JP2573298Y2 - Rod material - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a sheet-shaped prepreg obtained by impregnating a high-strength fiber with a resin, a small-width edge for positioning the prepreg on the small-diameter side of the tapered core, and a large-diameter of the tapered core. A wide edge to be positioned on the side and a pair of side edges connecting these, and one of the pair of side edges is formed as a linear reference side edge along the axis of the core material. A rod material formed into a tubular shape by forming the other side edge into a bent side edge composed of a plurality of linear portions in a non-parallel posture with the reference side edge, winding this prepreg around a core material and firing it. More specifically, the present invention relates to a technique for determining the condition of a rod.

[0002]

Conventionally, as a technique for determining the condition of rod material as described above, as shown in FIG. 4, the longitudinal prepreg P
Both ends in the direction are formed as a narrow edge 2 and a wide edge 3, and
One of the pair of side edges connecting the narrow edges 2 and wide edges 3
Side edge is formed as a straight reference side edge and a wide edge
Two lines with different slopes so that the width of the side is wider
The two linear portions are formed at the bent side edges having the portions 5A, 5A.
The distance between the connecting position of the boss and the reference side edge is the width of the wide edge.
The shape of the bent edge is set so that it is smaller than the length.
There is a technology in which the rod material is formed so as to be recessed toward the quasi-side edge, wound around the mandrel 1 as a core material, and then fired. It is configured to increase bending rigidity.

[0003]

Here, considering the rod material manufactured using the prepreg formed as described above, this technique requires only a change in the shape of the prepreg and a winding operation on the mandrel. Can be easily performed as in the prior art, but the difference in bending stiffness between the front end and the rear end of the rod material can be set large.

However, in this conventional prepreg, one of the pair of side edges is formed in a straight line along the axial direction of the mandrel.
This prepreg is wound around a mandrel because it is formed as a reference side edge and the other side edge is formed as a bent side edge where two linear portions are connected by substantially “V” -shaped corners. When this is done, stress concentrates on this corner and cracks may occur, disturbing the condition of this part. Also, if an attempt is made to form a "V" -shaped corner in the prepreg, this corner When cutting a part, overcutting is apt to occur, which often disturbs the condition.

[0005] In order to prevent inconvenience due to cracking of the prepreg, it has been customary to wind two prepregs around a mandrel in a state of being stacked, and this means causes cracking of the prepreg as described above. Although inconvenience is hardly caused, the winding around the mandrel is troublesome, and there is a demand for appropriate improvement of the above-mentioned conventional technology.

An object of the present invention is not to impair the good surface of obtaining a desired bending rigidity by simple winding of the prepreg as described above, and to prevent inconvenience such as cracking of the prepreg when winding the prepreg. The point is to constitute a rod material from which a good tone can be obtained.

[0007]

SUMMARY OF THE INVENTION As described at the beginning, the feature of the present invention is to provide a sheet-shaped prepreg formed by impregnating a high-strength fiber with a resin, and to place the sheet-shaped prepreg on the small-diameter side of the tapered core material. And a wide edge positioned on the large diameter side of the tapered core material, and a pair of side edges connecting them, and one of the pair of side edges is used as an axis of the core material. Formed on a straight reference side edge along the other side, the other side edge is configured as a bent side edge composed of a plurality of linear portions in a non-parallel posture with the reference side edge, and the prepreg is wound around a core material and fired. in rod material to be molded into a cylindrical shape by, contact between the linear portion
The distance between the connection position and the reference side edge is smaller than the width of the wide edge.
As described above, the shape at the bent side edge
Set to the state of recess toward the side edge, and
Smoothly connect these linear parts to the linear part connection position on the curved side edge.
Department is in that is formed with curved portion, its effects, and the effects are as follows.

[0008]

When the above features are configured as shown in FIGS. 1 to 3, for example, when the prepreg P is wound around the core material 1,
When the reference side edge 4 is wound in a state where the reference side edge 4 is set in a posture parallel to the axis X of the core material 1, the winding is completed as in the related art, and the prepreg P Since the linear portions 5A, 5A are connected by the curved portion 5B,
Even if stress is applied at the time of winding, the stress is dispersed at the curved portion 5B, making it difficult for cracks to occur. In addition, the shape of the prepreg P is such that the linear portion 5A is arranged with the curved portion 5B interposed therebetween. Therefore, unlike the related art, it is difficult to generate a crack or the like due to excessive cutting of the curved portion 5B.

That is, in the present invention, the winding of the core 1 is easier than in the case of using a plurality of prepregs P for the purpose of determining the condition of the rod material, and a somewhat strong external force acts during this winding. Even if there is, the change in the condition due to the crack of the prepreg P is suppressed.

[0010]

Therefore, a bent portion where stress concentration is likely to occur during winding on a mold without impairing a favorable surface of obtaining a desired bending rigidity by a simple prepreg winding operation.
Thus, a manufacturing method was achieved in which a good condition could be obtained without causing any inconvenience such as cracking in the prepreg by making a simple structural change .

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 2, a sheet-shaped prepreg P is formed by impregnating a thermosetting resin such as an epoxy resin into aligned carbon fibers (an example of high-strength fibers). during the prepreg P _1, P ₁ 2 sheets of which along a circumferential direction of the (one example of a core material) directions mandrel 1, sandwiching a prepreg P ₂ which has along its fiber direction in the axis X direction of the mandrel 1 As shown in FIG. 1, a narrow edge 2 for locating these overlapped objects on the small diameter side of a tapered mandrel 1 and a tapered mandrel 1
Of the mandrel 1 is formed into a shape having a wide edge 3 positioned on the large diameter side and a pair of side edges connecting the edges, and one of the pair of side edges is formed into a linear shape along the axis X of the mandrel 1. The reference side edge 4 is formed on the reference side edge 4 and the other side edge is formed on the reference side edge 4.
And two curved portions 5A, 5A in a non-parallel posture, and a curved portion 5B that smoothly connects the connecting portions of the linear portions 5A, 5A. . As shown in FIG.
The distance between the connection portion of the linear portions 5A, 5A and the reference side edge 4 is
Less than the width of the wide edge 3 and more than the width of the small edge 2
The shape at the bent side edge is adjusted to
It is set to be recessed toward the quasi-side edge.

Next, as shown in FIG. 3, the prepregs P ₁ , P ₂ , P ₁ superposed as described above are set with their reference side edges 4 parallel to the axis X of the mandrel 1. The heat-shrink tape 6 is wound on the upper surface of the roll, and the roll is fired at a predetermined temperature. Then, the tape 6 is removed and the mandrel 1 is pulled out. As a result, a cylindrical molded product is obtained, and thereafter, the rod material R is obtained by cutting both ends and performing a surface treatment such as painting and polishing.

In the present invention, as described above, the shape of the prepregs P ₁ , P ₂ , P ₁ is adjusted so that the winding amount of the prepregs P ₁ , P ₂ , P ₁ increases toward the rear end. Since it is set, at the time of completion, the bending rigidity becomes higher toward the rear end, and since the curved portion 5B is formed between the pair of linear portions 5A, 5A, when the prepreg 1 is wound around the mandrel 1, Even if a somewhat strong external force is applied, cracks such as cracks are unlikely to occur in the curved portion 5B, and after completion, the rod material R is in good condition.

[Alternative Embodiment] The present invention can be applied to, for example, a prepreg P having a structure in which high-strength fibers are arranged vertically and horizontally in a woven fabric. It is also possible to apply to a material that forms a rod material by winding a prepreg, and further configures a bent edge portion with three or more linear portions, and forms a curved portion between each linear portion. It is also possible to carry out.

In the claims of the utility model registration, reference numerals are written for convenience of comparison with the drawings, but the present invention is not limited to the configuration of the attached drawings by the entry.

[Brief description of the drawings]

FIG. 1 is a plan view of a mandrel and a prepreg.

FIG. 2 is a perspective view of a prepreg.

FIG. 3 is a perspective view when a prepreg is wound around a mandrel.

FIG. 4 is a plan view showing the shape of a conventional prepreg.

[Explanation of symbols]

 Reference Signs List 1 core material 2 small width edge 3 wide width edge 4 reference side edge 5 bent side edge 5A linear portion 5B curved portion P prepreg

Claims (1)

(57) [Scope of request for utility model registration] 1. A narrow edge (2) for positioning a sheet-shaped prepreg (P) formed by impregnating a resin with high-strength fiber on the small diameter side of a tapered core material (1), and a tapered core material It comprises a wide edge (3) located on the large diameter side of (1) and a pair of side edges connecting them, and one of the pair of side edges is connected to the shaft of the core material (1). A bent side edge (4A) formed of a linear reference side edge (4) along the core (X) and a plurality of linear portions (5A) in a non-parallel posture with the reference side edge (4). configured to 5), the prepreg (P) a rod material which is formed into a cylindrical shape by firing winding the core material (1), said linear portion (5A) connected position and the reference between Side edge
(4) is smaller than the width of the wide edge (3).
So that the shape at the bent side edge (5) is
Along with setting to be recessed toward the quasi-side edge,
These linear portions (5) are located at the connecting portions of the bent side edges (5).
A) A rod material having a curved portion (5B) connecting the two members smoothly.