JPH06254968A - Junction of tubular object of fiber-reinforced resin - Google Patents

Abstract

PURPOSE:To cross-junction a tubular object of fiber-reinforced resin under various kinds of stress by adjusting a clearance between the outer surface of the tubular object and the inner surface of a junction metal, applying an adhesive to cure it under pressure and curing the boundary between the end of the junction metal and the tubular object by reinforcement. CONSTITUTION:The curvature of the outer surface of fiber-reinforced resin tubular objects 11, 12 and the inner surface of junction metals 21-a, 21-b as an adhesion surface is adjusted so that the clearance between these surfaces is 1mm max. Next, an adhesive is applied to an area between the tubular objects 11, 12 as objects to be junctioned and the junction metals 21-a, 21-b which are splittable as a junction part. Further, the adhesive is allowed to cure with a concurrent action to press the adhesion surface to make both object to be junctioned and the junction metal one piece. After that, the boundary between the end of the junction metal and the tubular object is cured by reinforcement using fiber-reinforced resin materials 33, 34, 35. Consequently, it is possible to reduce a stress level generated in the adhesion layer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for intersecting and joining fiber-reinforced resin pipes used for a structure of a transportation system. For example, the side burrs and lateral burrs that make up the bogie frame for railway vehicles and bogie frames for linear motor cars are made of fiber-reinforced resin pipes, and these are joined and assembled to produce a bogie frame that is lightweight. it can.

[0002]

2. Description of the Related Art Conventionally known methods for making a fiber-reinforced resin pipe body into a T-shape include, for example, a metal having an insertion opening slightly larger than the outer diameter of the fiber-reinforced resin pipe body to be joined. A metal integrated product is prepared, and a resin tube is applied to the insertion port with an adhesive and then inserted and joined.
However, with this method, it is impossible to apply pressure to the bond, and it is unavoidable that a bond failure occurs in the bond layer. Therefore, the joint strength was low compared to the strength of the article. .

Further, Japanese Utility Model Application Laid-Open No. 63-147397 has proposed a prismatic joint for connecting two carbon fiber reinforced plastic (CFRP) prisms in an L-shape. According to this, each prism end face is obliquely cut and joined, and the reinforcing member is arranged so as to straddle two prisms and joined by utilizing the fact that the surface of the prism is a flat surface. Since they are connected in an L-shape, the other prism cannot be joined at an arbitrary position on one prism. In addition, since the rigidity and strength are reduced because the prisms are cut out diagonally, reinforcement is required, but in the case of a tubular body having a curved surface without being configured only with a shape other than a prism, such as a cylindrical or elliptical flat surface. However, it has been impossible to use the reinforcing member using a flat surface.

[0004]

DISCLOSURE OF THE INVENTION The present invention has desired rigidity and strength under tension, compression, bending, twisting and shearing loads acting between two or more fiber-reinforced resin pipes. It is an object of the present invention to provide a method for crossing and joining fiber-reinforced resin pipes.

[0005]

According to the present invention, when two or more fiber-reinforced resin pipes are crossed and joined, the outer surface of the fiber-reinforced resin pipe to be joined is bonded to the bonding surface. Adjust the curvature of the inner and outer surfaces so that the gap between the inner surface of the metal fitting is within 1 mm, and use a split metal fitting with the joint formed, and apply an adhesive between the object and the metal fitting. ,
While pressing the adhesive surface to cure the adhesive and integrate the joined object and the joining metal fitting, after that, after reinforcing the boundary area between the end portion of the joining fitting and the fiber reinforced resin tubular body with the fiber reinforced resin material, A method for joining fiber-reinforced resin pipes is characterized in that the fiber-reinforced resin material is cured.

The present invention will be described below with reference to the drawings. FIG. 1 shows a perspective view in which two fiber-reinforced resin pipes 11 and 12 to be joined are made into a T shape and are bonded to each other by using two-piece joining metal fittings 21-a and 21-b. When the pipes are arranged at 45 degrees, the joint is viewed from above as shown in FIG. When the pipes 13, 14, 15, 16 are arranged in a + shape, the joint looks like FIG. 3 when viewed from the top, and the + shape pipe is composed of 3 pipes or 4 pipes. It may be composed of either of them, and it is also possible to join five or more tubular bodies.

Steel, titanium, aluminum or the like can be used as the material of the split metal fitting, and the metal material is aluminum in order to tighten the flange portion to reduce the gap with the pipe body to be joined. It is desirable that the material be as soft as possible.
Further, in order to effectively utilize the lightness of the fiber-reinforced resin tubular body, a material having a small specific gravity such as aluminum is preferable as the material. The plate thickness of the joint fitting is determined by the rigidity and strength required for the joint. It is desirable that the curvature of the inner surface of the joint fitting is substantially equal to the outer diameter curvature of the fiber-reinforced resin tube, but if the joint fitting is soft, it can be manufactured if the gap between them is within 1 mm. If the gap exceeds 1 mm, a defective adhesion portion may occur on the joint surface, resulting in deterioration of rigidity and strength. Further, it is necessary to make the joining metal fitting into the shape of the joining part. For example, in the case of T-shaped joining, the shape of the joining fitting is T-shaped, and in the case of + type joining, the shape of the joining fitting is + shape. You need to use a mold.

The fiber-reinforced resin tubular body to be joined is made by passing reinforcing fibers through a liquid resin and winding it around a metal cored bar.
The so-called filament winding method in which a metal cored bar is heated and then drawn out is most commonly known, but any forming method such as a sheet winding method or a pultrusion molding method may be used. When the fiber-reinforced resin tubular body which is the body to be joined is joined, the adhesive may be liquid or film-like. Further, the curing condition of the adhesive may be room temperature curing or heat curing, and the bonding method of the present invention is not limited to the curing condition of the adhesive.

FIG. 4 shows a sectional view including the flange of the joint fitting. As shown in Fig. 4, a gap is provided between the flanges on the mating surfaces of the joining metal fittings, and a through hole is formed in the crush vise 31 or the flat portion of the flange, and the flanges are tightened with bolts and nuts 32 etc. . The vise is removed after bonding, but the bolts and nuts may be removed or left fixed. Further, the gap between the flanges should be such that the flange mating surfaces do not interfere with each other when the flanges are tightened, and a gap of several mm is sufficient.

After the bonding, the fiber-reinforced resin material 33, 34, 35 is wound around the boundary region between the end portion of the split metal fitting and the fiber-reinforced resin pipe body 11, 12 as shown in FIG. . Examples of the reinforcing fiber of the raw material constituting the fiber-reinforced resin material include carbon fiber, glass fiber, and high-strength organic fiber such as aramid fiber, and these may be used in combination. A thermosetting resin is suitable for the resin, and epoxy, unsaturated polyester or the like can be used. The fiber-reinforced resin material may be a resin bundle impregnated with a liquid resin in advance (hereinafter referred to as a prepreg), or may be a liquid resin when a woven fiber bundle not impregnated with resin is wound around a tubular body. May be impregnated into the fiber with a brush or the like. After winding, the heat-shrinkable tape may be applied with a molding pressure at the same time when the winding resin is finally heated and cured, or the whole may be wrapped with a vacuum bag and autoclaved. As described above, the fiber-reinforced resin tubular body could be joined in a T-shape.

[0011]

As is clear from the above description, the fiber-reinforced resin pipe body is adhered by the joining metal fitting having the gap between the flanges of the mating surface of the two-part joining metal fitting, and the pressure is applied by utilizing the gap. Therefore, a defective adhesion portion is unlikely to be formed in the bonding layer, and the thickness of the adhesive layer is uniform, so that the adhesive strength is further increased.

Further, since the fiber reinforced resin material is wound around the boundary area between the end of the split joint fitting and the fiber reinforced resin pipe as shown in FIG. 4, the fiber reinforced resin pipe is transferred to the joint fitting. On the contrary, when the load is transferred from the fitting to the fiber reinforced resin pipe, the load is not only applied to the adhesive but also to the fiber reinforced resin material, so the stress level generated in the adhesive layer can be reduced. The load that can be transmitted can be greatly improved. When the peeling force from the fiber reinforced resin pipe is applied to the split joint fitting, the strength at that time is not the strength of the adhesive but the strength of the adhesive, and is much higher than the strength of the adhesive. It becomes the strength of the inside fiber, and the load that can be transmitted can be greatly improved.

[0013]

[Example] Two fiber-reinforced resin tubular bodies having an outer diameter of 180 ^+1.0 _-0 mm and a T-shaped two-part joint fitting made of aluminum and having a thickness of 3 mm were prepared. The radius of curvature of the inner surface, which is the bonding surface of the metal fitting, is 91 ⁺⁰ _-1.0 mm, and the mating surface flange spacing is 6 mm.
Is. The bonding surface of the bonding metal was shot blasted to make an active surface appear and the surface roughness was made suitable for bonding, and then degreasing was performed with methyl ethyl ketone. Apply a liquid adhesive (Chirageigy Araldite 136N) to the bonding surface of the fiber reinforced resin tube and the bonding surface of the metal fitting,
I made them stick. Immediately after that, a through hole is provided in the flat part of the flange with a hand drill, pressure is applied between the flanges using M6 bolts and nuts, and then put in the dryer as it is and heated at 85 ° C for 30 minutes to cure the adhesive. The body to be joined and the metal fitting are integrated. After the adhesive was hardened, the adhesive was taken out from the dryer, the boundary between the joint and the fiber-reinforced resin tube was ground with an air sander, and degreased with methyl ethyl ketone. Next, a carbon fiber plain weave prepreg having a width of 100 mm and a length of 3.2 m is wound around the location for 5 turns, and then 25 m in width.
m heat-shrink tape (Airtech Co. A575) was helically wound, put in the dryer again, and heated at 120 ° C. for 120 minutes to cure the prepreg.

[0014]

As is apparent from the above description, the manufacturing method according to the present invention makes it possible to supply a method for joining fiber-reinforced resin pipes, which can greatly improve the load that can be transmitted. .

[Brief description of drawings]

FIG. 1 is a perspective view in which a fiber-reinforced resin pipe body is arranged in a T shape and is bonded by using a split metal fitting.

FIG. 2 is a view seen from the upper surface of a joint in which a tubular body made of a fiber-reinforced resin is arranged at 45 degrees and which is adhered using a split metal fitting.

FIG. 3 is a view of a joint made by arranging a fiber-reinforced resin tubular body in a + shape and adhering it using a split metal fitting.

FIG. 4 is a cross-sectional view including a joint fitting flange portion.

FIG. 5 is a perspective view of the entire joint after the fiber reinforced resin material is wound around the boundary between the split metal joint and the fiber reinforced resin pipe body after bonding the metal joint.

[Explanation of symbols]

11 ... Fiber reinforced resin tubular body 12 ... Fiber reinforced resin tubular body 13 ... Fiber reinforced resin tubular body 14 ... Fiber reinforced resin tubular body 15 ... Fiber reinforced resin tubular body 16 ... Fiber reinforced resin tubular body 21 ... Split joint metal fitting 22 ... Split joint metal fitting 31 ... Shuck vise 32 ... Bolt / nut 33 ... Fiber reinforced resin material 34 ... Fiber reinforced resin material 35 ... Fiber reinforced resin material

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁵ Identification number Internal reference number FI Technical display location B29L 23:00 4F (72) Inventor Toshikazu Takeda 2-6-3 Otemachi, Chiyoda-ku, Tokyo Shin-Nihon Steel Works Ltd. (72) Inventor Juro Aso 20-1 Shintomi, Futtsu-shi Shin Nippon Steel Co., Ltd. Technical Development Headquarters (72) Inventor Kanaya Daizo 1-1 Sanbonmatsucho, Atsuta-ku, Nagoya, Japan Vehicle Manufacturing Co., Ltd.

Claims (1)

[Claims] 1. When two or more fiber-reinforced resin pipes are crossed and joined together, a gap is formed between the outer surface of the fiber-reinforced resin pipe which is the article to be joined and the inner surface of the joining metal fitting which is the adhesive surface. Adjusting the curvature of the inner and outer surfaces so that it is within 1 mm, using a split metal fitting with a joint formed, apply an adhesive between the object to be bonded and the metal fitting, and pressurize the adhesive surface. The adhesive is hardened to integrate the article to be joined and the metal fitting, and then the boundary area between the end of the metal fitting and the fiber reinforced resin pipe is reinforced with a fiber reinforced resin material, and then the fiber reinforced resin material A method for joining a fiber-reinforced resin pipe body, comprising: