JPS6366358A - Three-dimensional weaving apparatus - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an apparatus for manufacturing a three-dimensional fibrous structure.

[Prior art]

As a means of reinforcing metal or plastic molded bodies,
High strength fibers such as carbon fibers, glass fibers or metal fibers are used.

Conventional reinforcing methods for plastic molded bodies include a method of forming an integral structure by laminating so-called prepreg sheets in which reinforcing fibers are laminated in a flat plate shape within a plastic material.
In FRP (fiber reinforced plastics) molded bodies with this structure, it is not possible to use a large amount of fibers in a three-dimensional manner, and the resistance to peeling between fiber layers is weak compared to the amount of fibers filled. However, there is a problem that the reinforcing effect is not very good.

Therefore, a method has been proposed in which a braided string or a braided structure, that is, a three-dimensional fiber structure is formed by expanding the braided string, and is reinforced by embedding it in a metal or plastic material.

A weaving means for forming this three-dimensional fiber structure is described, for example, in US Pat. No. 4,312,261, and this weaving means is called a torsion lace method. In this method, a large number of bobbins are placed in a moving plane, and the yarns wound around the bobbins are unwound and the positions of the bobbins are changed to form a three-dimensional fiber structure due to the intertwining of the yarns. It is.

In addition, a linear motor is constituted by a bobbin carrier having a slider provided on the bottom surface and a stator provided on a movable plane supporting the bobbin carrier, and a device that provides driving force to each bobbin carrier is proposed. The present inventors have developed and already proposed a device that is an improved version of the original weaving device.

As described above, a three-dimensional fiber structure can be manufactured by various means, and using this, plastic or the like can be reinforced three-dimensionally to form FRP.

The three-dimensional fiber structure consists of a fabric in which the warp, weft, and perpendicular threads are not meandering (simply perpendicular to each other (hereinafter referred to as A type)), and a fabric in which the three-component threads are arranged like a normal planar fabric. There is a type (hereinafter referred to as type B) that has a structure in which the two types are mutually dislocated and meandering.

Since the A-type three-dimensional fiber structure has linear doubling yarns, it has the characteristics of easily resisting tensile force and having little deformation. Further, since the movement of the thread during weaving is simple, efficient weaving is possible.

However, because the three types of threads intersect perpendicularly to form a three-dimensional fiber structure, it is easy to cause changes in the structure (when filling the gaps between the threads with a matrix material such as resin under high pressure) There is a problem that the body has thread misalignment and the whole body is easily deformed.Also, there is a problem that the warp threads, which reinforce the obtained molded product,
There is a problem in that when a force is applied from a direction different from that of the weft and perpendicular systems, the stress is lower than the stress acting in the yarn direction.

On the other hand, type B three-dimensional fiber structures have good shape retention as a woven fabric, and are characterized by little deformation when filling the voids between the yarns with the matrix material. The latter is more advantageous for use as a reinforcing material, and is also superior in that three-dimensionally balanced stress can be obtained.

However, in the B type three-dimensional fiber structure, since there are many threads arranged diagonally throughout the structure, it is not possible to make the stress in the longitudinal direction of the structure larger than the stress in other directions, for example. There is a problem.

[Purpose of the invention]

The present invention provides a three-dimensional weaving device that can take advantage of the advantageous properties of the B-type three-dimensional fiber structure and solve the problem of relatively low stress in the longitudinal direction.

[Summary of the invention]

To achieve the above object, the present invention provides an apparatus for weaving a three-dimensional fiber structure by moving a plurality of carriers equipped with bobbins in biaxial directions, in which the carrier bends on the moving surface of the carrier. This is a three-dimensional manufacturing device configured to supply yarn to corner portions.

That is, the present invention provides an apparatus for weaving by arranging a large number of bobbin carriers on which bobbins are mounted on a moving plane and moving these bobbin carriers in two wheel directions, a longitudinal direction and a lateral direction, under predetermined conditions. In particular, the yarn is supplied linearly in the longitudinal direction of the three-dimensional fiber structure without hindering the movement of the carrier.

In order to supply the yarn in this straight line, the movement of the bobbin carrier must not be obstructed, and therefore a corner portion on the movement plane where the carrier bends is optimal.

In order to weave a large three-dimensional weaving structure, it is necessary to weave while supplying a large number of threads, but in order to do so, a bobbin that supplies thread in a straight line and a bobbin that moves in two directions, vertically and horizontally, are required. If both are used together, the device will become significantly larger. Therefore, it is actually advantageous to support the movable bobbin and the fixed bobbin on separate support surfaces.

It is advantageous for a device having the above structure that the plane of movement of the bobbin carrier is located on the upper side, and the support surface on which the fixed bobbin is placed below the plane of movement is formed in the shape of a double-sided bow. In this device, if the fixed bobbin is simply placed below the moving plane, there is a possibility that the bobbin replacement operation will be hindered.

Therefore, it is preferable to install a fixed bobbin on a movable carriage, and to move the entire movable bobbin below the movement plane of the bobbin carrier.

〔Example〕

Next, the present invention will be described in detail with reference to the drawings.

Figure 1 is a side view showing the schematic structure of the three-dimensional weaving device;
The figure is a plan view showing a bobbin carrier and a thread guide tube supported on a moving plane.

The three-dimensional weaving device M has a bobbin carrier 2 on a moving plane l.
is supported movably vertically and horizontally, and a bobbin (package) 3 is mounted on this bobbin carrier 2.

As the means for driving the bobbin carrier 2, for example, the means described in the above-mentioned US Pat. No. 4,312,261 and other documents are applied. Further, as described above, a linear motor can be configured by a bobbin carrier with a slider provided on the bottom surface and a stator provided on a moving plane that supports the bobbin carrier, and this can be used as a driving means for each bobbin carrier 2. .

A space 5 is provided below the support base 4 that supports the slider surface 1.
is formed, and a fixed bobbin 3a is arranged within this space 5.

A thread guide tube 6 is provided vertically passing through the support base 4, and the thread guide tube 6 is disposed at a position where it does not obstruct movement of the bobbin carrier 2.

During the weaving operation, for example, the bobbin carrier 2a is
, 2c, 2d...2h... to weave a three-dimensional fiber structure, and this bobbin carrier 2
A thread guide tube 6 is provided at a position away from the movement path.

Bobbin 3 on bobbin carrier 2 moving on slider surface 1
As illustrated above, the yarn 8 that is unwound is woven while moving in a zigzag manner according to the configuration of the three-dimensional fiber structure 9, and the yarn 8a that is unwound from the fixed bobbin 3a is guided by the yarn guide 6. The fabric is woven while being unwound to form a three-dimensional fiber structure 9, which is then taken off by a take-off roller 10.

FIG. 3 shows the warp 11 of the three-dimensional fiber structure. It is a figure of the said A type textile fabric which comprised the weft 12 and the perpendicular|vertical system 13 to orthogonal structure.

Figure 4 shows a fabric woven by the torsion lace method.
That is, this is a diagram showing a three-dimensional fiber structure woven by the bobbin carrier 2 moving in two axial directions on the moving plane 1 in the weaving apparatus according to the present invention shown in FIGS. 1 and 2. This is a type B fabric in which the threads 14 form a diagonal weave.

In this example, 24 bobbin carriers 2 were used for weaving.

FIG. 5 is a diagram showing the cross section 14a and path of each weaving thread 14 when the three-dimensional fiber structure of FIG. 4 is cut.

FIG. 6 is a cutaway view of a three-dimensional fiber structure obtained by the weaving apparatus according to the present invention, and is shown in comparison with FIG. 5.

Yarn 14 unwound from the moving bobbin 3 on the bobbin carrier 2 to form a texture. (14a) is disposed diagonally, but the yarn 15 unwound from the fixed bobbin 3a to form a structure is entangled with the diagonal yarn 14 (14a), but there are gaps in each path shown in FIG. It is arranged in a straight line in the portion 14b. In other words, linear threads are arranged within the three-dimensional fiber structure described in the above-mentioned US patent, etc., and the fiber volume content and longitudinal strength of the three-dimensional fiber structure are will be increased by the addition of the straight fibers.

That is, in this example, carbon fiber (manufactured by Toshial, "Torayka T-3")
00"12") are wound around the bobbin 3 moving on the bobbin carrier 2 and the fixed bobbin 3. In the three-dimensional fiber structure, the fiber volume content V is 4
0.8%, the tensile strength in the longitudinal direction was 85 kg/c+J, whereas in the three-dimensional fiber structure of FIG. 6 using the fixed bobbin 3a as in the present invention, the tensile strength was 53. 6%
, the longitudinal tensile strength was significantly improved to 127 kg/cd.

〔Effect of the invention〕

A three-dimensional weaving apparatus according to the present invention is an apparatus for weaving a three-dimensional fiber structure by moving a plurality of carriers each carrying a bobbin in the two-wheel direction, and in which a part on a moving surface of the carrier and a bending corner portion of the carrier is provided. Since the structure is such that the thread is supplied to the machine, the following effects can be achieved.

[1] The three-dimensional fiber structure is particularly reinforced in the longitudinal direction by the yarn supplied from the fixed bobbin, and a structure with relatively high strength also in the three-dimensional direction can be obtained.

(2) Since the threads supplied from the fixed bobbin are added to the voids in the diagonal weave, the fiber volume content is ■.

A large three-dimensional fiber structure can be obtained.

(3) It is possible to obtain a three-dimensional fiber structure having a structure with different fiber orientations that share the diagonal direction and the axial direction, which cannot be obtained with conventional weaving equipment.

[Brief explanation of the drawing]

FIG. 1 is a side view schematically showing a three-dimensional weaving apparatus according to an embodiment of the present invention, and FIG. 2 is a plan view thereof. Fig. 3 is an enlarged perspective view of the fabric of A 1 that constitutes an orthogonal weave, Fig. 4 is an enlarged perspective view showing a three-dimensional fiber structure woven only by a moving bobbin, and Fig. FIG. 6 is a cross-sectional plan view of the original fiber structure, and FIG. 6 is an enlarged cross-sectional plan view showing the cross section of the three-dimensional fiber structure obtained by the present invention, and is an explanatory diagram compared with FIG. 5. 1...Moving plane, 2...Bobbin carrier, 3...
Bobbin (package), 3a...Fixed bobbin, 4...
- Support stand, 5... Space, 6... Thread guide tube, 8,
8a... Yarn, 9... Three-dimensional fiber structure, 11...
Warp, 12... Weft, 13... Vertical system.

Claims (1)

[Claims] A device for weaving a three-dimensional fiber structure by moving a plurality of carriers carrying bobbins in biaxial directions, the device being configured to supply yarn to a bending corner portion of the carriers on the moving surface of the carriers. A three-dimensional weaving device.