JPH0376820B2 - - Google Patents

Description

Detailed Description of the Invention Purpose of the Invention The present invention relates to a method for manufacturing a tubular body such as a fishing rod by winding a prepreg around a cored metal. The purpose of this is to prevent the decline.

Conventional technology The taper of fishing rods formed by winding conventional prepreg is 0/1000 to 2, which has a small taper ratio of the core metal.
It is normal to gradually change the ratio within a range of 0/1000, and even when manufacturing fishing rods with a steep taper in the middle, the difference in taper ratio is currently less than 15/1000. .

The reason for this is not only that bending stress concentrates at the taper boundary where the taper ratio rapidly changes, reducing the strength, but also that the width of the required number of plies is When winding the prepreg, slips occur in the winding of the prepreg at the boundary of the taper ratio due to the rotation of the core metal during winding, and these slips accumulate continuously with each rotation of the core metal, causing wrinkles in the prepreg. This is because it floats up from the core metal and drips, further reducing the strength of the tapered boundary portion of the tubular body.

For example, when a prepreg C having a width of 3 plies is wrapped around a core B having a steeply tapered portion A as shown in FIG. Slips occur in C, and the core metal B does not stick tightly, causing wrinkles, which further reduce the strength of the manufactured tubular body.

Structure of the Invention The present invention is designed to prevent a decrease in strength when manufacturing a tubular body using such a core metal having a steeply tapered portion in the intermediate portion. A plurality of flip-pregs formed for each ply are wound on gold one layer at a time, and the winding edges of the plurality of prepregs are shifted from each other and wound, and then sequentially taped, heat-cured, and de-cored using conventional methods. The gist is to perform treatment and tape peeling treatment.

To explain the details of the present invention, the core bar 1 is formed to correspond to one ply of a core metal 1 consisting of a gently tapered narrow diameter part a, an intermediate steep taper part b, and a gently tapered large diameter part c. Prep rig 2, 3,
Prepare prepreg 4, first wrap prepreg 2 around core metal 1, then wrap prepreg 3 with the winding start edge shifted, and further wrap prepreg 4 on the outside with the winding start edge shifted. .

Next, this is sequentially subjected to taping, heat curing, core removal, and tape peeling according to conventional methods to produce a tubular body.

However, as the prepregs 2, 3, and 4, as in the past, an aligned sheet of reinforcing fibers such as carbon fibers and glass fibers, or a woven fabric impregnated with a thermosetting synthetic resin is used, and the prepregs are wrapped around the outside. The width of the inner prepreg is 1 to 1.2
It is preferable to make it slightly larger by about twice as much, and for winding, to lay an elastic mat on the winding table (bed) of the core metal.

According to the present invention, the difference in taper ratio in the steeply tapered part can be practically used in the range of 20/1000 to 80/1000, and a large diameter gripping part can be integrally connected to the fishing rod.

Effects of the Invention The present invention manufactures a tubular body by sequentially winding a plurality of prepregs formed for each ply around a core metal having a steeply tapered portion in the middle, and shifting the winding edges. Therefore, the slip between the core metal and the prepreg during prepreg winding is separated and corrected at each point and is not accumulated continuously, preventing the occurrence of wrinkles in the prepreg and separation from the core metal. It has an excellent feature that it is possible to improve the strength against bending stress of a tubular body having a steeply tapered part, and at the same time, it is possible to manufacture a tubular body such as a fishing rod with uniform strength by dispersing the wrapped ends of each prepreg. have

[Brief explanation of drawings]

Figures 1 and 2 are explanatory diagrams showing the manufacturing process of the present invention, Figures 3 through 6 are cross-sectional views during the manufacturing process, respectively, and Figures 7 and 8 are explanatory diagrams showing the conventional manufacturing process. It is. 1... Core metal, 2, 3, 4... Prepreg, A...
...Suddenly tapered part.

Claims (1)

[Claims] 1. A plurality of flip-pregs formed for each ply are wound one layer at a time around a core bar having a steeply tapered portion in the middle, and the winding edges of the plurality of prepregs are shifted from each other. A method for manufacturing tubular bodies such as fishing rods, which sequentially undergoes taping, thermosetting treatment, de-coring treatment, and tape peeling treatment.