JPS5896523A - Manufacture of fiber reinforced plastic article - Google Patents

Abstract

PURPOSE:To effectively obtain a lightweight, high-strength, and high-rigid ring using a required and minimum quantity of a fiber, by laminating helically a fiber impregnated with a resin onto a disc, further laminating the fiber in the space between the disc and an auxiliary frame plate and onto the circumferential sections thereof, and applying heat and pressure to the laminate to cause it to set. CONSTITUTION:The fibre 3 such as a carbon fiber is withdrawn from a bobbin 4, is impregnated with the thermosetting resin 6, and is helically wound on the surafce of the circular mandrels 8 through an eye 7 of a traverser to be laminated thereon in a required thickness. Then the auxiliary frame plate 9 is arranged to be spaced at a prescribed interval from the circular mandrel 8 and the fiber 3 is wound into the space therebetween in a direction of the hoop, and after standing until the resin is semi-hardened, only the auxiliary frame plate 9 is removed. Then the fiber 3 is wound on the laminated fiber on the outer circumference of the circular mandrel 8 in the direction of the hoop and in a helical direction to be formed into a laminate. The laminate is removed from the filament winding apparatus, is introduced into a mold 10, and is heated under pressure to be set so that an ring having a L-shape in cross section is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a ring-shaped fiber-reinforced plastic product having an L-shaped cross-section.

Conventionally, as shown in FIG. 1, a ring having a cross-sectional shape consisting of a cylindrical portion 1 and a disk portion 2 reinforced radially inward from the lower end of the cylindrical portion has been manufactured as shown in FIG. A method in which a woven fabric made of fibers orthogonal in the vertical and horizontal directions is impregnated with epoxy resin, polyester resin, etc., and the disk portion 2& is laminated into a ring mold, and then heated and pressurized in an autoclave or press. As shown in Fig. 3, the fibers are aligned in one direction, impregnated with resin, heated and dried to make the resin semi-hardened, and the disk part 2b is laminated into a ring mold and heated in the same manner as in the above method. A method of applying pressure is generally used.

In the above manufacturing method, as shown in FIG.
Continuing the fiber threads in the circumferential direction of the disc part 2, which is provided in the radial direction of the disc part 2, is extremely time-consuming.
0 In order to ensure strength and rigidity in the circumferential direction, it is necessary to increase the wall thickness, so it has been difficult to effectively manufacture an ultra-lightweight, high-strength, and high-rigidity ring. .

This invention was made in order to eliminate the above-mentioned drawbacks of the conventional ones, and it involves laminating fiber threads impregnated with resin on a disk mandrel in a helical direction using a filament winding device, and then stacking them on a disk mandrel at a predetermined gap. An auxiliary frame plate is placed across the gap, and the fiber yarn is inserted into this gap.
By wrapping the fiber threads in the ring direction, and then laminating them on the outer circumference of the ring mandrel and hardening them, the fiber threads are continuous in the circumferential direction of the ring disc part, and the fiber threads are made with the minimum necessary amount. The object of the present invention is to provide a method for manufacturing a fiber-reinforced plastic product, which produces a lightweight, high-strength, and high-rigidity ring.

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

Figure 4 shows the process of helically winding (diagonally winding) a fiber thread impregnated with resin onto a disc mandrel by the filament winding method. First, a fiber thread 3 such as carbon fiber is pulled out from the bobbin 4. This fiber thread 3 is impregnated with a thermosetting resin 6 such as an epoxy resin in a resin bath 5, and the amount of resin deposited is suitable for adjusting the fiber content and expelling air bubbles.

While controlling the tension etc., helical winding is carried out on the surface of the disk mandrel 8 through the large eye 7 of the traverser to form a lamination of the required thickness. Next, an auxiliary frame plate 9 is placed on the disc mandrel 8 with a predetermined gap therebetween as shown in FIG. Wrap it around. Thereafter, the resin is left until it becomes a semi-hardened state, and when the fiber threads 3 become unraveled, only the auxiliary frame plate 9 is removed, and the fiber threads 3 impregnated with the resin 6 are placed on the disk mandrel 8 as shown in FIG. The fiber yarns are laminated in the hoop direction and the helical direction from above the fiber yarns that were previously laminated on the outer periphery of the fiber yarn. In the next step, the fiber yarn, that is, the composition laminated on the disk mandrel 8 is removed from the filament winding device, placed in a mold 10 as shown in FIG. Rings with a 5-shaped cross section can be manufactured. Figure 8 shows the finished product completed through the above steps.

In addition, although the case where the ring is circular has been described in the embodiment, rings of various shapes can be manufactured by using a mandrel having a triangular, quadrangular, or other shape.

As described above, according to the present invention, the fiber threads can be continuously arranged in the circumferential direction of the ring disc portion, so it is possible to design a ring with an L-shaped cross section using a minimum number of fiber threads. , it is possible to manufacture ultra-lightweight, high-strength, and high-rigidity rings. Further, it has the effect of fully exhibiting the uniformity of fiber tension, control of fiber content, and economic efficiency associated with automation, which are common to the filament winding method.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway perspective view of a ring having an L-shaped cross section. 2 and 3 are partially cutaway perspective views showing conventional rings formed by laminating and molding woven fabrics, and FIGS. 4 to 8 show the manufacturing method according to the present invention. FIG. A perspective view of laminating yarns. Fig. 5 is an explanatory diagram showing the lamination of fiber yarns between the disc mandrel and the auxiliary frame plate, Fig. 6 is a cross-sectional view of the fiber threads laminated on the outer periphery of the disc mandrel, and Fig. 7 is a diagram showing the fiber threads laminated on the outer periphery of the disc mandrel. FIG. 8 is a cross-sectional view of the finished product, showing the yarn being pressurized and heated to harden using a mold. l... Cylindrical part, 2... Disc part, 3... Fiber thread, 5
...Bobbin, 6...Resin, 7...Large traverser, 8...Disc mandrel, 9...Auxiliary frame board, 10
...Molding mold, 11...Press machine. In addition, in the figures, the same reference numerals indicate the same or equivalent parts. Agent Shin Kuzuno - Figure 1 Figure 3 Figure 6

Claims (1)

[Claims] A method for manufacturing a ring-shaped fiber-reinforced plastic product having an L-shaped cross-section, in which resin-impregnated fiber threads are laminated in a helical direction on a disk using a filament winding device, and then the disk is laminated with a predetermined gap. An auxiliary frame plate is provided across the disk, the fiber yarn is wound in the hoop direction in this gap, and then the fiber yarn is laminated on the outer periphery of the disk and hardened and molded. A method for manufacturing fiber-reinforced plastic products.