JPH10179825A - Iron golf club head and iron golf club set - Google Patents

Abstract

PROBLEM TO BE SOLVED: To give less scratches to a ball and restrain reduction in the amount of spin by forming an uneven surface on a metal-made impact surface of a head by a method of jetting minute matal balls with a particle dia. of a specified range to the impact surface. SOLUTION: This head has a hosel 2 to which a shaft is fitted and a metal- made impact surface 3. An uneven surface 4 is formed on the impact surface 3 by jetting minute metal balls to the surface 3. A plurality of score lines 5 are formed on the surface 3. Only a part where the uneven surface 4 is formed is made of metal, while the other parts can be made of other materials. As the jetted balls, those made of steel and its alloy, stainless steel, nickel and its alloy, and cobalt and its alloy are preferably used. The dia. of the balls contains those of 0.3 to 1mm. Accordingly, the purose is attained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an iron golf club head and an iron golf club set used for golf play.

[0002]

2. Description of the Related Art As shown in a front view in FIG. 8, an iron golf club head has a metal ball striking surface 101 for hitting a ball of a head body 100.
01 has a groove called a score line 102 for the purpose of giving a spin to the hit ball in order to suppress the rolling from the landing point in order to suppress the rolling of the hit ball in a parabola.
A large number are engraved at predetermined intervals substantially in parallel with the longitudinal direction of No. 03.

There are rules for the score line 102 on the ball striking face 101 of the club head, that is, the groove, by the Japan Golf Equipment Association. The width and depth of the groove are 0.9 mm and 0.5 mm at the maximum, and The arrangement interval of the grooves is set to be at least three times the groove width and 1.9 mm.

In order to form such a groove (score line 102) on the striking face 101, cutting or press working is performed, and then, depending on the material used for the head, plating for rust prevention is performed, and then the striking ball is hit. Blast processing has been performed on the entire surface 101. The blast processing is performed for the same purpose as the groove processing, and usually has a particle size of 50 to 200 μm.
m of silica sand is sprayed onto the striking face 101 to form fine glass-like irregularities.

[0005]

FIG. 9 is an enlarged sectional view showing a section of the groove (score line 102).
The portion where the groove wall 102A and the striking face 101 intersect forms a considerably sharp corner 102B. FIG. 9 shows a groove having a V-shaped cross section. In the case of a groove having a U-shaped cross section, a sharper angle 102B at which the hitting face 101 and the groove wall 102A are perpendicular to each other is formed. On the other hand, the club head has a loft angle in the range of about 22 ° to 58 ° from a long iron (3 iron) to a short iron (sand wedge), and the striking face 101 is inclined. When the ball is hit, a ball hitting surface 10
Abrasion due to a corner 102B between the groove wall 102A and the groove wall 102A easily occurs. Even if there is a scratch on the ball surface, if you are a beginner, you often lose the ball because the hit ball deviates from the target during play, so you do not have to worry about some abrasions, but advanced In addition, professional golfers are worried about such scratches, and in particular, in the case of professional golfers, they usually use a new ball every three holes.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an iron golf club head and an iron golf club set which are less likely to scratch the ball and suppress a decrease in the spin rate.

[0007]

In order to achieve the above-mentioned object, an iron golf club head according to the present invention is characterized in that the metal ball striking surface of the head main body has a small diameter of 0.3 to 1 mm. It has an uneven rough surface formed by spraying metal spheres. The iron golf club set is a set of a plurality of iron golf clubs having such a head.

[0008]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

In the embodiment shown in FIG. 1, a head body 1 having a hosel 2 to which a shaft (not shown) is attached and a metal hitting surface 3 is shown. An uneven rough surface 4 is formed. In this embodiment, a plurality of score lines 5 similar to the conventional one are provided in addition to the rough surface 4. Only the portion where the rough surface 4 is formed may be made of metal, and the other portion may be formed of another material. In this embodiment, the entire head main body 1 is formed of metal. Reference numeral 6 indicates a sole, reference numeral 7 indicates a toe,
Reference numeral 8 indicates a heel.

As the metal material forming at least the ball striking face 3, iron, stainless steel, copper and its alloys, titanium and its alloys, and the like can be suitably used. The cross-sectional shape of the score line 5 may be V-shaped or U-shaped. As the metal sphere to be sprayed, iron and its alloys, stainless steel, nickel and its alloys, cobalt and its alloys, and the like can be suitably used. The diameter of the metal sphere includes about 0.3 to 1 mm. That is, it is preferable to use metal spheres having a uniform diameter in the range of 0.3 to 1 mm, but metal spheres having a particle size slightly smaller or larger than these may be mixed. Compressed gas such as air pressure is used for injection of the metal sphere. A well-known injection device can be used as the injection device. As an example of the atmospheric pressure, 2.0 to 5
kg / cm ² is preferred. In addition, the plating treatment is usually performed on the head main body 1, but the injection treatment with the metal ball is
Regardless of before and after plating. If the air pressure is 2.0 kg / cm ² or less, the injection is weak, and the roundness cannot be made efficiently,
If it is more than 5.0 kg / cm ² , the injection is too strong and the score line depth may be shallow. In the case where the head surface is made of soft iron and the face surface is hard, for example, the face surface is plated, the above air pressure is set to 3 to 5 kg / cm ^2.
When the face is made of a soft material such as not plated with soft iron, the pressure is preferably set to ² to 3 kg / cm ² .

In the embodiment shown in FIG. 2, a metal hitting surface 3 is formed smoothly, and a roughened surface 4 is formed on the smooth hitting surface 3 by spraying a metal ball. That is, the score line 5 is not engraved in this embodiment. In the hitting surface 3 where the score line 5 is not engraved or in the above-described embodiment, the roughened rough surface 4 is not formed near the heel 8 or the toe 7, but the roughened rough surface 4 is formed on the entire surface. No problem.

FIG. 3 shows a sand wedge head made of soft iron (S25C) plated with nickel chrome and having a roughened surface 4 formed on the hitting surface 3 thereof. The portion of the corner 5B where the surface 3 intersects forms a round shape by the injection of the metal sphere. The score line 5 and the hitting surface 3 as shown in FIG.
A stainless steel ball having a diameter of ² mm was injected at an injection air pressure of 4 kg / cm ² , and the injection time was 10 seconds. On the other hand, a silica sand having a diameter of 100 μm was sprayed onto the hitting surface 3 of the same sand wedge at a blowing air pressure of 4 kg / cm ² and the spraying time was set to 10 seconds, and the shape was as shown in FIG. The hitting surface 3 of the sand wedge of FIG. 3 according to the present invention has a roughened surface 4 on the hitting surface 3 as compared with the hitting surface 101 of the sand wedge shown in FIG. It can be seen that the portion of the corner 5B is crushed to form a rounded shape.

FIG. 4 is a graph showing the relationship between the particle diameter of a metal sphere injected to the hitting surface 3 of a soft iron sand wedge and the backspin of the hitting ball, and the result of an actual hitting test performed using a swing robot. It is shown. The injection conditions were the same for each particle size. The head speed of the swing robot was set to 30 m / s, and in the graph of FIG.
Is a sand wedge obtained by treating the hitting surface under the conditions described above with reference to FIGS. In addition, a graph indicated by reference numeral A indicates a result when a two-piece high spin type solid ball is used, and a graph indicated by reference numeral B indicates a result obtained using a three-piece solid ball.

As is apparent from the graph of FIG. 4, when the roughened surface 4 is formed on the hitting surface 3 provided with the score line 5, when the metal ball having a particle diameter of less than 0.3 mm is jetted, the spin The increase in the effect is extremely small, and in the case of spraying a metal ball having a particle diameter of 0.3 mm or more, the spin effect appears regardless of the type of the ball. Further, it was also found that when the particle diameter of the metal sphere to be sprayed exceeds 0.5 mm, the ball is more likely to be round with a corner of 5B, and the ball is less likely to be scratched. Also,
In FIG. 4, in the high spin type ball indicated by the symbol A, a phenomenon in which the spin effect decreases when the particle diameter becomes 1.0 mm is observed. From this fact, it is considered that when the particle diameter of the metal sphere exceeds 1.0 mm, the groove itself of the score line changes to a substantially narrow and shallow shape by the injection of the metal sphere.

The graphs shown in FIGS. 5 and 6 are obtained by applying the embodiment shown in FIG. 2 to the hitting surface 3 of the sand wedge. FIG.
FIG. 6 shows the measured launch angle. The conditions of FIG. 4 were applied except that a two-piece high spin type solid ball was used as the ball to be used. FIG.
6 and FIG. 6 show the conventional type described above with reference to FIG. 8 and FIG. 9, and shot blasting is to inject silica sand into the smooth type hitting surface 3 under the above conditions, It shows what was processed in the shape.

From the graph shown in FIG. 5, when the particle diameter of the metal sphere is in the range of 0.3 to 1 mm, there is no inferiority between the hitting surface 3 having the score line 5 and the degree of the backspin. Is supported by the launch angle values shown in FIG. That is, since the launch angle tends to increase as the back spin decreases, it can be seen from FIG. 6 that the back spin does not decrease. Also, no scratches were found on the hit ball except for the score line.

FIG. 7 shows No. 9 and No. 7 frequently used during play.
No. 5, No. 3, and No. 3 iron golf clubs were selected, and a steel ball having a particle diameter of 0.6 mm was sprayed as a metal ball in the same manner as in the case of the above-mentioned sand wedge, and the degree of backspin and the abrasion test were performed. The result of comparison with the glass-like treatment by silica sand injection (conventional product) is shown. Score lines are engraved on the ball striking surface of each iron club used in these tests. The ball used is a two-piece high spin type solid ball. Perform a real hit test with a swing robot.
s, 38m / s for 7 iron, 3 for 5 iron
The head speed was set to 40 m / s for 9 m / s and 3 irons. The graph indicated by reference numeral C in the graph of FIG. 7 is a metal ball sprayed product, and the graph indicated by reference numeral D is a conventional product. From the results shown in FIG. 7, the back spin applied to the hit ball is the largest in the case of the 9-iron having a large loft angle, and the effect of the uneven rough surface 4 of the hitting surface by the metal ball jetting process is the largest compared to the silica sand jet-processed product. The effect gradually decreases as the iron count becomes smaller, and is reversed for the third iron. This means that a short iron including a sand wedge having a large ball count has fewer runs after hitting a ball, and therefore, an accurate shot can be expected. It is shown that.

The following table shows the scratches of the hit ball.

[0019]

[Table 1]

Next, an iron golf club set according to the present invention is a set of a plurality of iron golf clubs having the above-described heads. For example, 3
Currently, a set of 7 irons from 9 irons to 9 irons, a pitching wedge, a pitching sand (approach wedge), and a sand wedge set of 10,
Of course, a combination such as a half set is also possible, and the first iron and the second iron may be included.

[0021]

As described above, according to the present invention, most of the metal ball striking surface of the head main body has a particle diameter of 0.3 to 1 mm.
Since it has an uneven rough surface formed by injecting a fine metal sphere in the range of mm, the ball hit by such a head is not easily scratched and the back spin does not decrease. In particular, in the case where the corner portion where the wall surface of the score line and the hitting surface intersect forms a round shape by injection of a metal ball, it is possible to prevent the ball from being scratched without reducing the spin effect. In addition, in the case where the hitting surface is formed smoothly and the rough surface is formed by spraying a metal ball on this hitting surface, the cumbersome work of carving score lines is unnecessary, and the backspin is reduced. Can also be suppressed. In addition, in a set in which a plurality of iron golf clubs having such a head are arranged, even if any of the iron clubs is used, the hit ball is not scratched,
With short iron, without reducing backspin,
Long irons can also reduce the spin effect and increase the distance.

[Brief description of the drawings]

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

FIG. 2 is a front view showing an embodiment in which a score line is not formed.

FIG. 3 is an enlarged sectional view of a score line portion in the embodiment shown in FIG.

FIG. 4 is a graph showing a relationship between a particle diameter of a metal sphere to be injected and a back spin.

FIG. 5 is a graph showing a relationship between a particle diameter and a back spin.

FIG. 6 is a graph showing the relationship between particle diameter and launch angle.

FIG. 7 is a graph showing a comparison between the present invention and a conventional product showing the backspin by count.

FIG. 8 is a front view showing a conventional example.

FIG. 9 is an enlarged cross-sectional view of a score line portion in a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Head main body 3 Striking surface 4 Roughness of unevenness 5 Score line 5A Groove wall 5B Angle

Claims (4)

[Claims] 1. An iron golf club having a roughened surface formed by injecting small metal spheres, most of which have a particle size in the range of 0.3 to 1 mm, onto a metal striking surface of a head body. head. 2. A plurality of score lines are engraved on the hitting surface, and a corner portion where a wall surface of the score line intersects the hitting surface by forming a rough surface is formed round by injection of the metal ball. The iron golf club head according to claim 1, wherein: 3. The iron golf club head according to claim 1, wherein a hitting surface is formed smoothly, and a rough surface is formed on the hitting surface by injection of the metal ball. 4. An iron golf club set comprising a combination of a plurality of iron golf clubs, wherein each head of the plurality of iron golf clubs is the head according to any one of claims 1 to 3. Golf club set.