JPH04304832A - Production of pipe - Google Patents

Abstract

PURPOSE:To produce a pipe such as a fishing rod having a large-diameter part while preventing the lowering of strength caused by the loosening and breakage of prepreg by winding a specific prepreg around a core material having large-diameter part in a specific winding state and baking the product. CONSTITUTION:Prepregs 2, 3 are wound around a core material 1 having tapered part 1A and a modified cross-section part 1B in such a manner as to overlap the prepregs at each boundary part and the wound product is cured by baking. The prepreg 2 is an aligned-type prepreg containing fibers directed in axial direction X and the prepreg 3 is a cloth-type prepreg having fibers crossing in lateral and longitudinal directions.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] The present invention relates to a method of manufacturing a tubular body, and more specifically, the present invention relates to a method of manufacturing a tubular body, and more specifically, a tubular body that is formed into a gently tapered shape as a whole, such as the base rod of a fishing rod, is provided with a grip or the like at the rear end. The present invention relates to a method for integrally manufacturing a tubular body having a large diameter portion.

0002

[Prior Art] Taking as an example conventional fishing rods for fishing on the shore and for sweetfish, these types of rods have a large diameter section formed at the rear end of the main rod, so that when the rod is gripped, There are some that are designed to improve the feel of the rod and improve the operability of the rod. In addition, in a rod having a large diameter portion at the end in this way, the large diameter portion is formed in the shape of a grip or the like so that it is larger than the extension line of the outer surface of the rod, which is formed into a gentle taper shape. The cross-sectional shape of this large diameter portion is not only circular, but also elliptical or polygonal. Conventionally, when manufacturing such a rod, a tapered surface portion whose diameter increases from one end to the other in the axial direction, and a continuous rod is provided at the end position of the large diameter side of this tapered surface portion. and a different-diameter surface portion formed to have a larger diameter than the extension line of the tapered surface portion, and which is formed in correspondence with the tapered surface portion and the different-diameter surface portion, and whose fiber direction By winding two kinds of sheet-like prepregs of the aligned type in the axial direction of the core material on each side and firing them, a tubular body having a shape that follows the outer surface shape of the core material is obtained. There is.

0003

[Problems to be Solved by the Invention] Now, considering the manufacturing of a tubular body by winding prepreg around a core material having the shape described above, it is difficult to understand that two types of prepreg are used as described above. Even when the diameter of the different-diameter surface portion is relatively large during winding, winding is easy. In addition, when winding prepreg around a mandrel in this way, when winding by rotating the core material, the small diameter part (part corresponding to the tapered surface part)
There is an inconvenience that sagging and cracking are likely to occur at a portion where the circumference changes greatly between the large diameter portion and the large diameter portion (the portion corresponding to the different diameter portion). In addition, in the prepreg currently used, the fiber ratio tends to be high, that is, the fiber ratio tends to be high, and since there are no horizontal fibers in the prepreg that forms the different diameter part, the fiber ratio tends to be high. ) The inconveniences related to In particular, when this aligned type prepreg is used, the contact area between the different diameter surface and the prepreg is relatively small when winding around the different diameter surface. This tension or pressure tends to act on the prepreg, and the thickness of the prepreg becomes uneven due to the action of this tension or pressure. Wrinkles may occur during rolling, so there is room for improvement in terms of strength and manufacturability. This winding work has conventionally been done by machine, but in cases where wrinkles are likely to occur, only winding of the prepreg around the different diameter surface portion may be done manually. The purpose of the present invention is to rationally configure a manufacturing method for obtaining a tubular body having a large diameter portion without impairing the effectiveness of using two types of prepreg, without deterioration in strength, and without requiring much effort. It is in.

0004

[Means for Solving the Problems] The present invention is characterized by a tapered surface portion whose diameter increases from one end to the other end in the axial direction, and which is connected to the large diameter end position of the tapered surface portion. and a different diameter surface portion formed to have a larger diameter than the extension line of this tapered surface portion to constitute a core material,
A fiber-reinforced prepreg having fibers in the axial direction is placed on the tapered surface of this core material, and a cross-shaped fiber-reinforced prepreg in which the fibers intersect vertically and horizontally is placed on the different diameter surface of this core material at the respective boundaries. After winding the prepreg so that it overlaps the parts, it is fired to harden each prepreg, and its functions and effects are as follows.

[0005]

[Operation] If the above feature is configured as shown in FIGS. 1 to 5, for example, the cross-sectional shape of the different diameter surface portion 1B is not circular, but is wound with a corner portion as shown in FIG. Even if strong pressure is sometimes applied locally to the prepreg 3, the thickness of the prepreg 3 does not change much, and wrinkles due to uneven thickness etc. are less likely to occur.
Moreover, since the respective prepregs 2 and 3 overlap at the boundary, during firing, the respective prepregs 2 and 3 overlap at this overlapped part.
, 3 are fused and integrated. In other words, in the present invention, since the aligned type prepreg 2 is used in the tapered surface portion 1A, this part exhibits the strength compared to the conventional one, and the cross-shaped fiber reinforced type prepreg 3
has a high strength to withstand tension in any direction, so the prepreg 3 is applied with relatively strong pressure to conform to the shape of the different diameter surface portion 1B. Alternatively, even if the winding is performed using a relatively strong tension, there is no problem such as reducing the thickness of the prepreg 3, and moreover, the prepreg 3 can easily conform to the different diameter shape of the core material 1. This makes it possible to use machines for winding work without relying on manual labor.

[0006]

[Effects of the Invention] Therefore, a manufacturing method for producing a tubular body having a large diameter portion without impairing the effectiveness of using two types of prepreg, without deterioration in strength, and without requiring much effort can be rationally constructed. It was.

[0007]

Embodiments Hereinafter, embodiments of the present invention will be explained based on the drawings. 1 to 6 show a method of manufacturing a main rod of a fishing rod as a tubular body according to the present invention, and in this method,
As shown in FIG. 1, first, the tapered surface portion 1A gradually increases in diameter from one end to the other end in the axis X direction.
A mandrel 1 (with a core material An example) is used, and on the tapered surface portion 1A of this mandrel 1, an aligned type prepreg 2 whose fiber direction is set in the axial center A cross-shaped fiber-reinforced prepreg 3 in which the fiber-reinforced prepregs intersect vertically and horizontally is wound in a predetermined number of plies so as to overlap at each boundary. The different diameter surface portion 1B is
As shown in FIG. 6, its cross-sectional shape is approximately triangular and non-rotatable, making it easy for anglers to hold and operate.

As shown in FIG. 2, this winding is carried out on a surface plate 4 with the prepregs 2 and 3 overlapped at the boundary.
Set the prepregs 2 and 3 on the top surface of the mandrel 1 with these prepregs 2 and 3 sandwiched between it and the mandrel 1.
A means is used for winding each of the prepregs 2 and 3 around the mandrel 1 at a time while rotating the mandrel, and the prepregs 2 and 3 are wound around the mandrel 1 at a time to increase the overlapping area at the boundary.
The cutting edges 2A, 3A on opposite sides of the mandrel 1 are inclined with respect to the circumferential direction of the mandrel 1, and the overlap value S is set to about 5 mm. Next, as shown in FIGS. 3 and 4, a heat-shrinkable tape 5 is wound around the prepregs 2 and 3 so as to form slits on the outer surfaces of the prepregs 2 and 3, and then fired. Along with the fusion of the prepregs 2 and 3, the prepregs 2 and 3 are cured. Incidentally, during this firing, pressure to tighten the mandrel 1 is applied to the prepregs 2 and 3 due to the shrinkage of the tape 5, so that the prepregs 2 and 3
is formed into a shape that follows the outer shape of the mandrel 1. Next, by pulling out the mandrel 1, removing the tape 5 and cutting both ends, as shown in FIG. The main rod material R is obtained in a tubular shape having a large diameter portion Rb.

[Other Embodiments] In addition to the above embodiments, the present invention includes
For example, as shown in FIG.
It is also possible to set the cross-sectional shape of B to be quadrangular, or to set the cross-sectional shape of mandrel 1B to a circular shape as shown in FIG. By bringing the mandrel and roller into contact and feeding the prepreg between them while rotating simultaneously, each prepreg can be supplied to the mandrel, etc.
The shape of the different diameter surface portion and the means for winding the prepreg around the mandrel can be implemented in various ways. 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 by the reference numerals.

[Brief explanation of drawings]

[Figure 1] Plan view at the start of winding the prepreg onto the mandrel

[Figure 2] Cross-sectional view showing the arrangement of the surface plate and prepreg

[Figure 3
】Side view of completed winding of prepreg onto mandrel

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

[Figure 5] Side view of the tubular body in the completed state

[Fig. 6] Cross-sectional view taken along the E--I line in Fig. 3

[Fig. 7] Cross-sectional view of a different diameter surface part of another embodiment

[Fig. 8] Cross-sectional view of a different diameter surface part of another embodiment

[Explanation of symbols]

1 Core material 1A Tapered surface part 1B Different diameter surface part 2 Prepreg 3 Prepreg X Axial center

Claims (1)

[Claims] Claim 1: A tapered surface portion (1A) whose diameter increases from one end side to the other end side in the axis (X) direction, and a tapered surface portion (1A) that is connected to the large diameter end position of the tapered surface portion (1A). and a different diameter surface portion (1B) formed to have a larger diameter than the extension line of this tapered surface portion (1A) to form a core material (1), and the taper of this core material (1). Surface part (1A)
A fiber-reinforced prepreg (2) having fibers in the axis (X) direction is placed on the different diameter surface portion (1B) of the core material (1).
A cross-shaped fiber-reinforced prepreg (3) in which the fibers intersect vertically and horizontally is wound so that the fibers overlap each other at the boundary, and then fired to harden each prepreg (2) and (3) into a tubular shape. How the body is manufactured.