JPH09253250A - Golf club head and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To give a relatively large spin to a golf ball at a shot in a golf club having a face groove in its face surface. SOLUTION: Face grooves 8 are formed in a face surface 3. Small grooves 9, 10 further are formed in the face surface 3. The grooves 9, 10 are formed utilizing cut traces 14, 15 formed when the face surface 3 is formed. Since not only the grooves 8 but also the grooves 9, 10 are formed in the surface 3, a relatively large spin can be given to a golf ball at a shot. And the grooves 9, 10 can be formed utilizing cut traces 14, 15 and hence they can be easily formed.

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 and a method for manufacturing the same.

[0002]

Conventionally, a face groove of a golf club head (hereinafter referred to as a head) has been formed with face grooves substantially parallel to each other along the sole surface at equal intervals. As an improved version of such a face groove, the groove is arranged in a circular shape, an elliptical shape or a polygonal shape with a sweet spot as a center point in FIG. 1 of Japanese Utility Model Laid-Open No. 5-48971 so as to provide an appropriate spin for a golf ball. A golf ball provided with a golf ball so that the flight direction of the golf ball can be corrected.
FIG. 1 of Japanese Patent Laid-Open No. 62-62 discloses a head for correcting hooks and slices by inclining a part of the face groove. Further, in FIG. 1 etc. of Japanese Patent Application Laid-Open No. 7-313639, a head groove is provided radially on the face surface to prevent a water film from being formed between the face surface and the golf ball,
Japanese Unexamined Patent Publication No. 8-777 discloses a head having a large number of concentric polygonal face grooves centered on a sweet spot on the face surface.

Since such a conventional head has a limited number of face grooves formed on a face having a limited area, the number of the face grooves is limited, and a good spin is achieved for a golf ball. There was a problem that I could not give.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a golf club head which can solve the above problems and can give good spin to a golf ball, and a method of manufacturing the same.

[0005]

SUMMARY OF THE INVENTION According to the present invention, in a golf club head in which face grooves are formed on a face surface along the sole substantially in parallel and at equal intervals, a small groove having a cross section smaller than the face groove is formed from the face groove. The golf club head is characterized by being formed in a large number, and since not only the face groove but also the small groove contacts the golf ball at the time of shot, good spin can be given.

The present invention also provides a method for manufacturing a golf club head, wherein the face surface of the head body is cut by a cutting tool, and then the face surface is polished by a buff to finish the surface flat. Is a method for manufacturing a golf club head, characterized by polishing while leaving a cutting trace by the cutting tool, and using a cutting trace by the cutting tool to spin a golf ball at the time of a shot. Small grooves can be formed to give.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 and 2, irons,
Iron-type golf clubs such as PW (pitching wedge), SW (sand wedge), and LW (lob wedge) include a head 1 and a shaft 2. The head 1 has a face surface 3 on a front surface, a concave portion 4 called a cavity on a rear surface, a sole 5 on a lower portion, a heel 6 on a lower portion on a negative side, and a hosel 7 for connecting the shaft 2 to an upper portion on a negative side. Further, a face groove 8 called a score line or the like is formed on the face surface 3. The face grooves 8 are formed along the sole 5 substantially in parallel and at equal intervals. The face groove 8 has a width A of 0.6 to 0.9 mm and a depth B of 0.3 to
0.5 mm, the length C between the centers is 2.5 to 4.5 mm
Is formed. In the figure, 11 is a plated layer treated on the surface of the head 1, and 12 is a rough surface of the plated layer 10 formed on the inside of the face surface 3 indicated by a dot-dash line so that the plated layer 11 has no gloss. The surface.

Next, the manufacturing method will be described. FIG. 3 shows the first step, in which the surface of the head body 1A formed by forging or casting has a sharp cutting tool 13 such as an end mill.
The surface is cut flat by cutting in one direction (arrow X). At this time, a unidirectional cutting trace 14 is formed. FIG. 4 shows the second step, in which the surface of the head body 1A is cut flat in one direction (arrow Y) by a cutting tool 13 such as an end mill. At this time, a cutting trace 15 in the other direction is formed. FIG. 5 shows the third step, in which the face groove 8 is formed by a cutting tool 16 such as an end mill having a small diameter. Next, as shown in the fourth step of FIG. 6, the surface of the head body 1A is polished with the buff 17 to finish the surface. During this polishing process, an abrasive (not shown) is attached to the buff 17, and the buff 17 is rotated by a motor (not shown) for polishing. Incidentally, an abrasive material (not shown) may be provided on the face surface 3 and polished by the buff 17. During this polishing process, the cutting marks 14, 15
To leave the small grooves 9 and 10. Then, as shown in the fifth step of FIG. 7, the surface is plated to form a plating layer 10, and then sandblasting is performed to shot sand 18 in the center of the face surface 3 to form a rough surface 12 and the head is formed. Produce 1. The buff 17 may be a cloth buff, a brush buff, a wire buff, a felt buff, or a PVA grindstone in which an abrasive is directly contained in the buff.

As described above, in the above-described embodiment, the small grooves 9 and 10 each having a smaller cross section than the face groove 8 are formed on the face surface 3 in a larger number than the face groove 8, so that a golf ball (not shown) can be used when shot. Not only the face groove 8 but also a large number of small grooves 9 and 10 come into contact with), so that a relatively large spin is given to the golf ball and the flight distance of the golf ball can be extended. Further, by forming a plurality of the small grooves 9 and 10 between the face grooves 8 as shown in FIG. 2, it is possible to surely give a relatively large spin to the golf ball.

Further, the large number of small grooves 9 and 10 are provided in the cutting tool 13.
Said cutting marks when cutting by, and polishing the surface 1
Since the small grooves 9 and 10 are formed by leaving 4 and 15 remaining, the small grooves 9 and 10 can be easily formed.

Moreover, the cutting traces 14 and 15 intersect with each other by cutting the cutting traces 14 and 15 from both directions (arrows X and Y) by the cutting tool 13, so that as shown in FIG. Small grooves 9 and 10 are densely formed on both the left and right sides, and small grooves 9 and 10 are roughly formed at the center of the face surface 3. As a result, when the golf ball comes off the sweet spot at the time of a shot, an appropriate spin is given to the golf ball and the flight direction can be corrected.

It should be noted that the present invention is not limited to the above-mentioned embodiment, and for example, an iron-type golf club has been described in the embodiment, but in a so-called metal wood club formed by integrally joining a plurality of metal shells. Various modifications can be made to the face, such as the manufacturing method described above may be used.

[0013]

According to the present invention, in a golf club head in which face grooves are formed on the face surface substantially in parallel and at equal intervals along the sole, a large number of small grooves having a smaller cross section than the face grooves are formed. The golf club head is characterized by being capable of imparting spin to the golf ball not only by the face groove but also by the small groove at the time of shot.

The present invention also provides a method for manufacturing a golf club head in which the face surface of the head body is cut by a cutting tool, and then the face surface is polished by a buff to obtain a flat surface. The method for manufacturing a golf club head is characterized by polishing while leaving a cutting trace by the cutting tool when finished into a flat shape by simply using a cutting trace to form a small groove formed on the face surface. Can be formed.

[Brief description of drawings]

FIG. 1 is a front view showing one embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing one embodiment of the present invention.

FIG. 3 is a partially cutaway perspective view showing a first step of the embodiment of the present invention.

FIG. 4 is a partially cutaway perspective view showing a second step of the embodiment of the present invention.

FIG. 5 is a partially cutaway perspective view showing a third step of the embodiment of the present invention.

FIG. 6 is a partially cutaway perspective view showing a fourth step of the embodiment of the present invention.

FIG. 7 is a partially cutaway perspective view showing a fifth step of the embodiment of the present invention.

[Explanation of symbols]

 1A Head body 3 Face surface 8 Face groove 9 10 Small groove 13 Cutting tool 14 15 Cutting mark 17 Buff

Claims (2)

[Claims] 1. A golf club head in which face grooves are formed on a face surface substantially in parallel and at equal intervals along a sole, and a large number of small grooves having a smaller cross section than the face grooves are formed than the face grooves. Golf club head. 2. A method of manufacturing a golf club head, wherein a face surface of a head body is cut by a cutting tool, and then the face surface is polished by a buff to obtain a flat surface. A method for manufacturing a golf club head, which comprises polishing while leaving a cutting mark by the cutting tool when finished into a shape.