JP2626020B2 - Golf club head manufacturing method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method of manufacturing a golf club head made of titanium or a titanium alloy having a cavity therein, and more particularly to a method of manufacturing a titanium alloy called metal wood. The present invention relates to a method for manufacturing a golf club head.

[Conventional technology]

2. Description of the Related Art Conventionally, golf club heads such as drivers are made of wood, and the 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. However, in recent years, golf clubs such as a driver having a metal or alloy head called a metal wood (hereinafter, referred to as a metal wood) have also appeared, and the metal wood has increased the flight distance of a hit ball and has an accurate direction. It is easy and is gradually replacing golf clubs such as drivers with wooden heads.

Particularly recently, a metal wood having excellent repulsion and corrosion resistance among metals or alloys and having a light titanium alloy head has been proposed (JP-A-63-154186).
Reference). As shown in FIG. 5, this titanium alloy head is manufactured by pressing a face shell 11, an upper shell 12 and a sole shell 13 by respectively pressing a titanium alloy. After mounting the balance weight 14 on the inner surface, the plurality of shell pieces 11, 12, and 13 were integrated by welding to produce a titanium alloy head.

[Problems to be solved by the invention]

It takes skill to cleanly weld a plurality of press-formed titanium alloy shell pieces, and the weld bead obtained by welding is ground and polished to smooth the surface. The longer the length of the welded portion, the higher the manufacturing cost.

In addition, when welding a plurality of press-formed shell pieces having a forged structure, since the structures of the forged structure of the shell pieces and the welded structure of the weld bead are different, distortion remains in the joint, and the welded joint is formed. The longer the length, the greater the residual strain, and if there is a small welding defect such as a pinhole in the welded joint, a crack will be generated from that part, making it possible to make full use of the excellent repulsion force of the titanium alloy. There were problems such as inability to do so.

[Means for solving the problem]

Therefore, the present inventors have conducted research to produce a metal wood head which is low in manufacturing cost and has few welding defects and residual strains. As a result, a titanium alloy having a small opening and a hollow portion is obtained. Most of the head made by precision casting, then, after fixing the balance weight in the cavity from the above-mentioned opening, it is obtained by sealing with a lid made of titanium alloy obtained by precision forging the above-mentioned opening. Since the length of the weld bead for sealing the small opening is extremely short,
Fewer welding defects and residual strains, and less post-welding treatment for grinding and polishing the above-mentioned weld bead, thus making it possible to significantly reduce the production cost and sufficiently exhibit the repulsive force of the titanium alloy. They have learned that they can produce metal wood.

The present invention has been made based on such knowledge, and is obtained by precision casting of the titanium alloy head having an opening and a cavity, and then precision casting of the opening. The present invention is characterized by a method for manufacturing a golf club head in which the obtained titanium alloy lid is sealed by welding.

〔Example〕

Next, an embodiment of the present invention will be specifically described with reference to the drawings.

FIG. 1 is a cross-sectional view of an alumina precision casting mold 1 produced by a lost wax method. Inside the alumina precision casting mold 1, a hollow 2 in the shape of a metal wood head is formed. In this hollow 2, Ti-6% Al-
Most of the metal wood head is manufactured by injecting and solidifying a molten titanium alloy having a composition of 4% V (or more by weight).

FIG. 2 is a side view of most of the casting 01 of the head produced by injecting the molten titanium alloy into the hollow 2 of the precision casting mold 1, and this casting 01 is composed of the face 3 and the upper surface 4 of the head.
It has a shaft 5, an opening 6, and a cavity 7.

On the other hand, a sole lid 9 corresponding to the shape and size of the opening 6 is separately manufactured by forging, and a balance weight 14 is attached to one surface of the sole lid 9.
And the sole lid 9 was combined with each other and integrated by welding, and the opening 6 was sealed.

In the casting 01 shown in FIG. 2, the opening 6 is provided on the entire surface of the sole. However, as shown in FIG. 4, a part 10 of the sole is also integrally formed by precision casting to make the opening 6 as small as possible. However, it is possible to make the length of the welded portion as short as possible.

The casting 01 or 02 shown in FIG. 2 or FIG. 4 was prepared, and after welding the sole lid 9, the outer surface of the weld bead 8 was ground and then polished to finish the metal wood head.

〔The invention's effect〕

According to the golf club head manufacturing method of the present invention,
Since most of titanium alloy heads are manufactured by precision casting, (a) the dimensional accuracy in the completed shape can be made higher than that of a golf club head manufactured by laminating conventional casting plates, and The repulsion inherent in the titanium alloy can be sufficiently exhibited.

(B) The length of the weld bead is shortened because the opening to be sealed by welding can be reduced, so that the weight error, residual distortion, and weld defects due to the weld bead can be reduced, and furthermore, labor is reduced. Such post-welding treatment can be greatly reduced.

(C) Since the sole lid is formed by forging, the forged structures are aligned in one direction, the wear resistance of the sole lid is improved, and the life of the golf club head is improved.

And so on.

[Brief description of the drawings]

1 is a sectional view of a precision casting mold, FIG. 2 is a side view of a casting obtained by precision casting using the precision casting mold of FIG. 1, and FIG. 3 is an opening of the casting. Side view of a golf club head produced by welding a sole lid to a portion, FIG. 4 is a side view of another embodiment of a casting obtained by precision casting, FIG. 5 is a conventional titanium alloy head Illustration showing the method of manufacturing, 1: precision casting mold, 2: hollow, 3: face, 4: top, 5: shaft, 6: opening, 7: cavity, 8: weld bead, 9: sole Lid, 10: sole surface, 14: balance weight, 01 , 02 : casting.

Claims (2)

(57) [Claims] 1. A titanium alloy golf club head having an opening communicating with a cavity formed on a sole surface of a titanium alloy golf club head is manufactured by precision casting, and a titanium alloy source lid corresponding to the opening is precision forged. A method for manufacturing a golf club head, wherein the opening is welded and sealed with the titanium alloy sole lid. 2. A method for manufacturing a golf club head according to claim 1, wherein a balance weight is attached before said opening is sealed.