JP3086319B2 - 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 plurality of divided members.

[0002]

2. Description of the Related Art Conventionally, golf club heads such as drivers 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). As shown in FIG. 5, the head made of titanium or a titanium alloy is made by pressing face shell 1, top shell 2 and sole shell 3 by pressing titanium or titanium alloy, respectively. After attaching the balance weight 4 to the inner surface of the piece 3, the plurality of shell pieces 1, 2, and 3 are 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 has as its object to improve the properties (light weight and excellent repulsion and corrosion resistance) of titanium or a titanium alloy.
It is an object of the present invention to provide a method of manufacturing a golf club head which can sufficiently exhibit the above-mentioned characteristics and can smoothly and surely lower 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. After the sole lid is attached to the opening of the head body, a fixing member made of titanium or a titanium alloy is pressed against the outer edge of the sole lid, and the fixing member is fixed to the head body.

[0008]

In the method of manufacturing a golf club head according to the present invention, a sole lid having a specific gravity greater than that of a titanium or titanium alloy head body is used. By fixing the fixing member to the head main body while being sandwiched therebetween, the sole lid is smoothly and reliably attached to the head main body, and the center of gravity of the entire head is easily lowered.

[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
Is formed with a step portion 11a and a tapered portion 11b connected to the step portion 11a.

On the other hand, as shown in FIG. 3, a sole lid 20 having a shape and a size corresponding to the opening 11
The cross-section is formed in an inverted convex shape, and the outermost diameter thereof is formed slightly smaller than the maximum inner diameter of the step portion 11 a of the opening 11. The sole lid 20 is made of a metal having a higher specific gravity than the head body 10, such as a cobalt alloy (for example, stellite 31), a copper alloy (for example, arms bronze), or stainless steel, which has excellent wear resistance. Like the head body 10, it is precision cast by the lost wax method. In addition, pure T
The ring member 30 made of i is press-fitted, and the outermost diameter of the ring member 30 is formed to be slightly smaller than the maximum inner diameter of the step portion 11 a of the opening 11. Further, an annular notch 31 is formed at the outer edge of the ring member 30, and the notch 31 and the tapered portion 1 of the opening 11 are formed.
1b is fixed by welding (in FIG. 1, reference numeral 40 indicates a welded portion).

After the head body 10 and the sole lid 20 constructed as described above are precision-casted in advance, the head body 10 is formed by punching or the like at the step portion 11a and the tapered portion 11b of the opening 11 of the head body 10. Ring member 3
Then, the sole cover 20 in a state where the head body 10 is press-fitted is fitted, and then the annular gap formed between the notch 31 of the ring member 30 and the tapered portion 11b of the opening 11 is filled by welding to form the head body 10 and the ring. The member 30 is fixed. Thereby, the sole lid 20 is firmly fixed while being held between the ring member 30 and the head main body 10. In the golf club head assembled in this manner, the specific gravity of the sole lid 20 is different from that of the head body 10.
Since the club head is heavier, a club head having a low center of gravity can be easily manufactured. Further, when the sole lid 20 is formed of a cobalt alloy having excellent wear resistance (for example, stellite 31), it is most suitable for use as a fairway wood which requires the wear resistance of the sole.

[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 the sole lid is attached to the opening of the head, a fixing member made of titanium or a titanium alloy is pressed against the outer edge of the sole lid, and the fixing member is fixed to the head body. Use a sole lid that has a higher specific gravity than the head body of the head, and fix the sole lid between the fixing member made of titanium or titanium alloy and the head body. By fixing the member to the head body, the sole lid can be smoothly and securely attached to the head body, and the center of gravity of the entire head can be easily lowered. (Excellent repulsion and corrosion resistance), and a product in which the ball easily rises and is easy to hit can be easily manufactured.

[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 partial sectional view showing an example of a head main body.

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

FIG. 4 is a side view showing an example of a ring member.

FIG. 5 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 30 Ring member (fixing member)

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 body is manufactured from a metal heavier than the specific gravity of the head body, and after attaching the sole lid to the opening of the head body, And a fixing member made of titanium or a titanium alloy is pressed against an outer edge portion of the sole lid, and the fixing member is fixed to the head main body.