JP2008238566A - Method of manufacturing fiber-reinforced resin structure and fiber-reinforced resin structure - Google Patents

Method of manufacturing fiber-reinforced resin structure and fiber-reinforced resin structure Download PDF

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JP2008238566A
JP2008238566A JP2007082018A JP2007082018A JP2008238566A JP 2008238566 A JP2008238566 A JP 2008238566A JP 2007082018 A JP2007082018 A JP 2007082018A JP 2007082018 A JP2007082018 A JP 2007082018A JP 2008238566 A JP2008238566 A JP 2008238566A
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core material
hollow body
reinforced resin
fiber
fiber reinforced
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Takao Tsukimori
隆雄 月森
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Toyota Motor Corp
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<P>PROBLEM TO BE SOLVED: To provide a method of manufacturing a fiber-reinforced resin structure capable of forming a fiber-reinforced resin layer around a core material in a void-free state and following even a complicated final shape. <P>SOLUTION: The method has the process of laying a core material 12 around an expandable hollow material 11, the process of laminating a prepreg 15 having an unhardened resin 15a and a reinforcing fiber 15b around the core material to cover the core material 15, the process of laying the core material 12 laminated and covered with the prepreg 15 in a cavity 4 of a mold 1 and causing the hollow material 11 to expand within the cavity 4 of the mold 1 so as to pressurize the unhardened resin 15a and the reinforcing fiber 15b between the mold 1 and the core material 11 and the process of heating the pressurized unhardened resin and reinforcing fiber to harden the resin 15a so as to form a fiber-reinforced resin layer 16 around the core material 12. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、繊維強化樹脂構造体の製造方法と、繊維強化樹脂構造体に係り、特に、成形型を用いてプリプレグを加圧して成形する繊維強化樹脂構造体の製造方法と、繊維強化樹脂構造体に関する。   The present invention relates to a method for producing a fiber reinforced resin structure and a fiber reinforced resin structure, and more particularly, to a method for producing a fiber reinforced resin structure in which a prepreg is molded by using a mold and a fiber reinforced resin structure. About the body.

従来の繊維強化樹脂構造体、いわゆるFRP構造体は、強化繊維と樹脂とを少なくとも含む繊維強化樹脂を有する構造体である。該構造体は、機械強度を維持しつつ、軽量化を図るべき箇所に使用されるものである。このようなFRP構造体の繊維強化樹脂は、強化繊維に樹脂を含浸させることにより、少なくともFRP構造体の表面に成形される。   A conventional fiber reinforced resin structure, so-called FRP structure, is a structure having a fiber reinforced resin including at least a reinforced fiber and a resin. The structure is used in a place where weight reduction should be achieved while maintaining mechanical strength. Such a fiber reinforced resin of the FRP structure is molded at least on the surface of the FRP structure by impregnating the reinforced fiber with the resin.

たとえば、このようなFRP構造体は、多面体(たとえば四角柱)状のコア材の表面に、強化繊維と樹脂(プリプレグ)を配置した状態で、成形型内に配置し、該コア材を含むプリプレグを加圧及び加熱によるプレス成形を利用して、繊維強化樹脂層としてコア材に一体成形することにより製造される。   For example, such an FRP structure is arranged in a mold in a state where reinforcing fibers and a resin (prepreg) are arranged on the surface of a polyhedral (for example, quadrangular prism) core material, and includes the core material. This is manufactured by integrally forming a core material as a fiber reinforced resin layer using press molding by pressing and heating.

また別の方法としては、前記FRP構造体の製造方法として、中空体と、該中空体の周囲に配置されたFRP層とを有するFRP構造体の製造方法が提案されている。該製造方法では、発泡液を中に有した中空体の少なくとも一面に強化繊維基材を配置後、成形型内に配置し、全体をバッグ基材で覆った後、バッグ基材で覆われた型内部を真空状態にし、樹脂を注入して樹脂を強化繊維基材の面方向に拡散させつつ厚み方向に含浸することにより成形している(例えば、特許文献1参照)。そして、このような成形方法によれば、前記FRP層は、型内を真空状態にし、かつ中空体内に発泡液を用いることにより、強化繊維基材に樹脂を効率良く含浸させることができる。   As another method for manufacturing the FRP structure, a method for manufacturing an FRP structure having a hollow body and an FRP layer disposed around the hollow body has been proposed. In the manufacturing method, after the reinforcing fiber base material is disposed on at least one surface of the hollow body having the foamed liquid therein, the reinforcing fiber base material is disposed in the mold, and the whole is covered with the bag base material, and then covered with the bag base material. The inside of the mold is evacuated, and the molding is performed by injecting the resin and impregnating the resin in the thickness direction while diffusing the resin in the surface direction of the reinforcing fiber base (for example, see Patent Document 1). And according to such a shaping | molding method, the said FRP layer can make the inside of a type | mold vacuum state, and can impregnate a reinforced fiber base material with resin efficiently by using a foaming liquid in a hollow body.

特開2000−79649号公報JP 2000-79649 A

しかし、前記プレス成形による方法では、FRP構造体が直方体等の角部を有する形状の場合、あるいはFRP構造体の最終形状が複雑な形状の場合、角部や複雑な形状に追従することが難しく、加圧を均一にFRP構造体へ加えることができず、品質が低下するおそれがあった。そのため、均一加圧ができるような構造に、FRP構造体の形状は制約され、成形型の形状は複雑なものになってしまう。   However, in the method by press molding, when the FRP structure has a shape having a corner such as a rectangular parallelepiped or when the final shape of the FRP structure is a complicated shape, it is difficult to follow the corner and the complicated shape. , The pressure could not be uniformly applied to the FRP structure, and the quality could be deteriorated. For this reason, the shape of the FRP structure is restricted to a structure capable of uniform pressurization, and the shape of the mold becomes complicated.

また、特許文献1に記載の前記製造方法は、真空引きを利用して強化繊維内の脱気をすると共に樹脂を型内に注入することにより成形を行っている。また、該成形時には、発泡液を発泡させて、該発泡による均一な加圧力により強化繊維基材に樹脂を均一に含浸させようとしている。しかし、強化繊維基材の形状は複雑であり、前記真空引きを行った場合であっても、前記中空体の形状を確保した状態で、強化繊維内の樹脂を完全に脱気することは難しい。さらに、一端、樹脂が含浸した状態の強化繊維内のガスを、前記発泡による加圧力で脱気することは難しい。その結果、強化繊維基材に樹脂が均一に含浸されず、ボイドが残留することがあり、良好な成形物を得ることができないおそれがあった。   Moreover, the said manufacturing method of patent document 1 is shape | molded by inject | pouring resin into a type | mold while deaeration in a reinforced fiber using vacuum drawing. Further, at the time of molding, the foaming liquid is foamed, and the reinforcing fiber base material is uniformly impregnated with the resin by the uniform pressure applied by the foaming. However, the shape of the reinforcing fiber base is complicated, and it is difficult to completely deaerate the resin in the reinforcing fiber in a state in which the shape of the hollow body is ensured even when the evacuation is performed. . Furthermore, it is difficult to degas the gas in the reinforced fiber impregnated with resin at one end by the pressure applied by the foaming. As a result, the reinforcing fiber base material is not uniformly impregnated with the resin, and voids may remain, and a good molded product may not be obtained.

本発明は、前記のような問題に鑑みてなされたものであって、その目的とするところは、コア材の周囲に未硬化の樹脂と強化繊維とを有するプリプレグを配置し、プリプレグを加圧してコア材の周囲にボイドの無い状態で繊維強化樹脂層を成形することができ、複雑な最終形状にも追従できる繊維強化樹脂構造体の製造方法と、繊維強化樹脂構造体を提供することにある。   The present invention has been made in view of the above-described problems, and an object thereof is to place a prepreg having uncured resin and reinforcing fibers around a core material, and pressurize the prepreg. To provide a fiber-reinforced resin structure manufacturing method and a fiber-reinforced resin structure capable of forming a fiber-reinforced resin layer without voids around the core material and capable of following a complicated final shape. is there.

前記目的を達成すべく、本発明に係る繊維強化樹脂構造体の製造方法は、膨張性を有した中空体の周囲にコア材を配置する工程と、配置されたコア材の周囲に未硬化の樹脂と強化繊維とを有するプリプレグを積層して被覆する工程と、プリプレグが積層、被覆されたコア材を成形型のキャビティ内に配置する工程と、成形型のキャビティ内において中空体を膨張させて、成形型とコア材の間において未硬化の樹脂及び強化繊維を加圧する工程と、加圧された未硬化の樹脂及び強化繊維を加熱して硬化させコア材の周囲に繊維強化樹脂層を成形する工程と、を少なくとも含むことを特徴としている。   In order to achieve the above object, a method for producing a fiber reinforced resin structure according to the present invention includes a step of arranging a core material around a hollow body having expandability, and an uncured around the arranged core material. A step of laminating and coating a prepreg having a resin and a reinforcing fiber, a step of placing a core material coated and coated with the prepreg in a mold cavity, and expanding a hollow body in the cavity of the mold , Pressing the uncured resin and reinforcing fibers between the mold and the core material, and heating and curing the pressurized uncured resin and reinforcing fibers to form a fiber reinforced resin layer around the core material And at least a step of performing.

本発明の繊維強化樹脂構造体の製造方法によれば、中空体の周囲にコア材を配置し、コア材の周囲にプリプレグを積層して被覆し、プリプレグが積層、被覆されたコア材を成形型のキャビティ内に配置し、キャビティ内において中空体を膨張させて、成形型とコア材の間において未硬化の樹脂及び強化繊維を加圧すると、コア材の中空部が膨張してコア材を介して、プリプレグを成形型の内面に押し付ける。このため、プリプレグの未硬化の樹脂と強化繊維との間の空気が押し出され、ボイドが残留することを防止できる。また、中空体は等方性をもって膨張しようとするので、コア材を介してコア材周りのプリプレグを均一に加圧する。このような均一な加圧により、これまでのプレス成形のように均一加圧を考慮すべく成形型の形状を制限する必要なはいので、所望の形状の繊維強化樹脂構造体を得ることができる。   According to the method for producing a fiber-reinforced resin structure of the present invention, a core material is arranged around a hollow body, a prepreg is laminated around the core material, and the core material is formed by laminating and coating the prepreg. When it is placed in the cavity of the mold, the hollow body is expanded in the cavity, and the uncured resin and reinforcing fiber are pressed between the mold and the core material, the hollow portion of the core material expands and the core material is expanded. The prepreg is pressed against the inner surface of the mold. For this reason, the air between the uncured resin of the prepreg and the reinforcing fibers is pushed out, and it is possible to prevent the voids from remaining. Moreover, since the hollow body tends to expand with isotropic property, the prepreg around the core material is uniformly pressurized through the core material. With such uniform pressing, it is not necessary to limit the shape of the molding die so as to consider uniform pressing as in conventional press molding, so a fiber-reinforced resin structure having a desired shape can be obtained. .

また、本発明にいう「膨張性を有した中空体」とは、減圧、加熱等をすることにより中空体の体積が膨張する中空体をいい、中空体に熱膨張可能な気体、液体、又は固体等を封入してもよく、外部から、中空体を膨張させるように、気体、液体、又は固体を強制的に送り込むように構成されていてもよい。   In addition, the “expandable hollow body” in the present invention refers to a hollow body in which the volume of the hollow body expands by decompression, heating, etc., and a gas, liquid, or A solid or the like may be enclosed, and a gas, a liquid, or a solid may be forcibly fed from the outside so as to expand the hollow body.

また、本発明に係る繊維強化樹脂構造体の製造方法の好ましい具体的な態様としては、前記コア材を配置する工程において、コア材として、複数のコア片から構成されたコア材を用いることを特徴としている。この製造方法によれば、中空体が膨張したとき複数のコア片から構成されるコア材によりプリプレグが均一に加圧され、プリプレグの未硬化の樹脂が強化繊維に含浸してコア材と一体化され、ボイドが除去された繊維強化樹脂層が成形される。さらに、成形型が複雑な形状でも、該形状に追従しやすくなり、品質の高い成形品を製造することができる。   Moreover, as a preferable specific aspect of the method for producing a fiber-reinforced resin structure according to the present invention, in the step of arranging the core material, a core material composed of a plurality of core pieces is used as the core material. It is a feature. According to this manufacturing method, when the hollow body expands, the prepreg is uniformly pressed by the core material composed of a plurality of core pieces, and the uncured resin of the prepreg is impregnated into the reinforcing fiber and integrated with the core material. Then, the fiber reinforced resin layer from which the void is removed is formed. Furthermore, even if the molding die has a complicated shape, it becomes easy to follow the shape, and a high-quality molded product can be manufactured.

さらに、前記コア材として、中空体の周囲にコア材を配置したときに中空多面体が形成されるコア材を用い、該コア材を構成する複数のコア片の各コア片として、中空多面体の各稜に沿って複数に分割されるコア片を用いることが好ましい。この製造方法によれば、中空体の周囲に配置されたコア材の各コア片は、少なくとも中空体と接触する面と、プリプレグを加圧する面とを備えており、しかも、この加圧面は中空多面体の各稜まで延在しており、中空多面体を被覆するプリプレグのすべての領域をコア材の外周面で加圧することができるため、均一に加圧することができ、ボイドの残留を防止することが可能となる。さらに、繊維強化樹脂構造体の最終形状が複雑であっても、その最終形状となるように繊維強化樹脂構造体を正確に成形することができ、品質を高めることができる。   Further, as the core material, a core material in which a hollow polyhedron is formed when the core material is arranged around the hollow body, and each core piece of a plurality of core pieces constituting the core material is used as each core piece of the hollow polyhedron. It is preferable to use a core piece divided into a plurality along the ridge. According to this manufacturing method, each core piece of the core material disposed around the hollow body includes at least a surface that comes into contact with the hollow body and a surface that pressurizes the prepreg. Since it extends to each ridge of the polyhedron and all the area of the prepreg that covers the hollow polyhedron can be pressurized with the outer peripheral surface of the core material, it can be uniformly pressurized and prevent voids from remaining Is possible. Furthermore, even if the final shape of the fiber reinforced resin structure is complicated, the fiber reinforced resin structure can be accurately molded so as to have the final shape, and the quality can be improved.

また、前記膨張性を有した中空体として、内部に気体が密封された中空体を用い、加圧工程において、未硬化の樹脂及び強化繊維の加圧を、キャビティ内を減圧及び/又は加熱することにより行うことが好ましい。このように構成された製造方法によれば、キャビティ内を減圧及び/又は加熱すると、中空体の内部に密封された気体が膨張し、コア材を介してプリプレグの樹脂及び強化繊維を加圧し、キャビティ内面にプリプレグを押し付けた状態で加熱して硬化させ繊維強化樹脂層を成形するため、成形される繊維強化樹脂構造体の最終形状が複雑な場合でも正確に成形することができる。   Moreover, as the hollow body having the expandability, a hollow body in which a gas is sealed is used, and in the pressurizing step, the uncured resin and the reinforcing fiber are pressurized, and the inside of the cavity is decompressed and / or heated. It is preferable to do so. According to the manufacturing method configured as described above, when the inside of the cavity is decompressed and / or heated, the gas sealed inside the hollow body expands, and the resin and the reinforcing fiber of the prepreg are pressurized through the core material, Since the fiber-reinforced resin layer is formed by heating and curing in a state where the prepreg is pressed against the inner surface of the cavity, the fiber-reinforced resin structure to be formed can be accurately formed even when the final shape is complicated.

さらに、前記膨張性を有した中空体として、内部に、少なくとも加熱により膨張する膨張剤が封入された中空体を用い、前記加圧工程において、未硬化の樹脂及び強化繊維の加圧を、キャビティ内を膨張剤が膨張可能な温度領域まで加熱することにより行うことが好ましい。膨張剤としては、重曹等を好適に用いることができる。このように構成された製造方法によれば、中空体内部に封入された膨張剤を膨張可能な温度まで加熱して膨張させ、コア材を外方に加圧することでプリプレグをキャビティ内面に押し付けるように加圧することができ、複雑な最終形状でも正確に成形することができる。   Further, as the hollow body having the expandability, a hollow body in which an expansion agent that expands at least by heating is enclosed is used, and in the pressurizing step, the uncured resin and the reinforcing fibers are pressurized by a cavity. It is preferable to carry out the heating by heating the inside to a temperature range where the expansion agent can expand. As the swelling agent, sodium bicarbonate or the like can be suitably used. According to the manufacturing method configured as described above, the expansion agent enclosed in the hollow body is heated to expand to a temperature capable of expansion, and the core material is pressed outward to press the prepreg against the cavity inner surface. Pressure, and even a complicated final shape can be accurately formed.

また、前記未硬化の樹脂は、熱硬化性樹脂からなり、中空体の膨張を熱硬化性樹脂の硬化温度より低い加熱温度条件で行うことが好ましい。このように構成された製造方法によれば、熱硬化性樹脂の硬化温度より低い温度で中空体が膨張するため、プリプレグが硬化する前の、柔らかい未硬化の状態でコア材により加圧され、複雑な形状でも追従できて精度のよい成形品を製造できる。   The uncured resin is preferably made of a thermosetting resin, and the hollow body is preferably expanded under a heating temperature condition lower than the curing temperature of the thermosetting resin. According to the manufacturing method configured as described above, the hollow body expands at a temperature lower than the curing temperature of the thermosetting resin, so that it is pressurized by the core material in a soft uncured state before the prepreg is cured, Even a complicated shape can be followed, and an accurate molded product can be manufactured.

本発明に係る繊維強化樹脂構造体は、膨張性を有した中空体と、中空体の周囲に、成形された繊維強化樹脂層とを備え、繊維強化樹脂構造体の中空体と繊維強化樹脂層との間には、さらに膨張性を有したコア材が形成されており、繊維強化樹脂層は、中空体及びコア材が膨張した状態で、加熱により硬化した樹脂と強化繊維とを有することを特徴としている。   The fiber-reinforced resin structure according to the present invention includes a hollow body having expandability, and a molded fiber-reinforced resin layer around the hollow body, and the hollow body of the fiber-reinforced resin structure and the fiber-reinforced resin layer Further, an expandable core material is formed between the fiber reinforced resin layer and the fiber reinforced resin layer having a resin and a reinforced fiber cured by heating in a state where the hollow body and the core material are expanded. It is a feature.

このように構成された繊維強化樹脂構造体によれば、成形時に中空体が膨張した状態、すなわちコア材が樹脂と強化繊維とを加圧した状態で、樹脂を硬化させ、コア材と繊維強化樹脂層を一体化するような成形方法で製造することができる。このような製造方法により繊維強化樹脂構造体は製造できるのでコア材と繊維強化樹脂層との間、あるいは樹脂と強化繊維との間にボイド、いわゆる空泡が残留し難く、繊維強化樹脂構造体の強度を高めることができる。また、製造時に、中空体を等方性をもって膨張させることが可能であるので、コア材は複雑な形状のキャビティに対しても追従できるので、成形される製品形状は制約を受け難い。さらに、コア材を繊維強化樹脂構造体に設けることにより、コア材が繊維強化樹脂構造体の基本骨格となるため、所望の最終形状に、繊維強化樹脂構造体を成形しやすくなる。   According to the fiber reinforced resin structure thus configured, the resin is cured in a state where the hollow body is expanded at the time of molding, that is, in a state where the core material pressurizes the resin and the reinforcing fiber, and the core material and the fiber reinforced It can be manufactured by a molding method in which the resin layers are integrated. Since a fiber reinforced resin structure can be manufactured by such a manufacturing method, voids, so-called air bubbles hardly remain between the core material and the fiber reinforced resin layer, or between the resin and the reinforced fiber, and the fiber reinforced resin structure. The strength of can be increased. In addition, since the hollow body can be expanded isotropically at the time of manufacture, the core material can follow even a complicatedly shaped cavity, so that the shape of the molded product is not easily restricted. Furthermore, by providing the core material in the fiber reinforced resin structure, the core material becomes a basic skeleton of the fiber reinforced resin structure, and thus the fiber reinforced resin structure can be easily formed into a desired final shape.

本発明の繊維強化樹脂構造体の製造方法、及び繊維強化樹脂構造体は、コア材の内部に位置する中空体が膨張した状態で、コア材と繊維強化樹脂層が一体化されて繊維強化樹脂構造体が形成されるため、コア材と繊維強化樹脂層との間、あるいは樹脂と強化繊維との間にボイドが残留することが少なく、複雑な最終形状にも追従して高品質の繊維強化樹脂構造体を成形して製造することができる。   The method for producing a fiber reinforced resin structure of the present invention and the fiber reinforced resin structure are obtained by integrating a core material and a fiber reinforced resin layer in a state where a hollow body located inside the core material is expanded. Since a structure is formed, there are few voids remaining between the core material and the fiber reinforced resin layer, or between the resin and the reinforced fiber, and high-quality fiber reinforcement follows the complicated final shape. The resin structure can be molded and manufactured.

以下、本発明に係る繊維強化樹脂構造体の製造方法と、繊維強化樹脂構造体の一実施形態を図面に基づき詳細に説明する。図1は、本実施形態に係る繊維強化樹脂構造体(FRP構造体)の製造方法で使用される成形型の断面図を含む製造装置の構成図、図2は、図1の成形型を用いて成形された繊維強化樹脂構造体の断面図である。   Hereinafter, an embodiment of a method for producing a fiber reinforced resin structure and a fiber reinforced resin structure according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a configuration diagram of a manufacturing apparatus including a cross-sectional view of a mold used in the method for manufacturing a fiber reinforced resin structure (FRP structure) according to this embodiment, and FIG. 2 uses the mold of FIG. It is sectional drawing of the fiber reinforced resin structure shape | molded by the above.

先ず、本実施形態の繊維強化樹脂構造体をプレス成形で成形する成形型について図1を参照して説明する。成形型1は上型2と下型3とから構成され、下型3のキャビティ4内に上型2の突部が進入してキャビティ内の容積を縮小させることができるように、下型3に対して上型2が移動可能に嵌合されている。そして、上型2と下型3との嵌合部分は、移動中を含めて気密が保たれている。この構成により、キャビティ4内は密閉された空間となっている。そして、キャビティ4の内周面は、製造される繊維強化樹脂構造体の最終形状に沿うような形状に形成されている。   First, a mold for molding the fiber-reinforced resin structure of the present embodiment by press molding will be described with reference to FIG. The mold 1 is composed of an upper mold 2 and a lower mold 3, and the lower mold 3 is configured so that the protrusion of the upper mold 2 enters the cavity 4 of the lower mold 3 and the volume in the cavity can be reduced. On the other hand, the upper die 2 is movably fitted. And the fitting part of the upper mold | type 2 and the lower mold | type 3 is airtight also including during movement. With this configuration, the cavity 4 is a sealed space. And the internal peripheral surface of the cavity 4 is formed in the shape which follows the final shape of the fiber reinforced resin structure manufactured.

キャビティ4内は成形品の収容スペースであり、本実施形態ではキャビティ内に、中空体を内装するコア材やプリプレグ等を収容する。そして、成形型1は、上型2を嵌合させて収容スペースであるキャビティを密閉し、上型2を下降させてキャビティ4内において後述するプリプレグを加圧したあと、プリプレグを硬化させ樹脂成形品を成形することができるように構成されている。成形型1は、下型3の側面にキャビティ4内に連通するパイプ5が接続され、このパイプには開閉弁6を介して真空ポンプ等の減圧装置7が接続されている。この構成により、成形型1はキャビティ4内の空気を吸引して減圧状態、あるいは真空状態とすることができる構成となっている。なお、開閉弁は必ずしも必要でなく、減圧装置を直接パイプに接続してもよい。   The cavity 4 is a space for accommodating a molded product. In this embodiment, a core material, a prepreg, or the like that houses a hollow body is accommodated in the cavity. Then, the molding die 1 is fitted with the upper die 2 to seal the cavity which is the accommodation space, and the upper die 2 is lowered to pressurize a prepreg which will be described later in the cavity 4, and then the prepreg is cured to be resin molded. It is comprised so that a product can be shape | molded. In the molding die 1, a pipe 5 communicating with the inside of the cavity 4 is connected to the side surface of the lower die 3, and a decompression device 7 such as a vacuum pump is connected to the pipe via an on-off valve 6. With this configuration, the mold 1 is configured so that the air in the cavity 4 can be sucked into a reduced pressure state or a vacuum state. Note that the on-off valve is not always necessary, and the pressure reducing device may be directly connected to the pipe.

前記のように構成された成形型1を用いて繊維強化樹脂構造体を成形する製造方法について以下に説明する。この実施形態で成形される繊維強化樹脂構造体10は、膨張性を有した中空体11の周囲にコア材12を配置し、芯となるコア材12の周囲に未硬化の樹脂15aと強化繊維15bとを有するプリプレグ15を配置し、コア材12を膨張させてプリプレグ15を加圧したあと硬化させて繊維強化樹脂層16を形成し、コア材12と繊維強化樹脂層16を一体化させて成形したものである。すなわち、コア材12の外周全面をプリプレグ15で被覆し、プリプレグ15を加圧すると共に硬化させて繊維強化樹脂層16をコア材12の外周に形成し、繊維強化樹脂構造体10を成形する。   The manufacturing method which shape | molds a fiber reinforced resin structure using the shaping | molding die 1 comprised as mentioned above is demonstrated below. In the fiber reinforced resin structure 10 molded in this embodiment, a core material 12 is arranged around a hollow body 11 having expandability, and an uncured resin 15a and a reinforced fiber are provided around the core material 12 serving as a core. Prepreg 15 having 15b is disposed, the core material 12 is expanded, the prepreg 15 is pressurized and then cured to form the fiber reinforced resin layer 16, and the core material 12 and the fiber reinforced resin layer 16 are integrated. Molded. That is, the entire outer periphery of the core material 12 is covered with the prepreg 15, the prepreg 15 is pressurized and cured to form the fiber reinforced resin layer 16 on the outer periphery of the core material 12, and the fiber reinforced resin structure 10 is molded.

本実施形態の製造方法では、第1の工程として、膨張性を有した中空体11の周囲に、コア材12を配置する。繊維強化樹脂構造体10の芯となる中空体11と、コア材12について説明する。中空体11は、ナイロン等の軟質な樹脂で形成された風船状のバルーンが使用される。中空体11の内部には大気圧以上の気体、例えば空気が封入されており、しぼんだ状態でなく、膨張した状態でコア材12の内部に内蔵されている。封入される気体としては、空気の他に、窒素、あるいは不活性ガス等の安定したガスが好ましい。   In the manufacturing method of this embodiment, the core material 12 is arrange | positioned around the hollow body 11 which has expansibility as a 1st process. The hollow body 11 used as the core of the fiber reinforced resin structure 10 and the core material 12 will be described. As the hollow body 11, a balloon-like balloon made of a soft resin such as nylon is used. The hollow body 11 is filled with a gas at atmospheric pressure or higher, such as air, and is contained in the core material 12 in an expanded state, not in a deflated state. As the gas to be sealed, in addition to air, stable gas such as nitrogen or inert gas is preferable.

コア材12は、可撓性を有し膨張可能な多孔質の樹脂、例えば発泡樹脂から形成され、その外形は、成形される繊維強化樹脂構造体10の最終形状となるように形成されている。可撓性を有するコア材12は、中空体11と共に膨張(拡大)可能であり、コア材12は、中空体11の周囲に配置される。この実施形態のコア材12は、内部が密閉空間である直方体状の中空体11の周囲に、例えば発泡樹脂層を所定の厚みで形成し、中空体11とコア材12とが一体化されて形成されている。   The core material 12 is formed of a flexible and expandable porous resin, for example, a foamed resin, and the outer shape thereof is formed to be the final shape of the fiber reinforced resin structure 10 to be molded. . The core material 12 having flexibility can be expanded (expanded) together with the hollow body 11, and the core material 12 is disposed around the hollow body 11. In the core material 12 of this embodiment, for example, a foamed resin layer is formed with a predetermined thickness around a rectangular parallelepiped hollow body 11 whose inside is a sealed space, and the hollow body 11 and the core material 12 are integrated. Is formed.

つぎに、第2の工程として、中空体11の周囲に配置されたコア材12の周囲に、未硬化の樹脂15aと強化繊維15bとを有するプリプレグ15を積層して被覆する。プリプレグ15は、未硬化の熱硬化性樹脂からなる樹脂15aと、カーボンファイバ等の強化繊維15bとを積層した構造となっている。プリプレグ15は強化繊維15bに樹脂15aが予め含浸されたものでも、含浸されず積層されたものでもよい。なお、本実施形態では、強化繊維15bを二層(図1の破線部参照)有しているが、これらの層数は特に限定されるものではない。また、本実施形態では、予めは強化繊維15bと樹脂15aとを積層したプリプレグ15を使用したが、コア材の表面に、強化繊維とフィルム状の樹脂を順次積層させてもよい。   Next, as a second step, a prepreg 15 having an uncured resin 15a and reinforcing fibers 15b is laminated and covered around the core material 12 arranged around the hollow body 11. The prepreg 15 has a structure in which a resin 15a made of an uncured thermosetting resin and a reinforcing fiber 15b such as a carbon fiber are laminated. The prepreg 15 may be one in which the reinforcing fiber 15b is impregnated with the resin 15a in advance or may be laminated without impregnation. In addition, in this embodiment, although it has two layers (refer the broken-line part of FIG. 1), the number of these layers is not specifically limited. In this embodiment, the prepreg 15 in which the reinforcing fibers 15b and the resin 15a are laminated in advance is used. However, the reinforcing fibers and the film-like resin may be sequentially laminated on the surface of the core material.

このあと、第3の工程として、プリプレグ15が積層、被覆されたコア材12を、成形型1のキャビティ4内に配置する。そして、キャビティの上部開口に上型2の突部を嵌合させ、矢印xのように下方に加圧する。このように、下型3に上型2を被せて嵌合させ、型締めすることでキャビティ4内は密閉空間となる。   Thereafter, as a third step, the core material 12 laminated and covered with the prepreg 15 is placed in the cavity 4 of the mold 1. Then, the protrusion of the upper mold 2 is fitted into the upper opening of the cavity and pressed downward as indicated by an arrow x. In this way, the upper die 2 is put on the lower die 3 and fitted, and the cavity 4 is sealed to form a sealed space.

ついで、第4の工程として、成形型1のキャビティ4内において中空体11を膨張させて、成形型1とコア材12の間において未硬化の樹脂15aと、強化繊維15bとを加圧する。具体的には、パイプ5の開閉弁6を開いた状態で減圧装置7を作動させると、キャビティ4内の空気は吸引され、キャビティ4内は減圧状態となる。この結果、コア材12の内部の中空体11は膨張し、コア材12を内側から外方に向けて矢印yのように均等に押圧する。これにより、未硬化の樹脂15aと強化繊維15bとを有するプリプレグ15は、コア材12により下型3の内周面、及び上型2の下端面に均等に押圧され、プリプレグ15を外周に向けて加圧する。なお、中空体11の膨張時には、上型2の位置は固定されているか、上型2を下型3に向かって加圧する。   Next, as a fourth step, the hollow body 11 is expanded in the cavity 4 of the mold 1, and the uncured resin 15 a and the reinforcing fibers 15 b are pressurized between the mold 1 and the core material 12. Specifically, when the decompression device 7 is operated with the opening / closing valve 6 of the pipe 5 opened, the air in the cavity 4 is sucked and the inside of the cavity 4 is decompressed. As a result, the hollow body 11 inside the core material 12 expands and presses the core material 12 evenly as indicated by an arrow y from the inside toward the outside. As a result, the prepreg 15 having the uncured resin 15a and the reinforcing fibers 15b is evenly pressed against the inner peripheral surface of the lower mold 3 and the lower end surface of the upper mold 2 by the core material 12, and the prepreg 15 is directed toward the outer periphery. Pressurize. When the hollow body 11 is expanded, the position of the upper mold 2 is fixed, or the upper mold 2 is pressurized toward the lower mold 3.

このあと、第5の工程として、前記の工程で加圧された未硬化の樹脂15aと強化繊維15bとを加熱して硬化させ、コア材12の周囲に繊維強化樹脂層16を成形する。図示していないヒーター等の加熱装置でキャビティ4内を熱硬化温度以上に加熱すると、未硬化の樹脂15aと強化繊維15bはコア材12に密着して一体化されて硬化し、繊維強化樹脂層16が成形される。   Thereafter, as a fifth step, the uncured resin 15a and the reinforcing fibers 15b pressed in the above step are heated and cured to form the fiber reinforced resin layer 16 around the core material 12. When the inside of the cavity 4 is heated to a temperature equal to or higher than the thermosetting temperature by a heating device such as a heater (not shown), the uncured resin 15a and the reinforcing fiber 15b are in close contact with the core material 12 to be cured by being integrated. 16 is molded.

このようにしてコア材12の周囲に、中空体11が膨張した状態で繊維強化樹脂層16が一体化され成形されるため、コア材12と繊維強化樹脂層16との間や、樹脂15aと強化繊維15bとの間にボイドが残留せず、コア材12の最終形状を忠実に再現した繊維強化樹脂構造体10が成形される。また、繊維強化樹脂構造体10にはボイドの残留ほとんどなく、たとえ残留していても、中空体11の膨張による均一加圧によりボイドは分散されるので、繊維強化樹脂層16とコア材12とが均一な強度を確保しつつ一体化されるため、繊維強化樹脂構造体10の強度が向上する。   In this way, the fiber reinforced resin layer 16 is integrated and molded around the core material 12 in a state where the hollow body 11 is expanded, so that the space between the core material 12 and the fiber reinforced resin layer 16 and the resin 15a A void is not left between the reinforcing fibers 15b, and the fiber-reinforced resin structure 10 that faithfully reproduces the final shape of the core material 12 is molded. In addition, there is almost no void remaining in the fiber reinforced resin structure 10, and even if it remains, the voids are dispersed by uniform pressurization due to the expansion of the hollow body 11, so that the fiber reinforced resin layer 16 and the core material 12 Therefore, the strength of the fiber reinforced resin structure 10 is improved.

さらに、繊維強化樹脂構造体10は、中空体11を膨張させることによりコア材12を膨張させてプリプレグ15を加圧して成形されるので、縦壁、横壁に略等しい均一の圧力が樹脂15aと強化繊維15bとに加わり、ボイドの残留を防止でき、内部応力を均一に保つことができる。これにより、長期間に亘って、クラック等の発生しない高品質な繊維強化樹脂構造体10を成形することができる。   Furthermore, since the fiber reinforced resin structure 10 is formed by expanding the hollow body 11 and expanding the core material 12 and pressurizing the prepreg 15, a uniform pressure substantially equal to the vertical wall and the horizontal wall is applied to the resin 15 a. In addition to the reinforcing fibers 15b, voids can be prevented from remaining and internal stress can be kept uniform. Thereby, the high quality fiber reinforced resin structure 10 which does not generate | occur | produce a crack etc. over a long period of time can be shape | molded.

つぎに、本発明の他の実施形態を図3、図4に基づき詳細に説明する。図3は本発明に係る繊維強化樹脂構造体の製造方法の他の実施形態で使用される成形型の断面図を含む製造装置の構成図、図4は図3の製造方法で用いられるコア材を分解した状態の斜視図である。なお、この実施形態は前記した実施形態に対し、成形型は内部のキャビティ内を減圧する真空ポンプ等の減圧装置がなく、コア材の内部に位置する中空体を膨張させる加熱装置を備えており、中空体内の気体や膨張剤が加熱され膨張してコア材を拡張して加圧することを特徴としている。また、プリプレグを加圧するコア材が分割され、複数のコア片から構成されていることを特徴としている。そして、他の実質的に同等の構成については同じ符号を付して詳細な説明は省略する。   Next, another embodiment of the present invention will be described in detail with reference to FIGS. FIG. 3 is a configuration diagram of a manufacturing apparatus including a cross-sectional view of a mold used in another embodiment of the method for manufacturing a fiber-reinforced resin structure according to the present invention, and FIG. 4 is a core material used in the manufacturing method of FIG. It is a perspective view of the state which decomposed | disassembled. This embodiment is different from the above-described embodiment in that the mold does not have a decompression device such as a vacuum pump for decompressing the inside cavity, and has a heating device for expanding the hollow body located inside the core material. The gas or the expanding agent in the hollow body is heated and expanded to expand and pressurize the core material. Moreover, the core material which pressurizes a prepreg is divided | segmented and it is comprised from the several core piece. Other substantially equivalent configurations are denoted by the same reference numerals, and detailed description thereof is omitted.

図3において、本実施形態の成形型1Aは、前記の実施形態の減圧装置の代わりに成形型のキャビティ内を加熱する加熱装置8と、この加熱装置に電力を供給する電源9とを備えている。加熱装置8は、下型3のキャビティ4の下方に水平方向に形成された横穴内に挿入されている。加熱装置8はプリプレグ15を構成する熱硬化性樹脂の樹脂15aの硬化温度以上の加熱ができるように構成されている。加熱装置8が電源9により通電されると、下型3が加熱されて温度が上昇し、キャビティ4内に収容された中空体21が膨張し、コア材22を介してプリプレグ15を加圧するように構成されている。   In FIG. 3, the mold 1A of the present embodiment includes a heating device 8 that heats the inside of the mold cavity, and a power source 9 that supplies power to the heating device, instead of the decompression device of the above-described embodiment. Yes. The heating device 8 is inserted into a horizontal hole formed in the horizontal direction below the cavity 4 of the lower mold 3. The heating device 8 is configured to be able to heat at a temperature equal to or higher than the curing temperature of the thermosetting resin 15a constituting the prepreg 15. When the heating device 8 is energized by the power source 9, the lower mold 3 is heated and the temperature rises so that the hollow body 21 accommodated in the cavity 4 expands and pressurizes the prepreg 15 via the core material 22. It is configured.

図4に示すように、繊維強化樹脂構造体20の芯となるコア材22は、複数個に分割されて構成される。すなわち、中空体21は直方体状をしており、中空体21の周囲に配置されたコア材22は中空多面体として直方体に形成され、直方体の6面に沿って配置される6個のコア片22a〜22fに分割されている。各コア片は直方体の各稜で複数に分割され、直方体の1面に相当する長方形を底面とした四角錐台状に形成されており、四角錐台のそれぞれの傾斜片の先端が対接して、組み合わされたコア材22の直方体の各稜を形成するように構成されている。前記の四角錐台の内側の小さい四角形は中空体21と接触し、小さい四角形と対向する外側の大きい四角形にプリプレグ15が被覆される。   As shown in FIG. 4, the core material 22 which becomes the core of the fiber reinforced resin structure 20 is divided into a plurality of parts. That is, the hollow body 21 has a rectangular parallelepiped shape, and the core material 22 disposed around the hollow body 21 is formed into a rectangular parallelepiped as a hollow polyhedron, and six core pieces 22a disposed along the six surfaces of the rectangular parallelepiped. It is divided into ˜22f. Each core piece is divided into a plurality at each ridge of the rectangular parallelepiped, and is formed in a quadrangular pyramid shape with a rectangle corresponding to one surface of the rectangular parallelepiped as a bottom surface, and the tips of the inclined pieces of the quadrangular pyramid are in contact with each other. , Each of the edges of the rectangular parallelepiped of the combined core material 22 is formed. The small square inside the quadrangular pyramid contacts the hollow body 21, and the prepreg 15 is coated on the large square outside facing the small square.

この実施形態において、成形型1Aを用いて繊維強化樹脂構造体20を成形するときは、膨張性を有した中空体21の周囲に、分割されたコア片22a〜22fを配置する。そして、分割されたコア片を中空体21の周囲に配置した後、前記の実施形態と同様に、コア材22の周囲に未硬化の樹脂15aと強化繊維15bとを有するプリプレグ15を積層して被覆し、プリプレグ15が積層、被覆されたコア材22を成形型1Aのキャビティ4内に配置し、その後に、成形型1Aのキャビティ4内を加熱装置8で加熱し中空体21を膨張させる。中空体21を膨張させる工程の加熱温度は、プリプレグ15の樹脂15aを構成する熱硬化性樹脂の硬化温度より低く設定され、膨張後は前記硬化温度以上に設定し、プリプレグ15を硬化させて繊維強化樹脂層16を成形する。   In this embodiment, when the fiber reinforced resin structure 20 is molded using the mold 1A, the divided core pieces 22a to 22f are disposed around the hollow body 21 having expandability. And after arrange | positioning the divided | segmented core piece to the circumference | surroundings of the hollow body 21, the prepreg 15 which has the uncured resin 15a and the reinforced fiber 15b around the core material 22 is laminated | stacked like the said embodiment. The core material 22 that has been coated and laminated and coated with the prepreg 15 is placed in the cavity 4 of the mold 1A, and then the cavity 4 of the mold 1A is heated by the heating device 8 to expand the hollow body 21. The heating temperature in the step of expanding the hollow body 21 is set to be lower than the curing temperature of the thermosetting resin constituting the resin 15a of the prepreg 15, and after the expansion, the heating temperature is set to be equal to or higher than the curing temperature, and the prepreg 15 is cured. The reinforced resin layer 16 is formed.

この実施形態では、コア材22は複数のコア片から構成され、コア材22を用いて繊維強化樹脂構造体20を成形すると、内部の中空体21の膨張に伴ってコア材22を構成する複数のコア片22a〜22fは、それぞれの面方向と直角の方向に自由に移動することができる。また、複数のコア片は、中空多面体の各稜に沿って分割され、すべてのコア片の外周面は中空多面体の各稜まで延在しており、中空多面体の外周面でプリプレグのすべての領域を均一に加圧することができる。この結果、コア材の最終形状が複雑な場合でも、より忠実に形状を再現することができると共に、ボイドの残留をより少なくすることができ、繊維強化樹脂構造体20の強度をより向上させることができる。   In this embodiment, the core material 22 is composed of a plurality of core pieces, and when the fiber reinforced resin structure 20 is molded using the core material 22, a plurality of core materials 22 are configured as the hollow body 21 in the interior expands. The core pieces 22a to 22f can freely move in a direction perpendicular to the respective surface directions. Further, the plurality of core pieces are divided along each ridge of the hollow polyhedron, and the outer peripheral surfaces of all the core pieces extend to the respective ridges of the hollow polyhedron, and all the regions of the prepreg on the outer peripheral surface of the hollow polyhedron Can be uniformly pressurized. As a result, even when the final shape of the core material is complicated, it is possible to reproduce the shape more faithfully, to reduce the residual voids, and to further improve the strength of the fiber reinforced resin structure 20. Can do.

さらに、本発明に係る繊維強化樹脂構造体の製造方法で使用される中空体、コア材、及びプリプレグの他の実施形態を図5に基づいて説明する。この実施形態は、繊維強化樹脂構造体の芯となる中空体、コア材、及びプリプレグが2個に分割されて構成されることを特徴としている。なお、2個に限られるものでなく、3個以上の複数個から構成されるものでもよいことは勿論である。   Furthermore, other embodiments of the hollow body, the core material, and the prepreg used in the method for producing a fiber-reinforced resin structure according to the present invention will be described with reference to FIG. This embodiment is characterized in that the hollow body, the core material, and the prepreg that are the core of the fiber-reinforced resin structure are divided into two parts. Of course, it is not limited to two, but may be composed of three or more.

図5において、本発明の製造方法で成形される繊維強化樹脂構造体30は、2つの中空体31,31のそれぞれの周囲に、コア材32,32が配置され、中空体を内蔵するコア材を芯として構成される。中空体31はナイロン等のバルーンで構成される。コア材32は発泡樹脂等で構成される。そして、中空体31を内部に備えるコア材32の周囲に、樹脂36と強化繊維37とから構成されるプリプレグ35を積層し、それぞれのコア材32,32の表面をプリプレグ35,35で被覆する。   In FIG. 5, a fiber reinforced resin structure 30 molded by the manufacturing method of the present invention has a core material 32, 32 disposed around each of two hollow bodies 31, 31, and a core material incorporating the hollow body. Is configured with a core. The hollow body 31 is made of a balloon such as nylon. The core material 32 is made of foamed resin or the like. And the prepreg 35 comprised from the resin 36 and the reinforced fiber 37 is laminated | stacked around the core material 32 which has the hollow body 31 inside, and the surface of each core material 32 and 32 is coat | covered with the prepreg 35 and 35. .

ついで、プリプレグで被覆したコア材32,32を2つ並べて、図示していない成形型のキャビティ内に配置する。この後の工程は、前記の実施形態と同様であり、成形型のキャビティ内を減圧装置を用いて減圧する、あるいは加熱装置を用いて加熱することで中空体31,31内の気体を膨張させ、未硬化の樹脂36と強化繊維37を有するプリプレグ35を加圧し、プリプレグ35を硬化させて2つのコア材32,32の周囲に繊維強化樹脂層38を成形し、繊維強化樹脂構造体30を成形する。なお、減圧装置と加熱装置を併用して中空体の内部の気体を膨張させてもよい。   Next, two core materials 32, 32 covered with the prepreg are arranged side by side and placed in a cavity of a mold (not shown). The subsequent steps are the same as in the above embodiment, and the gas in the hollow bodies 31 and 31 is expanded by depressurizing the inside of the mold cavity using a depressurization apparatus or heating using a heating apparatus. Then, the prepreg 35 having the uncured resin 36 and the reinforcing fiber 37 is pressurized, the prepreg 35 is cured, and the fiber reinforced resin layer 38 is formed around the two core members 32 and 32, and the fiber reinforced resin structure 30 is formed. Mold. Note that the gas inside the hollow body may be expanded by using a decompression device and a heating device in combination.

このように成形された繊維強化樹脂構造体30では、芯となるコア材32,32は2つ並んでいるため繊維強化樹脂層38の縦壁部38a,38b,38cが3面に形成され、中央に位置する縦壁部38bが補強となって強度が向上する効果を有する。特に、曲げやねじれに強い高剛性の繊維強化樹脂構造体30を成形することができる。   In the fiber reinforced resin structure 30 molded in this way, since the core materials 32 and 32 serving as the core are arranged side by side, the vertical wall portions 38a, 38b, and 38c of the fiber reinforced resin layer 38 are formed on three surfaces. The vertical wall portion 38b located at the center is reinforced and has an effect of improving the strength. In particular, a highly rigid fiber reinforced resin structure 30 that is resistant to bending and twisting can be formed.

本発明のさらに他の実施形態として、コア材の内部に位置する中空体の密閉空間に予め膨張剤を封入してもよい。この膨張剤は、少なくとも加熱により膨張するものであり、一例として重曹が好適である。膨張剤は中空体の内部に気体と共に封入するようにしてもよい。さらに、膨張剤として、中空体の密閉空間に、加熱すると昇華する充填剤等を封入し、中空体を膨張させるように構成してもよい。   As still another embodiment of the present invention, an expansion agent may be sealed in advance in a sealed space of a hollow body located inside the core material. This expansion agent expands at least by heating, and sodium bicarbonate is preferable as an example. The inflating agent may be enclosed with gas inside the hollow body. Furthermore, as a swelling agent, a filler or the like that sublimes when heated may be enclosed in a sealed space of the hollow body so as to expand the hollow body.

この実施形態では、前記の膨張剤が封入された中空体を用い、中空体を膨張させて未硬化の樹脂と強化繊維の加圧を行う加圧工程において、キャビティ内を加熱して膨張剤を膨張させて行うものである。中空体の密閉空間に予め膨張剤を封入し、加熱装置を作動させて中空体を加熱すると、中空体内部で膨張剤が膨張し、キャビティ内で中空体が膨張する。これにより、成形型とコア材との間において、プリプレグの未硬化の樹脂と強化繊維をコア材が加圧する。そして、加圧された未硬化の樹脂と強化繊維とを加熱してコア材の周囲に繊維強化樹脂層を成形することができる。この実施形態では、気体で中空体を膨張させず、固体あるいは粉体の膨張剤を使用できるため保守管理が容易となり、例えば気体と膨張剤を併用することで膨張圧力を高めて複雑な最終形状でも、より正確に成形することができる。   In this embodiment, the inside of the cavity is heated in the pressurizing step in which the hollow body is encapsulated and the hollow body is expanded to pressurize the uncured resin and the reinforcing fibers. It is performed by inflating. When the expansion agent is sealed in the sealed space of the hollow body in advance and the hollow body is heated by operating the heating device, the expansion agent expands inside the hollow body, and the hollow body expands in the cavity. Accordingly, the core material pressurizes the uncured resin and the reinforcing fiber of the prepreg between the mold and the core material. The pressurized uncured resin and the reinforcing fibers can be heated to form a fiber reinforced resin layer around the core material. In this embodiment, the solid body or powder expansion agent can be used without expanding the hollow body with gas, so that maintenance management becomes easy. For example, by using a combination of gas and expansion agent, the expansion pressure is increased and the complex final shape is increased. But it can be molded more accurately.

以上、本発明の実施形態について詳述したが、本発明は、前記の実施形態に限定されるものではなく、特許請求の範囲に記載された本発明の精神を逸脱しない範囲で、種々の設計変更を行うことができるものである。例えば、プリプレグを構成する強化繊維としてカーボンファイバの例を示したが、これに限られるものでなく、グラスファイバやセラミックファイバ等の他の強化繊維を用いることもできる。   Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and various designs can be made without departing from the spirit of the present invention described in the claims. It can be changed. For example, although the example of carbon fiber was shown as a reinforced fiber which comprises a prepreg, it is not restricted to this, Other reinforcing fibers, such as glass fiber and a ceramic fiber, can also be used.

また、プリプレグを構成する強化繊維は、織布、不織布や、繊維がランダムに配列されたもの等、適宜のものを用いることができる。中空体として直方体状の形状のものを示したが、球状等、適宜の形状のものを用いることができ、コア材を加圧できれば、その形状は問われない。   In addition, as the reinforcing fibers constituting the prepreg, appropriate ones such as a woven fabric, a non-woven fabric, and fibers in which fibers are randomly arranged can be used. A rectangular parallelepiped shape is shown as the hollow body, but any shape such as a spherical shape can be used as long as the core material can be pressurized.

前記した第1の実施形態では、成形型はキャビティ内を減圧する真空ポンプ等の減圧装置を備えているが、前記した第2の実施形態で示される加熱装置を併用し、キャビティ内を減圧すると共に、加熱装置で中空体を加熱して中空体を膨張させるように構成してもよい。このように、減圧装置と加熱装置の両方を備えるように構成することで、中空体の膨張圧力を高めることができ、直角のコーナー部や複雑な最終形状でも正確に成形することができる。   In the first embodiment described above, the mold is provided with a decompression device such as a vacuum pump that decompresses the inside of the cavity. However, the inside of the cavity is decompressed together with the heating device shown in the second embodiment. At the same time, the hollow body may be expanded by heating the hollow body with a heating device. Thus, by comprising both a decompression device and a heating device, the expansion pressure of the hollow body can be increased, and even a right-angled corner portion or a complicated final shape can be accurately formed.

本発明の繊維強化樹脂構造体は最終形状が複雑な場合でも精度良く成形することができ、ボイドの少ない品質の高い成形品とすることができ、本発明の活用例として、自動車や二輪車等の各種の精密成形品の用途のほか、電気部品や玩具等の各種の成形品にも適用できる。   The fiber reinforced resin structure of the present invention can be accurately molded even when the final shape is complicated, and can be a high-quality molded product with few voids. Examples of utilization of the present invention include automobiles and motorcycles. In addition to the use of various precision molded products, it can also be applied to various molded products such as electrical parts and toys.

本発明に係る繊維強化樹脂構造体の製造方法の一実施形態で使用される成形型の断面図を含む製造装置の構成図。The block diagram of the manufacturing apparatus containing sectional drawing of the shaping | molding die used by one Embodiment of the manufacturing method of the fiber reinforced resin structure which concerns on this invention. 図1の成形型を用いて成形された繊維強化樹脂構造体の断面図。Sectional drawing of the fiber reinforced resin structure shape | molded using the shaping | molding die of FIG. 本発明に係る繊維強化樹脂構造体の製造方法の他の実施形態で使用される成形型の断面図を含む製造装置の構成図。The block diagram of the manufacturing apparatus containing sectional drawing of the shaping | molding die used with other embodiment of the manufacturing method of the fiber reinforced resin structure which concerns on this invention. 図3の繊維強化樹脂構造体の製造方法で用いられるコア材を分解した状態の斜視図。The perspective view of the state which decomposed | disassembled the core material used with the manufacturing method of the fiber reinforced resin structure of FIG. 本発明に係る繊維強化樹脂構造体の製造方法で使用される中空体、コア材、及びプリプレグの他の実施形態の断面図。Sectional drawing of other embodiment of the hollow body used in the manufacturing method of the fiber reinforced resin structure which concerns on this invention, a core material, and a prepreg.

符号の説明Explanation of symbols

1,1A:成形型、2:上型、3:下型、4:キャビティ、7:減圧装置、8:加熱装置、10,20,30:繊維強化樹脂構造体(FRP構造体)、11,21,31:中空体、12,22,32:コア材、15,35:プリプレグ、15a,36:樹脂、15b,37:強化繊維、16,38:繊維強化樹脂層、22a〜22f:コア材の複数のコア片   1, 1A: Mold, 2: Upper mold, 3: Lower mold, 4: Cavity, 7: Depressurization device, 8: Heating device, 10, 20, 30: Fiber reinforced resin structure (FRP structure), 11, 21, 31: hollow body, 12, 22, 32: core material, 15, 35: prepreg, 15a, 36: resin, 15b, 37: reinforced fiber, 16, 38: fiber reinforced resin layer, 22a-22f: core material Multiple core pieces of

Claims (7)

膨張性を有した中空体の周囲にコア材を配置する工程と、
前記配置されたコア材の周囲に未硬化の樹脂と強化繊維とを有するプリプレグを積層して被覆する工程と、
前記プリプレグが積層、被覆されたコア材を成形型のキャビティ内に配置する工程と、
前記成形型のキャビティ内において前記中空体を膨張させて、成形型と前記コア材の間において前記未硬化の樹脂及び前記強化繊維を加圧する工程と、
前記加圧された前記未硬化の樹脂及び前記強化繊維を加熱して硬化させ前記コア材の周囲に繊維強化樹脂を成形する工程と、
を少なくとも含むことを特徴とする繊維強化樹脂構造体の製造方法。
Arranging a core material around a hollow body having expandability;
Laminating and covering a prepreg having uncured resin and reinforcing fibers around the arranged core material;
Placing the core material laminated and coated with the prepreg in the cavity of the mold; and
Expanding the hollow body in the cavity of the mold and pressurizing the uncured resin and the reinforcing fibers between the mold and the core material;
Heating and curing the pressurized uncured resin and the reinforcing fiber to form a fiber reinforced resin around the core material;
A method for producing a fiber-reinforced resin structure, comprising:
前記コア材を配置する工程において、前記コア材として、複数のコア片から構成されたコア材を用いることを特徴とする請求項1に記載の繊維強化樹脂構造体の製造方法。   The method for producing a fiber reinforced resin structure according to claim 1, wherein in the step of arranging the core material, a core material composed of a plurality of core pieces is used as the core material. 前記コア材として、前記中空体の周囲に前記コア材を配置したときに中空多面体が形成されるコア材を用い、該コア材を構成する前記複数のコア片の各コア片として、前記中空多面体の各稜に沿って複数に分割されるコア片を用いることを特徴とする請求項2に記載の繊維強化樹脂構造体の製造方法。   As the core material, a core material in which a hollow polyhedron is formed when the core material is arranged around the hollow body, and the hollow polyhedron is used as each core piece of the plurality of core pieces constituting the core material. The method of manufacturing a fiber-reinforced resin structure according to claim 2, wherein a core piece divided into a plurality of pieces along each ridge is used. 前記膨張性を有した中空体として、内部に気体が密封された中空体を用い、前記加圧工程において、前記未硬化の樹脂及び前記強化繊維の加圧を、前記キャビティ内を減圧及び/又は加熱することにより行うことを特徴とする請求項1〜3のいずれかに記載の繊維強化樹脂構造体の製造方法。   As the hollow body having the expandability, a hollow body in which a gas is sealed is used. In the pressurizing step, the uncured resin and the reinforcing fiber are pressurized, the inside of the cavity is decompressed and / or It performs by heating, The manufacturing method of the fiber reinforced resin structure in any one of Claims 1-3 characterized by the above-mentioned. 前記膨張性を有した中空体として、内部に、少なくとも加熱により膨張する膨張剤が封入された中空体を用い、前記加圧工程において、前記未硬化の樹脂及び前記強化繊維の加圧を、前記キャビティ内を前記膨張剤が膨張可能な温度領域まで加熱することにより行うことを特徴とする請求項1〜3のいずれかに記載の繊維強化樹脂構造体の製造方法。   As the hollow body having the expandability, a hollow body in which an expansion agent that expands at least by heating is enclosed, and in the pressurizing step, the uncured resin and the reinforcing fibers are pressurized, The method for producing a fiber-reinforced resin structure according to any one of claims 1 to 3, wherein the method is performed by heating the inside of the cavity to a temperature region where the expansion agent can expand. 前記未硬化の樹脂は、熱硬化性樹脂からなり、前記中空体の前記膨張を前記熱硬化性樹脂の硬化温度より低い加熱温度条件で行うことを特徴とする請求項1〜5のいずれかに記載の繊維強化樹脂構造体の製造方法。   The uncured resin is made of a thermosetting resin, and the expansion of the hollow body is performed under a heating temperature condition lower than a curing temperature of the thermosetting resin. The manufacturing method of the fiber reinforced resin structure of description. 膨張性を有した中空体と、該中空体の周囲に、成形された繊維強化樹脂層とを備える繊維強化樹脂構造体であって、
前記繊維強化樹脂構造体の前記中空体と前記繊維強化樹脂層との間には、さらに膨張性を有したコア材が形成されており、
前記繊維強化樹脂層は、前記中空体及び前記コア材が膨張した状態で、加熱により硬化した樹脂と強化繊維とを有することを特徴とする繊維強化樹脂構造体。
A fiber reinforced resin structure comprising a hollow body having expandability and a molded fiber reinforced resin layer around the hollow body,
Between the hollow body of the fiber reinforced resin structure and the fiber reinforced resin layer, a core material having further expandability is formed,
The fiber reinforced resin layer is characterized by having a resin cured by heating and reinforcing fibers in a state where the hollow body and the core material are expanded.
JP2007082018A 2007-03-27 2007-03-27 Method of manufacturing fiber-reinforced resin structure and fiber-reinforced resin structure Pending JP2008238566A (en)

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