditions, the plate members 30 are applied from the outside to the openings in both side walls 2G of the vacuum chamber 12, and the vacuum pump is operated. Then, the air inside the vacuum chamber 12
The plate 30 that is removed through the opening 1θ of No. 4 and applied to the opening 28 is adsorbed and tightly attached to the side wall 26, and the inside of the vacuum chamber 12 is evacuated to a desired degree of vacuum. When the vacuum chamber 12 is evacuated, the inside of the injection mold disposed within the vacuum chamber 12 is naturally also evacuated.

Then, the valve device 240 of the guide @38 is released 171.

'Thereby, the flexible injection conduit 36 self-recovers from its occluded condition. At the same time, the liquid plastic raw material is sucked from the raw material container MS into the injection mold, which has a vacuum inside, and fills the void inside the injection mold, and then hardens inside and is molded into the desired shape of the product. Ru.

By the way, when the size of the product to be molded is larger than the volume of one vacuum chamber 12, for example, when molding a long product such as a car bumper,
Depending on the size, a plurality of vacuum chambers 12 are arranged in a line so that their side walls 26 are in close contact with each other. Thereby, the vacuum chambers 12 are interconnected through the openings 28 in the side wall 2G.

Therefore, an injection mold of a desired size is placed in a plurality of vacuum chambers 12 combined with these, plate members 30 are applied to the outer side walls 26 of the vacuum chambers 12 at both ends, and the vacuum pump P is turned on. Activate. The subsequent working process is as described for Bamboo, thereby making it possible to mold a desired large-sized product that cannot be molded using only one vacuum v12.

[Effects of the Invention] As is obvious from the above description, the vacuum cast molding apparatus of the present invention is effective when molding a product of a size that can be molded in the volume of one vacuum chamber 12. ,1
Only one vacuum chamber 12 needs to be applied to it, and when one product cannot be molded with the capacity of one vacuum chamber 12, a plurality of vacuum chambers 12 may be arranged in line with each other. By forming one vacuum chamber as a whole, this requirement can be easily met.

In the embodiment described above, each vacuum v12 is provided with an opening 14 in its both side walls 26, but when used in combination, the openings 14 are provided in the opposite side walls of the vacuum chambers 12 arranged at both ends. 26 may not have the opening 14 and may have a solid side wall. Furthermore, it is desirable to provide a suitable seal around the periphery of the opening 14, and also to attach a suitable handle to the plate 30, which serves as a partition that closes the opening 14.
1112 dedicated machines can be used. In addition, in the technical content described in the claims of this invention,
Needless to say, it can be modified and implemented.

[Brief explanation of drawings]

Fig. 1 is a schematic perspective view for explaining the vacuum chamber of the vacuum cast molding apparatus of the present invention, Fig. 2 is a schematic diagram showing the case where each vacuum chamber is used separately, and Fig. 3 is a schematic diagram showing a case where a plurality of vacuum chambers are used. It is a schematic diagram showing the case where they are connected in series and used. The main reference numbers and characters in the drawings are listed below. 12...Vacuum chamber 14...Rear side wall 16...Flexible hose (F() connection opening 26...Side wall 28... Opening 30...Plate body 32 serving as a partition wall...Wheel device 34...Rail 36...Injection conduit 38...Guide pipe 40 ... Valve device MS ... Raw material container P ... Vacuum pump Fig. 1 Fig. 2 Fig. 3

Claims (1)

[Claims] 1. A vacuum chamber that can be connected to a vacuum pump and accommodates a mold for molding liquid plastic raw material therein, and at least opposing side walls of the vacuum chamber are upright. an opening in the upright side wall; a plate for closing the opening in the side wall; and a tube for introducing liquid plastic raw material into the mold that is attached to the vacuum chamber and accommodated therein. a guide pipe for guiding the plastic raw material; a valve device with a handle provided on the guide pipe so as to be able to also close the plastic raw material introduction pipe; and a wheel device for moving the vacuum chamber. A vacuum cast molding apparatus characterized in that the vacuum chambers are used alone or in combination with each other. 2. The vacuum cast molding apparatus according to claim 1, wherein the opening in the side wall is provided only on one upright side wall.