JPH0631421A - Production of golf club head - Google Patents

Abstract

(57) [Summary] [Purpose] The weight can be reduced by having a good inner surface casting surface and by making the wall thickness thin. [Structure] A head includes a face-side head portion 1 and a rear-face-side head portion 6 each having a reinforcing material preform on the face portion.
Each is divided into and cast using a movable metal core. Next, the face side head portion 1 and the rear surface side head portion 6 are integrally joined to each other by welding.

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, and more particularly, to use a face surface as a composite material of a preformed body and a metal, to have a good inner surface casting surface and to reduce the wall thickness. The present invention relates to a method for manufacturing a golf club head, which is capable of ensuring strength and elasticity of a face surface and reducing weight.

[0002]

2. Description of the Related Art Conventionally, a high pressure solidification method (squeeze casting method) has been used as a method for producing a metal matrix composite material. In this method, a preformed body made of a reinforcing material such as a ceramic whisker is placed in the cavity of a casting mold in advance, and then a molten base metal is press-fitted to impregnate the preformed body for casting. It is a thing. The metal matrix composite material obtained by this method has mechanical properties such as high strength and excellent abrasion resistance.

Regarding the high-pressure casting method for producing the metal matrix composite material, JP-A-3-146252, JP-A-3-146253, and JP-A-3-4623 are available.
Prior art is disclosed in 54 etc. Japanese Patent Laid-Open No. 3-146252
It is disclosed that the press-fitting speed is adjusted in order to prevent the deformation and breakage of the preformed body when the molten metal is press-fitted, and JP-A-3-14
6253 discloses a method for arranging a preformed body for preventing the occurrence of porosity, and JP-A-3-146254 discloses a method for manufacturing a thin-walled composite material such as a plate or a cylinder. There is.

[0004]

However, these prior arts do not give a concrete method for manufacturing the golf club head which is the object of the present application. That is, the above-mentioned prior art relates to a method for producing an article having a general shape, and by any method for a special shape such as a golf club head (a shape that is hollow and thin and has almost no opening). It does not disclose how to cast it. In casting such a shape, a collapsible core such as sand is generally used for casting.

However, when a collapsible core is used, the casting surface of the inner surface of the club is poor, and the wall thickness dimensional accuracy of the product is poor. If a metal core is used as the core, the problem of the casting surface on the inner surface of the club can be solved, but it is difficult to reduce the thickness of the corner (notch) inside the club head.

Accordingly, an object of the present invention is to provide a method for manufacturing a golf club head which has a good inner surface casting surface and which can be made lighter by reducing the wall thickness.

[0007]

According to the present invention, a casting die is divided into a first die on the face side and a second die on the rear surface side, and a face portion in the first die is divided into two parts. A preformed body for a reinforcing material is placed, movable metal cores are respectively placed in the first mold and the second mold, and the first mold and the second mold are combined. Molten metal is cast under high pressure between the core and the molten metal is solidified, the core is taken out of the mold, the face side head portion and the rear surface side head portion are cast, and thus cast The face side head portion and the rear surface side head portion are integrally joined to each other by welding.

Next, an embodiment of a method for manufacturing a golf club head according to the present invention will be described with reference to the drawings.

FIG. 1 is a schematic front view showing a casting state of a face side head portion according to an embodiment of a method for manufacturing a golf club head of the present invention. FIG. 2 is a sectional view taken along the line AA of FIG. 3 is a schematic front view showing a casting state of a rear head portion according to an embodiment of a method for manufacturing a golf club head of the present invention, FIG. 4 is a sectional view taken along line BB in FIG.
FIG. 6 is a plan view of a head manufactured by an embodiment of a method for manufacturing a golf club head according to the present invention. FIG. 6 is a bottom view of a head manufactured by an embodiment of a method for manufacturing a golf club head according to the present invention. FIG. 7 and FIG. 7 are C of FIG.
It is a -C line sectional view.

The golf club head manufacturing method of the present invention is characterized in that the head is divided into two parts, that is, the head portion on the face side and the head portion on the rear surface side, and a movable metal member is used as the core. Is.

As shown in FIGS. 1 and 2, the face side head portion 1 is cast as follows. That is, the preformed body 3 made of a reinforcing material such as a ceramic whisker is placed in advance on the face portion in the first die 2 for the face side head portion 1 and is vertically slidable in the first die 2. Put the metal core 4 for the face side head part,
Molten metal such as aluminum, aluminum alloy, magnesium or magnesium alloy is cast under high pressure between the mold 2 and the core 4 under high pressure to solidify the molten metal, and then the core 4 is moved to the first mold. The face side head portion 1 is cast out by pulling out upward from inside 2.

On the other hand, as shown in FIGS. 3 and 4, the rear head portion 6 is cast as follows. That is,
A metal core 8 for the rear head part, which is slidable in the vertical direction, is placed in the second metal mold 7 for the rear head part, and between the second metal mold 7 and the core 8, the face side head part 1 and Molten metal of the same material is cast from the sprue stamp 9 under high pressure, and after the molten metal is solidified, the core 8 is pulled out from the inside of the second mold 7 to cast the rear head portion 6.

In this way, the face side head portion 1
After the rear head portion 6 is cast, as shown in FIGS. 5 and 6, the face head portion 1 and the rear head portion 6 are integrally joined to each other by TIG welding, laser welding or the like. As a result, the hollow metal golf club head of the present invention is manufactured.

[0014]

As described above, according to the present invention, the use of the movable metal core provides a smooth casting surface, and high wall thickness dimensional accuracy can be obtained. Therefore, the weight can be easily reduced. It is possible to bring about useful effects.

[Brief description of drawings]

FIG. 1 is a schematic front view showing a cast state of a face side head portion according to an embodiment of a method for manufacturing a golf club head of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a schematic front view showing a cast state of the rear head portion according to the embodiment of the method for manufacturing the golf club head of the present invention.

4 is a sectional view taken along line BB of FIG.

FIG. 5 is a plan view of a head manufactured by an embodiment of a method for manufacturing a golf club head according to the present invention.

FIG. 6 is a bottom view of the head manufactured by the embodiment of the method for manufacturing the golf club head according to the present invention.

7 is a cross-sectional view taken along line CC of FIG.

[Explanation of symbols]

 1: Face-side head portion, 2: First mold, 3: Preformed body, 4: Core, 5: Gate stamp, 6: Rear surface side head portion, 7: Second mold, 8: Core, 9 : Yukata stamp.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Reference number within the agency FI technical display location B22D 25/02 Z 8926-4E B23K 26/00 310 N 7425-4E (72) Inventor Hino Zendo Marunouchi 1-2-2 Marunouchi, Chiyoda-ku Nihon Kokan Co., Ltd. (72) Masao Nagai 3-6-29 Washusu, Fukushima-ku, Osaka Mizuno Co., Ltd. (72) Masakatsu Shirai Mishima, Shizuoka Prefecture 64 Aku, Tousei Co., Ltd.

Claims (1)

[Claims] 1. A preforming body for reinforcing material is divided into a first mold on a face side and a second mold on a rear surface side, and a face part in the first mold is divided into two parts. Place the first
A movable metal core is placed in each of the mold and the second mold, and molten metal is separately cast between the core and the first mold and the second mold under high pressure. After the molten metal has solidified, the core is moved out of the mold and taken out to cast a face side head portion and a rear surface side head portion, and the face side head portion and the rear surface side head portion thus cast And a method of manufacturing a golf club head, wherein the elements are integrally joined to each other by welding.