JPH11137734A - Golf club head - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a comfortable impact sound by using a vibrating material with a specified value of vibration loss coefficient or less at least in a part of the golf club head. SOLUTION: Epoxy resin hardened at 180 deg.C is rolled on a mold release paper sheet to have a resin METSUKE of about 128 g/m<2> , carbon fiber is paralleled thereon in one direction and impregnated with epoxy resin to obtain a carbon fiber prepreg. The prepregs are laminated in such a manner that the fiber directions intersect each other to reach a thickness of about 10 mm. On a flat mirror finished iron plate, a bleed cloth formed by a mold release film and glass fiber woven fabric is superposed and sealed by a heat resisting back film. This is held under vacuum for designated time, and then heated and pressurized in an auto clave to prepare a fiber reinforced plastic thin plate. Thus, a vibrating material having a vibration loss coefficient of 0.2 or less, for example, about 0.09 is obtained. The material is used to form a hollow golf club head, whereby the impact sound feeling can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a golf club head, and more particularly to a hollow wood type golf club head.

[0002]

2. Description of the Related Art Conventionally, persimmon and the like have been widely used in golf club heads such as a driver, a spoon, and a buffy. When a golf club head is hit with such a golf club head, the sound at the time of hitting is attenuated. It was fast and had low sound pressure. However, in recent years, in order to improve the controllability at the time of hitting and the performance such as the flight distance, such a wood type golf club head has a hollow type made of a metal material such as stainless steel, a titanium alloy, and an aluminum high strength alloy, and has a large volume. Larger ones are becoming mainstream.

[0003]

However, such a hollow type golf club head has a generally high-pitched hitting sound, and is uncomfortable for a user who is accustomed to a conventional golf club head using persimmon or the like. there were. In general, a hollow structure can be said to be a structure that easily vibrates. However, depending on the material, there is a great variation in sound characteristics depending on the material, and the user may feel uncomfortable. The present invention has been made to solve the above-mentioned problem, and has as its object to provide a golf club head capable of generating a comfortable hitting sound.

[0004]

The inventors of the present invention have conducted intensive studies to solve the above-mentioned problems, and as a result, as a golf club head having a refreshing sound effect on the impact sound, a golf club head having a small vibration loss coefficient. The present inventors have found that it is effective to use a material for at least a part thereof, and have reached the present invention.
That is, the golf club head of the present invention is characterized in that a vibration material having a vibration loss coefficient of 0.2 or less is used at least in part. As the vibration material, carbon fiber reinforced epoxy resin is desirable.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The golf club head of the present invention
Part or all of them are formed of a vibration material having a vibration loss coefficient of 0.2 or less. When the vibration loss coefficient is larger than 0.2, the hitting sound becomes high, which is likely to cause discomfort. The smaller the vibration loss coefficient of the vibration material is, the better.
0.09 to 0.15 is more preferable. In the present invention, the vibration loss coefficient is obtained by measuring a vibration waveform according to the U.S. military standard MIL-P-22581B and calculating the following equation.

[0006]

(Equation 1)

In the present invention, the vibration material has a vibration loss coefficient of 0.2.
The material is not particularly limited as long as it is as follows, but is preferably made of a metal material or a composite material. As metal materials, super tough steel, martensite steel, medium carbon 5% Cr steel,
α + β-type titanium alloy, β-type titanium alloy and the like.
Examples of the composite material include various fiber-reinforced materials such as fiber-reinforced metal and fiber-reinforced resin. Examples of the fiber of such a fiber reinforcing material include carbon fiber, glass fiber, aramid fiber, and inorganic fiber, and the form of the fiber includes a unidirectional material, a woven fabric, and a nonwoven fabric. It may be two or more kinds of interwoven materials.

The matrix of the fiber reinforced metal includes aluminum and iron, and the matrix of the fiber reinforced resin is a thermosetting resin such as an unsaturated polyester resin, a vinyl ester resin, an epoxy resin, an acrylic resin or a polyamide resin. The matrix resin may be mixed with a powder of a material having a small attenuation ratio (eg, titanium alloy, glassy carbon, whisker, tungsten carbide, etc.). Among these fiber reinforced materials, carbon fiber reinforced epoxy resin material is desirable because it is a material having a small vibration loss coefficient and a high specific strength.

From the viewpoint of improving the acoustic characteristics, it is desirable that the entire golf club head is made of a vibration material. However, the acoustic characteristics can be improved by partially using the vibration material for the golf club head. When the vibration material is partially used for the golf club head, it is preferable to use the vibration material for the crown portion or the sole portion because the sound improving effect can be remarkably exhibited without impairing the hitting performance of the golf club head. The golf club head of the present invention comprises:
It can be manufactured by applying a well-known general method.

[0010]

Example 1 An epoxy resin cured at 180 ° C. (“# 982 resin” manufactured by Mitsubishi Rayon Co., Ltd.) was rolled on release paper to give a resin weight of 128 g / m ² and carbon fibers ( Fiber weight: 196 g / m ² , “HR40” manufactured by Mitsubishi Rayon Co., Ltd.) was aligned in one direction, and carbon fibers were impregnated with epoxy resin to obtain carbon fiber prepreg (1) having a thickness of 0.18 mm. This carbon fiber prepreg (1)
The layers were alternately laminated at 0 ° and 90 ° until the thickness reached 0 mm and placed on a flat mirror-surface iron plate on which a release film made of polyfluoroethylene was arranged. A release film made of polyfluorinated ethylene and a bleed cloth made of a woven glass fiber fabric were overlaid on top of it, the whole was sealed with a heat-resistant back film, and the inside was evacuated and held for one hour. This was transferred into an autoclave, the temperature was raised to 180 ° C. at a rate of 2 ° C./min, a pressure of 4 kg / cm ² was applied, and the mixture was held for 2 hours.
The temperature was returned to room temperature at 2 ° C./min. The thickness of the fiber reinforced plastic thin plate thus obtained was 9.9 mm. This was processed into a circular shape, and the vibration waveform was measured according to the U.S. military standard MIL-P-22581B. As a result, the vibration loss coefficient is set to 0.
09. Using this fiber reinforced plastic thin plate, a 300 cc hollow golf club head was formed.

Example 2 An epoxy resin cured at 130 ° C. (“# 330 resin” manufactured by Mitsubishi Rayon Co., Ltd.) was rolled on release paper to give a resin basis weight of 75 g / m ² and carbon fibers (fibers). The basis weight: 175 g / m ² , “TR30” manufactured by Mitsubishi Rayon Co., Ltd.) was aligned in one direction, and carbon fibers were impregnated with epoxy resin to obtain carbon fiber prepregs (2) having a thickness of 0.16 mm. This carbon fiber prepreg (2)
The layers were alternately laminated at 0 ° and 90 ° until the thickness became 0 mm, and placed on a flat mirror-finished iron plate on which a release film made of polyfluoroethylene was arranged. A release film made of polyfluorinated ethylene and a bleed cloth made of a woven glass fiber fabric were overlaid on top of it, the whole was sealed with a heat-resistant back film, and the inside was evacuated and held for one hour. This was transferred into an autoclave, heated to 130 ° C. at a rate of 2 ° C./min, applied with a pressure of 4 kg / cm ² , kept for 2 hours, and then returned to room temperature at 2 ° C./min. The thickness of the fiber reinforced plastic thin plate thus obtained was 9.9 mm. This was processed into a circular shape, and the vibration waveform was measured according to the U.S. military standard MIL-P-22581B. As a result, the vibration loss coefficient was 0.13. Using this fiber reinforced plastic thin plate, a 300 cc hollow golf club head was formed.

Example 3 An epoxy resin cured at 130 ° C. (“# 350 resin” manufactured by Mitsubishi Rayon Co., Ltd.) was rolled on release paper to give a resin weight of 128 g / m ² , and a carbon fiber fabric ( Fiber weight: 200 g / m ² , “TR3110” manufactured by Mitsubishi Rayon Co., Ltd.), impregnated with epoxy resin, and carbon fiber prepreg 0.23 mm thick (3)
I got This carbon fiber prepreg (3) is alternately laminated at (0 ° / 90 °) and (90 ° / 0 °) until it has a thickness of 10 mm, and a flat film on which a release film made of polyfluoroethylene is disposed. It was placed on a mirror-surface iron plate. A release film made of polyfluorinated ethylene and a bleed cloth made of a woven glass fiber fabric were overlaid on top of it, the whole was sealed with a heat-resistant back film, and the inside was evacuated and held for one hour. This was transferred into an autoclave and brought to 130 ° C at 2 ° C /
The temperature was raised at a rate of 1 minute, a pressure of 4 kg / cm ² was applied, the temperature was maintained for 2 hours, and the temperature was returned to room temperature at 2 ° C./minute. The thickness of the fiber reinforced plastic thin plate thus obtained was 9.
It was 89 mm. This is processed into a circular shape, and the U.S. military standard MIL-
The vibration waveform was measured according to P-22581B. As a result, the vibration loss coefficient was 0.15. Using this fiber reinforced plastic thin plate, a 300 cc hollow golf club head was formed.

Test Example A hitting test was performed using each of the golf club heads of Examples 1 to 3 and a conventional golf club head made of Persimmon (comparative example), and the hitting sound at that time was evaluated. did. In the test, when 30 golfers were hit, the sensation mainly based on the hitting sound was evaluated in the following three grades, and the average value was obtained. ◎: extremely good, ：: good, Δ: normal The evaluation results are shown in Table 1.

[0014]

[Table 1]

As a result of the test, all golf club heads according to the present embodiment were able to obtain a refreshing and good hitting sound evaluation.

[0016]

According to the golf club head of the present invention,
Although it is a lightweight, large-sized, high-performance hollow-type golf club head, it has an excellent sound effect and emits a refreshing impact sound. It is desirable to use a carbon fiber reinforced epoxy resin as the vibration material, because it has a particularly small vibration loss coefficient and a high specific strength.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yoshiharu Numata 4-1-1 Ushikawadori, Toyohashi-shi, Aichi Prefecture

Claims (2)

[Claims] 1. A golf club head comprising at least a portion of a vibration material having a vibration loss coefficient of 0.2 or less. 2. The golf club head according to claim 1, wherein the vibration material is a carbon fiber reinforced epoxy resin.