JP2968300B2 - Composite material joining method and joining jig - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial application field) The present invention relates to a composite material which prevents bending of an outer plate at a joint between a girder member of the composite material and an outer plate of the composite material. To a joining method and a joining jig.

(Prior Art) For example, when forming a fiber-reinforced resin laminated part having a honeycomb core used in the aviation and space industries, as shown in FIG. The outer plate may be bent at the joint portion 32 with the outer plate 31 of the first case.

As means for preventing the outer skin of the joint portion from bending, for example, a method of forming a composite material product disclosed in Japanese Patent Application Laid-Open No. 1-164046 is known.

The method of molding a composite material product described in Japanese Patent Application Laid-Open No. 1-164046 discloses a method in which a precured precured sheet is interposed between constituent members of a woven fabric or unidirectional material (prepreg material) impregnated with a resin. An adhesive is applied to the joint surface of the resin, and the whole is heated and pressurized to cure integrally, thereby preventing the local bending of the reinforcing fibers in the components and the unevenness of the plate thickness. .

In addition, a method for manufacturing a honeycomb sandwich structure using a composite material disclosed in Japanese Patent Publication No. 57-18499 discloses a method in which an outer plate made of an uncured prepreg material is coated on a surface of an aerodynamic surface side of a previously hardened thin plate, in the form of a film. Glue through the adhesive,
A technical means is described in which a honeycomb core is bonded to a surface of a thin outer plate opposite to the aerodynamic surface side via a film-like adhesive to form a honeycomb sandwich structure having a high surface smoothness.

(Problems to be Solved by the Invention) In a technical means for preventing a local bending of reinforcing fibers in a component part and an uneven thickness of a prepreg material by interposing a precure sheet between constituent members of a prepreg material, a precure sheet or a thin sheet It requires the installation of jigs for forming and hardening the plate, the cutting of the outer shape, and the surface treatment before applying the adhesive, which increases the production cost, increases the load on the curing oven (autoclave), and increases the number of jigs. The increase in the load on the molding chamber due to
This is a limitation on mass production of molded products.

Further, in the technical means for forming a honeycomb sandwich structure having a high surface smoothness by bonding an outer plate made of uncured prepreg material and a honeycomb core to a pre-cured thin plate outer plate via a film-like adhesive, In order to use the outer skin located in the area as a thin outer skin, the outer skin must be dimensioned to cover the entire structure, and for laminated materials researched and developed to reduce the weight of the structure, etc. This imposes restrictions on the laminated structure.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and has a composite in which a filler is formed into a precise size with a resin material to prevent the outer skin from being bent at a joint between a composite girder and a composite outer plate. An object of the present invention is to provide a method of joining materials and a joining jig.

[Configuration of the invention]

(Means for Solving the Problems) The method of joining composite materials according to the present invention comprises disposing a core material on the outer surface of a girder of a fiber-reinforced resin composite material having a U-shaped cross section, In a joining method of a composite material in which an outer plate of a fiber-reinforced resin composite material is joined to a lower surface, a flat plate is brought into contact between a pair of girders to which the outer plate is bonded, and formed between a bent portion of the girder and the flat plate. The space is filled with a resin, the filled resin is cured, the resin is joined to the beam, and a core material is arranged so as to be in contact with the beam and the cured resin, and the outer plate is joined.

The joining jig of the present invention includes a joining jig body having a flat portion extending in contact with and extending from a girder-shaped outer surface of a fiber-reinforced resin composite material having a U-shaped cross section. A groove provided in the joining jig body at a position where the abutment ends and the joining material and the joining jig body are separated from each other, and a resin filling space which is fitted into the groove and elastically contacts the girder material together with the girder material and the joining jig body. And an elastic body that forms

(Operation) In the method of joining composite materials of the present invention, a filler is formed of resin to fill a space formed between a bent portion of the girder of the composite material and a core material joined to the girder, and the joining is performed. It has a shape corresponding to the space formed between the bent portion and the flat plate, and is molded to a precise size, so that finishing processing is not required, so that the reinforcing fiber of the girder material is not cut and the filler The workability is improved compared to the method using prepreg material, and the resin filler is molded to a exact size,
The number of steps is reduced accordingly.

In the joining jig of the present invention, the elastic force provided in the groove formed in the joining jig body at the position where the bent portion of the girder material starts is elastically contacted with the surface of the girder material, and the girder material and the joining jig body are used. Form a partitioned resin filling space, and form a filler in a shape corresponding to the space formed between the bent portion and the flat plate with the resin filled in this resin filling space, so that the filler is molded to a regular size, Moreover, the resin filled in the resin-filled space does not leak from the resin-filled space due to the elastic body elastically in contact with the surface of the girder material.

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

In FIG. 1 and FIG.
A joining jig main body having a shape is shown, and a groove 2 extending in a lateral direction is formed on an outer surface of a long side portion 1a of the joining jig main body 1. The groove 2 is formed by bending the beam 3 when the beam 3 is brought into contact with the outer surface of the joining jig body 1 so that the upper end of the beam 3 is aligned with the upper end of the long side portion 1a. It is a position corresponding to the part 4a where the part 4 starts. The above groove 2
The elastic body 5 formed of, for example, silicon rubber is fitted into the elastic member 5. The portion of the elastic body 5 protruding from the groove 2 is as follows:
A resin-filled space 6 is formed between the beam 3 and the joining jig body 1 by elastically contacting the surface of the beam 3. And in the resin filling space 6,
For example, the filler 7 is formed by filling and curing with an epoxy resin.

The joining surface of the joining jig body 2 with respect to the beam 3 is coated with a tetrafluoroethylene resin layer 8 so as to ensure the releasability of the filler 7 and the adhesiveness of the adhesive surface.

In order to join the composite girder 3 and the composite outer plate 9, first, a filler 7 is provided on the composite girder 3. In order to form the filler 7, the composite girder 3 and the joining jig body 1 are arranged such that the portion 4a where the bent portion 4 starts is located in the groove 2 of the long side portion 1a of the joining jig body 1. And clamped together by a clamp device 10 as shown in FIG. As a result, the elastic body 5 provided in the groove 2 elastically contacts the surface of the girder 3 and fills the resin filling space 6 formed between the girder 3 and the joining jig body 1 with the epoxy resin material. This is performed by curing the resin material.

When the filler 7 is joined to the beam 3 (FIG. 4),
The spar member 3 is placed so that the bent portion 4 and the filler 7 are located at predetermined positions on the outer plate 9 as shown in FIG. 3, and the core 10 is arranged so as to be in contact with the spar member 3 and the outer plate 9. The material 3 and the outer plate 9 are joined.

FIG. 5 shows another embodiment of the present invention. In this embodiment, grooves 21 and 22 are provided at positions corresponding to the start end and the end of the bent portion 4a of the girder 3 of the joining jig body 20, respectively. Is inserted,
By elastically contacting these elastic members 23 and 24 with the beam 3, the beam 3
A resin filling space 25 is formed between the resin filling space 25 and the joining jig main body 20, and the resin filling space 25 is filled with, for example, an epoxy resin. The filling of the resin filling space 25 with the epoxy resin is performed by an injection hole 27 provided in the joining jig body 20.

〔The invention's effect〕

The method of joining a composite material according to the present invention comprises disposing a core material on the outer surface of a girder of a fiber-reinforced resin composite material having a U-shaped cross section, In the joining method of a composite material for joining plates, a flat plate is brought into contact with a girder to which an outer plate is joined, and a resin is filled into a space formed between a bent portion of the girder and the flat plate, and filled. The cured resin is cured and joined to the girder material, and the core material is arranged so as to be in contact with the girder material and the cured resin, and the outer plate is joined. In addition, the workability is improved as compared with the method using a prepreg material, and the resin filler is molded to a regular size, so that the number of steps is reduced accordingly.

A joining jig for a composite material according to the present invention includes a joining jig body having a flat portion extending in contact with the outer surface of a girder of a fiber reinforced resin composite material having a U-shaped cross section, and a jig for joining the girder. A groove provided in the joining jig body at a position where the abutment with the fitting body ends and the girder material and the joining jig body are separated from each other; and a girder material and the joining jig body fitted in the groove and elastically contacting the girder material. And an elastic body that forms a resin filling space, so that there is no leakage of the resin material to an adjacent portion, and a resin filler of a desired shape is formed.
Can be formed without the need for finishing work.

[Brief description of the drawings]

FIG. 1 is a view showing a use state of a composite material jig of the present invention, FIG. 2 is an enlarged view showing a filler forming portion, FIG. 3 is a view showing a composite material bonding method of the present invention, FIG. FIG. 5 is a view showing a state where a filler is joined to a girder, FIG. 5 is a view showing another embodiment of a joining jig for a composite material of the present invention, and FIG. 6 is a conventional girder of a composite material and an outer plate. It is a figure which shows the junction part. DESCRIPTION OF SYMBOLS 1 ... Jig body, 2 ... Groove 3 ... Girder member 4 ... Bending part 5 ... Elastic body 7 ... Filler 9 ... Outer plate
10 ... core.

Continuation of the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) B29C 65/00-65/70 B29C 70/00-70/88 B29C 69/00

Claims (2)

(57) [Claims] 1. A composite in which a core material is arranged on the outer surface of a fiber reinforced resin composite material having a U-shaped cross section, and a fiber reinforced resin composite material outer plate is joined to upper and lower surfaces of the beam and the core material. In the method of joining materials, a flat plate is brought into contact between the girders to which the outer plate is joined,
Fill the space formed between the bent part of the girder plate and the flat plate with resin, cure the filled resin and join it to the girder material, and arrange the core material so as to be in contact with the girder material and the cured resin And joining the outer plates together. 2. A joining jig body having a flat portion extending in contact with an outer surface of a girder of a fiber-reinforced resin composite material having a U-shaped cross section, and abutment between the girder and the joining jig body. At the part where the girder material and the joining jig body are separated from each other, and a groove provided in the joining jig body, and fitted into the groove to elastically contact the girder material, thereby joining the girder material and forming a resin filling space. A joining jig comprising an elastic body.