JPH0349934A - Manufacture of fiber reinforced composite material - Google Patents

Abstract

PURPOSE:To prevent reinforcing fibers from being disturbed, while the volume content of fibers is controlled by a method in which molding tools are arranged on alternate unit cell, and side-pressurizing jigs are arranged on the positions where the molding tools are not arranged, whereby reinforcing fibers are formed under pressure and cured between the sides of the molding tools and the jigs. CONSTITUTION:Molding tools are arranged on alternate unit cell 5 of reinforcing fibers 3a, 3b, 3c, and side-pressurizing jigs 6 are arranged on the positions where the molding tools are not arranged. The reinforcing fibers 3a, 3b, 3c impregnated with thermosetting resin are inserted between the molding tools 1 and reinforc ing fiber-fixing jigs 7 on the sides of the molding tools along each side 2, and they are laminated. Then, the reinforcing fibers 3a, 3b, 3c are lamination-formed respectively in three directions continuously and alternately. Then, the bending due to its dead weight which causes the disturbance of the rein forcing fiber is prevented with the reinforcing fiber-fixing jig 7. After the lamination of reinforcing fibers 3a, 3b, 3c, the reinforcing fibers 3a, 3b, 3c are formed under pressure with the side-pressurizing jigs 6 so that the thickness of said fiber becomes a prescribed thickness between the side of the molding tool 1 and said jig, and are cured, thereby producing fiber reinforced composite material.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for manufacturing fiber-reinforced composite materials such as lightweight structures made of CFRP (carbon fiber reinforced plastic).

[Conventional technology]

FIG. 2 is a perspective view with the upper part of the mold cut away in a conventional manufacturing method. In the figure, (1) is a mold, which is formed into a columnar shape with an equilateral triangular cross section, and is arranged side by side so that each side (2) faces each other. (3a), (
3b) and (3c) are reinforcing fibers impregnated with a thermosetting resin, which are inserted and laminated along each side (2) of the mold (1) into the gap (4).

The mold (1) is made of reinforcing fibers (3a) t (3b),
(3c) is arranged for each unit cell (5) formed by.

The conventional manufacturing method of fiber-reinforced composite materials involves reinforcing fibers (3a), (3b), (3) impregnated with thermosetting resin.
c) in the gap between the molds (1) (
4) and then cured to produce a fiber reinforced composite material.

[Problem to be solved by the invention]

However, in such conventional manufacturing methods, reinforcing fibers impregnated with resin are laminated in the gaps between the molds.
The only way to pressurize the reinforcing fibers is to stuff the reinforcing fibers into the gaps in the mold, which makes it difficult to control the fiber volume content and prevent the reinforcing fibers from becoming disordered.

The present invention was made to solve the above-mentioned problems, and it is possible to control the fiber volume content and prevent disorder of the 1-reinforced fibers, and it is also suitable for the production of large-scale fiber-reinforced composite materials. The purpose of this study is to obtain a method for manufacturing suitable fiber-reinforced composite materials.

[Means to solve the problem]

The method for producing a fiber-reinforced composite material of the present invention has an equilateral triangular or square unit cell, and in each side of the unit cell, reinforcing fibers are continuously impregnated with resin in three or two directions. In a manufacturing method for fiber-reinforced composite materials in which layers are alternately laminated and cured, molds are placed every other unit cell, and a side pressure jig is placed in areas where molds are not placed, thereby pressing against the sides of the molds. This is a method in which reinforcing fibers are pressure molded and hardened in between.

In this case, 1. In order to prevent the reinforcing fibers from becoming disordered, a reinforcing fiber fixing jig is placed with a predetermined gap at each intersection of the reinforcing fibers and at both ends of the reinforcing fibers to prevent the reinforcing fibers from becoming disordered due to slack. can do.

[For production]

In the manufacturing method of the present invention, a mold is arranged every other unit cell, reinforcing fibers impregnated with resin are laminated continuously along each side of the mold in three directions or alternately in two directions. Using a pressure jig, the laminated reinforcing fibers are pressure-molded onto the side surface of the mold and cured to produce a fiber-reinforced composite material.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a cross-sectional view showing a mold in the manufacturing method of the embodiment, and in the figure, the same reference numerals as in FIG. 2 indicate the same or corresponding parts. The mold (1) is reinforced fiber (3a) =
(3b) - (3c) are arranged every other unit cell (5) (equilateral triangle in the case of this example), and the mold (1) is arranged so as to face each side of the mold (1). A side pressure jig (6) is placed in the area where 1) is not placed. In addition, each intersection of reinforcing fibers (3a), (3b), (3c) and reinforcing fibers (3a), (3b), (3
Reinforced fiber fixing jigs (7) are arranged at both ends of c).

The method for producing a fiber reinforced composite material includes reinforcing fibers (3a), (3b), (3c) impregnated with a thermosetting resin on the side of a mold (1) along each side (2), Molding mold (1
) and the reinforcing fiber fixing jig (7) and stacking them.

In this case, reinforcing fibers (3a), (3b), (3
c) is continuous in three directions, (3a), (3b
) - (3c) are alternately laminated and molded in this order. At this time 1
Deflection due to its own weight, which causes disorder of the reinforcing fibers, is prevented by the reinforcing fiber fixing jig (7).
After laminating a), (3b) and (3c), the reinforcing fiber (3a) is removed using a side pressure jig (6).

(3b) and (3c) are pressure-molded with the side surface of the mold (1) to a predetermined thickness and cured to produce a fiber-reinforced composite material.

In the above embodiment, the mold (1) has an equilateral triangular cross section, but it may also have a square shape.

〔Effect of the invention〕

As described above, according to the present invention, a mold is arranged every other unit cell, and the reinforcing fibers are pressurized by the side pressure jig, so the fiber volume content can be controlled, and the reinforcing fibers are It also has the effect of preventing disturbances.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a manufacturing method according to an embodiment of the present invention, and FIG. 2 is a perspective view showing a manufacturing method according to a conventional example. In each figure, the same reference numerals indicate the same or corresponding parts, (1)
(3a), (3b), (3c) are reinforcing fibers, (6) is a side pressure jig, and (7) is a reinforcing fiber fixing jig.

Claims (1)

[Claims] (1) Fiber reinforcement that has an equilateral triangular or square unit lattice and is made by laminating reinforcing fibers impregnated with resin continuously in the direction of each side of the unit lattice, alternately in three or two directions, and then hardening. In a method for manufacturing composite materials, molds are placed every other unit cell, a side pressure jig is placed in areas where molds are not placed, and reinforcing fibers are pressure-molded and hardened between the sides of the mold. A method for producing a fiber-reinforced composite material.