JP3475609B2 - Three-dimensional fiber structure and method of manufacturing the same - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a three-dimensional fiber structure and a method for manufacturing the same, and more particularly to a three-dimensional fiber structure in which a plurality of plate-like parts are formed in a continuous shape in a bent state at a connecting part and the same. The present invention relates to a manufacturing method.

[0002]

Fiber reinforced composites are widely used as lightweight structural materials. There is a three-dimensional woven fabric (three-dimensional fiber structure, fiber structure) as a reinforcing base material for a composite material. A composite material in which a resin or an inorganic material is used as a matrix with the three-dimensional woven fabric as a skeleton material is expected to be widely used as a structural material for rockets, aircrafts, automobiles, ships and buildings.
Generally, a three-dimensional woven fabric is composed of three types of yarns extending in the X, Y, and Z axis directions that are orthogonal to each other. In addition to three types of yarns extending in the X, Y, and Z axis directions, bias yarns arranged in a direction inclined with respect to the longitudinal direction of the three-dimensional fabric 5
Axial three-dimensional fabrics have also been proposed.

In order to make a three-dimensional woven fabric usable as a skeleton material for the composite material in a wide range of applications, the cross-sectional shape other than a quadrangle, such as an L-shape or a U-shape, can be used according to the application.
A three-dimensional fabric having an irregular cross section such as a V shape is required. As a three-dimensional woven fabric of this type of irregular cross section, JP-A-4-289241 is known.
Japanese Unexamined Patent Publication No. 6-184906 and Japanese Unexamined Patent Publication No. 6-184906 disclose a three-dimensional woven fabric in which a plurality of plate-shaped portions are formed in a continuous shape in a bent state at a connection portion. This three-dimensional woven fabric has, as its constituent elements, a continuous yarn that straddles both plate-shaped portions in order to increase the strength of the connecting portion of the adjacent plate-shaped portions.

Further, Japanese Patent Laid-Open No. 6-184906 discloses a number of methods for producing a fiber structure in which the ends of two or more plate-like parts (plate parts) are adjacent to each other at an angle. A method of using a frame body in which guide pins are erected is disclosed. For example, when a fiber structure having an L-shaped cross section is manufactured by this method, as shown in FIG. 21, an L-shaped frame body 62 in which a large number of guide pins 61 are planted so as to be able to be extracted at a predetermined pitch is used. used. The yarns are arranged so as to be hooked on the guide pins 61 and folded back, and a predetermined number of yarn layers having different yarn arrangement directions are laminated to form a laminated yarn group 63. Next, as shown in FIG. 22 (a), a large number of press plates 64 having a width slightly narrower than the spacing between the guide pins 61 are arranged on both front and back surfaces of the laminated yarn group 63, and they are pressed by a pressing device. While maintaining this compressed state, the press plates 64 are removed as one set of two front and back plates at one place, and as shown in FIG. 22 (b), a zera thread (thickness direction thread) 66 is used by using a spatula needle 65. Is joined by caulking the laminated thread group 63 by a chain stitch method. The perforation needle 68 is integrally fixed to the support member 67 to which the spatula needle 65 is attached, and the perforation needle 68 makes a hole at a position where the spatula needle 65 is inserted prior to the insertion of the spatula needle 65.

After caulking and joining the yarn array surface, the guide pin 61 is pulled out from the frame 62, and the frame 62 is removed from the fiber structure.
Remove. After that, since the frame body 62 hit the frame body 62 until then, the frame body 62 was an obstacle and the spatula needle 65 could not be inserted. Through the chain stitch method, caulking is performed.

[0006]

In the conventional three-dimensional fabric, the z yarn (thickness direction yarn) is inserted in the direction orthogonal to the laminated yarn group. Therefore, when manufacturing a three-dimensional woven fabric having a small radius of curvature inside the connecting portion (bending portion),
As shown in 0 (a), the z thread 66 is concentrated in the inner corner portion of the three-dimensional fabric 69, which causes a problem that the physical properties are deteriorated. In addition, when the z thread 66 is inserted, it is necessary to change the array angle one by one and the z thread 66 is inserted, which causes a problem that the insertion work takes time and the manufacturing apparatus becomes complicated.

The z-thread 66 is provided at the inner corner of the three-dimensional fabric 69.
In order to avoid the concentration of the z thread, as shown in FIG. 20B, the insertion of the z thread into the bent portion may be omitted, or only one z thread 66 may be inserted as shown by the chain line. But,
In this case, there is a problem that desired physical properties cannot be obtained.

In the method disclosed in Japanese Unexamined Patent Publication No. 6-184906, the z-thread 66 is inserted into the bent portion, and after the z-thread 66 is inserted into the laminated thread group 63, the three-dimensional fabric is formed into the frame 62. With one removed, do one by one. Therefore, there is a problem that it is difficult to press and hold the bent portion in a desired shape when the z-thread 66 is inserted into the bent portion, and it is difficult to hold the bent portion of the three-dimensional fabric in a shape having a small radius of curvature.

The present invention has been made in view of the above problems, and an object thereof is a connecting portion of a three-dimensional fiber structure in which a plurality of plate-like portions are formed in a continuous shape in a bent state at the connecting portion. It is an object of the present invention to provide a three-dimensional fiber structure and a method for manufacturing the three-dimensional fiber structure, which can enhance the physical properties of the three-dimensional fiber structure and can simplify the work of inserting the yarn for connecting the yarn layers at the connection portion.

[0010]

In order to achieve the above-mentioned object, in the invention according to claim 1, a plurality of plate-like portions are formed in the connecting portion in a continuous shape in a bent state, and
Each plate-shaped portion is composed of at least three axes including a laminated yarn group formed by laminating a plurality of yarn layers and having at least biaxial orientation, and thickness direction yarns arranged in the thickness direction, and adjacent to each other. It has a thread that extends in a direction intersecting the connecting portion of the plate-shaped portions and is arranged along a plane orthogonal to the thickness direction of each plate-shaped portion and that is continuous across both plate-shaped portions as its constituent elements. The plurality of corner yarns arranged so as to intersect the yarn layer at the connecting portion are arranged in parallel with each other.

According to a second aspect of the present invention, the plurality of corner yarns are arranged in parallel and symmetrically with a plane that divides an angle formed by adjacent plate-shaped portions into two equal parts or approximately two equal parts. . According to a third aspect of the present invention, in the first aspect of the present invention, the plurality of corner yarn layers are orthogonal to a plane that divides an angle formed by adjacent plate-shaped portions into two equal or almost equal two portions. Are arranged as follows.

In the invention according to claim 4, the plurality of plate-shaped portions are formed in a shape corresponding to the shape of the three-dimensional fiber structure which is continuous in a bent state at the connection portion, and the regulating members are arranged at a predetermined pitch. On the arranged frame body, a plurality of yarn layers in which the yarns are arranged in a folded manner are laminated between the regulating members to form a laminated yarn group having at least biaxial orientation, and then the laminated yarn group is held in the frame body. In the state, the thickness direction yarns are inserted into the plate-shaped portion other than the portion corresponding to the corner portion of the three-dimensional fiber structure so as to be orthogonal to the plurality of yarn layers forming each plate-shaped portion, and the yarn for the corner portion is formed. To insert, insert a plurality of corner part thread insertion needles arranged in one row together with the corner part thread into the laminated thread group, and pierce until the corner thread holding part comes out of the laminated thread group. Form a loop of corner thread on the protruding side of the thread insertion needle. And a step of inserting a retaining thread into the loop along the direction in which the corner portion thread insertion needle is arranged, and at least after the retaining thread is inserted into the loop, at least the insertion side of the corner portion thread insertion needle In the state where the pressing member corresponding to the shape of the corner portion is arranged and the laminated yarn group is pressed, the step of pulling back and tightening the yarn for the corner portion is repeated to insert the yarn for the corner portion into the predetermined insertion area, and thereafter. The laminated yarn group was removed from the frame.

In the invention according to claim 5, in the invention according to claim 4, in the step of pulling back and tightening the yarn for the corner portion after the retaining thread is inserted into the loop, the laminated yarn group The pressing member corresponding to the shape is used to press from both sides.

According to the first to third aspects of the invention, the connecting portion has a continuous thread that straddles a plurality of plate-shaped portions formed in a continuous shape in a bent state as its constituent elements. . Therefore, when a load is applied to a plate-shaped portion having a composite material in which the three-dimensional fiber structure is a skeletal material, the presence of threads arranged across the plate-shaped portion and other plate-shaped portions causes The yarn effectively contributes to the stress acting on the connecting portion of both plate-like portions, and the strength of the composite material is improved. Further, since a plurality of yarns for corner portions are arranged in the connecting portion in parallel with each other and intersect with the yarn layers constituting the respective plate-like portions, the physical properties of the connecting portion ( Strength) becomes higher. Further, since the plurality of corner yarns are arranged in parallel with each other, it becomes easy to simultaneously insert the plurality of corner yarns when manufacturing the three-dimensional fiber structure.

According to a second aspect of the present invention, the plurality of corner yarns are arranged in parallel and symmetrically with a plane that divides an angle formed by adjacent plate-shaped portions into two equal parts or approximately two equal parts. Therefore, the physical properties of the connection portion when the composite material is formed become uniform. Further, the number of corner portion yarns at the connecting portion can be increased without inserting the corner portion yarns into the region of the plate portion into which the thickness direction yarns are inserted.

According to a third aspect of the invention, the plurality of corner yarns are arranged so as to be orthogonal to a plane that divides an angle formed by adjacent plate-like portions into two equal parts or approximately two equal parts. Therefore, when the composite material is used, the resistance to the force in the direction in which the angle formed by the adjacent plate-shaped portions changes increases.

In a fourth aspect of the invention, the yarn is folded back between the regulating members on a frame body formed in a shape corresponding to the shape of the three-dimensional fiber structure and in which the regulating members are arranged at a predetermined pitch. A plurality of yarn layers arranged in a line are laminated to form a laminated yarn group having at least biaxial orientation. In the state where the laminated yarn group is held on the frame, the thickness direction yarns are orthogonal to the plurality of yarn layers forming each plate-shaped portion on the plate-shaped portion other than the portion corresponding to the corner portion of the three-dimensional fiber structure. Is inserted to do.
When the yarn for the corner portion is inserted into the corner portion, a plurality of yarn insertion needles for the corner portion arranged in one row are simultaneously inserted into the laminated yarn group together with the yarn for the corner portion. The corner portion thread insertion needle is pierced into the laminated yarn group until the corner portion yarn holding portion comes out of the laminated yarn group, and a loop of the corner portion yarn is formed on the protruding side of the corner portion yarn insertion needle. Next, the retaining thread is inserted into the loop along the arrangement direction of the corner thread inserting needle, and after the retaining thread is inserted into the loop, the corner thread inserting needle retracts from the laminated yarn group. Then, in a state in which a pressing member corresponding to the shape of the corner portion is arranged at least on the insertion side of the yarn inserting needle for the corner portion and the laminated yarn group is pressed, the yarn for the corner portion is pulled back to make the laminated yarn group for the corner portion yarn. It is tightened by. The operation of inserting the yarn for the corner portion is repeated to insert the yarn for the corner portion into the predetermined insertion area. The thickness direction thread and the corner portion thread may be inserted first. After the insertion of the thickness direction yarn and the corner yarn is completed, the laminated yarn group is removed from the frame body.

In the invention according to claim 5, in the step of pulling back the yarn for the corner portion and tightening the laminated yarn group with the yarn for the corner portion after the retaining thread is inserted into the loop, the laminated yarn group is formed at the corner portion. It is pressed from both sides by a pressing member corresponding to the shape. Therefore, even if the corner portion has a large curvature, that is, even if the corner portion has a small curvature radius, the yarn for the corner portion is inserted while being held in a desired shape.

[0019]

DETAILED DESCRIPTION OF THE INVENTION

(First Embodiment) A first embodiment of the present invention will be described below with reference to FIGS.

As shown in FIG. 1, the three-dimensional fiber structure F has a corner portion as a connecting portion such that the two plate-like portions 1a and 1b form a predetermined angle (90 ° in this embodiment). Two
Is formed into a substantially L-shaped cross section by being connected in a bent state. Both plate-like portions 1a and 1b are composed of an x-yarn layer, a y-yarn layer and a bias yarn layer, which are arranged in parallel with each other, and a thickness direction yarn z and a corner portion yarn c which connect the respective yarn layers. .

The x-yarn layer is a first in-plane array yarn arrayed in the direction along the corner portion 2 of both plate-like portions 1a and 1b in the plane orthogonal to the thickness direction of the three-dimensional fiber structure F. x, which is formed by arranging one thread in a folded shape as shown in FIG. The y-yarn layer is composed of a second in-plane array yarn y arranged in a direction orthogonal to the first in-plane array yarn x in a plane parallel to the x-yarn layer, and as shown in FIG. It is formed by arranging one thread so as to be folded back at each tip of both plate-shaped portions 1a and 1b. The bias yarn layer has a predetermined angle (45 in this embodiment) with respect to the yarns x and y arranged in the both surfaces in a plane parallel to the x yarn layer.
Bias yarns B are arranged so as to be inclined at an angle of 0 °). As shown in FIGS. 3 (c) and 3 (d), the bias yarns B are formed on both plate-shaped portions 1a and 1b while intersecting the corner portions 2. It is arranged so as to straddle and continue.

The thickness direction yarns z are arranged in the thickness direction of the three-dimensional fiber structure F so as to connect the layers in a state where the yarns z are orthogonal to the yarn layers in the portions other than the corner portions 2. A plurality of corner portion yarns c are arranged in parallel with a plane that divides an angle formed by two adjacent plate-shaped portions 1a and 1b into two equal parts. The arrangement pitch of the corner yarns c is arranged at a pitch substantially equal to the arrangement pitch of the thickness direction yarns z. That is, the three-dimensional fiber structure F is a five-axis oriented three-dimensional fiber structure in which the in-plane four-axis oriented fiber structure is connected by the thickness direction yarn z and the corner portion yarn c.

The three-dimensional fiber structure F constructed as described above is mainly impregnated with resin and used as a composite material. When a load in the direction of arrow W in FIG. 1 acts on the composite material, a large stress acts on the corner portion 2 of the three-dimensional fiber structure F. The second in-plane array yarn y and the bias yarn B are both plate-shaped portions 1
Since it extends in the direction intersecting the corner portion 2 of a and 1b and is arranged so as to straddle both plate-like portions 1a and 1b,
The yarns (fibers) effectively contribute to share the force in the direction of withstanding the stress acting on the corner portion 2, and the strength of the composite material is improved.

Next, a method for manufacturing the above-mentioned three-dimensional fiber structure F will be described. First, the frame 3 used when manufacturing the three-dimensional fiber structure F will be described. As shown in FIG. 4, the frame 3 is formed in a shape corresponding to the shape of the three-dimensional fiber structure (L-shaped in this embodiment). The frame 3 has a main body 3a formed so as to surround a region 4 corresponding to an insertion area of the thickness direction thread z, and a large number of pins as detachable erected standing members outside the main body 3a at a predetermined pitch. 5 and a support bar 7 as a support member which is detachably fixed to the corner portion of the frame body 3 with a screw 6. As shown in FIG. 5, a groove 7a having a width slightly larger than the diameter of the pin 5 is formed along the longitudinal direction at a corner portion of the support bar 7 so as to be located on a diagonal line, and the groove 7a has a predetermined pitch at a bottom portion thereof. The pin 5 is detachably fitted into the formed hole.

Next, an inserting device for inserting the thickness direction yarn z and the corner portion yarn c will be described. FIG. 6 is a schematic perspective view showing the insertion state of the thickness direction thread z, and FIG. 7 is a schematic partial plane view of the insertion device 8. As shown in FIG. 7, the insertion device 8 supports the frame body 3 in which the laminated yarn group 9 is arranged between the pair of support brackets 11 (only one side is shown) via the attachment member 10, and the thickness direction yarn z or the corners are supported. The part yarns c are simultaneously inserted row by row. As shown in FIG. 8, the mounting member 10 has a substantially triangular side surface, is fixed to the frame 3 with bolts 12, and a plurality of (three in this embodiment) screw holes 10a are formed on the side surface. Has been done. A plurality of bolt insertion holes (not shown) are formed in the support piece 13 of the support bracket 11, and the frame is formed by the bolts 14 (illustrated in FIG. 7) that penetrate the bolt insertion holes and are screwed into the screw holes 10a. It is adapted to support the body 3 in a desired orientation.

As shown in FIG. 7, the substrate 15 of the insertion device 8
A support table 16 is provided on the front side (lower side in FIG. 7) so as to be movable in the left-right direction in FIG. 7, and a support bracket 11 is erected on the support table 16. Support table 16
Is moved by a predetermined pitch by a feeding device (not shown). The support table 16 shown in FIG.
The position of is the position at the time when the insertion of the thickness direction thread z is almost completed.

A pair of brackets 17 (only one is shown) are erected on the base plate 15 at the rear side of the support table 16, and a pair of guide rods 18 are installed between the brackets 17 in parallel with the moving direction of the support table. ing. A support plate 19 is slidably supported by the guide rod 18. The support plate 19 is connected to a piston rod 20a of an air cylinder 20 fixed to the bracket 17, and can be moved back and forth a predetermined distance by the operation of the air cylinder 20.

A pair of support brackets 21 are erected on both front and rear ends of the support plate 19, and a movable body 2 is mounted on a guide rod (not shown) installed in parallel between the support brackets 21.
2 is slidably supported. A needle support 23 is fixed to the front end of the moving body 22. Insertion needles 24 as thickness direction thread insertion needles are horizontally fixed in one row at a predetermined pitch corresponding to the arrangement pitch of the pins 5 on the front portion of the needle support 23. The needle support 23 is arranged so as to pass through a hole (not shown) formed in the support bracket 21 on the front side.

The moving body 22 is fixed to a ball nut 26 of a ball screw mechanism 25. The rotation of the ball screw 29 that is normally and reversely rotated by the motor 27 through the belt transmission mechanism 28 causes the needle support 23 together with the moving body 22.
Penetrates the laminated yarn group 9 up to a standby position where the insertion needle 24 cannot engage with the laminated yarn group 9 supported by the support bracket 11 and a position where the needle hole 24a (shown in FIG. 6) is on the opposite side of the laminated yarn group 9. It is designed to be moved to the working position.

Behind the needle support 23, a row of guide rollers (not shown) for guiding the thickness direction thread z fed from a thickness direction thread supply portion (not shown) is arranged. A pair of upper and lower support rods 30 are slidably supported on the support bracket 21 while penetrating the support bracket 21. An air cylinder 32 is fixed to the support plate 19 near the rear support bracket 21 via a bracket 31 so as to extend in the front-rear direction. Both support rods 30
The rear ends are connected to each other via a connecting plate 33, and the connecting plate 33 is connected to the piston rod 32a of the air cylinder 32. A perforation needle support 34 is fixed to the front ends of both support rods 30, and perforation needles 35 are fixed to the perforation needle support 34 in a row at a predetermined pitch corresponding to the insertion needle 24. The row of piercing needles 35 is arranged in parallel with the row of the inserting needles 24 with an interval equal to the moving distance of the support plate 19 when the air cylinder 20 is operated. Air cylinder 3
By the operation of 2, the piercing needle support 34 is moved to the standby position where the piercing needle 35 cannot engage with the laminated yarn group 9 held by the support bracket 11 and the operating position where the piercing needle 35 penetrates the laminated yarn group 9. There is.

As shown in FIG. 7, an air cylinder 36 is provided on the base plate 15 in the vicinity of the support bracket 21 on the front side so as to extend in the front-rear direction, and the piston rod 36a thereof is provided.
A press plate 38 as a pressing member is fixed to the tip of the via a bracket 37. 9 (a), (b)
As shown in, the press plate 38 includes a support portion 38a having an L-shaped cross section that extends along the arrangement direction of the 24 rows of insertion needles, and a comb tooth portion 38b integrally formed with the support portion 38a. As shown in FIG. 9C, the insertion needle 24 and the piercing needle 3 are provided on both side surfaces of each comb tooth 39 formed on the comb tooth portion 38b.
5, the press plate 38 is formed with comb teeth 38b to form each insertion needle 24 or perforation needle 35.
It is possible to press the laminated yarn group 9 while sandwiching it. A concave portion 38c is formed on the surface of the comb tooth portion 38b facing the laminated yarn group 9. The press plate 38 is formed such that its width is slightly shorter than the distance between the support bar 7 and the inside of the main body 3a extending parallel to the support bar 7, and can press the laminated yarn group 9 without engaging with the frame body 3.

The press plate 38 is the support bracket 11
Is arranged on the standby position side of the insertion needle 24 and the perforation needle 35 with respect to the laminated yarn group 9 supported by, and is arranged so as to be movable along the movement direction of the 24 rows of the insertion needle near the insertion position of the 24 rows of the insertion needle. Has been done. The operation of the air cylinder 36 causes the press plate 38 to engage the laminated yarn group 9 supported by the support bracket 11 to press the laminated yarn group 9 toward the forward side of the 24 rows of insertion needles, and the laminated yarn group 9 cannot be engaged. It is moved to a different waiting position.

As shown in FIGS. 7 and 8, a pair of press blocks 40 and 41 as pressing members are arranged on the opposite side of the press plate 38 with the laminated yarn group 9 supported by the support bracket 11 interposed therebetween. ing. Both press blocks 4
Numerals 0 and 41 are formed such that the width of the contact portion with the laminated yarn group 9 is wider than the arrangement pitch of the pins 5, and each press block 40, 41 is a pair of levers 42 that are separately swingably supported above the laminated yarn group 9. It is fixed to the tip of each. Both press blocks 40 and 41 are arranged close to each other at a position facing the press plate 38 and at a position corresponding to the arrangement position of the recesses 39a so that a gap allowing the insertion of the insertion needle 24 or the perforation needle 35 is formed. Has been done. When the levers 42 are swung by the operation of an air cylinder (not shown), the press blocks 40 and 41 press the laminated yarn group 9 toward the backward side of the needle row, and the standby position where the laminated yarn group 9 cannot be engaged. And moved to.

Below the supporting position of the laminated yarn group 9, the insertion needle 2 is provided.
A retaining thread insertion needle (hereinafter simply referred to as retaining thread needle) 4 at a position corresponding to a position where four rows penetrate the laminated yarn group 9
3 is movably arranged along the arrangement direction of the 24 rows of insertion needles (a part of which is shown in FIGS. 6 and 8). The retaining thread needle 43 has a spatula at the tip, is reciprocated by a drive device (not shown), and is inserted into the insertion needle 2 when placed in the working position.
It is arranged in an operating position where it penetrates the loop of the thickness direction yarns z that are continuous in four rows, and a standby position that is retracted from the position corresponding to the laminated yarn group 9.

For convenience of illustration, the schematic diagram shown in FIG. 6 and the schematic diagrams shown in FIG. 3 differ from each other in the pitch and the number of pins 5 erected on the frame. Next, a method of manufacturing the three-dimensional fiber structure F using the frame 3 and the insertion device 8 configured as described above will be described.

First, the frame body 3 is used to form the laminated yarn group 9 on the outer side thereof. When supporting the frame body 3 when forming the laminated yarn group 9, the same attachment member 10 as when inserting the thickness direction thread z into the laminated yarn group 9 is used. However, as shown in FIGS. 2 and 11, the support bracket 44 is formed in a shape different from that of the support bracket 11. The frame 3 has mounting members 10 fixed to both ends thereof with bolts 12, and the mounting members 10 are fixed to the support brackets 44 with bolts 14, so that the support bar 7 is supported between the pair of support brackets 44 in an upper side. To be done. Then, in this state, the first in-plane arrayed yarn x, the second in-plane arrayed yarn y, and the bias yarn B are folded back in a state of engaging with the pins 5, respectively, as shown in FIGS. As shown in FIG. 5, they are respectively arranged, and an x-yarn layer, a y-yarn layer, and a bias yarn layer are laminated and formed. Various materials such as carbon fiber, glass fiber, and polyaramid fiber are used as the material of the fibers forming each yarn, depending on the application of the composite material.

A predetermined number of the above-mentioned yarn layers are laminated on the frame body 3 in a predetermined order, and a laminated yarn group 9 is formed on the outer side of the frame body 3 as shown in FIGS. In order to increase the density of the laminated yarn group 9 and adjust the thickness, the yarn layers are pressed from both sides with a press plate (not shown) each time the arrangement of each yarn layer is completed or every time when an appropriate yarn layer is formed. By pressing, the laminated yarn group 9 is compressed.

After the desired laminated yarn group 9 is formed, FIG.
As shown in FIG. 5, the frame 3 together with the laminated yarn group 9 is removed from the support bracket 44 together with the mounting member 10, and is set between the support brackets 11 of the insertion device 8 so that the thickness direction yarn z
Then, the yarn c for the corner portion is inserted. First, laminated yarn group 9
The thickness direction thread z is inserted into the portion excluding the corner portion of the.
When the thickness direction thread z is inserted, the press plate 38 is used, and the press blocks 40 and 41 have flat ends as shown in FIG. Also, FIG.
As shown in FIG. 3, the frame body 3 is supported in a state where the first plate-shaped portion 1 a positioned with the corner portion of the laminated yarn group 9 interposed therebetween is vertical and the thickness direction thread z is inserted from the inside of the frame body 3. Bracket 1
Supported by one.

Then, the support table 16 is arranged at the original position where the first end of the thickness direction thread insertion area of the laminated thread group 9 corresponds to the perforation needle 35, and the insertion needle 24, the perforation needle 35, the press plate 38 and the press. The operation of inserting the thickness direction yarn z into the laminated yarn group 9 is started from the state where the blocks 40 and 41 are arranged at the standby position.

FIG. 12 (a) shows the initial state after two insertion cycles of the thickness direction thread z have been completed. From this initial state, the air cylinder 36 and the like are operated, and as shown in FIG. 12B, the press plate 38 and both press blocks 4 are pressed.
0 and 41 are arranged in the operating position, and the laminated yarn group 9 is held in a compressed state at a position corresponding to the row of piercing needles 35. In this state, the air cylinder 32 is retracted and the piercing needle 35 moves forward, and the piercing needle 35 is placed at the working position where it penetrates the laminated yarn group 9, as shown in FIG. Since the piercing needle 35 moves while being guided by the recess 39a of each comb tooth 39, the piercing needle 35 is inserted perpendicularly to the laminated yarn group 9 even if the piercing needle 35 is slightly bent. In the laminated yarn group 9, the protruding side of the piercing needle 35 is pressed by both press blocks 40 and 41, so that the arrangement of the yarns is not disturbed when the piercing needle 35 is advanced. Next, the air cylinder 32 is actuated to project and the piercing needle 35 retracts. Since the fibers constituting the laminated yarn group 9 are densely arranged to some extent by the compression action of the press plate 38 and the press blocks 40, 41, the hole 9a is reliably formed in the trace of the punching needle 35.

Next, the air cylinder 20 is operated to project so that the row of perforating needles 35 and the row of inserting needles 24 are moved together with the support plate 19, and the row of inserting needles 24 corresponds to the hole 9a as shown in FIG. 12 (d). Is located in. Next, after the press block 40 is placed in the standby position, the ball screw 29 is driven to rotate in the forward direction and the insertion needle 24 is placed in the working position. The insertion needle 24 is inserted through the laminated yarn group 9 until the needle hole 24a appears in front of the laminated yarn group 9. After the insertion needle 24 reaches the forward end,
The motor 27 is reversely rotated and the insertion needle 24 is slightly retracted. As a result, as shown in FIG. 12 (e), a loop L is formed that allows the thread z in the thickness direction, which is continuous from the laminated thread group 9 to the needle hole 24a, to pass through the retaining thread needle 43.

When the insertion needle 24 is inserted through the laminated yarn group 9, the press block 40 is placed at the standby position and
The force to press is weakened. However, since the insertion needle 24 is inserted into the hole 9a formed by the perforation needle 35, the resistance at the time of insertion of the insertion needle 24 is small and the yarn arrangement of the laminated yarn group 9 is not disturbed.

Next, the retaining thread needle 43 is actuated to advance along the direction in which the insertion needle 24 is arranged. The retaining thread needle 43 passes through the loop L of each thickness direction thread z held by each insertion needle 24 one after another, and stops when it reaches the end of the laminated thread group 9. At this time, the retaining thread P connected to the retaining thread supply unit (not shown) is hooked on the tip of the retaining thread needle 43. Then, the retaining thread needle 43 is pulled back without closing the looper at the tip thereof so that the loop L is not retracted, and the retaining thread P is the loop L of the thickness direction thread z.
It is inserted in a folded shape inside.

After that, the motor 27 is driven in the reverse direction so that the insertion needle 24 retracts and is placed at the standby position where it is separated from the laminated yarn group 9. Further, the air cylinder is operated and the press block 40 is again placed in the working position. In this state, the thickness direction thread z is pulled back by the action of the tension adjusting portion (not shown), and the thickness direction thread z inserted in the laminated thread group 9 is tightened in the state where the thickness direction thread z is retained by the retaining thread P. Figure 12
The state shown in (f) is obtained. Since the recess 38c is formed in the contact surface of the comb tooth portion 38b with the laminated thread group 9 at a position corresponding to the recess 39a of each comb tooth 39, when the thickness direction thread z is pulled back, the thickness direction thread z is returned. Is prevented from being pulled in a state of being sandwiched between the contact surface and the laminated yarn group 9, and there is no fear that an unreasonable force is applied to the thickness direction yarn z.

Next, the air cylinder 20 is retracted and actuated, and the row of piercing needles 35 and the row of inserting needles 24 are moved leftward in FIG. 12 (f) together with the support plate 19 to return to the initial position shown in FIG. 12 (a). Be done. Further, the air cylinder 36 and the like are operated to press the press plate 38 and the press blocks 40, 4
1 is placed in the standby position. By the above, one insertion cycle of the thickness direction thread z is completed.

Next, the support table 16 is moved by the insertion pitch of the thickness direction thread z, and the piercing needle 35 is in a state of facing the next thickness direction thread insertion position into the laminated thread group 9. Thereafter, the insertion cycle of the thickness direction thread z is sequentially executed in the same manner as described above. As a result, the respective yarn layers forming the laminated yarn group 9 are joined by the thickness direction yarn z to form the one plate-shaped portion 1a of the three-dimensional fiber structure F. Next, the support state of the frame body 3 with respect to the support bracket 11 is changed so that the second plate-shaped portion 1b is vertical and the thickness direction thread z is inserted from the inside of the frame body 3. Then, the thickness direction thread z is inserted into the second plate-shaped portion 1b in the same manner as described above.

After the insertion of the thickness direction thread z into both plate-shaped parts 1a and 1b is completed, the corner part thread c is inserted into the corner part of the laminated thread group 9. When inserting the thread c for corners,
A press plate 45 and press blocks 46 and 47 having different shapes from those used when inserting the thickness direction thread z, and the number of insertion needles 24 corresponding to the number of the corner part threads c to be inserted into the corner parts are provided. Needle support 23 is used. In this case, the insertion needle 24 functions as a corner thread insertion needle.

As shown in FIG. 14A, the press plate 45 is arranged so that the comb teeth 45a have a shape corresponding to the shape of the corner of the three-dimensional fiber structure F. Further, as shown in FIG. 14 (b), the tip surfaces of the press blocks 46 and 47 are so arranged that the contact portions with the laminated yarn group 9 have a shape corresponding to the shape of the corner portion of the three-dimensional fiber structure F. Are formed so as to form an angle of 90 °.

Then, as shown in FIG. 13 and FIG.
The laminated yarn group 9 has a press block 4 on the outside of its corner.
6 and 47, and is supported in a state in which the plane that bisects the angle formed by both plate-shaped bodies 1a and 1b is horizontal.
In this state, the yarns c for corner portions are sequentially inserted row by row in the same manner as when the thread z in the thickness direction is inserted.

There are two differences from the insertion of the thread z in the thickness direction. One is that when the thread c for the corner portion is inserted, the pins 5 standing on the support bar 7 of the frame 3 are sequentially removed. ,
This is the point where the support bar 7 is sequentially pulled out. Another is that since the retaining threads P are arranged along the curved surface of the corner portion, the distance between the movement locus of the retaining thread needle 43 that moves linearly and the outer surface of the laminated yarn group 9 is not constant.

At the time when the insertion of the thickness direction thread z is completed,
The support bar 7 is arranged at a position corresponding to the corner portion of the laminated yarn group 9, and the pin 5 is erected on the support bar 7,
As it is, the corner portion thread c cannot be inserted. Therefore, prior to the insertion of the corner portion yarn c, the base end of the pin 5 erected on the support bar 7 is pulled out from the hole to be in the state of being positioned in the groove 7a. In this state, the support bar 7 can move relative to the laminated yarn group 9 along its longitudinal direction. And
Insertion needle 2 at a position corresponding to the insertion position of the corner thread c
4, press plate 45 and press blocks 46, 47
The support bar 7 is moved to a position where it does not hinder the arrangement, and the corner portion thread c is inserted with the hindrance pins 5 being sequentially removed.

Further, the distance between the movement locus of the retaining thread needle 43 that moves linearly and the outer surface of the laminated thread group 9 is not constant unlike when the thickness direction thread z is inserted. However, since the needle holes 24a of the respective insertion needles 24 are arranged so as to be positioned on a straight line, the insertion needles 24 are inserted into the laminated yarn group 9 and the yarn c for the corner portion continuous from the laminated yarn group 9 to the needle holes 24a. When the loop is formed, the ends of the loop are arranged in a row.
Therefore, when the retaining thread needle 43 advances in the state where the loop is formed, the retaining thread needle 43 surely passes through each loop and reaches the end of the laminated thread group 9, and the retaining thread needle 9 is removed from the laminated thread group 9. The retaining thread P connected to the supply unit is the retaining thread needle 4
It is hooked at the tip of 3. Then, when the retaining thread needle 43 is pulled back, the retaining thread P is inserted into the loop of the corner portion thread c in a folded shape. Then, after the insertion needle 24 retracts from that state and is placed at the standby position, when the yarn c for the corner portion is pulled back by the action of the tension adjusting portion, the retaining thread P is in a state along the curved surface of the corner portion. And the laminated yarn group 9
Arranged on top.

After the insertion of the corner portion yarn c into the entire insertion area of the corner portion yarn c of the laminated yarn group 9, the pins 5 are removed from the frame body 3 and the three-dimensional fiber structure F is formed into the frame body. Then, the three-dimensional fibrous structure F is completely manufactured.

When the press plates 38, 45 are placed in the working position near the second end of the frame body 3, the press plates 38, 45 interfere with the frame body 3 so that the press plates 38, 45 press them. Instead, the thickness direction yarn z or the corner portion yarn c is inserted. However, at this point, the insertion of the thickness direction yarn z or the corner portion yarn c into most of the yarn insertion area of the laminated yarn group 9 is completed. Therefore, most of the laminated yarn group 9 is in a state of being tightened by the thickness direction yarn z or the corner portion yarn c, while the thickness direction yarn z or the corner portion yarn c is inserted into the frame in the vicinity thereof. Since the body 3 is located, the press blocks 40, 4
The laminated yarn group 9 is held in a compressed state by 1, 46, 47 and the frame 3. As a result, the thickness direction yarn z can be obtained without pressing the laminated yarn group 9 by the press plates 38 and 45.
Insertion and tightening are performed smoothly.

This embodiment has the following effects. (A) In the corner portion of the three-dimensional fiber structure F, a plurality of corner yarns c are arranged in parallel with each other so as to intersect the yarn layers forming the plate portions 1a and 1b. Therefore, the force for connecting the yarn layers in the corner portion becomes strong, and the plurality of corner portion yarns c can be simultaneously and easily inserted into the laminated yarn group 9 by the reciprocating operation of the plurality of insertion needles 24.

(B) Since the plurality of corner portion yarns c are arranged in parallel and symmetrically with the plane that divides the angle formed by the adjacent plate-shaped portions 1a and 1b into two equal parts, when the composite material is used, The physical properties of the connection part become uniform. Further, the number of the corner portion yarns c at the connecting portion can be increased without inserting the corner portion yarns c into the regions of the plate-shaped portions 1a and 1b in which the thickness direction yarns z are inserted. Furthermore,
Since the yarn c for the corner portion is arranged at the same pitch as the yarn z in the thickness direction, more uniform physical properties can be achieved.

(C) Since the three-dimensional fiber structure F has five-axis orientation on all surfaces, the three-dimensional fiber structure F is arranged in an oblique direction as compared with the composite material using the three-dimensional fiber structure of orthogonal three-axis arrangement as a skeleton material. The amount of deformation with respect to the force is reduced, and high strength is exhibited not only against tensile load and compression load but also against torsion load.

(D) The laminated yarn group 9 is compressed in the state where the pin 5 does not exist at the compression position, and the position corresponding to the insertion region of the thickness direction yarn z or the corner portion yarn c for one row is a part. Compressed. Therefore, the press plates 38, 45 and the press blocks 40, 41, 46, 4 for compression are
7 can be operated with a small power, the vicinity of the position where the insertion needle 24 of the laminated yarn group 9 is inserted is efficiently compressed, and the laminated yarn group 9 is formed by the thickness direction yarn z or the corner portion yarn c and the retaining yarn P. Will be tightened smoothly.

(E) After the retaining thread P is inserted through the loop, in the process of retracting the insertion needle 24 from the laminated thread group 9 and pulling back the corner portion thread c to tighten the laminated thread group 9, the laminated thread group 9 is The press plate 45 and the press blocks 46 and 47 corresponding to the shape of the part are pressed from both sides. Therefore, even if the corner portion has a large curvature, the corner portion yarn c can be inserted while the three-dimensional fiber structure F is held in a desired shape.

(F) The pin 5 which is erected at the corner of the frame 3 is erected while being fitted in the hole formed at the bottom of the groove 7a formed in the support bar 7. Therefore, after the formation of the laminated yarn group 9 and the insertion of the thickness direction yarn z, when the corner portion yarn c is inserted, the base end of the pin projects into the groove 7a without pulling out the pin 5 from the laminated yarn group 9. Thus, the support bar 7 can be separated from the laminated yarn group 9. Therefore, the pin 5 at a position where it does not hinder the insertion of the corner yarn c is held in the laminated yarn group 9 until just before the insertion of the corner yarn c, and the yarn is arranged at a predetermined position. The corner thread c can be inserted with.

(G) Group of laminated yarns 9 formed on the frame 3
Is supported on the frame body 3 through the pin 5 until the insertion work of the thickness direction thread z and the corner portion thread c is completed,
The fibers of the yarns constituting the laminated yarn group 9 are three-dimensional fiber structures F.
The tension at the time of arrangement is maintained until the manufacturing of the is completed.
As a result, the straightness of the fibers constituting the three-dimensional fiber structure is improved as compared with the method of forming the laminated yarn group and then removing the laminated yarn group together with the pin from the base plate and holding it by another holding means. And the physical properties are improved.

(Second Embodiment) Next, a second embodiment will be described with reference to FIGS. As shown in FIG. 16, the three-dimensional fiber structure F of this embodiment is arranged so as to be orthogonal to the plane that divides the angle formed by the plate portions 1a and 1b adjacent to the corner portion yarn c into two equal parts. This is different from the above embodiment. That is, a plurality of corner yarns c
Are arranged at equal pitches with respect to the plate portions 1a and 1b at an angle of 45 °. This three-dimensional fiber structure F
When used as a composite material, is a resistance force against a force in a direction of changing an angle formed by both plate-shaped portions 1a, 1b, particularly a force for expanding a space between both plate-shaped portions 1a, 1b. Grows larger. Therefore, depending on how the force is applied to the corner portion when used as a composite material, the insertion direction of the yarn c for the corner portion is set to the first embodiment or the second embodiment. Can be selected.

When manufacturing this three-dimensional fiber structure F,
Press block 4 used when inserting yarn c for corners
6 and 47, as shown in FIG.
It differs from the first embodiment in that a shape having one inclined surface 46a, 47a inclined at an angle of 5 ° is used, and other members are the same. In each manufacturing process, exactly the same operation as in the first embodiment is performed until the thickness direction thread z is inserted. Then, after the insertion of the thickness direction thread z is completed, FIG.
As shown in (a), the laminated yarn group 9 is arranged between the support brackets 11 in a state where the outside of the corner is upward and the plane that divides the angle formed by both plate-like portions 1a and 1b into two is vertical. It Then, in this state, the yarn c for the corner portion is inserted.

The retaining thread needle 43 is reciprocated not in the vertical direction but in parallel with the inclined surfaces 46a, 47a of the press blocks 46, 47. Also in this embodiment, a plurality of corner portion yarns c can be easily and simultaneously inserted into the laminated yarn group 9 by the reciprocating movement of the insertion needle 24.

The present invention is not limited to the above-mentioned embodiments, but may be embodied as follows. (1) In the first embodiment, the plurality of corner portion yarns c may be arranged in parallel and symmetrically with a plane that divides the angle formed by the adjacent plate-shaped portions 1a and 1b into approximately two equal parts. Also in this case, the same effect as that of the first embodiment is exhibited.

(2) In the second embodiment, a plurality of corner portion yarns c may be arranged so as to be orthogonal to a plane that divides the angle formed by the adjacent plate-shaped portions 1a and 1b into approximately two equal parts. .
Also in this case, the same effect as that of the second embodiment is exhibited.

(3) The angle formed by the two plate-shaped portions 1a and 1b is not limited to 90 °, and the plate-shaped portions 1a and 1b may be formed so as to form an acute angle as shown in FIG. 18 (a). FIG.
As shown in (b), the plate portions 1a and 1b may be formed so as to form an obtuse angle. Further, even when the two plate-shaped portions 1a and 1b are formed so as to form an acute angle or an obtuse angle, the corner portion thread c is divided into two equal or almost equal to two equal to the angle formed by the plate-shaped portions 1a and 1b. You may insert so that it may be orthogonal to the surface to divide.

(4) The plurality of corner yarns c are arranged parallel to each other so as to intersect the x yarn layer, the y yarn layer and the bias yarn layer at the connecting portion between the adjacent plate-like portions 1a and 1b. It suffices that the plate-shaped portions 1a and 1b do not have to be parallel to the plane that divides the angle formed by the plate-shaped portions 1a and 1b into two equal parts or almost equal parts. Further, the arrangement intervals of the yarns c for corner portions are not limited to the equal pitch. The plurality of corner yarns c are parallel to each other at the connecting portion, and each plate-shaped portion 1
Since they are arranged so as to intersect with the yarn layers forming a and 1b, the physical properties (strength) of the connecting portion are increased when the composite material is formed. Further, when manufacturing the three-dimensional fiber structure, it becomes easy to insert a plurality of corner portion yarns c at the same time.

(5) The press blocks 40, 41, 46, which are arranged on the protruding side of the insertion needle 24 with respect to the laminated yarn group 9,
The number of 47 is not limited to one set, and may be one. When the number is one, when the insertion needle 24 is inserted into the laminated yarn group 9 in a state where the press block is arranged in the operating position, the loop of the thickness direction yarn z or the corner portion yarn c on the protruding side of the insertion needle 24 Place it on the side that does not interfere with the formation of.

(6) Both press blocks may be omitted. Even in this case, the thickness direction thread z or the corner portion thread c is pulled back and tightened while the insertion side of the insertion needle 24 of the laminated thread group 9 is pressed by the press plates 38 and 45, whereby the laminated thread group 9 has a predetermined shape. It is possible to tighten.

(7) The shape of the three-dimensional fiber structure F is not limited to the L-shape, but may be, for example, a U-shape shown in FIG. 19A, a box-shape shown in FIG. It is also applicable to the bottomed cylindrical shape shown in). As in the case of the L-shaped three-dimensional fiber structure F, such a three-dimensional fiber structure F is also provided with a regulating member composed of a large number of pins 5 or pipes or the like mounted on a frame body of a corresponding shape. Can be manufactured using

(8) The contact surfaces of the press plates 38, 45 with the laminated yarn group 9 may be made flat. Also, the comb teeth 39
The gap 39a may be made slightly larger than the outer diameters of the insertion needle 24 and the piercing needle 35 to omit the recess 39a.

(9) The pressing force by the press plates 38, 45 can be adjusted so that the pressing force of the press plates 38, 45 is weakened when the piercing needle 35 and the insertion needle 24 are inserted, and is pressed when the thickness direction thread z is pulled back. The pressure may be increased. Alternatively, the press plates 38 and 45 may be placed in the standby positions when the punching needle 35 and the insertion needle 24 are inserted, and only the press block may be placed in the working position. In this case, since the perforation needle 35 and the insertion needle 24 are inserted into the laminated yarn group 9 in a state where the fibers are not densely compressed, the resistance at the time of insertion of the perforation needle 35 and the insertion needle 24 is reduced, and the insertion can be smoothly performed. .

(10) The laminated yarn group 9 has at least the in-plane 2
It suffices if the axial orientation is adopted, and the bias yarn B is eliminated to provide in-plane biaxial orientation, or the pair of bias yarns B arranged so as to intersect each other is ± 60 ° with respect to the second in-plane aligned yarn y.
The first in-plane array yarn x may be eliminated and the in-plane triaxial orientation may be performed. Further, even in the in-plane four-axis orientation, the bias yarn B forming the laminated yarn group 9 may have an inclination angle other than 45 °.

(11) Depending on the thickness of the laminated yarn group 9 and the type of fiber, the insertion needle 24 may be directly inserted into the laminated yarn group 9 without punching with the piercing needle 35. (12) Instead of moving the insertion needle 24 in the horizontal direction, the insertion needle 24 may be moved in the vertical direction, and the arrangement of each part may be changed correspondingly.

(13) The corner portion yarns c may be inserted one by one by the chain stitch method. Also in this case, when the corner portion yarn insertion needle is inserted into the laminated yarn group 9, the corner portion yarn insertion needle can be reciprocated at a constant angle to be inserted at a predetermined position.

(14) The yarn c for corner portions may be inserted before the insertion of the yarn z in the thickness direction is completed. Inventions other than those described in the claims that can be grasped from the embodiment and the modifications will be described below together with their effects.

(1) A frame body in which a plurality of plate-like portions are formed in a shape corresponding to the shape of a three-dimensional fiber structure which is continuous in a bent state at a connecting portion, and regulating members are arranged at a predetermined pitch. A frame in which a groove is formed along the longitudinal direction of a support member that is removably arranged at the corner, and a restriction member is detachably erected in holes formed at a predetermined pitch at the bottom of the groove. body. In this case, the supporting member can be removed from the frame while the laminated thread group is supported by the frame body while the regulating member is inserted into the laminated thread group.

[0079]

As described in detail above, the first to third aspects of the invention are described.
According to the invention described in (3), it is possible to enhance the physical properties of the connecting portion of the three-dimensional fiber structure in which the plurality of plate-shaped portions are formed in the connecting portion in a continuous shape in a bent state, and at the same time, the yarn layer is formed in the connecting portion. It is possible to simplify the work of inserting the thread to be joined.

According to the second aspect of the invention, the physical properties of the connecting portion when the composite material is made uniform, and the yarn for the corner portion is not inserted in the region of the plate portion into which the yarn in the thickness direction is inserted. In addition, the number of yarns for the corner portion of the connecting portion can be increased, and the binding force of the laminated yarn group can be increased.

According to the third aspect of the invention, when the composite material is used, the resistance against the force in the direction in which the angle formed by the adjacent plate-shaped portions changes becomes large. According to the invention described in claim 4, a plurality of yarns for the corner portion can be easily inserted into the laminated yarn group at the same time, and even when the corner portion has a large curvature, the laminated yarn group is held in a predetermined shape. Threads can be inserted.

According to the fifth aspect of the invention, the vicinity of the insertion position of the corner yarn of the laminated yarn group is efficiently compressed, and the laminated yarn group is smoothly tightened by the corner yarn and the retaining yarn.

[Brief description of drawings]

FIG. 1 is a schematic perspective view of a three-dimensional fiber structure according to a first embodiment.

FIG. 2 is a side sectional view showing a state in which a laminated yarn group is formed on a frame body.

FIG. 3 is a schematic view showing an arrangement state of each thread layer.

FIG. 4 is a schematic perspective view of a frame body.

FIG. 5 is a partial side view of the frame body.

FIG. 6 is a schematic perspective view showing a state in which a thickness direction thread is inserted.

FIG. 7 is a schematic partial plan view of the insertion device.

FIG. 8 is a schematic side sectional view showing a state where the frame body is supported by the support bracket.

FIG. 9A is a partial plan view of a press plate,
(B) is a sectional view of the same and (c) is a partially enlarged plan view of the comb teeth.

FIG. 10 is a schematic perspective view showing a state in which a laminated yarn group is formed on a frame.

FIG. 11 is a front view showing a supporting state of the frame body when forming the laminated yarn group.

FIG. 12 is a schematic cross-sectional view showing a procedure for inserting a thickness direction thread.

FIG. 13 is a side sectional view showing a supporting state of the frame body when the yarn for the corner portion is inserted.

FIG. 14A is a schematic perspective view of a press plate,
(B) is a schematic perspective view of a press block.

FIG. 15 is a schematic diagram showing an arrangement of a laminated yarn group when inserting a yarn for a corner portion.

FIG. 16 is a schematic perspective view of the three-dimensional fiber structure according to the second embodiment.

FIG. 17A is a side sectional view showing a supporting state of the frame body when the yarn for the corner portion is inserted, and FIG. 17B is a schematic perspective view of the press block.

FIG. 18 is a schematic side view of a modified three-dimensional fiber structure.

FIG. 19 is a schematic perspective view of a three-dimensional fiber structure according to another modification.

FIG. 20 is a schematic side view of a conventional three-dimensional fiber structure.

FIG. 21 is a schematic perspective view of a conventional frame body.

22A is a partial schematic perspective view in which a press plate is similarly arranged, and FIG. 22B is a schematic cross-sectional view showing a z-thread insertion state.

[Explanation of symbols]

1a, 1b ... plate-like portion, 2 ... corner portion as connecting portion, 3
... frame body, 5 ... pin as restriction member, 7 ... support bar as support member, 7a ... groove, 8 ... insertion device, 9 ... laminated yarn group, 24 ... insertion needle as yarn insertion needle for corner portion, 24a
... needle holes as holding portions, 45 ... press plates as pressing members, 46, 47 ... press blocks as pressing members, B ... bias yarns, c ... yarns for corner portions, F ... three-dimensional fiber structure, x ... 1st in-plane arrangement | positioning thread, y ... 2nd in-plane arrangement | positioning thread, z ... thickness direction thread, L ... loop, P ... retaining thread.

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Junji Takeuchi, 2-chome, Toyota-cho, Kariya city, Aichi Prefecture Toyota Industries Corporation (56) Reference JP 3-119138 (JP, A) JP HEI 2-229239 (JP, A) JP 5-59634 (JP, A) JP 4-289241 (JP, A) JP 3-8833 (JP, A) JP 2-191742 (JP, A) (58) Fields surveyed (Int.Cl. ⁷ , DB name) D03D 25/00 D03D 41/00

Claims (5)

(57) [Claims] 1. A laminated yarn group in which a plurality of plate-shaped portions are formed in a continuous shape in a bent state at a connecting portion and each plate-shaped portion is formed by laminating a plurality of yarn layers and has at least biaxial orientation. And at least three axes including the thickness direction yarns arranged in the thickness direction, extending in a direction intersecting the connecting portion of the adjacent plate-shaped portions and orthogonal to the thickness direction of each plate-shaped portion. A plurality of corner yarns arranged along the surface and having as a constituent element a yarn continuous across both plate-like portions and arranged so as to intersect the yarn layer at the connecting portion. Three-dimensional fiber structure arranged parallel to each other. 2. The tertiary yarn according to claim 1, wherein the plurality of corner yarns are arranged in parallel and symmetrically with a plane that divides an angle formed by adjacent plate-shaped portions into two equal parts or approximately two equal parts. Original fiber structure. 3. The three-dimensional structure according to claim 1, wherein the plurality of corner yarns are arranged so as to be orthogonal to a plane that divides an angle formed by adjacent plate-shaped portions into two equal parts or approximately two equal parts. Fiber structure. 4. A frame body in which a plurality of plate-shaped portions are formed in a shape corresponding to a shape of a three-dimensional fiber structure which is continuous in a bent state at a connection portion, and regulating members are arranged at a predetermined pitch. After forming a laminated yarn group having at least biaxial orientation by laminating a plurality of yarn layers in which the yarns are arranged in a folded manner between the regulating members, a three-dimensional fiber structure is obtained with the laminated yarn group held in the frame body. In the plate-shaped portion other than the portion corresponding to the corner portion of the body, the thickness direction threads are inserted so as to be orthogonal to the plurality of thread layers forming each plate-shaped portion, and the insertion of the corner portion thread is performed.
A plurality of corner thread insertion needles arranged in a row are pierced together with the corner thread into the laminated thread group at the same time and until the corner thread holding portion comes out of the laminated thread group. The step of forming a loop of the yarn for the corner portion on the protruding side, the step of inserting the retaining thread into the loop along the direction of arrangement of the yarn inserting needle for the corner portion, and the retaining thread being inserted into the loop Thereafter, at least a pressing member corresponding to the shape of the corner portion is arranged on the insertion side of the yarn inserting needle for the corner portion to press the laminated yarn group, and the step of pulling back and tightening the yarn for the corner portion is repeated to repeat the corner portion. A method for producing a three-dimensional fiber structure, wherein a yarn for use is inserted into a predetermined insertion area, and then the laminated yarn group is removed from the frame. 5. After the retaining thread is inserted into the loop, in the step of pulling back and tightening the yarn for the corner portion, the laminated yarn group is pressed from both sides by a pressing member corresponding to the shape of the corner portion. The method for manufacturing the three-dimensional fiber structure according to claim 4.