JP3059397B2 - 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 golf club,
The present invention relates to a club head capable of increasing the depth of the center of gravity of the head to widen the sweet area, particularly to a lightweight iron club (including a putter) head.

[0002]

2. Description of the Related Art In order to increase the depth of the center of gravity of the head of a lightweight iron club and to enlarge the sweet area, the head body is made of a titanium alloy, and the specific gravity of the head body made of titanium alloy is higher than that of titanium alloy. It is generally known that a back weight made of a large stainless steel or a copper alloy is fixed by means such as press-fitting, crimping, bonding and casting.

[0003]

However, in the prior art described above, since the back weight is exposed on the surface, the aesthetic appearance of the head is impaired, and there is a risk that the back weight will peel off when the club is used. . Therefore, the present invention solves such a conventional problem, and has an excellent aesthetic feeling.
Another object of the present invention is to provide a safe golf club.

[0004]

SUMMARY OF THE INVENTION A golf club head main body is made of a malleable metal material having a low specific gravity, and has a specific gravity higher than that of the head main body and a melting point higher than a forging temperature of the head main body material. A method of manufacturing a golf club head is characterized in that a composite material made of a material is inserted into a built-in position in the head body, and the head body is formed by forging so that the composite material is sealed in the head body.

[0005]

FIG. 1 shows an embodiment of the present invention.
This will be described with reference to FIGS. 1A and 1B show a preformed product of a club head body 1 according to the present invention. FIG. 1A is a rear view of the head body 1 and FIG. 1B is a side view. As a material of the head main body 1, a titanium alloy of Ti-6Al-4V, pure titanium, 2000-series, and 7000-series aluminum alloy are used.

The head body material (diameter 30)
mm round bar) is forged with a preforming die to produce a preformed product having the shape shown in FIG. The preform has a slightly larger volume (10 to 30%) than the final shape, and has a larger angle R (corner R) and concave R (fillet R) than the final shape. Reference numeral 2 denotes a neck portion, and reference numeral 3 denotes a bulging portion projecting from the sole portion 4 to the toe portion 5 of the head main body and protruding from the back side of the head.

As shown in FIG. 2, a blind hole 6 is machined from the toe side of the club on the sole 4 side of the preformed product in order to incorporate a later-described composite material serving as a back weight into the head body 1 as shown in FIG. Set up. When the position of the composite material is shifted toward the heel side by the iron club count, the depth is adjusted by the hole depth. In the drawings, the holes are perforated from the toe side of the club, but may be perforated from the heel side in some cases.

The composite material 7 is inserted into the blind hole 6 formed in the preform. The composite material has a higher melting point than the forging temperature of the head body material and has a high specific gravity. Is used. As such a material, a W (tungsten) based alloy, a Ni (nickel) based alloy, a Cu (copper) alloy or the like is suitable. The amount of composite material to be inserted is determined by the weight required for the final shape of the head and the shape of the sole. When the composite material 7 is inserted into the blind hole 6, the gap between the hole and the composite material may be small enough to be pushed by hand (0.1 mm).

As described above, the preform in which the composite material 7 is inserted is forged with a mold having a final shape, whereby the head body material is plastically deformed, and the composite material 7 is sealed inside the head. As shown in FIG. A head that does not expose the material 7 is created. If the head body material is pure Ti or a Ti alloy and the composite material is a W-based alloy, the W-based alloy is not deformed at all in the forging temperature range of the Ti material, and only the Ti material is plastically deformed in the mold. Can be present during molding as well as after molding and before molding. Furthermore, since the hole 6 for inserting the composite material can also be closed, an iron head made entirely of Ti alloy is produced in appearance.

When the head has a simple shape,
As shown in FIG. 4, a blind hole 6 for inserting a composite material is previously formed at a predetermined position of a round bar which is a head body material, and a composite material 7 is inserted into the hole 6, and this is inserted into a mold in one or two stages. The head having the final shape may be formed by forging. Needless to say, the head of the present invention can be applied not only to an iron club but also to a putter.

[0011]

According to the head of the present invention, since the composite material serving as the back weight is wrapped in the head body by forging pressure, the aesthetic appearance of the head is not impaired, and the back weight can be peeled off when the club is used. Is safe. Further, since the head is forged, the feel at the time of hitting the ball is good, and a club head having a wide sweet area can be provided.

[Brief description of the drawings]

1A and 1B are explanatory views of a preformed head according to the present invention, wherein FIG. 1A is a rear view and FIG. 1B is a side view.

2A and 2B show a state in which a blind hole for inserting a composite material is perforated in the head of FIG. 1, FIG. 2A is a rear view, and FIG.

FIG. 3 is an explanatory view of a final molded product according to the present invention, in which (a)
The figure is a rear view, and the figure (b) is a side view.

FIG. 4 is a partially cutaway perspective view of an embodiment in which a composite material is inserted in advance into a head body material according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Head main body 2 Neck part 3 Swelling part 4 Sole part 5 Toe part 6 Hole for composite material insertion 7 Composite material

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) A63B 53/04 A63B 53/06

Claims (4)

(57) [Claims] 1. A golf club head capable of expanding a sweet area, wherein the head body is made of a malleable metal material having a low specific gravity, and has a specific gravity greater than that of the head body and a melting point of the material of the head body. Insert a composite made of a material higher than the forging temperature into the built-in position in the head body
The head so that the composite material is sealed in the head body.
A method for manufacturing a golf club head , comprising forging a main body . 2. The method of manufacturing a golf club head according to claim 1, wherein the material of the head body is pure titanium or a titanium alloy, and the material of the composite material is a W-based alloy.
Law. 3. A composite material is inserted into a sole portion of a head body preformed to be larger than a final shape of the head, and only the head body is forged by a mold having a final shape. 3. The method for manufacturing a golf club head according to claim 1 or 2 . 4. The method for manufacturing a golf club head according to claim 1, wherein only a head body material in which a composite material is incorporated in advance is formed by die forging.
Law.