JP3025034B2 - Ear rod and method of manufacturing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a head rod and a method for manufacturing the same, and more particularly to a technique for improving a head rod formed into a cylindrical shape.

[0002]

2. Description of the Related Art Regarding the head rod of a carbon rod formed into a cylindrical shape, in the case of a head rod formed into a cylindrical shape like this type, carbon fiber having a single fiber number of about 3,000 to 6,000 is epoxied. After winding a prepreg impregnated with resin etc. around a mandrel, it is usually manufactured by baking and hardening.
For a relatively small diameter mandrel, a prepreg of a aligned type with a fiber direction set in the direction of the axis of the rod so that the prepreg can be wound comfortably while suppressing springback (backed with extremely thin glass cloth) Is usually used).

[0003] The unit of the number of the single fibers constituting the fiber is usually called a filler, and the diameter of the single fiber is generally set to 6 to 8 micrometers .

[0004]

However, as described above,
In the case of using a prepreg of the alignment type in which the fiber direction is set in the direction of the axis of the rod, the binding force against the lateral deformation of the prepreg itself is small, so that the fiber is wound around the mandrel at the time of winding around the mandrel. In some cases, the material does not follow the core and is in a meandering state, causing a portion with uneven strength. In addition, since the gap between the fibers is so small that it is difficult to impregnate the resin, the elastic modulus after firing and the interlayer shearing The strength is often reduced and there is room for improvement.

[0005] The use of a cloth-shaped prepreg in which fibers having the same number of fillers (the number of single fibers) are woven and formed vertically and horizontally reduces these disadvantages to some extent, but does not suppress the aforementioned springback. However, it is difficult to use this type of prepreg.

SUMMARY OF THE INVENTION It is an object of the present invention to suppress the springback and to easily wind the prepreg, without impairing the good surface, that the fibers are wound along the mandrel axis at the time of winding around the mandrel, and It is an aspect of the present invention to rationally configure a spike rod that does not lower the elastic modulus and the interlaminar shear force later, and a method for manufacturing the same.

[0007]

[MEANS FOR SOLVING THE PROBLEMS] To achieve the above object
In particular, the tip rod of the present invention is parallel or nearly parallel to the rod axis.
Are arranged in parallel directions and the number of single fibers is set to 1000 or less.
Defined longitudinal fiber, perpendicular to the direction of the longitudinal fiber or
Are arranged in a direction almost perpendicular to the density of the longitudinal fibers.
Cloth consisting of weft fibers with low density
And impregnated with resin to form a cylindrical shape.

[0008] Further , the method of manufacturing a head rod according to the present invention comprises:
It is arranged in a direction parallel or almost parallel to the axis,
A longitudinal fiber whose number of fibers is set to 1000 or less;
Placed in a direction perpendicular or nearly perpendicular to the direction of the fiber
And the horizontal density is set lower than the density of the vertical fibers.
A resin cloth is impregnated with a fiber cloth
Prepreg is wound around a mandrel,
And formed into a cylindrical shape.

[0009]

When the above features are configured as shown in FIGS. 1 to 3, for example, when a prepreg is wound around a mandrel at the time of manufacturing, it is compared with a cross-shaped prepreg in which fibers having the same number of fillers are woven vertically and horizontally. As a result, springback is suppressed, and in the present invention, weft fiber
Since the fiber density is smaller than the fiber density of the vertical fiber ,
The value of springback can be reduced compared to the past,
Also, at the time of this winding, the turbulent fibers 2 suppress the turbulence of the longitudinal fibers 1 in the axial direction of the mandrel 4, and further, the woven fibers 2 are inserted between the longitudinal fibers 1. The impregnation of the resin 3 is promoted through the gap through which the weft fibers 2 pass.

After firing, the longitudinal fibers 1 are maintained in a uniform posture along the axis X of the rod R without being disturbed, and the resin 3 is sufficiently filled between the longitudinal fibers 1. since the cured filling state, the longitudinal fibers 1,1 with each other <br/> in the state of being bonded with the resin 3 is sufficiently exhibit the strength of the longitudinal fibers 1, moreover, the longitudinal fibers 1,1 with each other The displacement in the shearing direction is suppressed by the resin 3 and the weft fiber 2.

That is, in the present invention, unlike the case where the longitudinal fibers 1 and the weft fibers 2 are simply overlapped, a cloth woven of the respective fibers is used, so that the weft fibers 2 suppress the disturbance of the longitudinal fibers 1. Not only that, since the fibers intersect with each other to form a gap, the strength in the shear direction can be improved and the impregnation of the resin can be promoted as described above.

[0012]

Therefore, the prepreg can be wound comfortably by suppressing the springback, without impairing the good surface. At the time of winding on the mandrel, the fiber is along the mandrel axis and after firing. Thus, the spike rod that does not lower the elastic modulus and the interlaminar shearing force at the same time, and the manufacturing method thereof were rationally configured.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1 to 3 show a method for producing a head rod according to the present invention. In this method, first, a longitudinal fiber is formed by a carbon fiber yarn having a relatively small number of single fibers from 10 fillers to 1000 fillers. 1 and the transverse fibers 2 are formed, and the density of the transverse fibers 2 in the posture along the circumferential direction of the rod R is lower than the density of the longitudinal fibers 1 in the posture along the axis X of the rod R after molding. As shown in FIG.
Relative spacing D _1, spacing D ₂ of the transverse fibers 2 is 1: fiber cloth set the relative relationship between respective so as to be about 3 impregnated with a resin 3 to form a prepreg P in.

The diameter of the single fiber used for this fiber is 6
To 8 micrometers . Next, this prepreg P is wound around a mandrel 4 having a tip diameter of about 0.5 mm by about 1 ply to about 3 plies, and then fired to cure the resin to form a cylindrical shape. I have.

The spike rod R according to the present invention is formed by sintering in this manner, and by being manufactured in this manner, the longitudinal fibers 1 are aligned without being disturbed along the axial direction of the rod. And the resin is cured in a state in which the resin 3 is sufficiently filled between the longitudinal fibers 1, so that the longitudinal fibers 1 and 1 are joined to each other with the resin 3 so that the strength of the longitudinal fibers 1 And the displacement in the shearing direction between the longitudinal fibers 1 and 1 is suppressed by the resin 3 and the weft fibers 2.

[Other Embodiments] In addition to the above-described embodiment, the present invention provides, as shown in FIGS. 4 and 5, for example, a prepreg P in which a spike rod R is formed as described above .
Are prepared, and one ply of the prepreg P is wound around the mandrel 4, and the fiber direction is changed to the rod axis X.
Pre-preg Q of aligned carbon fiber set in the direction
May be wound in one ply, and the above-mentioned prepreg P may be wound in one ply, so that three fiber layers are formed as shown in FIG. The respective layers are referred to as P, Q and P together with the prepreg number.

In FIG. 5, the three layers P, Q, and P are shown as being independent of each other, but after firing, the respective resins are fused together to be integrated. Further, in the present invention, as shown in FIG. 6, the longitudinal fibers 1 and the weft fibers 2 are set at substantially equal intervals, and the number of fillers of the weft fibers 2 is set to be smaller than the number of fillers of the weft fibers 1. The horizontal fiber 2 is determined by the density of the vertical fiber 1
There are various means for setting the density of the sheet to be low.

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration shown in the attached drawings.

[Brief description of the drawings]

FIG. 1 is an enlarged view of a prepreg.

FIG. 2 is a view showing a mandrel and a prepreg.

FIG. 3 is a cross-sectional view of a tip rod.

FIG. 4 is a view showing a mandrel and a prepreg in another embodiment.

FIG. 5 is a cross-sectional view of a tip rod according to another embodiment.

FIG. 6 is a diagram showing a form of a fiber in another embodiment.

[Explanation of symbols]

 Reference Signs List 1 vertical fiber 2 horizontal fiber 4 mandrel P prepreg X axis core

Claims (2)

(57) [Claims] 1. A rod parallel or substantially flat with respect to a rod axis (X).
And the number of single fibers is set to 1000 or less.
The longitudinal fiber (1) and the direction of the longitudinal fiber (1)
The longitudinal fibers arranged in a direction orthogonal or substantially orthogonal
Weft fiber whose density is set lower than that of (1)
(2) A spike rod formed by impregnating a resin into the fiber cloth and forming the fiber cloth into a tubular shape. 2. The rod is parallel or substantially flat with respect to the axis (X) of the rod.
And the number of single fibers is set to 1000 or less.
The longitudinal fiber (1) and the direction of the longitudinal fiber (1)
The longitudinal fibers arranged in a direction orthogonal or substantially orthogonal
Weft fiber whose density is set lower than that of (1)
(2) and was immersed if the fiber cloth resin consisting to form a prepreg (P), winding the prepreg (P) to the mandrel (4), the top rod manufacturing method of forming a sintered to cylindrical .