JP3072642B2 - Manufacturing method of iron type golf club head - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for manufacturing an iron golf club head having a back cavity.

[0002]

Golf clubs consist of a shaft and a club head and are generally classified into three types: wood, iron, and putter. Irons are categorized by loft angle (loft angle). Irons having a small loft angle (for example, 20 to 30 degrees) are called long irons, and irons having a large loft angle (for example, 40 to 50 degrees).
Irons are called short irons. Normally, irons are numbered from long irons to short irons, for example, first, second to eighth, ninth,
PW (Pitching wedge), SW (Sand wedge)
And LW (LOB WEDGE).

[0003] The iron club head has a front face for hitting a golf ball and a rear back face. The bag may have a cavity or a smooth surface.
Each face has an area called a sweet spot. The sweet spot is the area on the face that gives the best results when hitting a golf ball. An iron having a cavity in the back, that is, an iron having a cavity back has a sweet spot larger than an iron having a smooth back surface, that is, an iron having a solid back. It has been proposed to arrange the center of gravity as rearward as possible and change the size and position of the cavity provided in the bag in order to enlarge the sweet spot.

For example, as shown in FIG.
FIG. 1 of JP-A No. 22 discloses an iron having a cavity back. In this publication, the thickness of the lower surface 1A of the cavity 1 and the sole 2 is made larger on the front side than on the rear side as the short iron becomes. In this conventional publication, the lower surface 1A of the cavity 1 and the face 2 are formed by using a cutting tool such as a cutting tool.
The angle A with respect to the back surface is about 65 degrees. In addition, 3 in a figure is a grain flow line.

However, there is a problem in that forming the cavity 1 by cutting requires a large amount of processing.

Japanese Patent Application Laid-Open No. 8-276040 discloses a manufacturing method in which a cavity is formed in an undercut shape by forging. In this case, there is a problem that an undercut at a deeper angle than the angle of the sole, that is, the angle between the sole and the face, cannot be formed in the cavity. In addition, there is a limit to enlarging the sweet spot by positioning the center of gravity rearward, because a sharp undercut cannot be formed in the cavity.

In view of the above, the present invention has been made to solve the above-mentioned problems, and in an iron-type golf club head having an undercut-shaped cavity, the sweet spot is enlarged by positioning the center of gravity rearward, and the iron is easy to manufacture. It is an object of the present invention to provide a method of manufacturing a golf club head.

[0008]

According to a first aspect of the present invention, there is provided a method of manufacturing an iron type golf club head having a face at a front portion and a cavity at a back portion.
After forming the face in the front part, forming the sole in the lower part, and forming the head body with the cavity in the back by forging, the cavity is further processed by cutting having a rotation axis, so that the angle between the face and the sole is formed. A method for manufacturing an iron-type golf club head, wherein a deeper cavity is formed.

Therefore, by forming a deep cavity, the center of gravity can be arranged rearward, and the amount of machining by cutting can be reduced.

According to a second aspect of the present invention, there is provided an iron-type golf club according to the first aspect, wherein an included angle between the lower surface of the deep cavity and the face is less than 83 degrees. This is a method for manufacturing a head.

Therefore, the center of gravity can be arranged further rearward, and the sweet spot can be enlarged.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. As shown in FIGS. 1, 3, and 4, the iron-type golf club head 11 is made of metal such as steel (iron) or titanium, and has a face 13 having a lateral groove 12 called a score line or the like formed at the front. A cavity 14 is formed on the back, a hosel 16 for connecting the shaft 15 is formed on one side, and a sole 17 is further formed on the lower side.
The angle B between the lower surface 18 of the cavity 14 and the face 13 is less than 83 degrees, and in the embodiment, it is approximately 70 degrees so that the cavity 14 has an undercut shape. Next, a manufacturing method will be described. As shown in FIGS. 2 and 5, the metal material 19 is formed by upper and lower dies 20, 21 as forging devices. The forging process at this time is cold or hot forging, and a cavity 14A that is not undercut is formed in the back by the upper mold 20, and the face 13, hosel 16, sole
The head body 22 on which the 17 is formed is formed. The molding process of the head main body 22 is performed by one or more forging processes.

Next, the cavity 14A of the head body 22 is provided with an end mill (not shown) as a cutting means, that is, a cutting tool having a rotating shaft having a cutting edge at an end and a spiral cutting edge at an outer surface. The undercut-shaped cavity 14 is formed by being further deeply removed by a cutting device.

A lateral groove 12 is formed in the face 13 of the head body 22 having the cavity 14 formed in this way, and a hole 16A into which the lower end of the shaft 15 is inserted is formed in the hosel 16. Thereafter, the head 11 is formed by polishing the surface, or performing plating or buffing.

As described above, in the above embodiment, the cavity 14A which is not undercut in the back by forging.
By cutting the cavity 14A further deeply with an end mill or the like, the head body 22 formed with the above can form the cavity 14 with a reduced amount of machining by cutting, and the surface of the cavity 14 can be finished smoothly,
Aesthetics can be improved.

Further, since the cavity 14A is formed by cutting the cavity 14, the angle C of the sole 17 which cannot be formed by forging, that is, the face 13 and the sole
The cavity 14 has an undercut shape at an angle (B> C) deeper than the included angle C of 17 or a sharp undercut shape.
Can be formed. For this reason, the center of gravity G of the head 11 can be set freely.

Further, the position of the center of gravity G is disposed rearward by forming the included angle B between the lower surface 18 of the deep cavity 14 and the face 13 in an undercut state of less than 83 degrees, so that the center of gravity L, That is, by increasing the distance between the face 13 and the center of gravity G, the sweet spot can be expanded.

The present invention is not limited to the above embodiment, and various modifications are possible, for example, the head body may be formed by forging two or more kinds of metal materials. .

[0019]

According to the present invention, there is provided a method of manufacturing an iron type golf club head having a face at a front portion and a cavity at a back, wherein a face is formed at a front portion, a sole is formed at a lower portion, and a cavity is formed at a back portion. A head body formed with forging is formed by forging, and then the cavity is further processed by cutting having a rotation axis to form a cavity deeper than the included angle between the face and the sole. Since the center of gravity of the head can be arranged rearward and the cavity can be formed with a small amount of cutting, the production is easy and the appearance of the cavity surface can be improved.

The method of manufacturing an iron-type golf club head according to claim 1, wherein the angle between the lower surface of the deep cavity and the face is formed in an undercut state of less than 83 degrees. Therefore, the center of gravity can be arranged further rearward, and the sweet spot can be enlarged.

[Brief description of the drawings]

FIG. 1 is a sectional view of a head showing an embodiment of the present invention.

FIG. 2 is a sectional view of a head after forging, showing an example of the present invention.

FIG. 3 is a front perspective view of a head showing an embodiment of the present invention.

FIG. 4 is a perspective view of a rear side of a head showing an embodiment of the present invention.

FIG. 5 is a cross-sectional view at the time of forging showing an example of the present invention.

FIG. 6 is a sectional view of a conventional example.

[Explanation of symbols]

 11 Head 13 Face 14 Cavity 14A Cavity 17 Sole 18 Lower surface 22 Head body B Included angle

Claims (2)

(57) [Claims] 1. A method for manufacturing an iron-type golf club head having a face at a front portion and a cavity at a back, wherein a face is formed at a front portion, a sole is formed at a lower portion, and a cavity is formed at a back portion. A method of manufacturing a head for an iron-type golf club, wherein a cavity deeper than an included angle between a face and a sole is formed by further processing the cavity by cutting having a rotation axis after manufacturing the main body by forging. 2. The method for manufacturing an iron-type golf club head according to claim 1, wherein an angle between the lower surface of the deep cavity and the face is formed in an undercut state of less than 83 degrees.