JPH07122194B2 - Manufacturing method of curved tubular fiber structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a spacecraft, an aircraft, an automobile, a railway vehicle,
The present invention relates to a method for manufacturing a curved tubular fiber structural material for strengthening a resin molded product for ships, machinery, buildings and other structural materials.

(Prior Art) As the above-mentioned resin molding for structural materials, carbon fiber, graphite fiber, glass fiber, silicon carbide fiber, alumina fiber, metal fiber, polyester fiber, heat resistance such as aliphatic or aromatic polyamide fiber, A fiber structure made of highly functional fibers with excellent strength and elasticity is impregnated with a matrix resin such as epoxy resin or phenol resin, molded into a desired shape, and then cured to obtain a product. . If the above resin molded product is in the shape of a pipe, a large number of first yarns or warp yarns are arranged in parallel to the length direction, and the plurality of warp yarns are arranged in a plane orthogonal to the warp yarns. There is known a method of forming a cross-sectional layer by passing a second yarn or weft in a meandering manner (JP-A-60-
194145, JP 58-163749, and JP 58.
-220847 gazette). Then, when a pipe curved in an L shape or a U shape is required, conventionally, the tubular fiber structure formed straight as described above is used by being curved. As a method to which the filament winding method is applied, there is known a method in which a yarn made of the above fiber is wound around a curved rod-shaped die to be molded, and then the die is protected.

(Problems to be Solved by the Invention) Conventionally, a straight pipe-shaped fiber structure is curved,
Since a curved tubular fiber structure was made by winding the yarn around a curved rod-shaped mold, the weft yarn arrangement density increases on the inside of the curved portion, but it becomes extremely small on the outside, resulting in uneven yarn density. Was occurring. Since the strength of the structure largely depends on the array density of the reinforcing fibers, when there is a density difference between the inside and outside of the curved portion as described above, the shape of the curved portion becomes unstable and deforms, The fiber arrangement is disturbed and the strength of the resin molded product is lowered, which is a problem.

According to the present invention, the arrangement density of the weft threads forming the cross-section layer is substantially uniform in each of the inside, outside, and straight portions of the curved portion, the fiber arrangement is not disturbed, and the shape is stable and difficult to deform. It is intended to provide a method for producing a curved tubular fiber structure which can be easily impregnated with and has no deterioration or variation in strength at the curved portion.

(Means for Solving Problems) A large number of guide pipes are detachably erected along a closed curve on the base plate, and the weft yarns are zigzag-shaped by the multiple guide pipes while the weft yarns are guided by the guides. A lower tubular portion consisting of an annular weft layer that extends over the entire guide pipe by laminating it along all or part of the pipe, and an arcuate weft thread that lacks a part of the weft yarn of the annular weft layer. Forming an intermediate tubular part consisting of only one layer or a mixture of this arcuate weft layer and the above-mentioned annular weft layer and an upper tubular part consisting of the above-mentioned annular weft layer, and then replacing the above-mentioned guide pipe with a warp thread The tubular laminate comprising the lower tubular portion, the intermediate tubular portion and the upper tubular portion is compressed along the warp yarn to form the tubular laminate in the weft yarn of the arcuate weft layer in the intermediate tubular portion. Bend so that the central part is on the outside.

(Operation) By arranging the bow-shaped weft yarn layers in the intermediate tubular portion, the weft yarn density on the side where the bow-shaped weft yarn layer is located in the intermediate tubular portion becomes substantially equal to the weft yarn densities of the upper tubular portion and the lower tubular portion, On the opposite side, the weft yarn layer lacked the weft yarn and the weft yarn density became coarse, so the guide pipe was replaced with the warp yarn, and the tubular laminate consisting of the lower tubular portion, the intermediate tubular portion and the upper tubular portion was compressed along the warp yarn. In this case, in the middle tubular part, the central part of the weft thread of the arcuate weft thread layer is on the outside,
The opposite side is curved so that the side where the weft threads are absent is inward, and the weft thread densities inside and outside the curved portion are substantially equal. Then, depending on whether the intermediate tubular portion is formed by only the bow-shaped weft layer or by mixing the bow-shaped weft layer and the annular weft layer, the degree of mixing, the size of the bow-shaped weft layer, the stacking height, etc. Therefore, the curvature of the curvature is determined.

(Example) In FIG. 1, 1 is a base plate, 2 is a guide pipe,
The guide pipe 2 has a thickness that allows the warp threads of the curved tubular fiber structure to be inserted, and a length that is equal to or greater than the height of the tubular laminate obtained by laminating the weft threads, so that a desired tubular body shape is formed. As shown in FIG. In addition, the guide pipe 2 on the front side is shown by being crushed for the sake of convenience. Further, the guide pipes 2 can be easily attached and detached by inserting them into holes formed in the base plate 1 or by fitting them into pins implanted in the base plate 1. .

While weaving the weft threads 3 through the guide pipes 2 arranged in a circle, the spiral threads are laminated to a desired height (see FIG. 2). However, the upper and lower two weft threads 3, which are adjacent to each other,
When the number of guide pipes 2 is an even number, the two weft threads 3 and 3 are inserted so that their directions are alternately changed so that 3 intersect.
In this way, the total number of guide pipes 2
The annular weft thread layer 3a is formed every time the circumference is formed, and the lower tubular portion 4 consisting of only the annular weft thread layer 3a is formed by repeating the cycle. Next, the intermediate weft layer 3 is formed by alternately laminating the arcuate weft layers 3b and 3c lacking a part of the annular weft layer 3a and the annular weft layer 3a. However, bow-shaped weft layer
In 3b and 3c, the weft thread 3 is folded back so as to wind around the end guide pipe 2. Then, similarly to the lower tubular portion 4 described above, the upper tubular portion 6 composed of only the annular weft layer 3a is formed.

After the tubular laminate 7 including the lower tubular portion 4, the intermediate tubular portion 5 and the upper tubular portion 6 is formed on the base plate 1 as described above,
Pull out one guide pipe 2 upward from the base plate 1 (3rd
(See the drawing), the warp thread 8 is inserted into the guide pipe 2 from below, and the guide pipe 2 is pulled out to replace the guide pipe 2 with the warp thread 8. The upward protruding end of the warp thread 8 is adjacent to the adjacent guide pipe 2. This guide pipe 2 is pulled out downwards, and this is repeated to replace all the guide pipes 2 with warp yarns 8. As shown in FIG. 4, one warp yarn 8 is attached to the tubular laminated body 7. Insert it all around while reciprocating up and down. Next, when both ends of the warp thread 8 protruding downward of the tubular laminated body 7 are squeezed, the weft thread lacking portion 5a of the intermediate tubular portion 5 is compressed up and down, and the tubular laminate 7 makes the weft thread lacking portion 5a inside. The curved tubular fibrous structure 9 is obtained as shown in FIG.

Instead of inserting the end portion of the warp thread 8 into the guide pipe 2 of FIG. 3, the folded back end of the warp thread 8 is inserted, and the folded back end of the warp thread 8 is projected from the guide pipe 2 in a loop shape (6th
(Refer to the drawing), the loop-back loops 8a of the warp threads 8 are successively inserted to connect the loop-back loops 8a to each other, and the tubular warp threads 8 and 10 are tightened to bend the tubular laminate 7.

In the above embodiment, the intermediate tubular portion 5 is formed by mixing the annular weft layer 3a and the arcuate weft layers 3b and 3c, but the annular weft layer 3a may be omitted. FIG. 7 shows an example of this, in which only four types of bow-shaped weft layers 3d, 3e, 3f, 3g having a larger missing area are laminated on the intermediate tubular portion 5, and the upper and lower tubular portions 4, 6 are formed inside the curved portion. The end portions of are contacted with each other.

FIG. 8 shows that the guide pipes 2 are arranged in two rows inside and outside.
A weft thread 3A is laid in a meandering shape across the guide pipes in a row, and after one round, another weft thread 3B is made circular between the inner row and the outer row of the guide pipe 2 without intersecting with the guide pipe 2. Insert, and then again weft thread as in the beginning
3C is laminated in a meandering shape over the two rows of guide pipes 2, but with a phase difference from the front, and an annular weft layer
3a is formed. However, the bow-shaped weft thread layers 3b to 3g of the intermediate tubular portion 5 are formed by folding back the meandering weft thread 3A halfway,
It is formed by crawling in an arc shape between the inner row and the outer row of the guide pipes 2 and then folding back again in the middle to meander. In this case, since the warp yarns 8 are arranged in two rows inside and outside, the strength is further improved.

Further, FIG. 9 shows that the weft thread 3A is laid in a meandering manner across the guide pipes 2 in the inner and outer rows, and then the weft thread 3B is laid in a meandering manner only in the outer row of the guide pipes 2, and then the woven thread 3B is laid again. The weft thread 3C straddles the guide pipes 2 in the row and crawls with the phase shifted, and then again, the weft thread 3D only in the outer row of the guide pipes 2 changes the phase and crawls in a meandering manner.
A wide cross-sectional layer 3a is formed. However, in the intermediate tubular portion 5, as in the example of FIG. 8, one weft thread 3 is laid up and appropriately folded back in the middle to form an arcuate weft thread layer. In this case, the outer peripheral density of the cylinder is higher than the inner peripheral density, and the outer peripheral strength after molding is improved.

(Effect of the Invention) According to the present invention, it is possible to obtain a curved tubular fiber structure in which the arrangement density of the weft yarns forming the cross-section layer is substantially uniform in each of the inner side, the outer side and the straight portion of the curved portion. There is no slack or deformation due to elongation of the yarn, the shape is stable, the matrix resin is uniformly impregnated, and the strength of the obtained resin molded product is improved. It is also possible to design the warp and weft arrangements for the desired strength characteristics of the curved tubular fibrous structure.

[Brief description of drawings]

FIG. 1 is a perspective view of an example of an apparatus used for carrying out the present invention, FIG. 2 is a developed view of a tubular laminate, FIG. 3 is a perspective view of a tubular laminate on a base plate, and FIG. 4 shows warp threads. FIG. 5 is a perspective view of the tubular laminated body in the inserted state, FIG. 5 is a front view of an example of the curved tubular fiber structure, FIG. 6 is a perspective view of the tubular laminated body in a warp thread insertion state according to another embodiment, and FIG. FIG. 8 is a front view of another embodiment of the curved tubular fiber structure, and FIGS. 8 and 9 are cross-sectional views of the other embodiment, respectively. 1: base plate, 2: guide pipe, 3, 3A, 3B, 3C, 3D: weft thread, 3a: annular weft thread layer, 3b, 3c, 3d, 3e, 3f, 3g: bow weft thread layer, 4: lower tubular section, 5: Intermediate tubular part, 6: Upper tubular part, 7: Tubular laminated body, 8: Warp yarn, 10: Threading yarn.

Claims (5)

[Claims] 1. A large number of guide pipes are detachably set up along a closed curve on a base plate, and the weft yarns are hung in a zigzag manner on the large number of guide pipes, and the weft yarns are attached to the whole or one of the guide pipes. By laminating along the portion and laminating, a lower tubular portion formed of an annular weft layer extending over the entire guide pipe, and an arcuate weft layer of a shape lacking a part of the weft yarn of the annular weft layer, Alternatively, an intermediate tubular portion formed by mixing the bow-shaped weft yarn layer and the annular weft yarn layer and an upper tubular portion formed of the annular weft yarn layer are sequentially formed, then the guide pipe is replaced with a warp yarn, and the warp yarn is guided along the warp yarn. And compressing the tubular laminated body composed of the lower tubular portion, the intermediate tubular portion and the upper tubular portion so that the tubular laminated body has the weft yarn central portion of the arcuate weft yarn layer in the intermediate tubular portion outside. Preparation songs tubular fiber structure, characterized in that to urchin curved. 2. The method for producing a curved tubular fiber structure according to claim 1, wherein a plurality of types of bow-shaped weft layers having different lengths are mixed and laminated in the intermediate tubular portion. 3. The method for producing a curved tubular fiber structure according to claim 1 or 2, wherein the guide pipes are arranged in a plurality of concentric rows. 4. The curved tubular fiber structure according to any one of claims 1 to 3, wherein the weft yarns of adjacent annular or bow-shaped weft yarn layers are laminated in different directions so as to intersect each other. Manufacturing method. 5. The weft yarns of the annular weft yarn layer are laminated in a spiral shape, and the weft yarns of the arcuate weft yarn layer are folded back by the guide pipes at both ends and laminated.
Item 10. A method for producing a curved tubular fiber structure according to any one of items.