JP2005000576A - Method for manufacturing hollow golf club head - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hollow golf club head manufacturing method in which different materials are firmly adhered to obtain sufficient joining strength against the hit of a ball. <P>SOLUTION: A blind shell 15 is connected to a ring shape shell 13 from at least the side of a hollow part 7. Then, the ring shape shell 13 is connected to a face shell 11 by welding. Before the hollow part 7 is clogged by connecting the face shell 11, the blind shell 15 and the ring shape shell 13, being different kinds of metal, are connected even from the hollow part 7 of the head 1, so that the connection part of the different materials is firmly fixed to acquire sufficient joining strength against the hit of the ball. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for manufacturing a hollow golf club head.
[0002]
[Prior art]
In recent years, hollow golf club heads formed from metal shells have tended to increase in size, and those with a volume of 300 cc or less were the mainstream until several years ago due to restrictions in manufacturing technology and strength, Currently over 300cc and around 400cc are becoming mainstream. However, even when the head is enlarged, the head weight needs to be 200 g or less as usual due to the problem of swing balance, and how to increase the size without increasing the weight is an important issue. .
[0003]
As a method for solving this problem, the applicant discloses in JP-A-2002-253706 a method in which the head can be enlarged without increasing the weight by partially reducing the thickness. However, since the strength of the head inevitably decreases when the thickness is reduced, this method has a limit in increasing the size of the head.
[0004]
Further, as disclosed in JP-A-7-155410, JP-A-9-215786, and JP-A-5-20768, a head formed by combining different materials is known. By applying such a method of combining different materials and using a material having a small specific gravity at an appropriate position, the head can be enlarged. However, in the heads disclosed in these, a hollow portion is formed by joining different materials so as to block the openings of a plurality of members, and joining from the hollow portion side of the head is impossible. There has been a problem that it is not possible to obtain a sufficient strength to withstand the impact of the ball hit. In particular, when bonding is performed only from the outside of the head, there is a concern that the bonding area is reduced by polishing performed on the outer surface of the head for finishing, and the strength of the bonding portion is reduced.
[0005]
[Patent Document 1]
JP 2002-253706 A [Patent Document 2]
JP 7-155410 A [Patent Document 3]
Japanese Patent Laid-Open No. 9-215786 [Patent Document 4]
Japanese Utility Model Laid-Open No. 5-20768 [0006]
[Problems to be solved by the invention]
An object of the present invention is to provide a method of manufacturing a hollow golf club head that can firmly fix different materials and can obtain a sufficient bonding strength against a ball hit.
[0007]
[Means for Solving the Problems]
According to the invention of claim 1, a rear shell is provided in the rear portion of the face shell through a hollow portion, and the rear shell is provided with a ring-shaped shell positioned on the face shell side and a rear surface disposed behind the ring-shaped shell. A bottomed shell having a bottom, wherein the face shell and the ring-shaped shell are formed of a metal material made of the same main component, and the bottomed shell is made of a material having a specific gravity smaller than that of the face shell and the ring-shaped shell. A method for manufacturing a formed hollow golf club head, wherein the bottomed shell and the ring-shaped shell are connected at least from the hollow portion side, and then the ring-shaped shell and the face shell are connected by welding. A method for producing a hollow golf club head characterized by:
[0008]
According to the first aspect of the present invention, the bottomed shell and the ring-shaped shell made of different metals can be connected from the hollow portion side of the head before the face shell is connected and the hollow portion is closed, Can be firmly fixed, and a sufficient bonding strength can be obtained with respect to the ball hitting. As a result, the center of gravity can be arbitrarily adjusted by increasing the size of the head, or by using a heavier weight to lower the center of gravity and deep center of gravity, thereby providing a more functional golf club.
[0009]
The invention according to claim 2 is the method for producing a hollow golf club head according to claim 1, further comprising a fixing means on the hollow portion side of the connecting portion between the bottomed shell and the ring-shaped shell. .
[0010]
According to this configuration, the hollow portion side of the connecting portion between the bottomed shell and the ring-shaped shell can be firmly connected by the fixing means.
[0011]
The invention according to claim 3 is characterized in that the face shell has a protrusion protruding backward from the periphery of the face portion, and the protrusion and the ring-shaped shell are connected by laser welding. 2. A method for producing a hollow golf club head according to 2.
[0012]
According to the configuration of the third aspect, it is easy to perform laser welding by having the protruding portion, and by using laser welding, the heat affected zone can be reduced, and the adverse effect due to heat on the joined portion of the ring-shaped shell and the bottomed shell. Can be avoided, and the strength of the joint can be ensured.
[0013]
The invention of claim 4 is characterized in that the face shell and the ring-shaped shell are made of titanium or a titanium alloy, and the bottomed shell is made of aluminum or an aluminum alloy. 2. A method for producing a hollow golf club head according to item 1.
[0014]
According to the construction of claim 4, the use of high-strength titanium or titanium alloy for the face shell and low specific gravity aluminum or aluminum alloy for the bottomed shell increases the size of the head without increasing the weight. Can be achieved.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. A metal hollow golf club head (hereinafter referred to as a head) 1 has a face portion 2 as a hitting surface on the front surface, a crown 3 on the top surface, a sole portion 4 on the bottom surface, and a side peripheral portion 5 on the side surface. A shaft (not shown) having a grip at the upper end is connected to the hosel 6 formed on one side.
[0016]
The head 1 is divided into a plurality of divided metal shells, a face shell 11 forming the front of the head 1, and a rear portion of the face shell 11 via a hollow portion 7 to form the rear of the head 1. The rear shell 12 is integrally joined. The rear shell 12 is further formed of a ring-shaped shell 13 positioned on the face shell 11 side, and a bottomed shell 15 having a bottom 14 disposed behind the ring-shaped shell 13, and the bottomed shell 15 is a crown. 3, a sole part 4 and a rear part of the side peripheral part 5 are formed and opened forward. The entire ring-shaped shell 13 is sandwiched between the face shell 11 and the bottomed shell 15 and is formed in a continuous ring shape. The crown 3 and the sole portion 4 of the rear shell 12 are formed. , The front part of the side periphery 5 is formed. The face shell 11 is not in direct contact with the bottomed shell 15. The face shell 11 and the ring-shaped shell 13 are made of titanium or a titanium alloy, and the bottomed shell 15 is made of aluminum or an aluminum alloy having a specific gravity smaller than that of titanium or the titanium alloy. The bottomed shell 15 has a specific gravity smaller than that of titanium or a titanium alloy and is not limited to aluminum or an aluminum alloy but may be formed of, for example, FRP as long as it has a certain degree of strength.
[0017]
Further, the hollow portion 7 side of the connecting portion between the bottomed shell 15 and the ring-shaped shell 13 has a protrusion 16 serving as an adhering means, and the protrusion 16 extends rearward from the ring-shaped shell 13. And is integrally formed. And this protrusion 16 fits into the hollow part 7 side of the front end of the bottomed shell 15, and the bottomed shell 15 and the ring-shaped shell 13 are bonded and bonded by an adhesive from both the hollow part 7 side and the outside side. They are joined by fastening or welding.
[0018]
The face shell 11 has a projecting portion 17 projecting rearward from the periphery of the face portion 2 and opening rearward. The face shell 11 forms the front end portion of the face portion 2, the crown 3, the sole 4, and the side peripheral portion 5. ing. The front end of the ring-shaped shell 13 formed in a ring shape is joined to the rear end of the protrusion 17 by laser welding. A balance weight 18 for adjusting the balance as the center of gravity position of the head 1 is fixed to the back bottom portion 14 of the bottomed shell 15.
[0019]
The bottomed shell 15 is integrated by welding or the like to the back bottom shell 19 that forms the back bottom portion 14 as the rear portion of the sole portion 4 and the side peripheral portion 5 and the end of the back top shell 20 that forms the back portion of the crown 3. It is formed by joining. The hosel 6 is formed integrally with the ring-shaped shell 13.
[0020]
Next, a manufacturing method will be described. First, a metal thin plate as a raw material is punched out, pressed and bent to form a face shell 11, a ring-shaped shell 13, a deep bottom shell 19, and a deep upper shell 20, respectively. The shells 11, 13, 19, and 20 may be manufactured by hot forging or casting. Further, the ring-shaped shell 13 in which the hosel 6 is integrally formed is obtained by joining the ring-shaped portion of the separately formed ring-shaped shell 13 and the pipe-shaped hosel 6 by welding or the like, or hot forging a metal lump. For example, the ring-shaped shell 13 provided with the hosel 6 may be integrally formed.
[0021]
When the ring-shaped portion of the ring-shaped shell 13 in which the ring-shaped shell 13 is separately formed and the pipe-shaped hosel 6 are joined together by welding or the like, for convenience of joining the hosel 6, the hosel 6 of the ring-shaped portion. A notch portion may be formed in a portion to which the hosel 6 is joined, and the hosel 6 may be joined to the notch. In this case, even if the ring-shaped portion is formed in an end shape having an end portion that is completely cut at the notch portion to which the hosel 6 is joined, the ring-shaped portion has a notch portion in a part thereof, but is formed in a ring shape over the entire circumference. You may form it in the endless form which is continuous and does not have an edge part.
[0022]
Then, the ends of the back bottom shell 19 and the back top shell 20 are joined by welding or the like to form the bottomed shell 15, and then the rear end of the ring-shaped shell 13 is connected to the front end of the bottomed shell 15. A balance weight 18 is fixed to the hollow portion 7 side of the bottom shell 19. When connecting the bottomed shell 15 and the ring-shaped shell 13, the protrusion 16 of the ring-shaped shell 13 is fitted to the hollow portion 7 side that is the inner side of the bottomed shell 15, and the ring-shaped shell 13 is connected from the hollow portion 7 side. And the bottomed shell 15 are joined using screws, brazing, or an adhesive, and are also joined using screws, brazing, an adhesive, or the like from the outside, which is the outer side opposite to the hollow portion 7 side. . Since the bottomed shell 15 is made of aluminum or an aluminum alloy and the ring-shaped shell 13 is made of titanium or a titanium alloy, the ring-shaped shell 13 and the bottomed shell 15 cannot be joined by ordinary welding. Bonding by diffusion bonding is also possible.
[0023]
By fitting the protrusion 16 of the ring-shaped shell 13 to the hollow portion 7 side that is the inner side of the bottomed shell 15 and increasing the contact area between the ring-shaped shell 13 and the bottomed shell 15, the ring-shaped shell 13 and the By fixing the bottom shell 15 and connecting the bottomed shell 15 and the ring-shaped shell 13 from the hollow portion 7 side and the outside, the bottomed shell 15 and the ring-shaped shell 13 can be connected more firmly. In this case, since the front side of the ring-shaped shell 13 is open, the bottomed shell 15 and the ring-shaped shell 13 can be easily connected from the hollow portion 7 side. And even if the external side of the connection part of the bottomed shell 15 and the ring-shaped shell 13 is scraped by surface polishing for adjusting the appearance of the post-process, the bonding strength between the bottomed shell 15 and the ring-shaped shell 13 may be reduced. Absent.
[0024]
Thereafter, the front end of the ring-shaped shell 13 and the rear end of the protruding portion 17 protruding rearward of the face shell 11 are connected by laser welding, and the assembly of the head 1 is completed. In this case, the face shell 11 has the protrusions 17 so that laser welding can be easily performed. Further, by using laser welding, the heat affected zone can be reduced, and it is possible to avoid the adverse effect of heat on the joint between the dissimilar metals of the ring-shaped shell 13 and the bottomed shell 15. The strength of the joint portion of the shell 15 can be ensured.
[0025]
Then, the surface of the head 1 that has been assembled is polished to level the unevenness of the surface of the head 1 such as the connection portion and the welded portion, and the angle of the loft, lie, etc. is adjusted and painted as necessary. Finish. Finally, the shaft is inserted into the hosel 6 to complete the golf club.
[0026]
As described above, in the above embodiment, the rear shell 12 is provided at the rear portion of the face shell 11 via the hollow portion 7, and the rear shell 12 includes the ring-shaped shell 13 positioned on the face shell 11 side and the ring shell 13. A bottomed shell 15 having a bottom 14 disposed behind the shell 13, and the face shell 11 and the ring-shaped shell 13 are made of the same metal material, and the bottomed shell 15 Is a method for manufacturing a hollow golf club head formed of a material having a specific gravity smaller than that of the face shell 11 and the ring-shaped shell 13, wherein the bottomed shell 15 and the ring-shaped shell 13 are at least on the hollow portion 7 side. After the connection, the ring-shaped shell 13 and the face shell 11 are connected by welding. Therefore, before the face shell 11 is connected and the hollow portion 7 is closed, the hollow portion 7 side of the head 1 is also connected. Can be connected with a bottom shell 15 and the ring Jokara 13 species between metals, connecting portions of different materials can be more firmly fixed, it is possible to obtain a sufficient bonding strength with respect to the striking of the ball. As a result, the center of gravity can be arbitrarily adjusted by increasing the size of the head, or by using a heavier weight to lower the center of gravity and deep center of gravity, thereby providing a more functional golf club.
[0027]
Further, since the projecting portion 16 serving as the fixing means is provided on the hollow portion 7 side of the connecting portion between the bottomed shell 15 and the ring-shaped shell 13, the bottomed shell 15 and the ring-shaped shell 13 are connected by the projecting portion 16. The hollow part 7 side of the connection part can be firmly connected.
[0028]
Further, the face shell 11 has a projecting portion 17 projecting rearward from the periphery of the face portion 2, and the projecting portion 17 and the ring-shaped shell 13 are connected by laser welding. It is easy to perform laser welding, and by using laser welding, the heat-affected zone can be reduced, the adverse effect of heat on the joint between the ring-shaped shell 13 and the bottomed shell 15 can be avoided, and the strength of the joint is ensured. be able to.
[0029]
Further, since the face shell 11 and the ring-shaped shell 13 are made of titanium or a titanium alloy, and the bottomed shell 15 is made of aluminum or an aluminum alloy, the face shell 11 is made of high-strength titanium or titanium alloy. By using low specific gravity aluminum or aluminum alloy for the bottomed shell 15, it is possible to increase the size of the head without increasing the weight.
[0030]
In addition, this invention is not limited to the said Example, A various deformation | transformation implementation is possible within the range of the summary of this invention. In the embodiment, the case of a hollow metal head is shown, but the present invention can also be applied to a hollow iron head. Further, in the embodiment, the bottomed shell 15 is formed of the back bottom shell 19 and the back top shell 20, but the bottomed shell may be formed integrally from the beginning.
[0031]
【The invention's effect】
According to the invention of claim 1, a rear shell is provided in the rear portion of the face shell through a hollow portion, and the rear shell is provided with a ring-shaped shell positioned on the face shell side and a rear surface disposed behind the ring-shaped shell. A bottomed shell having a bottom, wherein the face shell and the ring-shaped shell are formed of a metal material made of the same main component, and the bottomed shell is made of a material having a specific gravity smaller than that of the face shell and the ring-shaped shell. A method for manufacturing a formed hollow golf club head, wherein the bottomed shell and the ring-shaped shell are connected at least from the hollow portion side, and then the ring-shaped shell and the face shell are connected by welding. A hollow golf club head manufacturing method characterized in that, before the face shell is connected and the hollow portion is blocked, the bottomed shell and the ring-shaped shell of different metals can be connected also from the hollow portion side of the head. In, connection of different materials can be more firmly fixed, it is possible to obtain a sufficient bonding strength with respect to the striking of the ball. As a result, the center of gravity can be arbitrarily adjusted by increasing the size of the head, or by using a heavier weight to lower the center of gravity and deep center of gravity, thereby providing a more functional golf club.
[0032]
The invention according to claim 2 is the method for producing a hollow golf club head according to claim 1, further comprising a fixing means on the hollow portion side of the connecting portion between the bottomed shell and the ring-shaped shell. The hollow portion side of the connecting portion between the bottomed shell and the ring-shaped shell can be firmly connected by the fixing means.
[0033]
According to a third aspect of the present invention, the face shell has a protrusion that protrudes backward from the periphery of the face portion, and the protrusion and the ring-shaped shell are connected by laser welding. 2. A method for manufacturing a hollow golf club head according to claim 2, wherein laser welding is facilitated by having a protrusion, and by using laser welding, a heat-affected zone can be reduced, and at the joint between the ring-shaped shell and the bottomed shell. The adverse effect of heat can be avoided, and the strength of the joint can be ensured.
[0034]
The invention according to claim 4 is characterized in that the face shell and the ring-shaped shell are made of titanium or a titanium alloy, and the bottomed shell is made of aluminum or an aluminum alloy. 2. A method for producing a hollow golf club head according to claim 1, wherein high strength titanium or titanium alloy is used for the face shell and low specific gravity aluminum or aluminum alloy is used for the bottomed shell without increasing the weight. The size of the head can be increased.
[Brief description of the drawings]
FIG. 1 is a top view showing an embodiment of the present invention.
FIG. 2 is an exploded sectional view taken along line AA ′ showing an embodiment of the present invention.
[Explanation of symbols]
2 Face portion 7 Hollow portion 11 Face shell 12 Rear shell 13 Ring-shaped shell 14 Deep bottom portion 15 Bottomed shell 16 Projection (fixing means)
17 Projection

Claims (4)

A rear shell is provided at a rear portion of the face shell through a hollow portion, and the rear shell is a ring-shaped shell positioned on the face shell side, and a bottomed shell having a deep bottom portion disposed behind the ring-shaped shell, A hollow golf club head in which the face shell and the ring-shaped shell are formed of a metal material having the same main component, and the bottomed shell is formed of a material having a specific gravity smaller than that of the face shell and the ring-shaped shell. A hollow golf club, comprising: connecting the bottomed shell and the ring-shaped shell from at least the hollow portion side, and then connecting the ring-shaped shell and the face shell by welding. Manufacturing method of the head. 2. The method for manufacturing a hollow golf club head according to claim 1, further comprising a fixing means on the hollow portion side of the connecting portion between the bottomed shell and the ring-shaped shell. 3. The hollow golf club head according to claim 1, wherein the face shell has a protruding portion that protrudes rearward from the periphery of the face portion, and the protruding portion and the ring-shaped shell are connected by laser welding. Manufacturing method. 4. The hollow golf club according to claim 1, wherein the face shell and the ring-shaped shell are made of titanium or a titanium alloy, and the bottomed shell is made of aluminum or an aluminum alloy. Manufacturing method of the head.

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