JP2999387B2 - Titanium alloy golf club head 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 golf club head made of metal such as metal wood and the like, and more particularly to a golf club head made of a titanium alloy having few welding points and excellent in durability and manufacturability. And its manufacturing method.

[0002]

2. Description of the Related Art A so-called metal wood golf club head (hereinafter referred to as a golf club head) has been manufactured by a precision casting method using stainless steel, aluminum alloy, titanium alloy or beryllium-copper alloy as a material. In particular, titanium alloy is lightweight and excellent in strength, and has been put to practical use as a golf club head because of its superiority of so-called high specific strength. As a type of the titanium alloy used in the precision casting method, for example, there is a Ti-6Al-4V alloy which is an α + β type Ti alloy.

[0003] However, titanium alloys are inferior in castability typified by the fluidity of the molten metal. for that reason,
Golf club heads made of a titanium alloy manufactured by the precision casting method have casting defects such as minute porosity. And if this casting defect exists more than a fixed amount, it will be regarded as a defective product. A golf club head made of a titanium alloy by a precision casting method has a high probability of becoming such a defective product, and has a problem that the product yield is reduced. Further, the golf club head is brittle because the metal structure is a cast structure,
Further, it has a drawback that it is inferior in mechanical properties such as durability and tensile strength.

[0004] In order to solve the problem of the titanium alloy golf club head by such a precision casting method, a titanium golf club head by plastic working in hot or cold has been proposed. However, titanium alloys generally have poor plastic workability. That is, the deformation resistance during plastic working is high and the ductility is low. Therefore, there is a problem that a large force is required for the plastic working of the titanium alloy, and cracks are easily generated during the plastic working.

[0005] Indeed, the plastic workability of titanium alloys generally improves at high temperatures. That is, when the plastic working temperature is increased, the force required for the deformation is small, and the ductility is also increased. Therefore, when paying attention only to the plastic working surface, the titanium alloy can be formed at a high working degree by performing plastic working at a high temperature, and it can be formed into a complicated shape. it can. However, since the titanium alloy is extremely active against oxygen and nitrogen, it is not desirable to increase the heating temperature and the heat treatment temperature.

Therefore, for example, Japanese Patent Application Laid-Open No. 5-15620 discloses a golf club head made of a titanium alloy manufactured by cold pressing (hereinafter referred to as prior art 1).

The above publication discloses that a golf club head is divided into a plurality of constituent members, and these constituent members are formed by working a material made of a β-type titanium alloy by a cold pressing method.
Then, a titanium alloy golf club head manufactured by assembling the above components and welding the butted portion is disclosed.

FIG . 4 is a schematic perspective view showing an assembly state of components of the golf club head described in the prior art 1. In the figure, 1 is a face portion, 2 is a crown portion, 3 is a fossil portion, and 4 is a sole portion.

According to the prior art 1, the welding portions of the components of the golf club head are, for example, in the example of FIG. 4 , the joining surface between the face portion 1, the crown portion 2 and the sole portion 4, It is the joint surface between the crown and the sole, and the butted portion of the foresell 3 with the face 1 and the crown 2, for a total of five locations.

Japanese Patent Application Laid-Open No. Hei 5-317467 discloses a metal golf ball in which a face part, a part of a crown part, a part of a sole part, and a foresell part are integrally formed by forging. A club head (hereinafter referred to as Prior Art 2) is described.

FIG . 5 is a schematic perspective view showing a state of assembling components of the golf club head described in the above publication. In the drawing, reference numeral 7 denotes a face side member, which comprises a face portion 1, a portion 2a of a crown portion 2, a portion 4a of a sole portion 4 and a foresle portion 3, and 8 Is a back side member, which comprises another portion 2b of the crown portion 2 and another portion 4b of the sole portion 4. Reference numeral 9b denotes an abutting portion between the foresell portion 3 and the crown portion 2.

The above publication discloses that a metal plate having a predetermined shape is roughly formed and then formed into a “face-side member 7” by forging, while another metal plate having a predetermined shape is formed as a “back-side member”. No. 8 ", a metal golf club head manufactured by assembling these two members and welding the butted portion is disclosed.

According to the prior art 2, the welding portion of the components of the golf club head is a butt portion between the face side member 7 and the back side member 8, as is apparent from FIG. The wire is long, and a butt portion 9b of the foresell portion 3 and the crown portion 2, which is an important portion for the durability of the golf club, is joined by welding.

Japanese Utility Model Publication No. 61-33971 discloses a two-part golf club head (hereinafter referred to as prior art 3) in which the constituent members of the head body are composed of a front shell portion and a rear shell portion. ing. However, in the prior art 3, the foresel portion that is most impacted when hitting a golf ball is formed by butt-welding the “rear neck half portion” and the “front neck half portion”, and the welding line is reduced. 2
In order to form a book, a shaft mounting pipe is used as a constituent member, and the head body and the shaft mounting pipe are joined by welding. In addition, 61-339
No. 70 and Japanese Utility Model Publication No. 60-30453,
A three-part golf club head is disclosed. However, since a reinforcing member for connecting and reinforcing the face portion, the crown portion and the sole portion with each other and a pipe for attaching a shaft are included in the interior of the head body, the structure and the manufacturing process Is complicated. Also,
JP-A-63-154186 discloses a golf club head in which a plurality of Ti-6Al-4V titanium alloy shells are integrally joined to each other to form a hollow head body. However, in the invention of the same publication, the following points are required, that is, water cooling is required after forging of the titanium alloy, so that dimensional deviation and deformation may occur due to thermal distortion. Since the forging temperature is 900 ° C. or higher, oxidation is performed. , The hot workability is poor, and it is easy to crack, so that the shape of the molded product tends to cause a problem. Therefore, there is a problem that the optimum forging condition range is narrowed, and the degree of freedom in design cannot be increased.

[0015]

The above-mentioned prior art has the following problems. Prior Art 1 discloses a method in which a plurality of components made of a β-type titanium alloy are formed by cold working, combined, and an integrated golf club head is manufactured by welding a butt portion. The constituent members are a face part, a crown part,
Since it covers four parts, the sole part and the foreel part, as described above, many parts such as five must be welded. Further, the β-type titanium alloy is inferior in weldability to the α + β-type titanium alloy, and the metal properties (the ductility and the state of crystal grains) in the welded portion of the above-mentioned constituent members have been homogenized by plastic working. Therefore, when the golf club head is used, the durability at the welded portion is inferior.

In particular, there is a problem in the durability of the golf club, which is required to have high toughness in terms of durability, because the fuselage, the crown and the face are jointed by welding. In addition, since there are many welding points and the length of the welding line is long, the shape of the golf club head may be defective due to welding distortion. Further, there is a problem that the cost is increased due to an increase in the number of welding steps. In the prior art 1, since the titanium alloy material, which is a constituent member of the golf club head, is formed by cold working, it is difficult to perform forming with a large working degree, and a constituent member having a complicated shape is obtained. Is difficult.

In the prior art 2, since the number of constituent members of the golf club head is as small as two, the problems associated with the execution of welding are improved as compared with the prior art 1. However, in the method of forming the foresell portion in Prior Art 2, a plate-like material is formed into a cylindrical shape, and then the butted portion is formed by seam welding. Therefore, there is a problem that one seam-like welding line still remains in the fuselage. In addition, since the length of the welding line is long, the problem of poor shape generation due to welding distortion remains, and
A golf club that requires particularly toughness in terms of golf club durability
Since the shell portion and the crown portion are joined by welding, there is a problem in durability. In addition, there is no disclosure of a titanium alloy as a metal plate used for manufacturing a golf club head, but only disclosure of a low alloy steel. Therefore, in Prior Art 2, it is not possible to solve the problem that occurs when the titanium alloy is inferior in hot workability.

As described above, the plastic workability of a titanium alloy is improved at a high temperature, so that the force required for the plastic work is small, and the ductility is improved, so that the workability can be increased. It can be formed into a part having a more complicated shape. Therefore, if oxidation and nitridation of the titanium alloy material at a high temperature can be prevented, it becomes possible to manufacture a golf club head that is close to an integrated material. However, it is industrially difficult to control oxidation and nitridation to a substantially harmless degree by controlling the atmosphere in the heating and forging steps of the titanium alloy material. When the heating and forging temperature exceeds 900 ° C., oxidation and nitridation of the titanium alloy become remarkable.

Although β-type titanium alloys are excellent in cold workability among titanium alloys, it is extremely difficult to form a complex shape such as a golf club head by cold working. However, even in the case of a β-type alloy, the head is divided into multiple parts and formed by hot forging. In recent golf club heads, large golf club heads having a capacity of 220 cc or more provided with a wide sweet spot have been manufactured in order to improve the flight distance and the accuracy of flying balls. As a result, the head weight of conventional materials increases as the size of the golf club head increases, so that high specific strength of the material is important. In the case of β-type alloys, only about 80-90 kg / mm ² of strength can be obtained with hot forging and the rigidity is low, so the high specific strength and high specific rigidity expected of titanium alloys can be achieved with β-type titanium alloy golf. In order to give it to a club head, it must be subjected to solution treatment and aging treatment after forging. In addition, high strength requires a long time aging of about 8 to 15 hours after solution treatment and air cooling, and there is a problem that heat treatment requires a long time. In addition, in increasing the strength of a typical α + β-type Ti-6Al-4V alloy, water cooling is indispensable in the solution treatment before aging treatment, and the influence on the dimensional accuracy and deformation due to thermal strain become a problem.

Accordingly, an object of the present invention is to solve the above-mentioned problems and to reduce the number of welded parts by using a titanium alloy material which can be formed into a part having a complicated shape by plastic working. By obtaining the components of a golf club head, it is excellent in manufacturability, durability, shape and dimensional accuracy, can easily maintain the surface of the molded body after hot working, and has high specific strength and high specific rigidity. It is an object of the present invention to provide a titanium alloy golf club head which can be easily provided and a method of manufacturing the same.

[0021]

SUMMARY OF THE INVENTION The present invention optimizes the chemical composition of a titanium alloy used as a material for a golf club head, and optimizes the shape of a component of a golf club head formed from the material. It was achieved by doing so.

The feature of the titanium alloy golf club head according to the present invention is that the golf club head comprises a face portion, a fuselage portion, a crown portion and a sole portion. A head main member (T1) integrally formed with a shell portion, and one or two members including a crown portion and a sole portion formed independently of the head main member (T1). And other parts adjacent to the assembly except for the part where the face part and the foresell part are adjacent to each other are joined by welding, and at least the head main member (T1) is , Α + β type titanium alloy, the following formula (1): Mo _eq (wt.%) = Mo (wt.%) + 0.67 × V (wt.%) + 0.44 × W (wt.%) + 0 .28 × Nb (wt.%) + 0.22 × T (Wt.%) + 2.9 × Fe (wt.%) + 1.6 × Cr (wt.%) + 1.1 × Ni (wt.%) + 1.4 × Co (wt.%) + 0.77 × Cu (Wt.%)-Al (wt.%) -------------------- Molybdenum equivalent calculated by (1): Mo _eq (wt.%) It is characterized by having a chemical component composition having a value within the range of 2 to 10 (hereinafter, referred to as a first invention).

The features of the titanium alloy golf club head according to the present invention include a face portion, a crown portion and a fore portion.
A main head member (T2) integrally formed with a shell portion,
A head member (T2) and an assembling butt portion of the head member are welded to each other, and the crown portion is formed by welding. Is a golf club head formed at least continuously from the upper portion of the face portion toward the rear thereof, and at least the head main body member (T2) is an α + β type titanium alloy; 1) Equation: Mo _eq (wt.%) = Mo (wt.%) + 0.67 × V (wt.%) + 0.44 × W (wt.%) + 0.28 × Nb (wt.%) + 0. 22 x Ta (wt.%) + 2.9 x Fe (wt.%) + 1.6 x Cr (wt.%) + 1.1 x Ni (wt.%) + 1.4 x Co (wt.%) + 0. 77 × Cu (wt.%)-Al (wt.%) --- Molybdenum equivalent calculated by (1): Mo _eq (wt. % )of But those characterized by having a chemical composition within the range of 2 to 10 (hereinafter, second that the invention) is.

Another feature of the titanium alloy golf club head according to the present invention is that a head main member (T3) in which a face portion, a sole portion, and a fuel portion are integrally formed.
And a crown member formed of a crown portion, wherein an assembly butting portion of the main head member (T3) and the crown member is joined by welding, and the sole portion is at least The face
A golf club head formed continuously from the lower portion of the golf club head toward the rear thereof, wherein at least the head main member (T3) is an α + β type titanium alloy, and the following formula (1): Mo _eq (wt.%) = Mo (wt.%) + 0.67 × V (wt.%) + 0.44 × W (wt.%) + 0.28 × Nb (wt.%) + 0.22 × Ta (wt .%) + 2.9 × Fe (wt.%) + 1.6 × Cr (wt.%) + 1.1 × Ni (wt.%) + 1.4 × Co (wt.%) + 0.77 × Cu (wt .%)-Al (wt.%) -------------------- Molybdenum equivalent calculated by (1): _Moeq (wt.%) The present invention is characterized by having a chemical component composition within the range of 2 to 10 (hereinafter, referred to as a third invention).

A further desirable feature of the titanium alloy golf club head according to the present invention (hereinafter referred to as a fourth invention) is that the chemical composition of the head main members (T1, T2 and T3) is aluminum (Al): 3. ~ 5 wt.
%, Vanadium (V): 2.1 to 3.7 wt.%, Molybdenum (Mo): 0.85 to 3.15 wt.%, Iron (Fe): 0.85 to 3.15 wt.%, And contains oxygen (O): 0.06 to 0.2 wt.%, And the content of V, Fe and Mo is expressed by the following formula (2): 7 wt.% ≦ 0.67 × V (wt .%) + 2.9 × Fe (wt.%) + Mo (wt.%) ≦ 13 wt.% ------ (2), and the balance consists of titanium and inevitable impurities.
The invention comprises the invention described in the first, second or third invention.

In the method for manufacturing a golf club head according to the present invention, a head main member (T1) in which a face portion and a fuselage portion are integrally formed by using a bar, is formed by hot working; Using a plate or a bar, one or two other members including a crown portion and a sole portion formed independently of the main member (T1) are formed by hot working, and The main head member (T
1) A method for manufacturing a golf club head in which an assembled butted portion of the other member and the other member is joined by welding, wherein at least a material of the head main member (T1) is an α + β type titanium alloy; 1) Equation: Mo _eq (wt.%) = Mo (wt.%) + 0.67 × V (wt.%) + 0.44 × W (wt.%) + 0.28 × Nb (wt.%) + 0. 22 x Ta (wt.%) + 2.9 x Fe (wt.%) + 1.6 x Cr (wt.%) + 1.1 x Ni (wt.%) + 1.4 x Co (wt.%) + 0. 77 × Cu (wt.%)-Al (wt.%) --- Molybdenum equivalent calculated by (1): Mo _eq (wt. %) Is characterized by being manufactured by using a rod having a chemical composition within the range of 2 to 10 (hereinafter referred to as a fifth invention).

In the method of manufacturing a golf club head according to the present invention, a head main member (T2) in which a face portion, a crown portion and a fuselage portion are integrally formed by hot working using a bar. , And using a plate or bar,
A golf club head is formed by hot working to form a sole member formed of a sole portion, and then joining a butted portion of the head main member (T2) and the sole member by welding. In the manufacturing method, at least the material of the head main member (T2) is an α + β type titanium alloy, and the following formula (1): Mo _eq (wt.%) = Mo (wt.%) + 0.67 × V (wt.%) + 0.44 × W (wt.%) + 0.28 × Nb (wt.%) + 0.22 × Ta (wt.%) + 2.9 × Fe (wt.%) + 1.6 × Cr (wt.%) + 1.1 × Ni (wt.%) + 1.4 × Co (wt.%) + 0.77 × Cu (wt.%)-Al (wt.%) ------ -------------- Molybdenum equivalent calculated by (1): a rod having a chemical component composition in which the value of Mo _eq (wt.%) Is in the range of 2 to 10. Manufactured by using Doo to those having features (hereinafter, a sixth of the invention) is.

Another method of manufacturing a golf club head according to the present invention is to use a rod and hot-work the face portion and the source.
Forming a head main member (T3) in which a metal part and a foresell part are integrally formed, and forming a crown member formed of a crown part by hot working using a plate or a rod; and Next, the head main member (T
3) A method of manufacturing a golf club head in which a butt portion between the crown member and the crown member is joined by welding, wherein at least a material of the head main member (T3) includes α +
It is a β-type titanium alloy and has the following formula (1): Mo _eq (wt.%) = Mo (wt.%) + 0.67 × V (wt.%) + 0.44 × W (wt.%) + 0. 28 x Nb (wt.%) + 0.22 x Ta (wt.%) + 2.9 x Fe (wt.%) + 1.6 x Cr (wt.%) + 1.1 x Ni (wt.%) + 1. 4 × Co (wt.%) + 0.77 × Cu (wt.%)-Al (wt.%) --------------------- (1) Molybdenum equivalent calculated: Mo _eq (wt.%) Characterized by being manufactured by using a rod having a chemical component composition within the range of 2 to 10 (hereinafter referred to as the seventh invention). It is).

A more desirable method of manufacturing a golf club head according to the present invention (hereinafter referred to as an eighth invention) has the following features.
The chemical composition of the head main members (T1, T2 and T3) is aluminum (Al): 3 to 5 wt.%,
Vanadium (V): 2.1 to 3.7 wt.%, Molybdenum (Mo): 0.85 to 3.15 wt.%, Iron (F
e): 0.85 to 3.15 wt.%, and
Oxygen (O): contains 0.06 to 0.2 wt.%, And the content of V, Fe and Mo is as follows (2)
Formula: 7 wt.% ≦ 0.67 × V (wt.%) + 2.9 × Fe (wt.%) + Mo (wt.%) ≦ 13 wt.% ------ (2) The balance consists of titanium and inevitable impurities,
A method according to the fifth, sixth or seventh aspect of the present invention.

A further desirable method of manufacturing a golf club head according to the present invention (hereinafter referred to as a ninth invention) is characterized in that in the method of manufacturing a golf club head according to the fifth, sixth or seventh invention, Component composition is aluminum (Al): 3-5 wt.%, Vanadium (V)
: 2.1 to 3.7 wt.%, Molybdenum (Mo):
0.85 to 3.15 wt.% Iron (Fe):
0.85 to 3.15 wt.% And oxygen (O)
: Containing 0.06 to 0.2 wt.%, And V, F
The content of e and Mo is expressed by the following formula (2): 7 wt.% ≦ 0.67 × V (wt.%) + 2.9 × Fe (wt.%) + Mo (wt.%) ≦ 13 wt.% − ----- (2) is satisfied, and the balance consists of titanium and inevitable impurities,
In addition, the head main members (T1, T
The heating temperature in the hot working of (2 or T3) is from 120 ° C. lower than the β transformation point determined according to the chemical component composition of the main head member (T1, T2 or T3), and is lower than the β transformation point. In the range up to 30 ° C. higher.

Another more desirable method of manufacturing a golf club head according to the present invention (hereinafter referred to as a tenth invention).
The method of manufacturing a golf club head according to the fifth, sixth or seventh aspect, wherein the chemical component composition is:
Aluminum (Al): 3-5 wt.%, Vanadium (V): 2.1-3.7 wt.%, Molybdenum (M
o): 0.85 to 3.15 wt.%, iron (Fe)
: 0.85 to 3.15 wt.% And oxygen (O)
: Containing 0.06 to 0.2 wt.%, And
When the content of V, Fe and Mo is the following formula (2): 7 wt.% ≦ 0.67 × V (wt.%) + 2.9 × Fe (wt.%) + Mo (wt.%) ≦ 13 wt. % ------ (2) is satisfied, and the balance consists of titanium and unavoidable impurities.
In addition, the head main members (T1, T
The heating temperature in the hot working of 2 or T3) is from 100 ° C. lower than the β transformation point determined according to the chemical component composition of the head main member (T1, T2 or T3), and is lower than the β transformation point. It is within the range of 20 ° C. lower temperature.

The components of the golf club head formed by hot working using a titanium alloy material having a limited chemical composition in the present invention are in a state of being subjected to solution treatment at the end of hot working. Is substantially obtained. Therefore, no solution treatment is performed. In addition, since a so-called natural aging effect is obtained, no aging treatment is performed unless it is desired to specifically improve mechanical properties.

[0033]

According to the present invention, the main head member including the fuser portion is formed as an integral body. In this case, since the rod is used as the material shape, there is no welding line for forming the foresell portion into a cylindrical shape, for example, a seam-like welding line as in the prior art 2. Therefore, the accuracy of the size and shape of the golf club head is improved, and the durability is also improved. As described above, a titanium alloy having the following chemical composition is used so that the main head member can be formed as an integral body. Of the components of the golf club head of the present invention, at least the main part of the head requires the use of a titanium alloy material having excellent hot workability. Use materials. The reason is as follows.

[Α + β type titanium alloy, Mo _eq (wt.%
)]: Α + β-type titanium alloy has excellent room-temperature strength. In the present invention, if the value of molybdenum equivalent: Mo _eq (wt.%) _Represented by the above formula (1) is 2 or more,
The volume fraction of β phase in the metal structure increases, and β phase-ric
Since the α + β-type titanium alloy becomes h, the β transformation point is lowered, and the hot workability is improved. However, if the value is less than 2, the effect is not sufficiently exhibited. On the other hand, if the value exceeds 10, the volume fraction of the β phase becomes too large,
β grains are coarsened and hot workability deteriorates. For example, Ti-6A, a typical alloy of the conventional α + β type titanium alloy,
In the 1-4V alloy, the β transformation point is almost 1000 ° C., whereas in the α + β titanium alloy, the β transformation point is 900 ° C.
About ℃. The titanium alloy material having the above-described chemical composition has excellent mechanical properties such as strength and toughness at room temperature, as well as being free from cracks during processing, and can be used at a lower temperature. Cold working (so-called low-temperature working) becomes possible. As a result, the main head member of the golf club head according to the present invention can be integrally formed.

On the other hand, the β-type alloy is known to be subjected to hot working, but the forging heating temperature is 1000
Since the temperature is not lower than ° C, it is inevitable to split into a number of members and perform hot forging. Therefore, oxidation also proceeds.

Next, at least the chemical composition of the main components of the head is as follows: Al: 3 to 5 wt.%, V: 2.1 to 3.7 w
t.%, Mo: 0.85 to 3.15 wt.%, Fe: 0.8
5 to 3.15 wt.%, And O: 0.06 to 0.2 w
%, and the contents of V, Fe and Mo are expressed by the following formula (2): 7 wt.% ≦ 0.67 × V (wt.%) + 2.9 × Fe (wt.%) + Mo (Wt.%) ≦ 13 wt.% ------ (2) The reason why it is desirable to satisfy the condition (2) and make the balance from titanium and unavoidable impurities is as follows.

[Al]: Titanium alloy material is usually hot forged,
It is formed by hot working by hot rolling or both. However, when the hot working temperature falls outside the proper range, the deformation resistance sharply increases, cracks occur in the material, and the manufacturability is significantly reduced. Such productivity is closely related to the Al content. That is, Al is α +
It is added as a so-called α-phase stabilizing element for obtaining β structure, and contributes to an increase in strength. However, if the Al content is less than 3 wt.%, The desired strength cannot be obtained. On the other hand, if the Al content exceeds 5 wt.%, The hot deformation resistance increases and the manufacturability deteriorates. Therefore, the Al content is 3
It is desirable to limit it within the range of -5 wt.%.

[V]: V is for obtaining α + β tissue.
It is added as a so-called β-phase stabilizing element and has an effect of increasing the strength without forming an intermetallic compound which is an embrittlement phase with Ti. That is, V mainly forms a solid solution in the β phase to strengthen it. However, the V content is 2.1 w
If the amount is less than t.%, the above-mentioned effects cannot be sufficiently exerted. On the other hand, if the V content exceeds 3.7 wt.%, The β transformation point becomes too low. Therefore, the V content is 2.1 to
It is desirable to limit it to the range of 3.7 wt.%.

[Mo]: Mo is added as a β-phase stabilizing element and contributes to a reduction in hot working temperature by lowering the β transformation point. Further, Mo has a function of increasing the strength by forming a solid solution in the β phase. However, if the Mo content is less than 0.85 wt.%, The above-described functions and effects cannot be sufficiently obtained. On the other hand, when the Mo content exceeds 3.15 wt.%, The density of the alloy material is increased, and the advantage of the titanium alloy, that is, the so-called high specific strength, is spoiled. In addition, Mo has a low diffusion rate in a titanium alloy, so that deformation stress during hot working increases. Therefore, Mo content is 0.85-3.
It is desirable to limit it within the range of 15 wt.%.

[Fe]: Like Mo, Fe is added as a β-phase stabilizing element and contributes to a reduction in hot deformation resistance by lowering the β transformation point. Further, Fe has a function of increasing the strength by forming a solid solution in the β phase. Also, Fe
Increases the volume fraction of the β-phase having good workability during hot working, so that it has an effect of reducing hot deformation resistance and suppressing generation of cracks. However, if the Fe content is less than 0.85 wt.%, The above effect is not sufficiently exhibited. On the other hand, when the Fe content exceeds 3.15 wt.%, T
An intermetallic compound, which is an embrittlement phase, is likely to be formed with i, thereby deteriorating ductility. Therefore, the Fe content is
It is desirable to limit it within the range of 0.85 to 3.15 wt.%.

[O]: O has a function of increasing the strength by forming a solid solution in the α phase. However, when the O content is 0.0
If the amount is less than 6 wt.%, The effect is not sufficiently exhibited. on the other hand,
If the O content exceeds 0.2 wt.%, The hot deformation resistance is undesirably increased. Therefore, the O content is 0.1.
It is desirable to limit it within the range of 06 to 0.2 wt.%.

[0.67 × V (wt.%) + 2.9 × Fe
(Wt.%) + Mo (wt.%)]: This value indicates the stability of the β phase of the titanium alloy. As this value decreases, the volume fraction of the β phase in the metal structure decreases, and the β transformation point decreases. On the contrary, when this value increases, the volume fraction of the β phase increases and the β transformation point decreases. And Al, V, Mo, F
When the content of e and O is within the above-mentioned range and the value indicating the stability of the β phase is less than 7 wt.%,
The volume fraction of the α-phase increases, and the deformation resistance becomes slightly too large. Therefore, the decrease in the β transformation point is slightly insufficient, and the hot workability is not sufficiently improved. On the other hand, this value is 13 w
If it exceeds t.%, the volume fraction of the β phase becomes slightly too large,
β grains are slightly coarsened and hot workability is slightly lowered. Therefore, in order to use a titanium alloy having excellent hot workability to enable the integral molding of the constituent members of the golf club head, 0.67 × V (wt.%) + 2.9 × Fe
The value of (wt.%) + Mo (wt.%) Should be limited to the range of 7-13 wt.%.

The above-mentioned member having the above-described chemical component composition becomes a so-called β-phase-rich α + β-type titanium alloy in which the volume fraction of β-phase is increased within a more appropriate range.
The β transformation point is further lowered to about 900 ° C., so that a large force is not required for hot working, and furthermore, cracks do not occur during the working, further low-temperature working becomes possible, and hot workability is improved. . As a result, the integral molding of the main head member described below becomes easy.

That is, in the present invention, since at least the head main member is made of a titanium alloy material having excellent hot workability as described above, the face portion and the foreel portion are integrally formed. Head main members (hereinafter referred to as
A head main member in which a face portion, a crown portion, and a hosel portion are integrally formed (hereinafter, referred to as a "type 2 head main member"); and a face portion. The head main member (hereinafter, referred to as a "3-type head main member") integrally formed with a sole portion and a hosel portion is formed into a complicated and highly processed shape bar material (for example, a bar member). , Round bars and square bars) by hot working. On the other hand, other members except the head main member, for example, a sole member and a crown member, do not have a complicated shape like the head main member, so that they are not necessarily formed within a range that can be formed by hot working. It is not necessary to use a material having the above-described chemical component composition, and it is desirable to use a plate material as the material shape.

Further, the golf club head of the present invention
The main head member including the fusing portion is integrally formed. Therefore, since the boundary area between the foresell portion and the face portion which are most subjected to an impact force when the golf club is used is an integrally molded product and not a joining structure such as welding, the durability is remarkably excellent. I have.

Then, a predetermined golf club head can be manufactured by joining the butted portion where the head main member and the sole member or the crown member are assembled by welding. Therefore, since the welding line is short and there are few welding points, distortion due to welding hardly occurs,
Good shape and dimensional accuracy. Further, since the welding position is only the butt portion between the sole portion, the face portion and the crown portion, it is a position where it is difficult to apply an impact force when using the golf club, and this portion is smooth. Since it has a curved shape, its durability is not impaired. Furthermore, since the welding line is short and the number of welding lines is small, the solidified structure region associated with welding is narrow. Therefore, the deterioration region of the mechanical properties such as strength and toughness is suppressed to be narrow, and the occurrence of defective size and shape of the golf club head due to welding distortion is also suppressed.

Next, the chemical composition of the main head member is as follows:
Molybdenum equivalent: Moeq (wt.%) As described above
Is in the range of 2 to 10, so that Ti-6Al-
Compared to a conventional α + β-type titanium alloy such as a 4V alloy, the β-phase-rich α + β-type titanium alloy is obtained. Therefore, a phenomenon that has not been recognized conventionally, that is, in this alloy material, at the end of hot working, a substantially solution-treated state is obtained, and the state is stabilized. After hot working, 1 ° C /
The solution treatment state can be stably obtained by air cooling for about seconds. Therefore, it is not necessary to perform the solution treatment after the hot working. Therefore, it is not necessary to perform the aging treatment for stabilizing the solutionized state of the member after welding the member. However, in order to obtain more excellent mechanical properties at room temperature, after hot working, 0.5-500 ° C. at 450-650 ° C.
It is desirable to perform aging treatment for about 10 hours. The reason for this is that if the temperature is less than 450 ° C. or the time is less than 0.5 hour, the strength increase is insufficient, and if it exceeds 600 ° C. or more than 10 hours, it softens due to overaging. It is. By performing the aging treatment, the strength of the natural aging material (about 110 to 130 kg / mm2) can be increased to 15 to 130 kg / mm2.
The strength can be improved by about 20%, and the desired strength for increasing the size of the golf club head can be easily obtained.

Further, at least the chemical composition of the main components of the head is as follows: Al: 3 to 5 wt.%, V: 2.1 to 3.7 w
t.%, Mo: 0.85 to 3.15 wt.%, Fe: 0.8
5 to 3.15 wt.%, And O: 0.06 to 0.2 w
%, with the balance consisting of titanium and unavoidable impurities, the above-described member is a so-called β phase-rich α + β type titanium alloy in which the volume% of the β phase is increased within a more appropriate range. Therefore, the β transformation point is further lowered to about 900 ° C., and the temperature at which hot working is possible is further lowered, which is advantageous in equipment and operation. Also in this case, it is not necessary to perform the solution treatment after the hot working for the same reason as described above. Further, it is not necessary to perform the aging treatment for stabilizing the solution solution state of the member after welding the member. However, in order to obtain more desirable mechanical properties at room temperature, it is desirable to perform the aging treatment after hot working.

Generally, as the heating temperature and the hot working temperature of the titanium alloy material are lowered, the oxidation and nitridation of the surface of the titanium alloy material are suppressed. In the production of the golf club head of the present invention, since a titanium alloy material having the chemical composition as described above is used, good low-temperature processing can be performed within the range of hot working.
The effect of suppressing the oxidation and nitridation is exhibited.

[0050]

The present invention will be further described below with reference to examples and comparative examples. First, the following ingots of various titanium alloys were prepared in a vacuum arc remelting furnace.

Table 1 shows the chemical composition of titanium alloys No. A1 and A2 of the present invention (hereinafter, referred to as "alloys of the present invention") having the chemical composition that at least the main head member should satisfy. The alloy No. A1 of the present invention is an α + β-type titanium alloy, and the molybdenum equivalent: Moeq of the above formula (1) is 5.4 in the range of 2 to 10, and the alloy No. of the present invention No. .A2 is 0.67 × V (wt.%) + 2.9 × Fe (w) which shows that the contents of Al, V, Mo, Fe and O are within the desired ranges and shows the stability of the β phase.
t.%) + Mo (wt.%) is 10.1 in the range of 7 to 13.

[0052]

[Table 1]

Table 2 shows typical titanium alloys suitable for golf club heads, namely, so-called 6Al of β-type titanium alloy and conventional α + β-type titanium alloy.
-4V-Ti alloy (hereinafter referred to as "conventional alloy") No.
2 shows the chemical composition of B1 and No. B2.

[0054]

[Table 2]

The ingots were hot forged and hot rolled under predetermined conditions to prepare round and square bars and plates having predetermined shapes and dimensions from each ingot. In addition,
The reduction amount of the hot rolling (expressed by the increase rate of the length of the material in the hot rolling direction) was in the range of 50 to 80%. The titanium alloy round bars and plates thus prepared were used as materials for golf club heads in Examples of the present invention and Comparative Examples.

Example A golf club head within the scope of the present invention was manufactured as follows. FIG. 1 is a schematic perspective view showing an example of an assembling state of components of a titanium alloy golf club head according to the first invention. As shown in FIG. 1, this golf club head has a sole type head main member T1 in which a face portion 1 and a hosel portion 3 are integrally formed, and a sole portion 4. The member 6 and a crown member composed of a crown portion are assembled, and butted portions are joined by welding to be integrated.

FIG. 2 is a schematic perspective view showing an example of an assembling state of components of a golf club head made of a titanium alloy according to the second invention. As shown in FIG. 1, this golf club head has a two-type head main member T in which a face portion 1, a crown portion 2, and a foresell portion 3 are integrally formed.
1 and a member 6 composed of a member 4
The butted portions are joined by welding and integrated.

FIG. 3 is a schematic perspective view showing one example of an assembling state of the constituent members of the titanium alloy golf club head according to the third invention. As shown in FIG. 1, the golf club head includes a face portion 1, a sole portion 4 and a fore portion.
A three-type head main member T2 in which the shell part 3 is formed integrally.
And a crown member 5 composed of a crown portion 2 are assembled, and butted portions are joined by welding to be integrated.

Using the titanium alloy materials shown in Tables 1 and 2, the golf club head of the present invention was manufactured under predetermined manufacturing conditions. Table 3 shows types of alloy materials used for manufacturing the golf club head of the present invention, and manufacturing conditions such as hot forging and aging conditions.

[0060]

[Table 3]

That is, at least the main head members (the main type 1 head member, the main type 2 head member, and the main type 3 head member) are made of a round bar or a square bar of the alloy of the present invention, and other members are used. , A plate material of the present invention alloy or a conventional alloy (No. B2: Ti-6Al-4V alloy) was used, and each was heated to a predetermined temperature, and then hot die forging was performed. In the die forging of the main member of the head, after the face part and the crown part, or the face part and the sole part are roughly formed, the face part and the crown part, or the face part and the crown part are formed. A finish die forging of the steel part and a drilling work of the fuel part 3 were performed.

In the die forging process, a round bar or a plate material is heated to a predetermined temperature in a heating furnace, and after forging, forging is performed using a predetermined die immediately. Accordingly, since the forging time is short, the temperature of the molded body during forging (forging temperature) is a temperature close to the heating temperature. Therefore, in the present invention, the heating temperature was used as the forging condition instead of the forging temperature.

In the hot die forging of the main head member described above, since the material has the chemical composition of the alloy of the present invention and a round bar is used, the specimens No. P1 to P.
With regard to all of Nos. 6, a monolithic member having a complicated shape was successfully molded. Next, predetermined members were assembled and joined by TIG welding to prepare an integrated golf club head. All of the golf club heads thus prepared were not subjected to the solution treatment after the forging because the solution treatment state was obtained at the end of the forging.

As described above, the aging treatment after welding does not require the aging treatment because the member using the alloy of the present invention can obtain the effect of natural aging. However, only some of them were aged to obtain better mechanical properties. Next, the surface of the golf club head was polished and painted to finish. In this way, six golf club heads having a volume of 230 cc within the scope of the present invention (hereinafter, referred to as "test samples of the present invention") were produced.

Comparative Example Next, a golf club head for comparison (hereinafter referred to as “comparative specimen”) was manufactured using the titanium alloy materials shown in Table 2.

Table 4 shows the types of alloys of the raw materials used for manufacturing the golf club head for comparison, as well as the hot forging conditions, the solution treatment conditions, and the aging treatment conditions.

[0067]

[Table 4]

With respect to the comparative specimen No. Q1, in order to manufacture a golf club head having the same form as the golf club head shown in FIG. 1, the main member of the type 1 head was a conventional alloy No. B1 (β A round bar of a conventional alloy No. B1 was used for the crown member and the sole member. The golf club head shown in FIG. 1 has a crown portion and a sole portion which are separated from each other, but may be a member in which the crown portion and the sole portion are integrally formed.

With respect to the comparative specimens No. Q2 and Q3, in order to manufacture a golf club head having the same form as the golf club head shown in FIGS. 2 and 3, respectively,
For the main head members (the main type 2 head member and the main type 3 head member), round bars of conventional alloys No. B1 (β-type alloy) and B2 (Ti-6Al-4V alloy),
The sheet member and the crown member were formed from thin sheets of conventional alloys Nos. B1 and B2, respectively, heated to a predetermined temperature, and then subjected to hot die forging.

As a result, the forging of the sole member and the crown member was successfully performed, but the head member having a complicated shape was properly forged in any of No. Q1, Q2 and Q3. Could not be performed. Therefore, the desired golf club head could not be manufactured.

For all of the comparative test pieces Nos. Q4 to Q7, golf club heads having the same configuration as the golf club head shown in FIG. 4 were manufactured as follows. That is,
The four constituent members (face portion, crown portion, fuselage portion and sole portion) were made of conventional alloy Nos. B1 and B.
Using the plate material of No. 2 and heating to a predetermined temperature, hot die forging was performed to form. After forging, it was air-cooled.

Next, the above four components were assembled, and the butted portions were joined by TIG welding to be integrated. The golf club heads thus formed were subjected to a solution treatment under the conditions shown in Table 4 for the comparative samples Nos. Q4 to Q6. However, the comparative specimen N
Regarding o. Q6, thermal distortion occurred due to water cooling quenching in the solution treatment, and subsequent tests were stopped.

Next, the comparative specimens No. Q4 and Q5
The golf club head was aged under the conditions shown in Table 4, whereas the comparative specimen No. Q7 was not aged. Then, the surface of the golf club head was polished, painted and finished. Thus, three golf club heads (comparative specimens) having a volume of 230 cc and outside the scope of the present invention were produced.

A durability test was performed on each of the six test pieces of the present invention and three test pieces for comparison. The durability test method is as follows. A golf club having a golf club shaft mounted on each specimen is prepared, and a head speed 5 is prepared.
The number of times the golf ball was hit at 0 m / sec until an abnormality occurred in any part of the golf club head,
The durability was evaluated. As a result, in the comparative specimens, all of the welds were broken or cracked in less than 6,000 actual hits. On the other hand, the test samples of the present invention exhibited durability of 6000 times or more.

[0075]

As described above, according to the present invention,
By using a β phase-rich α + β type titanium alloy having a β transformation point lower than that of a conventional α + β type titanium alloy,
That is, by using a titanium alloy having excellent properties such as exhibiting good hot workability at a relatively low temperature, obtaining a solution treatment state at the end of hot forging, and further eliminating the need for aging treatment. Since the components of a large-sized golf club head having a complicated shape can be integrally formed, the number of welding points and welding lines can be greatly reduced, and the heat treatment process can be simplified. It is possible to provide a titanium alloy golf club head having improved manufacturability, shortened manufacturing period, significantly reduced cost, and excellent durability, and a method for manufacturing the same. Is brought.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing one example of an assembly state of components of a golf club head made of a titanium alloy according to the present invention (first invention).

FIG. 2 is a schematic perspective view showing an example of an assembling state of constituent members of a titanium alloy golf club head according to the present invention (second invention).

FIG. 3 is a schematic perspective view showing an example of an assembling state of components of a golf club head made of a titanium alloy according to the present invention (third invention).

FIG. 4 is a schematic perspective view showing one example of an assembly drawing of a conventional titanium alloy golf club head.

FIG. 5 is an assembly view 1 of a conventional metal golf club head.
It is an outline perspective view showing an example.

[Explanation of symbols]

T1 Type 1 head main member T2 Type 2 head main member T3 Type 3 head main member 1 Face portion 2 Crown portion 2a Part of the crown portion and portion adjacent to the face portion 2b Another part of the crown portion 3 A portion which is not adjacent to the face portion 3 A fuel portion 4 A sole portion 4 a A portion of the sole portion which is adjacent to the face portion 4 b The other portion of the sole portion 5 Crown member 6 Source member 7 Face side member 8 Back side member 9a Abutting portion 9a of the foreel portion with the crown portion and the face portion 9b -Butt of crown and crown

──────────────────────────────────────────────────続 き Continuing on the front page (72) Kunisuke Minagawa, 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nippon Kokan Co., Ltd. (72) Inventor Makoto Yamada 1-1-2, Marunouchi, Chiyoda-ku, Tokyo Nippon Kokan Inside (72) Inventor Atsushi Ogawa 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Inside Nippon Kokan Co., Ltd. (72) Inventor Hiroshi Hashimoto 1-2-4, Higashi-Ueno, Taito-ku, Tokyo Inside G3 ( 72) Inventor Wei 隆 ▼ 誼 誼 チ ャ 台湾 イ ス 台湾 チ ャ 台湾 台湾 台湾 台湾 56 台湾 56 56 72 72) 72 72 72) 72 72))) 72. 4-367678 (JP, A) Japanese Utility Model Showa 58-73270 (JP, U) JP-B 61-33973 (JP, B2) (58) Fields investigated (Int. Cl. ⁷ , DB name) A63B 53/04 C22C 14/00 C22F 1 / 18

Claims (10)

(57) [Claims] 1. A head main member (T1) in which a face portion and a fuselage portion are integrally formed, and a crown portion and a sole portion formed independently of the head main member (T1). And one or two members other than the part where the face part and the foresell part are adjacent to each other are joined by welding, and further, At least the head main member (T1) is an α + β type titanium alloy, and has the following formula (1): _Moeq (wt.%) = Mo (wt.%) + 0.67 × V (wt.%) + 0. 44 × W (wt.%) + 0.28 × Nb (wt.%) + 0.22 × Ta (wt.%) + 2.9 × Fe (wt.%) + 1.6 × Cr (wt.%) + 1. 1 × Ni (wt.%) + 1.4 × Co (wt.%) + 0.77 × Cu (wt.%)-Al (wt.%) --------------- --- (1 In molybdenum equivalent is calculated: Mo _eq value of (. Wt%) is characterized by having a chemical composition within the range of 2-10, titanium alloy golf club head. 2. A head main member (T2) in which a face portion, a crown portion, and a foresell portion are integrally formed, and a sole member formed by a sole portion,
An assembly butted portion of the main head member (T2) and the sole member is joined by welding, and the crown portion is continuous from at least an upper portion of the face portion toward a rear portion thereof. The formed golf club head, wherein at least the head main member (T1) is an α + β type titanium alloy, and the following formula (1): Mo _eq (wt.%) = Mo (wt.%) + 0 .67 × V (wt.%) + 0.44 × W (wt.%) + 0.28 × Nb (wt.%) + 0.22 × Ta (wt.%) + 2.9 × Fe (wt.%) + 1 0.6 × Cr (wt.%) + 1.1 × Ni (wt.%) + 1.4 × Co (wt.%) + 0.77 × Cu (wt.%)-Al (wt.%) ---- --------------- (1) molybdenum equivalent is calculated by: the value of Mo _eq (. wt%) is that it has a chemical composition within the range from 2 to 10 And wherein, titanium alloy golf club head. 3. A head main member (T3) in which a face portion, a sole portion and a foreel portion are integrally formed, and a crown member formed by a crown portion, wherein the head is provided. The assembled butted portion of the main member (T3) and the crown member is joined by welding, and the sole portion is formed continuously from at least a lower portion of the face portion toward the rear thereof. At least the head main member (T3) is an α + β type titanium alloy, and the following formula (1): Mo _eq (wt.%) = Mo (wt.%) + 0.67 × V (wt.%) + 0.44 × W (wt.%) + 0.28 × Nb (wt.%) + 0.22 × Ta (wt.%) + 2.9 × Fe (wt.%) + 1.6 × Cr (wt.%) + 1.1 × Ni (wt.%) + 1.4 × Co (wt.%) + 0 77 × Cu (. Wt%) -Al (. Wt%) -------------------- (1) molybdenum equivalent is calculated by: Mo _eq (wt. %) Having a chemical composition within the range of 2 to 10. 4. The chemical composition of the head main members (T1, T2 and T3) is as follows: aluminum (Al): 3 to 5 wt.%, Vanadium (V): 2.1 to 3.7 wt.%. , Molybdenum (Mo): 0.85 to 3.15 wt.%, Iron (Fe): 0.85 to 3.15 wt.%, And oxygen (O): 0.06 to 0.2 wt.% And the contents of V, Fe and Mo are as follows (2)
Formula: 7 wt.% ≦ 0.67 × V (wt.%) + 2.9 × Fe (wt.%) + Mo (wt.%) ≦ 13 wt.% ------ (2) The balance consists of titanium and inevitable impurities,
The golf club head made of a titanium alloy according to claim 1. 5. A head main member (T1) in which a face portion and a foresell portion are integrally formed by hot working using a bar, and using a plate or a bar, Forming one or two other members including a crown portion and a sole portion formed independently of the main member (T1) by machining, and then forming the head main member (T1) and the A method for manufacturing a golf club head in which an assembly butted portion with another member is joined by welding, wherein at least a material of the head main member (T1) is an α + β type titanium alloy, and the following formula (1): Mo _eq (wt.%) = Mo (wt.%) + 0.67 × V (wt.%) + 0.44 × W (wt.%) + 0.28 × Nb (wt.%) + 0.22 × Ta ( wt.%) + 2.9 × Fe (wt.%) + 1.6 × Cr (wt.%) + 1. × Ni (wt.%) + 1.4 × Co (wt.%) + 0.77 × Cu (wt.%)-Al (wt.%) ---------------- ---- Molybdenum equivalent calculated by (1): Mo _eq (wt.%) Is characterized by being manufactured by using a rod having a chemical composition within the range of 2 to 10. To manufacture a titanium alloy golf club head. 6. A face part, which is formed by hot working using a bar.
A main head member (T2) in which a crown portion and a foresell portion are integrally formed is formed, and a plate member or a bar member is used to form a soled member formed of a sole portion by hot working. And then the head main member (T
2) A method of manufacturing a golf club head in which an assembled butted portion of the sole member and the sole member is joined by welding, wherein at least a material of the main head member (T2) is an α + β type titanium alloy; Equation (1): Mo _eq (wt.%) = Mo (wt.%) + 0.67 × V (wt.%) + 0.44 × W (wt.%) + 0.28 × Nb (wt.%) + 0 .22 x Ta (wt.%) + 2.9 x Fe (wt.%) + 1.6 x Cr (wt.%) + 1.1 x Ni (wt.%) + 1.4 x Co (wt.%) + 0 .77 × Cu (wt.%)-Al (wt.%) --- Molybdenum equivalent calculated by (1): Mo _eq (wt %) In a range from 2 to 10 using a rod having a chemical composition within the range of 2 to 10. 7. A face part, which is formed by hot working using a bar.
Seo - le unit and follower - diesel portion is molded head main member formed integrally (T3), and, was sheet or using the bar, forming a crown member formed by the crown portion by hot working Then, a method for manufacturing a golf club head in which an assembly butted portion of the head main member (T3) and the crown member is joined by welding, wherein at least a material of the head main member (T3) includes: α + β type titanium alloy, wherein the following formula (1) is used: Mo _eq (wt.%) = Mo (wt.%) + 0.67 × V (wt.%) + 0.44 × W (wt.%) + 0. 28 x Nb (wt.%) + 0.22 x Ta (wt.%) + 2.9 x Fe (wt.%) + 1.6 x Cr (wt.%) + 1.1 x Ni (wt.%) + 1. 4 × Co (wt.%) + 0.77 × Cu (wt.%)-Al (wt.%) --- Calculated by (1) Of a titanium alloy golf club head, characterized in that it is manufactured by using a rod having a chemical component composition having a molybdenum equivalent: Mo _eq (wt.%) In the range of 2 to 10. Production method. 8. The chemical composition of the head main members (T1, T2 and T3) is as follows: aluminum (Al): 3 to 5 wt.%, Vanadium (V): 2.1 to 3.7 wt.%. , Molybdenum (Mo): 0.85 to 3.15 wt.%, Iron (Fe): 0.85 to 3.15 wt.%, And oxygen (O): 0.06 to 0.2 wt.% And the contents of V, Fe and Mo are as follows (2)
Formula: 7 wt.% ≦ 0.67 × V (wt.%) + 2.9 × Fe (wt.%) + Mo (wt.%) ≦ 13 wt.% ------ (2) The balance consists of titanium and inevitable impurities,
A method for manufacturing a golf club head made of a titanium alloy according to claim 5. 9. The method of manufacturing a golf club head according to claim 5, wherein the chemical component composition is: aluminum (Al): 3 to 5 wt.%, Vanadium (V): 2 0.1 to 3.7 wt.%, Molybdenum (Mo): 0.85 to 3.15 wt.%, Iron (Fe): 0.85 to 3.15 wt.%, And oxygen (O): 0 0.06 to 0.2 wt.%, And the contents of V, Fe and Mo are as follows (2)
Formula: 7 wt.% ≦ 0.67 × V (wt.%) + 2.9 × Fe (wt.%) + Mo (wt.%) ≦ 13 wt.% ------ (2) The balance consists of titanium and inevitable impurities,
In addition, the head main members (T1, T
The heating temperature in the hot working of (2 or T3) is from 120 ° C. lower than the β transformation point determined according to the chemical component composition of the main head member (T1, T2 or T3), and is lower than the β transformation point. A method for producing a titanium alloy golf club head, wherein the temperature is up to a temperature higher by 30 ° C. 10. The method of manufacturing a golf club head according to claim 5, wherein the chemical component composition is: aluminum (Al): 3 to 5 wt.%, Vanadium (V): 2 0.1 to 3.7 wt.%, Molybdenum (Mo): 0.85 to 3.15 wt.%, Iron (Fe): 0.85 to 3.15 wt.%, And oxygen (O): 0 0.06 to 0.2 wt.%, And the contents of V, Fe and Mo are as follows (2)
Formula: 7 wt.% ≦ 0.67 × V (wt.%) + 2.9 × Fe (wt.%) + Mo (wt.%) ≦ 13 wt.% ------ (2) The balance consists of titanium and inevitable impurities,
In addition, the head main members (T1, T
The heating temperature in the hot working of 2 or T3) is from 100 ° C. lower than the β transformation point determined according to the chemical component composition of the head main member (T1, T2 or T3), and is lower than the β transformation point. A method of manufacturing a golf club head made of a titanium alloy, wherein the temperature is within a range of 20 ° C. lower.