Method for manufacturing composite material joint

Abstract

To provide a method for manufacturing a composite material joined body which can hold adhesive force of joining a plurality of composite materials constituting a hollow part.SOLUTION: A method for manufacturing a composite material joined body includes the steps of: joining a plurality of composite materials in which fibers are impregnated with a resin, and forming a hollow body including at least a first cell and a second cell adjacent to the first cell inside; and adjusting a pressure so that a first pressure in the first cell becomes larger than a second pressure in the second cell, wherein in the step of forming the hollow body, the first cell includes an expansion member for pressurizing a first inner face facing the first cell of the first cell member surrounding the first cell, the second cell includes gas for pressurizing a second inner face facing the second cell of the second cell member surrounding the second cell, and in the step of adjusting the pressure, the first pressure for pressurizing the first inner face by the expansion member becomes larger than the second pressure for pressurizing the second inner face by the gas.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present disclosure relates to a method for manufacturing a composite joint body.

Background Art

[0002] Patent Document 1 describes an internal pressure forming method as a method for forming a composite joint body including a fiber-reinforced resin and having a hollow portion. In the internal pressure forming method of Patent Document 1, when joining a plurality of fiber-reinforced resin members with an adhesive, the inside of the cell is adhered by expanding a bladder bag inserted into the hollow cell. When applying the internal pressure forming method of Patent Document 1 to a propeller or the like divided into a plurality of cells, it is necessary to put the bladder bag into all the cells.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] When the cell includes an undercut shape or the like, it is impossible to use a bladder bag when adhering the inside of the cell. Therefore, it is difficult to apply the internal pressure forming method to the method for manufacturing a composite joint body.

[0005] An object of the present disclosure is to solve such problems, and to provide a method for manufacturing a composite joint body capable of maintaining the adhesive force of joining a plurality of composite materials constituting a hollow portion even when it is difficult to insert a bladder bag.

Means for Solving the Problems

[0006] A method for manufacturing a composite material joint according to an aspect of the present disclosure includes joining a plurality of composite materials impregnated with resin to form a hollow body having a plurality of cells including at least a first cell and a second cell adjacent to the first cell inside, and adjusting the pressure so that a first pressure in the first cell is greater than a second pressure in the second cell. In the step of forming the hollow body, the first cell includes an expansion member that contacts and pressurizes a first inner surface facing the first cell of a first cell member surrounding the first cell, and the second cell includes a gas that contacts and pressurizes a second inner surface facing the second cell of a second cell member surrounding the second cell. In the step of adjusting the pressure, the first pressure generated by the expansion member pressurizing the first inner surface is made greater than the second pressure generated by the gas pressurizing the second inner surface.

[0007] In the method for manufacturing the composite material joint, in the step of forming the hollow body, a part of the first cell member may have an overlapping portion where a plurality of the composite materials overlap in the thickness direction of the first cell member with an adhesive interposed therebetween.

[0008] In the method for manufacturing the composite material joined body, the step of forming the hollow body includes arranging a first skin including the composite material in a skin shape having a first surface and a first back surface on the opposite side of the first surface, and a first front end portion and a first rear end portion on the opposite side of the first front end portion, in a first mold such that the first surface faces the cavity side; arranging a second skin including the composite material in a skin shape having a second surface and a second back surface on the opposite side of the second surface, and a second front end portion and a second rear end portion on the opposite side of the second front end portion, in a second mold such that the second surface faces the cavity side; and combining the first mold and the second mold with the expansion member and the cylindrical spar sandwiched therebetween. In the step of combining the first mold and the second mold, the spar is arranged between the first back surface and the second back surface, and a part on the first front end portion side of the first back surface and a part on the second front end portion side of the second surface are overlapped with the adhesive sandwiched therebetween to form the overlapping portion. The adhesive is arranged between the first back surface and the spar, between the second back surface and the spar, and between a part on the first rear end portion side of the first back surface and a part on the second rear end portion side of the second back surface. The expansion member is arranged so as to be included in the first cell formed on the first front end portion side and the second front end portion side of the spar rather than the spar between the first back surface and the second back surface. The gas may be introduced into the second cell formed inside the spar.

[0009] In the method for manufacturing the composite material joined body, the expansion member may include at least one of a back that expands by introducing gas therein and a mandrel that expands by applying heat.

[0010] In the method for manufacturing the composite material joined body, the expansion member is a mandrel that expands by applying heat. In the step of adjusting the pressure, the temperature may be adjusted by temperature control pipes in the first mold and the second mold, and the first pressure may be made larger than the second pressure.

Advantages of the Invention

[0011] According to the present disclosure, it is possible to provide a method for manufacturing a composite material joined body that can retain the adhesive force of joining a plurality of composite materials constituting a hollow portion.

Brief Description of the Drawings

[0012]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Modes for Carrying Out the Invention

[0013] Hereinafter, the specific configuration of the present embodiment will be described with reference to the drawings. The following description shows preferred embodiments of the present disclosure, and the scope of the present disclosure is not limited to the following embodiments. Also, not all of the configurations described in the present embodiment are essential as means for solving the problems. For clarity of explanation, the following description and drawings are appropriately omitted and simplified. In each drawing, the same elements are denoted by the same reference numerals, and duplicate explanations are omitted as necessary.

[0014] (Embodiment 1) The manufacturing method of the composite material joint body of this embodiment combines a plurality of composite materials to manufacture a hollow body having a plurality of hollow parts inside. For example, for a method of manufacturing a hollow body having a plurality of hollow parts such as an airfoil cross-section, there are methods of bonding a plurality of composite materials with a jig or the like, and methods of integrally molding by solidifying a resin material with a mold. When joining a plurality of composite materials constituting the hollow part with an adhesive, an internal pressure molding method is used in which an expansion member such as a bladder bag is placed in the hollow part, and the members constituting the hollow part are joined by the pressure of the expansion member. However, when there is an undercut such that the inner diameter of the hollow part is larger than the inner diameter of the outlet, it is difficult to take out the expansion member placed in the hollow part. The manufacturing method of the composite material joint body of this embodiment manufactures a composite material joint body including such a hollow part having an undercut shape.

[0015] First, the composite material joint body of this embodiment will be described. FIG. 1 is a top view illustrating the composite material joint body according to Embodiment 1. FIG. 2 is a cross-sectional view illustrating the composite material joint body according to Embodiment 1, showing the cross-section along line II-II in FIG. 1. FIG. 3 is an exploded view illustrating the composite material joint body according to Embodiment 1.

[0016] As shown in FIGS. 1 to 3, the composite material joint body 1 includes a first skin 10, a second skin 20, a spar 30, and an adhesive 40. The composite material joint body 1 has, for example, a wing shape or a propeller shape. Here, for the convenience of explaining the composite material joint body 1, an XYZ orthogonal coordinate system is introduced. For example, the vertical direction is the Z-axis direction, the upward direction is the +Z-axis direction, and the downward direction is the -Z-axis direction. The direction extending from the root to the tip of the wing-shaped composite material joint body 1 is the Y-axis direction. The direction from the front end portion to the rear end portion is the X direction. Note that the XYZ orthogonal coordinate system and the upward and downward directions are introduced for the convenience of explaining the composite material joint body 1 and do not indicate the orientation when actually using the composite material joint body 1.

[0017] The first skin 10 is, for example, a member located above the composite material joint body 1. The first skin 10 is a feather-shaped member extending in the Y-axis direction. The first skin 10 includes a skin-like composite material.

[0018] The composite material is, for example, a general prepreg, in which the resin has impregnated the fibers. The fibers are configured as a woven fabric, knitted fabric, or braided fabric, such as carbon fibers, aramid fibers, nylon fibers, polyester fibers, or glass fibers, or any combination thereof. The resin includes a thermosetting resin, for example, an epoxy resin, a bismaleimide resin, a vinyl ester resin, an unsaturated polyester resin, a phenolic resin, or a silicone resin, etc.

[0019] The first skin 10 has a first front end portion 13 and a first rear end portion 14 opposite to the first front end portion 13. Further, the first skin 10 has a first root portion 15 and a first tip portion 16 opposite to the first root portion 15.

[0020] When viewed from the Y-axis direction, the cross-section of the first skin 10 is curved convexly upward. The first skin 10 has the first front end portion 13 on the +Z-axis direction side and the first rear end portion 14 on the -Z-axis direction side. The first skin 10 has the first front end portion 13 on the -X-axis direction side and the first rear end portion 14 on the +X-axis direction side. The first skin 10 has the first root portion 15 on the -Y-axis direction side and the first rear end portion 14 on the +X-axis direction side.

[0021] A part of the first skin 10 on the first front end portion 13 side may be thinner than other parts. For example, a part of the first skin 10 on the first front end portion 13 side of the first back surface 12 may be shaved to be thinner than other parts. For example, the part of the first skin 10 from the first connection portion 17 to the first front end portion 13 side is in a thin film shape. The part of the first skin 10 from the first connection portion 17 to the first front end portion 13 side is called the first thin film portion 18. The part of the first skin 10 from the first connection portion 17 to the first rear end portion 14 side is called the first main body portion 19. The first skin 10 has the first thin film portion 18 and the first main body portion 19.

[0022] The second skin 20 is, for example, a member located below the composite material joint 1. The second skin 20 is a feather-shaped member extending in the Y-axis direction. The second skin 20 includes a skin-like composite material.

[0023] The second skin 20 has a second front end portion 23 and a second rear end portion 24 on the opposite side of the second front end portion 23. Further, the second skin 20 has a second base portion 25 and a second tip portion 26 on the opposite side of the second base portion 25. The second skin 20 has a second front surface 21 and a second back surface 22 on the opposite side of the second front surface 21.

[0024] A part of the second skin 20 on the second front end portion 23 side may be thinner than other parts. For example, a part of the second skin 20 on the second front end portion 23 side of the second front surface 21 may be shaved to be thinner than other parts. For example, the portion of the second skin 20 from the second connection portion 27 to the second front end portion 23 side is in a thin film shape. The portion of the second skin 20 from the second connection portion 27 to the second front end portion 23 side is referred to as a second thin film portion 28. The portion of the second skin 20 from the second connection portion 27 to the second rear end portion 24 side is referred to as a second main body portion 29. The second skin 20 has the second thin film portion 28 and the second main body portion 29.

[0025] When viewed from the Y-axis direction, the second main body portion 29 is curved convex downward. The second main body portion 29 has the second front surface 21 on the -Z-axis direction side and the second back surface 22 on the +Z-axis direction side. The second main body portion 29 has the second rear end portion 24 on the +X-axis direction side and the second connection portion 27 on the -X-axis direction side. The second thin film portion 28 has the second front end portion 23 on the +X-axis direction side and the second connection portion 27 on the -X-axis direction side. That is, the second skin 20 may be curved so as to fold back with the second back surface 22 on the inside at the second connection portion 27. The second main body portion 29 and the second thin film portion 28 have the second base portion 25 on the -Y-axis direction side and the second tip portion 26 on the +Y-axis direction side.

[0026] The first thin film portion 18 and the second thin film portion 28 overlap with the adhesive 40 interposed therebetween. Specifically, the first thin film portion 18 and the second thin film portion 28 are overlapped so that the first front end portion 13 and the second connection portion 27 face each other, and the second front end portion 23 and the first connection portion 17 face each other. Therefore, a part of the first back surface 12 on the first front end portion 13 side and a part of the second front surface 21 on the second front end portion 23 side are overlapped with the adhesive 40 interposed therebetween to form an overlapping portion.

[0027] The spar 30 is disposed, for example, between the first back surface 12 of the first skin 10 and the second back surface 22 of the second skin 20. The spar 30 is a cylindrical member extending in the Y-axis direction. When viewed from the Y-axis direction, the cross-section of the spar 30 is rectangular. Thus, the spar 30 has an upper wall portion 31, a lower wall portion 32, a front wall portion 33, and a rear wall portion 34. The surface 35 on the +Z-axis direction side of the upper wall portion 31 of the spar 30 is joined to the first back surface 12 with an adhesive 40. The surface 36 on the -Z-axis direction side of the lower wall portion 32 of the spar 30 is joined to the second back surface 22 with the adhesive 40. The end portion of the spar 30 on the -Y-axis direction side protrudes further on the -Y-axis direction side than the first base portion 15 and the second base portion 25 on the -Y-axis direction side of the first skin 10 and the second skin 20. The end portion of the spar 30 on the -Y-axis direction side may be connected to the tubular sleeve 5. The end portion of the spar 30 on the +Y-axis direction side is located between the first skin 10 and the second skin 20. Thus, the end portion of the spar 30 on the +Y-axis direction side is disposed in an open state within the space surrounded by the first back surface 12 and the second back surface 22.

[0028] The adhesive 40 is, for example, a thin film-like adhesive. The adhesive 40 is disposed between the first thin film portion 18 and the second thin film portion 28, between the first back surface 12 and the spar 30, between the second back surface 22 and the spar 30, between a part of the first back surface 12 on the side of the first rear end portion 14, and a part of the second back surface 22 on the side of the second rear end portion 24.

[0029] The composite joint 1 has, for example, a first cell C1, a second cell C2, and a third cell C3. The first cell C1 is adjacent to the second cell C2. The second cell C2 is adjacent to the first cell C1 and the third cell C3. The third cell C3 is adjacent to the second cell C2.

[0030] The first cell C1 is formed on the first front end portion 13 side and the second front end portion 23 side rather than on the spar 30 between the first back surface 12 of the first skin 10 and the second back surface 22 of the second skin 20. The first cell member surrounding the first cell C1 has a first thin film portion 18, a second thin film portion 28, a portion on the -X axis direction side of the spar 30 of the first skin 10, a portion on the -X axis direction side of the spar 30 of the second skin 20, and a front wall portion 33 of the spar 30. Therefore, a part of the first cell member has an overlapping portion where a plurality of composite materials overlap in the thickness direction of the first cell member with the adhesive 40 interposed therebetween. The overlapping portion overlaps, for example, in the order of the second thin film portion 28, the adhesive 40, and the first thin film portion 18 toward the outside in the thickness direction of the first cell member. Note that the overlapping portion may overlap in the order of the first thin film portion 18, the adhesive 40, and the second thin film portion 28 toward the outside in the thickness direction of the first cell member.

[0031] The second cell C2 is formed inside the spar 30. That is, the second cell C2 includes a space surrounded by the spar 30. The second cell member surrounding the second cell C2 has an upper wall portion 31, a lower wall portion 32, a front wall portion 33, and a rear wall portion 34 of the spar 30.

[0032] The third cell C3 is formed on the first rear end portion 14 side and the second rear end portion 24 side rather than on the spar 30 between the first back surface 12 of the first skin 10 and the second back surface 22 of the second skin 20. The third cell member surrounding the third cell C3 has a portion on the +X axis direction side of the spar 30 of the first skin 10, a portion on the +X axis direction side of the spar 30 of the second skin 20, and a rear wall portion 34 of the spar 30.

[0033] Next, a method for manufacturing the composite material joined body of the present embodiment will be described. FIG. 4 is a flowchart illustrating a method for manufacturing the composite material joined body according to Embodiment 1. FIG. 5 is a cross-sectional view illustrating a hollow body according to Embodiment 1. As shown in FIGS. 4 and 5, the method for manufacturing the composite material joined body 1 of the present embodiment includes a step S10 of forming a hollow body having a plurality of cells including a first cell and a second cell, and a step S20 of adjusting the pressure so that the first pressure in the first cell is greater than the second pressure in the second cell.

[0034] In step S10 of forming the hollow body, a plurality of composite materials in which resin is impregnated with fibers are joined to form a hollow body having a plurality of cells including at least a first cell C1 and a second cell C2 adjacent to the first cell C1 inside. And the first cell C1 is configured to include an expansion member 70.

[0035] The expansion member 70 is, for example, a bag-shaped member such as a bladder bag, and is a bag that expands by introducing gas into the inside. Note that the expansion member 70 is not limited to a bladder bag, and may be a member that expands by applying heat such as a mandrel. The expansion member 70 may include at least one of a bladder bag and a mandrel. The expansion member 70 contacts the first inner surface facing the first cell C1 of the first cell member and pressurizes the first inner surface.

[0036] The first inner surface is a surface surrounding the first cell C1. Specifically, it includes a portion on the -X-axis direction side of the spar 30 on the first back surface 12 of the first skin 10, a portion on the -X-axis direction side of the spar 30 on the second back surface 22 of the second skin 20, and a surface 37 on the -X-axis direction side of the front wall portion 33 of the spar 30.

[0037] The second cell C2 is configured to include a gas that contacts the second inner surface facing the second cell C2 of the second cell member and pressurizes the second inner surface. The gas is, for example, air. The second inner surface is a surface surrounding the second cell C1. Specifically, it has a lower surface of the upper wall portion 31 of the spar 30, an upper surface of the lower wall portion 32, a surface on the +X-axis direction side of the front wall portion 33, and a surface on the -X-axis direction side of the rear wall portion 34.

[0038] The third cell C3 is configured to include a gas that contacts the third inner surface facing the third cell C3 of the third cell member and pressurizes the third inner surface. The third inner surface is a surface surrounding the third cell C3. Specifically, it includes a portion on the +X-axis direction side of the spar 30 on the first back surface 12 of the first skin 10, a portion on the +X-axis direction side of the spar 30 on the second back surface 22 of the second skin 20, and a surface 38 on the +X-axis direction side of the rear wall portion 34 of the spar 30.

[0039] In step S10 of forming the hollow body, a part of the first cell member is configured such that a plurality of composite materials overlap in the thickness direction of the first cell member with the adhesive 40 therebetween. Specifically, a part on the first front end portion 13 side of the first back surface 12 and a part on the second front end portion 23 side of the second surface 21 are overlapped with the adhesive 40 therebetween to form an overlapping portion.

[0040] FIG. 6 is a flowchart diagram illustrating the steps of forming the hollow body according to Embodiment 1. As shown in FIGS. 4 to 6, the steps of forming the hollow body include a step S11 of disposing the first skin 10 in the cavity 51 of the first mold 50, a step S12 of disposing the second skin 20 in the cavity 61 of the second mold 60, and a step S13 of combining the first mold 50 and the second mold 60 with the expansion member 70 and the spar 30 therebetween. Note that the order of step S11 and step S12 is not limited to this, and step S11 may be after step S12 or may be performed in parallel with step S12.

[0041] In the present embodiment, in the step of forming the hollow body, a mold structure including the first mold 50 and the second mold 60 is used. The first mold 50 has a cavity 51, a temperature control pipe 52, and a seal structure 53. The second mold 60 has a cavity 61, a temperature control pipe 62, and a seal structure 63. The mold structure can be opened and closed vertically. Also, the mold structure can adjust the temperature of the hollow body by the temperature control pipes 52 and 62. Note that in FIG. 5, some reference numerals are omitted so that the figure does not become complicated. Also, the hatching of the cross-sections of the first mold 50 and the second mold 60 is omitted.

[0042] In step S11, the first skin 10 including a skin-like composite material having a first surface 11 and a first back surface 12 on the opposite side of the first surface 11, and having a first front end portion 13 and a first rear end portion 14 on the opposite side of the first front end portion 13, is disposed in the first mold 50 such that the first surface 11 faces the cavity 51 side.

[0043] In step S12, a second skin 20 including a skin-like composite material having a second front end portion 23 and a second rear end portion 24 opposite to the second front end portion 23, and having a second front surface 21 and a second rear surface 22 opposite to the second front surface 21, is disposed in a second mold 60 such that the second front surface 21 faces the cavity 61 side.

[0044] Next, in step S13, the first mold 50 and the second mold 60 are closed with the expansion member 70 and the cylindrical spar 30 sandwiched therebetween. In step S13, the spar 30 is disposed between the first rear surface 12 of the first skin 10 and the second rear surface 22 of the second skin 20. Further, a first part on the first front end portion 13 side of the first rear surface 12 and a first part on the second front end portion 23 side of the second front surface 21 are overlapped with each other with the adhesive 40 sandwiched therebetween to form an overlapping portion. Furthermore, the adhesive 40 is disposed between the first rear surface 12 and the spar 30, between the second rear surface 22 and the spar 30, and between a first part on the first rear end portion 14 side of the first rear surface 12 and a first part on the second rear end portion 24 side of the second rear surface 22.

[0045] Then, the expansion member 70 is disposed so as to be included in a first cell C1 formed on the first front end portion 13 side and the second front end portion 23 side rather than the spar 30 between the first rear surface 12 and the second rear surface 22. Gas is introduced into a second cell C2 formed inside the spar 30 and a third cell C3 formed on the first rear end portion 14 side and the second rear end portion 24 side rather than the spar 30 between the first rear surface 12 and the second rear surface 22. In this way, a hollow body is formed.

[0046] Next, as shown in step S20, the pressure is adjusted so that the first pressure P1 in the first cell C1 is greater than the second pressure P2 in the second cell C2. Specifically, in step S20 of adjusting the pressure, the first pressure P1 generated by the expansion member 70 pressing the first inner surface is made greater than the second pressure P2 generated by the gas pressing the second inner surface. For example, when the expansion member 70 is a bladder bag, gas is introduced into the bladder bag so that the expansion member 70 presses the first inner surface with the first pressure P1. On the other hand, a sleeve 5 is attached to the -Y-axis direction side end of the spar 30, and gas is introduced into the second cell C2 inside the spar 30 through the sleeve 5. Thereby, the gas presses the second inner surface with the second pressure P2.

[0047] Also, the first pressure P1 generated by the expansion member 70 pressing the first inner surface is made greater than the third pressure P3 generated by the gas pressing the third inner surface. For example, the +Y-axis direction side end of the spar 30 is open between the first back surface 12 and the second back surface 22. In this way, the second cell C2 and the third cell C3 may be communicated. That is, the gas introduced into the spar 30 is introduced into the third cell C3 from the opening on the +Y-axis direction side of the spar 30.

[0048] When it is difficult to insert or remove the expansion member 70 into or from the second cell C2 and the third cell C3 due to an undercut shape or the like, the second inner surface of the second cell C2 and the third inner surface of the third cell C3 may be directly pressurized with gas. Therefore, the second pressure P2 and the third pressure P3 may be the same pressure. Thus, the pressure may be adjusted so as to satisfy the following equation (1).

[0049] P1>P2=P3 (1)

[0050] To bring the adhesion surfaces of the first thin film portion 18 and the second thin film portion 28 into close contact, an expansion member 70 for pressurization is inserted into the first cell C1. Thereby, a first pressure P1 is applied to the inside of the first cell C1. Also, to bring the adhesion surface between the spar 30 and the first skin 10 and the second skin 20 into close contact, a second pressure P2 is applied into the second cell C2. Further, to conform the shapes of the first skin 10 and the second skin to the cavity surface, pressure is applied to each cell.

[0051] When the first pressure P1 is less than or equal to the second pressure P2 (and the third pressure P3), the second pressure P2 (and the second pressure P3) is also applied to the adhesion surface between the first thin film portion 18 and the second thin film portion 28. This may have an adverse effect on the adhesion surface and may not achieve sufficient adhesion. Therefore, the first pressure P1 is set as the highest pressure. The second pressure and the third pressure are adjusted so that the position of the spar 30 does not shift in the +X-axis direction due to the first pressure P1.

[0052] Note that when the spar 30 is sandwiched between the first skin 10 and the second skin 20 and the first mold 50 and the second mold 60 are closed, if the spar 30 has sufficient rigidity so that no deformation such as surface indentation occurs other than the warpage deformation being corrected, the pressure in the second cell C2 may be atmospheric pressure without applying pressure. Also, to prevent the surface quality from deteriorating due to softening by heating of the first skin 10 and the second skin 20 that constitute the third cell member, a pressure P3 is applied into the third cell C3. When the first skin 10 and the second skin 20 have sufficient rigidity so that the surface quality does not deteriorate due to heating, the pressure in the third cell C3 may be atmospheric pressure without applying pressure. Further, when the positional accuracy of the spar 30 is not a problem, the pressure relationship of equation (1) is not necessarily required.

[0053] After step S20, the adhesive 40 is cured. For example, the adhesive 40 may be cured by heat treatment or the like. At this time, the composite material of the first skin 10 and the second skin 20 may also be cured. Then, by opening the first mold 50 and the second mold 60 and removing the expansion member 70, the composite material joined body 1 can be manufactured.

[0054] FIG. 7 is a cross-sectional view illustrating a hollow body according to another example of Embodiment 1. As shown in FIG. 7, the expansion member 70a may be a mandrel that expands by applying heat. In this case, in step S20, the temperature is adjusted by the temperature control pipe 52 in the first mold 50 and the temperature control pipe 62 in the second mold 60, and the first pressure P1 is made greater than the second pressure P2 and the third pressure P3.

[0055] Next, the effects of this embodiment will be described. In the method for manufacturing the composite material joint body 1 of this embodiment, the first cell C1 includes the expansion member 70, the second cell C2 and the third cell C3 contain gas, and the first pressure P1 in the first cell C1 is set to be greater than the second pressure P2 in the second cell C2 and the third pressure P3 in the third cell. The pressure is adjusted accordingly. Thereby, even when it is difficult to insert the expansion member 70 such as a bladder bag because the second cell C2 etc. include an undercut shape etc., the adhesive force between the first skin 10 and the second skin 20 and the spar 30 can be maintained. On the other hand, since the expansion member 70 can be inserted into the first cell C1, the adhesive force of the overlapping portion where the first thin film portion 18 and the second thin film portion 28 overlap can be maintained.

[0056] The expansion member 70 may be a bladder bag that expands by introducing gas therein, or a mandrel that expands by applying heat. In the case of a mandrel, by adjusting the temperatures of the first mold 50 and the second mold, the first pressure P1 in the first cell C1 can be made greater than the second pressure P2 in the second cell C2. Therefore, it can be incorporated into the heat treatment of the first skin 10 and the second skin 20, and the manufacturing process can be made more efficient.

[0057] (Embodiment 2) Next, a method for manufacturing the composite material joint 2 according to Embodiment 2 will be described. In this embodiment, the first cell C1, the second cell C2, and the third cell C3 are all cases where the expansion member 70 can be inserted and removed, and the expansion member 70 is inserted into the first cell C1, the second cell C2, and the third cell C3. FIG. 8 is a cross-sectional view illustrating a hollow body according to Embodiment 2. As shown in FIG. 8, in this embodiment, in step S13 of combining the first mold 50 and the second mold 60 with the expansion member 70 and the cylindrical spar 30 interposed therebetween, the expansion member 70 is inserted into the first cell C1, the second cell C2, and the third cell C3. The expansion member 70 may be a bladder or a mandrel. The relationship among the first pressure in the first cell C1, the second pressure in the second cell C2, and the third pressure in the third cell C3 is not limited to the above formula (1), and may be the same pressure as in the following formula (2). In this case, it is easy to ensure the accuracy of the position of the spar 30.

[0058] P1 = P2 = P3 (2)

[0059] According to this embodiment, the accuracy of the position of the spar 30 can be improved. Other configurations and effects are included in the description of Embodiment 1.

[0060] As described above, the embodiments of the present disclosure have been described. However, the present disclosure includes appropriate modifications that do not impair its purpose and advantages, and is not further limited by the above embodiments. Also, the components in Embodiment 1 may be combined as appropriate.

Description of Reference Numerals

[0061] 1, 2 Composite material joint 10 First skin 11 First surface 12 First back surface 13 First front end portion 14 First rear end portion 15 First root portion 16 First tip portion 17 First connection portion 18 First thin film portion 19 First main body portion 20 Second skin 21 Second surface 22 Second inner surface 23 Second front end portion 24 Second rear end portion 25 Second base portion 26 Second tip portion 27 Second connection portion 28 Second thin film portion 29 Second main body portion 30 Spar 31 Upper wall portion 32 Lower wall portion 33 Front wall portion 34 Rear wall portion 35, 36, 37, 38 Surfaces 40 Adhesive 50 First mold 51 Cavity 52 Temperature control pipe 53 Sealing structure 60 Second mold 61 Cavity 62 Temperature control pipe 63 Sealing structure 70, 70a Expansion member C1 First cell C2 Second cell C3 Third cell

Claims

1. A step of joining a plurality of composite materials in which a resin is impregnated into fibers to form a hollow body having a plurality of cells including at least a first cell and a second cell adjacent to the first cell inside; A step of adjusting the pressure so that a first pressure in the first cell is greater than a second pressure in the second cell; comprising In the step of forming the hollow body, the first cell includes an expansion member that contacts and pressurizes a first inner surface facing the first cell of a first cell member surrounding the first cell; the second cell contains a gas that contacts and pressurizes a second inner surface facing the second cell of a second cell member surrounding the second cell; In the step of adjusting the pressure, the first pressure generated by the expansion member pressurizing the first inner surface is made greater than the second pressure generated by the gas pressurizing the second inner surface; In the step of forming the hollow body, a part of the first cell member has an overlapping portion where a plurality of the composite materials overlap in the thickness direction of the first cell member with an adhesive interposed therebetween; The step of forming the hollow body is placing a first skin including the composite material in a skin shape having a first front end portion and a first rear end portion opposite to the first front end portion, on a first mold such that the first surface faces the cavity side; placing a second skin including the composite material in a skin shape having a second front end portion and a second rear end portion opposite to the second front end portion, on a second mold such that the second surface faces the cavity side; a step of combining the first mold and the second mold with the expansion member and a cylindrical spar interposed therebetween; having In the step of combining the first mold and the second mold, placing the spar between the first rear surface and the second rear surface; forming the overlapping portion by overlapping a part on the first front end portion side of the first rear surface and a part on the second front end portion side of the second surface with the adhesive interposed therebetween so as to face each other; placing the adhesive between the first rear surface and the spar, between the second rear surface and the spar, and between a part on the first rear end portion side of the first rear surface and a part on the second rear end portion side of the second rear surface; Arrange the expansion member so that it is included in the first cell formed on the first front end side and the second front end side rather than the spar between the first back surface and the second back surface. Introduce the gas into the second cell formed inside the spar. After the step of adjusting the pressure, cure the adhesive with the first pressure in the first cell being greater than the second pressure in the second cell. A method for manufacturing a composite material joined body.

2. The expansion member includes at least one of a bladder that expands by introducing gas therein and a mandrel that expands by applying heat. The method for manufacturing a composite material joined body according to claim 1.

3. The expansion member is a mandrel that expands by applying heat. In the step of adjusting the pressure, Adjust the temperature by temperature control piping in the first mold and the second mold, and make the first pressure greater than the second pressure. The method for manufacturing a composite material joined body according to claim 1.

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