JPH0298375A - Golf club shaft and manufacture thereof - Google Patents

Abstract

PURPOSE:To enable a kick point to be clearly set while preventing torsional rigidity from reduction and further stress from concentration by constituting a golf club shaft of a top inner layer of a cloth prepreg wound invertedly tapered and laminated, an intermediate layer of fibers at + or -45 deg. angle to the axis and an outer layer of cloth prepreg wound at + or -30 deg.-+ or -70 deg. to the axis. CONSTITUTION:A golf club shaft is constituted of a top inner layer 3 laminated inversely tapered and having a small diameter part 2a thickened at the top end and thinned at the rear end in inner layer 2, an intermediate layer 4 laminated on the outer periphery of the smallest diameter part 2d formed on the rear end of the small diameter part 2a of the inner layer 2 and having fibers at + or -45 deg. to the axis (a) and a laminated outer layer 5 making + or -30 deg.-+ or -45 deg. at the top end and + or -70 deg. at the rear end with the axis (a). Thus, the strength and shock resistance can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a golf club shaft made of fiber-reinforced plastic and a method for manufacturing the same.

[Conventional technology]

Conventionally, a golf club shaft and a method for manufacturing the same in which the kick point can be arbitrarily selected is disclosed in Japanese Patent Application Laid-Open No. 57-29374 (hereinafter referred to as Conventional Example 1).
, JP-A-59-111772 (hereinafter referred to as conventional example 2), JP-A-58-94867 (hereinafter referred to as conventional example 3), etc.

[Problem to be solved by the invention]

However, in Conventional Example 1, a tapered stepped portion is provided between the large-diameter portion and the narrow-diameter portion, and there is no specificity in the constituent materials and the structure thereof.
If the kick point is made of a known material, the best position for the kick point is around 440 points from the tip, and there is a problem in that the kick point cannot be arbitrarily selected.

In addition, in the manufacturing method of Conventional Example 2, the two core metals are reversely tapered,
This is a method of connecting, and although it does have an effect,
It is necessary to manufacture two core metals and to connect them together, and after molding, a process of separating the core metals and a process of de-coring twice are required, resulting in a problem of decreased productivity and increased cost.

Furthermore, in Conventional Example 3, when using a CF RP pipe as a base, the CFRP is molded once, processed to provide a tapered change part, and then resin is applied to the outer periphery and a filament winding layer is formed. , curing and molding steps are required, resulting in poor productivity (and high cost).

Furthermore, Conventional Example 2 has the problem that the kick point does not appear clearly when the ball is simply reversely tapered, and the smaller the minimum diameter of the reversely tapered ball, the lower the twisting rigidity and the more likely the ball will be shaken.

The present invention solves these problems of the conventional technology, makes it possible to clearly set the kick point, and also prevents a decrease in twisting rigidity, prevents the concentration of stress on the strands, and improves impact resistance. Our aim is to provide a golf club shaft that also improves performance and a manufacturing method for it.
That is the purpose.

[Means to solve problems]

In order to achieve the above object, the golf club shaft of the present invention is composed of high-strength, high-elasticity fibers and thermosetting, thermoplastic resin, in which the fibers are parallel to each other in the axial direction, and the tip The inner layer has a small diameter part on the side, a large diameter part on the rear end side, and a steeply tapered part between them, and the inner layer has a reverse taper with a thick wall at the tip of the small diameter part and a thin wall at the rear end of the small diameter part. A tip inner layer formed by winding a cross prepreg, and an intermediate layer formed by winding and layering around the outer periphery of the smallest diameter part formed at the rear of the small diameter part of the inner layer, and whose fibers have an angle of ±45° with respect to the axis. , winding the cross tape prepreg at ±30° to the axis.

and an outer layer having an angle of .

The method for manufacturing the golf club shaft includes forming a parallel portion with a small diameter on the leading end side, a tapered portion with a large diameter on the rear end side, and forming a core having a steeply tapered portion between the parallel portion and the tapered portion of the parallel portion. The process of applying mold release agent and resin to the outer periphery of the gold,
Winding a prepreg in which the fibers are parallel to the axial direction and a portion corresponding to the rear portion of the parallel portion is removed around a core metal to form an inner layer having a minimum diameter portion at the rear portion of the parallel portion;
A step of winding the prepreg cut into a substantially trapezoidal shape around the minimum diameter part of the inner layer to form an intermediate layer in which the fibers have an angle of ±45° with respect to the axis; ±70' at the rear end, ±3' at the tip
A step of winding the outer layer at 0' to ±45°, and a step of winding the cross prepreg with a reverse taper that is thicker on the leading end side and thinner on the rear end side of the parallel part, and between the core metal and the inner layer. Alternatively, it is a manufacturing method comprising a step of forming a winding layer between an inner layer and an outer layer to form an inner layer at the tip end, and a step of heating and curing by a conventional method.

[Effect]

In the golf club shaft configured as described above, the kick point can be arbitrarily selected by setting the length of the small diameter part of the inner layer, and the twist angle can be determined by the material and number of layers of the intermediate layer, the material of the outer layer, the number of layers, and the cross tape preform. It can be arbitrarily selected depending on the structure, number of layers, and material of the plate.

In addition, the strength is improved by the reversely tapered inner layer provided inside the tip, and the materials for composing the inner layer of the tip include glass, polyester, nylon, polyamide organic fiber, carbon, in addition to ultra-high molecular weight polyethylene. Any material with a low specific gravity such as graphite fiber may be used, and alignment sheets and cloth can also be used, and the fiber direction can be arbitrarily selected depending on the purpose.

The inner layer (0° layer) may be divided into two or three layers in order to reduce material loss due to deletion, and the auxiliary winding pattern of the middle layer may be made of carbon prepreg or in order to obtain the same physical properties. In addition, the outer layer of carbon cloth tape prepreg may be wound in more layers only in this part than in other parts. In addition to carbon, the outermost cross tape prepreg is made of graphite, boron, ceramic, polyamide organic fiber, metal fiber, metal foil tape, ultra-high molecular weight polyethylene, and one or more of these fibers mixed with metal plating. It may also be something you have.

Also, the inner layer is not limited to carbon, like the above-mentioned cross tape prepreg.

Furthermore, impact resistance can be improved by providing a ±θ° layer on the outer layer to protect the inner layer (0° layer).

〔Example〕

Embodiments of the golf club shaft of the present invention will be described below with reference to the drawings.

As shown in FIGS. 1 and 2, the golf club shaft 1
has a hollow small diameter part 2a on the front end side, a hollow tapered large diameter part 2b on the rear end side, and a hollow part with an outer diameter that suddenly changes between the small diameter part 2a and the large diameter part 2b. The inner layer 2 is provided with a steeply tapered portion 2C and fibers are provided in 00 layers parallel to the axial direction, and the tip portion of the small diameter portion 2a in the inner layer 2 is thickened, and the rear end portion of the small diameter portion 2a is made thick. The tip inner layer 3 is layered in a reverse tapered manner to be thin, and the inner layer 2 is layered on the outer periphery of the minimum diameter portion 2d formed at the rear end portion ζ of the small diameter portion 2a, and the fibers are layered along the axis a. The intermediate layer 4 has an angle of +45° to the axis a, and the tip has an angle of ±30° to ±±
The outer layer 5 is laminated to have an angle of 45 degrees and an angle of ±70' at the rear end.

That is, the inner layer 2 is made of carbon prepreg (Trading card 3053-15 manufactured by Toshi Co., Ltd. 2e), IC4, P#
It is cut as shown in FIG. 2, wound around a core bar, and layered as described above to have a small diameter part 2a, a large diameter part 2b, a steeply tapered part 2C1, and a minimum diameter part 2d.

The tip inner layer 3 is made of a cross prepreg 3a impregnated with cross Epoquine resin woven from ultra-high molecular weight polyethylene fibers (see Figure 4), cut into triangles as shown in C1, and wound to form a reverse taper. However, the tip inner layer 3 is wound around the tip of the core metal so that the tip of the small diameter portion 2a of the inner layer 2 is thick and the rear end is thin. It is wound around the outer periphery of the distal end of the inner layer 2, which has a double layer structure, to form a reverse taper.

That is, the tip inner layer 3 can be formed inside the tip of the inner layer 2, as shown in FIG. 1d, or outside the tip of the inner layer 2, as shown in FIG.

By thus providing the reversely tapered tip inner layer 3 and by removing a portion of the prepreg 2e that forms the inner layer 2 in advance, the minimum diameter portion 2d is formed on the rear side of the small diameter portion 2a. .

In addition, the intermediate layer 4 is made of carbon prepreg (see Figure 7), IC4,
As shown in &-1, the fiber direction is +45 with respect to axis a.
It is formed by cutting the trapezoids at angles of -45° and polymerizing them and winding them around the outer periphery of the minimum diameter portion 2d.

Furthermore, the outer layer 5 is made of carbon cloth prepreg
l-1/ Force T300-3, 3 vertically/c1n, 3 horizontally/
Figures 9 to 11 show the cross tape prepreg 5a made by slitting α epoxy resin (36 wt%) to a width of 161111 mm.
As shown in the figure, the rear end is wound at an angle of +70° and the tip at an angle of +1° to 45° with respect to the axis a, and the outer layer is wound at an angle of 1° to 45° at the tip and 1° to 45° at the rear end. The film is wound at an angle of 70°, and an arbitrary layer is wound on the outer layer in the same manner as described above, followed by heating and curing by a conventional method to form a single layer.

Figures 3 to 11 are the above-mentioned golf clapshaft l-1.
This shows the manufacturing method in order of steps, and this manufacturing process is as follows: (b) Tip diameter d″=g4.42in, =g4.42in
, parallel section 011. Length from the tip z = 4oo Diameter of the steeply tapered part 6b of the dragon d' = 10.3311 m% What is the length of the tapered part 6C from the steeply tapered part 6b to the rear end? lJ diameter d=
9313.08+u+ 1 Step of preparing a core bar 6 with an effective length l = 1120 m and applying a mold release agent and epoxy resin to the core bar 6, As shown in Figure 4, the cross prepreg made with
Cross prepreg 3a cut into a right triangle of mm, or the same figure (as shown in q, base b = 97 m, height h = 20
A cross prepreg 3a cut into a deformed rectangle of 0 mm is wound around the tip of the parallel part 6a of the core bar 6 with its base aligned with the tip of the core bar 6 under a pressure of 500 kLi. This, tip diameter d"-g 6.33 ra
m, length l"' from the tip = 'l Q 1 diameter d"' at the position of Q+m = 1214.42 wm Step of forming the tip inner layer 3, e→ Fig. 6) ~←1 As shown, a prepreg 2e is obtained by cutting a carbon prepreg (TOKYO, Trading Card 3053-15) whose fibers are parallel to the axial direction by cutting out 2 fl of one side corresponding to the rear end of the parallel part 6a of the core bar 6. is wound around the outer periphery of the core bar 6 and the tip inner layer 3 under a pressure of 400 # to form an inner layer 2 having a minimum diameter portion 2d at the rear end of the parallel portion 6a, (b) Carbon prepreg (East, trading card 305312
), the fiber direction is the axis a (as shown in FIG. 7 (q) or C1 (±45°, −45°), and the prepregs 4a, 4a are cut into isosceles trapezoids and are polymerized, or As shown in Figure 8), a cross prepreg 4a, which is woven so that the fiber direction is ±45° and cut into an isosceles trapezoid, is placed at the outer periphery of the minimum diameter part 2d of the inner layer 2, as shown in Figure 8. (e) Step of winding the carbon cloth preplex (towards the east, trading card T3
00-3, 3 vertical lines ΔL 3 horizontal lines, Mu, epoxy resin i 3
As shown in FIG. 9, a cross tape prepreg 5a in which 6 wt%) is slit to a width of 16 WII has a rear end winding angle α of +70° and a tip winding angle β=10° with respect to the axis a.
The cross tape prepreg is wound around the outer periphery of the inner layer 2 and intermediate layer 4 in a helical manner so that the end thereof is in close contact with the angle of ~+45°, and the tip winding angle β is applied to the outer periphery as shown in FIG. =-I°~-45°, rear end winding angle α--7
Wind it so that it is 0°, and again, as shown in Fig. 11, the rear end winding angle α = +70°, the tip winding angle β = +A ~ +
A step of forming an outer layer 5 of the θ° layer by winding a total of 3 times so that the angle is 45°; Steps of winding with tension of 5 people and 7 hours and heating and hardening at 130℃ for 2 hours. After removing the mark, the steps include painting with epoxy resin or polyurethane resin. Through the above steps, as shown in Figure 1, the tip diameter D' = Yu85 and the rear end diameter D.
= 15.2 mlK, length L”1120in, weight 6
8,9.7 Vy resistance 150 mm, twist angle 5.3
° (1 pound, feet), kick point 335 f
A golf club shaft l having dimensions and performance of l was obtained.

Further, the manufacturing process in another embodiment shown in FIG. 2 is a case where the process order of (C4 and C1) in the above-mentioned embodiment is reversed.

In other words, the order of the steps is ge), 什→, (shu, ni), dan, (he)
, (G).

[Comparative Example 1] Tip diameter d'' = 934.83 mm 1 Length l'' of parallel portion 6a = 32011 m, Length from tip l' = Diameter at 400 mm d' = l IO, 33J1
1. Rear end diameter d = 13.08s++++.

Step of preparing core bar 6 with effective length/=1120 mm, (
B) A cloth prepreg woven from ultra-high molecular weight polyethylene fibers and impregnated with epoxy resin is cut into a right triangle with a base of 97B and a height of 200M.The prepreg 3a is wound around the tip of the core bar 6, and the tip diameter dl11 = φ6.3
Step of forming the reverse tapered tip inner layer 3 of 3jli+: wind the carbon prepreg 2e cut as shown in Fig. 6) around the outer circumference of the core bar 6 and the tip inner layer 3;
Step of forming the inner layer 2) In the above embodiment...
The steps are the same as those in (f) and (g), and the above steps result in a fin with a tip diameter of φ8.5,
Rear end diameter g315.2m, length 1120mm, weight 65!
! , flex 150mm, twist angle 8° (1 lb,
A golf club shaft having a performance of 335 m) and a kick point of 335 m) was obtained.

[Comparative Example 2] Tip diameter d'' = gJ4.83mm, parallel part 6
Length of a = 320 Dragon, length from tip/' = 40
0 Diameter at dragon point d' = 10.5311111 Rear end diameter d
= 113.08 M, effective length/=1120fl
Step of preparing the core metal 6 (q) Carbon prepreg 2e cut as shown in FIG. 6(c) is added to the core metal 6.
The process of directly winding El is the same process as each process (E), (F), and (G) in the above embodiment, and the above steps lead to a tip diameter of φ7n and a rear end diameter of 1i! 115.2m11. Length 1120m+, weight 6
4g, flex 150jfl, twist angle 9° (1
A golf club shaft having a performance of 332n (pounds, feet) and a kick point of 332n was obtained.

〔Effect of the invention〕

Since the present invention is configured as described above, the kick point can be set to a super first tone of 335 fml or any other desired value, and a decrease in the twist angle can be compensated for, desired performance can be obtained, and the inner layer 2 The kick point can be arbitrarily selected by setting the length of the small diameter portion 2a, and the twist angle can also be arbitrarily selected by the material and number of layers of the intermediate layer 4 and the configuration, number of layers, and material of the cross tape prepreg 5a. By providing the tip inner layer 3 with a reverse taper to the tip, the strength is improved, and the outer layer 5 has a ±θ°
Since the layer (inner layer) is protected, impact resistance can also be improved.

By adopting the manufacturing method of the present invention, the kick point can be arbitrarily selected by setting the length of the parallel portion 6a of the core bar 6, and the twisting angle can also be changed depending on the material of the intermediate layer 4.
The number of layers and the structure of the cross tape prepreg, the number of layers, and the material can be arbitrarily selected, and it is possible to easily manufacture a golf club shaft with improved strength and impact resistance at the tip.

[Brief explanation of drawings]

FIG. 1 is a longitudinal side view showing an embodiment of the golf club shaft according to the present invention, FIG. 2 is a longitudinal side view showing another embodiment of the golf club shaft, and FIGS. 3 to 11 are FIG. 3 is a process diagram showing the golf club shaft manufacturing method in the order of steps. l...Golf club shaft 2...Inner layer 2a
...Small diameter part 2b...Large diameter part 2C...Suddenly tapered part 2d...Minimum diameter part 3...Inner layer of reverse tapered tip 4...Middle layer 5...Outer layer 6 Core metal 6a...Parallel part 6b...Suddenly tapered part
6c...Tapered part a...Axis line

Claims (2)

[Claims] (1) In a golf club shaft made of high-strength, high-elasticity fibers and thermosetting, thermoplastic resin, the fibers are parallel to the axial direction and have a small diameter portion on the tip side and a large diameter portion on the rear end side. an inner layer with a steeply tapered portion between them, and a tip inner layer formed by winding cross prepreg in a reverse taper shape, with a thick wall at the tip of the small diameter portion of the inner layer and a thin wall at the rear end of the small diameter portion;
A winding layer is formed on the outer periphery of the smallest diameter part formed at the rear of the small diameter part of the inner layer, and an intermediate layer in which the fibers have an angle of ±45° with respect to the axis, and a cross tape prepreg are wound with a winding layer of ±3 with respect to the axis.
1. A golf club shaft comprising: an outer layer having an angle of 0° to 70°. (2) Apply mold release agent and resin to the outer periphery of the core bar, which has a small diameter parallel part on the tip side, a large diameter taper part on the rear end side, and a steep taper part between the parallel part and the tapered part. The process of
A prepreg whose fibers are parallel to the axial direction and a portion corresponding to the rear portion of the parallel portion is removed is wound around a core bar, forming an inner layer having a minimum diameter portion at the rear portion of the parallel portion, and cutting into a substantially trapezoidal shape. A process of winding the prepared prepreg around the smallest diameter part of the inner layer to form an intermediate layer in which the fibers have an angle of ±45° with respect to the axis; 70°, ±30 at the tip
A process of winding the outer layer at an angle of ゜~±45゜, and a step of winding the cross prepreg between the core bar and the inner layer in a reverse tapered manner so that the wall is thicker on the leading end side of the parallel part and thinner on the rear end side, or 1. A method for manufacturing a golf club shaft, comprising the steps of: winding between an inner layer and an outer layer to form a tip inner layer; and heating and curing using a conventional method.