JPH10195213A - Material for molding composite material and production of composite material part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the subject material capable of simply testing oriented and meandering conditions of fibers in the interior thereof at a low cost after molding a composite material part by integrating a tracer comprising a fibrous material in a specific state into a material comprising the reinforcing fibers and a matrix resin. SOLUTION: This material is produced by arranging a tracer comprising a hollow fibrous organic material (a thermoplastic resin such as polyphenylene sulfide) or a hollow fibrous inorganic material (glass fibers, etc.) in the same direction as that of reinforcing fibers in the form of a woven cloth, a sheetlike substrate or a tow in a material (a prepreg) comprising the reinforcing fibers (the glass fibers, carbon fibers, etc.) and a matrix resin (an epoxy resin, etc.), integrating the tracer into the material and composing the material. For example, the epoxy resin and carbon fibers are used and the hollow fibrous tracer 2 (the hollow glass fibers having 0.3mm outside diameter and 0.03mm wall thickness) is integrated in the same direction as that of the reinforcing fibers in, e.g. the prepreg 1, using the epoxy resin and carbon fibers and having the resin content regulated to 37-43wt.% and 0.6mm thickness.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a material for forming a composite material applicable to the manufacture of a composite material part of an aircraft requiring light weight and a method of manufacturing a composite material part using the same.

[0002]

2. Description of the Related Art In the production of composite material parts applied to aircraft parts and the like, a woven, tape-like or tow-like material for forming a composite material (hereinafter referred to as a prepreg).
Are arranged and laminated on a molding jig in an arbitrary fiber direction, and are heated and cured to perform molding. In this case, even if the prepregs are carefully arranged at the time of lamination, if the deformation occurs due to the pressure at the time of molding, the fiber arrangement state and fiber meandering state of the laminated and cured product cannot be guaranteed, and non-destruction using X-rays There is a disadvantage that it is difficult to confirm even when performing an inspection. FIG. 6 shows one method of solving such a disadvantage.
As shown in FIG. 1, there is known a carbon fiber material 10 which is a reinforcing fiber, in which Kevlar yarn 11 is incorporated as a tracer. Further, as a method for confirming the internal fiber arrangement state, a method using a tracer having a specific gravity different from that of the prepreg has been proposed (Japanese Patent Application No. 7-247539). In the embodiment, a method using a metal wire as the tracer has been proposed. Is described.

[0003]

In the conventional prepreg, in the case where Kevlar yarn is incorporated as a tracer into the carbon fiber material as described above, the fiber arrangement state and the fiber meandering state on the outermost surface of the part can be confirmed, There was a drawback that the quality of the product could not be confirmed. Further, according to the method using the metal wire, the internal quality can be confirmed. However, there is a disadvantage that metal corrosion caused by moisture absorption of the matrix resin and the strength of the composite material product are reduced accordingly. Was. SUMMARY OF THE INVENTION The present invention has been made in view of the state of the prior art, and it has been made possible to easily and inexpensively inspect a fiber arrangement state and a fiber meandering state after a composite material part is formed. An object of the present invention is to provide a raw material (prepreg) and a method for producing a composite material component using the same.

[0004]

SUMMARY OF THE INVENTION The present invention is a material for molding a composite material comprising a reinforcing fiber and a matrix resin, wherein a tracer made of a hollow fibrous organic or inorganic material is formed in the same direction as the direction in which the reinforcing fibers are arranged. A composite material forming material characterized by being arranged and incorporated in a composite material forming method, wherein the composite material forming material is laminated according to the shape of the product, and heated and cured. is there.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The prepreg of the present invention is a method in which a tracer made of a hollow fibrous organic or inorganic material is converted into a reinforcing fiber in the form of a woven fabric, a sheet-like substrate, or a tow.
It is a material that is incorporated in the same direction as the arrangement direction of those fibers and is compounded with a matrix resin such as an epoxy resin. The prepreg is laminated according to the shape of the target product (composite material part) and irradiated with X-rays to the cured product by heating and pressing, so that the space of the hollow tracer is colored on the X-ray film. It can be seen as a line as the shading of the color, and the arrangement state and meandering state of the fibers in the product can be easily confirmed as the shading of the color. Glass fibers and carbon fibers are generally used as the reinforcing fibers, but ceramic fibers such as aramid fibers, boron fibers and silicon carbide fibers can also be used. In addition to the epoxy resin, a polyester resin, a phenol resin, a bismaleimide resin, a cyanate ester resin, and the like can be used as the matrix resin.

[0006] The material of the tracer used in the prepreg of the present invention includes molding and curing temperature of a composite material (usually 120 to
It can be used without any particular problem as long as it can withstand about 185 ° C.). However, glass fibers are generally used as an inorganic material in consideration of easiness of production and price, and further, polyphenylene sulfide (PPS) and polyorganic materials which are organic materials are used. A thermoplastic resin such as ether sulfone (PES) can also be used. The outer diameter and inner diameter (and wall thickness) when used as a tracer can be arbitrarily determined, but in the case of glass, the outer diameter is 0.1 to 0.3 mm and the wall thickness is from the viewpoint of prevention of breakage of hollow fibers during lamination. The thickness is preferably about 0.02 to 0.04 mm, and in the case of a thermoplastic resin, the outer diameter is 0.1 to 0.5.
mm and a thickness of about 0.02 to 0.1 mm are preferable. The method of incorporating these hollow fibers into the prepreg is not particularly limited.For example, when the reinforcing fiber is a woven fabric, it can be woven at the time of weaving as a warp of the woven fabric, and in the case of a unidirectional sheet material or tow. Can be incorporated into the material by supplying it simultaneously with the yarn during prepreg production.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described more specifically below with reference to the drawings. FIG. 1 is an explanatory view showing one embodiment of a prepreg of the present invention. FIG. 1 (a) is a schematic perspective view, and FIG. 1 (b) is an enlarged view of a portion C in FIG. 1 (a). In this example, a thin hollow fiber tracer 2 (hollow glass fiber having an outer diameter of 0.3 mm and a wall thickness of 0.03 mm) is laid on a sheet-shaped prepreg 1 having a unidirectional reinforcing fiber form in the same direction as the reinforcing fiber arrangement direction. It has been incorporated. The prepreg 1 used here uses epoxy resin as a matrix resin and carbon fiber as a reinforcing fiber, and has a resin content of 37%.
It is a prepreg having a thickness of 0.6 mm and a thickness of about 43% by weight.

FIG. 2 is an explanatory view of a composite material part 3 obtained by laminating two prepregs each incorporating the above-mentioned hollow tracer at right angles and heating and hardening them by an autoclave or the like.
FIG. 2A is a structural view, and FIG. Hollow tracers 2 are arranged in the cured composite material component 3 in the direction of the laminated reinforcing fibers.

Next, when this composite material part 3 is irradiated with X-rays 4 as shown in FIG. 3, the difference in density between the composite material part 3 and the hollow tracer 2 causes the part of the tracer 2 to be shaded in color. Since the image is projected on the X-ray film 5 in the form of a line 6, the internal fiber arrangement state and the fiber meandering state can be detected and confirmed.

FIG. 1 shows an example in which a hollow tracer 2 is incorporated into a prepreg having a sheet-like reinforcing fiber form.
As shown in FIG. 4, the prepreg 7 having a tow-like reinforcing fiber form
The prepreg of the present invention can be obtained by incorporating a hollow tracer 2 in parallel with the reinforcing fiber 12. 4 (a) is a schematic perspective view, FIG. 4 (b) is an enlarged view of a portion D in FIG. 4 (a), and FIG. 4 (c) is a cross-sectional view along AA in FIG. 4 (b). FIG. 5 is an explanatory view of a wrap-around-lag-shaped composite material part (filament-wound product) using the prepreg, and FIG. 5 (a) is a perspective view showing an overall image.
5 (b) is a horizontal sectional view thereof, and FIG. 5 (c) is A in FIG. 5 (b).
FIG. 5 (d) is a detailed view of a portion E in FIG. 5 (c). If the prepreg is applied to the wrap-around-lag-shaped composite material part 8 as shown in FIG. 5, the fiber meandering state of the winding part 9 can be confirmed by X-ray.

[0011]

By using the composite material forming material (prepreg) of the present invention, the fiber meandering of the fiber winding portion has an influence on the strength of the fiber arrangement part or the wrap-around rug part. An internal quality inspection can be performed on the component by X-ray irradiation, and the internal fiber arrangement state and the fiber meandering state can be easily confirmed, and the quality can be guaranteed. According to the production method of the present invention,
Quality inspection of the obtained composite material part becomes easy, and a product of good quality can be supplied.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a first embodiment of a prepreg of the present invention.

FIG. 2 is an explanatory view of a composite material part obtained by laminating two prepregs each incorporating the hollow tracer of FIG. 1 and heating and curing the prepregs.

FIG. 3 is an explanatory diagram showing a state of an X-ray irradiation test on the composite material part of FIG. 2;

FIG. 4 is an explanatory view showing a second embodiment of the prepreg of the present invention.

5 is an explanatory view of a wrap-around-lag-shaped composite material part using a prepreg incorporating the hollow tracer of FIG. 4;

FIG. 6 is an explanatory view showing an example of a prepreg incorporating a tracer according to the related art.

Claims (2)

[Claims] 1. A composite material molding material comprising a reinforcing fiber and a matrix resin, wherein a tracer made of a hollow fibrous organic or inorganic material is arranged and incorporated in the same direction as the reinforcing fiber. A material for molding a composite material, comprising: 2. A method for manufacturing a composite material component, comprising laminating the composite material molding material according to claim 1 according to the shape of a product, and heating and curing the material.