JP2000127254A - Manufacture of tubular body, winding member for winding prepreg on core material and apparatus for winding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a tubular body having extremely little occurrence of a void capable of winding a prepreg tightly on a core material without gap in the case of manufacturing the body made of a fiber- reinforced composite material having a complicated surface shape, a member for winding the prepreg and an apparatus for winding it. SOLUTION: The tubular body made of a fiber-reinforced composite material is manufactured by winding a prepreg on a core material by a rolled winding member 10, curing the prepreg, and then drawing the core material. A columnar pressing part 12 is formed on a periphery of a shaft 11 of the member 10. A tube is arranged in the part 12, and a fluid is introduced into the tube to expand the part 12. The prepreg can be tightly wound on the core material without gap while pressing the prepreg to the core material by the expanded part 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a tubular body made of a fiber-reinforced composite material such as a golf club shaft, a fishing rod, and various rolls by winding a prepreg around a core material and curing the core material. The present invention relates to a method and a winding member and a winding device for winding a prepreg around a core material. In particular, the present invention relates to a method for manufacturing a tubular body suitable for forming a tubular body whose cross-sectional dimension and cross-sectional shape changes in the longitudinal direction, and a winding member and a winding device for winding a prepreg around a core material.

[0002]

2. Description of the Related Art Conventionally, as a method for producing a tubular body from a fiber reinforced composite material, the following three methods are generally roughly known. The first manufacturing method is a so-called pultrusion molding method. In the pultrusion molding method, after a continuous reinforcing fiber is applied and impregnated with a matrix resin, the fiber is passed through a die having a ring-shaped cross section. At this time, when the matrix resin is a thermosetting resin, the resin is cured when passing through the dice by heating the dice, or when the matrix resin is a thermoplastic resin, the same resin is used. By cooling and solidifying, a tubular body made of a fiber-reinforced composite material is manufactured.

[0003] A second manufacturing method is a so-called filament winding molding method. In this filament winding molding method, a continuous reinforcing fiber is applied and impregnated with a matrix resin, and then the fiber is regularly wound around a rotating core material, and the resin is heated and cured, or cooled and solidified to produce a tubular body. .

A third manufacturing method is a method called a sheet wrap molding method or a tape wrap molding method. In this sheet wrap molding method or tape wrap molding method, after winding a sheet-shaped or tape-shaped prepreg having a predetermined width around a rotating core material, heat curing,
Alternatively, it is cooled and solidified to produce a tubular body. Furthermore, it is generally known that a tubular body is manufactured by combining the above-described first to third manufacturing methods.

It is preferable to select a method for manufacturing these tubular bodies in view of various functions and performances such as bending strength and torsional strength required according to the intended use of the tubular body. In any of these manufacturing methods, it is needless to say that it is preferable to reduce the molding cost and to minimize defects such as voids during the manufacturing of the tubular body.

Meanwhile, among the above-mentioned manufacturing methods, in the sheet wrap forming method and the tape wrap forming method, conventionally, many techniques for winding a prepreg around a rotated core material have been proposed. For example, a core material is installed in a manufacturing apparatus for a tubular body having an operating mechanism similar to that of a lathe, and a prepreg is wound around the core material while rotating the core material at the same time.

As shown in FIG. 7, for example, a core member C is sandwiched by a winding member composed of a plurality of rolls (three in the example shown in FIG. 7), and the core material C is While rotating, the sheet-shaped prepreg P drawn from the prepreg supply unit 4 may be introduced between the concentric material C and the roll 1, and the prepreg P may be wound around the core material C. The core material C is supported by a core material support portion, and the support portion is positively driven to rotate, whereby the core material C is supported.
Can be directly rotated. In this case, the roll 1 is supported so as to be freely rotatable. Alternatively, the core material C can be axially rotated by driving and rotating the drive roll 1 with the roll 1 as a drive roll that can be driven and rotated.

Further, as shown in FIG. 8, for example, a winding member composed of a pair of upper and lower flat plates 2 and 2 is disposed above and below a core C which is rotatably supported by a core support. The upper flat plate 2 is moved downward (in the X direction) by the cylinder 3, and the core C is held between the upper and lower flat plates 2, 2 as shown in FIG. Thereafter, the lower plate 2 was moved in the horizontal direction (Y direction) to rotate the core C axially, and was drawn out of the prepreg supply unit 4 between the core C and the flat plate 2. A method of introducing a sheet-shaped prepreg P and winding the prepreg P around the core material C is known.

In the sheet wrap forming method and the tape wrap forming method, voids are easily generated due to irregularities on the surface of the prepreg, and in order to reduce the generation of such voids, a sheet or tape-shaped prepreg is used. It is necessary to wrap tightly with no gap. Therefore, in the method of winding the prepreg around the core material using the above-described winding member, the pressing surface of the winding member against the core material, that is, the peripheral surface of the roll or the surface of the flat plate, is formed of an elastic material such as rubber. With the required thickness,
The pressing surface is pressed against the prepreg.

[0010]

By the way, in recent years, this kind of tubular body used as a shaft of a golf club, a fishing rod, a tennis racket, various rolls and the like has a complicated surface shape. And the tubular body has a cross-sectional shape or cross-sectional dimension that changes in the longitudinal direction. The core material used in manufacturing such a tubular body naturally has the same complicated surface shape as the tubular body.

However, even if the above-mentioned winding member in which the contact surface with the core material is coated with the elastic material as described above is used, the prepreg can be wound tightly along such a complicated surface shape. No, many voids occur. Therefore, by lowering the hardness of the elastic material,
It has been attempted to bring the winding member into close contact with the shape of the core material, but when the core material has a complicated surface shape, a pressing force for pressing the winding member when winding a prepreg is: It will be unevenly distributed over the entire length of the core material.

In addition, by reducing the hardness of the elastic material and making it easier to deform, the prepreg can easily conform to the surface shape of the core material, but it is difficult to apply a uniform pressing force in the length direction. Since it is not possible to completely adhere the core material to the core material, imperfect deformation of the elastic material based on the unevenly distributed pressing force causes wrinkles in the prepreg, and the tubular body formed by the wrinkles Streaks will form on the surface of the.

The present invention has been made in order to solve such a problem.
In producing a tubular body having a complicated surface shape, a prepreg can be wound tightly around a core material of a similarly complicated shape without gaps, and a tubular body capable of producing a tubular body with extremely few voids can be produced. A method of manufacturing the body,
It is an object of the present invention to provide a winding member and a winding device for winding a prepreg around a core material.

[0014]

In order to achieve the above object, the present invention relates to a method of winding a prepreg around a core material, curing the prepreg, and extracting the core material to obtain a fiber-reinforced composite material. In a method of manufacturing a tubular body,
By a winding member whose pressing surface can be expanded by fluid,
The main configuration is a method for manufacturing a tubular body, wherein the prepreg is wound around the core while the prepreg is pressed against the core.

[0015] Since the pressing surface of the winding member can be expanded by the fluid, the prepreg is pressed against the core material by a uniform pressing force in the length direction of the core material. Further, the pressing surface is deformable along the surface shape of the core material. Therefore, even if the core material has a complicated surface shape such that the cross-sectional shape or cross-sectional dimension changes in its length direction, the prepreg is tightly wound around the core material without any gap, and the No void is generated in the tubular body thus obtained.

The prepreg is obtained by impregnating a reinforcing fiber with a matrix resin. Organic reinforcing fibers such as aramid fibers, carbon fibers,
Fibers having high strength and a high elastic modulus, such as glass fibers, boron fibers, alumina fibers, silicon carbide fibers, and tungsten carbide fibers, can be employed, and are continuous fibers or continuous fiber bundles. One type of reinforcing fiber may be used as the reinforcing fiber in the prepreg, or a plurality of types of reinforcing fiber may be used. The reinforcing fibers are regularly or irregularly arranged or woven and knitted to form a sheet, which is impregnated with the matrix resin. Normally, in applications where specific strength or specific elastic modulus is required to be reinforced in a specific direction, it is preferable to use a prepreg in which the reinforcing fibers are aligned in a single direction. Alternatively, it is also possible to use a prepreg in which a reinforcing fiber is previously processed into a sheet form such as a long fiber mat or a woven fabric and impregnated with a matrix resin.

The thermosetting resin usable as the matrix resin includes epoxy resin, polyester resin, phenol resin, polyimide resin, maleimide resin, acetylene-terminated resin, vinyl-terminated resin, and cyanate ester-terminated resin. And the like, but are not limited thereto. Further, two or more of these resins may be used in combination.
Furthermore, a thermoplastic resin may be used in combination to improve the toughness as long as the above-mentioned resin is the main component.

The prepreg in the form of a sheet can be unwound from a roll and used. In that case, it is preferable to control so that the tension at the time of unwinding the prepreg is constant. In addition, as a method of controlling the tension at the time of unwinding, known means can be appropriately used.

Further, there is no particular limitation on the material of the core material, for example, chemical stability to the matrix resin,
Any material having physical stability such as a shape can be appropriately selected and used.

According to another aspect of the present invention, there is provided a winding member for winding a prepreg around a core, wherein a pressing surface for pressing the prepreg against the core is expandable by a fluid. It has a main configuration. It is preferable that a tube is provided inside the pressing surface, and the pressing surface can be expanded by introducing the fluid into the tube.

The pressing surface is preferably made of a material that has elasticity and expands when an internal pressure is applied. For example, it is preferable to use neoprene rubber. Further, it is preferable that the hardness and the elastic modulus of the pressing surface are determined according to the shape of the core material and various conditions when the winding member is used. Furthermore, when the prepreg is pressed against the core material, the main cause of wrinkling of the prepreg is to prevent unnecessary deformation of the pressing surface. It is important to select the conditions in.

The hardness of the prepreg wound around the core material is as follows:
It can be adjusted by the internal pressure of the fluid filled in the pressing surface. Note that the fluid is not particularly limited, and it is preferable to select a fluid having a compressive property that can exert a necessary pressing force. The temperature of the fluid is preferably adjusted in accordance with the use conditions of the winding member and the characteristics of the matrix resin of the prepreg. That is, when the prepreg is wound, the tack of the prepreg can be adjusted by adjusting the temperature of the winding member, and the adhesive force of the matrix resin can be optimized.

The tube is filled with liquid and expands to expand the pressing surface. Therefore, it is preferable to select an inflatable material for the tube.
Further, it is preferable that the diameter of the tube and the loading ratio into the pressing surface are appropriately determined according to the surface shape of the core material.

The winding member is preferably in the form of a flat plate. In this case, the flat winding member is disposed vertically, and the core is sandwiched between the flat winding members. I do. Alternatively, the winding member is preferably in a roll shape. In this case, it is preferable that the core material is sandwiched by a plurality of roll-shaped winding members.

Further, the present invention relates to a winding device for winding a prepreg around a core material, wherein the above-mentioned winding member, a prepreg supply section for supplying the prepreg to the winding member, and The winding device further includes a core supporting portion that rotatably supports the winding member with respect to the shaft.

In the case where a plate-shaped winding member is adopted as the winding member, the plate-shaped winding member can be moved in the same plane, and the core member is pivoted by the movement of the winding member. Preferably, it is rotated. Further, when a roll-shaped winding member is employed as the winding member, the roll-shaped winding member can be driven and rotated, and the core member is axially rotated by the drive rotation of the wound member. Is preferred. Alternatively, the core support may be positively driven to rotate.

[0027]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the accompanying drawings by way of specific examples.
FIG. 1 is a perspective view of a roll-shaped winding member 10 according to a preferred embodiment of the present invention, which is used when a sheet-shaped prepreg is wound around a core material by the method of the present invention, and FIG. It is sectional drawing of the winding member 10.

The roll-shaped wrapping member 10 is used in place of at least one roll 1 shown in FIG. 7, and has a central shaft portion 11 and a cylindrical pressing member formed around the coaxial portion 11. And a pressing portion 12, and the surface of the pressing portion 12 forms a pressing surface. In FIG. 1, reference numeral 13 denotes a rotary joint of the shaft 11.

The pressing portion 12 has a surface layer 12a made of a thin sheet of neoprene rubber.
Has elasticity and can expand and contract. Further, a tube 12b made of neoprene rubber is provided in the pressing portion 12 in a state of being spirally wound around the shaft portion 11 inside the surface layer portion 12a. Same tube 12b
Of the core material C and the loading ratio into the pressing portion 12, that is, the loading interval are appropriately determined according to the surface shape of the core material C. Also,
The tube 12b partially has a fluid supply / discharge port (not shown). By supplying a fluid into the tube 12b from the supply / discharge port, the tube 12b expands,
Accordingly, the surface portion 12a of the pressing portion 12 is pushed up, and the entire pressing portion 12 expands.

When the roll-shaped winding member 10 is used as the roll 1 of the apparatus shown in FIG. 7, the core supported rotatably by the center of the shaft of the roll-shaped winding member 10 and a core material supporting portion. The roll-shaped wrapping member 10 is installed such that the distance from the axis center of the material C is smaller than the maximum radius when the pressing portion 12 of the roll-shaped wrapping member 10 expands to the maximum.

The three roll-shaped winding members 10 are arranged at equal intervals around the core C, and the core C is sandwiched by the winding members 10. At this time, a fluid is introduced into the roll-shaped wrapping member 10, and the surface of the pressing portion 12, that is, the pressing surface, presses the core material C with a uniform pressing force over the entire length. By rotating and driving the roll-shaped winding member 10 in this state, the core C rotates around the shaft. At the same time, a sheet-like prepreg P drawn from the prepreg supply unit 4 is introduced between the winding member 10 and the core material C, and the core material C is pressed while the prepreg P is pressed by the winding member 10. The same prepreg P
Wrap.

As described above, since the prepreg P is wound while being pressed by the winding member 10,
The prepreg P is tightly wound around the core material C without any gap, and no void is generated. Further, since the pressing surface is expanded in a state where a uniform internal pressure is applied by the fluid, a uniform pressing force acts on the entire length of the core material C, and the prepreg is uniformly wound.

Although the above-mentioned core material C is a cylindrical body having a uniform cross-sectional dimension in the longitudinal direction, according to the method of the present invention, for example, a core material C 'as shown in FIGS. It is also possible to produce tubular bodies using The core material C '
Is composed of a small diameter portion having a diameter of 5 mm and a length of 150 mm, a large diameter portion having a diameter of 10 mm and a length of 150 mm, and a taper portion having a length of 50 mm connecting the small diameter portion and the large diameter portion. It is a rod-shaped body having a total length of 350 mm.

The core material C 'having such a complicated surface shape
However, if the above-mentioned roll-shaped winding member 10 is used when winding the prepreg P, the pressing surface of the winding member 10 is deformed along the surface shape of the core material C ′, and the prepreg is uniform. Therefore, the prepreg can be tightly wound around the core material C 'without any gap. Further, since the surface portion 12a of the pressing portion 12 employs neoprene rubber which is rich in elasticity and elasticity as a material, the pressing surface of the pressing portion 12 can be easily deformed along the surface shape of the core material C. Since the prepreg is pressed with a uniform pressing force, wrinkles do not occur on the prepreg.

In the above-described embodiment, the core material C is supported by the three roll-shaped winding members 10. Further, by rotating at least one roll-shaped winding member 10 and allowing other roll-shaped winding members 10 to freely rotate, the core material C is relatively moved with respect to the winding member 10. The shaft is rotating. However, the configuration for rotating the core C axially is not limited to this. For example, all the roll-shaped winding members 10 are arranged so as to be freely rotatable, and a core supporting portion that supports the core C so as to be rotatable is positively driven to rotate, and the core C is directly pivoted. It is also possible to rotate. Further, both the roll-shaped winding member 10 and the core material C can be driven to rotate.

FIG. 3 is a perspective view of a plate-shaped wrapping member 20 according to another preferred embodiment of the present invention, which is used when wrapping a sheet-like prepreg around a core material by the method of the present invention. 4 is a cross-sectional view of the flat plate-shaped winding member 20.

The flat wrapping member 20 is used in place of at least one flat plate 2 shown in FIG. 8, and includes a support plate 21 and a pressing portion 22 formed on one surface of the support plate 21. And the surface of the pressing portion 22 constitutes a pressing surface.

The pressing portion 22 has a surface layer 22a made of a thin sheet of neoprene rubber.
Has elasticity and can expand and contract. Further, in the pressing portion 22, tubes 22b made of neoprene rubber are arranged at equal intervals between the surface layer portion 22a and the support plate 21 so as to communicate with each other. Further, it has a fluid supply / discharge port 23 which communicates with a part of the tube 22b. By supplying a fluid into the tube 22b from the supply / discharge port 23, the tube 22b expands,
Accordingly, the surface layer portion 22a of the pressing portion 22 is pushed up, and the entire pressing portion 22 expands.

In order to wind the prepreg around the core C by using the flat-shaped winding member 20 as the flat plate 2 of the apparatus shown in FIG. 8, a pair of the winding members 20 are opposed to the pressing portions 22 thereof. Place them in parallel. The upper plate-shaped winding member 20 can be moved in the vertical direction (X direction) by the cylinder 3, and the lower plate-shaped winding member 20 can be moved in the horizontal direction (Y direction).

The core material C is placed on the lower plate-shaped winding member 20, and the upper plate-shaped winding member 20 is lowered in the X direction by the cylinder 3 to thereby lower the upper and lower winding members 20. The core material C is sandwiched between. At this time, a fluid is introduced into each of the upper and lower plate-shaped winding members 20, and the core material C is pressed with a uniform pressing force over the entire length by the surface of the expanded pressing portion 22, that is, the pressing surface. . In this state, the lower plate-shaped winding member 20 is moved in a horizontal direction (Y direction) orthogonal to the axial direction of the core material C to rotate the core material C axially. A sheet-shaped prepreg P drawn from the prepreg supply unit 4 is introduced between the core material C and the wrapping member 20.
The prepreg P is wound around the core material C while pressing the prepreg P.

As described above, even in the case of the flat-shaped winding member 20, similarly to the above-mentioned roll-shaped winding member 10, the prepreg P is pressed by the expanded pressing surface with a uniform pressing force, and Pre-preg P for winding around material C
Is tightly wound around the core material C without any gap, and no void is generated. Further, even when the prepreg is wound around the core material C 'as shown in FIGS. 5 and 6, the use of the flat-shaped winding member 20 allows the pressing surface made of neoprene rubber having high elasticity and elasticity. However, since the prepreg is deformed smoothly along the surface shape of the core material C 'and the prepreg is pressed uniformly, the prepreg can be tightly wound around the core material C' without gaps without wrinkles. .

In the above-described embodiment, the core C is axially rotated by moving the plate-shaped winding member 20 in the horizontal direction. It can be driven and rotated. For example, when winding a prepreg around the core material C 'having a complicated surface shape,
By positively driving and rotating the core material C ', the flat-shaped winding member 2 is fixed in a state in which the position of the core material C' is fixed.
0, which is preferable because the core material C 'can be pressed with a uniform pressing force.

It should be noted that any of the above-mentioned winding members 10,
20 also uses neoprene rubber for the surface layers 11a, 12a of the pressing portions 12, 22 and the tubes 12b, 22b, but the material is not limited to the neoprene rubber, and has appropriate elasticity. Any material may be used as long as it has a characteristic of expanding when an internal pressure is applied by a fluid.

Further, as the fluid, a fluid having a compression characteristic capable of generating a necessary pressing force can be selected. Further, the use environment of the winding members 10, 20;
Before supplying the fluid to the tubes 12b and 22b, the temperature of the fluid can be adjusted according to the use conditions and the characteristics of the matrix resin in the prepreg.

Hereinafter, an embodiment of the tubular body manufactured by the manufacturing method of the present invention using the above-described winding members 10 and 20 will be compared with a comparative example manufactured using another winding member. Will be explained. In each of the following examples and comparative examples, a sheet-shaped prepreg manufactured as follows was used. That is, an epoxy resin manufactured by Mitsubishi Rayon Co., Ltd. was applied as a matrix resin onto release paper using a die coater to produce a resin film, and then carbon fibers (TR30S manufactured by Mitsubishi Rayon Co., Ltd.)
12L) were arranged in one direction, overlapped with the resin film, and heated and pressed to impregnate the fibers with the matrix resin, thereby obtaining a prepreg having a carbon fiber weight of 125 g / m ² and a resin content of 30%. This prepreg was slit into a width of 300 mm in a direction perpendicular to the fiber direction to obtain a sheet-shaped prepreg.

Embodiment 1 In the above-described roll-shaped wrapping member 10, the tube 1 disposed inside the pressing portion 12
For 2b, a neoprene rubber having an outer diameter of about 6 mm and an inner diameter of about 4 mm is used. Such a roll-shaped winding member 1
5 and the above-mentioned prepreg is attached to the core material C ′ shown in FIGS. 5 and 6 by 9% with respect to the axis of the same core material C ′.
It was wound to 0 °. The number of windings at this time was five layers, and the winding speed was 10 rpm in terms of the core material C '. The tube was filled with 35 ° C. hot water as a fluid at a pressure of about 0.1 MPa,
The pressing portion 12 was expanded. The pressing portion 1 at this time
The rubber hardness of No. 2 was 80 ° and the thickness was 5 mm.

After the prepreg was wound, a polypropylene tape having a width of 20 mm and a thickness of 30 μm was further wound on the wound material at a pitch of 2 mm, and was placed in a curing oven at 145 ° C. for 240 minutes to be cured. Thereafter, the polypropylene tape was peeled off, and the core material C 'was pulled out to obtain a fiber-reinforced composite material tubular body.

The tubular body had a good shape along the shape of the core material C '. When the tubular body was cut at the tapered portion and the cross section of the tubular body was observed, the layers of the prepreg were tight, and no voids were generated between the layers. Further, no streaks due to wrinkles of the prepreg were observed on the surface of the obtained tubular body, and the appearance was good.

Comparative Example 1 The above-described roll-shaped wrapping member 1
A prepreg was wound around the core material C ′ in the same manner as in Example 1 above, using a metal heating roll having a diameter of about 50 mm instead of 0, to produce a fiber-reinforced composite material tubular body. The shape of the obtained tubular body was defective, and the shape at the tapered portion was different from the shape of the core material C '. Also,
Observation of the cross section by cutting at the tapered portion revealed that large voids were generated between the layers of the prepreg.

[Comparative Example 2] The above-mentioned roll-shaped wrapping member 1
A prepreg was wound around the core C 'in the same manner as in Example 1 above, using a rubber heating roll having a diameter of about 50 mm instead of 0, to produce a tubular body made of a fiber-reinforced composite material. The rubber heating roll had a surface rubber hardness of 40 °. The obtained tubular body had a good shape following the shape of the core material C ', but due to the low rubber hardness, unnecessary deformation occurred at the time of pressing, which caused wrinkles on the surface of the prepreg. Was left as a streak on the surface of the tubular body. Also, when cut at the tapered part and observed the cross section,
Small voids were generated between layers of the prepreg.

[Embodiment 2] The above-mentioned plate-shaped winding member 2
0, the tube 22 disposed inside the pressing portion 22
For b, a material made of neoprene rubber having an outer diameter of about 6 mm and an inner diameter of about 4 mm is used, and the thickness of the flat winding member 20 is about 30 mm. Using the flat-shaped winding member 20, the prepreg is attached to the core material C ′ shown in FIGS. 5 and 6 by 90 ° with respect to the axis of the
It was wound so that. The number of windings at this time was five layers, and the winding speed was 1 in terms of the core material C '.
It was set to 0 rpm. The tube was filled with 35 ° C. warm water as a fluid at a pressure of about 0.1 MPa, and the pressing portion 12 was expanded. At this time, the rubber hardness of the pressing portion 12 was 80 ° and the thickness was 5 mm.

After the prepreg was wound, a polypropylene tape having a width of 20 mm and a thickness of 30 μm was further wound on the wound material at a pitch of 2 mm, and was placed in a curing oven at 145 ° C. for 240 minutes to be cured. Thereafter, the polypropylene tape was peeled off, and the core material C 'was pulled out to obtain a fiber-reinforced composite material tubular body. When the tubular body was cut at the tapered portion and the cross section of the tubular body was observed, the layers of the prepreg were tight, and no voids were generated between the layers. Further, no streaks due to wrinkles of the prepreg were observed on the surface of the obtained tubular body, and the appearance was good.

Comparative Example 3 A prepreg was wound around a core C 'in the same manner as in Example 2 except that a metal heating flat plate having a thickness of about 30 mm was used in place of the plate-shaped winding member 20 of Example 2. Thus, a tubular body made of a fiber-reinforced composite material was manufactured. The shape of the obtained tubular body was defective, and the shape at the tapered portion was different from the shape of the core material C '. Also,
Observation of the cross section by cutting at the tapered portion revealed that large voids were generated between the layers of the prepreg.

[Comparative Example 4] Instead of the flat-shaped winding member 20 of the second embodiment, a rubber flat plate having a thickness of about 30 mm was used, and the prepreg was wound around the core material C 'in the same manner as in the first embodiment. A tubular body made of a fiber-reinforced composite material was manufactured. In addition,
The rubber heating roll had a surface rubber hardness of 40 °. The obtained tubular body had a good shape along the shape of the core material C ', but the rubber surface was so small that unnecessary deformation was caused on the roll surface, thereby causing wrinkles in the prepreg partially. However, in the obtained tubular body, streak-like scratches due to the wrinkles occurred. In addition, when the cross section was cut at the tapered portion and observed, a small void was generated between the layers of the prepreg.

[0055]

According to the manufacturing method of the present invention, the pressing surface of the winding member can be expanded, and when the prepreg is wound around the core, the prepreg is pressed against the core by the expanded pressing surface. At this time, the pressing surface expanded by the fluid is deformed along the surface shape of the core material, and for example, the prepreg is pressed by the uniform pressing force on the winding member also on the uneven portion including the curved surface shape. Since the prepreg can be pressed against the material, the prepreg is tightly wound around the core material. Therefore, the resulting tubular body made of the fiber-reinforced composite material has very little voids, and a streak-like scratch caused by wrinkles of the prepreg does not occur on the surface of the tubular body, and a tubular body having an excellent appearance is obtained. Can be.

[Brief description of the drawings]

FIG. 1 is a perspective view of a roll-shaped wrapping member according to a preferred embodiment of the present invention.

FIG. 2 is a sectional view of the roll-shaped wrapping member.

FIG. 3 is a perspective view of a flat-plate-shaped wrapping member according to another preferred embodiment of the present invention.

FIG. 4 is a cross-sectional view of the flat wrapping member.

FIG. 5 is a perspective view of a core that can be used in the method of the present invention.

FIG. 6 is a front view of the core material.

FIG. 7 is a schematic diagram of a winding device for winding a sheet-shaped prepreg around a core material.

FIG. 8 is a schematic view of another winding device for winding a sheet-shaped prepreg around a core material.

FIG. 9 is a schematic view showing a state in which a prepreg is wound by the winding device.

[Explanation of symbols]

 Reference Signs List 1 roll 2 flat plate 3 cylinder 4 prepreg supply unit 10 roll-shaped wrapping member 11 shaft portion 12 pressing portion 12a surface layer portion 12b tube 13 rotary joint 20 plate-shaped winding member 21 support plate 22 pressing portion 22a surface layer portion 22b tube 23 Supply / discharge port C, C 'Core material P Prepreg

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Hitoshi Takayama 4-160 Sunadabashi, Higashi-ku, Nagoya-shi, Aichi F-term in the Product Development Laboratory of Mitsubishi Rayon Co., Ltd. 2B019 AA14 AB51 AC00 2C002 AA05 CS05 MM02 PP01 4F205 AA36 AA39 AD16 AG08 AH02 AH59 AJ05 AM32 HA02 HA23 HA33 HA35 HA37 HA45 HB01 HC02 HC17 HF23 HK02 HK03 HK04 HK05 HK14 HK26 HK31 HK37 HL02

Claims (9)

[Claims] 1. A method for producing a fiber-reinforced composite material tubular body by winding a prepreg around a core material, curing the prepreg, and extracting the core material, wherein the pressing surface is expandable by a fluid. With a certain winding member,
A method of manufacturing a tubular body, comprising winding the prepreg around the core while pressing the prepreg against the core. 2. A winding member for winding a prepreg around a core material, wherein a pressing surface for pressing the prepreg against the core material is expandable by a fluid. 3. The winding member according to claim 2, wherein a tube is disposed inside the pressing surface, and the pressing surface can be expanded by introducing the fluid into the tube. 4. The wrapping member according to claim 2, wherein the wrapping member is flat.
Or the winding member according to 3. 5. The winding member according to claim 2, wherein the winding member has a roll shape. 6. A winding device for winding a prepreg around a core, comprising: a winding member according to claim 2; and a prepreg supply unit configured to supply the prepreg to the winding member. And a core supporting portion for supporting the core in such a manner that the core is rotatable with respect to the winding member. 7. The winding device according to claim 6, wherein the flat winding member is movable in the same plane, and the core member is axially rotated by the movement of the winding member. 8. The winding device according to claim 6, wherein the roll-shaped winding member is rotatable for driving, and the core member is axially rotated by the driving rotation of the winding member. 9. The winding device according to claim 6, wherein the core supporting portion is positively driven and rotated.