Method for manufacturing solid structural material and foundation fabric therefor

Abstract: The present invention manufactures a solid structural material using a three-dimensional five-axial woven fabric W. According to the present invention, in weaving a three-dimensional five-axial woven fabric W using a three-dimensional weaving machine, divisibly woven sections S1 are formed in portions of a manufactured three-dimensional five-axial woven fabric by alternately driving an upper and a lower insertion members 2, 3 for inserting a vertical yarn Z from above and below, respectively, in such a manner that each of the insertion members and a weft insertion rapier are driven with different timings.

Description: Field of the Invention The present invention relates to a method for manufacturing a solid structural material using a three-dimensional five-axial woven fabric and a foundation fabric for use in this method. Background of the Invention Three-dimensional weaving machines for weaving three-dimensional five-axial woven fabrics are well known. These weaving machines are described, for example, in Japanese Patent Application Laid Open (Tokkai-Hei) No. 3-76845, Japanese Patent Application Laid Open (Tokkai-Hei) No. 4-11043, and Japanese Patent Application Laid Open (Tokkai-Hei) No. 5-106140. As described in each of the publications, the three-dimensional weaving machine guides warps and bias yarns to a cloth fell and inserts vertical yarns into the cloth fell from above or below a yarn layer. Further, a weft insertion rapier inserts wefts into the yarn layer to allow the vertical yarns to connect the warps, the wefts, and the bias yarns together, thereby manufacturing a three-dimensional five-axial woven fabric. Such three-dimensional five-axial woven fabrics are expected to be applied to various fields in the future. The present invention is provided to expand the application of three-dimensional five-axial woven fabrics, and it is an object thereof to manufacture a solid structural material using a three-dimensional five-axial woven fabric. Summary of the Invention The present invention is characterized in that in weaving a three-dimensional five-axial woven fabric using a three-dimensional weaving machine, a solid structural material is manufactured by alternately driving upper and lower insertion members for inserting vertical yarns from above and below, respectively, in such a manner that each of the insertion members and a weft insertion rapier are driven with different timings, thereby forming divisibly woven sections in portions of a manufactured three-dimensional five-axial woven fabric. The divisibly woven sections can be formed in a longitudinal direction of the three-dimensional five-axial woven fabric by selectively driving each of the insertion members in a cross direction of the three-dimensional five-axial woven fabric in such a manner that a particular insertion member and the weft insertion rapier are driven with different timings. The present invention also provides a foundation fabric for use in manufacturing a solid structural material, comprising a three-dimensional five-axial woven fabric having a divisibly woven sections in portions thereof. Brief Description of the Drawing Figure 1 is an explanatory drawing showing an embodiment of the present invention. Figure 2 is an explanatory drawing showing a weaving step carried out by the three-dimensional weaving machine in Figure 1. Figure 3 is an explanatory drawing showing a step following the one in Figure 2. Figure 4 is an explanatory drawing showing a step following the one in Figure 3. Figure 5 is an explanatory drawing showing a step following the one in Figure 4. Figure 6 is an explanatory drawing showing a step following the one in Figure 5. Figure 7 is an explanatory drawing showing a step following the one in Figure 6. Figure 8 is a perspective view of the three-dimensional five-axial woven fabric in Figure 1. Figure 9 is a perspective view showing a state in which the three-dimensional five-axial woven fabric in Figure 8 is cut open. Figure 10 is a perspective view showing a manufactured I beam. Figure 11 is a perspective view showing another embodiment. Figure 12 is an explanatory drawing showing a manufactured hexagonal structural material. Figure 13 is an explanatory drawing showing a manufactured honeycomb structural material. Figure 14 is an explanatory drawing showing another honeycomb structural material. Detailed Description of the Preferred Embodiments An embodiment of the present invention will be described below Figure 1 shows a three-dimensional weaving machine for weaving a three-dimensional five-axial woven fabric W. As in conventional three-dimensional weaving machines, in this three-dimensional weaving machine, warps X and bias yarns B1, B2 pass through a bias yarn orientation device and is then guided to a cloth fell 1, where the warps X are formed into a plurality of yarn sublayers. Further, the bias yarns B1, B2 are formed into sets of two yarn sublayers each in such a manner that these yarn layers are located at opposite sides of the layers of the warps X. In each of these sets of two yarn sublayers each, the bias yarn orientation device operates the bias yarns B1, B2 to incline the bias yarn B1 in one of the two sublayers through +45 dgrees relative to the warps X, while inclining the bias yarn B2 in the other sublayer through -45 dgrees relative to the warps X, as in the conventional three-dimensional weaving machine. Furthermore, according to this three-dimensional weaving machine, a weft insertion rapier inserts wefts Y, and in connection with this insertion, a vertical yarn Z is inserted into each of the yarn layer of the warp X and bias yarns B1, B2 from above or below it. According to this embodiment, a plurality of plate-like upper insertion members 2 are used to insert the vertical yarns Z from above the yarn layer and are each arranged in a cross direction of the three-dimensional five-axial woven fabric W so that the plurality of vertical yarns Z can be guided to each insertion member 2. Likewise, a plurality of plate-like lower insertion members 3 are used to insert the vertical yarns Z from below the yarn layer and are each arranged in a cross direction of the three-dimensional five-axial woven fabric W so that the plurality of vertical yarns Z can be guided to each insertion member 3. The upper and lower insertion members 2, 3 are alternately driven in such a manner that each of the insertion members 2, 3 and the weft insertion rapier are driven with different timings, thereby forming divisibly woven sections S1 in portions of the manufactured three-dimensional five-axial woven fabric W. For example, as shown in Figure 8, a plurality of divisibly woven sections S1 are formed in the cross direction of the three-dimensional five-axial woven fabric W, and the divisibly woven sections S1 and integrally woven sections S2 are alternately formed in a longitudinal direction of the three-dimensional five-axial woven fabric W. The details will be explained below. Before insertion of the vertical yarns Z, the weft insertion rapier is driven to insert each of two wefts Y into the outside of the corresponding yarn sublayer of the bias-yarns B1, B2. Then, as shown in Figure 2, in each yarn layer, the upper insertion member 2 passes between the bias yarns B1 and B2, between the warps X, and then between the bias yarns B1 and B2 and then lowers to insert the vertical yarn Z from above the yarn layer. Further, as shown in Figure 3, the upper insertion member 2 moves toward the cloth fell 1 and then beating is done by the upper insertion member 2. Subsequently, as shown in Figure 4, the upper insertion member 2 recedes from the cloth fell 1, and one weft Y is inserted between the yarn sublayers of the warps X. Subsequently, as shown in Figure 5, the upper insertion member 2 moves toward the cloth fell 1, and subsequently beating is done by the upper insertion member 2, and then the upper insertion member 2 moves upward from the yarn layer. Then, the upper insertion member 2 is removed from the yarn layer. Thus, the vertical yarn Z crosses the weft Y in the upper part of the yarn layer, and the vertical yarn Z crosses the weft Y between the yarn sublayers of the warps X so as to connect the wefts Y together. Further, simultaneously with the elevation of the upper insertion member 2 from the yarn layer, in each yarn layer, the lower insertion member 3 passes between the bias yarns B1 and B2, between the warps X, and then between the bias yarns B1 and B2 and then elevates to insert the vertical yarn Z from below the yarn layer. Further, as shown in Figure 6, the lower insertion member 3 moves toward the cloth fell 1 and then beating is done by the lower insertion member 3. Subsequently, as shown in Figure 7, the lower insertion member 3 recedes from the cloth fell 1, and one weft Y is inserted between the yarn sublayers of the warps X. Subsequently, similarly to the upper insertion member 2, the lower insertion member 3 moves toward the cloth fell 1, and subsequently beating is done by the lower insertion member 3, and then moves downward from the yarn sublayer of the bias layers. Then, the lower insertion member 3 is removed from the yarn layer. Thus, the vertical yarn Z crosses the weft Y in the lower part of the yarn layer, and the vertical yarn Z crosses the weft Y between the yarn sublayers of the warps X so as to connect the wefts Y together. Subsequently, two wefts Y are each inserted into the outside of the corresponding yarn sublayer of the bias yarns B1, B2, and the upper insertion member 2 lowers again to sequentially repeat a similar process. Consequently, the manufactured three-dimensional five-axial woven fabric W is divided between the yarn sublayers of the warps X, and the divided yarn layers are individually connected together. This process forms the divisibly woven section S1. Further, after formation of the divisibly woven section S1, two wefts Y are each inserted into the outside of the corresponding yarn sublayer of the bias yarns B1, B2, and one weft Y is inserted between the yarn sublayers of the warps X. Subsequently, the upper insertion member 2 lowers, while simultaneously the lower insertion members 3 elevates, and the vertical yarns Z are inserted into the yarn layer from above and below it. Further, the upper and lower insertion members 2, 3 move toward the cloth fell 1, and subsequently beating is done by the upper and lower insertion members 2, 3, and then recede therefrom. Subsequently, two wefts Y are each inserted into the outside of the corresponding yarn sublayer of the bias yarns B1, B2, and one weft Y is inserted between the yarn sublayers of the warps X. The upper and lower insertion members 2, 3 move toward the cloth fell 1, and subsequently beating is done by the upper and lower insertion members 2, 3. Then, the upper insertion member 2 elevates, while simultaneously the lower insertion member 3 lowers, whereby the upper and lower insertion members 2, 3 are removed from the yarn layer. As a result, the vertical yarn Z crosses the weft Y in both the upper and lower parts of the yarn layer so as to connect the wefts Y together. Subsequently, two wefts Y are each inserted into the outside of the corresponding yarn sublayer of the bias yarns B1, B2, and one weft Y is inserted between the yarn sublayers of the warps X. Again, the upper insertion member 2 lowers, while simultaneously the lower insertion member 3 elevates, to sequentially repeat a similar process. This process forms the integrally woven section S2. Accordingly, after the three-dimensional five-axial woven fabric W has been manufactured, the divisibly woven section S1 can be cut open along a center line C to manufacture an I beam. The divisibly woven sections S1 can be formed in a longitudinal direction of the three-dimensional five-axial woven fabric W by selectively driving the insertion members 2, 3 in the cross direction of the three-dimensional five-axial woven fabric W in such a manner that the particular insertion member 2, 3 and the weft insertion rapier are driven with different timings. For example, as shown in Figure 11, a plurality of divisibly woven sections S1 can be formed in the longitudinal direction of the three-dimensional five-axial woven fabric W, while the divisibly woven sections S1 and the integrally woven sections S2 can alternately be formed in the cross direction of the three-dimensional five-axial woven fabric W. To achieve this, the following process can be carried out: The insertion members 2, 3 are selectively driven in the cross direction of the three-dimensional five-axial woven fabric W. In the area of the divisibly woven section S1 in Figure 11, when two wefts Y are each inserted into the outside of the corresponding yarn sublayer of the bias yarns B1, B2, the upper insertion member 2 is lowered toward the yarn layer and the vertical yarn Z is inserted into the yarn layer from above it. Then, after beating and when one weft Y is inserted between the yarn sublayers of the warps X, the upper insertion member 2 is elevated and removed from the yarn layer. Subsequently, when two wefts Y are each inserted into the outside of the corresponding sublayer of the bias yarns B1, B2, the lower insertion member 3 is elevated toward the yarn layer and the vertical yarn Z is inserted thereinto from below it. Then, after beating and when one weft Y is inserted between the yarn sublayers of the warps X, the lower insertion member 3 is lowered and removed from the yarn layer. This process can form the divisibly woven section S1. On the other hand, in the area of the integrally woven section S2 in Figure 11, when two wefts Y are each inserted into the outside of the corresponding yarn sublayer of the bias yarns B1, B2 and one weft Y is inserted between the yarn sublayers of the warps X, the upper insertion member 2 is lowered, while simultaneously the lower insertion member 3 is elevated, to insert the vertical yarn Z into the yarn layer from above or below it. Then, after beating, two wefts Y are each inserted into the outside of the corresponding sublayer of the bias yarns B1, B2, and one weft Y is inserted between the yarn sublayers of the warps X. Then, after beating, the insertion member 2 is elevated and the insertion member 3 is lowered in a fashion being removed from the yarn layer. This process can form the integrally woven section S2. Accordingly, the divisibly woven section S1 in Figure 11 can be cut open along the center line C to manufacture the I beam. In addition to the I beam, other solid structural materials can be manufactured using the divisibly woven section S1 and the integrally woven section S2. For example, a hexagonal structural material can be manufactured using the divisibly woven section S1 and the integrally woven section S2, as shown in Figure 12. A honeycomb structural material can also be manufactured by sticking together the divisibly woven sections S1 of a plurality of hexagonal structural materials in such a manner that the divisibly woven sections S1 are opposed to one another, as shown in Figure 13. A honeycomb structural material can also be manufactured by sticking together the divisibly woven sections S1 and integrally woven sections S2 of a plurality of hexagonal structural materials in such a manner that the divisibly woven sections S1 are opposed to the integrally woven sections S2, as shown in Figure 14. As described above, according to the present invention, a solid structural material can be manufactured using the three-dimensional five-axial woven fabric W, thereby attaining the intended object.

Claims: A method for manufacturing a solid structural material characterized in that in weaving a three-dimensional five-axial woven fabric using a three-dimensional weaving machine, a solid structural material is manufactured by alternately driving upper and lower insertion members for inserting vertical yarns from above and below, respectively, in such a manner that each of the insertion members and a weft insertion rapier are driven with different timings, thereby forming divisibly woven sections in portions of a manufactured three-dimensional five-axial woven fabric. A method for manufacturing a solid structural material as in Claim 1, characterized in that said divisibly woven sections are formed in a longitudinal direction of the three-dimensional five-axial woven fabric by selectively driving each of the insertion members in a cross direction of the three-dimensional five-axial woven fabric in such a manner that a particular insertion member and the weft insertion rapier are driven with different timings. A foundation fabric for use in manufacturing a solid structural material comprising a three-dimensional five-axial woven fabric characterized by having divisibly woven sections in portions of the three-dimensional five-axial woven fabric.

Inventors: NISHIYAMA SHIGERU, SHINYA MASHIRO, UCHIDA HIROSHI, NISHIYAMA, SHIGERU, SHINYA, MASHIRO, UCHIDA, HIROSHI, NISHIYAMA, SHIGERU, C/O NAGOYA AEROSPACE SYS.WORKS, Shinya, Mashiro, c/o Nagoya Aerospace Sys.Works
Applicants: MITSUBISHI HEAVY IND LTD, MURATA MACHINERY LTD, MITSUBISHI HEAVY INDUSTRIES, LTD., MURATA KIKAI KABUSHIKI KAISHA
Application year: 2000
Main classification: D03D25
IPC codes: D03D41, D03D25