WO2015093418A1

WO2015093418A1 - Composite material manufacturing method and composite material

Info

Publication number: WO2015093418A1
Application number: PCT/JP2014/083056
Authority: WO
Inventors: 亜希井上; 栗村　隆之
Original assignee: 三菱重工業株式会社
Priority date: 2013-12-20
Filing date: 2014-12-12
Publication date: 2015-06-25
Also published as: JP2015120270A

Abstract

The purpose of the present invention is to provide a composite material manufacturing method with which product deformation due to spring back can be reduced and a composite material for which said method was used. This composite material manufacturing method is characterized in comprising: a molding step (S11) for disposing a composite material in a molding jig and molding the composite material into an intended shape by laminating; a curing step (S12) for heating and curing the composite material disposed in the molding jig while applying vibration to the molding jig and/or the composite material after heating and curing; and a product removal step (S13) for removing the heated and cured composite material product from the molding jig.

Description

Composite material manufacturing method and composite material

The present invention relates to a method for manufacturing a composite material and a composite material using the same, and more particularly to a method for manufacturing a composite material and a composite material that can reduce springback during manufacturing.

Conventionally, in the fields of energy development materials and aerospace structural materials, composite materials capable of improving heat resistance and specific strength have been highlighted. In a conventional method for manufacturing a composite material, a fiber sheet is sandwiched between an outer molding jig and a composite material such as a fiber sheet disposed in the opening of an outer molding jig having an opening. The inner molding jig (core member) is disposed in the opening of the outer molding jig. In the conventional composite material manufacturing method, the fiber sheet is heat-cured in a state where the fiber sheet is sandwiched between the outer forming jig and the inner forming jig, and the outer heat-cured fiber sheet is used for outer forming. The composite material is manufactured by removing the fiber sheet from the jig and the inner molding jig.

JP 2001-341209 A

By the way, in the conventional method for manufacturing a composite material, there is a case where a composite material having a U-shaped cross section having a pair of opposed flat plate portions and a connecting portion connecting both ends of the pair of flat plate portions may be manufactured. In this case, when removing the heat-cured fiber sheet from the outer forming jig, the fiber sheet of each layer is cured before obtaining a deviation corresponding to the bending degree. Residual stress may occur in this part. The product may be deformed inward (see arrow D) when removing the heat-cured fiber sheet from the outer forming jig and the inner forming jig due to the spring back based on the residual stress.

For this reason, in the conventional method for manufacturing a composite material, an outer molding jig is provided by placing a support member in a state where elastic deformation is applied to the fiber sheet between a pair of opposed flat plate portions of the inner molding jig. And the deformation of the product based on the residual stress when removing the product from the inner forming jig is reduced.

However, in the conventional composite material manufacturing method, even when the support member is arranged, the influence of the residual stress between the pair of flat plate portions and the connection portions cannot be sufficiently removed, and the product by springback There is a situation in which a method of manufacturing a composite material that can sufficiently reduce the deformation of is desired.

The present invention has been made in view of such circumstances, and provides a method for producing a composite material that can reduce deformation of a product due to springback based on residual stress during molding, and a composite material using the same. Objective.

The composite material manufacturing method of the present invention includes a molding step in which a composite material is arranged in a molding jig, the composite material is laminated and molded into a desired shape, and the molding jig and the composite material after molding. A curing step of heating and curing the composite material disposed on the molding jig while applying vibration to at least one of the vibration applying means, and removing the heat-cured composite material product from the molding jig And a product removal step.

According to this method, the composite material can be gradually cured by heating while applying vibration to the composite material in which a plurality of layers are laminated. It can be solidified into a shape. As a result, the composite material can be molded while relieving the residual stress generated in the composite material at the time of molding. Therefore, a method for manufacturing the composite material that can reduce the deformation of the product due to the spring back can be realized.

In the method for producing a composite material of the present invention, the forming jig includes a pair of flat plate portions and an outer forming jig having a connection portion for connecting the pair of flat plate portions, a pair of flat plate portions, and the pair of flat plate portions. An inner molding jig having a connecting portion for connecting a flat plate portion, and sandwiching the composite material between the inner molding jig and the outer molding jig to heat the composite material preferable. By this method, even when molding a composite material using a molding jig having a U-shaped cross section having a pair of flat plate portions that are largely deformed by springback and a connecting portion that connects the pair of flat plate portions, Since the composite material can be molded while relaxing the residual stress generated in the composite material during molding, the deformation of the product due to the spring back can be further reduced.

In the method for producing a composite material of the present invention, it is preferable that in the curing step, the composite material is heated and cured in a state where a central portion of the molding jig is fixed. This method gradually shifts the position of the composite material from the center of the fixed forming jig toward both ends, so it is possible to generate a position shift approximately evenly from the center to both ends. It becomes. Accordingly, even when a molding jig having a complicated shape such as an M-shaped cross section is used, the deformation of the product due to the spring back can be more efficiently reduced.

In the method for producing a composite material of the present invention, it is preferable that in the curing step, the composite material is heated and cured in a state where one end and / or both ends of the forming jig are fixed. This method gradually shifts the position of the composite material from one end and / or both ends of the fixed forming jig toward the central portion, so that it is positioned substantially evenly toward the one end and / or both ends. Deviation can be generated, and deformation of the product due to springback can be further reduced. And since it becomes unnecessary to perform the processing (cutting process) of the composite material at one end and / or both ends where the forming jig is fixed, the working time can be shortened.

The composite material manufacturing method of the present invention includes a molding step in which a composite material is arranged in a molding jig, the composite material is laminated and molded into a desired shape, and the composite material arranged in the molding jig. A vacuum suction process for vacuum suction of the film member, a liquid resin sealing process for sealing the liquid resin in the film member and impregnating the liquid resin between the composite materials, and the molding A curing step of heating and curing the composite material disposed in the molding jig while applying vibration to the at least one of the jig and the composite material impregnated with the liquid resin by vibration applying means; and the molding jig. And a product removal step of removing the product of the composite material after heat curing from a tool.

According to this method, the composite material can be gradually cured by heating while applying vibration to the composite material in which a plurality of layers are laminated. It becomes possible to solidify into the shape of. As a result, the residual stress generated in the composite material at the time of molding can be relieved, and the composite material can be molded while reducing the porosity accompanying the encapsulation of the liquid resin, so that the deformation of the product due to springback can be reduced. Can be realized.

In the method for producing a composite material according to the present invention, in the curing step, the molding jig and / or the composite material after thermoforming is vibrated by the vibration applying means by a plurality of vibration applying means. It is preferred to cure the material. By this method, since vibration is applied by a plurality of vibration applying means, the composite material can be solidified while relaxing the residual stress generated in the composite material at the time of molding, and deformation of the product due to springback can be further reduced.

In the composite material manufacturing method of the present invention, it is preferable that the vibration applying means is a vibrator that applies vibration to the composite material at a predetermined frequency. By this method, uniform and appropriate misalignment occurs in each layer before the laminated composite material is cured, so the difference in misalignment between each layer can be reduced compared to the case where vibration is applied intermittently and locally. The residual stress between each layer can be efficiently reduced.

The composite material of the present invention is obtained by the above-described composite material manufacturing method.

According to this configuration, the composite material is cured by heating while applying vibration to the composite material in which a plurality of layers are laminated. Therefore, the composite material is cured in a desired shape while mitigating misalignment caused by the formation of the plurality of laminate materials. To do. As a result, the composite material is molded while relieving the residual stress generated in the composite material during molding, so that deformation of the product due to the spring back of the composite material can be reduced.

According to the present invention, it is possible to realize a composite material manufacturing method capable of reducing deformation of a product due to springback based on residual stress during molding and a composite material using the same.

FIG. 1 is a flowchart of a method for manufacturing a composite material according to the first embodiment of the present invention. FIG. 2 is a schematic perspective view of the forming jig according to the first embodiment. FIG. 3A is an explanatory diagram of the method of manufacturing the composite material according to the first embodiment. FIG. 3B is an explanatory diagram of the method of manufacturing the composite material according to the first embodiment. FIG. 4 is an explanatory diagram of the method for manufacturing the composite material according to the first embodiment. FIG. 5A is a diagram illustrating another example of the curing step of the composite material manufacturing method according to the first embodiment. FIG. 5B is a diagram illustrating another example of the curing step of the method for manufacturing a composite material according to the first embodiment. FIG. 5C is a diagram showing another example of the curing step of the method for manufacturing the composite material according to the first exemplary embodiment. FIG. 6 is a diagram illustrating another example of the forming jig according to the first embodiment. FIG. 7A is a diagram illustrating another example of the curing step according to the first embodiment. FIG. 7B is a diagram illustrating another example of the curing step according to the first embodiment. FIG. 8 is a flowchart of the method for manufacturing a composite material according to the second embodiment of the present invention. FIG. 9A is a schematic view of a vacuum impregnation apparatus according to the second embodiment. FIG. 9B is a schematic diagram of a vacuum impregnation apparatus according to the second embodiment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In addition, this invention is not limited to each following embodiment, It can implement by changing suitably.

(First embodiment)
FIG. 1 is a flowchart of a method for manufacturing a composite material according to the first embodiment of the present invention. The composite material manufacturing method according to the present embodiment includes a molding step S11 in which a composite material is placed in a molding jig, the composite material is laminated and molded into a desired shape, and the molding jig and the molded jig A curing step S12 for heating and curing the composite material disposed on the molding jig while applying vibration to at least one of the composite materials, and a product removing step S13 for removing the cured composite material product from the molding jig. And including. Note that in the method for manufacturing a composite material according to the present embodiment, a CMC forming step of heating and baking the composite material to form CMC after the effect step may be performed.

First, the forming jig according to the present embodiment will be described with reference to FIG. FIG. 2 is a schematic perspective view of the forming jig 1 according to the present embodiment. The forming jig 1 according to the present embodiment includes a pair of an outer forming jig 11 and an inner forming jig 13 that are made of a metal material and generally have a U-shaped cross section. The outer forming jig 11 has a pair of opposed flat plate portions 11a and a connection portion 11b for connecting one end portions of the pair of flat plate portions 11a. In the outer forming jig 11, a space surrounded by the pair of flat plate portions 11 a and connection portions 11 b is a recess 11 c serving as an opening. A fiber sheet 12 used when manufacturing the composite material is disposed on the inner surface of the recess 11c. A plurality of the fiber sheets 12 are laminated and formed into a shape along the inner surface of the recess 11c.

Inside the recess 11 c of the outer molding jig 11, an inner molding jig 13 that sandwiches the fiber sheet 12 used when producing a composite material with the outer molding jig 11 is disposed. The inner molding jig 13 generally has a U-shaped cross section, and has a similar shape to the outer molding jig 11. The inner forming jig 13 has a pair of opposed flat plate portions 13a and a connection portion 13b for connecting one end portions of the pair of flat plate portions 13a. In the inner forming jig 13, a space surrounded by a pair of flat plate portions 13a and connecting portions 13b is a recess 13c serving as an opening.

Next, the method for manufacturing the composite material according to the present embodiment will be described in detail. 3A and 3B are explanatory diagrams of the method for manufacturing the composite material according to the present embodiment. As shown in FIG. 3A, in the forming step S11, the fiber sheets 12 are laminated along the outer peripheral surface of the inner forming jig 13 and formed into a desired shape. As the fiber sheet 12, for example, glass fiber and carbon fiber fabrics are used. Next, as shown in FIG. 3B, the outer forming jig 11 is placed on the fiber sheet 12, and the fiber sheet 12 is sandwiched between the outer forming jig 11 and the inner forming jig 13.

Next, in the curing step S 12, the fiber sheet 12 is gradually heated (for example, 200 ° C.) while applying vibration to the fiber sheet 12 by the vibration applying unit 14 through the outer forming jig 11, and the fiber sheet 12. Curing while molding. Here, the fiber sheet 12 is solidified while changing the position to which vibration is applied by the vibration applying means 14 using the time difference at which the laminated fiber sheets 12 are solidified. Thereby, as shown in FIGS. 3B and 4, the outer forming jig 11, the fiber sheet 12, and the inner forming jig 13 that were in close contact with each other at the start of heating were applied by the vibration applying unit 14. Since it solidifies while gradually shifting its position due to vibration, spaces A1 and A2 are formed between the outer forming jig 11 and the fiber sheet 12. As a result, the residual stress inside the plurality of fiber sheets 12 generated during the lamination of the fiber sheets 12 is relieved, so that it is possible to prevent deformation of the product due to springback based on the residual stress after heat curing described later. The position where vibration is applied by the vibration applying means 14 is not particularly limited as long as the effect of the present invention is achieved, and vibration may be applied to the pair of flat plate portions 13a, and vibration may be applied to the connection portion 13b. You may provide, and you may provide a vibration to the boundary part of a pair of flat plate part 13a and the connection part 13b. In addition, it is preferable to apply the vibration by the vibration applying unit 14 until the fiber sheet 12 is completely cured.

Then, after the fiber sheet 12 is completely solidified while applying vibration to the fiber sheet 12 by the vibration applying means 14, the molding jig 1 sandwiching the fiber sheet 12 is placed in a furnace such as an autoclave at 3 kg / cm ^2. It is heated and fired at a pressure of about 200 ° C. and a high temperature of about 200 ° C. Finally, in the product removal step S13, after the molding jig 1 after heating and baking is cooled to about room temperature, the outer molding jig 11 and the inner molding jig 13 are sequentially detached from the fiber sheet 12 and a plurality of fibers. A composite material in which the sheets 12 are laminated is manufactured.

There is no restriction | limiting in particular as temperature in hardening process S12 if it is a range with the effect of this invention. The temperature in the curing step S12 is, for example, 130 ° C. or higher and 200 ° C. or lower. Further, as the vibration applying means 14, various vibration applying means can be used as long as the effects of the present invention are achieved. As the vibration applying means 14, for example, various vibrators can be used, and among these, one capable of applying high-frequency vibration such as an ultrasonic vibrator can be used.

Thus, according to the present embodiment, the fiber sheet 12 is cured by heating while applying vibration to the fiber sheet 12 in which the plurality of fiber sheets 12 are laminated. It is possible to gradually solidify the composite material into a desired shape while relaxing the positional deviation. Thereby, since the fiber sheet 12 can be heated while relieving the residual stress generated inside the fiber sheet 12 at the time of molding, it is possible to realize a method for manufacturing a composite material that can reduce deformation of the product due to springback.

Further, according to the present embodiment, the composite material is molded using the molding jig 1 including the outer molding jig 11 and the inner molding jig 13 having a U-shaped cross section that is largely deformed by the springback. Even if it is a case, since the fiber sheet 12 can be shape | molded, relieving the residual stress which generate | occur | produced in the fiber sheet 12 at the time of shaping | molding, the deformation | transformation of the product by a springback can be reduced further. In addition, the shaping | molding jig | tool 1 can change and use a thickness suitably according to the composite material to be used and the shape to shape | mold. Further, as the forming jig 1, a tool that can be disassembled into a plurality of members may be used.

In the above embodiment, an example in which one vibration applying unit 14 is used has been described, but a plurality of vibration applying units 14 may be used in combination. By using the plurality of vibration applying means 14 in combination, the deformation of the product due to the spring back can be further reduced. Moreover, the vibration by the vibration applying means 14 may be applied locally to the fiber sheet 12 or may be applied to the entire fiber sheet 12.

In the composite material manufacturing method according to the above-described embodiment, the example in which the fiber sheet 12 is solidified while applying vibration to the outer forming jig 11 by the vibration applying unit 14 has been described. Is not necessarily applied to the outer forming jig 11.

5A to 5C are diagrams showing another example of the curing step S12 of the composite material manufacturing method according to the above embodiment. In the example illustrated in FIG. 5A, the vibration applying unit 14 applies vibration to the fiber sheet 12. By imparting vibration in this manner, the fiber sheet 12 is less likely to transmit vibration compared to the outer forming jig 11, and therefore the vibration is locally generated at a specific location where the spring back of the fiber sheet 12 is likely to occur. It becomes possible to apply, and the deformation of the product due to the spring back can be reduced more effectively. In addition, as a position at the time of applying a vibration to the fiber sheet 12 by the vibration applying unit 14, for example, in a state where the fiber sheet 12 is sandwiched between a pair of the outer forming jig 11 and the inner forming jig 13. 2, vibration may be applied directly to the fiber sheet 12 from the front side of the paper with respect to the forming jig 1 shown in FIG. 2, and vibration is directly applied to the fiber sheet 12 from the depth direction of the paper with respect to the forming jig 1 shown in FIG. May be applied. Alternatively, an opening may be provided in the outer molding jig 11 and the inner molding jig 13 to apply vibration.

In the example shown in FIG. 5B, vibration is simultaneously applied using two vibration applying means 14A and 14B. The vibration applying unit 14 A applies vibration to the fiber sheet 12, and the vibration applying unit 14 B applies vibration to the outer forming jig 11. Thus, by simultaneously applying vibration to a jig such as a metal and a composite material, vibration can be applied to a wide range of the fiber sheet 12, and the fiber sheet 12 can be locally vibrated. The back can be further reduced.

In the example shown in FIG. 5C, vibration is simultaneously applied using two vibration applying means 14A and 14B. The vibration applying units 14 A and 14 B apply vibrations to different locations of the fiber sheet 12. As described above, by simultaneously applying vibrations to different portions of the fiber sheet 12, it is possible to efficiently vibrate desired portions of the fiber sheet 12 locally.

FIG. 6 is a view showing another example of the forming jig according to the present embodiment. A forming jig 100 shown in FIG. 6 includes a pair of an outer forming jig 101 and an inner forming jig 103 that are made of a metal material and generally have an M-shaped cross section. The outer forming jig 101 includes a pair of opposing flat plate portions 101a and a pair of extending portions 101b that extend from one end of the pair of flat plate portions 101a to the flat plate portion 101a. Have. The tip ends of the pair of extending portions 101b are joined. In the outer forming jig 101, a space surrounded by the pair of flat plate portions 10 and the connection portion 101b is a recess 101c serving as an opening. A fiber sheet 102 used when producing a composite material is disposed on the inner surface of the recess 101c. A plurality of the fiber sheets 102 are laminated and formed into a shape along the inner surface of the recess 101c.

Inside the concave portion 101 c of the outer molding jig 101, an inner molding jig 103 that sandwiches the fiber sheet 102 used when manufacturing a composite material with the outer molding jig 101 is disposed. The inner molding jig 103 generally has a U-shaped cross section, and has a similar shape to the outer molding jig 101. The inner forming jig 103 includes a pair of opposed flat plate portions 103a and a pair of extending portions 103b that connect from one end of the pair of flat plate portions 103a so as to be folded back with respect to the flat plate portion 103a. Have. The tip ends of the pair of extending portions 103b are joined. In the inner molding jig 103, a space surrounded by the pair of flat plate portions 103a and the connection portion 103b is a recess 103c serving as an opening. Even in the forming jig 100 having a relatively complicated shape with respect to such a forming jig 1, as described in the forming jig 1, while applying vibration by the vibration applying means 14. By curing the fiber sheet 102, the composite material can be molded while relieving the residual stress generated in the composite material during molding, so that the deformation of the product due to the spring back can be further reduced.

7A and 7B are diagrams showing another example of the curing step S12. In the example shown in FIG. 7A, the fiber sheet 12 is vibrated while applying vibration to the fiber sheet 12 by the vibration applying means 14 in a state where the center portion of the connection portion 11b of the forming jig 1 is pressed by the pair of fixing jigs 30a and 30b. 12 is cured. As a result, a positional shift gradually occurs from the central portion 11c of the fiber sheet 12 toward both ends 12a and 12b from the central portion of the connecting portion 11b of the forming jig 1 fixed by pressing toward the flat plate portion 11a. In addition, it is possible to cause a positional shift substantially evenly from the central portion of the connecting portion 11b toward both end portions of the flat plate portion 11a. Thereby, for example, in the case of using not only the forming jig 1 having a U-shaped cross section shown in FIG. 7A but also a forming jig 2 having a complicated shape such as an M-shaped cross section as shown in FIG. Even if it exists, it becomes possible to reduce the deformation | transformation of the product by a springback more efficiently.

In the example shown in FIG. 7B, the vibration applying means 14 in a state where one end of the flat plate portion 11a of the forming jig 1 (or one end portion of each of the pair of flat plate portions 11a) is pressed by the pair of fixing

jigs

30a and 30b. The fiber sheet 12 is cured while applying vibration to the fiber sheet 12. Accordingly, the one end of the forming jig 1 fixed by pressing and / or the one end of each of the pair of flat plate portions 11a toward the central portion gradually from both

ends

12a, 12b of the fiber sheet 12 to the central portion 12c. Since the positional deviation occurs, it is possible to cause the positional deviation substantially evenly toward one end of the flat plate portion 11a and / or one end portion of each of the pair of flat plate portions 11a, thereby further reducing the deformation of the product due to the spring back. It can be further reduced. And since it becomes unnecessary to perform the processing (cutting process) of the composite material at one end of the flat plate portion 11a to which the forming jig 1 is fixed and / or one end portion of each of the pair of flat plate portions 11a, the working time is shortened. You can also The pair of fixing

jigs

30a and 30b is not particularly limited as long as the position of the fiber sheet 12 can be fixed via the outer forming jig 11 and the inner forming jig 13, for example, an actuator. Etc. can be used.

In the present embodiment, it is preferable that the vibrator applying means 14 is a vibrator that applies vibration to the composite material 12 at a predetermined frequency. Thereby, since a uniform and appropriate positional deviation occurs in each layer until the laminated composite material is cured, the difference in positional deviation between the respective layers can be reduced as compared with the case where vibration is applied intermittently and locally. Residual stress between the layers can be efficiently reduced.

Next, a method for manufacturing a composite material according to the second embodiment of the present invention will be described. In the following, differences from the above-described embodiment will be mainly described, and overlapping description will be avoided.

(Second Embodiment)
FIG. 8 is a flowchart of the method for manufacturing a composite material according to the second embodiment of the present invention. As shown in FIG. 8, the composite material manufacturing method according to the present embodiment includes a molding step S21 in which a composite material is placed on a molding jig, the composite materials are stacked and molded into a desired shape, and molding is performed. After the composite material arranged on the jig is covered with the film member, a vacuum suction step S22 in which the film member is vacuum-sucked, and a liquid resin such as an epoxy resin is sealed in the film member, and the liquid resin is placed between the composite materials. Liquid resin sealing step S23 to be impregnated, and curing step S24 for heating and curing the composite material disposed in the molding jig while vibrating the molding material and / or the composite material impregnated with the liquid resin. And a product removal step S25 for removing the product of the composite material after heat curing from the forming jig.

First, the vacuum impregnation apparatus 20 used in the method for manufacturing a composite material according to the present embodiment will be briefly described with reference to FIG. FIG. 9 is a schematic diagram of the vacuum impregnation apparatus 20 according to the present embodiment. In this vacuum impregnation apparatus 20, a composite material such as FEP is manufactured by a vacuum impregnation method (VaRTM method: Vacuum assisted Resin Transfer Molding). In this vacuum impregnation apparatus 20, a plurality of fiber sheets 23 are laminated via a plastic film 22 on a mold (molding jig) 21 made of a metal material. On the laminated fiber sheet 23, a mesh sheet 24 for preventing resin diffusion is disposed, and a bag film (film member) 25 is disposed so as to cover the fiber sheet 23 and the mesh sheet. Both end portions of the bag film 25 are sealed with a sealing member 26. In this vacuum impregnation apparatus 20, the inside of the bag film 25 can be vacuum-sucked, and the liquid resin is injected from the injection port 27 after vacuum suction.

Next, the method for manufacturing the composite material according to the present embodiment will be described in detail. In the molding step S21, the fiber sheet 23 and the plastic film 22 are alternately laminated on the molding die 21 and molded so as to have a desired shape. As the fiber sheet 23, for example, a woven fabric of glass fiber and carbon fiber is used. Next, in vacuum suction process S22, after covering the composite material arrange | positioned on the shaping | molding die 21 with the bag film 25, the inside of the bag film 25 is vacuum-sucked.

Next, as shown in FIG. 9, in the liquid resin sealing step S 23, the liquid resin is sealed inside the bag film 25 and the liquid resin is impregnated between the fiber sheet 23 and the plastic film 22. Here, in the present embodiment, the liquid resin is injected while applying vibration to the vacuum impregnation apparatus 20 by the vibration applying means 14 during vacuum suction. This makes it possible to reduce bubbles injected into the bag film 25 along with the liquid resin, thereby reducing the porosity inside the composite material formed by laminating the fiber sheets 23. The vibration by the vibration applying means 14 may be applied to the seal member 26 of the vacuum impregnation apparatus 20 or may be applied to the mold 21.

Next, as shown in FIG. 9, in the curing step S24, the fiber sheet 23 is gradually heated (for example, 130 ° C.) while applying vibration to the fiber sheet 23 laminated by the vibration applying means 14 through the bag film 25. The fiber sheet 23 is solidified while being formed. Here, the fiber sheet 23 is solidified while changing the position to which vibration is applied by the vibration applying means 14 using the time difference at which the laminated fiber sheets 23 are solidified. As a result, as in the composite material manufacturing method according to the first embodiment described above, the fiber sheet 23 impregnated with a plurality of laminated liquid resins is gradually displaced due to the vibration applied by the vibration applying means 14. Solidify while. As a result, the residual stress inside the fiber sheets 23 generated during the lamination of the fiber sheets 23 and the influence of pores accompanying the encapsulation of the liquid resin are alleviated. It becomes possible to prevent the deformation of.

In the curing step S24, vibration by the vibration applying means 14 may be applied to the fiber sheet 23 laminated via the bag film 25, or may be applied to the mold 21 (not shown). Moreover, the vibration by the vibration applying means 14 may be applied to the entire mold 21 and the fiber sheet 23 or locally. Moreover, the vibration by the vibration applying means 14 may be applied only to the mold 21, may be applied only to the fiber sheet 23, or may be applied to both the mold 21 and the fiber sheet 23. Further, as the curing conditions, the same conditions as in the curing step according to the first embodiment described above can be used.

Finally, in the product removal step S25, after the inside of the vacuum impregnation apparatus 20 is cooled to about room temperature, the bag film 25 and the plastic film 22 are sequentially removed from the fiber sheet 23 to produce a composite material in which a plurality of fiber sheets 23 are laminated. To do.

As described above, according to the method for manufacturing a composite material according to the present embodiment, the fiber sheet 23 can be gradually cured by heating while applying vibration to the fiber sheet 23 in which a plurality of layers are laminated. It is possible to solidify the composite material into a desired shape while mitigating the positional shift accompanying the molding of the fiber sheet 23, and to reduce the porosity inside the fiber sheet 23. Thereby, since the composite material can be molded while relaxing the residual stress generated in the fiber sheet 23 at the time of molding, a method for manufacturing the composite material that can reduce the deformation of the product due to the spring back can be realized.

1, 2 Molding jigs 11, 101

Outer molding jigs

11a, 101a

Flat plate portions

11b,

101b Connection portions

11c, 101c Recesses 12, 102

Fiber sheets

13, 103

Inner molding jigs

13a, 103a

Flat plate portions

13b,

103b Connection part

13c, 103c

Concave part

14, 14A, 14B Vibration application means 20 Vacuum impregnation apparatus 21 Mold (molding jig)
22 Plastic film (film member)
23 Fiber sheet 24 Mesh sheet 25 Bag film 26 Seal member 27 Inlet

Claims

A molding step of arranging a composite material on a molding jig, laminating the composite material, and molding the composite material into a desired shape;
A curing step of heating and curing the composite material disposed on the molding jig while applying vibration by vibration applying means to at least one of the molding jig and the molded composite material;
A product removal step of removing the product of the composite material after the heat curing from the molding jig.
The forming jig includes an outer forming jig having a pair of flat plate portions and a connecting portion connecting the pair of flat plate portions, and an inner forming having a pair of flat plate portions and a connecting portion connecting the pair of flat plate portions. The method for producing a composite material according to claim 1, further comprising a jig for heating the composite material by sandwiching the composite material between the inner molding jig and the outer molding jig.
The method for producing a composite material according to claim 1 or 2, wherein, in the curing step, the composite material is heated and cured in a state where a central portion of the molding jig is fixed.
The method for producing a composite material according to claim 1 or 2, wherein, in the curing step, the composite material is heated and cured in a state where one end and / or both ends of the forming jig are fixed.
A molding step of arranging a composite material on a molding jig, laminating the composite material, and molding the composite material into a desired shape;
A vacuum suction step of vacuuming the inside of the film member after covering the composite material arranged on the molding jig with a film member;
A liquid resin encapsulation step of encapsulating the liquid resin in the film member and impregnating the liquid resin between the composite materials;
A curing step of heating and curing the composite material disposed in the molding jig while applying vibration by vibration applying means to at least one of the molding jig and the composite material impregnated with the liquid resin;
A product removal step of removing the product of the composite material after the heat curing from the molding jig.
6. The composite material according to claim 1, wherein, in the curing step, the composite material is cured while applying vibration to at least one of the forming jig and the composite material after heat forming by a plurality of vibration applying means. A method for producing the composite material according to Item.
The method for manufacturing a composite material according to any one of claims 1 to 6, wherein the vibration applying means is a vibrator that applies vibration to the composite material at a predetermined frequency.
A composite material obtained by the method for producing a composite material according to any one of claims 1 to 7.