JP2522853Y2 - Auxiliary tool for hollow fiber reinforced resin molding - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an auxiliary tool used for hollow molding a fiber reinforced resin product using an elastic bag.

[0002]

2. Description of the Related Art In recent years, FRP (glass fiber reinforced resin) products have been used for various molded products such as outer panels of automobiles. The molding of such a fiber-reinforced resin molded product is performed, for example, in the case of an engine hood W whose back surface is shown in FIG.
As shown in FIG. 2B, which is a cross-sectional view taken along the line YY of FIG. Urethane foam or the like is inserted as a core material 15 and integrally molded. By using a foaming material or the like in this way, the weight of the product can be reduced and the surface quality can be improved as compared with the case where the reinforcing fiber such as glass fiber and the resin are used alone.

[0003] Conventional molding of an FRP engine hood is performed, as in the molding method described in, for example, JP-A-2-130115, by forming a core material 15 such as urethane foam on the front and back glass fiber mats 13 and 14. Between the upper and lower molds, injecting a resin such as polyester, impregnating the resin into the reinforcing glass fiber mats 13 and 14, and curing it.
At the same time as forming the FRP layer around 5, resin layers 16 and 17 are formed on the front and back surfaces.

In Japanese Patent Application Laid-Open No. 61-207612, a reinforcing material and a FRP material are put in a cavity of a mold.
By inflating the pressurized bag in the cavity, F
There has been proposed a method of manufacturing an FRP helmet in which an RP material is distributed between an inner surface of a cavity of a mold and a pressurized bag and molded.

[0005]

[Problems to be solved by the present invention]
When heated to 120 ° C in the next coating process, the uncured portion of the urethane foam of the core material inside the engine hood reacts and releases gas, generating stress inside the FRP molded body,
Distortion, sink marks, etc. occur in the product. Although the above problem can be solved by using a high heat-resistant foam, the improvement of the heat resistance of the foam material itself is almost at its limit, and the high heat-resistant foam becomes expensive.

[0006] In the method of manufacturing an FRP helmet described in JP-A-61-207612, a reinforcing material and an FRP material are put in advance in a cavity of a mold, and a pressurizing bag is set inside the reinforcing material and the FRP material. FR by inflation of pressurized bag
The P material is filled around the reinforcing material. When the molded product has a large opening such as a helmet, the pressurized bag can be easily mounted. However, the reinforcing portion is thin and has no opening as a whole, such as an engine hood. To
A device is required to insert a pressure bag made of an elastic material such as rubber.

The present invention is applicable to forming a hollow shape (shape having a section modulus for increasing rigidity) that gives a desired strength to a molded product without using a core material such as a foam material in the FRP molded product. It is an object of the present invention to provide an auxiliary tool that can easily insert an elastic bag to be used into a desired portion of a reinforcing glass fiber mat set in a mold.

[0008]

According to the present invention, a thin plate made of a material having flexibility and rigidity is inserted into a pipe so as to be able to enter and exit through an opening at a tip end of the pipe, and the pipe is formed into a molding die. And a hollow fiber reinforced resin molding aid which is inserted into the elastic bag attached to the glass fiber mat and set inside the molding die so that the elastic bag can be inserted and expanded inside the reinforcing glass fiber mat.

[0009]

[Function] Insert the pipe of the auxiliary tool into the elastic bag attached to the molding die, push the elastic bag into the inside of the glass fiber mat for reinforcement, and extrude the thin plate from the opening at the tip of the pipe into the hollow molded part. Expand the elastic bag. Then pull out the aid,
When compressed air is supplied into the mold to expand the elastic bag, the glass fiber mat set around the elastic bag is pressed against the molding surfaces of the upper mold and the lower mold to make it hollow. When the molten resin is poured in this state, the glass fiber mat is impregnated with the resin while maintaining the hollow shape of the elastic bag, and the outer surface of the hollow elastic bag is integrally coated with the FRP layer. When the compressed air is released from the elastic bag after the resin has hardened, the elastic bag is deflated by its own elasticity, and the mold is opened and comes out of the removed molded product to remain in the molding die. Inside the molded product that has been opened and removed from the mold,
A hollow portion is formed.

[0010]

FIG. 1 (A) shows a glass fiber mat 4 for molding the outer surface of an engine hood molded product set in a lower mold 2;
Glass fiber mat 3 for the back of engine hood
2 shows a cross section of a part of a molding ready state in which the mold is set and closed. An elastic bag attachment 6 having a center hole penetrating into the mold is provided in the hollow molded portion of the upper mold 1, and an elastic bag 5 made of neoprene rubber, silicon rubber, or the like is provided in the center hole of the attachment 6. The mouth is inserted and the end of the mouth is fixed by a flange 7. The flange 7 is provided with an opening 7a for mounting the plug 12 of the air supply hose 11.

Auxiliary tool 10 for attaching elastic bag 5 to hollow molded part
Is inserted through the opening 7a of the flange 7 into the elastic bag 5 around the center hole of the fixture 6, and as shown in FIG. And two thin plate pieces 9 and 9 made of a rigid material are put in. The tip of each thin plate 9 passes through the side opening 8a at the tip of the pipe 8, respectively.
The bulge 9a is formed at the tip.

Next, the molding of the hollow fiber reinforced resin molded product will be described. A glass fiber mat 4 is set on the lower mold 2, and a glass fiber mat 3 preliminarily formed so as to form the insertion opening 3 a is set on the upper mold 1, and the auxiliary tool is inserted through the opening 7 a of the flange 7 of the upper mold 1. 10 and insert the elastic bag 5 at the end of the pipe 8 through the insertion opening 3a.
Put inside. When the sheet pieces 9 are pushed down after the mold is closed, each sheet piece 9 protrudes laterally from the opening 8 a of the pipe 8 and expands the elastic bag 5 along the hollow forming portion.

Next, the auxiliary tool 10 is removed, a plug 12 is attached to the opening 7a of the flange 7, compressed air is supplied from the air supply hose 11, and the elastic bag 5 is inflated with air pressure higher than the resin injection pressure. Then, the glass fiber mats 3 and 4 set around the elastic bag 5 are pressed against the molding surfaces of the upper mold 1 and the lower mold 2. When the molten resin is poured into the mold in this state, the resin is impregnated into the glass fiber mats 3 and 4 while maintaining the hollow shape of the elastic bag 5, and the outer surface of the hollow elastic bag 5 is integrally coated with the FRP layer. Is done. After the resin is cured, when the plug 12 is removed and the air pressure is released, the elastic bag 5 is deflated by its own elasticity, and the mold is opened to come out of the removed molded product and remains in the upper mold 1. At this time, if the inside of the elastic bag 5 is vacuum-evacuated, the elastic bag 5 can be easily extracted from the molded product.

Since the elastic bag 5 inserted through the opening 3a of the glass fiber mat 3 is extended along the hollow forming portion at the tip of the thin piece 9, a bulging portion 9a is provided, so that the elastic bag 5 may be damaged. Instead, the elastic bag 5 can be used repeatedly. As the material of the elastic bag, other materials can be used as long as the material is an elastic body that is not affected by the solvent of the injected resin and withstands the temperature of the injected resin. The auxiliary tool of the present invention can be applied to a hollow molding using an elastic bag of a building structure other than an automobile part such as an engine hood or an outer panel.

[0015]

According to the present invention, it is possible to easily dispose an elastic bag in a hollow portion when molding into a hollow shape having high rigidity without using a foam material core.

[Brief description of the drawings]

FIG. 1 is a sectional view of an embodiment of the present invention.

FIG. 2 is a rear view and a partial cross-sectional view of a conventional FRP engine hood.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Upper mold 2 Lower mold 3, 4 Glass fiber mat 5 Elastic bag 6 Fixture 7 Flange 7a Flange opening 8 Pipe 9 Thin plate piece 10 Auxiliary tool 11 Air supply hose 12 Plug

Claims (1)

(57) [Scope of request for utility model registration] 1. A thin plate made of a material having flexibility and rigidity is inserted into a pipe so as to be able to enter and exit through an opening at a tip end of the pipe, and the pipe is inserted into an elastic bag attached to a molding die. A hollow fiber reinforced resin molding aid, characterized in that an elastic bag is inserted and expanded inside a reinforcing glass fiber mat set in a molding die.