JP3550759B2 - Method and apparatus for manufacturing FRP cylinder - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a method and an apparatus for manufacturing a fiber reinforced plastic (FRP) cylinder, and more particularly, to a method and an apparatus for manufacturing an FRP cylinder by a filament winding molding method.
[0002]
[Prior art]
There is known a method of manufacturing an FRP cylinder body, which is called a filament winding molding method, in which a reinforcing fiber bundle is impregnated with a resin in a resin impregnation bath, and the resin-impregnated reinforcing fiber bundle is wound around a rotating mandrel at a predetermined angle. I have. In this molding method, usually, the resin-impregnated reinforcing fiber bundle is wound around the mandrel in a predetermined number of layers at a predetermined angle, so that at the end of the mandrel, the resin-impregnated reinforcing fiber bundle to be wound is It has to be turned back.
[0003]
The folding of the resin-impregnated reinforcing fiber bundle at the end of the mandrel is performed smoothly while preventing the shift of the reinforcing fiber and the shift of the winding angle, and to improve the mechanical strength of the end of the molded FRP cylinder. Then, a ring member having a plurality of pins planted on the outer peripheral surface is fitted to both ends of the mandrel, a resin-impregnated reinforcing fiber bundle is wound thereon, and then the reinforcing fiber bundle is folded back. Is known (Japanese Patent Publication No. 4-15731).
[0004]
[Problems to be solved by the invention]
However, in the above-described conventional molding method, since the ring-shaped member is finally integrated with the FRP cylinder, a large number of pins of the ring-shaped member are embedded at the end of the completed FRP cylinder. It becomes. Since these pins are foreign matter to the FRP cylinder, they do not necessarily improve the mechanical strength of the FRP cylinder, and in some cases, may decrease the mechanical strength. At least, the portion where the pin is embedded is different in physical properties as compared with other portions.
[0005]
In addition, as a result of the integration of the ring-shaped member, the thickness of the FRP cylinder increases at least in this portion, so that it becomes difficult to finish the end of the FRP cylinder with desired dimensional accuracy.
[0006]
An object of the present invention is to solve the above-mentioned problems in the conventional filament winding molding method, obtain desired uniform physical properties over the entire length, and achieve a desired dimensional accuracy. An object of the present invention is to provide a method and an apparatus for manufacturing an FRP cylinder that can be easily performed.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, a method of manufacturing an FRP cylinder according to the present invention comprises the steps of: winding a reinforcing fiber bundle impregnated with a resin around a mandrel; then curing the resin to form the FRP cylinder; The shaft portion has a flange portion having substantially the same diameter as the central portion in the axial direction of the mandrel, and the outer peripheral surface of the flange portion is formed of a needle-like body that has a sharp tip and can pierce and penetrate the resin-impregnated fiber bundle. A plurality of locking means for the resin-impregnated fiber bundle are provided so as to protrude in the circumferential direction and are slidable in the axial direction of the mandrel. axial central portion mounting a sleeve formed in smaller diameter than, as involving locking means and the sleeve winding a resin-impregnated reinforcing fiber bundle, winding the locking means and sleeve After Ndamama molding, cutting the molded body with the end face of the sleeve and the mandrel, made of a method which is characterized in that the removal by sliding the sleeve.
[0008]
Further, the apparatus for manufacturing an FRP cylinder according to the present invention is an apparatus for molding an FRP cylinder by winding a reinforcing fiber bundle impregnated with a resin around a mandrel, and mounting the mandrel on an end shaft of the mandrel. A resin having a flange portion having substantially the same diameter as the central portion in the axial direction of the mandrel, and an outer peripheral surface of the flange portion, which is formed of a needle-like body having a pointed tip and capable of penetrating and penetrating the resin-impregnated fiber bundle. A plurality of locking means for the impregnated fiber bundle are provided so as to protrude in the circumferential direction, and are configured to be slidable in the axial direction of the mandrel. It is characterized in that a sleeve formed with a diameter smaller than the central portion in the axial direction is provided.
[0009]
In the above apparatus preferably the relative rotation preventing mechanism is provided between the end shaft portion and the sleeve of the mandrel.
[0011]
[Action]
In the above-described method and apparatus for manufacturing an FRP cylinder according to the present invention, the resin impregnated reinforcing fiber bundle wound around the mandrel is locked and locked by the locking means attached to the end of the mandrel. In this state, the resin-impregnated reinforcing fiber bundle is folded back. The locking means is constituted by a needle-like body having a sharp tip, and as shown in FIG. 2 to be described later, can easily pierce and penetrate the wound resin-impregnated reinforcing fiber bundle. The fiber bundle can be easily locked, and the resin-impregnated reinforcing fiber bundle is folded back in the locked state. After being wound in a predetermined number of layers, the resin is cured while the locking means and the sleeve are rolled in. Even at the time of curing, the wound resin-impregnated reinforcing fiber bundle is locked at the end of the mandrel. The resin is hardened without releasing the winding tension at the time of filament winding since the resin is folded in the locked state. Therefore, even at the end of the mandrel, the fiber is hardened without disturbing the fiber and maintaining a predetermined orientation angle, the fiber volume content can be kept high, and the strength and the high-performance FRP cylinder having a high expression rate of elasticity can be obtained. The body is obtained.
[0012]
Then, after curing, the engaging means winding portion is separated by cutting the molded body between the sleeve and the end face of the mandrel, and is removed by sliding the sleeve, so that the FRP cylinder to be a product is formed. Has uniform properties over the entire length. In addition, by removing the engaging portion winding portion, the FRP cylindrical product portion can be easily finished to the target size.
[0013]
Since the locking means is provided on a sleeve slidable in the axial direction of the mandrel, for example, when removing the winding part, the winding part is easily removed together with the locking means and the sleeve. You. In addition, if the sleeve is formed to have a relatively long tubular portion, the folded portion of the resin-impregnated reinforcing fiber bundle is held on the outer periphery of the tubular portion, and is placed on the end shaft of the mandrel. The wrapping is avoided, so that the sleeve is easily detached together with the locking means wrap.
[0014]
In addition, by providing a relative rotation preventing mechanism between the end shaft portion of the mandrel and the sleeve, the rotational direction positional relationship between the locking means provided on the sleeve and the mandrel can be maintained even during rotation of the mandrel. The fixed positional relationship is always maintained, and the resin-impregnated reinforcing fiber bundle is stably and accurately folded at a desired folding position. Therefore, the performance at the end of the molded FRP cylinder is also maintained at the target performance.
[0015]
【Example】
Hereinafter, preferred embodiments of a method and an apparatus for manufacturing an FRP cylinder according to the present invention will be described with reference to the drawings.
1 to 3 show an apparatus for manufacturing an FRP cylinder according to one embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a creel stand on which a large number of bobbins 2 wound with reinforcing fiber yarns (for example, carbon fiber yarns) are installed. The reinforcing fiber yarns 3 drawn out from the bobbins 2 of the creel stand 1 are arranged in a predetermined number to form a reinforcing fiber bundle 4, which is sent to a separate roll 5. The reinforcing fibers are not limited to carbon fibers, and may be, for example, glass fibers, aramid fibers, and the like, and may be used in combination.
[0016]
In the present embodiment, the separate roll 5 includes a pair of free rotating rolls 6a and 6b extending substantially in the horizontal direction, and a pair of free rotating rolls 7a and 7b extending substantially vertically in the downstream side. Has become. The reinforcing fiber bundles 4 that have been roughly aligned in a predetermined cross-sectional shape by the separate rolls 5 are introduced into the resin impregnated bath 9 via the guide rolls 8 composed of free rotating rollers.
[0017]
An uncured resin 10 serving as a matrix resin of the FRP cylinder is accommodated in the resin impregnation bath 9. As the matrix resin, a thermosetting resin such as an epoxy resin, a phenol resin, a polyimide resin, a vinyl ester resin, and an unsaturated polyester resin is used. However, it is also possible to use other resins or thermoplastic resins such as polyamide, polycarbonate and polyetherimide.
[0018]
In the present embodiment, rollers 11a, 11b, and 11c that are driven to rotate or rotate freely are provided in the resin impregnation bath 9. The reinforcing fiber bundle 4 is sequentially guided on the rotating rollers 11a, 11b, and 11c, and the reinforcing fiber bundle 4 is impregnated with the resin 10 in the bus 9.
[0019]
The reinforcing fiber bundle impregnated with the resin 10, that is, the resin-impregnated reinforcing fiber bundle 12, is guided to the feed roller 14 by the guide means 13. In this embodiment, the guide means 13 comprises three guides 13a, 13b, 13c, and the resin-impregnated reinforcing fiber bundle 12 is guided on these guides 13a, 13b, 13c in order.
[0020]
In the present embodiment, among the plurality of guides 13a, 13b, 13c, the two guides 13a, 13b on the upstream side are configured as rotatable rollers, and the guide 13c on the downstream side (mandrel side) is configured as a fixed guide. Have been. However, the guides 13a and 13b may also be configured as fixed guides.
[0021]
Pads 15a and 15b made of, for example, rubber are provided on the rollers 13a and 13b, and the pads 15a and 15b are urged on the rollers 13a and 13b with an appropriate pressing force. The surface of the rollers 13a and 13b and the pads 15a and 15b are used to squeeze the resin-impregnated reinforcing fiber bundle 12 passing therethrough to squeeze out excess resin. However, if the excess resin can be sufficiently squeezed out using only the rollers 13a and 13b, the pads 15a and 15b are not necessarily required.
[0022]
The resin-impregnated reinforcing fiber bundle 12 from the guide means 13 is guided to the feed roller 14. In this embodiment, the feed roller 14 is composed of a pair of rollers 14a and 14b arranged in the feed direction of the resin-impregnated reinforcing fiber bundle 12. The pair of rollers 14 a and 14 b are rotatably supported by a bracket 16, and the bracket 16 is fixed on a cylinder 18 rotatably supported by a carriage stand 17. After the resin-impregnated reinforcing fiber bundle 12 is inserted through the hollow portion 18a of the cylinder 18, the resin-impregnated reinforcing fiber bundle 12 is fed onto the mandrel 19 via a pair of feed rollers 14a and 14b. The feed rollers 14a and 14b are moved in a direction along the rotation axis 19a of the mandrel 19 together with the cylinder 18 and the carriage stand 17.
[0023]
The mandrel 19 is rotationally driven at a predetermined rotational speed by a mandrel rotational driving means 20. The mandrel rotation driving means 20 is composed of, for example, a motor or a combination of a motor and a speed reducer. By winding a predetermined number of layers around the mandrel 19 at a predetermined angle, a resin-uncured FRP cylinder 21 is formed. By curing the resin, a molded product of the FRP cylinder 21 is obtained.
[0024]
In the embodiment apparatus configured as described above, a plurality of reinforcing fiber yarns 3 sent out from the creel stand 1 are aligned to form a reinforcing fiber bundle 4. After passing through the separate roll 5, the reinforcing fiber bundle 4 is introduced into the resin impregnation bath 9 via the guide roll 8. In the resin impregnation bath 9, the reinforcing fiber bundle 4 is impregnated with the resin 10 while being guided on the rollers 11a, 11b, 11c.
[0025]
The reinforcing fiber bundle 12 impregnated with the resin 10 is guided on guides 13a, 13b, and 13c in order, but first passes through between the rollers 13a, 13b and the pads 15a, 15b, so that an extra portion is formed in this portion. Resin is squeezed out. Then, by passing over the fixed guide 13c, the excess resin is squeezed out at this portion and the excess resin is efficiently squeezed out. The squeezed resin is returned to the resin impregnation bath 9 below.
[0026]
Since excess resin is squeezed out of the resin-impregnated reinforcing fiber bundle 12, the adhesive force of the resin-impregnated reinforcing fiber bundle 12 is appropriately reduced, and winding around the downstream feed rollers 14a and 14b is prevented.
[0027]
The resin-impregnated reinforcing fiber bundle 12 is further sent to the feed rollers 14a and 14b through the hollow portion 18a of the cylinder 18, and is sent from the feed roller 14b onto the mandrel 19. The winding on the mandrel 19 is performed as shown in FIG.
[0028]
In the method shown in FIG. 2, a sleeve 22 slidable in the axial direction of the mandrel 19 is mounted on an end shaft portion 19 b of the mandrel 19 (both end shaft portions in the present embodiment). As shown in the figure, a needle-like body 23 having a sharp tip is provided as locking means capable of locking the bundle 12. Flanges 22 a and 22 b are provided at both ends in the axial direction of the sleeve 22, and the outer diameter of the larger flange 22 a is formed to be substantially the same as the diameter of the central portion of the mandrel 19. . A plurality of needles 23 project from the outer peripheral surface of the flange portion 22a, and the needles 23 are arranged at a predetermined pitch in the circumferential direction. Central portion 22c between the two flange portions 22a, 22b of the sleeve 22 is cross-sectional shape of a circular periphery, a diameter smaller than the diameter of the central portion of the as shown mandrel 19, the receiving portion of the resin-impregnated reinforcing fiber bundles 12 Is composed.
[0029]
A relative rotation preventing mechanism is provided between the end shaft 19b of the mandrel 19 and the sleeve 22. In the present embodiment, as shown in FIG. 3, the relative rotation preventing mechanism is configured such that the cross-sectional shape of the end shaft portion 19b of the mandrel 19 is not completely circular but partially chord-shaped. The shape of the fitting hole 22d of the sleeve 22 is formed in a shape corresponding to the cross-sectional shape of the shaft portion 19b, and the two are fitted to each other. The chord-shaped notch 19c is formed at a predetermined distance from a central portion 19d of the mandrel 19, that is, a side surface of an axial end of a portion where a predetermined FRP cylinder 21 is to be formed. Therefore, a predetermined gap d is formed between the outer end surface of the flange portion 22a of the sleeve 22 fitted and mounted on the end shaft portion 19b of the mandrel 19 and the outer end surface of the mandrel central portion 19d. Has become.
[0030]
In a state where the sleeve 22 provided with the needle-like body 23 as the locking means is mounted on the end shaft 19b of the mandrel 19, as shown in FIG. 2, the resin impregnated on the mandrel 19 and the flange 22a. The reinforcing fiber bundle 12 is wound around a predetermined number of layers. The resin-impregnated reinforcing fiber bundle 12 is locked at the end of the mandrel 19 by piercing and penetrating the resin-impregnated reinforcing fiber bundle 12 being wound , as shown in the drawing. , And wound around the mandrel 19 as the next layer. In the folded portion, the resin-impregnated reinforcing fiber bundle overflows and accumulates outside the needle-like body 23, but this is held on the central receiving portion 22c of the sleeve 22, as shown in FIG. When a predetermined number of layers of the resin-impregnated reinforcing fiber bundle 12 are wound, the resin is cured while the sleeve 22 and the needle-like body 23 are wound. This curing may be performed while rotating the mandrel 19.
[0031]
After curing, a gap d between the central portion 19d of the mandrel 19 and the flange portion 22a of the sleeve 22, more precisely the gap d between the end surface of the mandrel 19 and the flange portion 22a of the sleeve 22, is shown by AA in FIG. As shown by the line, the molded body is cut off, and the separated sleeve 22 side portion is pulled out of the mandrel 19 together with the sleeve 22 and the needle-like body 23 by sliding the sleeve 22, and is removed. The resin-impregnated reinforcing fiber bundle overflowing at the folded portion is held on the sleeve 22, and the sleeve 22 has a fitting structure that can slide with respect to the shaft portion 19b of the mandrel 19. It is very easy even later.
[0032]
Further, the needle-like body 23 is integrally rotated with the mandrel 19 by the relative rotation preventing mechanism between the sleeve 22 and the shaft portion 19b of the mandrel 19, and the positional relationship between the two in the rotation direction is always kept constant. Therefore, the desired folded position of the resin-impregnated reinforcing fiber bundle 12 is always secured during winding. The relative rotation preventing mechanism is not limited to the above-described structure, and various known mechanisms such as a key and a key groove mechanism can be used.
[0033]
In the manufacture of the FRP cylinder as described above, the portion involving the locking means is removed after the resin is cured, so that the FRP cylinder as a product has uniform physical properties over the entire length. Also, since the filament winding is performed while being locked by the locking means, that is, while maintaining the winding tension, before the curing, the fiber at the end of the FRP cylinder to be formed is prevented from being disturbed, and And the state is maintained even after curing. Therefore, it is possible to form a uniform FRP cylinder having high strength and high elastic modulus. In addition, the fiber volume content of the FRP cylinder can be increased.
[0034]
In the above-described filament winding molding, when the resin-impregnated reinforcing fiber bundle 12 is wound around the mandrel 19, it is preferable to lower the temperature of the resin and increase its viscosity. If the viscosity of the resin is low, it is difficult to extrude the entrained voids (bubbles), but by increasing the viscosity and applying pressure in the radial direction, the voids can be easily discharged to the outside, and the quality is improved.
[0035]
That is, the thermosetting resin generally has characteristics as shown in FIG. 4 in an uncured state. When the resin is cured for molding, the temperature is increased to increase the viscosity as indicated by arrow B. However, in the above, the temperature is temporarily decreased and the viscosity is increased as indicated by arrow C for void discharge. is there. In order to lower the temperature, cold air may be blown onto the resin-impregnated reinforcing fiber bundle 12 immediately before winding on the mandrel. In addition, cooling by water injection is also possible.
[0036]
In the filament winding molding method, the resin-impregnated reinforcing fiber bundle 12 is wound around a mandrel 19 having a predetermined diameter, so that the formed FRP cylinder 21 is molded according to the inner diameter rule. In practice, the FRP cylinder 21 is often required so that the finished diameter of the outer diameter becomes a predetermined diameter. To achieve this, a method as shown in FIG.
[0037]
That is, a combination roller composed of a plurality of rollers 30 (three in the illustrated example) is provided on the outer surface of the FRP cylinder 21 in an uncured resin state formed on the mandrel 19, and a combination roller is provided on the surface of the FRP cylinder 21. The FRP cylinder 21 is caused to travel in a direction along the rotation axis while being pressed in the direction. At this time, since the mandrel 19 and the FRP cylinder 21 are rotating in the direction of the arrow, a slip occurs between the outer surface of the FRP cylinder 21 and the surface of each roller 30 in the circumferential direction of the FRP cylinder 21. . Each roller 30 has an arc surface corresponding to a target forming outer diameter (target finishing diameter) of the FRP cylinder 21 when viewed in a cross section including its own rotation axis.
[0038]
By pressing the combination roller 30 in this manner, the resin of the uncured FRP cylinder 21 is squeezed, and by adjusting the pressing force and the number of times of running on the surface of the FRP cylinder 21, molding of the outer diameter rule can be achieved. It is possible to accurately obtain a target outer diameter finish dimension. Further, the pressing of the roller 30 discharges the entangled void, and the strength of the molded FRP cylinder 21 is improved, thereby improving the quality.
[0039]
The surface finish of the roller 30 may be either a mirror finish or a satin finish, but a satin finish is more preferable in that a cut thread or the like is unlikely to be transferred to the roller surface.
[0040]
Further, as shown in FIG. 6, a ring 40 having an inner diameter corresponding to the target finish diameter of the FRP cylinder 21 can be run integrally with, for example, the carriage stand 17. The resin-impregnated reinforcing fiber bundle 12 is wound around the mandrel 19 while maintaining a predetermined angle with the ring 40. The resin-impregnated reinforcing fiber bundle 12 is wound while the resin is squeezed by the ring 40, and the entrainment of air is suppressed. Further, when the outer diameter of the uncured FRP tubular body 21 being formed becomes close to the target diameter, even if a part partially exceeds the target diameter occurs, the part is squeezed by the ring 40 and is reduced to the target diameter. Since it can be accommodated, it is finally possible to form the outer diameter rule, and the target finishing diameter can be accurately obtained.
[0041]
【The invention's effect】
As described above, according to the present invention, a mandrel at a predetermined winding angle without locking the thus resin-impregnated reinforcing fiber bundle with the locking means comprising a needle body provided on the sleeve, disturbing After the resin is cured, the locking means wrapped portion is removed together with the sleeve, so that the FRP cylinder as a product has uniform physical properties over the entire length, and has high strength and high strength. It is possible to obtain an FRP cylinder having an elastic modulus, and it is possible to obtain an FRP cylinder whose end is finished to a desired accuracy.
[0042]
In addition, the removal of the above-mentioned engaging means winding portion can be easily performed by sliding the sleeve, so that productivity and work efficiency can be improved.
[0043]
The method and apparatus for producing an FRP cylinder according to the present invention, which can provide an FRP cylinder having such excellent performance, and have high productivity and high work efficiency, are capable of producing a FRP propeller shaft or an FRP roll. It is very useful when applied to manufacturing.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of an apparatus for manufacturing an FRP cylinder according to one embodiment of the present invention.
FIG. 2 is a partially enlarged longitudinal sectional view of a mandrel end showing a state of forming an FRP cylinder of the apparatus of FIG. 1;
FIG. 3 is an enlarged cross-sectional view taken along the line III-III of FIG. 2;
FIG. 4 is a diagram illustrating the relationship between the temperature and the viscosity of an uncured thermosetting resin.
FIG. 5 is a schematic longitudinal sectional view showing a preferred method of forming an FRP cylinder on a mandrel.
FIG. 6 is a partial schematic perspective view showing another preferred method of forming a FRP cylinder on a mandrel.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Creel stand 2 Bobbin 3 Reinforcing fiber yarn 4 Reinforcing fiber bundle (before resin impregnation)
5, 6a, 6b, 7a, 7b Separate roll 8 Guide roll 9 Resin impregnated bath 10 Resin 11a, 11b, 11c Roller 12 Resin impregnated reinforcing fiber bundle 13 Guide means 13a, 13b, 13c Guide 14, 14a, 14b Feed roller 15a 15b Pad 16 Bracket 17 Carriage stand 18 Cylinder 18a Hollow part 19 Mandrel 19a Mandrel rotation shaft 19b Mandrel end shaft 19c Chordal cutout 19d of mandrel end shaft 19d Center part of mandrel 20 Rotation driving means 21 FRP Tube 22 Sleeve 22a, 22b Flange 22c Central part (receiving part)
22d hole 23 needle 30 as locking means roller 40 ring

Claims (3)

After winding the reinforcing fiber bundle impregnated with the resin on the mandrel, and curing the resin to form an FRP cylinder, a flange portion having substantially the same diameter as the axial center portion of the mandrel is provided at the end shaft portion of the mandrel. A plurality of locking means of a resin-impregnated fiber bundle made of a needle-like body that has a sharpened tip and pierces and penetrates the resin-impregnated fiber bundle is provided on the outer peripheral surface of the flange portion in the circumferential direction, and A sleeve, which is configured to be slidable in the axial direction of the mandrel, and has a diameter that is smaller than the axially central portion of the mandrel in the axially central portion of the mandrel adjacent to the flange , is attached to the sleeve. After the resin impregnated reinforcing fiber bundle is wound around the stopping means and the sleeve, and formed while the locking means and the sleeve are being wound, forming is performed between the sleeve and the end face of the mandrel. Body was cut, and removing by sliding the sleeve, the production method of the FRP cylinder. In a device in which a reinforcing fiber bundle impregnated with a resin is wound around a mandrel and then the resin is cured to form an FRP cylinder , substantially the same as the axial center portion of the mandrel attached to the end shaft portion of the mandrel A plurality of locking means for the resin-impregnated fiber bundle formed of a needle-like body having a sharp tip and penetrating and penetrating the resin-impregnated fiber bundle are provided on the outer peripheral surface of the flange portion in a circumferential direction. And a sleeve that is configured to be slidable in the axial direction of the mandrel , and that has a smaller diameter than the axially central portion of the mandrel in the axially central portion of the mandrel adjacent to the flange. An apparatus for manufacturing an FRP cylinder, wherein the apparatus is provided. The apparatus for manufacturing an FRP cylinder according to claim 2 , wherein a relative rotation preventing mechanism is provided between an end shaft portion of the mandrel and the sleeve.

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