JP2008307726A - Method for molding fiber-reinforced composite material and fiber-reinforced composite material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress the decline of a volume resin content in the inner layer of a fiber-reinforced composite material in a method for molding fiber-reinforced composite material. <P>SOLUTION: The method for molding the fiber-reinforced composite material by winding a prepreg formed by impregnating a fiber bundle with a resin onto a mandrel 22 comprises the first winding process (S10) of winding the first prepreg onto the mandrel 22, the second winding process (S12) of winding the second prepreg onto the mandrel 22 with the first prepreg wound, and the third winding process (S14) of winding the third prepreg onto the mandrel 22 with the second prepreg wound. The first prepreg is formed by impregnating the fiber bundle with the first resin, the second prepreg is formed by impregnating the fiber bundle with the second resin, and the third prepreg is formed by impregnating the fiber bundle with the third resin. The thermal expansion coefficient of the second resin is larger than that of the first resin, and the thermal expansion coefficient of the third resin is larger than that of the second resin. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a fiber reinforced composite material molding method and a fiber reinforced composite material, and in particular, forms a fiber reinforced composite material by winding a prepreg formed by impregnating a fiber bundle with a resin around a winding member. The present invention relates to a fiber reinforced composite material molding method and a fiber reinforced composite material.

  For example, a high-pressure tank for a vehicle that stores compressed hydrogen gas, compressed natural gas (CNG), or the like uses a fiber-reinforced composite material for weight reduction. As such a fiber-reinforced composite material, for example, a fiber-reinforced composite material formed by impregnating a carbon fiber or the like as a reinforcing fiber with an epoxy resin or the like that is a thermosetting resin is used. As a fiber-reinforced composite material forming method for forming a fiber-reinforced composite material, for example, a filament winding (FW) method or the like is used. The filament winding method is a method in which a fiber-reinforced composite material is formed by continuously winding and laminating resin-impregnated fibers around a mandrel or the like.

  Patent Document 1 is a wound laminate of resin-impregnated continuous fibers, which has an inner layer and an outer layer, and the fiber content of the fiber reinforced resin in the inner layer is lower than the fiber content of the fiber reinforced resin in the outer layer. A resin tubular body is shown, and a method of manufacturing a fiber reinforced resin tubular body is formed by winding a resin-impregnated continuous fiber around a rotating mandrel in a direction of 90 degrees with respect to a mandrel axis to form an inner layer. The outer layer is formed by winding and laminating resin-impregnated continuous fibers in a predetermined angle direction, and the tension of the resin-impregnated continuous fibers when forming the inner layer is lower than the tension of the resin-impregnated continuous fibers when forming the outer layer It is shown.

  In Patent Document 2, a reinforcing fiber impregnated with a resin is wound around a mandrel several times by a filament winding method or the like and stacked in the thickness direction, and the supply condition of the reinforcing fiber or fiber is changed during the winding. It is shown to be molded in a single piece.

  In Patent Document 3, the first prepreg is sequentially wound around a mandrel, and the first prepreg sheet wound around the innermost layer on the mandrel side is obtained by aligning reinforcing fibers in the circumferential direction of the mandrel. The 1 prepreg sheet is one in which reinforcing fibers are aligned in the longitudinal direction of the mandrel, and it is shown that the second prepreg sheet is wound around the outside of the first prepreg sheet. It is indicated that the prepreg sheet is a sheet formed by impregnating a reinforcing fiber such as glass fiber or carbon fiber with a synthetic resin.

JP-A-6-328577 JP 58-138618 A JP 2001-231409 A

  By the way, when a prepreg is wound around a mandrel or the like to form a laminated body, the prepreg is generally wound around a mandrel or the like under a predetermined tension. The resin contained in the prepreg is semi-cured and has low resin viscosity and fluidity. Therefore, the resin contained in the prepreg wound inside on the mandrel side may flow out toward the outside on the surface layer side. And in the fiber reinforced composite material which hardened | cured and shape | molded the laminated body which laminated | stacked the prepreg, resin volume content rate may fall by resin flowing out in the inner layer which is a mandrel side.

  Then, the objective of this invention is providing the fiber reinforced composite material shaping | molding method and fiber reinforced composite material which can suppress the fall of the resin volume content rate in the inner layer of a fiber reinforced composite material.

  The fiber-reinforced composite material molding method according to the present invention is a fiber-reinforced composite material molding method for molding a fiber-reinforced composite material by winding a prepreg formed by impregnating a fiber bundle with a resin around a winding member. A first winding step of winding the first prepreg around the winding member, and a second winding step of winding the second prepreg around the winding member around which the first prepreg is wound, The first prepreg is formed by impregnating the fiber bundle with the first resin, the second prepreg is formed by impregnating the fiber bundle with the second resin, and the thermal expansion coefficient of the second resin is the heat of the first resin. It is characterized by a larger expansion coefficient.

  The fiber-reinforced composite material molding method according to the present invention includes a third winding step of winding the third prepreg on a winding member around which the second prepreg is wound, and the third prepreg is a third bundle of fiber bundles. It is formed by impregnating a resin, and the thermal expansion coefficient of the third resin is larger than that of the second resin.

  A fiber-reinforced composite material according to the present invention is a fiber-reinforced composite material formed by winding a prepreg formed by impregnating a fiber bundle with a resin around a winding member, and the fiber is applied to the winding member. The first prepreg formed by impregnating the first resin into the bundle is wound, and the wound member around which the first prepreg is wound is impregnated with the second resin having a thermal expansion coefficient larger than that of the first resin. The second prepreg formed in this manner is wound and molded.

  The fiber reinforced composite material according to the present invention includes a third prepreg formed by impregnating a wound member around which a second prepreg is wound with a third resin having a thermal expansion coefficient larger than that of the second resin in a fiber bundle. It is formed by winding.

  The fiber-reinforced composite material molding method according to the present invention is a fiber-reinforced composite material molding method for molding a fiber-reinforced composite material by winding a prepreg formed by impregnating a fiber bundle with a resin around a winding member. A first winding step of winding the first prepreg around the winding member, and a second winding step of winding the second prepreg around the winding member around which the first prepreg is wound, The first prepreg is formed by impregnating the fiber bundle with the first resin, the second prepreg is formed by impregnating the fiber bundle with the second resin, and the resin content of the second prepreg is the resin of the first prepreg. It is characterized by being smaller than the content rate.

  The fiber-reinforced composite material molding method according to the present invention includes a third winding step of winding the third prepreg on a winding member around which the second prepreg is wound, and the third prepreg is a third bundle of fiber bundles. It is formed by impregnating a resin, and the resin content of the third prepreg is smaller than the resin content of the second prepreg.

  A fiber-reinforced composite material according to the present invention is a fiber-reinforced composite material formed by winding a prepreg formed by impregnating a fiber bundle with a resin around a winding member. A first prepreg formed by impregnating a fiber bundle with one resin is wound, the wound member around which the first prepreg is wound has a resin content smaller than that of the first prepreg, and the fiber bundle has a second resin. It is characterized by being formed by winding a second prepreg formed by impregnating selenium.

  The fiber reinforced composite material according to the present invention is a third member formed by impregnating a third bundle with a fiber bundle having a resin content smaller than that of the second prepreg on the wound member around which the second prepreg is wound. It is formed by winding a prepreg.

  According to the fiber-reinforced composite material molding method and the fiber-reinforced composite material in the above configuration, it is possible to suppress a decrease in the resin volume content in the inner layer of the fiber-reinforced composite material.

  Embodiments according to the present invention will be described below in detail with reference to the drawings. First, a fiber reinforced composite material forming system for forming a fiber reinforced composite material will be described. FIG. 1 is a diagram showing a configuration of a fiber-reinforced composite material molding system 10.

  The fiber supply device 12 has a function of feeding a prepreg 14 formed by impregnating a fiber bundle with resin. As the fiber supply device 12, for example, a creel stand or the like can be used. The fiber supply device 12 includes a plurality of bobbins 16 around which the prepreg 14 is wound, and a plurality of fiber tension adjusting devices 18 for adjusting the tension applied to the prepreg 14. Thereby, the prepreg 14 delivered from the bobbin 16 can be adjusted to a predetermined tension by the fiber tension adjusting device 18 and supplied. Of course, depending on other conditions, the number of prepregs 14 is not limited to a plurality, and may be one.

  The fiber tension measuring device (not shown) has a function of measuring the tension applied to the plurality of prepregs 14 sent out from the fiber supply device 12. As the fiber tension measuring device (not shown), a tension measuring device generally used for measuring the tension of carbon fiber or the like can be used.

  The filament winding device 20 has a function of winding the prepreg 14 fed from a fiber tension measuring device (not shown) around a winding member such as a mandrel 22 (Mandrel) that is a mold or a mandrel. The filament winding apparatus 20 can wind the prepreg 14 in the circumferential direction or the axial direction of the mandrel 22 or the like. The filament winding apparatus 20 includes, for example, a hoop winding that is wound substantially perpendicular to the rotation axis direction of the mandrel 22 or the like, or a helical winding that is wound at a predetermined angle with respect to the rotation axis direction of the mandrel 22 or the like. The prepreg 14 can be wound around the mandrel 22 or the like for lamination.

  When manufacturing a pressure vessel, for example, a high-pressure tank, a resin liner formed of a polyamide resin or the like on a winding member or a metal liner formed of aluminum or the like can be used. The prepreg 14 is wound and laminated by a filament winding device 20 around a resin liner or a metal liner while applying tension. Further, according to the filament winding apparatus 20, the prepreg 14 can be wound and laminated not only on the body portion of the high-pressure tank but also on the dome portion or the like. And the laminated body formed by laminating | stacking the prepreg 14 is heat-hardened with a resin curing furnace etc., and a fiber reinforced composite material is shape | molded.

  The control device 24 is connected to the fiber supply device 12, a fiber tension measuring device (not shown), and the filament winding device 20 using a lead wire, a connector, and the like. The control device 24 has a function capable of controlling the fiber supply device 12, a fiber tension measuring device (not shown), and the filament winding device 20. For example, the filament winding device 20 and the like can be started and stopped under the control of the control device 24. The control device 24 has a function of controlling the tension of the prepreg 14 by inputting an electrical signal of tension data of the prepreg 14 output from a fiber tension measuring device (not shown). The control device 24 can be configured by, for example, a personal computer (PC). The data logger 26 connected to the control device 24 stores and stores tension data of the prepreg 14 and the like.

  Next, a method for forming a fiber reinforced composite material will be described. FIG. 2 is a flowchart showing a fiber-reinforced composite material molding method. The forming method of the fiber reinforced composite material includes a first winding step (S10), a second winding step (S12), and a third winding step (S14).

  The first winding step (S10) is a step of winding the first prepreg around the mandrel 22. The first prepreg is formed by impregnating a fiber bundle with a first resin.

  For the fibers of the fiber bundle, carbon fibers that are high-strength fibers or high-elasticity fibers can be used. As the carbon fiber, rayon-based carbon fiber, polyacrylonitrile (PAN) -based carbon fiber, pitch-based carbon fiber, or the like is used. Of course, the fiber of the fiber bundle used for the first prepreg is not limited to carbon fiber, and glass fiber or aramid fiber can be used.

  For the fiber bundle, for example, yarns, strands, rovings or the like in which filaments that are single fibers having a fiber diameter of 1 μm to 5 μm are bundled can be used. For example, a carbon fiber strand in which 10,000 to 50,000 carbon fiber filaments are bundled can be used for a fiber bundle using carbon fibers. In addition, the fiber bundle may be made of not only a unidirectional material but also a fiber sheet of a woven material woven with a plain weave or satin weave. Of course, depending on other conditions, the fiber bundle is not limited to these forms.

  As the first resin, for example, a thermosetting resin such as an epoxy resin, a phenol resin, or an unsaturated polyester resin can be used. Of course, the first resin is not limited to the synthetic resin. The first resin is preferably a synthetic resin having a resin viscosity of 100 mPas or less at room temperature.

  First, the bobbin 16 around which the first prepreg is wound is set in the fiber supply device 12. The first prepreg fed with a predetermined tension from the fiber supply device 12 is wound around the mandrel 22 by the filament winding device 20 and laminated.

  The second winding step (S12) is a step of winding the second prepreg around the mandrel 22 around which the first prepreg is wound. The second prepreg is formed by impregnating the fiber bundle with the second resin.

  As the fiber bundle included in the second prepreg, it is preferable to use the same fiber bundle as the fiber bundle included in the first prepreg. For example, when carbon fiber is used for the fiber bundle included in the first prepreg, it is preferable to use the carbon fiber for the fiber bundle included in the second prepreg. Of course, depending on other conditions, a fiber bundle different from the fiber bundle included in the first prepreg may be used as the fiber bundle included in the second prepreg.

  As the second resin, a synthetic resin having a higher coefficient of thermal expansion than the first resin is used. Thereby, the volumetric shrinkage after molding by curing the second resin can be made larger than the volumetric shrinkage after molding by curing the first resin. A material different from the main agent, curing agent, and additive contained in the first resin can be used for the second resin, so that the thermal expansion coefficient of the second resin can be made larger than that of the first resin. Further, even when the same material as the main agent, curing agent, and additive contained in the first resin is used, the coefficient of thermal expansion of the second resin is made larger than the coefficient of thermal expansion of the first resin by changing the content of each material. can do. As the second resin, it is preferable to use a synthetic resin having a resin viscosity of 100 mPas or less at room temperature. It is preferable to use the same kind of synthetic resin as the first resin for the second resin. For example, when an epoxy resin is used for the first resin, it is preferable to use an epoxy resin for the second resin. Of course, depending on other conditions, a synthetic resin different from the first resin may be used as the second resin.

  After the bobbin 16 around which the second prepreg is wound is set in the fiber supply device 12, the second prepreg sent from the fiber supply device 12 under a predetermined tension is wound by the filament winding device 20. The mandrel 22 is wound and laminated.

  The third winding step (S14) is a step of winding the third prepreg around the mandrel 22 around which the second prepreg is wound. The third prepreg is formed by impregnating the fiber bundle with a third resin.

  As the fiber bundle included in the third prepreg, it is preferable to use a fiber bundle of the same type as the fiber bundle included in the first prepreg or the second prepreg. For example, when carbon fibers are used for the fiber bundles included in the first prepreg and the second prepreg, it is preferable to use carbon fibers for the fiber bundles included in the third prepreg. Of course, as the fiber bundle included in the third prepreg, a fiber bundle different from the fiber bundle included in the first prepreg or the second prepreg may be used.

  As the third resin, a synthetic resin having a larger coefficient of thermal expansion than the second resin is used. Thereby, the volumetric shrinkage after molding by curing of the third resin can be made larger than the volumetric shrinkage after molding by curing of the second resin. By using a material different from the main agent, curing agent, and additive contained in the second resin for the third resin, the thermal expansion coefficient of the third resin can be made larger than that of the second resin. Even when the same material as the main agent, curing agent, and additive contained in the second resin is used, the coefficient of thermal expansion of the third resin is made larger than the coefficient of thermal expansion of the second resin by changing the content of each material. can do. As the third resin, it is preferable to use a synthetic resin having a resin viscosity of 100 mPas or less at room temperature. It is preferable to use the same type of synthetic resin as the first resin or the second resin for the third resin. For example, when an epoxy resin is used for the first resin and the second resin, it is preferable to use an epoxy resin for the third resin. Of course, depending on other conditions, a synthetic resin different from the first resin or the second resin may be used as the third resin.

  After the bobbin 16 around which the third prepreg is wound is set in the fiber supply device 12, the third prepreg fed from the fiber supply device 12 under a predetermined tension is wound by the filament winding device 20. The mandrel 22 is wound and laminated.

  FIG. 3 is a cross-sectional view showing a laminate 30 in which the first prepreg, the second prepreg, and the third prepreg are wound around the mandrel 22 and laminated. The stacked body 30 includes a first layer 32, a second layer 34, and a third layer 36. The first layer 32 is a layer formed by winding the first prepreg around the mandrel 22, the second layer 34 is a layer formed by winding the second prepreg, and the third layer 36 is the first layer 36. It is a layer formed by winding 3 prepregs. Each of the first to third prepregs is wound around the mandrel 22 with a predetermined tension applied. Therefore, a part of the first resin contained in the first prepreg flows out from the first layer 32 to the second layer 34 or the third layer 36, and the second resin contained in the second prepreg becomes the second It flows from the layer 34 to the third layer 36 and flows out.

  And the laminated body 30 is heat-hardened with a resin curing furnace etc., and a fiber reinforced composite material is shape | molded. Here, the thermal expansion coefficient of the second resin is larger than the thermal expansion coefficient of the first resin, and the thermal expansion coefficient of the third resin is larger than the thermal expansion coefficient of the second resin. As described above, the larger the thermal expansion coefficient of the synthetic resin, the larger the volume shrinkage ratio after molding due to the curing of the synthetic resin. Therefore, among the first resin to the third resin, the first resin has the smallest coefficient of thermal expansion, so that the volume shrinkage after molding due to the hardening of the first resin is the smallest. Moreover, since the third resin has the largest coefficient of thermal expansion, the volumetric shrinkage after molding due to the curing of the third resin is the largest.

  Since the volume shrinkage after molding by the curing of the first resin is the smallest, the first layer 32 after curing has the largest resin volume content when there is no outflow of the first resin. On the contrary, since the volume shrinkage ratio after molding due to the curing of the third resin is the largest, when there is no inflow of the first resin or the second resin, the cured third layer 36 has the highest resin volume content. Get smaller. However, as described above, a part of the first resin contained in the first prepreg flows out from the first layer 32 to the second layer 34 or the third layer 36, and one part of the second resin contained in the second prepreg. Part flows out from the second layer 34 to the third layer 36. Therefore, the first layer 32 has the largest resin volume content and the third layer 36 has the smallest resin volume content of the fiber reinforced composite material formed by curing the laminate 30 in which the first prepreg to the third prepreg are laminated.

  According to the above configuration, the mandrel 22 is wound with the first prepreg formed by impregnating the fiber bundle with the first resin, and the mandrel 22 around which the first prepreg is wound is larger than the first resin in the fiber bundle. A second prepreg formed by impregnating a second resin having a thermal expansion coefficient is wound, and a third resin having a thermal expansion coefficient larger than that of the second resin on the fiber bundle is wound around the mandrel 22 on which the second prepreg is wound. By winding the third prepreg formed by impregnating and molding the fiber reinforced composite material, it is possible to suppress a decrease in the resin volume content in the inner layer of the fiber reinforced composite material.

  Next, another fiber reinforced composite material molding method will be described. In other fiber-reinforced composite material molding methods, the first to third prepregs used are different from the above-described fiber-reinforced composite material molding method. Detailed description of similar elements is omitted.

  The fiber-reinforced composite material molding method includes a first winding process, a second winding process, and a third winding process.

  The first winding step is a step of winding the first prepreg around the mandrel 22. The first prepreg is formed by impregnating a fiber bundle with a first resin. The above-described carbon fiber or the like is used for the fiber bundle, and the above-described epoxy resin or the like is used for the first resin. The first resin is preferably a synthetic resin having a resin viscosity of 100 mPas or less at normal temperature. The first prepreg is wound around the mandrel 22 by the filament winding apparatus 20 and stacked.

  The second winding step is a step of winding the second prepreg around the mandrel 22 around which the first prepreg is wound. The second prepreg is formed by impregnating the fiber bundle with the second resin. The fiber bundle included in the second prepreg is preferably a fiber bundle of the same type as the fiber bundle included in the first prepreg. The second prepreg is formed such that the resin content (resin content) of the second resin is smaller than the resin content of the first resin contained in the first prepreg. The second resin is preferably a synthetic resin having a resin viscosity of 100 mPas or less at normal temperature. The second prepreg is wound and laminated on the mandrel 22 around which the first prepreg is wound by the filament winding apparatus 20.

  The third winding step is a step of winding the third prepreg around the mandrel 22 around which the second prepreg is wound. The third prepreg is formed by impregnating the fiber bundle with a third resin. The fiber bundle included in the third prepreg is preferably a fiber bundle of the same type as the fiber bundle included in the first prepreg or the second prepreg. The third prepreg is formed so that the resin content of the third resin is smaller than the resin content of the second resin contained in the second prepreg. The third resin is preferably a synthetic resin having a resin viscosity of 100 mPas or less at normal temperature. The third prepreg is wound and laminated on the mandrel 22 around which the second prepreg is wound by the filament winding apparatus 20.

  FIG. 4 is a cross-sectional view showing a laminate 40 in which the first prepreg, the second prepreg, and the third prepreg are wound around the mandrel 22 and laminated. The stacked body 40 includes a first layer 42, a second layer 44, and a third layer 46. The first layer 42 is a layer formed by winding the first prepreg around the mandrel 22, the second layer 44 is a layer formed by winding the second prepreg, and the third layer 46 is the first layer 46. It is a layer formed by winding 3 prepregs. The first to third prepregs are wound around the mandrel 22 under a predetermined tension. Therefore, a part of the first resin contained in the first prepreg flows out from the first layer 42 to the second layer 44 or the third layer 46, and a part of the second resin contained in the second prepreg is discharged. , Flows from the second layer 44 to the third layer 46 and flows out.

  And the laminated body 40 is heat-hardened with a resin hardening furnace etc., and a fiber reinforced composite material is shape | molded. Here, the resin content of the second prepreg is smaller than the resin content of the first prepreg, and the resin content of the third prepreg is smaller than the resin content of the second prepreg. Since the resin content of the first prepreg is the largest, when there is no outflow of the first resin, the cured first layer 42 has the largest resin volume content. Conversely, since the resin content of the third prepreg is the smallest, when there is no inflow of the first resin or the second resin, the cured third layer 46 has the smallest resin volume content. However, as described above, a part of the first resin contained in the first prepreg flows out from the first layer 42 to the second layer 44 or the third layer 46, and a part of the second resin contained in the second prepreg. Flows out from the second layer 44 to the third layer 46. Therefore, the first layer 42 has the largest resin volume content and the third layer 46 has the smallest resin volume content of the fiber reinforced composite material obtained by curing and molding the laminate 40 in which the first prepreg to the third prepreg are laminated.

  According to the above configuration, the mandrel 22 is wound with the first prepreg formed by impregnating the fiber bundle with the first resin, and the mandrel 22 around which the first prepreg is wound has a resin content smaller than that of the first prepreg. A second prepreg formed by impregnating the fiber bundle with the second resin, the mandrel 22 around which the second prepreg is wound has a resin content smaller than that of the second prepreg, and the fiber bundle When the third prepreg formed by impregnating the third resin is wound on the fiber reinforced composite material to form a fiber reinforced composite material, a decrease in the resin volume content in the inner layer of the fiber reinforced composite material can be suppressed.

  In addition, although the form for implementing this invention was demonstrated, this invention is not limited to said embodiment at all, and can be implemented with a various form in the range which does not deviate from the summary of this invention. Of course. For example, in the above-described embodiment, the fiber reinforced composite material is formed of three layers, but is not limited to three layers and may be two layers or the like. In the above embodiment, the case where a prepreg is used in the fiber-reinforced composite material molding method is shown. For example, instead of using a prepreg in which a fiber bundle is impregnated with a resin in advance, a resin impregnation apparatus or the like is used. The present invention can also be applied when the fiber bundle is impregnated with an uncured resin.

In embodiment of this invention, it is a figure which shows the structure of a fiber reinforced composite material shaping | molding system. In embodiment of this invention, it is a flowchart which shows the fiber reinforced composite material shaping | molding method. In embodiment of this invention, it is sectional drawing which shows the laminated body which wound and laminated | stacked the 1st prepreg, the 2nd prepreg, and the 3rd prepreg on the mandrel. In embodiment of this invention, it is sectional drawing which shows the laminated body which wound and laminated | stacked the 1st prepreg, the 2nd prepreg, and the 3rd prepreg on the mandrel.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 Fiber reinforced composite material shaping | molding system, 12 Fiber supply apparatus, 14 Prepreg, 16 Bobbin, 18 Fiber tension adjustment apparatus, 20 Filament wiping apparatus, 22 Mandrel, 24 Control apparatus, 26 Data logger, 30, 40 Laminate body, 32, 42 First layer, 34, 44 Second layer, 36, 46 Third layer.

Claims (8)

A fiber reinforced composite material molding method for molding a fiber reinforced composite material by winding a prepreg formed by impregnating a fiber bundle with a resin around a winding member,
A first winding step of winding the first prepreg around the winding member;
A second winding step of winding the second prepreg around the winding member around which the first prepreg is wound;
With
The first prepreg is formed by impregnating the fiber bundle with the first resin,
The second prepreg is formed by impregnating the fiber bundle with the second resin,
The fiber-reinforced composite material molding method, wherein the second resin has a thermal expansion coefficient larger than that of the first resin. The fiber-reinforced composite material molding method according to claim 1,
The winding member around which the second prepreg is wound includes a third winding step of winding the third prepreg,
The third prepreg is formed by impregnating the fiber bundle with a third resin,
The fiber-reinforced composite material molding method, wherein the thermal expansion coefficient of the third resin is larger than that of the second resin. A fiber reinforced composite material formed by winding a prepreg formed by impregnating a fiber bundle with a resin around a winding member,
The first prepreg formed by impregnating the fiber bundle with the first resin is wound on the winding member,
A winding member around which the first prepreg is wound is formed by winding a second prepreg formed by impregnating a fiber bundle with a second resin having a thermal expansion coefficient larger than that of the first resin. Fiber reinforced composite material. A fiber reinforced composite material according to claim 3,
A winding member around which the second prepreg is wound is formed by winding a third prepreg formed by impregnating a fiber bundle with a third resin having a thermal expansion coefficient larger than that of the second resin. Fiber reinforced composite material. A fiber reinforced composite material molding method for molding a fiber reinforced composite material by winding a prepreg formed by impregnating a fiber bundle with a resin around a winding member,
A first winding step of winding the first prepreg around the winding member;
A second winding step of winding the second prepreg around the winding member around which the first prepreg is wound;
With
The first prepreg is formed by impregnating the fiber bundle with the first resin,
The second prepreg is formed by impregnating the fiber bundle with the second resin,
The fiber reinforced composite material molding method, wherein the resin content of the second prepreg is smaller than the resin content of the first prepreg. The fiber-reinforced composite material molding method according to claim 5,
The winding member around which the second prepreg is wound includes a third winding step of winding the third prepreg,
The third prepreg is formed by impregnating the fiber bundle with a third resin,
The fiber reinforced composite material molding method, wherein the resin content of the third prepreg is smaller than the resin content of the second prepreg. A fiber reinforced composite material formed by winding a prepreg formed by impregnating a fiber bundle with a resin around a winding member,
The first prepreg formed by impregnating the fiber bundle with the first resin is wound on the winding member,
The winding member around which the first prepreg is wound has a resin content smaller than that of the first prepreg, and is formed by winding the second prepreg formed by impregnating the fiber bundle with the second resin. Characteristic fiber reinforced composite material. A fiber reinforced composite material according to claim 7,
The winding member around which the second prepreg is wound has a resin content smaller than that of the second prepreg, and is formed by winding a third prepreg formed by impregnating the fiber bundle with the third resin. Characteristic fiber reinforced composite material.

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