JP2006272911A - Vacuum injection molding method for fiber-reinforced plastic - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vacuum injection molding method for a fiber-reinforced plastic which enables efficient molding by diffusing a resin in a bag film in a short time and can also cope with the occurrence of defective impregnation. <P>SOLUTION: A resin injection hole 51 is formed in the surface of the bag film 5, a resin injection jig 10 is set in the injection hole 51, and a resin injection tube 9 is connected to the jig 10 to inject the resin. The jig 10 has a disk-shaped base part 101 and an approximately cylindrical injection part 103 and is connected/fixed to the resin injection hole 51 of the bag film 5 through an airtight adhesion material 6. The resin injection jigs 10 are installed in a plurality of places of the bag film 5 to make the multi-point injection of the resin. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a vacuum injection molding method for fiber reinforced plastic.

  As a lightweight and high-strength material, fiber reinforced plastic (FRP) is attracting attention in various industrial fields. Among them, carbon fiber reinforced plastic is being frequently used due to its excellent mechanical properties. Such fiber reinforced plastics are often formed by a conventional hand lay-up molding method, but this is not preferable for producing a relatively large molded body, and costs are high. In recent years, a vacuum injection molding method in which molding is performed in a reduced pressure environment by vacuum suction is being adopted.

The basic technique of this type of vacuum injection molding method is disclosed in, for example, Patent Document 1, in which a fiber layup layer is disposed in a mold and an injection tube for resin distribution is disposed thereon. The bag is covered with a bag film, the periphery thereof is sealed, and a molded body is obtained by injecting a resin into the vacuum-sucked bag film.
JP-A-10-504001

  The conventional vacuum injection molding method is a technique used for manufacturing a thin molded product among various molding methods, and a type in which a resin injection tube is disposed inside a bag film has been adopted. Therefore, in the case of forming a relatively large molded body, it is difficult to uniformly diffuse the injected resin with such an injection tube, and it is not easy to obtain a molded body without impregnation failure. In particular, in the molding of carbon fiber reinforced plastic, since the thickness of the molded product is thin, it is required to control the injection time of the resin short, and the resin can be uniformly impregnated into the reinforcing fiber material in a short time. In the unlikely event that impregnation failure occurs, few countermeasures have been established, and a method for correcting impregnation failure by an appropriate measure has been required.

  The present invention has been made in view of the circumstances as described above, regardless of the size and thickness of the molded body, it is possible to efficiently mold by diffusing the resin in the bag film in a short time, In addition, we have realized a vacuum injection molding method for fiber-reinforced plastic that can cope with the occurrence of impregnation failure. It provides fiber reinforced plastic.

  In order to achieve the above-described object, the present invention provides a sheet-like reinforcing fiber material on a mold, and the reinforcing fiber material is hermetically covered on the mold with a bag film so that the inside can be decompressed. In a vacuum injection molding method of fiber reinforced plastic in which a resin is injected into a bag film in a vacuum state with a source connected, a resin injection hole is provided on the bag film surface, and a resin injection jig is installed in the injection hole. It includes a step of connecting an injection tube for injecting resin into the bag film to the resin injection jig, injecting the resin, and impregnating and integrating the reinforcing fiber material. The resin injection jig includes a disk-shaped base portion having an injection port in the center and a substantially cylindrical injection portion connected to the injection port, and the base portion is provided with an airtight adhesive material. And connected and fixed to the resin injection hole of the bag film.

According to this invention, it becomes possible to inject a resin into an appropriate location in the bag film as needed. And by such a shaping | molding method, the fiber reinforced plastic which is a lightweight, high intensity | strength and highly rigid raw material can be manufactured at low cost, suppressing volatilization of styrene etc. under the stable physical property.

  In the vacuum injection molding method having the above-described configuration, the present invention provides a resin injection hole on the surface of the upper bag film in the non-impregnated portion after the resin is injected into the bag film, and a resin injection jig is installed again. Resin injection is performed.

  As a result, in the unlikely event that a poor impregnation between the reinforcing fiber material and the injected resin occurs in the bag film, a resin injection jig is installed on the bag film surface, and the resin is injected directly into the unimpregnated portion. This can be corrected. Thereby, stable product supply becomes possible.

  Furthermore, the present invention is characterized in that, in the vacuum injection molding method having the above configuration, resin injection jigs are installed at a plurality of locations on the surface of the bag film to inject the resin at multiple points. Thereby, it can shape | mold efficiently, diffusing resin to the whole shaping | molding part in a short time.

  According to the vacuum injection molding method of the fiber reinforced plastic of the present invention configured as described above, resin can be injected as needed into an appropriate location in the bag film. Even if impregnation failure with the injected resin occurs, it can be corrected immediately, and multi-point injection and intermediate injection of the resin can be performed, and the resin can be efficiently molded while diffusing the resin throughout the molded part in a short time Can do. This makes it possible to mold high-quality fiber-reinforced plastic with increased strength while suppressing manufacturing costs under stable physical properties.

  Hereinafter, the best mode for carrying out the vacuum injection molding method for a spiral guide plate according to the present invention will be described with reference to the drawings.

  1 to 3 show a vacuum injection molding method for fiber-reinforced plastic according to the present invention, FIG. 1 is a sectional view schematically showing the vacuum injection molding method, and FIG. 2 is a vacuum injection molding method using a resin injection jig. FIG. 3 is an overall perspective view of a vacuum injection molding method using a resin injection jig.

  In the vacuum injection molding method for fiber-reinforced plastic according to the present invention, the sheet-like reinforcing fiber material 2 is first disposed on the mold 1 and then proceeds. The reinforcing fiber material 2 is preferably a woven or non-woven fabric such as glass fiber or carbon fiber.

  Next, the release sheet 3 is laid on the mold 1 on which the reinforcing fiber material 2 is disposed. The release sheet 3 enhances the release property of the cured injection resin, and a sheet made of an injection resin and a non-adhesive material is preferable.

  An injection resin injection tube 9 is disposed between the reinforcing fiber material 2 and the release sheet 3. As the injection tube 9, for example, a porous conduit having a hollow cross section, a conduit formed by spirally winding a long strip member, and the like are preferable. Such an injection tube 9 is installed on the upper surface or the edge of the mold 1 using an adhesive material, a seal tape, or the like.

  Next, as shown in FIG. 3, a resin diffusion net 4 is laid on the release sheet 3. The resin diffusion net 4 promotes the diffusion of the injected resin. The resin diffusion net 4 impregnates the injected resin into the reinforcing fiber material 2 evenly and can diffuse the injected resin over the entire desired range on the mold 1. A sheet material is preferred.

  Subsequently, the mold 1 on which the release sheet 3 and the resin diffusion net 4 are laid is airtightly covered with the bag film 5. The bag film 5 is not particularly limited as long as it is an airtight synthetic resin film material generally used in this type of vacuum injection molding method. Then, the bag film 5 is fixed to the surface of the mold 1 by using a sealing material 7 such as an adhesive material or a seal tape at the peripheral edge of the mold 1. Thereby, between the shaping | molding die 1 and the bag film 5 is comprised as an airtight and sealed shaping | molding part. Further, a decompression source 8 is connected to the end of the mold 1 covered with the bag film 5 to suck in the air in the molded part and depressurize it.

  In injecting the resin, the reduced pressure source 8 depressurizes the inside of the molded part of the bag film 5 to make a vacuum state. Then, in a reduced pressure environment by such vacuum suction, a resin is injected from the injection tube 9 and diffused into the molding part. As the injection resin, for example, a low-viscosity vinyl ester resin, an unsaturated polyester resin, an epoxy resin, and the like are preferable. The injected resin is evenly diffused throughout the molded portion through the resin diffusion net 4 and impregnated into the reinforcing fiber material 2.

  Although a molded body can be obtained in this way, there are various reasons for impregnation of the resin, and there is a possibility that poor resin impregnation occurs in the fiber reinforced material. Thus, when impregnation failure occurs, it is desirable to obtain a good molded article by correcting the unimpregnated portion by the following procedure.

  In this case, a resin injection hole 51 is provided on the surface of the upper bag film 5 in the generated unimpregnated portion A. The resin injection jig 10 is connected to the resin injection hole 51. As shown in FIG. 2, the resin injection jig 10 includes a disc-shaped base 101 having an injection port 102 in the center, and a substantially cylindrical injection portion 103 erected so as to be connected to the injection port 102. Is formed.

  The resin injection jig 10 is connected and fixed to the resin injection hole 51 of the bag film 5 with an airtight adhesive material 6 such as butyl rubber interposed between the base 101 and the bag film 5. An injection tube 9 that can inject resin into the bag film 5 is connected to the injection portion 103 of the resin injection jig 10.

  Resin is injected into the unimpregnated portion A again through the resin injection jig 10 in a reduced pressure environment by vacuum suction. Thereby, the air in the unimpregnated portion A is sucked and the reinforcing fiber material 2 can be impregnated with the injected resin. When the resin injection is completed in this way, the injected resin is cured while maintaining the vacuum state in the molded part, whereby the resin injected into the unimpregnated portion A can be integrated with the other portions to form one molded body. .

  Further, by using such a resin injection jig 10, it is possible to inject multiple points of resin into the bag film 5. That is, for example, as shown in FIG. 3, resin injection holes (51) are provided at two locations on the surface of the bag film 5, and the resin injection jig 10 is installed on the surface of the bag film 5 through an adhesive material (6) such as butyl rubber. Fix it. Then, the injection tube 9 is connected to the injection portion 103 of each resin injection jig 10, and the resin is injected from two places into the bag film 5, so that the resin can be efficiently diffused while being diffused throughout the molding portion. be able to.

  Thus, according to the vacuum injection molding method of the fiber reinforced plastic according to the present invention, even if impregnation failure occurs in the molded body, it is immediately corrected and an appropriate shape in which the resin is uniformly impregnated is obtained. And a molded product of quality can be obtained. Further, by using the resin injection jig 10, it is possible to inject multiple points of resin or in the middle of injection, and it is possible to mold efficiently and in a short time.

In addition, since the physical properties can be stabilized as compared with conventional molding methods, the product strength can be increased, and high-quality fiber-reinforced plastic can be formed regardless of the skill level of the operator. The volatilization problem such as can be solved.

  INDUSTRIAL APPLICABILITY The present invention can be used for manufacturing a fiber reinforced plastic in a short time while ensuring a certain quality.

It is sectional drawing which shows typically the vacuum injection molding method of the fiber reinforced plastic concerning this invention. It is a partial expansion perspective view which shows the vacuum injection molding method of this invention. It is a whole perspective view which shows the vacuum injection molding method of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mold 2 Reinforcing fiber material 3 Release sheet 4 Resin diffusion net 5 Bag film 51 Resin injection hole 6 Adhesive material 7 Seal material 8 Depressurization source 9 Injection tube 10 Resin injection jig 101 Base 103 Injection part

Claims (3)

A sheet-like reinforcing fiber material is disposed on the mold, and the reinforcing fiber material is hermetically covered with the bag film on the mold, and a vacuum source capable of reducing the pressure inside is connected to the vacuum bag film. In the vacuum injection molding method of fiber reinforced plastics for injecting resin,
A resin injection hole is provided on the bag film surface, and a resin injection jig is installed in the injection hole, and an injection tube for injecting resin into the bag film is connected to the resin injection jig to inject the resin into the reinforcing fiber. Including impregnating and integrating the material,
The resin injection jig includes a disk-shaped base portion having an injection port in the center, and a substantially cylindrical injection portion connected and erected to the injection port, and the base portion is provided with an airtight adhesive material. A vacuum injection molding method for fiber-reinforced plastic, characterized by being connected and fixed to a resin injection hole of a film.   2. The resin injection is performed again after injecting the resin into the bag film, providing a resin injection hole on the surface of the upper bag film in the unimpregnated portion, and installing a resin injection jig. Vacuum injection molding method for fiber reinforced plastics.   3. The method of vacuum injection molding fiber reinforced plastic according to claim 1, wherein resin injection jigs are installed at a plurality of locations on the surface of the bag film to inject the resin at multiple points.

Images