JP2002254429A - Composite material and method for manufacturing it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a composite material which can be manufactured simpler and more inexpensively than before and in which a three-dimensional fiber structure with a high fiber volume density is used as a reinforcing material and a hole and a tapered part exist. SOLUTION: The composite material 1 is formed into a disc with a hole 1a at the center. The composite material 1 is constituted of an annular reinforcing material 2 with approximately the same outer shape as that of the composite material and a matrix phase 3. The reinforcing material 2 is formed of the three-dimensional fiber structure 7 using a carbon fiber and constituted with a volume content of at least 40% and the matrix phase 3 is constituted of a carbon prepared by calcining a resin. The three-dimensional fiber structure 7 is provided with a plurality of yarn layers formed by the first in-plane oriented yarns x and the second in-plane oriented yarns y extending in the direction intersecting at right angles each other and a plurality of yarn layers formed by bias yarns arranged so as to intersecting at approximately ±45 deg. to both in-plane oriented yarns x and y. In addition, each of the yarn layers is bound with a yarn z arranged in the direction intersecting at right angles to each of the yarn layers.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite material using a three-dimensional fiber structure as a reinforcing material (reinforcing substrate) and a method for producing the same.

[0002]

BACKGROUND OF THE INVENTION Fiber reinforced composites are widely used as lightweight structural materials. There is a three-dimensional woven fabric (three-dimensional fiber structure) as a reinforcing base material for a composite material. A composite material using the three-dimensional fabric as a reinforcing material and a resin or an inorganic material as a matrix is expected to be widely used as a structural material for rockets, aircraft, automobiles, ships, and buildings.

In order to use composite materials for a wide range of applications,
It is necessary to connect each member with a bolt or a pin similarly to a general metal structural material, and a hole (hole) for connection is required in the composite material. Conventionally, this kind of hole processing is generally performed in the state of a composite material in which a reinforcing material is impregnated with a resin.
Performed by drill. JP-A-2-229265 discloses a method of perforating a three-dimensional fabric as a reinforcing material of a composite material without cutting the fiber with a special drill before impregnating the resin with a three-dimensional fabric.

In some cases, a composite material having a rotating body shape such as a disk shape or a ring shape is required. In the case where the shape of the composite material is a rotating body, it is not possible to simply fabricate a laminate yarn group of biaxial orientation in the X and Y directions with a thickness direction yarn. When manufacturing a three-dimensional woven fabric F having a rotating body shape,
As shown in FIG. 6A, radially extending r-direction fibers 5
1, a θ-direction fiber layer comprising a ring-shaped θ-direction fiber 52, and a z-direction fiber 53 arranged orthogonally to each fiber layer and connecting each fiber layer.
Is required.

[0005] In addition, it is difficult and time-consuming to produce a large-sized and complex-shaped fiber-reinforced composite material using one three-dimensional fiber structure as a reinforcing material. Therefore, it is conceivable that a structural material having a simple shape of a two-dimensional structure or a three-dimensional fiber structure as a reinforcing material and a structural material having a three-dimensional fiber structure as a reinforcing material are bonded and used.

On the other hand, it is known that the shape of the joint portion of the fiber-reinforced composite material has a great effect on the stress concentration at the joint portion in the adhesive bonding of the fiber-reinforced composite material. ) 840-841, 845). Then, as shown in FIG. 7 (a), compared to a case where the plate members 55 having a certain thickness are joined to each other, as shown in FIG. 7 (b),
Stress concentration is less likely to occur when a plate member 55 having a constant thickness and a plate member 56 whose one end is formed obliquely (tapered) are joined. When the tapered portions of the plate material having one end inclined (tapered) are joined to each other, stress concentration is less likely to occur. When the plate members 55 having a certain thickness are joined to each other,
Increasing the lap length L of the bonding surface hardly contributes to the adhesive performance (load bearing capacity). However, when joining plate materials having one end inclined, increasing the wrap length L of the bonding surface increases the bonding capability. improves. Therefore, by using a structural material in which a three-dimensional fiber structure having one end formed in a tapered shape as a reinforcing material, the characteristics (strength, stress concentration, and the like) of the joint (joint) are excellent. Large structural materials can be obtained. Japanese Patent Application Laid-Open No. H11-241256 discloses a three-dimensional fiber structure having one end tapered and a method for manufacturing the same.

[0007]

In a composite material, particularly a composite material using ceramic fiber such as silicon carbide fiber or carbon fiber as a reinforcing material, wear of a tool when drilling or tapering in a composite material state. Is big. If the three-dimensional fabric (three-dimensional fiber structure) is not impregnated with the resin, the wear of the tool is reduced. However, when the fiber volume content of the three-dimensional fabric is low, if the holes are drilled or tapered while the resin is not impregnated, the fiber arrangement of the three-dimensional fabric is disturbed in the vicinity of the cut and removed fibers. Or fall off easily. As disclosed in Japanese Patent Application Laid-Open No. H11-241256, there is no problem if a three-dimensional fiber structure having one end tapered in advance, but it takes time and effort to manufacture.

[0008] If a method of performing perforation processing without cutting fibers as in the method disclosed in Japanese Patent Application Laid-Open No. 2-229265 is adopted, the fibers do not fall off after processing. However, in this method, at the time of drilling, the fibers existing in the vicinity of the drilled portion are pushed away by a tool and are arranged at high density around the hole. Therefore, there is no problem when the fiber volume content is low, but it is difficult to spread the holes when the fiber volume content is high. Further, even when a hole is formed, as shown in FIG. 6B, an expanded portion 58 is generated in the vicinity of a hole (hole) 57 formed in the three-dimensional fabric F, the fabric structure is disturbed, and the strength is reduced. Disadvantageously.

Further, a conventional three-dimensional woven fabric F having a rotating body shape is used.
Is composed of fibers arranged in the r-direction, the θ-direction, and the z-direction. Therefore, there is a problem that it is difficult to make the tissue and the fiber volume content uniform on the outer peripheral side and the inner side of the three-dimensional fabric F. . And, depending on the application, θ
There is no need for fibers extending along the direction (circumferential direction), and a fiber in which fibers are arranged with a uniform texture and density throughout is required.

The present invention has been made in view of the above-mentioned conventional problems, and a first object of the present invention is to provide a three-dimensional fiber structure which can be manufactured more easily and at lower cost and has a high fiber volume content. The present invention is to provide a rectangular parallelepiped, cubic, or flat composite material having a hole or a tapered portion, and a rotating composite material having a hole or a tapered portion. Further, a second object is to provide a manufacturing method thereof.

[0011]

According to the first aspect of the present invention, there is provided a three-dimensional fiber structure in which fibers are linearly arranged and the fiber volume content is 40% or more. A composite material having a body as a reinforcing material, having at least a hole or a tapered portion, and performing processing with a blade in a state before impregnating the three-dimensional fiber structure with a resin or the like for forming a matrix phase. Thereby, the hole or the tapered portion was formed.

In the present invention, since the reinforcing material of the composite material is constituted by the three-dimensional fiber structure having a fiber volume content of 40% or more, pores may be formed in the reinforcing material without being impregnated with the resin. Even when the outer shape processing such as the tapered portion is performed, the arrangement of the fibers of the three-dimensional fabric is not disturbed or dropped so as to deteriorate the physical properties of the composite material in the vicinity of the cut and removed fibers. Therefore, after processing the three-dimensional fiber structure into a shape corresponding to the shape of the composite material with a blade, a composite material can be manufactured by performing a post-process such as resin impregnation. In comparison, the wear of the cutting tool is reduced.

According to a second aspect of the present invention, in the first aspect of the present invention, the three-dimensional fibrous structures are arranged in a first and second in-plane arrangement folded at least in directions orthogonal to each other. A three-dimensional fiber structure including a plurality of yarn layers formed by yarns, and a thickness direction yarn arranged in a direction orthogonal to the yarn layers and connecting the yarn layers. In the present invention, a step of inserting a first weft orthogonal to a warp and a second weft orthogonal to a warp and a first weft between warp groups stretched in a plurality of rows and a plurality of columns is formed repeatedly. This makes it easier to form a three-dimensional fiber structure having a larger fiber volume content than the three-dimensional fabric to be manufactured.

According to a third aspect of the present invention, in the first or second aspect, the three-dimensional fiber structure is processed into a disc shape having a hole formed in the center. According to the present invention, there is provided a disk-shaped three-dimensional fiber structure including radially extending r-direction fibers, circumferentially extending θ-direction fibers, and z-direction fibers arranged to be orthogonal to each layer. In comparison, the structure and the fiber volume content of the three-dimensional fiber structure can be easily made uniform.

According to a fourth aspect of the present invention, in the first or second aspect, the three-dimensional fiber structure is processed so that at least one end thereof is tapered and thinned. According to the present invention, when the tapered portion is bonded to another member via an adhesive, stress concentration at the bonded portion is less likely to occur, and the bonding strength, that is, the load (load) that the bonded portion can withstand. Becomes larger.

According to a fifth aspect of the present invention, there is provided a method for producing a composite material using a three-dimensional fiber structure having a fiber volume content of 40% or more as a reinforcing material. By impregnating the three-dimensional fiber structure with a blade before impregnating the resin etc. for constituting the matrix phase,
After the outer shape of the three-dimensional fiber structure is formed into a shape conforming to the outer shape of the composite material or holes are formed, a post-process such as resin impregnation is performed.

According to the present invention, since the three-dimensional fiber structure serving as the reinforcing material is processed with the blade before impregnating the resin, the processing is facilitated as compared with the case where the processing is performed after the resin impregnation. Wear of the blade is reduced. Further, the production is simplified as compared with the case where a three-dimensional fiber structure corresponding to the shape of the composite material is formed without performing processing.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment in which the present invention is embodied in a carbon / carbon composite material (C / C composite material) will be described below with reference to FIGS. FIG. 1 is a schematic perspective view of a composite material, and FIGS. 3A and 3B are schematic diagrams showing an arrangement state of fibers when a three-dimensional fiber structure serving as a reinforcing material of the composite material is manufactured. .

As shown in FIG. 1, the composite material 1 has a hole 1 in the center.
It is formed in a rotating body shape having a (disc shape in this embodiment). The composite material 1 includes an annular reinforcing material 2 having substantially the same outer shape as the composite material, and a matrix phase 3. The reinforcing material 2 is formed of a three-dimensional fiber structure having a fiber volume content of 40% or more using carbon fibers, and the matrix phase 3 is formed of carbon obtained by firing a resin.

The three-dimensional fiber structure has a plurality of yarn layers 4 (shown only in FIG. 3A) formed by a first in-plane arrangement yarn x and a second in-plane arrangement yarn y extending in directions orthogonal to each other. )
And a plurality of yarn layers 5 formed by bias yarns B1 and B2 arranged so as to intersect with the yarns x and y arranged on both sides at an angle of approximately ± 45 ° (shown only in FIG. 3B). And The yarn layers 4 and 5 are connected by a thickness direction yarn z (shown only in FIG. 1) arranged in a direction orthogonal to the yarn layers 4 and 5.

Next, a method of manufacturing the composite material 1 having the above-described structure will be described. First, a method for manufacturing the reinforcing material 2 will be described. In order to form the annular reinforcing material 2, a rectangular plate-shaped three-dimensional fiber structure 7 is formed using a frame 6 as shown in FIG.
(Shown by chain lines in FIG. 1). Three-dimensional fiber structure 7
Is formed, first, the laminated yarn groups are arranged on the frame 6. The frame 6 is formed in a shape (square in this embodiment) corresponding to the outer shape of the laminated yarn group to be manufactured, and serves as a regulating member as a regulating member so as to surround a region 6a corresponding to the insertion region of the thickness direction yarn z. The pins 8 are removably arranged at a predetermined pitch.

Then, as shown in FIG. 3 (a), the first in-plane arranged yarns x are arranged along the frame of the frame body 6 so as to be engaged with the pins 8 at an orientation angle of 0 ° and folded back. Thus, the yarn layer 4 of the first in-plane arrangement yarn x is formed. The second in-plane arrangement yarn y is further arranged along the frame of the frame body 6 so that the second in-plane arrangement yarn y is engaged with the pin 8 at an orientation angle of 90 ° and folded back thereon. Layer 4 is formed. Also, as shown in FIG.
The bias yarns B1 and B2 are arranged so as to be folded back by engaging with the pins 8 at an orientation angle of ± 45 ° to form each yarn layer 5. After a predetermined number of the yarn layers 4 and 5 are formed on the frame 6, a thickness direction yarn insertion device proposed by the applicant of the present application (for example, Japanese Patent Application Laid-Open No. Hei 8-21824).
No. 9), the thickness direction thread z is inserted. A three-dimensional fiber structure having a fiber volume content of 40% or more by inserting a thickness direction yarn z from the front surface side of the laminated yarn group into the laminated yarn group and bonding the thickness direction yarn z on the back surface side with a retaining yarn (not shown) 7 is formed. Note that the thickness direction yarns z are arranged in the stacked yarn group with a predetermined tension. Therefore, even if the pins 8 are removed to finally form the three-dimensional fiber structure 7, it is possible to maintain the form as the three-dimensional fiber structure 7.

Each of the yarns x, y, z, B1, B2 is made of carbon fiber, and each carbon fiber is used in a roving (tow) state. Roving means a substantially non-twisted fiber bundle obtained by bundling a large number of single filament filaments. In each of the figures, the intervals between the yarns x, y, z, B1, and B2 are shown widely in order to make the arrangement of the yarns easy to understand. They are arranged close enough to contact each other.

Next, the three-dimensional fiber structure 7 formed in the shape of a square plate as described above is processed into an annular shape using a cutting tool.
The outside is cut off in an arc using a cutting device similar to a jigsaw. If the diameter of the hole 1a is small,
a is formed by rotating a cup-shaped blade. When the diameter of the hole 1a is large, a small hole is formed with a cup-shaped blade, and then the hole 1a is formed using a cutting device similar to a thread saw. When a C / C composite material is manufactured using the formed annular reinforcing material, the three-dimensional fiber structure is impregnated with a resin and then fired to carbonize the resin. It is preferable to use a phenol resin as the resin.

The annular C / C composite material 1 configured as described above is used, for example, as a brake disk. This embodiment has the following effects.

(1) As the reinforcing material 2 of the composite material 1, a three-dimensional fiber structure 7 in which fibers are linearly arranged and the fiber volume content is 40% or more is used. Before the resin 7 is impregnated into the resin 7, the reinforcing material 2 formed by processing the hole 1a and the outer shape with a blade is used. Therefore, as compared with the case where the processing is performed at the stage of the composite material 1, the wear of the blade is reduced. Further, since the fiber volume content is high, even if holes are formed or the outer shape processing is performed on the three-dimensional fiber structure 7 in a state where the resin is not impregnated, the physical properties of the composite material in the vicinity of the cut and removed fibers are reduced. The worse the is, the more the fiber arrangement of the three-dimensional fiber structure 7 is not disturbed or dropped, and the physical properties required for the composite material 1 are secured.

(2) The three-dimensional fiber structure 7 constituting the disk-shaped reinforcing material 2 is composed of yarns x, arranged on both sides as reinforcing fibers.
Due to y and the bias yarns B1 and B2, the in-plane four axes are pseudo-isotropic. Therefore, compared to a disk-shaped three-dimensional fiber structure composed of radially extending r-direction fibers, circumferentially extending θ-direction fibers, and z-direction fibers arranged to be orthogonal to each layer, The reinforcing material 2 is uniformly formed as a whole in both the structure and the fiber volume content, and the physical properties of the composite material 1 are improved.

(3) The three-dimensional fiber structure 7 has a structure in which a plurality of yarn layers 4 and 5 formed by yarns x and y arranged in both surfaces and bias yarns B1 and B2 are connected by a thickness direction yarn z. . Therefore, it is formed by repeating the step of inserting the first weft orthogonal to the warp and the second weft orthogonal to the warp and the first weft between the warp groups stretched in a plurality of rows and a plurality of columns. It is easy to form a three-dimensional fiber structure 7 having a larger fiber volume content than a three-dimensional fabric.

(4) Since the three-dimensional fiber structure 7 serving as the reinforcing material 2 is processed with a blade before impregnating the resin, the processing is facilitated as compared with the case where the processing is performed after the resin impregnation, and the processing is performed. The manufacturing is simplified as compared with the case where a three-dimensional fiber structure corresponding to the shape of the composite material 1 is formed without performing the above-described process.

(5) Since the carbon fibers constituting each of the yarns x, y, z, B1, B2 are used in a roving (tow) state, the fibers arranged at high density are brought into close contact with each other,
Even if processing is performed with a blade without impregnating the resin, disorder of the fiber arrangement is unlikely to occur near the cut and removed fibers.

(6) Since a phenol resin is used as a resin to be carbonized by firing, carbonization by firing is easier than when an epoxy resin or the like is used as the resin.

(7) Since at least one continuous yarn in the yarn layers is used as the yarns constituting the yarn layers 4 and 5, the yarns are arranged with an appropriate tension applied. This facilitates the improvement of the physical properties of the composite material 1.

(8) Since the hole 1a is formed not by a drill but by a cutting device similar to a cup-shaped blade or a thread saw, the fiber is less likely to be disturbed during processing.

The embodiment is not limited to the above, and may be embodied as follows, for example. ○ The shape of the composite material 1 is not limited to an annular shape.
As shown in (b), one end side may be formed in a tapered shape. When manufacturing this composite material, a square plate-shaped three-dimensional fiber structure 7 is manufactured in the same manner as in the above-described embodiment, and a reinforcing material is formed by processing with a blade so that one end side thereof is tapered and thinned. I do. Then, the reinforcing material is impregnated with a resin to obtain the composite material 1. When a C / C composite material is used, baking is performed after resin impregnation. As shown in FIG. 4 (b), when the composite material 1 is used by bonding the tapered portions 1b to each other with an adhesive, stress concentration hardly occurs.
A large-sized structural material having excellent characteristics (strength, difficulty of stress concentration, etc.) of a joint (joint) can be obtained.

In the case where the end of the plate-like member is processed into a tapered shape, the three-dimensional fiber structure 7 constituting the reinforcing material 2 is formed of a bias yarn B disposed on both the front and back surfaces thereof.
It is preferable to use a yarn layer 5 composed of 1, B2. In the case of the yarn layer 5 composed of the bias yarns B1 and B2, it is difficult for the yarn layer 5 to be frayed from the end portion. Is less likely to fray. Further, compared to the case where the yarn layer 4 is formed by the first in-plane arrangement yarn x or the second in-plane arrangement yarn y, the density of the yarns arranged on the surface layer becomes higher, and the surface of the composite material 1 has a higher density. The smoothness is improved.

As shown in FIG. 5, the plate-shaped composite material 1 may be provided with a hole 1c for connecting the composite material 1 to another member by means of bolts or pins. In this case, the hole 1c is formed by rotating a cup-shaped blade.

The arrangement of the thickness direction yarns z is not limited to the arrangement in which the yarn layers are fastened together with the retaining yarns. For example, a chain such as a fiber structure disclosed in JP-A-6-184906 is used. A configuration may be adopted in which the thread in the thickness direction z is perforated and tightened by a stitch method so that the thickness direction thread z itself performs a retaining function. Further, an arrangement method in which a step of inserting the thickness direction yarn z from the front side to the back side of the laminated yarn group and a step of inserting the thickness direction yarn z from the back side to the front side may be alternately repeated.

The insertion of the yarn in the thickness direction may be performed by a thickness direction yarn z and an FRP rod obtained by impregnating the fiber with a resin and curing the resin. In this case, each yarn x, y,
After arranging B1 and B2 so as to be folded back by the pins 8, a predetermined number of rods are inserted into the fiber arrangement portion with the thickness direction threads z roughly arranged. Then, when the pin 8 is removed, a three-dimensional fiber structure into which the rod is inserted is formed. Then, after processing into a predetermined shape with a blade, the resin is impregnated and hardened and used as an FRP or baked to be used as a C / C composite material.

The in-plane arrangement yarn x and the in-plane arrangement yarn y do not have to be arranged in directions orthogonal to each other. ○ The fiber volume content is preferably 50 to 60%.

As a jig used when a rod is used as the thickness direction thread z, the insertion of the rod is relatively soft, such as foamed resin, without forming a hole inside the frame 6 supporting the pin 8. It is also possible to provide a fiber array portion made of a material capable of performing the above-mentioned steps, and to directly insert a rod into the fiber array portion.

When a composite material is produced by impregnating the three-dimensional fiber structure 7 with a resin without providing a firing step, it is preferable to use the same resin as the matrix resin of the composite material 1 for the rod. . When the same resin is used, the physical properties of the composite material are improved. The resin is not limited to the phenol resin, but may be another thermosetting resin such as an epoxy resin, or a thermoplastic resin without being limited to the thermosetting resin.

The orientation angle of the bias yarns B1 and B2 is ± 4
The angle is not limited to 5 ° and may be another angle. However, ± 4
The arrangement at an orientation angle of 5 ° functions most effectively with respect to a diagonal force.

The three-dimensional fiber structure 7 is not limited to a configuration having four axes in a plane, that is, a total of five axes. Is also good. The fibers constituting the three-dimensional fiber structure 7 may be fibers other than carbon fibers. When heat resistance is required for the composite material 1, ceramic fibers such as silicon carbide fibers are used for the fibers. When used as the composite material 1 that does not require much heat resistance, a high-strength, high-elastic fiber such as aramid fiber may be used as a constituent fiber of the three-dimensional fiber structure 7.

The shape of the composite material 1 is not limited to an annular shape or a square plate shape, but a rotating body shape such as a disk shape, a column shape, a truncated cone shape, and the like.
The shape may be a polygon such as a triangle or a pentagon. ○ A metal may be used as the matrix phase 3.

The technical ideas (inventions) that can be grasped from the above embodiments are described below. (1) In the invention according to any one of claims 1 to 4, the three-dimensional fiber structure is formed by first and second in-plane arranged yarns arranged in a folded shape in directions orthogonal to each other. A plurality of yarn layers formed, a plurality of yarn layers formed by bias yarns arranged in a direction intersecting with the inner yarns on both surfaces, and the respective yarns arranged in a direction orthogonal to the respective yarn layers A thickness direction thread for joining the layers.

(2) In the invention according to any one of claims 1 to 5, the three-dimensional fiber structure is formed by roving carbon fibers. (3) In the invention according to claim 3, the composite material is a carbon-carbon composite material in which both the reinforcing material and the matrix are made of carbon.

(4) In the invention according to claim 4,
The three-dimensional fiber structure has a pair of bias yarn layers arranged on the front side and the back side, respectively.

[0048]

As described in detail above, claims 1 to 5 are provided.
According to the invention described in (3), a three-dimensional fiber structure having a high fiber volume content is used as a reinforcing material, and a rectangular parallelepiped, cubic or flat composite material having holes or tapered portions, and a rotating composite material are conventionally used. It can be manufactured more easily and at lower cost.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view of a composite material according to one embodiment.

FIG. 2 is a schematic plan view of a jig used to form a laminated yarn group.

FIG. 3A is a schematic view showing an arrangement state of in-plane arrangement yarns, and FIG. 3B is a schematic view showing an arrangement state of bias yarns.

FIG. 4A is a schematic perspective view of a composite material according to another embodiment, and FIG. 4B is a schematic side view showing a joined state of the composite material.

FIG. 5 is a schematic perspective view of a composite material according to another embodiment.

FIG. 6A is a schematic perspective view of a conventional three-dimensional woven fabric having a rotating body shape, and FIG. 6B is a schematic perspective view of a three-dimensional woven fabric in which holes are formed.

FIG. 7 is a schematic side view showing a joined state of two composite materials.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Composite material, 1a, 1c ... Hole, 1b ... Taper part, 2 ...
Reinforcing material, 3 matrix phase, 4,5 yarn layer, 7 three-dimensional fiber structure, x first in-plane arrangement yarn, y second in-plane arrangement yarn, z thickness direction yarn, B1, B2 ... Bias thread.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) // B29K 105: 08 B29C 67/14 X (72) Inventor Ryuta Kamiya 2-1-1 Toyota-cho, Kariya-shi, Aichi Prefecture Address F-term in Toyota Industries Corporation (Reference) 4F072 AA04 AA07 AB10 AB27 AC01 AD13 AH21 AL16 4F205 AD16 AD24 AD25 AD27 AG22 AG23 AG28 HA06 HA25 HA33 HA37 HA47 HB01 HC07 HF05 HG06 HL16 HL17 HL18 4L04A05A05A05

Claims (5)

[Claims] 1. A composite material in which fibers are linearly arranged and a three-dimensional fiber structure having a fiber volume content of 40% or more as a reinforcing material, the composite material having at least a hole or a tapered portion, A composite material in which the holes or the tapered portions are formed by performing processing with a cutting tool in a state before impregnating the original fiber structure with a resin or the like for forming a matrix phase. 2. The three-dimensional fiber structure according to claim 1, wherein the three-dimensional fiber structure includes a plurality of yarn layers formed by first and second in-plane yarns arranged in a folded shape at least in a direction orthogonal to each other; 2. The composite material according to claim 1, wherein the composite material is a three-dimensional fiber structure including: a thickness direction yarn that is arranged in a direction orthogonal to each other and connects the yarn layers. 3. 3. The composite material according to claim 1, wherein the three-dimensional fiber structure is processed into a disk shape having a hole formed in the center. 4. The composite material according to claim 1, wherein at least one end of the three-dimensional fiber structure is processed so as to be tapered. 5. A method for producing a composite material using a three-dimensional fiber structure having a fiber volume content of 40% or more as a reinforcing material, wherein a resin or the like for forming a matrix phase in the three-dimensional fiber structure is provided. By processing with a blade before impregnating,
A method for producing a composite material, in which the outer shape of the three-dimensional fiber structure is formed into a shape conforming to the outer shape of the composite material or holes are formed, and then a post-process such as resin impregnation is performed.