JPH04214329A - Manufacture of tubular body - Google Patents

Abstract

PURPOSE:To manufacture a tubular body of high strength regardless of the diameter or the length through decreased number of steps by laminating arranged type warp fabric and arranged type weft fabric crossing perpendicularly said warp fabric to form a tape-shaped prepreg, winding said prepreg on a mandrel in the state of being overlapped partly in the width wise direction and burning. CONSTITUTION:A prepreg P is formed into a tape shape by laminating arranged type warp fabric 1 setting its reinforced fiber direction in the longitudinal direction and weft fabric 2 setting its reinforced fiber direction in the direction crossing perpendicularly said warp fabric 1 and impregnating the laminate with thermosetting resin to be formed into the tape shape. Said prepreg P is wound on the mandrel in the state of overlapping partly in the width wise direction. Then, a heat-shrinkable tape is wound on its upper face, and then burning is carried out.

Description

[Detailed description of the invention]

0001

TECHNICAL FIELD The present invention relates to a method for manufacturing a tubular body, and more particularly, to an improvement in the method for manufacturing a tubular body having a reinforcing fiber layer, such as those used for fishing rods, golf club shafts, etc. .

0002

[Prior Art] Conventionally, a tubular body on which a reinforcing fiber layer is formed as described above is produced by placing a plurality of sheet-like prepreg sheets of fibers aligned in a certain direction on a mandrel so that the directions of the fibers are orthogonal to each other. After being rolled, it is shaped by firing.

0003

[Problems to be Solved by the Invention] Now, considering the situation when manufacturing a tubular body using a sheet-like prepreg as described above, in this manufacturing method, the diameter and length of the manufactured tubular body are Not only does this require a cutting process, but it is also difficult to manufacture multiple types of tubular bodies with different dimensions and diameters, such as fishing rods. , a work process corresponding to each cutting size is required. or,
When winding a sheet prepreg around a mandrel, it is possible to perform the winding in a state where a large pressure contact force is applied between the prepreg and the mandrel or between the prepregs, by applying tension to the prepreg or other means. Although desirable, sheet prepreg has a large contact area, making it difficult to obtain a large pressure contact force. In addition, when winding a sheet prepreg, an air layer may be formed between the wound layers, and if the air layer is fired with the air layer formed, the air layer becomes a void and remains in the tubular shape. This will reduce the strength of your body. An object of the present invention is to provide a manufacturing method capable of molding a high-strength tubular body with a small number of steps, regardless of the diameter and length.

0004

[Means for Solving the Problems] The features of the present invention include aligned vertical fibers whose fiber direction is set in the longitudinal direction, and drawn type longitudinal fibers whose fiber direction is set perpendicularly or substantially perpendicularly to the longitudinal fibers. The method consists of forming a tape-like prepreg by overlapping aligned horizontal fibers, winding the prepreg around a mandrel so that it overlaps partially in the width direction, and baking it. its action, and
The effects are as follows.

[0005]

[Operation] When the above features are configured as shown in FIGS. 1 to 4, for example, the tape-shaped prepreg P is wound around the mandrel 3, so that when tension is applied to the prepreg P during winding, Even if this tension is a relatively small value, a larger pressure contact force is obtained than when using a sheet-like prepreg, and since the width of the tape is smaller than the sheet, an air layer is formed during winding. Furthermore, even if an air layer is formed, the air layer expands during firing and can move in the width direction of the tape and escape to the outside of the prepreg P.

[0006] In the manufacturing method in which cloth-like (fabric-like) prepreg P is cut into tape shapes, the fibers S, S
Since a space is formed between each structure and the mandrel 3, voids are likely to occur, and as shown in FIG. 7, the density of the fibers is lower than that of the structure of the present invention, and it is inferior in terms of strength. In other words, since the present invention is manufactured by winding a tape-shaped prepreg, it is possible to mold a wide variety of tubular bodies by simply selecting the shape of the mandrel, regardless of the diameter and length. A good press-contact state can be obtained without using devices that apply large pressure during winding, and voids are less likely to occur.

[0007]

[Effects of the Invention] Therefore, a manufacturing method has been obtained which requires fewer steps and can form a highly strong tubular body, regardless of the diameter and length. In particular, in the present invention, a stepped portion is formed on the outer surface of the tubular body as shown in FIG. 5, so that when used as a fishing rod, it is difficult to slip in the hand during operation and becomes easy to handle. In addition, when forming a twilled part on the outer surface of the middle part of the rod, as shown in FIG. By winding the forming tape-like prepregs one on top of the other at a large pitch, uneven parts are formed on the outer surface of the rod, which also has the effect of making it difficult for even a wet fishing line to adhere to this outer surface.

[0008]

Embodiments Hereinafter, embodiments of the present invention will be explained based on the drawings. 1 to 5 show a tubular body A used for fishing rods, etc.
represents the manufacturing process. In this process, as shown in FIGS. 1 and 2, the fiber direction of the reinforcing fibers is set in the longitudinal direction of the vertical fibers 1, which are aligned, and the fiber direction of the reinforcing fibers is set in the direction perpendicular to the vertical fibers 1. A prepreg P formed into a tape shape by overlapping aligned horizontal fibers 2 and impregnating it with a thermosetting resin such as an epoxy resin is used. This prepreg P has a width W of 15 mm, a thickness T1 of the vertical fibers 1 of 0.03 mm, and a thickness T2 of the horizontal fibers 2 of 0.03 mm.
The thickness is set to 2 to 0.7 mm, and each fiber is made of glass fiber, carbon fiber, or the like.

As shown in FIG. 3, during manufacturing, the prepreg P is wound around the mandrel 3 so as to partially overlap in the width direction. At the time of this winding, measures such as applying a braking force to the rotating shaft 4 of the tape are taken so that the prepregs P or the prepregs P and the mandrel 3 are brought into pressure contact with each other with an appropriate pressure. Next, as shown in FIG. 4, a heat-shrinkable tape 5 is wrapped around the upper surface of the prepreg P that has been wound, and then the molding is completed by firing. Incidentally, during this firing, the prepreg P is in a compressed state due to the shrinkage of the tape 5, and the resins of the prepreg P that overlap each other are integrated by the action of heat. Thereafter, the mandrel 3 is pulled out, the tape 5 is removed, and both ends are cut to obtain the tubular body A having the cross-sectional shape shown in FIG.

[Another Embodiment] The present invention may be used in the production of fishing rods, golf club shafts, and structural members of small machines, etc., and may be implemented to form a plurality of wound layers of the prepreg according to the present invention. is also possible. Furthermore, as shown in FIG. 6, the present invention can be implemented by winding the prepreg P for rod formation in an "x" shape around the outer surface of the wound surface of the prepreg according to the present invention to improve the feel. It is. Incidentally, although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of the drawing]

[Figure 1] Front view of tape-shaped prepreg

[Figure 2] Longitudinal side view of tape-shaped prepreg

[Figure 3] Perspective view of prepreg being wound onto a mandrel

[Figure 4] Perspective view of tape being wound around the outer surface of the prepreg

[Figure 5] Cross-sectional view of the tubular body after molding

[Fig. 6] Side view of a tubular body of another embodiment.

[Fig. 7] Cross-sectional view of a comparative example of the winding state of the prepreg of the present invention

[Figure 8] Cross-sectional view of a comparative example of the winding state of cross-shaped prepreg

[Explanation of symbols]

1. Vertical fiber 2　Weft fiber 3 Mandrel P prepreg

Claims (1)

[Claims] Claim 1: An aligned type vertical fiber (1) with the fiber direction set in the longitudinal direction, and an aligned type vertical fiber (1) with the fiber direction set in a direction perpendicular or substantially perpendicular to the vertical fiber (1). The horizontal fibers (2) are superimposed to form a tape-like prepreg (P), and at the same time, on the mandrel (3),
A method for producing a tubular body, in which the prepreg (P) is wound in a state in which it overlaps partially in the width direction, and then fired to form the tubular body.