JPH064294B2 - Method for manufacturing FRP beam - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a method for manufacturing an FRP bead used as a lightweight structural material.

[Conventional technology]

3 and 4 are perspective views showing a conventional method of manufacturing a beam made of FRP. In the figure, (1) is a core material, (2) is an inner layer material, (3) is an intermediate layer material, (4) is an outer layer material, (5) is a side plate, (6)
Is an adhesive, (7) is a filament winding layer, (8) is an oriented fiber, and (1a) is a cell opening.

In the manufacturing method shown in FIG. 3, an inner layer material (2) made of FRP, an intermediate layer material (3), and an outer layer material (4) are layered on the upper and lower surfaces of a core material (1) such as a honeycomb core, and side plates ( The beam (10) is manufactured by stacking 5) and adhering with the adhesive (6).

In the manufacturing method shown in FIG. 4, the inner layer material (2) is laminated on the upper and lower surfaces of a mandrel (not shown), and the filament winding layer (7) impregnated with resin is formed on the inner layer material (2) by the filament winding method. The outer layer material (4) is overlaid on both sides, inserted into a molding die, heated and pressed to cure the resin, and then the mandrel is removed to manufacture the beam (10).

[Problems to be solved by the invention]

However, the manufacturing method of FIG. 3 has the problems that the fibers of the bonded portion are discontinuous and the strength of the beam (10) is small because the bonding area cannot be wide.

Further, in the manufacturing method of FIG. 4, since it has a hollow structure, it has a problem that it is weak against pressure from above and below and that the load is not evenly distributed over the entire surface against bending.

The present invention is intended to solve the above problems, and an object of the present invention is to provide a method for manufacturing an FRP beam that can obtain a FRP beam having high strength.

[Means for solving problems]

According to the method of manufacturing an FRP beam of the present invention, a sandwich material is formed by stacking an inner layer material made of FRP having a fiber orientation in the longitudinal direction on both sides of a long core material so as to cover the cell openings. This is a method in which filaments impregnated with a resin are obliquely wound around the outer periphery of a material so as to cross each other to form a filament winding layer, and the resin is cured.

[Work]

In the method of manufacturing an FRP beam according to the present invention, an inner layer material is overlaid on both sides of a core material to form a suditch material, and a resin-impregnated filament winding layer is formed on the outer periphery of the sandwich, and the resin is cured to form FRP. Manufacture beam. In this case, no mandrel for filament winding is required during manufacturing.

The beam thus manufactured has a large strength because the fibers in the filament winding layer are continuous and the sandwich material is inside.

〔Example〕

FIG. 1 is a perspective view of a beam manufactured according to an embodiment of the present invention, and FIGS. 2A to 2E are perspective views of respective steps in the manufacturing method. In FIGS. The same reference numerals denote the same or corresponding parts. Beam (10) is core material (1)
The filament winding layer (7) is formed on the outer circumference of the sandwich material (11) in which the inner layer material (2) is stacked on the upper and lower surfaces of
The outer layer material (4) is laminated on both upper and lower sides of the structure.

First, as shown in FIG. 2 (A), the FRP beam is manufactured by covering the cell openings (1a) of the long core material (1) with fibers (8) in the longitudinal direction on the upper and lower surfaces. Inner layer material with
The sandwich material (11) is formed by stacking (2). Next, as shown in (B), the filaments (13) are impregnated with resin through the delivery machine (12) of the winding machine to the outer periphery of the sandwich material (11) by the filament winding method, and the filaments (13) are slanted so as to cross each other. The filament winding layer (7) impregnated with resin is formed by winding in a direction. Subsequently, as shown in (C), the outer layer material (4) is laminated on the upper and lower sides of the filament winding layer (7) to form a composite material (14). This composite material (14) is inserted into a molding die (15) as shown in (D), and heated and pressed to cure the resin to manufacture a beam (10) shown in (E). In this case, since the filament winding is performed on the outer periphery of the sandwich material (11), no mandrel is required, and it is particularly suitable for manufacturing a large beam (10).

Since the fibers (8) of the filament winding layer (7) are continuous, the beam (10) thus manufactured has high strength, particularly strength against twisting. Further, since the sandwich material (11) is inside the filament winding layer (7), the shearing force is uniformly applied to the upper and lower surfaces, and the strength is increased. The presence of the outer layer material (4) further increases the strength, but it is not necessary.

In the above description, the shape of the beam (10) is not limited to that shown in the figure, and can be arbitrarily selected.

〔The invention's effect〕

According to this invention, since the filament winding layer having the fiber orientation in the oblique direction so as to intersect with each other is formed on the outer periphery of the sandwich material including the core material and the inner layer material, the core material and the fiber Therefore, there is an effect that an FRP beam having high strength can be manufactured without using a mandrel.

[Brief description of drawings]

FIG. 1 is a perspective view of a beam manufactured according to an embodiment, and FIG.
(A) ~ (E) is a perspective view showing each step in the manufacturing method,
3 and 4 are perspective views of the conventional method. In each figure, the same reference numerals indicate the same or corresponding parts, (1) is a core material, (2) is an inner layer material, (4) is an outer layer material, (7) is a filament winding layer, (10) is a beam, ( 11) It is a sandwich material.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location B29L 31:06 4F

Claims (2)

[Claims] 1. A sandwich material is formed by stacking an inner layer material made of FRP having a fiber orientation in the longitudinal direction on both sides of a long core material so as to cover the cell openings, and a resin is provided on the outer periphery of the sandwich material. A method of manufacturing a beam made of FRP, which comprises winding the impregnated filaments in an oblique direction so as to cross each other to form a filament winding layer and curing the resin. 2. A method for manufacturing an FRP beam according to claim 1, wherein an outer layer material is laminated on the outside of the filament winding layer to cure the resin.