JPH09253251A - Golf club head - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve flying range for an iron based golf club head by forming the head using a monmagnetic steel containing Mn and C each at a rate of specified wt.% and iron and inevitable impurities for the rest. SOLUTION: A golf club head is formed using nonmagnetic steel made in a composition of containing 10-32wt.% of Mn and 0.1-1wt.% of C and iron and inevitable impurities for the rest. The nonmagnetic steel is melted in vacuum and the molten steel obtained is precision cast. The surface of the work is ground and the face surface thereof is finished by sand blasting to produce a club head. In the nonmagnetic steel 1-20wt.% of Cr may be contained. Moreover, it is also possible to add 1-10wt.% of Ni in place of Cr and to add both of the Cr and Ni. One or two of Si and V may be added at a rate of 0.1-3wt.%.

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 (including an iron head and a metal wood head) capable of flying a golf ball farther than ever before and having an excellent flight distance.

[0002]

2. Description of the Related Art Generally, a golf club head has an 18C
It is known that there are iron-based golf club heads made of r-8Ni stainless steel or mild steel and titanium-based golf club heads made of titanium alloy. These golf club heads are firmly joined to the tip of the shaft and are used as golf clubs.

[0003]

In general, a golf club hits a golf ball as accurately as possible as far as possible, thereby obtaining a feeling of excitement and satisfaction. Therefore, in general, the golf ball is as far away as possible. There is a demand for a golf club that can fly to a long distance. In order to meet this demand, the shape and structure of the golf club head has been improved to increase the flight distance, and further improvements have been constantly made to improve the flight distance by improving the material of the club head. For example, in a titanium-based golf club head made of a titanium alloy having a small specific gravity, a balance weight is attached to the tip of the golf club head to move the center of gravity of the head near the sole surface to extend the flight distance. However, since the titanium alloy itself is expensive, the golf club with the titanium-based golf club head has a drawback that the price is high, and the inexpensive iron-based golf club head has a large specific gravity of 18Cr-8Ni stainless steel or mild steel. However, the effect of the improvement of the shape structure by moving the center of gravity of the head has reached its limit, and it has been required to improve the flight distance by improving the material of the iron-based golf club head.

[0004]

Means for Solving the Problems Accordingly, the present inventors have:
From such a viewpoint, as a result of research to obtain an iron-based golf club head having a farther flight distance than that of a conventional iron-based golf club head made of 18Cr-8Ni stainless steel or mild steel, as a result, 18Cr-8Ni stainless steel or mild steel was obtained. An iron-based golf club head made of non-magnetic steel having a low internal wear value, a small Young's modulus and a low magnetic permeability can further increase the flight distance of a golf ball as compared with a conventional iron-based golf club head. As steel, M
n: 10 to 32% by weight, C: 0.1 to 1% by weight, and if necessary, Cr: 1 to 20% by weight, Ni: 1 to 1%
10% by weight of one or two, and optionally one or two of Si and V: 0.1
It has been found that a non-magnetic steel having a composition of ˜3 wt% and the balance of Fe and inevitable impurities is preferable.

The present invention has been made on the basis of such findings, and (1) Mn: 10 to 32% by weight,
C: golf club head made of non-magnetic steel containing 0.1 to 1% by weight, the balance being Fe and inevitable impurities, (2) Mn: 10 to 32% by weight, C:
A golf club head made of non-magnetic steel containing 0.1 to 1% by weight and Cr: 1 to 20% by weight, with the balance being Fe and inevitable impurities, (3) Mn: 10.
Up to 32% by weight, C: 0.1 to 1% by weight, Ni: 1 to 10
A golf club head made of non-magnetic steel having a composition comprising wt% and the balance being Fe and inevitable impurities;
(4) A composition containing 10 to 32% by weight of Mn, 0.1 to 1% by weight of C, 1 to 20% by weight of Cr and 1 to 10% by weight of Ni, and the balance of Fe and inevitable impurities. A golf club head made of non-magnetic steel having (5) M
n: 10 to 32% by weight, C: 0.1 to 1% by weight, Si:
A golf club head made of non-magnetic steel having a composition of 0.1 to 3 wt% and the balance of Fe and inevitable impurities, (6) Mn: 10 to 32 wt%, C: 0.
1 to 1% by weight, Cr: 1 to 20% by weight, Si: 0.1
A golf club head made of non-magnetic steel containing 3% by weight and the balance being Fe and inevitable impurities, (7) Mn: 10 to 32% by weight, C: 0.1 to 1
A golf club head made of non-magnetic steel having a composition of 1% by weight, Ni: 1 to 10% by weight, Si: 0.1 to 3% by weight, the balance being Fe and inevitable impurities.
(8) Mn: 10 to 32% by weight, C: 0.1 to 1% by weight, Cr: 1 to 20% by weight, Ni: 1 to 10% by weight, S
i: a golf club head made of non-magnetic steel having a composition of 0.1 to 3 wt% and the balance of Fe and inevitable impurities, (9) Mn: 10 to 32 wt%, C:
A golf club head made of non-magnetic steel having a composition of 0.1 to 1% by weight, V: 0.1 to 3% by weight, and the balance of Fe and inevitable impurities, (10) Mn: 10
Up to 32% by weight, C: 0.1 to 1% by weight, Cr: 1 to 20
%, V: 0.1 to 3% by weight, the balance being made of non-magnetic steel having a composition of Fe and inevitable impurities, (11) Mn: 10 to 32% by weight, C: 0. 1 to 1% by weight, Ni: 1 to 10% by weight,
V: 0.1 to 3% by weight, the balance consisting of Fe and non-unavoidable impurities in a non-magnetic steel golf club head, (12) Mn: 10 to 32% by weight, C:
0.1 to 1% by weight, Cr: 1 to 20% by weight, Ni: 1 to 1
10% by weight, V: 0.1 to 3% by weight, the balance is F
a golf club head made of non-magnetic steel having a composition of e and inevitable impurities, (13) Mn: 10-32
% By weight, C: 0.1 to 1% by weight, sum of Si and V:
A golf club head made of non-magnetic steel containing 0.1 to 3 wt% and the balance being Fe and inevitable impurities, (14) Mn: 10 to 32 wt%, C: 0.
Golf club head made of non-magnetic steel having a composition of 1 to 1% by weight, Cr: 1 to 20% by weight, the total of Si and V: 0.1 to 3% by weight, and the balance of Fe and inevitable impurities. , (15) Mn: 10 to 32% by weight,
C: 0.1 to 1 wt%, Ni: 1 to 10 wt%, total of Si and V: 0.1 to 3 wt%, balance: Fe
And (16) Mn: 10 to 32% by weight, C: 0.1 to 1% by weight, Cr: 1 to 20% by weight,
Ni: 1 to 10% by weight, sum of Si and V: 0.1
The golf club head is made of non-magnetic steel containing 3% by weight and the balance of Fe and inevitable impurities.

In the golf club head of the present invention, the non-magnetic steel having the composition shown in (1) to (16) above is vacuum melted, the resulting molten metal is precision cast, the surface is polished, and then the face surface is polished. Can be manufactured by sandblasting and finishing. Further, the molten metal obtained by melting the non-magnetic steel having the component composition shown in (1) to (16) above is cast in a mold to produce a non-magnetic steel ingot, and the non-magnetic steel ingot is rod-shaped. It can also be manufactured by forging into the shape of a golf club head, then polishing the surface, and then sandblasting the face surface to finish.

Next, the reason why the composition of the non-magnetic steel constituting the golf club head of the present invention is limited as described above will be explained.

(A) Mn Mn has an action of lowering the internal wear value, Young's modulus and magnetic permeability, but if its content is less than 10% by weight, its effect is not sufficient, while 32% by weight is required. If it is contained in excess, it is not preferable because the oxidation resistance decreases. Therefore, the Mn content is set to 10 to 32% by weight.
A more preferable range is 15 to 20% by weight.

(B) C C has the effect of improving the strength of non-magnetic steel, but if its content is less than 0.1% by weight, its effect is not sufficient.
On the other hand, if the content exceeds 1% by weight, cracking occurs during forging at high temperature, which is not preferable as a material for a golf club head. Therefore, the C content is 0.1 to 1
Weight% is set. A more preferable range of the C content is 0.
It is 4 to 0.8% by weight.

(C) Cr Since Cr forms a carbide and further improves the strength, it is added if necessary, but if the content is less than 1% by weight, the effect is not sufficient, while on the other hand, 20% by weight. If it is contained in excess of 1.0, the forgeability deteriorates, which is not preferable. Therefore, the Cr content is set to 1 to 20% by weight. A more preferable range is 1 to 5% by weight.

(D) Ni Since Ni has a function of refining the base material of the non-magnetic steel forming the golf club head, it is added if necessary, but if the content is less than 1% by weight, the effect is sufficient. On the other hand, even if the content exceeds 10% by weight, no significant change is observed in the internal wear value.
It was set to 10% by weight. A more preferable range of the Ni content is 1 to 2% by weight.

(E) Si and V Si and V both have the effect of improving the oxidation resistance of non-magnetic steel and further reducing the internal wear value, Young's modulus and magnetic permeability to extend the flight distance of a golf ball. The effect is not sufficient if the content is less than 0.1% by weight, while V is high in V ₂ O ₅ vapor pressure even if the content is more than 3% by weight. Therefore, there is no point in adding it because it evaporates at high temperature, and Si forms a precipitation phase, which is not preferable. Therefore, the content of one or two of Si and V is set to 0.1 to 3% by weight.
A more preferable range of the content of one or two of Si and V is 0.2 to 1% by weight.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION A test piece is produced by precision casting or forging non-magnetic steel, 18Cr-8Ni stainless steel and mild steel having the compositions shown in Tables 1 to 42,
Using this test piece, Young's modulus and internal wear value were measured using the device used in the bending resonance method defined by the high temperature elastic modulus test method of fine ceramics defined by JIS R 1605, and further specified by JIS C 2550. The magnetic permeability of the non-magnetic steel, 18Cr-8Ni stainless steel and mild steel having the component compositions shown in Tables 1 to 42 was measured by the method described above, and the results are shown in Tables 1 to 42.

Next, non-magnetic steel, 18Cr-8Ni stainless steel and mild steel having the compositions shown in Tables 1 to 42 are precision cast or forged to finish into a golf club head shape, and then the surface is polished, The golf club heads of the present invention (hereinafter referred to as the present invention heads) 1 to 344 and conventional heads 1 to 4 were produced by sandblasting the face surface.

The heads 1 to 344 of the present invention and the conventional heads 1 to 4 are attached to a 40-inch shaft to prepare a golf club, and the golf club is 40 m / sec.
The golf ball was mounted on a test device for hitting a golf ball at the speed of, and the hitting test was conducted to measure the flight distance of the golf ball. The results are shown in Tables 1 to 42.

[0016]

[Table 1]

[0017]

[Table 2]

[0018]

[Table 3]

[0019]

[Table 4]

[0020]

[Table 5]

[0021]

[Table 6]

[0022]

[Table 7]

[0023]

[Table 8]

[0024]

[Table 9]

[0025]

[Table 10]

[0026]

[Table 11]

[0027]

[Table 12]

[0028]

[Table 13]

[0029]

[Table 14]

[0030]

[Table 15]

[0031]

[Table 16]

[0032]

[Table 17]

[0033]

[Table 18]

[0034]

[Table 19]

[0035]

[Table 20]

[0036]

[Table 21]

[0037]

[Table 22]

[0038]

[Table 23]

[0039]

[Table 24]

[0040]

[Table 25]

[0041]

[Table 26]

[0042]

[Table 27]

[0043]

[Table 28]

[0044]

[Table 29]

[0045]

[Table 30]

[0046]

[Table 31]

[0047]

[Table 32]

[0048]

[Table 33]

[0049]

[Table 34]

[0050]

[Table 35]

[0051]

[Table 36]

[0052]

[Table 37]

[0053]

[Table 38]

[0054]

[Table 39]

[0055]

[Table 40]

[0056]

[Table 41]

[0057]

[Table 42]

[0058]

From the results shown in Tables 1 to 42, all of the heads 1 to 344 of the present invention are made of a material having lower internal wear value, Young's modulus and magnetic permeability than the conventional heads 1 to 4. From this, it can be seen that the flight distance of the golf ball is extended.

As described above, the iron-based golf club head of the present invention made of non-magnetic steel having low internal wear value, Young's modulus and magnetic permeability has a flight distance as compared with the conventional iron-based golf club head. It is possible to provide an inexpensive golf club capable of extending and flying a golf ball farther than ever.

Claims (5)

[Claims] 1. Mn: 10 to 32% by weight, C: 0.1
A golf club head comprising 1% by weight and the balance being non-magnetic steel having a composition of Fe and inevitable impurities. 2. Mn: 10 to 32% by weight, C: 0.1
1 wt%, Cr: 1 to 20 wt%, balance Fe
And a non-magnetic steel having a composition of unavoidable impurities. 3. Mn: 10 to 32% by weight, C: 0.1
1 wt%, Ni: 1 to 10 wt%, balance Fe
And a non-magnetic steel having a composition of unavoidable impurities. 4. Mn: 10 to 32% by weight, C: 0.1
A golf club head comprising 1% by weight, Cr: 1 to 20% by weight, Ni: 1 to 10% by weight, and the rest being a non-magnetic steel having a composition of Fe and inevitable impurities. 5. One or two of Si and V:
A composition comprising 0.1 to 3% by weight,
A golf club head comprising the non-magnetic steel described in 3 or 4.