JP2007015187A - Frp molding - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the following problem: in the joining between an FRP molding and a metal, joining strength has been improved so far by applying knurling to the outer surface of the metal or by a molding method; however, for example, when a metal structure is joined, the joining strength has been often insufficient. <P>SOLUTION: In the FRP molding, the FRP molding is formed by a joining end part 2 in which an embedding body such as a steel sheet 2c and a fiber reinforcement 2d such as carbon fibers with the hole opening 2e of the embedding body placed by penetrating from one side to the other side are integrated/joined with/to a skin part 2a by impregnation with a resin and an FRP molding part. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an FRP molded product, and particularly to an FRP molded product in which a metal or the like is joined as a joining end portion.

When joining small metal parts such as bolts, nuts, rods, washers, coils, metal sheets, etc. to the FRP, it is necessary to embed them in the FRP during molding by insert molding. And knurled grooves are formed on the outside of the bolts and nuts, and the insert part is strongly fixed inside the FRP molded product.
Moreover, in order to join FRP and metal, examples of joining by an adhesive and joining by overlay are described. (For example, refer nonpatent literature 1.)
Hideaki Kasano, “Introduction to FRP that can be used by anyone”, Reinforced Plastics Association, September 12, 2002, p. 35, 97, 98 Although not disclosed at the time of filing, there is Japanese Patent Application No. 2004-15374 as a related prior application.

According to Non-Patent Document 1 described above, knurling is performed on the outer surface of the metal, or the bonding strength between the FRP molded product and the metal is improved by insert molding or overlay bonding. Are often required to further increase the bonding strength.
An object of the present invention is to obtain a molded product of FRP having a joint end portion made of metal or the like and strongly joining the joint end portion.

  The FRP molded product of the present invention includes an FRP molded part in which a core part formed by impregnating a core material with a resin is formed inside, and both outer sides of the core material part are covered with a skin part formed by impregnating a fiber reinforcing material with a resin. And continuously provided at the end of the FRP molded part, covering both outer sides of the embedded part having the embedded body on the side of the FRP molded part in the same skin as a sandwich, and on the side opposite to the FRP molded part side of the embedded part An FRP molded article having a joint end formed by extending the embedded body out of the skin portion, and the embedded portion covered in a sandwich shape with the skin portion, the embedded body and the opening of the embedded body from one side A fiber reinforcing material penetrating the other side is integrally formed by resin impregnation.

  Moreover, the FRP molded product of the present invention is obtained by joining a metal structure to an embedded body that has come out of the skin portion of the joining end.

  In the FRP molded product of the present invention, the other end side of the joint end portion of the embedded body provided with the metal structure on one end side is covered in a sandwich shape with the skin portion of the joint end portion, and the metal structure is joined to the joint end. It is connected to the FRP molded part by the part.

  Further, in the FRP molded product of the present invention, the embedded body covered with the skin part is provided with a fiber reinforcing material penetrating through the opening and provided with irregularities on the surface on the skin part side.

  In the FRP molded product of the present invention, the opening of the embedded body is a tapered hole having a small hole size at the center in the through direction of the opening and a large hole size on both outer sides. is there.

  In the FRP molded product of the present invention, the embedded portion covered in a sandwich shape with the outer skin portion is formed by impregnating the embedded body and the fiber reinforcing material installed through the opening of the embedded body from one side to the other side by resin impregnation. Since it is integrally formed, the joint between the skin part and the embedded body at the time of FRP molding, in addition to the joint between both interfaces by the impregnating resin, the fiber reinforcing material and the skin that are joined to the embedded body by the impregnating resin by opening or the like Reinforced by joining with the part, it becomes strong. That is, the bonding between the embedded portion forming the bonding end portion and the skin portion is strong. Moreover, since the skin part which forms the FRP molding part and the skin part which forms the joint end part are the same continuous skin part, it has a joint end part such as metal, and the joint end part is strongly joined. A molded product of FRP can be obtained.

  In addition, since the FRP molded product of the present invention is obtained by joining a metal structure to an embedded body that has come out of the outer skin portion of the joining end, the metal structure can be joined to the embedded body outside the skin by welding, screwing, An FRP molded product in which the metal structure is strongly bonded by the bonded end can be obtained.

  In the FRP molded product of the present invention, the other end side of the joint end portion of the embedded body provided with the metal structure on one end side is covered in a sandwich shape with the skin portion of the joint end portion, and the metal structure is joined to the joint end. Since it was joined to the FRP molded part by the part, it is possible to obtain an FRP molded product in which the metal structures are joined simultaneously by FRP molding.

  Further, in the FRP molded product of the present invention, the embedded body covered with the skin part is provided with the fiber reinforcing material penetrating through the opening and provided with irregularities on the surface of the skin part side. Bonding with the part is further strengthened.

  Further, in the FRP molded product of the present invention, the opening of the embedded body is a tapered hole having a small hole size at the center in the through direction of the opening and a large hole size on both outer sides. It is possible to smoothly apply the stress to the fiber reinforcing material penetrating the opening.

Embodiment 1 FIG.
FIG. 1 is a cross-sectional view illustrating an outline of an FRP molded product having a joint end portion according to Embodiment 1, and FIG. 2 is a cross-sectional view illustrating a configuration of the FRP molded product having the joint end portion of FIG. 3 is a perspective view showing the structure of the embedded portion of the joint end portion of the FRP molded product of FIG. 2, FIG. 4 is a perspective view showing a modified example of the embedded portion, and FIG. It is a perspective view which shows another modification.

As shown in FIG. 1, the FRP molded product is composed of an FRP molded portion 1 that is a substantially plate-like body, and a joining end portion 2 that is also a substantially plate-like body that is continuously formed at one end thereof.
The FRP molded part 1 is formed by arranging a skin part 1a on both outer surfaces of an inner core part 1b and sandwiching the core part 1b between the skin parts 1a, and a joining end part 2 is a steel plate 2c which is an embedded body. The embedded part 2b of the embedded part 2b is covered with a skin part 2a on both outer sides of the FRP molded part 1 side, and the embedded part opposite to the FRP molded part 1 of the embedded part 2b is formed outside the skin part 2a. is there. Here, the skin portion 1a and the skin portion 2a are the same skin portion formed continuously, and both end portions of the core material portion 1b and the embedded portion 2b are continuously arranged inside and sandwiched respectively. The joining end 2 is formed at the end of the FRP molded product. As shown in FIG. 1, generally, the thickness of the core part 1b of the FRP molded part 1 is larger than the thickness of the embedded part 2b of the joint end part 2, and the FRP molded product is tapered from the FRP molded part 1 to the joint end part 2. The thickness becomes smaller.

The configuration of the FRP molded part 1 and the joining end part 2 will be described in detail with reference to FIGS.
The skin portion 1a of the FRP molded portion 1 is an FRP molded body in which a fiber reinforcing material 2d such as carbon fiber is impregnated with an impregnating resin, and the inner core material portion 1b is an impregnated resin impregnated with a core material such as polyurethane. is there. The skin portion 1a and the core material portion 1b are integrally joined by an impregnating resin.

  The skin portion 2a of the joining end portion 2 is the same as the skin portion 1a of the FRP molded portion 1 as described above. The embedded portion 2b is formed from a steel plate 2c connecting the end to the end of the core portion 1b inside the FRP molded portion 1 and one side of an opening 2e penetrating a plate surface appropriately provided in the steel plate 2c. It consists of what integrated with fiber impregnating resin 2d, such as carbon fiber installed through the opening 2e to the other side. The skin portion 2a and the embedded portion 2b are integrally joined by an impregnating resin. One or more openings 2e are provided in an appropriate number, but it is desirable that a plurality of openings 2e are provided and the fiber reinforcing material 2d is penetrated in each of the two because the bonding strength increases.

  Thus, in the FRP molded product having the main joining end 2, the steel plate 2c of the joining end 2 is bonded to the same skin 2a as the skin 1a of the FRP molding 1 by the impregnating resin, Since the fiber reinforcement 2d that is installed through the opening 2e and is bonded to the steel plate 2c by the opening 2e by the impregnating resin is bonded to the skin portion 2a by the impregnating resin, the embedded portion 2b that forms the joint end 2 is It is firmly bonded to the same skin portion 2a as the skin portion 1a. Therefore, the connection of the joining end portion 2 to the FRP molded portion 1 becomes strong. That is, it is possible to obtain a molded product of FRP in which the joining end portion 2 is strongly joined.

Next, the manufacturing method manufactured by vacuum impregnation molding of the FRP molded product having such a joining end portion 2 will be described.
The vacuum impregnation molding apparatus includes a resin injection means, a deaeration means, a molding die on which the fiber reinforcing material 2d and a core material are placed, and a resin is injected by the resin injection means, and a fiber reinforcing material placed on the molding die. A known film having a vacuum film covering 2d and a placed object such as a core material and a sealing means for sealing the molded portion from the outside with a vacuum film at the periphery of the mold is used.
First, a sheet-like carbon fiber, which is a fiber reinforcing material 2d for forming the lower skin portions 1a and 2a, is cut and placed in a mold according to the size and shape.
On top of that, a polyurethane core material having a predetermined shape, which is a core material forming the FRP molding portion 1, and the embedded portion 2b are placed. As shown in FIG. 2, the embedded portion 2b is a steel plate 2c and a sheet-like carbon fiber that penetrates the hole 2e and is disposed on the surface of the steel plate 2c.
Next, a sheet-like carbon fiber, which is a fiber reinforcing material 2d forming the upper skin portions 1a and 2a, is cut and placed according to the size and shape.
Then, these placed objects are covered with a vacuum film, and the periphery is sealed, and then molded under normal conditions by vacuum degassing, resin injection impregnation, and press-cure curing to obtain an integral molded product.
In the vacuum impregnation forming described above, as shown in FIG. 1, the end of the steel plate 2c of the embedded portion 2b goes out of the forming die and is not joined to the skin portion 2a.

  In addition, the molding method for obtaining the FRP molded product is not limited to the manufacturing method by the above-described vacuum impregnation molding, but is laminated and cured while supplying sheet-like carbon fibers and the impregnating resin on a core material such as polyurethane, and the like. You may shape | mold by what is called a hand-molding method which obtains this molded object.

The FRP molded product having the joining end portion 2 formed in this way can be joined to the metal structure by welding, bolting, or the like by the end portion of the steel plate 2c that is not joined to the skin portion 2a and goes outside.
Further, in the FRP molded product having the joint end 2, the side that is not joined to the skin portion 2 a of the steel plate 2 c of the embedded portion 2 b is a metal structure, and the FRP molded product and the metal structure are directly joined by the joint end 2. You can also.

As the fiber reinforcement 2d, in addition to carbon fibers, woven fabrics such as glass fibers and aramid fibers, mats, and the like are used.
In addition to polyurethane, polystyrene, polyethylene, polypropylene, silicon, polyvinyl chloride, wood (such as balsa material), and the like are used as the core material.
The injection resin is a matrix resin for the molded product, and a thermosetting resin such as an epoxy resin, a vinyl ester resin, or an unsaturated polyester resin is used.
The embedded body may be a metal plate such as an aluminum plate in addition to the steel plate 2c, and welding or the like can be facilitated by using the same type of metal as the metal structure to be joined. Moreover, you may couple | bond with a bolt stop as a wood board.
As the skin portions 1a and 2a, in addition to the integral molding using the fiber reinforcing material 2d, an FRP molded body in which the fiber reinforcing material 2d is pre-impregnated and molded in a separate process may be used.

In FIG. 2 and FIG. 3, the embedded portion 2b has the fiber reinforcing material 2d penetrating through the opening 2e from one side of the opening 2e to the other side. However, as shown in FIG. Two openings 2e are used, the first opening 2e is penetrated from one side to the other side, and the second opening 2e is further penetrated from the other side to the one side. Also good. Further, as shown in FIG. 5, the opening of the adjacent first opening 2e in FIG. 4 is enlarged to form one opening 2e obtained by expanding the two openings 2e. Similarly, 2e may be an enlarged opening 2e, and a wide sheet-like carbon fiber may be penetrated from one side of the opening 2e to the other side. In short, to bond the steel plate 2c to the skin portion 2a, the fiber reinforcing material 2d such as carbon fiber is passed through the through hole 2e, and the fiber reinforcing material 2d is bonded to the steel plate 2c with the impregnating resin filled in the through hole 2e. The portion of the fiber reinforcing material 2d on the surface of the steel plate 2c is bonded to the skin portion 2a by the impregnating resin, thereby reinforcing the connection between the steel plate 2c and the skin portion 2a. Since the fiber reinforcing material 2d such as carbon fiber is the same material constituting the skin portion 2a, it becomes a strong bond with the impregnating resin.
Further, the direction of the fiber reinforcing material 2d penetrating the opening 2e is not limited to the joining direction as shown in FIG. 2, and it is desirable to select the direction in consideration of the direction of the load.

Embodiment 2. FIG.
FIG. 6 is a view showing an FRP molded product having the joining end portion 2 of the present embodiment, FIG. 6 (a) is a schematic cross-sectional view thereof, and FIGS. 6 (b) and 6 (c) It is a perspective view which shows the steel plate which forms each different embedding part.
The steel plate 2c of the embedding part 2b of the FRP molded product according to the present embodiment is a mesh-like steel plate 2f in which the surface and / or the back surface of the steel plate 2b is subjected to mesh processing without providing the opening 2e, or corrugated processing. The applied corrugated steel sheet 2g. Instead of reinforcing the joining of the steel plate 2c with the fiber reinforcing material 2d penetrating the opening 2e as in the FRP molded product of the first embodiment, by using the mesh steel plate 2f or the corrugated steel plate 2g, The bonding area is increased to increase the bonding strength. Other structures and the like are the same as those of the FRP molded product having the joining end portion 2 of the first embodiment. In addition, the same effect can be acquired by providing an unevenness | corrugation not only to carrying out a net-like process or a waveform process on the surface and / or back surface of the steel plate 2c.

  The FRP molded product having the main joining end portion 2 is provided with irregularities such as a mesh steel plate 2f and a corrugated steel plate 2g, and further provided with an opening 2e, and is made of a fiber reinforcing material 2d as in the embedded portion 2b of the first embodiment. If the joint is reinforced, a stronger joint can be obtained.

Embodiment 3 FIG.
FIG. 7 is a cross-sectional view showing an FRP molded product having a joining end portion according to the third embodiment. This FRP molded product is provided with an opening 2e in the same manner as the steel plate 2c of the embedding part 2b of the first embodiment. However, as shown in FIG. 7, the size of the hole in the central part in the penetration direction of the opening 2e is reduced. Then, the opening 2e is tapered in the penetrating direction so that the front and back sides are enlarged. In this way, the state of stress applied to the fiber reinforcement 2d penetrating the opening 2e can be made smooth, the durability of the fiber reinforcement 2d can be improved, and deterioration of the bonding strength can be prevented. Other structures are the same as those in the first embodiment. The same applies to the case where the opening 2e is provided in the steel plates 2f, 2g, etc. of the FRP molded product of the second embodiment.

The FRP molded product of the present invention can be joined to the metal structure via the joining end 2.
Moreover, the FRP molding of this invention can obtain the FRP molding which couple | bonded the metal structure to the joining edge part simultaneously with FRP shaping | molding by using the embedded body which provided the metal structure in the one end side.

It is sectional drawing which shows the outline of the FRP molded product of Embodiment 1 of this invention. It is sectional drawing which shows the structure of the FRP molded product of FIG. It is a perspective view which shows the structure of the embedding part of the joining edge part of the FRP molding of FIG. It is a perspective view which shows the modification of the embedding part of the joining edge part of the FRP molding of FIG. It is a perspective view which shows another modification of the embedding part of the joining edge part of the FRP molding of FIG. It is a figure which shows the FRP molded product of Embodiment 2 of this invention. It is sectional drawing which shows the FRP molded product of Embodiment 3 of this invention.

Explanation of symbols

1 FRP molding part, 1a skin part (skin part of FRP molding part), 1b core material part, 2 joint end part, 2a skin part (skin part of joint end part), 2b embedding part, 2c embedding body, 2d fiber reinforcing material 2e Open hole, 2h Tapered hole.

Claims (5)

A core part formed by impregnating a core material with a resin, and an FRP molded part in which both outer sides of the core part are covered with a skin formed by impregnating a fiber reinforcing material with a resin; and an end of the FRP molded part The FRP molded part side outside of the embedded part having an embedded body such as a steel plate is continuously covered with the skin part in the form of a sandwich, and on the opposite side of the embedded part to the FRP molded part side. In the FRP molded article provided with a joint end formed by extending the embedded body out of the skin part,
The embedded portion covered in a sandwich shape with the skin portion is formed by integrally impregnating the embedded body and a fiber reinforcing material installed through the opening of the embedded body from one side to the other side by resin impregnation. FRP molded product characterized by that.   2. The FRP molded product according to claim 1, wherein a metal structure is joined to the embedded body that has come out of the skin portion of the joining end portion. 3.   The other end side of the embedded body provided with a metal structure on one end side is covered with the skin portion of the joint end portion in a sandwich shape, and the metal structure is joined to the FRP molded portion by the joint end portion. The FRP molded product according to claim 1, wherein   4. The FRP molded product according to claim 1, wherein unevenness is provided on a surface on the skin portion side of the embedded body covered with the skin portion. 5. The opening of the embedded body is a tapered hole having a small hole size at a central portion in a through direction of the opening and a large hole size on both outer sides. The FRP molded product according to claim 3.

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