JPH11151330A - Golf club head - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance a ball hitting feel and the sound produced by the hitting of a ball. SOLUTION: A head 1 made from a metal base such as titanium, a titanium allay, iron, an iron alloy, or stainless is manufactured using a metal powder injection molding means. The surface density of the surface layer 21 of the ball-striking part 2 of the head 1 at the side of a face 2a is as solid as 90% or more and less than 100%, and the inner density of the inner layer 22 of the ball striking part 2 at the side of a back 2b is as coarse as not less than 70% and not more than 95%.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a golf club head manufactured by means of metal powder injection molding, and more particularly to a method of hitting a ball by modifying the internal structure of a head hitting portion made of a desired metal base material. It is designed to enhance the feeling and hitting sound.

[0002]

2. Description of the Related Art Conventionally, in a golf club head of this kind, for example, an iron club head, titanium (T
i) Alternatively, using a desired metal base material such as a titanium alloy,
Some have a configuration formed by casting or forging.

[0003]

However, in such an iron club having a conventional structure, since the head is formed by casting or forging, only a material density of 100% can be obtained. Inferior in shot feeling and hitting sound, and due to restrictions on molds and manufacturing methods, the degree of freedom in head shape and thickness is low, and grinding and polishing for adjusting dimensional accuracy and weight accuracy. Since post-processing is required, the production cost is high and the quality is not stabilized.

An object of the present invention is to provide a golf club head capable of enhancing the feel at impact and the sound of a hit ball.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention aims to increase the surface density of the face-side surface layer of a head hitting portion made of a desired metal base material, In this case, the surface density of the surface layer on the face side of the head hitting portion is 90%.
To less than 100% and the internal density of the back surface side inner layer is 80% or more and 95% or less, preferably 80% or less.
More than 90%.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. As shown in FIG. 1, reference numeral 1 denotes a golf club head, for example, an iron club head according to the present invention. .

In the head 1, a hitting portion 2 and a hosel portion 3 are integrally formed of a metal base material such as titanium or a titanium alloy, and as shown in FIG. The back surface 2b has a cavity shape formed by the concave portion 4 and the sole surface 2c has a relatively wide and thick bulge. It has a form.

The hitting portion 2 of the head 1 is formed densely so that the surface density of the surface layer 21 on the face surface 2a side is 90% or more and less than 100%, while the back surface 2b is formed. 80% internal density of the side internal layer 22
It has a form in which it is formed roughly so as to be 95% or less, preferably 80% or more and 90% or less.

The head 1 is manufactured by a metal powder injection molding method. The metal powder injection molding method is, for example, a method in which a fine metal powder material of about 1 to 600 μm, preferably about 1 to 100 μm is added to water wax. The kneaded material, to which a binder such as resin is added and kneaded, is granulated by a granulator and pelletized, and the pelletized molding material is supplied to an injection molding machine and fluidized to obtain a desired molded product. By injecting and filling into a cavity of a molding die having an outer shape, a head green body of a desired product shape is formed,
The head green body is subjected to a heat treatment to remove the binder, and the head brown body after the removal of the binder is sintered to form a molded product.

In this case, the head green body refers to a form in which the metal powder, binder, and moisture after injection molding are easily deformed and are in an unstable state, and the head brown body refers to the head green body. A form in which the body is heated and dried to remove water and is in a shape stable state.

In this way, the density of the head hitting portion 2 can be set and adjusted particularly in the range of 90% to less than 100% in order to easily control the material density at the time of head molding.

In the above-described embodiment, titanium (Ti) or a titanium alloy has been described as an example of the metal base material forming the head 1. However, iron (Fe), an iron alloy, stainless steel (SUS), or the like may be used. It is preferably used.

Although the golf club has been described using an iron club as an example, the present invention can be applied to a wood club, a putter club, and the like.

[0014]

As is apparent from the above description, according to the present invention, the surface density on the face side of the head hitting portion made of a desired metal base material is formed densely, and the internal density on the back side is reduced. Since it has a porous structure formed at the time of hitting, at the time of hitting the ball, the elastic wave generated at the hitting portion is scattered and attenuated by the extremely small bubbles and attenuated, so that the hitting feeling is soft,
High clear sounding hitting sound can be obtained.

Further, since the head is manufactured by the metal powder injection molding means, the molding process can be simplified, so that the manufacturing cost can be reduced, and the head shape and thickness can be reduced. The degree of freedom can be increased, the dimensional accuracy and the weight accuracy can be improved without the need for conventional post-processing such as grinding and polishing, and the quality can be kept stable.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an iron club head as an embodiment manufactured by a method of manufacturing a golf club head according to the present invention.

FIG. 2 is an enlarged sectional view showing a part of the head hitting portion.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Head, 2 ... Hitting part, 2a ... Face surface, 2b ... Back surface, 2c ... Sole surface, 21 ... Surface layer, 22 ... Inner layer.

Claims (2)

[Claims] The present invention is characterized in that the head striking portion made of a desired metal base material has a porous structure in which the surface density of the face side surface layer is dense and the internal density of the back surface side inner layer is coarse. Golf club head. 2. The surface density of the surface layer on the face side of the head hitting portion is set to 90% or more and less than 100%, and the internal density of the inner layer on the back surface side is set to 80% or more and 95% or less. The golf club head according to claim 1, wherein