JP2968655B2 - Golf club head manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a golf club head comprising a hollow head body and a sole lid.

[0002]

2. Description of the Related Art Conventionally, golf club heads such as a driver are made of wood, and the above-mentioned wooden head is generally reinforced by attaching a metal plate to the sole surface and further attaching an insert such as resin to the face surface. Was. However, in recent years, golf clubs such as drivers having a metal or alloy head called metal wood (hereinafter referred to as metal wood) have also appeared, and this metal wood has increased the flight distance of a hit ball and has an accurate direction. It is easy and is increasingly replacing golf clubs such as drivers with wooden heads.

[0003] In particular, recently, a metal wood having excellent repulsion and corrosion resistance among metals or alloys and having a light head made of titanium or a titanium alloy has been proposed (see JP-A-63-154186). This titanium or titanium alloy head is, as shown in FIG.
The face shell piece 1, the upper shell piece 2 and the sole shell piece 3 are produced by pressing titanium or a titanium alloy, respectively. After the balance weight 4 is attached to the inner surface of the sole shell piece 3, The shell pieces 1, 2, and 3 were integrated by welding to produce a titanium or titanium alloy head.

[0004] The above-mentioned titanium or titanium alloy head has a problem that the welded portion is long. To solve this problem, a titanium or titanium alloy head having a small opening and a hollow portion is used. A head obtained by manufacturing most by precision casting, then fixing a balance weight into the cavity from the opening, and sealing the opening with a titanium or titanium alloy lid manufactured by pressing. Proposed.

[0005]

On the other hand, the lower the center of gravity of the head is, the more easily the ball can be raised and the club which can be hit easily can be obtained. In the case of a head made of titanium or a titanium alloy, since the entire head is made of the same kind of metal, there is a limit to significantly lowering the center of gravity of the head.

The present invention has been made in view of the above circumstances, and an object of the present invention is to make it possible to sufficiently exhibit the characteristics (light weight and excellent repulsion and corrosion resistance) of titanium or a titanium alloy. It is another object of the present invention to provide a method of manufacturing a golf club head capable of smoothly and reliably lowering the center of gravity of the head.

[0007]

In order to achieve the above object, the present invention provides a method of manufacturing a golf club head comprising a plurality of divided members, including at least a face portion and a neck portion. A hollow head body having an opening formed in the bottom surface is integrally cast with titanium or a titanium alloy, and a sole lid having a shape corresponding to the opening of the head body is made of metal heavier than the specific gravity of the head body. Then, a sole cover is fitted into the opening of the head body, a screw is inserted through a screw mounting hole formed in the sole cover, and the screw is screwed into the head body to fix the sole cover to the head body. After that, the screw mounting holes of the sole lid are buried.

[0008]

In the method of manufacturing a golf club head according to the present invention, the center of gravity of the entire head is lowered by using a sole lid having a higher specific gravity than the head body made of titanium or a titanium alloy. After screwing the screws, the screw mounting holes in the sole lid are buried to make the head of the screw invisible from the outside and to prevent the screw from coming off.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

In the figure, reference numeral 10 denotes a titanium alloy "for example, Ti-6" in a hollow formed in an alumina precision casting mold.
% Al-4% V (or more by weight) "is a metal wood head body produced by injecting and solidifying a molten metal. The alumina precision casting mold is produced by a lost wax method. In addition, the head body 10
A hollow part having an opening 11 formed on the bottom surface, a face part 14 having a face surface 13
, A neck portion 16 having a shaft hole 15 is formed. The opening 11 inside the head body 10
In the vicinity, four mounting seats 17 are formed, and screw holes 18 are formed in these mounting seats 17, respectively.

On the other hand, the sole lid 20 having the shape and size corresponding to the opening 11 has four projections 21 and one projection 22 formed on the inner surface thereof. Screw holes 24 and screw holes 24
Is formed. And, the sole cover 20
Is made of a cobalt alloy (for example, stellite) having a higher specific gravity than the head body 10 and having excellent wear resistance, and is precision-cast by the lost wax method similarly to the head body 10. At the outer edge of the sole lid 20, a step 25 is formed to fit into the opening 11 of the head body 10.

After the head body 10 and the sole lid 20 configured as described above are precision cast in advance, the balance weight 30 is screwed into the screw holes 24 of the sole lid 20 to adjust the weight balance. The step 25 of the sole lid 20 is fitted into the opening 11 of the head body 10, and then the four screw mounting holes 2 of the sole lid 20 are formed.
3 is screwed into the screw hole 18 of the mounting seat 17. Subsequently, the above screw mounting holes 23 and screw holes 2
4 is embedded from the outside of the sole lid 20 by welding and welding with the same material as the sole lid 20. Thereafter, the weld pile 32 is polished and finished to be the same as the surrounding sole surface. Thus, the sole lid 20 and the welded portion 32 cannot be distinguished from each other in appearance, and the screws 31 mounted in the screw mounting holes 23 and the screw holes 24 respectively.
Further, since the balance weight 30 is not visible from the outside and is completely hidden, the appearance is good and the luxury feeling of the head is not spoiled.

[0013]

As described above, the present invention relates to a method of manufacturing a golf club head comprising a plurality of divided members, comprising at least a face portion and a neck portion, and having an opening at a bottom surface. While the hollow head body formed with is formed integrally with titanium or a titanium alloy, a sole lid having a shape corresponding to the opening of the head body is manufactured from a metal heavier than the specific gravity of the head body. After inserting the screw into the screw mounting hole formed in this sole lid, screwing this screw into the head body and fixing the sole lid to the head body, Since the hole for mounting screws is embedded, the sole lid, which has a higher specific gravity than the head body made of titanium or titanium alloy, is used. To produce a product that can easily exhibit the characteristics (light weight and excellent repulsion and corrosion resistance), can lower the center of gravity of the head smoothly and reliably, and can easily lift the ball and hit easily. On the other hand, after fixing the head body and the sole lid with screws, you can easily hide the head of the screw from the outside by embedding the screw mounting hole of the sole lid, and it looks good In addition, the quality of the head is not impaired, and the screws can be prevented from coming off.

[Brief description of the drawings]

FIG. 1 is a sectional view of a golf club head showing one embodiment of the present invention.

FIG. 2 is a sectional view showing an example of a head body.

FIG. 3 is a bottom view showing an example of a sole lid.

FIG. 4 is an exploded perspective view of a conventional golf club head.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Head main body 11 Opening part 14 Face part 16 Neck part 20 Sole lid 23 Screw mounting hole 31 Screw 32 Weld pile

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) A63B 53/04

Claims (1)

(57) [Claims] 1. A method of manufacturing a golf club head comprising a plurality of divided members, wherein a hollow head body including at least a face portion and a neck portion and having an opening formed in a bottom surface is made of titanium. Alternatively, while integrally casting with a titanium alloy, a sole lid having a shape corresponding to the opening of the head main body is manufactured from a metal heavier than the specific gravity of the head main body, and the sole lid is fitted into the opening of the head main body. Inserting a screw into the screw mounting hole formed in this sole lid, screwing this screw into the head body, fixing the sole lid to the head body, and then embedding the screw mounting hole in the sole lid. Manufacturing method of a golf club head.