JPH0511024B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing a fiber-reinforced resin structure, and particularly to a method for manufacturing a structure having a complicated spatial structure.

[Conventional technology]

A fiber-reinforced resin structure is a long filamentous fiber-reinforced material such as thread or string (roving) impregnated with a resin liquid, which is wound around a winding form or jig to a predetermined thickness, cured, and then removed. Since it can be molded into one-dimensional or three-dimensional structures with a wide variety of design freedom, it is being developed as a large-scale structure.

An example of a method for manufacturing such a structure is the method described in British Patent Publication No. 2103572A. In this method, a plurality of plate ends (partition plates) forming the outer shape of the structure are connected by a shaft that passes through a hole provided in the center, and both ends are connected with a mandrel between them. Since the structure is connected to the end bead supported by the mandrel, the shape of the resulting spatial structure becomes linear.

[Problem that the invention seeks to solve]

The problem faced by the present invention is to provide a method in which a fiber-reinforced resin structure having a complex shape can be manufactured by freely positioning the plate ends.

[Specific measures to solve the problem]

For this reason, the present inventors arranged the support jigs at positions corresponding to the bending points of the axes of the desired shape and fixed them to each other, and then attached the plate end with three or more recesses on the peripheral edge to the support jigs. The space structure of the desired shape was obtained by inserting it into the recess of the tool, then winding a resin-impregnated continuous fiber thread or string around the recess of the plate end, and removing it from the mold after hardening.

[Effect]

To carry out the method of the present invention, a support jig having one recess is placed at a bending point on the axis of the desired shape, and a plate end having a center hole is inserted into the recess of the support jig. Although it is possible to fix the plate ends to each other by inserting a shaft, in practice, a support jig having the same shape as the axis of the structure as shown in Fig. 1-○A is integrally molded, and the axis is fixed. By inserting the plate end into the recess provided at the bending point, the plate end is fixed and there is no need to use a shaft.

On the other hand, the cross-sectional shape of the structure can be adjusted by adjusting the number of recesses around the plate end. In this way, the shape of the support jig, the length of the shaft,
The shape of the spatial structure can be freely adjusted by adjusting the number of recesses in the plate end.

Carbon fibers, glass fibers, etc. can be used as the filamentous fibers used in the present invention. For example, carbon fibers have a thickness of about 7 μm, and glass fibers have a thickness of about 7 μm.
A thread (roving) consisting of 2,000 to 30,000 threads of 13 to 25 μm or a string (roving or yarn) made by twisting or aligning several threads thereof is used. Furthermore, thermosetting resins such as epoxy resins, unsaturated polyester resins, and phenol resins are used as the resins impregnated into these filamentous fibers. The composition of these resin liquids is selected so that when impregnating the fibers, the viscosity is such that it sufficiently spreads over the surface of the fibers but does not run off, and special catalysts or accelerators are added, but they do not harden until the end of winding. Preferably from the beginning. The support jig is removed after curing, but the plate end, shaft, etc. may be left in the structure.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1-A shows the state in which the plate end 2 is placed on the support jig 1. As mentioned above, the support jig 1 is integrally molded along the axis of the structure. The support jig 1 is provided with a pair of recesses 3, 3 at a predetermined interval, and gaps 4a, 4b, 4c.
By inserting a portion of the plate end 2 into..., the plate end 2 is fixed. The plate end 2 in the figure is provided with a center hole 5, but in the case of the support jig 1 of this example, the plate end 2 can be fixed smoothly without using a shaft.
It can withstand the tension of wrapping fibers. Further, as shown in FIG. 1B, a groove 6 may be provided in place of the protrusions 3, 3 to fix the plate end 2.

Recesses 7a, 7b, 7c... are provided at the peripheral edge of the plate end 2 according to the cross-sectional shape of the structure, and by winding resin-impregnated fibers around these recesses 7a, 7b, 7c... It becomes possible to manufacture spatial structures with complex shapes such as molds or loops.

FIGS. 2A to 2C show various shapes of the plate end 2, and the number and shape of the recesses 7a, 7b, 7c, . . . can be arbitrarily determined. That is, Fig. 2-A shows a standard plate end 2 used for manufacturing a structure with a rectangular cross section;
The plate end shown in B is used for manufacturing a structure with a polygonal cross section, and in the plate end 2 shown in FIG. It's like this.

FIG. 3 shows a perspective view of a space structure manufactured using the support jig 1 and plate end 2 shown in FIG. 4. That is, a plate end 2 made of glass fiber reinforced resin with a thickness of 3 to 10 mm has four recesses 7a, 7b, 7c, and 7d on the peripheral edge as shown in FIG. 2-A, but does not have a center hole 5. is inserted into the groove 6 of the support jig 1, and adjusted so that the direction angles of the corresponding recesses 7a, 7b, . . . of each plate end 2 match. Next, according to the winding pattern shown in FIG. 5, starting from the recess (1.0) indicated by the coordinates, the resin-impregnated fiber is secured.

The winding pattern consists of a rectangular wave part and a triangular wave part, where the rectangular wave part shows the winding order on the outer periphery, and the triangular wave part shows the winding order in the diagonal direction. Then, the first winding is completed with the sequence consisting of the initial rectangular wave and the triangular wave, and then the sequence is reversed to perform the second winding. By winding the material 2 to 12 times in this manner, a spatial structure as shown in FIG. 3 is obtained.

After winding is completed, the supporting jig 1 is removed, but the plate end 2 is not removed, and is cured at room temperature for several hours, and then post-cured in an oven to obtain a fiber-reinforced resin structure with sufficient strength. Note that the plate end 2 remains in the structure even after the post-curing process.

〔Effect of the invention〕

As described above, in the present invention, even a complexly curved structure can be efficiently manufactured by arranging the plate ends along a desired axis. Further, the plate end, shaft, etc. may be left in the structure, which has the effect of increasing the strength of the structure.

[Brief explanation of the drawing]

Figure 1-○A represents a perspective view of an example of a support jig, Figure 1-○B represents a perspective view of another support jig, and Figure 2-○A shows a plate having four recesses. Figure 2 - ○ represents a front view of the plate end having eight recesses;
Figure ○C shows a front view of a plate end having a deep recess, Fig. 3 shows a perspective view of the spatial structure obtained in the example, and Fig. 4 shows the support jig and A perspective view of the plate end is shown, and FIG. 5 shows a winding pattern diagram around the plate end shown in FIG. In the figure, 1...Support jig, 2...Plate end, 3...Convex portion, 4a, 4b, 4c, 4d...Gap portion, 5...Center hole, 6...Groove portion, 7a, 7b,
7c, 7d... recessed portions.

Claims (1)

[Claims] 1. After placing the support jigs at positions corresponding to the bending points of the axis of the desired shape and fixing them to each other, place a plate end (partition plate) with three or more recesses on the periphery of the support jig above. A method for manufacturing a fiber-reinforced resin structure, which comprises inserting the structure into the recess of the plate end, then winding a resin-impregnated continuous fiber thread or string around the recess of the plate end, and removing the mold after curing.