JPH119741A - Golf club head casting made of amorphous Zr alloy - Google Patents

Abstract

[PROBLEMS] To provide an amorphous Zr alloy golf club head casting having high strength and low elastic modulus. SOLUTION: A golf club head casting is made at atomic%,
Cu: 10 to 32%, Al: 3 to 15%, Ni: 5-1
5%, Sn: 0.3 to 1.4%, Fe: 0.02 to 1
%, Cr: 0.02 to 1%, and, if necessary, Ti: 0.1 to 10%, with the balance being Zr and unavoidable impurities, and the whole being amorphous (Amorphous), or an amorphous Zr alloy having a structure in which 50% by area or more is amorphous and the remainder is crystalline.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a golf club head casting made of an amorphous Zr alloy having a high strength and a low elastic modulus.

[0002]

2. Description of the Related Art In general, golf club head castings such as stainless steel castings and Ti alloy castings have been widely known.

[0003]

On the other hand, there is a strong demand for golf club heads to be lighter and thinner, and golf club heads always have a long flight distance and directional stability of hit balls as eternal issues. Therefore, development of a golf club head casting having higher strength and lower elastic modulus is desired.

[0004]

Means for Solving the Problems Accordingly, the present inventors have
From the above-mentioned viewpoints, as a result of researching to develop a golf club head casting having a higher strength and a lower elastic modulus, the golf club head casting was converted to an atomic% (hereinafter, simply referred to as atomic%). Cu: 10 to 32%, Al: 3 to 15%, Ni: 5 to 15%, Sn: 0.3 to 1.4%, Fe: 0.02 to 1%, Cr: 0.02 And, if necessary, a composition containing Ti: 0.1 to 10%, with the balance being Zr and unavoidable impurities, and the whole being amorphous or having an area of 50%. % Or more, and the remainder is composed of an amorphous Zr alloy having a crystalline structure.
All alloy golf club head castings have been widely used in the past, for example, those made of stainless steel specified in JIS / SCS24, and Ti-6 wt% Al-4.
The strength is remarkably higher than that of a Ti alloy having a composition of% by weight V, which makes it possible to further reduce the weight and thickness, and furthermore, the elastic modulus is such that the main body of the structure is amorphous. It is relatively low in combination with this, and the research result that the hitting distance of the hit ball is increased and the directional stability is further improved is obtained.

The present invention has been made on the basis of the above-mentioned research results, wherein Cu: 10 to 32%, Al: 3 to 15%, Ni: 5 to 15%, Sn: 0.3 to 1. 4%, Fe: 0.02 to 1%, Cr: 0.02 to 1%, and if necessary, Ti: 0.1 to 10%, with the balance being Zr and inevitable impurities. And a high-strength and low-strength alloy composed of an amorphous Zr alloy having a composition consisting of The present invention is characterized by an amorphous Zr alloy golf club head casting having an elastic modulus.

Next, the reason why the composition of the amorphous Zr alloy constituting the golf club head casting of the present invention is limited as described above will be described. (A) Cu and Al Both of these components have the effect of forming an amorphous phase in the coexistence of the Zr and Ni components, improving the strength, and reducing the elastic modulus. In any of the above, if Cu: less than 10% and Al: less than 3%, the ratio of amorphous becomes less than 50 area%, and the desired strength improving effect and elastic modulus reducing effect are not exhibited. Cu: 32% for both Cu and Al,
If the content of Al exceeds 15%, the ability to form an amorphous material is reduced, and the proportion of the amorphous material is less than 50% by area. １５15%. Preferably, Cu: 14 to 24
%, Al: preferably 7 to 12%.

(B) Ni The Ni component also forms an amorphous phase in the coexistence of Zr, Cu and Al to improve the strength and reduce the elastic modulus, and also has the effect of improving the castability. However, if the content is less than 5%, a desired improvement effect on the above-mentioned effect cannot be obtained, while if the content exceeds 15%, the ability to form an amorphous phase is suppressed, and The content was determined to be 5 to 15%, preferably 8 to 12%.

(C) Sn The Sn component has the effect of reducing the modulus of elasticity and improving the castability together with Ni. If its content is less than 0.3%, the desired effect of the above effect is obtained. On the other hand, if the content exceeds 1.4%, the strength will decrease, so the content is 0.3 to 1.4%, preferably 0.5 to 1.0%. I decided.

(D) Fe and Cr Both of these components have the effect of improving the strength by coexistence.
If the content is less than 2%, the desired strength-improving effect cannot be obtained, and if the content exceeds 1% for both Fe and Cr, the elastic modulus increases and the castability is impaired. , The content of which is Fe: 0.
02-1%, desirably 0.1-0.4%, Cr: 0.
02-1%, desirably 0.07-0.3%.

(E) Ti The Ti component has an effect of further improving the strength, and is therefore contained as necessary.
If the content is less than 10%, the desired effect of improving strength cannot be obtained. On the other hand, if the content exceeds 10%, the elastic modulus increases, so that the content is 0.1 to 10%, preferably 2 to 10.
8%.

[0011] Similarly, the amorphous ratio in the amorphous Zr alloy is defined as 50% by area or more. However, if the ratio is less than 50% by area, the desired strength improving effect and elastic modulus reducing effect can be obtained. Is no longer possible. Further, the amorphous in the amorphous Zr alloy is formed by the coexistence of the Zr, Cu, Al, and Ni components as described above, and the ratio of 50% by area or more thereof is mainly based on the content of the four components. It can be adjusted to a predetermined ratio by the casting temperature of the molten alloy and the cooling rate after casting.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Next, a golf club head casting according to the present invention will be described in detail with reference to examples. Using an ordinary vacuum melting furnace, Z having the component composition shown in Table 1 was used.
r alloy melts are prepared and these
Casting in a water-cooled copper mold at a predetermined casting temperature in the range of ° C. In this case, the cooling rate of the water-cooled copper mold is controlled by adding a cooling rate of the water-cooled copper mold in order to control the proportion of amorphous in addition to the composition and the casting temperature. By controlling the temperature and cooling while controlling variously, it is composed of an amorphous Zr alloy and has a diameter of 18 m.
Golf club head casting materials of the present invention (hereinafter referred to as head casting materials of the present invention) 1 to 16 having dimensions of mx length: 170 mm were produced, respectively.

For comparison purposes, the composition of the molten metal
% By weight, C: 0.032%, Si: 0.34%, M
n: 0.52%, P: 0.013%, S: 0.021
%, Ni: 3.92%, Cr: 16.68%, Cu:
3.46%, Nb: 0.39%, the balance being Fe
Stainless steel consisting of steel and other unavoidable impurities (JIS
G5121, SCS24) under the same conditions except that the casting temperature is set to 1600 ° C. and the amount of cooling water of the water-cooled copper mold is kept constant. Material S) was manufactured. Further, for the purpose of comparison, the component composition of the molten metal was changed to 6.03% by weight of Al, 4.12% by weight of V,
Under the same conditions, except that Ti and inevitable impurities: remaining, the casting temperature is 1650 ° C., and the amount of cooling water in the water-cooled copper mold is kept constant, a conventional Ti alloy golf club head casting material (hereinafter, referred to as conventional) A head casting material T) was manufactured.

From the various head casting materials obtained as a result, test specimens specified in JIS Z2201 (parallel diameter: 6 mm) are cut out, and a tensile test is performed based on JIS Z2241 to measure the yield strength. And the strength was evaluated.
Also, width: 4 mm x length: 3 mm x length: 40 mm
Was cut out, the Young's modulus was measured by a transverse vibration resonance method based on JIS Z2280, and the elastic modulus was evaluated. Table 2 shows the results of these measurements. Table 2 shows the respective amorphous ratios of the head casting materials 1 to 16 of the present invention. This amorphous ratio is obtained by observing an arbitrary portion with an optical microscope (100 times) and measuring the amorphous ratio in the structure photograph using an image analyzer. As shown.

[0015]

[Table 1]

[0016]

[Table 2]

[0017]

According to the results shown in Table 3, all of the head casting materials 1 to 16 of the present invention have a higher strength than the conventional head casting material S and the conventional head casting material T, and furthermore have an elastic modulus. It is clear that it is low. As described above, the golf club head casting of the present invention has a high strength and is made of an amorphous Zr alloy having a low elastic modulus, so that it can only be reduced in weight and thickness. In addition, it is possible to further increase the flight distance and directional stability of the hit ball, and to have excellent performance.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Noboru Yonezawa 1230 Kamijiya, Okegawa-shi, Saitama Mitsubishi Materials Corporation Okegawa Works

Claims (2)

[Claims] 1. Atomic%, Cu: 10 to 32%, Al: 3 to 15%, Ni: 5 to 15%, Sn: 0.3 to 1.4%, Fe: 0.02 to 1%, A composition comprising Cr: 0.02 to 1%, with the balance being Zr and unavoidable impurities, and a structure in which the whole is amorphous or 50% or more is amorphous and the remainder is crystalline. A golf club head casting made of an amorphous Zr alloy, comprising an amorphous Zr alloy. 2. Atomic%, Cu: 10 to 32%, Al: 3 to 15%, Ni: 5 to 15%, Sn: 0.3 to 1.4%, Fe: 0.02 to 1%, Cr: 0.02 to 1%, and further, Ti: 0.1 to 10%, the balance being Zr and unavoidable impurities, and the whole being amorphous or at least 50 area%. Characterized in that the golf club head casting is made of an amorphous Zr alloy having an amorphous Zr alloy having the following structure: