JP2002191726A - Golf club head and method for fabricating the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a golf club head wherein divided shell members are joined to each other through a proper amount of a welding material, while the members are being held so as to be spaced part a certain distance. SOLUTION: The golf club head is formed from at least two divided shell member (face member 2, head body 4) which are joined to each other. A joining part 2a is formed on the rear side perimeter of the face member. A plurality of void portion 2b, in each of which the thickness is cut off, are formed along the joined portion. The joining portion between the void portions are brought into contact with a joining portion 4a of the head body 4 to fill a welding material 12 into the void portions, thereby joining the divided members.

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 in which split shell members are joined to each other while maintaining a certain gap, and a method of manufacturing such a golf club head.

[0002]

2. Description of the Related Art Conventionally, golf club heads (particularly, hollow metal heads) have constituent members formed in accordance with respective portions.
These are integrated by welding to form a head.

For example, Japanese Patent Application Laid-Open No. 10-286332 discloses that a face member formed by integrating a hosel and a face and a hollow body member having an opening (joining end) on the face side are joined to each other. A formed golf rub head and a method of manufacturing the same are disclosed.

In this golf club head, a gap-forming projection is formed in the face direction from the joint end of the crown portion and the sole portion of the body member, and the gap-forming projection is located on the back side of the face of the face member. This is abutted against the joining end of the deviated portion, and joined with a welding material interposed in a gap formed at this time.

[0005]

By the way, in the conventional golf club head as described above, the welding material can be interposed with a certain gap kept between the main body member and the face member. There is such a problem.

Since the portion where the welding material adheres is a narrow portion of the joint end face between the main body member and the face member, if the welding material adheres to such a narrow portion, the welding material not only fills the gap but also fills the gap. However, it protrudes and solidifies just below the gap (for example, inside the head). this is,
Not only does this cause an increase in the weight of the golf club head, but the welded portion becomes thicker than other portions (especially the peripheral portion), causing damage due to stress concentration, and microscopic observation of the entire golf club head. There is a possibility that the repulsive force may be reduced by obstructing the actual bending.

Further, in performing a welding operation, it is difficult to position and maintain the joined end faces in a fixed state when welding the joined end faces of the main body member and the face member. For this reason, the main body member and the face member may be joined in a state where the joining end face is displaced, and the yield may be reduced.

The present invention has been made to solve such a problem, and a golf club head in which a split shell member is joined by an appropriate amount of welding material, and a method of manufacturing such a golf club head. The purpose is to provide.

[0009]

In order to achieve the above object, the present invention provides a hollow golf club head formed by joining at least two split shell members,
A joining portion is formed on at least one back side peripheral portion of the divided shell member to be joined, and a plurality of thinning portions in which the thickness is reduced in the thickness direction are formed along the joining portion, and between the plurality of thinning portions. The split shell member is joined by bringing the joint into contact with the joint of the other split shell member and filling the welded portion with the welding material.

Further, the present invention is a method of manufacturing a hollow golf club head formed by joining at least two split shell members, wherein the hollow golf club head is formed along at least one back peripheral edge of the joined split shell members. Filling the welded portion with the welding material while cutting the meat in the thickness direction to form a plurality of recessed portions and holding the portion between the plurality of recessed portions in contact with the other split shell member and holding the portion. It is characterized in that split shell members are joined.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a golf club head according to the present invention and a method for manufacturing the same will be described.

The golf club head applicable to the present invention includes both wood and iron.

In each of the embodiments described below, a case where the technical idea of the present invention is applied to a golf club head having a hollow head shape will be described as an example.

FIGS. 1 to 3 show a golf club head according to a first embodiment of the present invention and a method of manufacturing the same.

As shown in FIGS. 1 and 2, the golf club head according to the present embodiment is formed by joining at least two split shell members, and a back side peripheral edge of at least one of the split shell members to be joined. Is formed with a joint. A plurality of lightening portions are formed along the joining portion by reducing the thickness in the thickness direction, and the joining portion between the plurality of lightening portions is brought into contact with the joining portion of the other split shell member. The filling shell is filled with the welding material, so that the divided shell members are joined to each other.

In the present embodiment, a face member 2 and at least two other head bodies 4 (although not particularly designated by reference numerals, a sole portion, a top portion, a back face, a toe side surface, (A member composed of a heel side surface).

The head body 4 may be integrally formed by casting, forging, or the like so that the opening 6 is formed on the face side, or a plurality of split shell members (a sole portion, a top portion, and a back portion) formed by press molding. (Faces) may be formed by welding each other. In this case, as a constituent material of the head body 4, for example, stainless steel, maraging steel, titanium alloy, or the like can be used.

The face member 2 has an opening 6 in the head body 4.
It is formed to have a greater thickness (wider), and it is preferable to use the same or similar metal as the head body 4 as a constituent material. For example, if the head body 4 is made of Ti
Αβ titanium alloy such as -6Al-4V, face member 2
Can be a β-titanium alloy such as Ti-15Mo-5Zr-3Al, and the welding material 12 can be pure titanium.

In this embodiment, the face member 2
The joining portion 2a is formed on the back side peripheral portion of. In this case, the back side peripheral edge of the face member 2 corresponds to an edge portion along the outer periphery of the back surface 10 formed on the opposite side to the ball hitting surface (front surface) 8.

Each of the plurality of lightening portions 2b is formed intermittently along the back side peripheral edge, and is tapered outward. More specifically, each of the plurality of lightening portions 2b is formed so that the thickness thereof is continuously and smoothly reduced toward the outside. in this case,
The portion left without being tapered, that is, the joining portion 2a
Has the same thickness as the central portion of the face member 2. At the time of the welding process described later, the joining portion 2a itself melts and is fixed to the head main body 4 (joining portion 4a). In the present embodiment, four lightening portions 2b are disclosed in the drawings, but the present invention is not limited to this, and any number can be selected from the viewpoints of the type, purpose of use, and design of the head body 4. Only the lightened portion 2b can be formed.

In such a configuration, the face member 2
1 is in contact with a joint 4a formed on the opening 6 of the head main body 4 (formed on the end face of the outer shell constituting the head main body 4 on the opening 6 side) (FIG. 1). (A)
), A welding process is performed from the outside along the lightened portion 2b. During this welding process, a certain gap between the face member 2 and the head main body 4 (a gap where the lightening portion 2b is exposed).
Can be positioned and held. For this reason, the welding material 1 is filled along the lightening portion 2b so as to fill the lightening portion 2b.
2 can be stably penetrated (filled). Then, when the welding material 12 comes into contact with the head main body 4, the welding process can be reliably stopped (see FIG. 1B).

In this case, since the welding material 12 is surrounded by the thinned portion 2b and it takes time to fill the thinned portion 2b, it is necessary to prevent a large amount of the welding material 12 from adhering to the head main body 4 side. It is possible to prevent welding, and
2, the face member 2 can be securely fixed to the head main body 4. As a result, not only can the golf club head be reduced in weight, but also damage due to stress concentration, which has been a problem with conventional golf club heads, and rebound due to inhibition of microscopic bending of the entire head. Problems such as a decrease in force can be solved.

The face member 2 is formed thicker (wider) than the opening 6 of the head main body 4, so that
When the lightening portion 2b is formed on the face member 2, the thickness of the face member 2 can be made close to the thickness of the opening 6 of the head body 4, so that the welding process (the intrusion of the welding material 12) can be performed efficiently. The yield can be further improved.

After the above-described welding process is completed, the welding portion is polished and subjected to a finishing process. Also,
The type of the welding material 12 is not particularly limited, but it is preferable to use the welding material 12 made of the same material as the face member 2 and the head main body 4 in consideration of the joining strength and the like.

Here, a forming process of the face member 2 applied to the present embodiment will be described with reference to FIG.

As shown in FIG. 3A, first, the face constituting member 14 is formed. Specifically, a face component member 14 is formed by preparing a rolled metal plate material having substantially the same thickness and cutting out (for example, punching) the rolled metal plate material into the same contour shape as the face member 2. . In this case, it is preferable to form the face component member 14 so that the rolling direction of the metal plate matches the sole and top directions. If it is matched with the toe and heel directions, it is easy to break, so this can be prevented. In addition, by preparing a rolled metal sheet having substantially the same thickness, it is possible to eliminate the variation in the strength of the completed face member 2.

Next, as shown in FIG. 3 (b), a necessary area is cut (cut or polished) along a peripheral edge of the face component member 14 except for a portion to be the joint 2a. Thereby, a plurality of lightening portions 2b are formed. In this case, the width W of the lightened portion 2b is 1.0 to 15.
0 mm, and more preferably, 2.0 to 5.0 mm. In addition, the inclination angle θ of the meat dropout 2b is 5
It is good to be 60 degrees, more preferably 10 to 45 degrees. Further, since the width dimension W of the lightening portion 2b is larger than the thickness of the opening 6 of the head main body 4, the welding material 12 is easily taken into the lightening portion 2b, and the opening 6 of the head main body 4 is formed.
Does not adhere to the side in large quantities. Moreover, the opening 6 of the head body 4
The gap formed by the end face and the lightening portion is formed narrower inward, so that the welding material 12 stagnates once, then slowly enters, and can be reliably welded with a small amount of welding material. Becomes easier.

The rolled metal sheet material has an advantage that the unevenness of the strength distribution is small. If the metal sheet material is shaved to form the recess 2b, the metal sheet material is not plastically deformed. There is no fear that the strength of the completed face member 2 is reduced.

As another example of the method of forming the lightening portion 2b, a method of simultaneously forming a plurality of lightening portions 2b when the face member 2 is integrally formed by plastic working such as forging or casting. Is possible.

Finally, as shown in FIG. 3 (c), the face component member 14 is subjected to press working, and the ball striking surface (surface) 8 side is curved in a convex shape to form a bulge roll. Face member 2 applied to the embodiment
Can be formed.

As described above, according to the present embodiment, while the above-mentioned effects are mutually exerted, the thickness of the thinned portion 2b is reduced in at least one of the joining members (the face member 2 and the head body 4) in the thickness direction. By forming the above, it is possible to realize a golf club head capable of joining members with an appropriate amount of the welding material 12 while positioning and holding the members with a certain gap. Further, by forming the lightening portion 2b on the back side peripheral edge of the face member 2, the thickness of the central portion of the face can be processed so that the central portion is thicker and the peripheral portion is thinner. As a result, the strength on the center side can be increased to prevent the hitting surface 8 from being damaged, and at the same time, the strength on the peripheral side can be made smaller.
And the resilience of the ball can be improved.

Next, a golf club head according to a second embodiment of the present invention and a method for manufacturing the same will be described with reference to FIGS.

The present embodiment relates to an improvement of the face member 2, and the other structure is the same as that of the first embodiment. Therefore, in the following description, only the configuration of the face member 2 will be described, and the other configuration will be described in the first configuration.
The same reference numerals as those of the embodiment described above denote the same parts, and a description thereof will be omitted.

As shown in FIGS. 4 and 5, in the face member 2 applied to the present embodiment, the central portion of the back surface 10 is thickest (the thickened region is hereinafter referred to as the thick portion 10a).
), And the thickness thereof is continuously reduced from the central portion toward the peripheral portion (the thinned region is hereinafter referred to as the thin portion 1).
0b).

In such a face member 2, the plurality of lightening portions 2b are formed at the peripheral edge of the thin portion 10b, and the remaining portion without forming the lightening portion 2b is formed as a joining portion 2a. Have been. In this case, the thickness of the joining portion 2a is slightly smaller than the thickness of the thick portion 10a and the thickness of the thin portion 10b in the peripheral region adjacent to the thick portion 10a.

Here, a forming process of the face member 2 applied to the present embodiment will be described with reference to FIG.

As shown in FIGS. 6A and 6B, first,
The face component 16 is formed. Specifically, a rolled metal plate having substantially the same thickness is prepared, and the rolled metal plate is cut out (for example, punched) into the same contour shape as the face member 2 to form the face component member 16. In this case, it is preferable that the face component 16 be formed such that the rolling direction of the metal plate coincides with the sole and top directions. If it is matched with the toe and heel directions, it is easy to break, so this can be prevented. In addition, by preparing a rolled metal sheet having substantially the same thickness, it is possible to eliminate the variation in the strength of the completed face member 2.

Then, the thickness of the peripheral region (thin portion 10b) of one face of the face component member 16 is reduced except for the central portion (thick portion 10a). That is, processing is performed on one surface of the face component member 16 so that the thickness of the face component member 16 is continuously reduced with a downward gradient from the central portion toward the peripheral edge. In this case, the downward slope angle r of the thin portion 10b is preferably set in a range of approximately 0.1 to 10 degrees. As a method of forming such a surface, for example, shaving,
Methods such as forging and casting can be appropriately selected or used in combination.

The rolled metal sheet has the advantage that the unevenness of the strength distribution is small. If the thinned portion 10b is formed by shaving the metal sheet, the metal sheet is not plastically deformed. , Completed face member 2
There is no need to worry about lowering the strength of the steel. In addition, when the thinned portion 10b is cut and processed at the same time as the thinned portion 2b is cut, the work can be performed in series and the efficiency is high.

Next, as shown in FIG. 6C, a necessary area is cut (cut or polished) along the peripheral edge of the face component member 14 except for a portion to be the joint 2a. Thereby, a plurality of lightening portions 2b are formed. Note that the width dimension W and the inclination angle θ of the lightening portion 2b are the same as those in the first embodiment, and a description thereof will be omitted.

The rolled metal sheet has the advantage that the unevenness of the strength distribution is small. When the metal sheet is shaved to form the recess 2b, the plasticity of the metal sheet does not change. Therefore, there is no fear that the strength of the completed face member 2 is reduced.

As another example of the method of forming the recess 2b, a method of forming a plurality of recesses 2b simultaneously when the face member 2 is integrally formed by plastic working such as forging or casting. Is possible.

Finally, as shown in FIG. 6 (c), the face component member 14 is subjected to press working, and the ball striking surface (surface) 8 side is curved in a convex shape to form a bulge roll. Face member 2 applied to the embodiment
Can be formed.

As described above, according to the present embodiment, by increasing the thickness of the central portion of the face member 2, the strength near the impact can be increased, and the breakage can be prevented. By thinning the periphery,
It is possible to improve the microscopic bending resilience caused by the impact stress.

The other configuration and operation and effect are the same as those of the first embodiment, and the description is omitted.

Next, a golf club head and a method of manufacturing the same according to a third embodiment of the present invention will be described with reference to FIGS.

The present embodiment relates to an improvement of the face member 2, and the other structure is the same as that of the first embodiment. Therefore, in the following description, only the configuration of the face member 2 will be described, and the other configuration will be described in the first configuration.
The same reference numerals as those of the embodiment described above denote the same parts, and a description thereof will be omitted.

As shown in FIG. 7 and FIG. 8, the face member 2 applied to the present embodiment has a recessed step-shaped lightening portion 2b intermittently formed on the peripheral edge of the back surface 10 thereof. . A joining portion 2a is formed in a portion remaining without forming the lightening portion 2b.
The thickness of “a” is the same as the face center portion.

Here, a process of forming the face member 2 applied to the present embodiment will be described with reference to FIG.

As shown in FIG. 9A, first, the face constituting member 18 is formed. Specifically, a rolled metal plate having substantially the same thickness is prepared, and the rolled metal plate is cut out (for example, punched) into the same contour shape as the face member 2, thereby forming the face component member 18. . In this case, it is preferable to form the face component 18 such that the rolling direction of the metal plate matches the sole and top directions. If it is matched with the toe and heel directions, it is easy to break, so this can be prevented. Further, by preparing a rolled metal plate having substantially the same thickness, it is possible to eliminate the variation in strength of the completed face member 2.

Next, as shown in FIG. 9B, a necessary area is cut (cut or polished) along the peripheral edge of the face component member 14 except for a portion to be the joint 2a. Thereby, a plurality of lightening portions 2b are formed. In this case, the width W of the lightened portion 2b is 1.0 to 15.
0 mm, and more preferably, 2.0 to 5.0 mm. The stepped depth h of the recess 2b is 0.5 to 3.0 mm, more preferably 1.0 to 3.0 mm.
It is good to be 2.5 mm. Further, the width dimension W of the lightening portion 2b is larger than the thickness of the opening 6 of the head body 4, so that the welding material 12 is easily taken into the lightening portion 2b, and a large amount of the welding material 12 enters the opening 6 side of the head body 4. Does not adhere.

The rolled metal sheet has the advantage that the unevenness of the strength distribution is small. When the metal sheet is shaved to form the recess 2b, the plasticity of the metal sheet does not change. Therefore, there is no fear that the strength of the completed face member 2 is reduced.

As another example of the method of forming the lightening portions 2b, a method of simultaneously forming a plurality of lightening portions 2b when the face member 2 is integrally formed by plastic working such as forging or casting. Is possible.

Finally, as shown in FIG. 9C, the face component member 14 is subjected to press working, and the ball striking surface (surface) 8 side is curved in a convex shape to form a bulge roll. Face member 2 applied to the embodiment
Can be formed.

As described above, according to the present embodiment, when the welding material 12 is filled by forming the recessed portion 2b into a recessed step shape, the welding material 12 is temporarily stepped into the recessed portion 2b. Since it stagnates into the back wall and slowly enters, a large amount of the welding material 12 does not flow into the interior at once. For this reason, excessive filling of the welding material 12 can be prevented, and the face member 2 can be securely fixed to the head main body 4 with an appropriate amount of the welding material 12. As a result, not only can the golf club head be reduced in weight, but also damage due to stress concentration, which has been a problem with conventional golf club heads, and rebound due to inhibition of microscopic bending of the entire head. Problems such as a decrease in force can be solved.

The other constructions and effects are the same as those of the first embodiment.
Since the third embodiment is the same as the first embodiment, the description thereof is omitted.

Next, a golf club head and a method of manufacturing the same according to a fourth embodiment of the present invention will be described with reference to FIGS.

As shown in FIGS. 10 and 11, in the present embodiment, a sole member 3 and another head body 4 are assumed as at least two divided shell members.

The head body 4 may be integrally formed by casting, forging, or the like so as to form the opening 6 ′ on the sole side, or a plurality of press-formed split shell members (the face portion 2, the top portion, etc.). , Back face) may be formed by welding each other. In this case, as a constituent material of the head body 4, for example, stainless steel, maraging steel, titanium alloy, or the like can be used.

The sole member 3 is provided with an opening 6 ′ of the head body 4.
It is formed to have a greater thickness (wider), and it is preferable to use the same or similar metal as the head body 4 as a constituent material.

In this embodiment, a joint 3a is formed on the back side peripheral edge of the sole member 3. In this case, the back side peripheral portion of the sole member 3 corresponds to the back surface 11 formed on the side opposite to the ground surface (front surface) 9 at the time of addressing.
Refers to the portion of the edge along the outer circumference.

Each of the plurality of lightened portions 3b is formed intermittently along the back side peripheral portion, and is tapered outward. More specifically, each of the plurality of lightening portions 3b is formed so that its thickness is continuously and smoothly reduced toward the outside. in this case,
The portion left without being tapered, that is, the joint 3a
Has the same thickness as the central portion of the sole member 3.
Then, at the time of a welding process described later, the joining portion 3a itself melts and is fixed to the head main body 4 (the joining portion 4b). In the present embodiment, 4
Although one lightening portion 3b is disclosed, the present invention is not limited to this, and it is possible to form an arbitrary number of lightening portions 3b from the viewpoint of the type, purpose of use, and design of the head body 4. is there.

In such a configuration, when the joint 3a of the sole member 3 is brought into contact with the joint 4b formed in the opening 6 'of the head body 4 (see FIG. 10A), A welding process is performed from the outside along 3b. During this welding process, it is possible to position and maintain a certain gap (gap where the lightening portion 3b is exposed) between the sole member 3 and the head body 4. For this reason, it is possible to stably intrude (fill) the welding material 12 so as to fill the lightening portion 3b and along the lightening portion 3b. And the welding material 12
It is possible to reliably stop the welding process when the contact is made with the head body 4 (see FIG. 10B).

In this case, a large amount of the welding material 12 can be prevented from adhering to the head body 4 side, and the sole member 3 can be securely fixed to the head body 4 with an appropriate amount of the welding material 12. . As a result, the weight of the golf club head can be reduced.

After the above-described welding process is completed, the welded portion is polished and finished. Also,
The type of the welding material 12 is not particularly limited, but it is preferable to use the welding material 12 made of the same material as the sole member 3 and the head main body 4 in consideration of the joining strength and the like.

Here, a forming process of the sole member 3 applied to the present embodiment will be described with reference to FIG.

As shown in FIG. 12A, first, a sole component member 19 is formed. Specifically, by cutting out (for example, punching) into the same contour shape as 3, the sole prepares a rolled metal sheet material formed with substantially the same thickness,
The rolled metal sheet is used to form a sole member constituting member 19. In this case, it is possible to eliminate the variation in the strength of the completed sole member 3 by preparing a rolled metal sheet having substantially the same thickness.

Next, as shown in FIG. 12 (b), a necessary area is cut (cut or polished) along the peripheral edge of the sole component member 19 except for a portion serving as the joint 3a. Thus, a plurality of lightening portions 3b are formed, and the sole member 3 is completed. In this case, the width dimension W 'of the lightening portion 3b
As 1.0 to 15.0 mm, more preferably,
It is good to be 2.0-5.0 mm. In addition, meat dropping part 3
The inclination angle θ ′ of b is preferably 5 to 60 degrees, more preferably 10 to 45 degrees.

The rolled metal sheet has the advantage that the unevenness of the strength distribution is small. If the metal sheet is shaved to form the recess 3b, the metal sheet is not plastically deformed. There is no fear that the strength of the completed sole member 3 is reduced.

As another example of the method of forming the lightening portions 3b, a method of simultaneously forming a plurality of lightening portions 3b when the sole member 3 is integrally formed by plastic working such as forging or casting. Is possible.

The contour shape of the sole member 3 is as follows.
A flat shape as shown in FIG. 12 may be used, or the sole member 3 may be subjected to press working so that the grounding surface (surface) 9 side is curved in a convex shape.

As described above, according to the present embodiment, the members (sole member 3,
By forming a thinned portion 3b in which the thickness is reduced in at least one of the head main bodies 4), the members are positioned and held at a fixed gap and an appropriate amount of the welding material 12 is formed.
Thus, a golf club head that can be joined with the golf club head can be realized.

In each of the above-described embodiments, the face member 2 and the sole member 3
However, the present invention is not limited to this, and the technology of the present invention may be applied to a top or a hosel.

[0074]

According to the present invention, an appropriate amount of welding material can be obtained while positioning and holding the members at a constant gap by forming a thinned portion in the thickness direction on at least one of the members to be joined. And a manufacturing method capable of manufacturing such a golf club head.

[Brief description of the drawings]

FIGS. 1A and 1B are cross-sectional views illustrating a configuration of a golf club head according to a first embodiment of the present invention, in which FIG. 1A illustrates a state in which a face member is in contact with a head body, and FIG.
FIG. 4 is a diagram showing a state where the face member is welded to the head main body.

FIG. 2 is a perspective view showing a configuration of a joint portion and a lightening portion formed on the back surface of the face member.

FIGS. 3A to 3C are views showing a process of forming a face member.

4A and 4B are cross-sectional views illustrating a configuration of a golf club head according to a second embodiment of the present invention, wherein FIG. 4A is a diagram illustrating a state in which a face member is in contact with a head body, and FIG.
FIG. 4 is a diagram showing a state where the face member is welded to the head main body.

FIG. 5 is a perspective view showing a configuration of a joint portion and a lightening portion formed on the back surface of the face member.

FIGS. 6A to 6D are views showing a process of forming a face member.

7A and 7B are cross-sectional views illustrating a configuration of a golf club head according to a third embodiment of the present invention, wherein FIG. 7A is a diagram illustrating a state in which a face member is in contact with a head body, and FIG.
FIG. 4 is a diagram showing a state where the face member is welded to the head main body.

FIG. 8 is a perspective view showing a configuration of a joint portion and a lightening portion formed on the back surface of the face member.

FIGS. 9A to 9C are diagrams showing a process of forming a face member.

FIGS. 10A and 10B are cross-sectional views illustrating a configuration of a golf club head according to a fourth embodiment of the present invention, in which FIG. 10A illustrates a state in which a sole member is in contact with a head body, and FIG.
FIG. 4 is a diagram showing a state in which the sole member is welded to the head main body.

FIG. 11 is a perspective view showing a configuration of a joint portion and a lightening portion formed on the back surface of the sole member.

FIGS. 12A and 12B are diagrams showing a forming process of a sole member.

[Explanation of symbols]

 Reference Signs List 2 face member 2a joining portion 2b lightening portion 4 head body 4a joining portion 12 welding material

Claims (2)

[Claims] 1. A hollow golf club head formed by joining at least two split shell members, wherein at least one of the split shell members to be joined forms a joining portion on the back side peripheral edge, and the joining portion has Along with forming a plurality of lightening portions in which the thickness is reduced in the thickness direction, a joining portion between the plurality of lightening portions is brought into contact with a joining portion of the other split shell member, and a welding material is applied to the lightening portion. A golf club head in which divided shell members are joined by filling. 2. A method of manufacturing a hollow golf club head formed by joining at least two split shell members, wherein the thickness is increased in a thickness direction along a back peripheral edge of at least one of the split shell members to be joined. To form a plurality of lightening portions, and filling the thinning portion with a welding material while holding the portion between the plurality of lightening portions in contact with the other split shell member, thereby forming the split shell member. A method for manufacturing a golf club head, wherein the heads are joined.