JP2002361666A - FRP laminate and molding method of FRP - Google Patents

Abstract

(57) [Problem] To provide a portion provided with a reinforcing plate for reinforcing the vicinity of a through hole of a fastener or the like so that excess resin and air can be discharged to the outside during molding. A reinforcing plate (2) is provided with a space such as a through hole (8) extending through each reinforcing plate (2) and a groove communicating with the outside of the reinforcing material on a surface of the reinforcing plate (2) which is in contact with the CFRP material (1). Excess resin and air on the surface in contact with the CFRP material 1 are discharged to the outside to improve the performance of the FRP molded product.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an FRP (fiber reinforced plastic) molding technique, and more particularly to a technique for improving molding quality at a reinforcing portion.

[0002]

2. Description of the Related Art Generally, an FRP is formed by laminating a high-strength fiber such as glass fiber or carbon fiber impregnated with an epoxy resin or the like and an FRP material composed of a resin.
Excess resin component is removed from RP material by vacuum suction, etc.
Thereafter, it is obtained by performing high-temperature and high-pressure curing and molding.
By combining such fibers and fiber layers with resin, the FRP in any form can be used for various types of aerospace equipment and everyday products due to its light weight, high rigidity, high strength or high weather resistance. Used in a wide range of fields.

[0003] Basically, FRP can obtain a three-dimensional molded product by laminating a fiber layer and solidifying it with a synthetic resin. Further, since the size of the molded product to be produced is also formed by laminating the fiber layers, even a large-scale product can be theoretically produced integrally. In actuality, molding is performed by dividing into a certain size due to the limitation of the production space and the like, but a large-scale structure can be obtained by joining the molded FRPs.

On the other hand, even in a small-scale FRP molded product,
In many cases, coupling with other members such as joining of FRP and FRP or joining of FRP and metal frame is required in the manufacturing process.

[0005] In joining such molded FRPs and joining with other members, or joining the molded FRP molded material with other FRP molded materials, the members and members are joined by welding or the like like metal materials. A method of fusing and connecting cannot be adopted, and is generally bonded by a method such as bonding with an adhesive or a bolt or rivet bonding.

At the time of the above-mentioned bolt joining or rivet joining, it is necessary to provide through holes for fasteners such as bolts and rivets at joining points in the FRP molded product. Generally, members to be joined are overlapped. Then, a fastener is inserted into this hole to be fastened.

However, FRP has high strength and rigidity, but also has brittleness. Therefore, when a fastener such as a bolt is inserted into the through hole and the fastener is tightened, the degree of stress concentration is higher than that of metal due to fragility, and strength lower than that of metal may be obtained. .

Therefore, in order to reinforce the portion provided with the through holes for fastening as described above, when laminating the FRP material which is a fiber layer impregnated with resin, as a reinforcing material around the place where the through holes are provided. This reinforcing material may be laminated between FRP materials in order to arrange a metal plate or the like.

In this manner, the brittleness of the FRP can be compensated for, and the strength of the FRP molded product through which the fastener has been passed can be improved around the through hole.

[0010]

As described above, the brittleness of FRP can be improved by inserting the above-mentioned metal plate or the like between the FRP materials when the reinforcing material is laminated,
Due to the presence of the reinforcing material, the synthetic resin at the location where the reinforcing material is inserted and the air sealed between the reinforcing materials may not be sufficiently discharged to the outside during FRP molding.

In general, in FRP, a high-quality FRP can be obtained by reducing the proportion of the resin in the unit volume in the molding step. Therefore, vacuum suction is applied to the laminated FRP material to remove excess resin and the like to the outside. To be discharged.

However, as shown in FIG.
Is present, the excess resin at the location where the reinforcing material 50 exists is not sufficiently suctioned and discharged, and after the suction, a resin pool due to the surplus resin and air bubbles 51 are formed when air is not discharged. Therefore, there is a possibility that the molded product 52 becomes a low-quality one having an uneven thickness and the like.

[0013] The present invention has been made in view of the above-mentioned problems, and a surplus resin and air are discharged to the outside from an FRP material sandwiched between reinforcing members to obtain an FRP molded body without deterioration in quality. This is a technical issue.

[0014]

In order to solve the above problems, the present invention has the following arrangement. That is, an FRP laminated body formed by laminating a plurality of FRP materials and having a reinforcing portion in which a reinforcing material is laminated together with the FRP material at least in part, and a surplus surface of the reinforcing material in contact with the FRP material during molding is formed. A space for discharging resin and air is provided. Therefore, during molding, surplus resin and air are discharged from this space to the outside of the FRP material. By using such an FRP laminate, it is possible to obtain a high-density FRP molded article having no excess resin or air discharged to the outside and no bubbles inside.

[0015] As a space provided in the reinforcing member, for example, a through-hole may be formed, and surplus resin and air may be discharged to the outside from the through-hole.

Alternatively, a groove may be provided in the reinforcing member as a space, and the groove may be used to discharge excess resin and air to the outside.

When a through hole is formed in the reinforcing material,
A hole may be provided at a location where a fastener such as a bolt is to be attached later, or a reinforcing material such as a punching metal having a small hole formed in the entire reinforcing plate may be used. However, the former is more desirable if high strength is required.

In order to provide a groove in the reinforcing member, for example, a groove extending radially from the center of the reinforcing member to the end of the reinforcing member may be provided radially, or a lattice-shaped groove may be provided on the surface of the reinforcing member. it can.

The groove is provided so that a groove portion provided in the reinforcing material is thinner than other portions of the reinforcing material, or a part of the reinforcing material is bent into a groove shape to form the groove. be able to.

It is, of course, possible to provide both a through hole and a groove in the reinforcing material, and by combining these as needed, it is possible to discharge excess resin efficiently. .

According to the present invention, the reinforcing material and the FR
By providing a space between the P material and the P material, surplus resin and air in the reinforcing portion can be effectively discharged to the outside during molding of the FRP.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below. (Embodiment 1) As Embodiment 1, a circular metal plate having a through hole at the center is used as a reinforcing material, and FRP is used.
The case of performing lamination molding will be described with reference to the drawings.

As shown in FIG. 1A, carbon fibers are immersed in a resin to form a carbon fiber composite material (hereinafter referred to as a CFRP material) impregnated with the resin. A plurality of such CFRP materials 1 are laminated to obtain a CFRP molded product.
A through hole 8 is formed at the center between the layers in which a plurality of RP materials 1 are laminated.
Are arranged and laminated so that they are alternately positioned.

As described above, the FRP laminate S in which the sheet-like CFRP materials 1 and the reinforcing plates 2 are alternately laminated is obtained. Next, as shown in FIG.
Install inside. The opening of the mold 3 is covered with a bleeder 4 functioning as a resin absorbing paper, and a vinyl sheet 5 serving as a packing is further placed on the bleeder 4, and a suction port 6 is provided in the vinyl sheet 5.

A vacuum pump (not shown) is connected to the suction port 6 to perform suction, thereby bonding the respective layers while discharging the surplus epoxy resin 7 impregnated in the CFRP material.

During this suction, C contacting the reinforcing plate 2
The epoxy resin 7 contained in the FRP material 1 passes through the through hole 8 and is discharged to the outside of the CFRP material 1 without being accumulated inside. At this time, the surplus epoxy resin is discharged to the outside of the CFRP material 1 as shown by an arrow 7. Similarly, air existing between the reinforcing plate 2 and the CFRP material 1 is also CF
It is discharged outside the RP material 1.

In the state where the respective layers are integrated as described above, a CFRP laminate S composed of the CFRP material 1 and the reinforcing plate 2 is formed.
Is moved into a pressure cooker (not shown). In this pressure cooker, the mixture is cured under high temperature and high pressure, and as shown in FIG.
The CFRP molded article 9 in which the RP materials are combined and integrated is obtained.

In the present embodiment, the through-hole 8 is provided only in the center of the reinforcing plate 2, and this through-hole 8 can be used as a pilot hole when a fastener such as a bolt is later passed.

In this embodiment, the excess resin and air can be discharged at the time of molding, and the reinforcement is provided by the high-strength reinforcing plate 2 having no through-hole except in the required places.

Here, when laminating the CFRP material 1 and the reinforcing plate 2 shown in FIG. 1A, a through hole 8 smaller than the through hole of the fastener is previously set in the reinforcing plate 2 and the reinforcement is performed based on this. After laminating and forming the plate 2 and the like, it is desirable to form a larger through hole that includes the through hole 8 and that matches the size of the fastener. In this way, molding errors such as displacement of the through holes during lamination of the reinforcing plates 2 are absorbed, so that inconvenience of the product hardly occurs. . (Embodiment 2) Here, a case will be described in which a circular reinforcing plate 11 in which grooves 12 are formed radially outward from a central portion of a reinforcing member as shown in FIG.

As shown in FIGS. 3A and 3B, the reinforcing member 11 has a plurality of radially extending grooves 12 from the center of the reinforcing member 11 outward.

After the reinforcing plate 11 and the CFRP material 1 are alternately laminated as shown in FIG. 2, the excess resin is sucked into the mold 3 as in the case shown in FIG. 1B. At this time, the reinforcing plate 11 is formed by the groove 12 formed in the reinforcing plate 11.
The CFRP is formed while discharging the surplus resin of the CFRP material 1 in contact with and the air contained therein to the outside of the reinforcing plate 11.

When the reinforcing plate 11 is laminated with the CFRP material 1, when the grooves 12 of the reinforcing plate in contact with the upper and lower CFRP materials 1 overlap, the gap formed by the groove 12 is reduced. Therefore, it is preferable that the reinforcing plates 11 are alternately rotated and stacked so that the grooves 12 formed in the reinforcing plate 11 do not overlap.

Further, the reinforcing plates 2 are alternately rotated little by little and laminated, so that the convex portions 14 on the opposite surface of the concave portions 13 of the grooves 12 and the reinforcing plate 1 laminated on the convex portions 14 are formed.
When the planes of the CFRP material 1 and the CFRP material 1 overlap with each other, it is expected that a new gap is generated and resin and air are discharged.

In the present embodiment, excess resin and air can be discharged by a radial gap communicating from the center of the reinforcing plate 11 to the outside of the reinforcing plate 11.

In the case where it is problematic to increase the thickness of the laminated FRP product by forming a three-dimensional groove in the reinforcing material so as to be uneven, as shown in FIGS. 4 (a) and 4 (b). The circular reinforcing member 16 is provided with a slit 17 serving as a radial space, and from the space formed by the slit 17,
It is also possible to discharge surplus resin and air inside the reinforcing member 16 to the outside.

The reinforcing member 16 has a radial slit 17.
By providing grooves by CFRP, different materials CFRP
It can be expected that the joining between the material 1 and the reinforcing member 16 will have higher rigidity due to the anchoring effect of the slit 17. (Embodiment 3) Here, as shown in FIG.
The reinforcing member 21 having the shape 2 and the groove 23 will be described.

As shown in FIGS. 6 (a) and 6 (b), the reinforcing material has a groove 23a having irregularities extending radially from the central hole 22a in all directions, and a through hole 22b. That is, the groove 23a includes four grooves 23b provided in a tangential direction at quadrants of a diameter and four through holes 22b provided at the intersection of the grooves 23a and 23b.

In this embodiment, there is a possibility that the reinforcing members 21, 21... Laminated at the time of FRP molding are displaced and the through holes 22 of the individual reinforcing members 21 do not penetrate from the lower surface to the upper surface. Even if possible, the groove 2 provided in the reinforcing material 21
Excess resin and air are discharged outside from 3a and 23b.

In this embodiment, the through hole 2 at the center is
By providing the through holes 22b on all four sides in addition to 2a, it can be expected that the bonding rigidity as a composite material composed of different materials of the CFRP material 1 and the reinforcing material 21 can be increased.

Further, a through hole 27 is opened at the center with a reinforcing member 26 as shown in FIGS.
Is provided radially around the center, and it is possible to discharge excess resin and air through the groove 28 formed by the slit and the through hole 27.

As shown in FIGS. 8 and 9, the CFRP molded article 9 molded as described above is passed through a bolt hole 30 at the center thereof and then fastened by a bolt 31.

Although the bolts have been described as examples of the fasteners, the fasteners are not limited thereto. Further, the shape, size, and number of through-holes, grooves, and the like that form a space for discharging surplus resin and the like are not limited, and these can be appropriately selected and combined.

Further, the number, size and shape of the laminated FRP materials (prepregs) and reinforcing plates are not limited, and the number of reinforcing plates may be one or two or more.
In this case, the prepreg includes not only carbon fibers but also other fiber composite materials such as glass fibers and aramid fibers.

[0045]

As described above, according to the present invention, by using an FRP laminate having a space formed in a reinforcing portion of an FRP laminate in which a reinforcing material is laminated together with an FRP material, surplus resin and air can be removed during molding. Can be sufficiently discharged. Therefore, the quality of the FRP molded product can be improved.

[Brief description of the drawings]

1A and 1B are diagrams illustrating a process of forming an FRP according to a first embodiment, wherein FIG. 1A is a conceptual diagram of laminating a CFRP material and a reinforcing material, and FIG. 1B is a conceptual diagram of sucking and discharging a resin component from the laminated FRP. FIG. 3C is a cross-sectional view of the reinforcing laminate after the FRP is formed.

FIG. 2 is a conceptual diagram of laminating a CFRP material and a reinforcing material when a reinforcing material provided with a groove according to the second embodiment is used.

FIG. 3 is a diagram showing a reinforcing plate according to the second embodiment, and (a)
Is a plan view thereof, and (b) is a side view thereof.

FIG. 4 is a diagram showing a reinforcing plate according to the third embodiment, and (a)
Is a plan view thereof, and (b) is a side view thereof.

FIG. 5 shows a reinforcing member having a through hole and a groove according to the third embodiment and C
It is a conceptual diagram which laminates FRP material.

6A and 6B are diagrams showing a reinforcing material provided with a through hole and a groove, wherein FIG. 6A is a plan view thereof, and FIG. 6B is a side view thereof.

FIGS. 7A and 7B are diagrams showing a reinforcing member having a through hole and a groove formed by a flaw, in which FIG. 7A is a plan view and FIG. 7B is a side view.

FIG. 8 is a partial cross-sectional view of an FRP molded body provided with a bolt hole in a reinforcing portion.

FIG. 9 is a partial sectional view of an FRP molded body in which a bolt is attached to a reinforcing portion.

FIG. 10 is a partial cross-sectional view of a molded body in which surplus resin and air are not discharged from a reinforcing portion.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 CFRP material 2 Reinforcement plate 3 Mold 4 Bleeder (Resin absorbing paper) 5 Vinyl sheet 6 Suction port 7 Epoxy resin 8 Through hole 9 FRP composite material 11 Reinforcement plate 12 Radial groove 13 Concave 14 Convex 16 Reinforcement 17 Radial scratch Groove 21 Reinforcement 22 Through-hole 22a Central through-hole 22b Four-sided through-hole 23 Groove 23a Radial groove 23b Tangential groove 26 Reinforcement 27 Through-hole 28 Radial scratch groove 30 Bolt hole 31 Bolt 50 Reinforcement material 51 Air bubble 52 Molded product

Claims (7)

[Claims] 1. An FRP laminated body formed by laminating a plurality of FRP materials and having a reinforcing portion in which a reinforcing material is laminated together with an FRP material in at least a part thereof, wherein a surface of the reinforcing material in contact with the FRP material is provided. An FRP laminate having a space for discharging excess resin and air during molding. 2. The FRP laminate according to claim 1, wherein the space is a through hole provided in the reinforcing member. 3. The FRP laminate according to claim 1, wherein the space is a groove formed in the reinforcing member. 4. The FRP according to claim 1, wherein:
An FRP molded article formed using the laminate. 5. An FRP molding method in which a plurality of FRP materials are laminated to form an FRP molded product, a reinforcing material is laminated together with the FRP material, and the FRP material is integrally molded. A space for discharging surplus resin and air is provided, and surplus resin or air existing between the reinforcing material and the FRP material is discharged to the outside at the time of forming the FRP. 6. The method of claim 5, wherein the space is a through hole provided in a reinforcing material. 7. The space F is a groove formed in a reinforcing material.
RP molding method.