JP2004249592A - Method for manufacturing fiber composite material and hollow structure equipped with the fiber composite material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To manufacture a fiber composite material having high strength by suppressing the shrinkage of the fibers of a preform in a method for manufacturing the fiber composite material by an RTM method and to prevent the preform from getting out of shape at the time of injection of a resin. <P>SOLUTION: The surfaces of the flange parts 1b and 1c of the preform 10 arc pressed by a press plate 11 having pawl-shaped projections 11a on both sides thereof so as to apply tension to the surfaces of the flange parts 1b and 1c of the preform 10. The resin is introduced from a resin injection port 18 while applying tension to the flange parts 1b and 1c and injected from both sides of the lower flange part 1c pressed by the pawl-shaped projections 11a. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for producing a fiber composite material and a hollow structure provided with the fiber composite material.
[0002]
[Prior art]
BACKGROUND ART Conventionally, a fiber composite material in which a fiber reinforcing material is provided inside a resin has been used in various fields. As a method for producing this kind of fiber composite material, a method of impregnating a resin into a fibrous material (preform) formed into a predetermined shape, that is, a RTM (Resin Transfer Molding) molding method is known (for example, Patent Reference 1).
[0003]
There are various methods for producing a preform, for example, a method of cutting out a part of a fiber woven fabric and stacking them (hand lay-up method), or a method of weaving into a predetermined shape using a loom or the like. (Blading method) and the like are known.
[0004]
[Patent Document 1]
JP, 2002-337244, A
[Problems to be solved by the invention]
However, since the resin generally has a high viscosity, a part of the fiber is easily washed away by the resin when the resin is injected into the preform. Therefore, the preform may be easily deformed during resin injection, and as a result, the quality of the fiber composite material may be deteriorated.
[0006]
The present invention has been made in view of such a point, and an object of the present invention is to prevent a preform from being deformed at the time of injecting a resin, and to produce a fiber composite material having a uniform shape.
[0007]
[Means for Solving the Problems]
A first manufacturing method according to the present invention is a method for manufacturing a fiber composite material by impregnating a molded fibrous body with a resin, and includes a jig having a holding surface on which at least one or more projections are formed. Pressing the fibrous body against the surface of the fibrous body by pressing the fibrous body with the protrusions; and impregnating the fibrous body with a resin while holding down the surface of the fibrous body with the jig. Curing the resin while holding down the surface of the fibrous body with a tool.
[0008]
According to the first manufacturing method, the fibrous body is fixed by the jig when the resin is impregnated. In particular, the fibrous body of the fibrous body is firmly fixed by a strong pressing force by the protrusion of the jig. Is prevented from being swept away. Therefore, the shape of the fibrous body is hardly lost. Therefore, a high-quality fiber composite material having a uniform shape can be obtained.
[0009]
A second manufacturing method is a method of manufacturing a fiber composite material by impregnating a resin into a formed fibrous body, and a jig having a holding surface having projections formed on both sides is formed by using the jigs with the fibers. Pressing both sides of the surface of the body against the surface of the fibrous body, and pressing the surface of the fibrous body with the jig so as to maintain the tension of the surface of the fibrous body, A method comprising: impregnating a resin; and curing the resin while holding down the surface of the fibrous body with the jig so as to maintain the surface tension of the fibrous body.
[0010]
Also in the second manufacturing method, the fibrous body is fixed by the jig when the resin is impregnated. In particular, since the fibrous body is firmly fixed by the strong pressing force by the projection of the jig, the fibers of the fibrous body are fixed by the injected resin. It is prevented from being swept away. Therefore, the fibrous body hardly loses its shape, and a high-quality fiber composite material having a uniform shape can be obtained.
[0011]
By the way, if the fibers of the preform are crimped, the fibers will remain in a crimped state inside the composite material when the resin is subsequently impregnated and cured. However, if the fiber in the composite material is in a crimped state, the fiber cannot exhibit its original tensile strength.
[0012]
However, according to the second manufacturing method, the fiber body slightly bends to the back side, and tension is generated on the front side because the projections of the jig press down the both sides of the surface of the fiber body. Therefore, the shrinkage of the fibers of the fibrous body is suppressed. The impregnation of the fibrous body with the resin and the curing of the resin are performed while the fibrous body is pressed by the jig. Therefore, the impregnation and curing of the resin are performed in a state where the fibrous body is pulled. Therefore, the fibers inside the resin are maintained in a state without shrinkage or in a state with little shrinkage, so that a fiber composite material with high strength can be obtained.
[0013]
The third manufacturing method includes a step of winding the fibers around the first and second mandrels while applying tension, a step of superposing the two mandrels on which the fibers are wound in parallel, and a step of superposing the two mandrels in an overlapping manner. Arranging a fibrous body covering at least a part of the fiber on the side surface on the side surface intersecting the portion, and pressing the fiber wound around each of the mandrels against each other at an overlapping portion of the two mandrels; Pressing a jig having a pressing surface on which projections are formed on the mandrel side from the surface side of the fibrous body by pressing both side portions of the surface of the fibrous body with the protrusions; and While pressing the fibrous body and each of the fibers, the overlapping portion and the pressing portion of each of the fibers are not included. A step of removing a part, a step of impregnating the fibrous body and each of the fibers with a resin while pressing the fibrous body and each of the fibers with the jig, and pressing the fibrous body and each of the fibers with the jig While curing the resin.
[0014]
In the third manufacturing method as well, the fibrous body is prevented from being deformed similarly to the second manufacturing method, so that a fiber composite material having a uniform shape can be obtained.
[0015]
Further, according to the third manufacturing method, since the both sides of the fibrous body are pressed by the projections of the jig, tension is generated on the surface of the fibrous body, and the tension of the fiber wound around the mandrel is maintained. It is. Moreover, since a part of the fiber is removed while the fiber body is pressed by the jig, the fiber shape can be processed into a predetermined shape while maintaining the tension of the fiber body and the fiber. Therefore, it is possible to obtain a preform having a complicated shape in a pretensioned state. Further, since the resin is impregnated and cured while the fiber body is pressed by the jig, the fibers inside the resin are maintained in a state of no shrinkage or in a small state, and a fiber composite material having high strength is obtained.
[0016]
The fourth manufacturing method is a method of manufacturing a long fiber composite material having an I-shaped cross section, and applying a tension to each of the first and second mandrels having a rectangular or substantially rectangular cross section while applying tension. Winding, the step of superimposing the side surfaces of both mandrels around which the fibers are wound in parallel, and on both side surfaces intersecting the superimposed surface of the two superposed mandrels, at least a part of the fiber on each side surface. A step of arranging the planar fiber bodies to be covered, and a jig having a pressing surface with projections formed on both sides thereof, and pressing the projections on both sides of the surface of the fiber bodies with the projections, thereby observing the surface side of the fiber bodies. And pressing the respective fibrous bodies and the respective fibers with the jig while removing unpressed portions of the respective fibers. Performing a step of impregnating the fibrous body and the fibers with a resin while pressing the fibrous bodies and the fibers with the jig, and pressing the fibrous bodies and the fibers with the jig While curing the resin.
[0017]
According to the fourth manufacturing method, similarly to the third manufacturing method, it is possible to obtain a long fiber composite material having a high strength and a well-shaped I-shaped cross section.
[0018]
In a fifth manufacturing method, in any one of the first to fourth manufacturing methods, the step of impregnating the resin may include the step of injecting the resin from the vicinity of a portion of the fibrous body pressed by the protrusion of the jig. It is a method that consists of.
[0019]
A sixth manufacturing method is a method according to any one of the second to fourth manufacturing methods, wherein the step of impregnating the resin includes the step of injecting the resin from both sides of the fibrous body. In addition, both sides here mean the both sides of the front surface or the back surface of the fibrous body, or both sides of the fibrous body.
[0020]
According to each of the fifth and sixth manufacturing methods, since the resin is injected from the most firmly fixed portion of the fibrous body, it is possible to more effectively prevent the fibrous body from being deformed. it can.
[0021]
The hollow structure according to the present invention is a hollow structure including an outer plate and a reinforcing member for reinforcing the outer plate, wherein the reinforcing member is manufactured by any one of the first to sixth manufacturing methods. It is formed of a fiber composite material.
[0022]
Thereby, a hollow structure having high strength can be obtained.
[0023]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0024]
The composite material according to the present invention is manufactured by a so-called RTM (Resin Transfer Molding) method. That is, the composite material according to the present invention is configured by impregnating a resin into a preform made of a fibrous body formed in a predetermined shape. First, as one embodiment, a method for manufacturing a reinforcing member having an I-shaped cross section will be described.
[0025]
First, as shown in FIG. 1, a fiber 1 as a fiber reinforcing material is wound around first and second mandrels 2A and 2B having a substantially rectangular cross section. At this time, a sufficient tension is applied to the fiber 1 so that the fiber 1 does not shrink. That is, the fiber 1 is wound around the mandrels 2A and 2B while applying tension. Here, as a method for applying tension relatively easily, a so-called filament winding method in which the fiber 1 is continuously wound is used. However, the method of winding the fiber 1 is not particularly limited as long as it can be wound while applying tension. For example, a plurality of fibers 1 may be wound around the mandrels 2A and 2B in a predetermined pattern by using a loom or the like (blading method). In this embodiment, the fibers 1 are made of carbon fibers.
[0026]
Next, as shown in FIG. 2, the two mandrels 2A and 2B are arranged in parallel and their side surfaces are overlapped. At this time, it is preferable that both mandrels 2A and 2B be pressed together so as to maintain the tension of the fiber 1 of each mandrel 2A and 2B. In the present embodiment, a round (roundness) 2c is formed at a corner of a superposed surface (hereinafter, referred to as a contact surface) of each of the mandrels 2A and 2B (however, in FIGS. 5 and 7). , Are not shown). This prevents the fibers 1 from being damaged at the corners of the mandrels 2A, 2B, and also prevents the flanges (horizontal portions of the fibers 1 wound on the mandrels 2A, 2B and the flat fiber fabric 3) 1b, 1c and the web portions. This is to avoid stress concentration at the (vertical portion) 1a (see FIG. 7). However, the radius 2c of the mandrels 2A and 2B may be appropriately set according to the strength of the fiber 1 or the like, and is not necessarily required.
[0027]
Next, two flat fiber fabrics 3 extending in the axial direction of the mandrels 2A and 2B are prepared, and these fiber fabrics 3 are arranged on the upper and lower side surfaces of the mandrels 2A and 2B. This fiber fabric 3 is made of carbon fiber. In the present embodiment, the depressions 5 are formed in the overlapping portions (strictly speaking, both side portions of the contact surface) of the mandrels 2A and 2B by the radius 2c formed at the corners of the mandrels 2A and 2B. Is done. Therefore, the filler 4 is inserted into the depression 5 before the fiber fabric 3 is overlaid on the fibers 1 of the mandrels 2A and 2B. However, although not shown, depending on the shape of the mandrels 2A and 2B, there may be no depression at the overlapping portion of the mandrels 2A and 2B. In such a case, the insertion of the filler 4 is unnecessary. On the other hand, even if the rounds 2c are not formed at the corners of the mandrels 2A and 2B, a dent may be formed at the overlapping portion of the mandrels 2A and 2B. In such a case, it is preferable to insert a filler into the depression. In addition, the material of the filler 4 is not particularly limited, but here, the filler 4 is formed of carbon fiber.
[0028]
Next, the pressing plate 11 is pressed from above the fiber fabric 3 on the upper surface side and the pressing plate 11 is pressed from below the fiber fabric 3 on the lower surface side so as to maintain the tension of the fiber 1 wound on the mandrels 2A and 2B. Press. That is, by pressing both mandrels 2A and 2B around which the fiber 1 is wound and the fiber fabric 3 from above and below with the press plate 11, the fiber 1 and the fiber fabric 3 are sandwiched between the press plate 11 and the mandrels 2A and 2B.
[0029]
In the present embodiment, the pressing surface of the pressing plate 11 is provided with claw-shaped protrusions 11a on both sides in the width direction (the left-right direction in FIG. 2). On the other hand, step portions are formed on both sides of the back surface (the surface opposite to the pressing surface) of the pressing plate 11. The claw-shaped protrusions 11a extend in the longitudinal direction of the holding plate 11 (the front and back directions in FIG. 2), and are configured to press both side portions of the fiber fabric 3 over the entire longitudinal direction. Thus, the pressing plate 11 presses the fiber 1 and the fiber fabric 3 over the entire pressing surface, and locally presses both side portions of the fiber fabric 3 with the claw-like protrusions 11a with a larger pressing force. As a result, as shown in FIG. 3, the fiber fabric 3 receives a force that bends outward. Therefore, tension is applied to the outer surface of the fiber fabric 3.
[0030]
Thereafter, a part of the fiber 1 is cut so that the cross section of the fiber 1 and the fiber woven fabric 3 becomes an I shape while pressing the fiber 1 and the fiber woven fabric 3 with the pressing plate 11 so as to maintain the tension of the fiber 1 and the fiber woven fabric 3. I do. Here, the unpressed portion of the fiber 1, that is, the fiber 1 at the outer portions of both mandrels 2A and 2B in FIG. 2 is removed. As a result, as shown in FIG. 4, a preform 10 having an I-shaped cross section including the fiber 1, the filler 4, and the fiber fabric 3 is obtained.
[0031]
Next, as shown in FIG. 5, a molding jig 25 is assembled around the preform 10, the mandrels 2A and 2B, and the holding plate 11 while maintaining the tension of the fibers of the preform 10. Specifically, the metal fitting 12 is arranged on the step on the back surface of the holding plate 11, and the metal fitting 12 and the mandrels 2A and 2B are connected by a fastener (not shown) such as a bolt. By this connection, the metal fitting 12 is pressed against the mandrels 2A and 2B, so that the pressing force of the pressing plate 11 is maintained, and the tension of the fiber 1 and the fiber fabric 3 of the preform 10 is maintained. Thereafter, the whole is surrounded and sealed by the heaters 13, 14A, 14B, 15 composed of block bodies. A resin inlet 18 is formed in the lower heater 14B, and a resin outlet 17 is formed in the upper heater 14A. In this embodiment, two resin inlets 18 and two resin outlets 17 are provided. However, the numbers of the resin inlets 18 and the resin outlets 17 are not limited at all.
[0032]
Next, the molding jig 25 is incorporated in the manufacturing apparatus. FIG. 6 is a configuration diagram illustrating an example of an apparatus for manufacturing a composite material. The manufacturing apparatus 30 includes a tank 31 for storing the resin 20, a pump 32 for conveying the resin 20 in the tank 31, a resin trap 35, and a vacuum pump 36.
[0033]
The discharge side of the pump 32 is connected to a resin injection passage 38 for guiding the resin. The resin injection passage 38 branches off in the middle, and each of the branched paths is connected to the resin injection port 18 of the molding jig 25. An injection valve 33 is provided in each of the branched paths.
[0034]
A resin discharge passage 39 is connected to the resin discharge port 17 of the molding jig 25, and a downstream side of the resin discharge passage 39 is connected to a resin trap 35. The resin discharge passage 39 is provided with a discharge valve 34. The vacuum pump 36 is provided on the downstream side of the resin trap 35, and the vacuum pump 36 and the resin trap 35 are connected via a pipe.
[0035]
The molding jig 25 is provided with a temperature control panel 40. The temperature control panel 40 controls the temperature inside the molding jig 25 by adjusting the supply current to the heaters 13, 14A, 14B, 15.
[0036]
When impregnating the preform 10 with the resin, the injection valve 33 and the discharge valve 34 are opened, and the resin is injected from the resin injection port 18 of the molding jig 25. As shown in FIG. 7, the resin injected from the resin injection port 18 flows through the gap between the lower holding plate 11 and the heater 14 </ b> B, and goes around both sides of the holding plate 11 so that the preform 10 It flows into the lower flange portion 1c. That is, the resin is injected from both sides of the lower flange portion 1c.
[0037]
As shown in FIG. 8, both ends of the lower flange portion 1c of the preform 10 are sandwiched between the claw-like projections 11a of the holding plate 11 and the mandrels 2A and 2B, and are fixed with a stronger pressing force than other portions. ing. Therefore, the fibers of the preform 10 are prevented from being washed away by the resin 20. Therefore, the preform 10 can be prevented from being deformed during resin injection. In particular, in the present embodiment, the resin is injected from the vicinity of the claw-shaped protrusion 11a of the preform 10, so that the resin injection portion is most firmly fixed. Therefore, the deformation of the preform 10 can be more effectively prevented.
[0038]
The resin flowing from the lower flange portion 1c flows through the preform 10 in the order of the web portion 1a and the upper flange portion 1b, and then flows through the gap between the upper holding plate 11 and the heater 14A. Is discharged.
[0039]
After the entire preform 10 is impregnated with the resin 20, the injection valve 33 and the discharge valve 34 are closed, and the operations of the injection pump 32 and the vacuum pump 36 are stopped. Then, heating by the heaters 13, 14A, 14B, 15 is started to cure the resin. When the curing of the resin is completed, the molding jig 25 is disassembled. As a result, a reinforcing member composed of a long object having a cross-sectional shape of I is obtained.
[0040]
As described above, according to this embodiment, the fiber 1 wound around the mandrels 2A and 2B while applying tension is processed into a predetermined shape (I-shaped cross section) while maintaining the tension, and the tension is further maintained. The resin can be impregnated and cured as it is. Therefore, the shrinkage of the fibers in the resin can be prevented or suppressed, and the original strength of the fibers can be exhibited. Therefore, a fiber composite material having high strength can be manufactured.
[0041]
A fiber fabric 3 is covered as a reinforcing material on the side surfaces of both mandrels 2A and 2B, and the fiber 1 wound around both mandrels 2A and 2B and the fiber fabric 3 are both impregnated in resin, so that a fiber composite of higher strength is obtained. Material can be obtained.
[0042]
In addition, since both sides of the fiber fabric 3 are pressed by the pressing plate 11 having the claw-like projections 11a, tension can be applied not only to the fiber 1 wound around the mandrels 2A and 2B, but also to the fiber fabric 3. Therefore, the strength of the fiber composite material can be further increased.
[0043]
Also, since the pressing plate 11 having the claw-shaped projections 11a presses both side portions of the fiber fabric 3, it is possible to prevent the fibers of the preform 10 from being washed away by the resin at the time of injecting the resin. Shape collapse can be prevented. In particular, since the resin is injected from the vicinity of the portion pressed by the claw-shaped projections 11a, it is possible to effectively prevent the preform 10 from being deformed.
[0044]
In addition, since the filler 4 is inserted into the depression 5 at the overlapping portion of the two mandrels 2A and 2B, a fiber composite material having higher strength can be obtained.
[0045]
Since the fibers 1 are wound around the mandrels 2A and 2B using the filament winding method, tension can be easily and reliably applied to the fibers 1.
[0046]
As described above, conventionally, it has been difficult to apply pretension to a preform having a complicated shape such as a long object having an I-shaped cross section. Pretension can be applied to preforms having various shapes.
[0047]
In the above-described embodiment, the claw-shaped protrusions 11a of the holding plate 11 are formed in a shape that spreads outward, but the shape of the protrusions of the holding plate 11 is not particularly limited. Further, the projections of the holding plate 11 are not limited to the projections 11a on both sides, and projections may be provided on other portions in addition to the projections 11a on both sides. For example, the protrusion may be provided over the entire outer peripheral portion of the pressing surface of the pressing plate 11. That is, the holding plate 11 may be formed in a lid shape. Further, in addition to the projections on both sides, it is also possible to provide projections at the center of the pressing surface or the like.
[0048]
When it is not particularly necessary to apply pretension, the pressing plate 11 may have only one claw-like projection 11a (however, it is needless to say that there may be two or more). Even with one claw-shaped protrusion 11a, it is possible to prevent the preform from being deformed. Also in this case, it is preferable that the resin is injected from the vicinity of the claw-shaped protrusion 11a.
[0049]
The jig according to the present invention is not limited to a flat jig such as the holding plate 11, and may be a jig having another shape.
[0050]
In the above embodiment, the mandrels 2A and 2B have a substantially rectangular cross section, but the shapes of the mandrels 2A and 2B are not limited at all.
[0051]
The shape of the fiber fabric 3 is not limited to a flat plate shape, and various shapes can be adopted according to the side shapes of the mandrels 2A and 2B. Further, the fibrous body according to the present invention is not limited to a woven fabric.
[0052]
In the above-described embodiment, the mandrels 2A, 2B are pressed using two holding plates 11 so as to sandwich the mandrels 2A, 2B. It is also possible to maintain the tension of the fibers 1. That is, the two mandrels 2A and 2B may be pressed against each other at the overlapped portion, and the portions of the mandrels 2A and 2B separated in the circumferential direction from the overlapped portion may be pressed by the holding plate 11. Thus, a reinforcing member having a J-shaped cross section, a reinforcing member having a T-shaped cross section, and the like can be manufactured.
[0053]
In the above embodiment, two mandrels 2A and 2B are used, but it is also possible to manufacture a fiber composite material using one mandrel. For example, a reinforcing member having a C-shaped cross section can be manufactured using one mandrel. Moreover, it is also possible to manufacture a fiber composite material using three or more mandrels in the same manner as in the above embodiment.
[0054]
The materials of the fiber 1, the fiber fabric 3, and the filler 4 are not limited to carbon fibers, and other materials may be used. Different materials can be used.
[0055]
The reinforcing member can be used for various uses, including reinforcing a hollow structure. For example, as shown in FIG. 9, in an aircraft wing 51 including a spar 52 and an outer plate 53, the spar 52 may be formed by the reinforcing member. Further, the reinforcing member may be used for other wing structures such as a blade of a windmill.
[0056]
Further, the reinforcing member may be used for other hollow structures (for example, the fuselage of an aircraft or a vehicle) or a building. In addition, the fiber composite material according to the present invention can be used not only as a reinforcing member but also for other uses. The shape is not limited to the girder structure. The shape, size, application, and the like of the fiber composite material according to the present invention are not limited at all.
[0057]
【The invention's effect】
According to the present invention, when impregnating the resin, the fibrous body can be firmly fixed by the projection of the jig, so that the fibers of the fibrous body can be prevented from being washed away by the resin, and the Shape collapse can be prevented. Therefore, a fiber composite material having a regular shape can be obtained.
[0058]
Further, according to the present invention, the resin can be impregnated and cured while applying tension to the fibrous body, so that the shrinkage of the fiber inside the resin can be suppressed. Therefore, the original strength of the fiber can be exhibited, and the strength of the fiber composite material can be increased.
[0059]
If the resin is injected from the vicinity of the portion of the fibrous body pressed by the projection of the jig or from both sides of the fibrous body, the fibrous body can be effectively prevented from being deformed.
[0060]
Further, according to the present invention, a hollow structure having high strength can be obtained.
[Brief description of the drawings]
FIG. 1 is a plan view of a mandrel around which fibers are wound.
FIG. 2 is an exploded view of a mandrel around which fibers are wound, a fiber fabric, and a holding plate.
FIG. 3 is a conceptual diagram showing a state in which tension is applied to a fiber fabric.
FIG. 4 is an assembly diagram of a mandrel around which fibers are wound, a fiber fabric, and a holding plate.
FIG. 5 is an exploded perspective view of a molding jig.
FIG. 6 is a configuration diagram of an apparatus for producing a fiber composite material.
FIG. 7 is an internal sectional view of a molding jig.
FIG. 8 is a partially enlarged sectional view of the inside of a molding jig.
FIG. 9 is a sectional view of a wing.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Fiber 2A 1st mandrel 2B 2nd mandrel 2c R 3 Fiber woven fabric (fibrous body)
4 Filler 5 Depression of overlapped portion 10 Preform 11 Holding plate (jig)
11a Claw-like projection (projection)
12 Metal fitting 13 Heater 14A, 14B Heater 15 Heater 17 Resin discharge port 18 Resin injection port 20 Resin 25 Molding jig 30 Manufacturing apparatus 51 Wing (hollow structure)
52 digits 53 outer panel

Claims (7)

A method for producing a fiber composite material by impregnating a resin into a molded fibrous body,
Pressing a jig having a pressing surface on which at least one projection is formed, against the surface of the fibrous body so as to press the fibrous body with the projections;
A step of impregnating the fibrous body with a resin while holding down the surface of the fibrous body with the jig,
While pressing the surface of the fibrous body with the jig, curing the resin,
A method for producing a fiber composite material, comprising: A method for producing a fiber composite material by impregnating a resin into a molded fibrous body,
A jig having a holding surface with projections formed on both sides, and pressing the jig against the surface of the fibrous body by pressing both side portions of the surface of the fibrous body with the projections,
A step of impregnating the fibrous body with a resin while holding down the surface of the fibrous body with the jig so as to maintain the tension on the surface of the fibrous body,
A step of curing the resin while holding down the surface of the fibrous body with the jig so as to maintain the tension of the surface of the fibrous body,
A method for producing a fiber composite material, comprising: Winding the fibers around the first and second mandrels while applying tension, respectively;
A step of superposing the two mandrels wound with the fibers in parallel,
A step of arranging a fibrous body that covers at least a part of the fibers on the side surface on a side surface that intersects an overlapping portion of the two overlapping mandrels,
The fibers wound around each of the mandrels are pressed against each other at the overlapping portion of the two mandrels, and a jig having a pressing surface with projections formed on both sides is provided with the projections on both sides of the surface of the fibrous body. Pressing the mandrel side from the surface side of the fibrous body so as to press,
While pressing the fibrous body and each of the fibers with the jig, a step of removing a portion that does not include the overlapped portion and the pressed portion of each of the fibers,
A step of impregnating the fibrous body and each fiber with a resin while pressing the fibrous body and each fiber with the jig,
A step of curing the resin while pressing the fibrous body and each fiber with the jig,
A method for producing a fiber composite material, comprising: A method for producing a long fiber composite material having an I-shaped cross section,
A step of winding the fiber while applying tension to each of the first and second mandrels having a rectangular or substantially rectangular cross section;
A step of superposing the side surfaces of both mandrels around which the fibers are wound in parallel,
A step of arranging a plate-like fibrous body covering at least a part of the fiber on each side surface on both side surfaces intersecting a superimposed surface in the two overlapping mandrels,
A step of pressing a jig having a pressing surface with projections formed on both sides from the surface side of the fibrous body to the mandrel side so as to press both side portions of the surface of the fibrous body with the projections,
While pressing each of the fibrous body and each of the fibers with the jig, a step of removing a portion of each of the fibers that is not pressed,
A step of impregnating the fibrous body and the fibers with a resin while pressing the fibrous bodies and the fibers with the jig,
A step of curing the resin while pressing the fibrous bodies and the fibers with the jig,
A method for producing a fiber composite material, comprising: The step of impregnating the resin comprises a step of injecting the resin from the vicinity of a portion of the fibrous body pressed by the protrusion of the jig, The resin is impregnated with the resin. A method for producing a fiber composite material. The method for producing a fiber composite material according to any one of claims 2 to 4, wherein the step of impregnating the resin includes a step of injecting the resin from both sides of the fibrous body. A hollow structure comprising an outer plate and a reinforcing member for reinforcing the outer plate, wherein the reinforcing member is formed of a fiber composite material manufactured by the manufacturing method according to any one of claims 1 to 6. A hollow structure, characterized in that:

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