JPH0781566A - Curved hat type fiber reinforced resin composite pipe and method for manufacturing tank - Google Patents

Abstract

PURPOSE:To provide a lightweight curved hat by integrating the fibers in the crossing direction relative to the axial direction to be solidified in the FW method where the resin is impregnated in the fibers after the hand lay-up of the unidirectional pre- preg to sustain the axial load is executed on a curved hat type thin-walled tube made of iron, aluminum or the like and on the outer circumference of a tank. CONSTITUTION:After the hand lay-up of a pre-preg (about 0.12mm) where the glass short fibers are made mat to the aluminum tube of 100mm in outer diameter, 2mm in wall thickness, and of R=700mm in the radius of the curved part is executed, the hand lay-up of the pre-preg of the pitch type carbon fiber is executed so that the wall thickness may be about 2mm in the overlap width of 50mm at four points of A, B, C, D. After the mold releasing tape of 5mm in width is seamed under the tension of approximately 1kg, the tape is removed, and the filament is wound at the angle of + or -60 deg., 90 deg. at an appropriate design thickness by using the filament winding method where the epoxy resin is impregnated in the pitch type carbon fiber. The formed body is solidified in a solidifying furnace at 120 deg.C for about three hours to manufacture a composite restricting vehicle body made of crank type carbon fiber reinforced resin.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a curved hat-type fiber-reinforced resin composite material pipe for applying a carbon fiber-reinforced resin composite material member to a high-speed railway vehicle in which the requirements for lightweight, high strength and high elasticity are increasing. It relates to a method of manufacturing a tank.

[0002]

2. Description of the Related Art Carbon fiber reinforced resin composite materials having excellent specific strength and specific rigidity occupy an important position as materials for aviation and space as well as sports materials. At present, as a method for producing a carbon fiber reinforced resin composite material, the FW method, in which a carbon fiber and a resin are wound around a mandrel (metal, ceramics, etc.) to produce a cylindrical molded body, is easy to mold and has a short molding time. Since it is excellent, the carbon fiber reinforced resin composite material molded body using the FW method has begun to be used as a product such as a roll in the field of general industry.

At present, the carbon fiber reinforced resin composite material is used in a portion having a relatively low load-bearing ratio, but by utilizing its strength and elastic modulus, it can be used in a high-speed railway car body which is a field of application of the present invention. (EN) Provided is a curved hat type fiber reinforced resin composite material pipe and a tank which are easily used.

[0004]

The FW method is a manufacturing method suitable for manufacturing a cylindrical straight pipe. Since many of the beams of the high-speed rail car bogies today have a curved hat shape, only the bonding method or the integral molding method can be considered for the carbon fiber reinforced resin composite material for which the welding connection method is impossible. However, it is difficult to compensate for high strength by the bonding method. At present, the only integral molding method is the prepreg hand lay-up method, which has poor workability and cannot form a curved portion. However, it is very important to reduce the weight of the current structure, which requires extremely high speed, and it is very important to make a curved hat-shaped beam with a carbon fiber reinforced resin composite material that has a high possibility of achieving lightweight and high strength. There is.

[0005]

In the present invention, for use as a beam for a high-speed railway vehicle body, a curved hat type thin-walled pipe made of iron, aluminum or the like and a unidirectional prepreg that bears axial force on the outer circumference of a tank are hand-laid up. After that, in the FW method in which fibers are impregnated with resin, ± 45 ° to 90 ° with respect to the axial direction that is subjected to torque and circumferential crushing force, the fibers are molded and integrally molded and cured to form a curved hat type fiber reinforced resin composite pipe. And the tank was manufactured.

[0006]

The present invention will be described in detail below based on examples.

The reinforcing carbon fiber used in the present invention is
The raw material may be any of polyacrylonitrile (PAN) type, rayon type and pitch type. Further, the carbon fiber is a continuous fiber, and the resin impregnated in this fiber may be any resin such as an epoxy resin and a phenol resin.

A curved hat type as shown in FIG.
A hand lay-up of a prepreg with a short glass fiber made of mat to prevent galvanic corrosion in a thin pipe of mm of iron and aluminum and a tank. A unidirectional carbon fiber prepreg that gives axial force to this is hand laid up.

At this time, since the bent portion cannot be hand-laid up, a prepreg having slits as shown in FIG.
Laminate to a predetermined thickness while overlapping by 00 mm. Since the slits of the prepreg are in the same direction as the fiber direction and do not cut the fiber, the elasticity and strength of the molded body are not impaired.

If the overlap width is less than 30 mm, the elastic modulus and strength of the entire beam will be reduced.
Even if it is 100 mm or more, elasticity and strength do not change, and the amount of overlap increases, and uniform molding cannot be performed.
This prepreg molded body is tightened with a release tape and pressed to improve the adhesiveness of the prepreg. After removing the release tape, the carbon fiber impregnated with the resin is ± 4 against the axial direction by the FW method.
Mold to an angle of 5 ° to 90 °. The bending angle θ in FIG. 2 is 5
In the case of less than °, all can be formed by the FW method without much difference from a straight pipe, but the curved hat-shaped beam generally used for high-speed railway vehicles has a bending angle θ of 20 to 30 ° and 4
Fibers of 5 ° or less do not follow the mold, so it is theoretically impossible to form them by the FW method.

This FW product is cured in a curing furnace at a temperature of about 120 ° C. to obtain a product.

[0012]

EXAMPLE A prepreg (about 0.12 mm) in which glass short fibers are matted to an aluminum pipe having an outer diameter of 100 mm, a wall thickness of 2 mm, and a bent portion R = 700 mm shown in FIG. Figure 1A,
Hand lay-up was performed at four places B, C and D so that the overlap width was 50 mm and the wall thickness was about 2 mm. A release tape having a width of 5 mm was tightened with a tension of about 1 kg, and then removed. Pitch-based carbon fibers were impregnated with epoxy resin around this, and were wound with an appropriate design thickness at angles of ± 60 ° and 90 ° using the FW method (FIG. 3). This molded body was cured in a curing furnace at 120 ° C. for about 3 hours to produce a crank type carbon fiber reinforced resin composite material high-speed vehicle body beam. Length 2500 mm
When the three-point bending was carried out at, the beam had a breaking load of 2.5 ton and a weight of about 14 kg.

[0013]

As is clear from the above, since the present invention has developed a super-lightweight, highly elastic, and high-strength curved hat-shaped beam, it becomes possible to manufacture a vehicle that is lighter as a high-speed railway vehicle and suitable for high speeds. .

[Brief description of drawings]

FIG. 1 is a view showing a projection view of a curved hat type aluminum pipe.

FIG. 2 is a diagram showing an example of a cut pattern of a unidirectional prepreg.

FIG. 3 is a diagram showing a molding stacking diagram of an example.

[Explanation of symbols]

 A, B, C, D Prepreg Overlay part E Slit part 31 1.5mm 90 degree FW laminated part 32 1.8mm ± 45 degree FW laminated part 33 2.0mm 0 degree unidirectional prepreg 34 Glass short fiber was matted Prepreg 35 3.0 mm aluminum pipe

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁶ Identification number Internal reference number FI technical display location // B29L 31:30 (72) Inventor Masayuki Ando 5-13-16, Ginza, Chuo-ku, Tokyo (72) Inventor Shuji Takiyama Nippon Steel Chemical Co., Ltd. 5-13-16 Ginza, Chuo-ku, Tokyo

Claims (1)

[Claims] 1. A filament winding method (hereinafter referred to as FW method) in which fibers are impregnated with a resin after hand laying up a curved hat type thin-walled pipe of iron, aluminum or the like and a unidirectional prepreg that bears an axial force on the outer circumference of a tank. A method for manufacturing a curved hat type fiber-reinforced resin composite material pipe and a tank, which comprises molding and curing ± 45 ° to 90 ° fibers that bear torque and circumferential crushing force.