JPH07111017B2 - Three-dimensional fabric and manufacturing method thereof - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to three components of an axial thread, a circumferential thread, and a radial thread that is bent and arranged so as to extend in a radial direction and an axial direction in a plane including a shaft. The present invention relates to a three-dimensional woven fabric composed of the above yarn and a method for manufacturing the same.

[Prior Art] A composite material in which a three-dimensional woven fabric is a skeletal material and a resin or an inorganic material is a matrix is expected to have a wide range of applications as a structural material for rockets, aircrafts, automobiles, ships and buildings. Conventional three-dimensional woven fabrics include quadrangular prismatic or plate-like fabrics and annular fabrics. Conventionally, as an annular three-dimensional woven fabric, as shown in FIG. 13 of Japanese Patent Application Laid-Open No. 56-142053, a carbon fiber made of resin solidified in a large number of holes formed on the peripheral surface of a mandrel (core material) M. The rods h of the three-dimensional annular fabric are inserted in the form of multiple threads in the radial direction, and in that state, threads hc are arranged between the rods R in a plane substantially orthogonal to the axis.
And the threads hd arranged in a plane diagonally intersecting the axis,
A three-dimensional annular fabric formed by sequentially winding the yarn hd and a yarn hg inclined in the opposite direction around the mandrel M has been proposed.

The three-dimensional annular fabric is composed of radial yarns arranged in the radial direction of the annular fabric, meridian yarns arranged in the axial direction along the inner peripheral surface, and circumferential yarns arranged in the circumferential direction. It is known that the radial yarns are folded inside and outside the annular fabric to prevent the circumferential yarns arranged at the outermost and innermost circumferences of the annular fabric from being separated from the annular fabric. Has been. As a method for producing a three-dimensional annular fabric having this structure, Japanese Patent Laid-Open No. 61-201063 discloses a first method.
As shown in Figs. 4 and 15, a large number of thread guide tubes are provided on a cylindrical substrate 61.
62 are inserted radially and movably outward in the radial direction, and plate-shaped spacers 63 are radially arranged between the thread guide tubes 62 adjacent to each other on the surface of the substrate 61, and along the tips thereof. A method is disclosed for producing a three-dimensional annular fabric using a core that is wound and secured by wires 64 that extend in an annulus between thread guide tubes 62.

In this method, first, the first endless thread 65 is folded back at both ends of the core material in the axial direction of the substrate 61, that is, in the direction orthogonal to the paper surface of FIG.
The first endless yarn 65 is wound around the layer of the endless yarn 65 in the circumferential direction of the substrate 61. Then, this operation is repeated a predetermined number of times (n times) to form a laminated body of the first endless yarn 65 on the spacer 63. Next, the loop of the second endless thread 66 is inserted from the inside of the substrate 61 into the inside of the thread guide tube 62, and the thread guide tube 62 is pulled out to the outer surface of the stack of the first endless threads 65 to remove it. The loop of the second endless thread 66 is pulled out to the outer surface of the stack of the endless thread 65 of FIG. Then, the second endless thread 66 pulled out.
Insert the third endless thread 67 into the loop as a thread
The second endless yarn 66 and the third endless yarn 67 are used to tighten the stack of the first endless yarn 65 to produce a three-dimensional annular fabric.

[Problems to be Solved by the Invention] However, in the manufacturing method disclosed in Japanese Patent Laid-Open No. 56-142053, not only is it troublesome to insert the rod R into the mandrel M before winding the yarn, but also each yarn There is a disadvantage that voids are likely to occur between each other and between the yarn and the rod, it is difficult to increase the ratio of the fibers occupying the woven fabric column, and the work of removing the mandrel M after completion of winding is troublesome. In addition, since the distance between the rods R increases toward the outside, there is also a problem that the density of the yarn in the radial direction decreases in the outer layer of the three-dimensional fabric. Furthermore, the structure made by this method is annular, and it is not possible to form columns filled with fibers up to the center.

On the other hand, in the method disclosed in JP-A-61-201063,
Work of inserting the second endless thread 66, which constitutes the thread arranged in the radial direction of the annular fabric, into the thread guide tube 62 and the guide tube 62 as a substrate
The work of removing it from 61 and inserting the third endless thread 67 as a barbing thread into the loop of the second endless thread 66 is extremely delicate and complicated, and reproducibility as an industrial product because it has to rely on human hands, Unreliable. Moreover,
At least the wall thickness of the thread guide tube 62 reduces the thread density that constitutes the annular woven fabric, and although it can be slightly improved by tightening with the endless threads 66 and 67, with a strong ironing action, with a low elongation material such as carbon, There is an inconvenience of being damaged and inevitable from feathering. In addition, there is a problem similar to the former, such that the outer layer is limited to a circular ring structure having a lower radial yarn density.

The present invention has been made in view of the above problems, and its object is to weave by a simpler method than a conventional method for producing a three-dimensional annular fabric, and further, to eliminate the problems that they have. It is intended to provide a three-dimensional woven fabric having a different structure and a method for producing the same.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the three-dimensional fabric of the present invention comprises a large number of axial yarns (z) arranged in a multilayer state in the radial direction from the central portion and extending along the axial direction. , A circumferential thread (y _θ ) inserted between layers of the axial thread (z) along the circumferential direction, and a circumferential thread (y _θ ) between any layers of the circumferential thread (y _θ ) in a cross section including the axis. y _θ ), and is composed of a large number of radial threads (y _rz ) inserted in a meandering state continuously in the axial direction and the radial direction so that only the circumferential threads (y _θ ) are _wound . .

Also, in the method for manufacturing a three-dimensional woven fabric, an axial yarn (z) extending along the axial direction is stretched between two yarn supports at the center of the woven fabric, and a large number of remaining axial yarns (z) are provided. And the radial yarns (y _rz ) are radially arranged with the ends thereof fixed to the yarn support so as to form a multi-layered state from a predetermined center, and the ends of the circumferential yarns (y _θ ) are near the fabric center. Fixed to. One of each layer is formed by winding the circumferential yarn (y _θ ) from the outside of the axial yarn (z) and the radial yarn (y _rz ) forming the multilayer so as to press the layer to the center portion, The axial thread (z) and the radial thread (y _rz ) corresponding to each layer are
By moving in the axial direction while maintaining the radial position, the opening position is changed and the circumferential yarn (y _θ ) is wound.
The radial thread (y _rz ) is arranged along the axial direction for a predetermined length and then bent in the direction orthogonal to the axial thread (z), and part of the circumferential thread (y _θ ) is selected by selecting the opening position. It is linearly arranged so as to extend again along the axial thread (z) between arbitrary layers, and the rest is arranged in the radial direction without being wound from the outside of the circumferential thread (y _θ ) to meander. The opening position of the radial thread (y _rz ) was changed so as to be woven, and the circumferential thread (y _θ ) was wound.

[Operation] The three-dimensional woven fabric of the present invention is composed of three types of yarn groups, of which the circumferential yarn (y) wound in multiple layers along the circumferential direction of the woven fabric.
_Since there are a large number of radial threads (y _rz ) which are orthogonal to the circumferential thread (y _θ ) between any layers of ( _θ ), and are inserted in a meandering state continuously in the axial direction and the radial direction, the radial thread By changing the insertion position and the folding position of (y _rz ) with respect to the circumferential yarn (y _θ ), the yarn density in the radial direction at the outer peripheral portion can be arbitrarily selected, and therefore the density is the same as that at the inner peripheral portion. It is also possible easily. By changing the arrangement of the three types of yarns including these changes, it is possible to change the physical properties and the shape of the woven fabric.

Further, in the manufacturing method according to the second aspect, a state in which the end portions of a large number of axial threads (z) and radial threads (y _rz ) are fixed to the thread support so as to form a multi-layer state from a predetermined center. The weaving is started in a state where the end portions of the circumferential yarns ( _yθ ) are fixed to the yarn support while being radially arranged. The circumferential thread (y _θ ) is sequentially inserted between the layers of the axial thread (z) corresponding to the open state of the axial thread (z), and the circumference of the axial thread (z) of the corresponding layer is also provided. Wrapped around. The winding as radial shed position is changed circumferential direction thread from the outside of the (y _rz) (y θ) is crimped radially yarn (y _rz) to the inner radial yarn (y _rz) by being, woven parallel to the radial direction yarns to any layers of circumferential yarn (y _θ) (y _rz) in the circumferential direction yarns (y _theta) and perpendicular state or axial yarns (z). Therefore, by changing the opening position of the radial yarns (y _rz), the return position in the radial direction of the radial threads (y _rz) it is possible to change the desired position, the radial yarns (y _rz By appropriately changing the axial length and the radial length of), it becomes possible to manufacture three-dimensional woven fabrics having various structures.

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

As shown in FIG. 5, the three-dimensional loom is configured to be divided into upper and lower parts with a weaving portion of the three-dimensional fabric sandwiched between them, and a thread fixing table 1 is integrally lifted up and down with a spline shaft 2 at the lower center. It is arranged to be movable and rotatable. A support 4 having a large number of radially extending arms 3 is supported on the spline shaft 2 so as to be integrally rotatable with the spline shaft 2 at a predetermined position, and the spline shaft 2 is vertically moved with respect to the support 4 by a drive mechanism (not shown). It is possible to move to. An air cylinder 5 is fixed to the tip of each arm 3 so as to extend upward. At the tip of the piston rod 5a of the air cylinder 5, a bobbin holder 6 made of a magnetic material is formed by the action of an electromagnet.
A holder holding body 7 for adsorbing and holding is attached. A bobbin B around which a radial thread (y _rz ) is wound is detachably attached to the bobbin holder 6.

Above the thread fixing table 1, the other end of the central axis thread is gripped, and at the same time, the thread fixing table 8 as a thread support for fixing all three types of threads constituting the fabric is symmetrical with the thread fixing table 1. Is arranged so as to be able to move up and down and rotate integrally with the spline shaft 9. A support 11 having a large number of arms 10 extending radially like the support 4 is fitted to the spline shaft 9 so as to be integrally rotatable with the spline shaft 9 at a predetermined height position. Although the spline shafts 2 and 9 are completely separated, they are rotated in a predetermined direction and moved up and down in synchronization with each other. An air cylinder 12 is fixed to the tip of each arm 10 so as to extend downward,
A holder holder 13 is attached to the tip of the piston rod 12a for holding the bobbin holder 6 made of a magnetic material by the action of an electromagnet in the same manner as described above. The holder holder 7,
The same upper and lower pairs of 13 are always opposed to each other, so that the same one bobbin holder 6 can be delivered by raising and lowering the holder holders 7 and 13 by the operation of the air cylinders 5 and 12 and demagnetizing the electromagnet. Has become.

A guide frame 14 for restricting the weaving position is arranged on the central upper surface of the support body 4. Guide frame 14
A circumferential thread supply portion 15 is arranged in the outer peripheral direction of the bobbin holder 6 at a position substantially the same as the upper end surface of the bobbin holder 6. The support frame 16 that constitutes the circumferential thread supply unit 15 includes the spline shafts 2, 9
A circumferential thread bobbin 17 around which the circumferential thread ( _yθ ) is wound is detachably mounted on the outer peripheral side thereof. Further, on the inner peripheral side of the support frame 16, the circumferential yarn (y _θ ) fed from the circumferential yarn bobbin 17 is provided.
A yarn guide 18 for guiding the yarn to the weaving position and an appropriate yarn tension applying device are provided if necessary. Thread guide
18 is made of a wear resistant material.

Next, the weaving action of the three-dimensional fabric by the above device will be described.

Prior to weaving a three-dimensional woven fabric, first, an axial thread (z) is stretched between the center portions of both thread fixing tables 1 and 8, and the radial direction is assembled from the bobbin B mounted on each bobbin holder 6. One end of the yarn (y _rz ) is fixed to the upper yarn fixing table 8 from the center so as to form a multi-layered state. As a result, the radial threads (y _rz ) are arranged radially around the spline shafts 2 and 9 as shown in FIG. Further, one end of the circumferential thread (y _θ ) fed from the circumferential thread bobbin 17 is fixed to the upper thread fixing table 8. Then, each bobbin holder 6 corresponds to the weaving condition, and the upper and lower holder holders 7,
Weaving is started from the state of being held at 13.

As shown in FIG. 5, in the radial direction (y _rz ) delivered from the bobbin holder 6, the bobbin holder 6 is delivered from the circumferential thread bobbin 17 in a raised position held by the upper holder holding body 13. The bobbin holder 6 is located above the circumferential thread (y _θ ) and is in the lowered position where the bobbin holder 6 is held by the lower holder holding body 7, as shown by the two-dot chain line in the figure. It is arranged at a position intersecting with the yarn (y _θ ). Therefore, when the holder holding bodies 7, 13 revolve with the rotation of the spline shafts 2, 9, when the bobbin holder 6 passes through the position intersecting with the circumferential yarn supplying section 15 in the lowered position, the radial yarn ( The fabric side end of (y _rz ) is fixed by the circumferential yarn (y _θ ) fed from the circumferential yarn bobbin 17 so as to extend along the axial direction on the circumferential surface of the three-dimensional fabric in the process of weaving.

FIGS. 7 (a1) and (a2) show the state when weaving the three-dimensional woven fabric F shown in FIGS.
The Y-section is shown. From this state (b1),
As shown in (b2), the radial thread (y _rz1 ) connected to the bobbin B ₁ is extended so as to be close to the upper end surface of the guide frame 14 by the bobbin holder 6 being held by the holder holding body 7 in the lowered position. , Other bobbins B ₂ ,, B ₃ ,, B ₄ , B ₅ , B ₆
5 radial threads (y _rz2 , y _rz3 , y _rz4 , y _rz5 ,
y _rz6 ) are bent and held in the raised position by the holder holder 13 so as to be close to the thread fixing table 8. When the spline shafts 2, 9 are rotated three times, the first layer of the circumferential thread (y _θ ) is wound around the axial thread (z) stretched between the centers of the two thread fixing tables 1, 8. Together with the bobbin _holder 6 arranged in the lowered position, the radial thread (y _rz1 )
Is woven inside the circumferential thread (y _θ ), and
As shown in 1) and (c2), the circumferential yarn (y _θ ) is wound around the axial yarn (z) in three stages. As a result, the radial thread (y _rz1 ) is axially crimped inside the first layer circumferential thread (y _θ ) and the other five radial threads that have been bent outward are , Keep unrestrained.

Next, as shown in FIGS. 7 (d1) and (d2), the bobbins B ₅ and B ₆ are transferred from the holder holder 13 in the raised position to the holder holder 7 in the lowered position, respectively, and are connected to the bobbins in the radial direction. The threads (y _rz5 , y _rz6 ) are close to the upper end surface of the guide frame 14.
In this state, the spline shafts 2, 9 are rotated and the circumferential yarn ( _yθ ) of the second layer is wound in three stages as described above,
The radial threads (y _rz5 , y _rz6 ) are crimped in the axial direction, and the radial threads (y _rz2 , y _rz3 , y _rz4 ) that were bent outward are not restrained as they are, The states shown in Figures (e1) and (e2) are obtained. Next, Fig. 7 (f
1) and (f2), the bobbin B ₃ is transferred from the raised position to the lowered position in the same manner as above, and then the circumferential thread (y _θ ) is wound by the rotation of the spline shafts 2 and 9, The states of Fig. 7 (g1) and (g2) are obtained, and the weaving of the first stage is completed.

Next, the spline shafts 2, 9 are moved up to pull up the three-dimensional fabric F by a predetermined amount, and the bobbin arranged in the lowered position.
B ₁ , B ₃ , B ₅ , B ₆ are transferred to the raised position, while bobbin B ₂ is transferred to the lowered position, and the radial threads of the radial threads shown in FIGS. 7 (h1) and (h2) are shown. After the arrangement state, the circumferential thread (y _θ ) is wound by the rotation of the spline shafts 2 and 9, and the radial thread (y _rz2 ) connected to the bobbin B ₂ is shown in FIG.
As shown in 1), it is arranged from the outermost layer of the fabric to the inside of the first layer of the circumferential yarns (y _θ ). Then the 7th
As shown in Fig. (J2), the bobbins B ₅ and B ₆ are transferred from the ascending position to the descending position, and the radial threads (y _rz5 , y _rz6 ) connected to the respective bobbins are close to the guide frame 14, As the spline shafts 2 and 9 rotate, they are crimped inward by the circumferential thread (y _θ ) to obtain the states shown in FIGS. 7 (k1) and (k2). In this case, the radial yarns (y _rz5 , y _rz6 ) that were in the state of extending in the axial direction between the first layer and the second layer of the circumferential yarn (y _θ ) in the first stage weaving are both in the axial direction as they are. Be extended to. Next, as shown in FIG. 7 (l2), when the bobbin B ₄ is transferred from the raised position to the lowered position and the circumferential yarn (y _θ ) is wound by the rotation of the spline shafts 2 and 9, FIG. m
As shown in 1) and (m2), the radial thread (y _rz4 ) connected to the bobbin B ₄ moves from the outermost position to the second thread of the circumferential thread (y _θ ).
The short radial and axial sections are formed between the layers and the third layer in a constricted manner, completing the second stage weaving.

Next, as shown in FIGS. 7 (n1) and (n2), the spline shaft 2,
9 is moved up and the three-dimensional fabric F is pulled up by a predetermined amount,
The bobbin B ₁ is moved to the lowered position, the bobbins B ₂ , B ₄ , B ₅ and B ₆ are moved to the raised position, the spline shafts 2 and 9 are rotated and the circumferential thread (y _θ ) is wound, and the bobbin B is moved. _The radial yarns (y _rz1 ) continuous with 1 are arranged in the axial direction continuously in the radial direction from the outermost peripheral position of the three-dimensional fabric F to the inner layer, and as shown in FIG. 7 (o1),
The yarn arrangement state of (o2) is obtained. Subsequently bobbin B _5, B ₆ as shown in FIG. 7 (p2) and is transferred to the lowered position, the circumferential yarn by the rotation of the spline shaft 2,9 (y _θ) is wound, the bobbin B _5, B _The yarns in the radial direction (y _rz5 , y _rz6 ) connected to ₆ continuously form the axial yarn, and the yarn arrangement states of (q1) and (q2) of FIGS. 7A and 7B are obtained. Then the bobbin B ₃ as shown in FIG. 7 (r2) was transferred to the lowered position, the circumferential yarn by the rotation of the spline shaft 2,9 (y _θ) is wound, the bobbin B ₃
The radial thread (y _rz3 ) connected to the second thread is the second thread of the circumferential thread (y _θ ).
Narrow pressure is applied between the layers and the third layer to form short radial and axial portions, resulting in the yarn arrangement shown in FIGS. 7 (s1) and (s2), completing the third stage. After that, weaving is sequentially continued in the same manner, and the cylindrical three-dimensional woven fabric F having the axial thread (z) in the center is woven.

The cross section of the three-dimensional fabric obtained in this weaving direction is shown in FIGS. In this weaving method, the specific bobbin holder 6 is always kept in the lowered position at the time of its revolution, so that the radial threads (y _rz5 , y _rz6 ) _fed from the bobbin holder 6 are always along the axial direction. Woven so as to extend, and after weaving, the axial thread (z) of the three-dimensional fabric F
Becomes The other radial threads (y _rz ) are alternately folded back between the inner side of the first layer and the outer side of the third layer of the circumferential thread (y _θ ), and the inner side of the second layer and the third layer Three types, one that is alternately folded back to the outside of the eye and one that is alternately folded back between the inner side and the outer side of the third layer, are woven in a state in which they are regularly repeated.

[Second Embodiment] Next, a second embodiment will be described with reference to FIGS. In the three-dimensional woven fabric F of this embodiment, there is no axial thread (z) at the center, and all the radial threads (y _rz ) are inside the innermost layer of the three circumferential threads (y _θ ). And the point of being alternately folded back between the outermost layer and the outermost layer are largely different from the three-dimensional fabric F of the above-mentioned embodiment. In such a structure, the distance between the adjacent radial threads (y _rz ) becomes wider toward the outside of the three-dimensional fabric F, so that the number of axial threads (z) woven between the radial threads (y _rz ) is It is more outside.

When weaving this three-dimensional woven fabric F, radial threads (y _rz ) are prepared in the same manner as in the above-mentioned embodiment, and instead of the axial threads (z) between the central portions of the thread fixing tables 1 and 8. Weaving is performed with a cylindrical or cylindrical cored bar installed.
Then, the radial thread (y
_rz ) open state is changed regularly, circumferential thread (y _θ )
Between the innermost layer and the outermost layer of the circumferential thread (y _θ ) is the radial thread (y _rz ) that is woven between the first and second layers to become the axial thread (z). _Are arranged alternately with the radial threads (y _rz ) that are woven in such a manner that they are folded back alternately, and are woven between the second and third layers of the circumferential threads (y _θ ) to form the axial threads (z). The adjacent radial threads (y _rz ) are woven in such a manner that the radial threads (y _rz ) are alternately folded back between the innermost layer and the outermost layer of the circumferential thread (y _θ ).
_rz ) so that two yarns are arranged between them in the circumferential direction ( _yθ )
Is wrapped around.

The present invention is not limited to the above-mentioned embodiments, and for example, each radial thread (y _rz ) is arranged in a stepwise manner so as to bend between each layer of the circumferential thread (y _θ ) and between each step. Or
As in the first embodiment, the radial thread (y _rz ) is the circumferential thread (y _rz ).
_θ ), which is alternately folded back between the inner side of the first layer and the outer side of the third layer, which is alternately folded back between the inner side of the second layer and the outer side of the third layer, and the third layer In the three-dimensional woven fabric F having a structure in which three kinds, that is, the one that is alternately folded back between the inner side and the outer side, are woven in a state of being regularly repeated, the folding position of each radial thread (y _rz ) is set in the axial direction. 1
As shown in Fig. 11, the yarns in the circumferential direction (y _θ ) are shifted by steps.
_May be arranged alternately with radial threads (y _rz ) with respect to the axial direction. Further, by changing the number of layers of the circumferential yarn (y _θ ) wound around the axial yarn (z) and the radial yarn (y _rz ) in the axial direction of the fabric, as shown in FIG. It is also possible to weave a three-dimensional fabric whose thickness changes along the direction. Also, by weaving the axial fixing thread (z) between the centers of the thread fixing tables 1 and 8 in an elliptic cylindrical shape, an elliptic cylindrical three-dimensional woven fabric can be manufactured. It is possible to manufacture an elliptic cylindrical three-dimensional woven fabric by fixing the core metal of the elliptic cylinder and weaving it and then removing the core metal. Also, instead of both holder holders 7 and 13 being able to move up and down, only one of them can be moved up and down, or support bodies 4 and 11 are used for winding the circumferential thread (y _θ ).
Instead of rotating the side, the circumferential yarn supplying section 15 side may be revolved around the yarn fixing tables 1 and 8. Furthermore,
A plurality of circumferential thread supply units 15 may be provided, or the thread ends of the circumferential thread (y _θ ) may be fixed by any means such as being sandwiched between the axial threads (z).

[Effects of the Invention] As described in detail above, the three-dimensional fabric of the present invention is composed of three types of yarn groups, of which any of the circumferential yarns ( _yθ ) wound in multiple layers along the circumferential direction of the fabric. a circumferential thread layers (y _theta) orthogonal to the circumferential direction yarns in a state (y _theta) number of radial yarns inserted only continuously in the axial direction and the radial direction so as involving meanders (y _rz) Since the radial direction yarn (y _rz ) is inserted into the circumferential direction yarn (y _θ ) and the turning position is changed, the radial direction yarn density in the outer peripheral portion is the same as that in the inner peripheral portion. In addition to the above, it is possible to change the materials of the three types of threads or the shape of the fabric in various ways.

Further, in the three-dimensional woven fabric of the present invention, the axial thread (z) and the circumferential thread (y _θ ) are tightened only with the radial thread (y _rz ) without using the Kannuki thread, and the radial thread (y _rz ) is used. Since (y _rz ) is continuously inserted in the meandering state in the axial direction and the radial direction so that only the circumferential yarn (y _θ ) is wound, continuous and rapid automatic production is possible.

Further, in the manufacturing method according to the second aspect, the axial thread (z), the radial thread (y _rz ) and the circumferential thread (y _θ ) can be produced without using a jig such as a rod or a thread guide tube. Since the three kinds of yarns are continuously inserted in the axial direction, the radial direction and the circumferential direction, the productivity is improved and the automation is facilitated. Further, by changing the folding position in the radial direction of the radial thread (y _rz ) to a desired position, the meandering state of the radial thread (y _rz ) and the circumferential thread arranged between the threads of the radial component It is possible to easily change the number of steps of (y _θ ) and to weave three-dimensional woven fabrics having various weaving structures, and to cope with various material designs. Furthermore, by changing the number of layers of the circumferential yarns (y _θ ) in the same number of stages, it becomes possible to manufacture a three-dimensional woven fabric whose diameter changes in the axial direction, and the usage of the three-dimensional woven fabric is widened. These woven fabrics can be used not only as a constituent element of a composite material together with a resin or an inorganic substance, but also as a woven fabric itself for applications such as excess material by utilizing a fiber structure constituted in multiple layers.

[Brief description of drawings]

1 to 7 show one embodiment embodying the present invention. FIG. 1 is a sectional view of a three-dimensional fabric, FIG. 2 is a sectional view taken along line XX of FIG. 1, and FIG. The figure is a cross-sectional view taken along the line YY of FIG.
FIG. 4 is a sectional view taken along line ZZ in FIG. 1 (both are shown on one side only), and FIG. 5 is a partially cutaway schematic front view of a three-dimensional loom, and FIG.
The figure is a sectional view taken along the line AA in FIG. 5, and FIGS. 7 (a1) to (s1) are schematic diagrams showing the weaving action corresponding to the section taken along the line XX in FIG. 1, and FIG. 7 (a2). (S2) is a schematic view showing the weaving action corresponding to the section taken along the line YY of FIG. 1, FIG. 8 is a sectional view of the three-dimensional fabric of the second embodiment, and FIG. 9 is PP of FIG. Line cross section,
FIG. 10 is a sectional view taken along the line Q-Q in FIG. 8, FIGS. 11 and 12 are sectional views of a modified three-dimensional fabric, FIG. 13 is a schematic diagram showing a conventional weaving method, and FIG. 14 is another. Plan view showing the conventional weaving method of
FIG. 15 is a partial sectional view of the same. Thread fixing table 1, bobbin holder 6, holder support 7,1
3, a yarn fixing table 8 as a yarn support, a circumferential yarn supplying section 15, a circumferential yarn bobbin 17, a bobbin B, an axial yarn z, a radial yarn y _rz , a circumferential yarn y _θ , and a three-dimensional fabric F.

Continuation of front page (56) References JP-A 61-207657 (JP, A) JP-A 60-194145 (JP, A) JP-A 2-229241 (JP, A)

Claims (2)

[Claims] 1. A large number of axial threads (z) arranged in a multilayer state in a radial direction from a central portion and extending along the axial direction, and inserted between layers of the axial threads (z) along the circumferential direction thereof. the circumferential yarn (y _theta), any interlayer circumferential direction yarns (y _theta) the circumferential yarn in a state that is orthogonal to the circumferential direction yarns in the cross section including the axis (y _θ) (y θ) so as to involve only the A three-dimensional fabric composed of a plurality of radial threads (y _rz ) inserted in a meandering state continuously in the axial and radial directions. 2. An axial thread (z) extending in the axial direction in the center of the fabric is stretched between two thread supports, and a large number of remaining axial threads (z) and radial threads (y). _rz ) are arranged radially from the predetermined center so as to form a multi-layered state on the yarn support, and the ends of the circumferential yarn (y _θ ) are fixed near the center of the fabric, and each layer is One of the layers is formed by winding the circumferential thread (y _θ ) so as to press the layer from the outside of the axial thread (z) and the radial thread (y _rz ) to be formed in the center part.
For each layer, the corresponding axial thread (z) and radial thread (y _rz ) are moved in the axial direction while maintaining the radial position, thereby changing the opening position and winding the circumferential thread (y _θ ) The direction thread (y _rz ) is arranged along the axial direction for a predetermined length and then bent in a direction orthogonal to the axial thread (z), and a part of the circumferential thread (y _θ ) is selected by selecting the opening position. The layers are arranged linearly so as to extend again along the axial thread (z), and the remaining portion is arranged in the radial direction without being wound from the outside of the circumferential thread (y _θ ) and woven in a meandering state. A method for producing a three-dimensional fabric in which the circumferential yarn (y _θ ) is wound by changing the opening position of the radial yarn (y _rz ).