JPS62196123A - Connection of fiber reinforced plastic constructional members - Google Patents

Abstract

PURPOSE:To easily construct a highly rigid structure and manufacture it at low cost by a method wherein the structure that the joining position produced by joining the bore- contracted parts of base materials of which is covered with a joint made of perforated lightweight metal plate is inserted in a mold and impregnated with resin to be cured finally. CONSTITUTION:Base materials 4 covered with braidings 2 and having bore-contracted parts 9 provided at a central part or an end, at which the joining of bar-shaped core materials 1 is necessary, are prepared so as to combine the predetermined bore-contracted parts 9 provided on the base materials 4 into a necessary form at a portion combined, for example, in a T-shape. Next, a joint 8 which is formed so as to fit to above-mentioned combined portion is stretched so as to fit onto the bore-contracted parts 9 of the base materials at the combined portion in order to make the bore-contracted parts 9 and the joint 8 into an integral body by caulking. After the integration of the base materials and the joint, the base materials are assembled in a molding tool so as to pour synthetic resin such as epoxy resin or the like under pressure after the tool is evacuated. The synthetic resin permeates the core materials 1 by passing through the holes 10, for example, of a punching metal and the braidings 2 in the joint. Next, by heating, the synthetic resin is cured integrally with the core materials 1. In addition, the respective core materials 1 together with the braidings 2 are hardened by being impregnated with the resin. Thus, a lightweight and highly rigid FRP structure is manufactured.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention relates to a method for connecting lightweight structures by joining, laminating, and integrating structural members made of fiber reinforced plastic (hereinafter referred to as F'RP). .

[Conventional technology]

Fig. 4 is a perspective view showing the state of joining of conventional structural members. The rod-shaped core material (2) thus formed is a braided body made of unidirectional fibers such as glass fibers coated on the outside of the core material (1). (3) is a base material in which this braided body (2) is covered with a rod-shaped core material (1), (4) is a cloth made by braiding unidirectional fibers, which are joined at the reduced diameter part of the base material (3), This joint area is coated.

Conventionally, the reduced diameter portions of the base material (3) whose cross-sectional area has been reduced are joined together as described above, and the joined portion is covered with a cloth (4) as shown in Fig. 4 for integration, and then epoxy is applied. The structure was constructed by impregnating it with synthetic resin such as resin, curing it under pressure and heating, and integrating it.

Alternatively, as shown in Fig. 5, a plurality of molded laminates (5
) were joined, then a connecting fitting (6) made of plastic such as 5M0 (sheet molding compound) was placed over the connecting fittings (6) and fixed with screws (7) etc. to construct a structure.

[Problem that the invention seeks to solve]

Conventional connection method 2 as described above For example, in the method shown in Fig. 4, the reduced diameter part of the base material (4) covered with the braided body (2) is joined, and after covering the cloth (3), impregnating it with synthetic resin. Since the cloth (3) is hardened, it takes time and effort to cover the cloth (3), and expensive waste is used, resulting in a high price.

The method shown in FIG. 5 requires high strength, which results in a problem that the size of the connecting fitting becomes large and the cost of the connecting fitting itself becomes high.

This invention was made to solve these problems, and aims to provide a connection method that is suitable for mass production and does not increase weight.

[Means for Solving the Problems] The connection method according to the present invention involves forming a braided body made of unidirectional fibers on the outer periphery of a rod-shaped core material in which a reduced diameter part with a reduced cross-sectional area is formed at the end or middle part. coated as a base material, and at least 2
The reduced diameter portions of the intermediate or end portions of two or more base materials are joined to each other, and a joint made of a perforated lightweight metal plate is coated on this joint portion, and a synthetic resin is applied to the joint portion of the base material coated with this joint. This is a method for connecting fiber-reinforced plastic structural members that are impregnated and cured to be integrated.

[Effect]

In this invention, a joint made of a perforated lightweight metal plate is coated on the joining part where the diameter reduction of the base material is joined, and then inserted into a mold, impregnated with synthetic resin and hardened, so that the resin is braided from the perforated part. It reaches the core material through the body, heats and hardens, and the core braid and joint are integrated, making it easy to connect as a lightweight, high-strength structure.

〔Example〕

An embodiment of the method for connecting structural members according to the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a joint of a structure according to an embodiment of the present invention, FIG. 2 is a perspective view showing an intermediate state at the joint, and FIG. 3 is a perforated lightweight metal plate 2 used for joining. FIG. 2 is a perspective view showing a joint made of punched aluminum metal, for example.

In these figures 1 and 2, (1), 12+,
(4) is the same as the conventional example. (8) is a perforated lightweight metal plate.

For example, it is a joint made from punched aluminum metal. (9) is the shape of the base material (3) that is joined to each other at the reduced diameter part of the base material (3) and the joint (8) that is covered after joining.
) The cross-sectional area is reduced at the ends or center of the core material (1) to match the shape of the core material (1).

The fins are holes in a perforated lightweight metal plate, such as aluminum punched metal, used for this joint (8).

Next, to explain the manufacturing method, when assembling a lightweight, highly rigid structure, a reduced diameter part (9) is installed at the center or at the end of the rod-shaped core material (11) that requires connection. (2
) is prepared, and in the connection part 9 of the structure, for example, in the part combined in a figure 7 shape, a predetermined reduced diameter part (9) thrown on the base material (4) is formed into the required shape 2. For example, they are combined into the shape shown in FIG.

Next, open the joint (8) made to match the shape of this combined part, fit it into the reduced diameter part (9) of the base material (4) in the two combined parts, and fix it as an integral part as shown in Figure 1. do. It is assembled into an integral diameter mold (not shown), and after vacuuming, a synthetic resin such as epoxy resin is press-fitted from a resin injection device (not shown).

This synthetic resin enters the hole α1 of the material 2 of the joint (8), for example, punched metal, passes through the internal braided body (2), and passes through the core material (
Impregnate up to 1). Then by heating the fitting (8)
is hardened and integrated with the core material (1) through the braided body (2), and each core material (1) is impregnated and hardened with the braided body (2), thereby producing a lightweight and highly rigid FRP structure. Ru. Also, joints made of punched metal such as aluminum (7
) can be used to form lightweight and highly rigid joints. Similar effects can be expected with joints using thin rolled steel plates other than aluminum miniram.

〔Effect of the invention〕

In addition to the above, the present invention comprises a rod-shaped core material in which a diameter-reduced portion with a total cross-sectional area is formed at the end or middle portion, and a braided body made of unidirectional fibers is coated on the outer periphery of the rod-shaped core material to serve as a base material. The reduced diameter portions of two or more base materials are joined to each other, and a joint made of a perforated lightweight metal plate is coated on this joint portion, and the joint portion of the base materials coated with this joint is covered with a joint made of a perforated lightweight metal plate. This method of connecting structural members made of fiber-reinforced plastic is made by impregnating and curing synthetic resin and integrating them, which has the effect of easily constructing a highly rigid structure.

Furthermore, by using a joint made from a commercially available lightweight perforated metal plate, it is possible to manufacture the joint at low cost with fewer manufacturing steps.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a molded state for explaining a connection method according to an embodiment of the present invention, and FIG. 2 is an external perspective view showing an intermediate state of the connection method according to an embodiment. Further, FIG. 3 shows a fishing rod and a joint according to an embodiment of the present invention.
- (This is a perspective view. Fig. 4 is a perspective view showing a joined state of a structure according to a conventional example, and Fig. 5 is a perspective view showing a joined state of a structure according to another conventional example. In the figure (1) is a core material, (2) is a braided body, (4) is a base material, (8) is a joint, +9) Vi is a reduced diameter part, and αq is a hole. The same reference numerals in each figure indicate the same or corresponding parts.

Claims (2)

[Claims] (1) The outer periphery of a rod-shaped core material in which a reduced diameter part with a reduced cross-sectional area is formed at the end or middle part is coated with a braided body made of unidirectional fibers, and at least two or more base materials are used. The reduced diameter portions of the intermediate or end portions are joined to each other, a joint made of a perforated lightweight metal plate is coated on this joint part, and a synthetic resin is impregnated and hardened in the joint part of the base material coated with this joint. A method for connecting structural members made of fiber-reinforced plastic, characterized in that they are integrated together. (2) The method for connecting fiber-reinforced plastic structural members according to claim 1, characterized in that the perforated lightweight metal plate is a punched metal made of an aluminum plate or a rolled thin steel plate.