JP2000254260A - Metal golf club head and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a metal golf club head for reducing a high shooting sound inherent to a metal generated in shooting a ball and producing proper mass distribution corresponding to the peculiarity of a golfer and provide a method of easily and shortly manufacturing the metal golf club head. SOLUTION: When a metal plate 4 having a thickness of 0.1 mm-1.0 mm is bonded to a sole shell 2a with spot welding, the metal plate 4 is subjected to spot welding and fixation in an area inside the peripheral edge 5 at equal spaces to form nuggets 8 between the metal plate 4 and the sole shell 2a and the metal plate 4 is floated during the formation of the nuggets 8 to form a 0.02-0.20 mm gap 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a metal golf club head and a method for manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, there are many metal golf club heads having a hollow portion. When such a metal golf club head having a hollow portion hits a ball, a high hitting sound peculiar to metal may resonate or give a player an uncomfortable feeling. So, in the hollow part,
2. Description of the Related Art A metal golf club head is known which is filled with a filler such as foamable polyurethane to suppress a high hitting sound peculiar to metal generated when hitting a ball.

[0003] In addition, as means for suppressing the hitting sound peculiar to metal, for example, Japanese Utility Model Registration No. 25
No. 26923 is a metal golf club head having a hollow chamber portion, in which a sheet member or a paint having a vibration damping property is coated on an inner surface of a thin wall portion of the surrounding wall forming the hollow chamber portion, A golf club head characterized by being partially adhered is disclosed.

On the other hand, golf club heads are, for example,
For golfers who "do not go up", add a mass to the inner surface of the sole to lower the center of gravity in order to make it easier to hit the ball, and for golfers who "ball up" In order to suppress this, it is important to set an appropriate mass distribution according to the golfer's habit, such as setting the center of gravity higher by adding mass to the inner surface of the crown portion. Conventionally, in order to set the mass distribution as described above, in the head body, a metal piece made of the same material as the head body is arranged at a desired position, and the entire periphery of the metal piece is placed on the inner surface of the head body. Golf club heads formed by TIG welding are known.

[0005] Further, in a golf club head made of pure titanium or a titanium alloy having a small specific gravity and excellent strength, the head volume has been increased, so that a metal having a large specific gravity and different from the main body is used as a mass adjuster. By using as a large mass can be obtained in a small volume,
It is known that more effective mass distribution can be set, but pure titanium or a titanium alloy and a dissimilar metal having a large specific gravity are poor in weldability by conventional TIG welding, and sufficient joining strength is obtained. It is also known that it cannot be done. As a method of fixing a mass adjuster made of a dissimilar metal to a golf club head made of pure titanium or a titanium alloy, for example,
A method of fixing with mechanical fastening means such as a screwing method as disclosed in JP-A-6-335540 and a press-fitting method as disclosed in JP-A-10-94623 is common. It is.

[0006]

SUMMARY OF THE INVENTION However, a metal golf golfer capable of simultaneously suppressing the high hitting sound peculiar to metal generated at the time of hitting a ball and setting an appropriate mass distribution according to the golfer's habit. A club head and a method of easily manufacturing the metal golf club head have not been found in the past.

For example, in order to suppress the high hitting sound peculiar to metal generated at the time of hitting the ball, a metal golf club head in which a filler such as foamable polyurethane is filled in a hollow portion has a filling material which covers the entire hollow portion. Because it is filled,
The mass distribution of the head moves from the peripheral side to the center side, and therefore, there is a problem that the moment of inertia is reduced and the golf club head has a narrow sweet area.

[0008] Similarly, the utility model registration publication No. 2526
The sheet body having the vibration damping property disclosed in No. 923 is formed by laminating a metal foil on a thermosetting resin or rubber.
There is a problem that the mass is small and the effect of setting the mass distribution cannot be obtained. Furthermore, in the method for manufacturing a head to which the sheet member is attached, as a method for fixing the sheet member to the inner surface of the surrounding wall, sticking or bonding using an adhesive or an adhesive is used. The adhesive and the adhesive have the disadvantage that they are deteriorated when high heat is applied, and that sufficient bonding strength cannot be maintained. Therefore, after attaching or bonding the sheet body to the inner surface of the surrounding wall, members forming the surrounding wall are joined by TIG welding, or the surface of the surrounding wall, that is, the surface of the golf club head is The manufacturing method of polishing or the like has a problem that it cannot be used because high heat is generated.

Similarly, when a paint having a vibration damping property is adhered to the inner surface of a thin wall portion of the surrounding wall forming the hollow chamber, the mass of the paint is small, so that the effect of the mass distribution setting can be obtained. In addition, the production method involving welding or polishing has a problem that the coating material deteriorates due to high heat and cannot be used.

On the other hand, in order to set an appropriate mass distribution,
In the head body, a metal piece made of the same material as the head body is arranged at a desired position, and the entire periphery of the metal piece is
An IG-welded metal golf club head does not have a function of absorbing sound such as vibration damping characteristics of the metal piece itself, and the entire metal piece has a TI body and a TI.
There is a problem that sound cannot be absorbed even from the structure because it is G-welded and integrated. Also,
Also in the manufacturing method, conventionally, since the metal piece has a prismatic shape, one surface of the metal piece having a prismatic shape is processed in advance into a curved surface substantially the same as the inner surface shape of the head body,
The entire periphery of the metal piece must be TIG-welded after being brought into contact with the inner surface of the head body without any gap, and a high-precision processing technique is required, and it is difficult to perform processing in a short time. there were.

A golf club head made of pure titanium or a titanium alloy having a small specific gravity, disclosed in JP-A-6-335540 and JP-A-10-94623, is provided with a mass adjuster made of a metal having a large specific gravity by using a screw. As described above, the golf club head fixed by mechanical fastening means such as stop and press-fitting does not have a function of absorbing sound in the mass adjuster itself made of metal having a large specific gravity, and has a screw-fastening and press-fitting. In order to firmly fix the mass adjustment body to the inner surface of the head body by mechanical fastening means such as
Since the surface of the mass adjuster to be joined is in contact with the inner surface of the head main body without any gap, there is a problem that sound cannot be absorbed even from a structural point of view.
Also, in the manufacturing method, in the case of screwing, the mass adjusting body is threaded, and in the case of press-fitting, a press-fit fitting portion with high fitting accuracy with the mass adjusting body is machined on the inner surface of the head. However, there is a problem that it is troublesome, processing is difficult in a short time, and processing cost is increased.

In view of the drawbacks of such a conventional metal golf club head and a method of manufacturing the same, it is possible to suppress a high hitting sound peculiar to metal generated at the time of hitting a ball, and to set an appropriate mass according to the golfer's habit. An object of the present invention is to provide a metal golf club head in which the distribution setting is performed at the same time, and a method for easily manufacturing the metal golf club head in a short time.

[0013]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above object.
When joining a metal plate having a thickness of 0.1 mm to 1.0 mm to the inner surface of an outer shell constituting a metal golf club head having a hollow portion by spot welding, a portion inside a peripheral portion of the metal plate is spotted. A metal golf club head characterized by being welded.

According to a second aspect of the present invention, the metal golf club head is made of pure titanium or a titanium alloy, and
The metal golf club head according to claim 1, wherein the metal plate is made of a tungsten alloy having a specific gravity of 17 to 19.

According to a third aspect of the present invention, a plurality of shell members constituting a metal golf club head having a hollow portion are provided.
0.1 mm thick on the inner surface of at least one outer shell member
When joining a metal plate of about 1.0 mm by spot welding, after spot welding at a portion inside the peripheral portion of the metal plate, the respective outer shell members are joined and integrated with each other, and the outer shell is formed by spot welding. A method of manufacturing a metal golf club head, characterized in that the surface of the outer shell member is polished until the depression generated on the member surface is eliminated.

According to a fourth aspect of the present invention, in the metal golf club head, the area per spot welding is 0.2 to 1.0% of the area of the metal plate, and the total area of the spot welding is: 4. The method according to claim 3, wherein the area of the metal plate is 3 to 12%.

According to a fifth aspect of the present invention, the metal golf club head is made of pure titanium or a titanium alloy, and
5. The method according to claim 3, wherein the metal plate is made of a tungsten alloy having a specific gravity of 17 to 19.

[0018]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a perspective view showing a metal golf club head 1 according to an embodiment of the present invention, and FIG.
FIG. 3 is a cross-sectional view taken along line AA of FIG. 1 and FIG. Metal golf club head 1 shown in FIG.
Is a metal golf club head having a hollow portion,
As shown in FIG. 2, a metal plate 4 having a predetermined shape is spot-welded to an inner surface 3 of a sole outer shell 2a of an outer shell 2 constituting the metal golf club head 1 along a sole surface ridge line 13a. At the time of the spot welding on the surface of the metal plate 4 at the same time, at the portion inside the peripheral edge 5 of the metal plate 4, spot welding is performed at substantially equal intervals. Then, a depression 6 which is a trace of spot welding is formed. As shown in FIG. 3, the metal plate 4 and the sole outer shell 2a are fused and integrated by spot welding between the metal plate 4 and the inner surface 3 of the sole outer shell 2a. A nugget 8 is formed, and the metal plate 4 rises when the nugget 8 is formed.
Is formed.

Accordingly, the metal golf club head 1 of the present invention sets the position of the center of gravity low by spot welding the metal plate 4 to the inner surface 3 of the sole outer shell 2a, thereby making it easy to hit the ball and hitting the ball. Then, the reverberation sound generated in the hollow portion 7 enters the gap 9 between the metal plate 4 and the sole shell 2a, and the metal plate 4, the sole shell 2a, and the nugget 8 During the collision and repeated irregular reflection, a part of the reverberation sound is transmitted from the nugget 8 to the surface of the sole shell 2a and is pronounced as a metal sound, but most of the reverberation sound is converted into heat energy. It is converted and muted.

The metal plate 4 has a thickness of 0.1 mm to
By setting the thickness to 1.0 mm, preferably 0.2 to 0.5 mm, the sole portion outer shell has a mass capable of setting a mass distribution, and is provided with flexibility and can be easily formed. It becomes easy to follow the inner surface 3 of 2a. 0.1mm thick
In the following, the mass is reduced, and the effect of setting the mass distribution is not obtained. When the thickness is 1.0 mm or more, the plate becomes a rigid plate that is difficult to bend, and the sole outer shell 2a
Is difficult to follow along the inner surface 3.

In the metal golf club head 1 of the present invention, when the metal plate 4 is joined by spot welding, the metal plate 4 is spot-welded at a portion inside the peripheral portion 5 of the metal plate, so that the reverberation noise is reduced. Therefore, it is possible to easily enter the gap 9 between the metal plate 4 and the sole outer shell 2a.

The area per spot welding is set to 0.2 to 1.0% of the area of the metal plate 4, and the surface of the metal plate 4 is spot-welded at substantially equal intervals. By setting the total area of the spot welding to 3 to 12% of the area of the metal plate 4, the metal plate 4 and the sole outer shell 2a are firmly joined and formed by spot welding. This is desirable because the number of the nuggets 8 increases, and the number of times that reverberation sounds collide with the nuggets 8 and diffusely reflect increases.

Also, by spot welding, when the nugget 8 is formed, the interval between the gaps 9 generated by floating the metal plate 4 is 0.02 to 0.20 mm, preferably 0.05 to 0.10 mm. By doing so, the distance between the metal plate 4 and the sole shell 2a can be reduced, so that the number of collisions and irregular reflections of the reverberation can be increased, which is desirable.

As a material of the metal golf club head 1 of the present invention, pure titanium, a titanium alloy, stainless steel, soft iron, or the like can be used. As a material of the metal plate 4, pure titanium, a titanium alloy, It can be selected from stainless steel, soft iron, tungsten alloy, tantalum alloy or the like according to the condition of the mass distribution setting with the material of the metal golf club head 1 and the quality of the spot weldability. The material is pure titanium or a titanium alloy, and the material of the metal plate 4 has a specific gravity of 17 to 1
It is preferable to use a tungsten alloy of No. 9 because more effective mass distribution can be set. If the specific gravity of the tungsten alloy is 17 or less, the effect of setting the mass distribution is reduced. If the specific gravity of the tungsten alloy is 19 or more, the tungsten alloy has a large amount of tungsten. Poor weldability.

Further, the material of the metal golf club head 1 is made of pure titanium or a titanium alloy, and the material of the metal plate 4 is made of a tungsten alloy having a specific gravity of 17 to 19, the thickness of which is 0.1 to 0. 0.5 mm and an elongation of 10% or more, for example, Fe: 1.0 to 3.0% by mass ratio, N
i: 3.0 to 5.0%, W: balance of tungsten and unavoidable impurities, and more effective mass distribution can be set by using a 0.1 to 0.5 mm thick tungsten alloy. It is preferable because it has a large mass, is flexible, can be easily fitted, can be cut using simple tools such as scissors, and can be finely adjusted in mass. The thickness is 0.
If the thickness is 1 mm or less, the mass becomes small, and the effect of setting the mass distribution cannot be obtained. If the thickness is 0.5 mm or more, cutting using a simple tool such as scissors cannot be performed, which is not preferable. On the other hand, if the elongation is less than 10%, it is difficult to conform to the inner surface shape having a small curvature, which is not preferable.

Next, a method of manufacturing the metal golf club head 1 of the present invention will be described. As shown in FIG. 4, the metal golf club head 1 of the present invention has a sole outer shell 2 in which a sole surface 13 and a peripheral portion of the head are integrally formed.
After a metal plate 4 having a predetermined shape is uniformly spot-welded to the inner surface 3 along the sole surface ridge line 13a at substantially equal intervals at a portion inside the peripheral portion 5 of the metal plate 4, the metal plate 4 A shell 2a and a face outer shell 2b in which a neck 10 and a face 11 for connecting the shaft are integrally formed.
And the crown surface 12 and the crown outer shell 2c, the periphery of which is integrally formed, are assembled by TIG welding with each other. As shown in FIG. A depression 22 having a depth of 0.1 to 0.3 mm is formed on the surface of the sole surface 13 of the shell 2a.
a by uniformly polishing the surface of
Finishing is performed by polishing the surface of the metal golf club head 1 until the weld bead 23 generated by the IG welding is eliminated.

The metal plate 4 has a thickness of 0.1 to 1.0 mm, preferably 0.2 to 1.0 mm, as shown in FIGS. A powdery metal is filled in a 0.5 mm cavity 17 and heated or pressed by a powder sintering method, or a desired metal plate 4 having a larger area and a thickness of 0.1 to 1.0 mm, preferably 0 to 1.0 mm. A flat metal plate intermediate body 19 is produced by punching a metal flat plate 18 having a thickness of 2 to 0.5 mm, and the metal plate intermediate body 19 is attached to the inner surface 3 of the sole outer shell 2a.
It is manufactured by bending into a curved surface shape of a portion where the metal plate 4 is disposed.

The metal plate 4 has a thickness of 0.1 mm or more.
When the thickness of the metal plate 4 is set to 1.0 mm, preferably 0.2 to 0.5 mm, the metal plate 4 has a mass capable of setting a mass distribution, is flexible, and can be easily formed.
However, even if the metal plate 4 on the inner surface 3 of the sole portion outer shell 2a is slightly displaced from the portion where the metal plate 4 is to be disposed, or the curvature of the portion where the metal plate 4 on the inner surface 3 of the sole portion outer shell 2a is to be disposed Even if the surface shape is slightly out of order due to mass production errors, it can be easily followed by finger pressure or the like. Therefore, high-precision processing technology is not required, and short-time processing can be performed. When the thickness is 0.1 mm or less, the mass is small, and the effect of setting the mass distribution is not obtained. When the thickness is 1.0 mm or more, the rigid plate is hard to bend, and the sole portion outer shell 2 a It becomes difficult to follow the inner surface 3.

As shown in FIGS. 7 and 8, the spot welding between the metal plate 4 and the outer shell 2a is performed by overlapping and fixing the metal plate 4 and the outer shell 2a. A desired portion is pressurized by the pair of electrodes 20 and 21, a welding current is applied after the applied pressure is stabilized, and resistance heat is generated.
Then, the metal plate 4 and the sole outer shell 2a are melted and integrated to form the nugget 8, and the metal plate 4 is lifted up when the nugget 8 is formed. A gap 9 is formed. Thereafter, the pressure applied to the electrodes 20 and 21 is released to complete one spot welding. The metal plate 4 after spot welding
And a depression 6 having a depth of 0.1 to 0.3 mm at a location where the electrodes 20 and 21 are pressed into the sole outer shell 2a.
22 are formed.

The above-described operation is repeated, and spot welding is carried out uniformly at substantially equal intervals on a portion inside the peripheral portion of the surface of the metal plate 4 so that the mass of the metal plate 4 is reduced to the outer shell 2a of the sole portion. A structure having a large number of nuggets 8 and gaps 9 between the metal plate 4 and the sole outer shell 2a, in addition to setting the center of gravity lower by adding to the inner surface 3, that is,
The reverberation generated when the ball is hit is
The metal plate 4 and the sole shell 2a and the nugget 8 enter the gap 9 between the metal plate 4 and the sole shell 2a.
A structure having a function of absorbing sound can be obtained, in which most of the reverberation can be converted into heat energy and silenced during repeated irregular reflections caused by collision.

By performing spot welding on a portion inside the peripheral edge portion 5 of the metal plate 4, a gap 9 between the metal plate 4 and the sole shell 2a of the reverberation sound can be obtained.
Can be easily entered.

Further, the area per spot welding is set to 0.2 to 1.0% of the area of the metal plate 4, and the surfaces of the metal plate 4 are spot-welded at substantially equal intervals. By setting the total area of the spot welding to 3 to 12% of the area of the metal plate 4, the metal plate 4 and the sole outer shell 2a are firmly joined together and formed by spot welding. It is desirable because the number of the nuggets 8 increases and the number of times that the reverberation sound collides with the nuggets 8 and diffuses increases. If the area per spot welding is 0.2% or less of the area of the metal plate 4, sufficient joining strength cannot be maintained, and if it is 1.0% or more, the area formed by spot welding is not sufficient. As the nugget 8 increases, the number of the nuggets 8 decreases,
The number of times that the reverberation sound collides with the nugget 8 and is irregularly reflected is reduced. If the total area of the spot welds is 3% or less of the area of the metal plate 4, a sufficient joining strength cannot be maintained, and the number of the nuggets 8 decreases, so that the number of times of the reverberation sound colliding and diffusely reflected decreases. On the other hand, if it is 12% or more, the number of times of spot welding increases, so that it takes a long time for the operation.

The gap between the gaps 9 and the depths of the depressions 6 and 22 can be adjusted to some extent by adjusting the pressing force, the magnitude of the welding current, and the energizing time during spot welding. The interval of the gap 9 is 0.02 to 0.20 m
m, preferably 0.05 to 0.10 mm, the distance between the metal plate 4 and the sole shell 2a can be narrowed, so that the number of collisions and irregular reflections of the reverberation can be increased. desirable. When the gap 9 is 0.
If it is less than 02 mm, it will be too narrow and the amount of penetration of the reverberation sound will be small.

In the recesses 6 and 22, the metal plate 4
The depth of the depression 6 formed on the surface of the metal plate 4
Although there is no particular limitation as long as it is within the range of the thickness of the above, the depth of the depression 22 formed on the surface of the sole outer shell 2a is:
The thickness of 0.1 to 0.3 mm is preferable because it serves as a mark when the surface of the sole shell 2a is uniformly polished. When the depth of the depression 22 is 0.1 mm or less, the surface of the sole outer shell 2a is uniformly formed until the depression 22 disappears because the scratches and irregularities existing on the surface of the sole outer shell 2a are deeper. Even if it is polished, the scratches and the irregularities remain. When the depth of the recess 22 is 0.3 mm or more, if the surface of the outer shell 2a is uniformly polished using the recess 22 as a mark, the amount of polishing becomes excessively large and the weight of the metal golf club is light. It becomes head 1.

In the spot welding, as described above,
Since the joining metals are joined by heating while applying pressure, diffusion of metal atoms occurs between joining surfaces, so that joining can be performed even if the joining metals are different metals. Therefore, as a material of the metal golf club head 1 of the present invention, pure titanium, a titanium alloy, stainless steel, soft iron, or the like can be used. As a material of the metal plate 4, pure titanium, a titanium alloy, stainless steel, or the like can be used. , Soft iron, tungsten alloy, tantalum alloy, etc., can be selected according to the condition of setting the mass distribution with the material of the metal golf club head 1 and the quality of the spot weldability. Is made of pure titanium or a titanium alloy, and the material of the metal plate 4 has a specific gravity of 17 to 1
9 makes it possible to set the mass distribution more effectively, and in addition to the conventional mechanical fastening means such as screwing or press-fitting, it can be processed in less time and at a low cost in a short time. it can. In the case of the head having the above-described configuration, if the specific gravity of the tungsten alloy is 17 or less, the effect of the mass distribution setting is reduced, and if the specific gravity of the tungsten alloy is 19 or more, the tungsten component is increased and pure titanium or titanium alloy is used. The spot weldability is deteriorated.

Further, the material of the metal golf club head 1 is made of pure titanium or a titanium alloy, and the material of the metal plate 4 is made of a tungsten alloy having a specific gravity of 17 to 19 having a thickness of 0.1 to 0. 0.5 mm and an elongation of 10% or more, for example, Fe: 1.0 to 3.0% by mass / mass ratio,
Ni: 3.0 to 5.0%, W: balance of tungsten and unavoidable impurities, and more effective mass distribution can be set by using a tungsten alloy having a thickness of 0.1 to 0.5 mm. It is preferable because it has a large mass, is flexible, can be easily fitted, can be cut using simple tools such as scissors, and can be finely adjusted in mass. The thickness is 0.
If the thickness is 1 mm or less, the mass becomes small, and the effect of setting the mass distribution cannot be obtained. If the thickness is 0.5 mm or more, cutting using a simple tool such as scissors cannot be performed, which is not preferable. On the other hand, if the elongation is less than 10%, it is difficult to conform to the inner surface shape having a small curvature, which is not preferable.

In the present embodiment, the outer shell 2 constituting the metal golf club head 1 having a hollow portion,
The metal golf club head 1 has a metal plate 4 of a predetermined shape spot-welded to the inner surface 3 of the sole outer shell 2a along the ridgeline 13a of the sole to set the position of the center of gravity to be low, so that the ball can be easily hit. The metal plate 4 has a thickness of 0.1.
If it is 1.0 mm to 1.0 mm, the shape and the number of sheets to be used can be freely designed in consideration of the mass of the entire metal golf club head 1 and the efficiency of spot welding work. The position of the metal plate 4 may not necessarily be the inner surface 3 of the sole outer shell 2a. For example, although not shown, the metal plate 4 is disposed on the inner surface of the crown outer shell 2c to form a spot. If welding is performed, the position of the center of gravity can be set high, and it can be suppressed that the hit ball blows up.

The components of the outer shell 2 of the metal golf club head 1 are not necessarily the sole outer shell 2a, the face outer shell 2b, and the crown outer shell 2c as shown in FIG. It is not limited to three outer shell members. For example, although not shown, the face outer shell 2
b and an outer shell member in which the sole outer shell 2a and the crown outer shell 2c are integrally formed, or a neck portion for connecting a shaft and a face surface. It may be composed of two members, an outer shell member in which the crown surface and its peripheral portion are integrally formed, and an outer shell member having a sole surface.

[0039]

As described above, the metal golf club head according to the present invention has a thickness of 0.1 m on the inner surface of the outer shell constituting the metal golf club head having the hollow portion.
When a metal plate of m to 1.0 mm is joined by spot welding, the metal golf club head is characterized in that spot welding is performed on a portion inside the peripheral portion of the metal plate. It is possible to suppress a peculiar high hitting sound, and at the same time, to set an appropriate mass distribution according to a golfer's habit.

In addition, the metal golf club head is
Since the metal plate is made of a tungsten alloy having a specific gravity of 17 to 19, the metal plate is made of pure titanium or a titanium alloy having the same material as the metal golf club head. Since a large mass can be obtained with a small volume as compared with the case of, the more effective mass distribution setting is possible.

In the method for manufacturing a metal golf club head according to the present invention, the thickness of the inner surface of at least one of the plurality of outer shell members constituting the metal golf club head having a hollow portion may be increased. Is 0.1mm to 1.0m
When joining the metal plate of m by spot welding, after spot welding at a portion inside the peripheral portion of the metal plate,
A metal golf club head, wherein each outer shell member is joined and integrated with each other, and the surface of the outer shell member is polished until spots formed on the outer shell member surface are eliminated by spot welding. Therefore, a metal golf club head capable of suppressing a high hitting sound peculiar to metal generated at the time of hitting a ball and simultaneously performing an appropriate mass distribution setting according to a golfer's habit. , Can be easily manufactured in a short time.

Incidentally, a series of spot welding operations can be completed in one to two seconds for spot welding in one place and 15 to 30 seconds in all places, and can be processed in a short time. Since the metal golf club head does not deteriorate, the outer shell members constituting the metal golf club head are joined by TIG welding, or the surface of the sole outer shell and the surface of the metal golf club head are polished. Or you can.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a metal golf club head according to an embodiment.

FIG. 2 is a sectional view taken along line AA of FIG. 1;

FIG. 3 is an enlarged explanatory view of a main part of FIG. 2;

FIG. 4 is a perspective view showing a state before assembling the metal golf club head of the embodiment.

FIG. 5 is a bottom view showing the metal golf club head according to the embodiment after being assembled.

FIG. 6 is an explanatory view showing a manufacturing process of the metal plate of the present embodiment.

FIG. 7 is an explanatory view showing a manufacturing process of spot welding according to the embodiment.

FIG. 8 is an explanatory diagram showing a manufacturing process of spot welding according to the present embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Metal golf club head 2 Outer shell 2a Sole outer shell 2b Face outer shell 2c Crown outer shell 3 Inner surface 4 Metal plate 5 Peripheral edge 6 Depression 7 Hollow 8 Nugget 9 Clearance 10 Neck 11 Neck 11 Face 12 Crown DESCRIPTION OF SYMBOLS 13 Sole surface 13a Sole surface ridgeline 14 Mold 15 Mold 16 Injection 17 Cavity 18 Metal plate 19 Metal plate intermediate body 20 Electrode 21 Electrode 22 Depression 23 Weld bead

Claims (5)

[Claims] An inner shell of a metal golf club head having a hollow portion has a thickness of 0.1 mm to 1.0 mm.
A metal golf club head, characterized in that, when a metal plate having a thickness of 1 mm is joined by spot welding, a portion inside a peripheral portion of the metal plate is spot-welded. 2. The metal golf club head according to claim 1, wherein the metal golf club head is made of pure titanium or a titanium alloy, and the metal plate is made of a tungsten alloy having a specific gravity of 17 to 19. Golf club head. 3. A metal plate having a thickness of 0.1 mm to 1.0 mm is spot-welded to an inner surface of at least one of the plurality of outer shell members constituting a metal golf club head having a hollow portion. At the time of joining, after spot welding at a portion inside the peripheral edge of the metal plate, while joining and integrating the respective outer shell members with each other, the above-mentioned until the dent generated on the outer shell member surface by spot welding is eliminated. A method of manufacturing a metal golf club head, comprising polishing the surface of an outer shell member. 4. The metal golf club head has an area per spot welding of 0.2 to 1.0% of an area of the metal plate, and a total spot welding area is an area of the metal plate. The method for manufacturing a metal golf club head according to claim 3, wherein the content is 3 to 12%. 5. The metal golf club head according to claim 3, wherein the metal golf club head is made of pure titanium or a titanium alloy, and the metal plate is made of a tungsten alloy having a specific gravity of 17 to 19. A method for manufacturing a metal golf club head.