JP6183191B2 - Golf club head - Google Patents

Description

  The present invention relates to a golf club head.

  When a golf ball is hit with a golf club, backspin is imparted to the ball. Since the backspin amount greatly affects the flight distance and the trajectory of the ball, it is desirable that the backspin amount be as constant as possible regardless of the hitting condition. This is because if the backspin amount is a constant amount regardless of the hitting condition, it is possible to hit the target position at all times.

  However, if the face surface of the golf club head, which is the contact surface with the ball, gets wet due to rain or the like, there is a problem that the backspin amount changes greatly. The change in the backspin amount is increased in the wet state than in the dry state in the driver, and is greatly decreased in the wet state in the wedge.

  Here, in order to stabilize the backspin amount, a plurality of grooves called score lines are generally provided on the face surface of the golf club head in the toe-heel direction of the golf club head. . However, since the shape of the score line and the like are strictly defined by rules, there is a limit to suppressing the change in the backspin amount during rainfall by devising the shape of the score line and the like.

  In order to solve such a problem, it has been proposed to provide a narrow groove having a width of 200 to 800 μm on the face surface (Patent Document 1). Conventionally, it has been considered that the narrow groove formed on the face surface has a higher drainage effect if it is wider. However, it has been experimentally found that even if such a relatively wide narrow groove is provided, it cannot be said that a sufficient effect of suppressing the change in the backspin amount during rainfall is obtained.

  In view of the above problems, the present inventors have proposed a golf club head in which minute grooves having an average width of 100 μm or less are formed on the face surface (Patent Document 2). According to this golf club head, it was possible to reliably suppress the change in the backspin amount during the rain. However, it has been found that a new problem arises that the amount of backspin is changed due to adhesion of ball scraps to the face surface when it is not raining.

JP 2011-234748 A JP 2013-169413 A

  In view of the above problems, an object of the present invention is to provide a golf club head capable of reliably suppressing a change in the backspin amount during both raining and non-raining.

The golf club head of the present invention is a golf club head in which a plurality of score lines and a plurality of minute grooves are formed on a face surface, and the minute grooves are formed from the score lines at a flat portion between the adjacent score lines. The micro-groove is formed when the cross-section of the portion formed with the micro-groove is spaced apart and formed in a direction substantially perpendicular to the score line and parallel to the score line and perpendicular to the face surface. The average width in the cross section is 100 μm or less, and the average pitch of the micro grooves in the cross section is 100 μm or less .

The average width of the micro grooves in the cross section is 50 μm or less, and the average pitch of the micro grooves in the cross section is 50 μm or less.

  Further, the minute groove is formed at least in the vicinity of an intersection of a perpendicular line dropped from the center of gravity of the golf club head to the face surface and the face surface.

Further, the micro groove is in a range of arbitrary distance L before Symbol section, the number of convex formed by the microgrooves n, the average value of the altitude difference of the unevenness formed by the microgrooves d, surface When the roughness is Ra, the relationship of n> L / 100 (μm), 0 <d <30 (μm), and 2 <Ra <5 (μm) is satisfied .

A golf club head having a plurality of score lines and a plurality of minute grooves formed on a face surface, wherein the minute grooves are spaced apart from the score lines in a flat portion between adjacent score lines. When the cross-section of the portion formed in the orthogonal direction, parallel to the score line and perpendicular to the face surface and where the micro-groove is formed is observed, the average width of the micro-groove in the cross-section is 100 μm. When the average pitch in the cross section of the microgroove is 100 μm or less, the drainage of water is promoted by capillary action, and the change in the backspin amount during rainfall can be reliably suppressed. Further, at the time of non-rainfall, the microgrooves direction and back spin direction of the ball is less likely to adhere shavings balls face by a substantially coincident to Turkey, reliably suppress the change in backspin can do.

  Further, when the average width in the cross section of the microgroove is 50 μm or less and the average pitch in the cross section of the microgroove is 50 μm or less, the microgroove is thinly and densely formed, so that A change in the amount can be reliably suppressed.

  Further, the micro groove is formed at least in the vicinity of the intersection of the perpendicular line drawn from the center of gravity of the golf club head to the face surface and the face surface, thereby forming the micro groove on the contact surface with the ball. In addition, changes in the backspin amount during rain can be reliably suppressed.

Further, the micro groove is in a range of arbitrary distance L before Symbol section, the number of convex formed by the microgrooves n, the average value of the altitude difference of the unevenness formed by the microgrooves d, surface When the roughness is Ra, the relationship of n> L / 100 (μm), 0 <d <30 (μm), 2 <Ra <5 (μm) is satisfied. It is promoted, and the change of the backspin amount during the rain can be surely suppressed .

1 is a front view of a golf club head of Example 1. FIG. 1 is a sectional view of a face surface of a golf club head of Example 1. FIG. 3 is a graph showing the backspin amount of the golf club head of Example 1. 4 is a graph showing changes in the backspin amount of the golf club head of Example 1; 6 is a front view of a golf club head of Example 2. FIG. 4 is a cross-sectional view of a face surface of a golf club head of Example 2. FIG. 6 is a graph showing the back spin amount of the golf club head of Example 2. 6 is a graph showing the backspin amount of the golf club head of Example 3. 6 is a front view of a golf club head of Example 4. FIG.

  Hereinafter, embodiments of the golf club head of the present invention will be described with reference to the accompanying drawings.

  In FIG. 1 showing the golf club head of the present embodiment, reference numeral 1 denotes an iron type golf club head, and a plurality of score lines 3 are formed in parallel to each other on the face surface 2 of the golf club head 1. A plurality of minute grooves 4 are formed in the face surface 2 in a direction perpendicular to the score line 3. The minute grooves 4 are formed apart from the score line 3 in a flat portion between adjacent score lines 3 so as not to interfere with the score line 3. That is, the minute groove 4 is formed so as not to enter the score line 3.

  In the present embodiment, the minute groove 4 is formed in a direction orthogonal to the score line 3, but is not limited thereto, and may be formed in a direction obliquely intersecting the score line 3. For example, the minute groove 4 is formed in an arbitrary direction between a direction orthogonal to the score line 3 and a direction inclined by 30 ° from the direction orthogonal to the score line 3 to the toe side (side to which the shaft is not connected). can do.

  Further, in the region where the microgroove 4 is formed, the microgroove 4 is preferably formed so as to occupy a region of 50% or more of the area of the flat portion between the adjacent score lines 3. Note that if it is less than 50%, it is difficult to reliably suppress the change in the backspin amount, which is not preferable.

  Here, as shown in FIG. 1, a cross section of a portion parallel to the score line 3 and perpendicular to the face surface 2 and having the minute groove 4 is defined as A-A ′. Hereinafter, the description of the shape such as the width of the minute groove 4 is based on the cross section A-A ′.

  The cross section AA ′ is as shown in FIG. 2. When this cross section is observed, the average width of the microgroove 4 in this cross section is 100 μm or less, and the cross section of the microgroove 4 is The average pitch at is 100 μm or less. More preferably, the average width of the micro grooves 4 in this cross section is 50 μm or less, and the average pitch is 50 μm or less. The irregularities of the minute grooves 4 are regularly formed. Here, if the average width of the micro grooves 4 exceeds 100 μm and the average pitch exceeds 100 μm, the backspin amount of the ball when hitting the ball is greatly reduced under the wet condition where the face surface 2 is wetted with water. The average width of the minute grooves 4 is preferably 100 μm or less, and the average pitch is preferably 100 μm or less.

  In this embodiment, the minute groove 4 is provided in the entire area where the score line 3 is provided. However, the present invention is not limited to this, and the minute groove 4 is lowered from the center of gravity of the golf club head 1 to the face surface 2 at least. It suffices if it is formed in the vicinity of the intersection of the perpendicular and the face surface 2, that is, in the contact area with the ball at the time of hitting.

  More specifically, in the cross section shown in FIG. 2, the number of protrusions formed by the minute grooves 4 in the range of an arbitrary distance L is n, and the average value of the height difference of the unevenness formed by the minute grooves 4 is d Satisfying the relationship of n> L / 100 (μm), 0 <d <30 (μm), and 2 <Ra <5 (μm), where Ra is the surface roughness in the region where the microgrooves 4 are formed. Thus, the minute groove 4 is formed. In the figure, W1, W2, W3,..., Wn indicate protrusions formed by the minute grooves 4 in the range of an arbitrary distance L, and d1, d2, d3,. The height difference of the unevenness | corrugation formed by each microgroove 4 in a cross section is shown.

  The microgroove 4 is formed by a process including laser processing. Specifically, first, the base of the golf club head 1 is polished, and a nickel plating layer as a first plating layer is formed on the base with a thickness of, for example, 20 μm. Next, the nickel plating layer is grooved by laser processing. Thereafter, a chromium plating layer as a second plating layer is formed thereon with a thickness of, for example, 5 μm. By such a process, the minute groove 4 is formed. In this embodiment, the nickel plating layer is subjected to laser processing. However, the present invention is not limited to this, and the fine groove 4 may be formed by applying laser processing to the substrate or the chromium plating layer. In other words, in this embodiment, micro grooves are formed in the order of polishing, nickel plating, unevenness formation by laser processing, and chromium plating, but not limited to this, the order of polishing, laser processing, nickel plating, and chromium plating. Alternatively, polishing, nickel plating, chromium plating, and laser processing may be performed in this order.

  The backspin amount of the ball at the time of hitting was evaluated for the golf club head of this example that was actually created. A golf club (Example 1) provided with the golf club head of this example in which minute grooves are formed in a direction perpendicular to the score line, and a golf club head (Comparative Example 1) in which minute grooves are not formed as a comparative example, Golf clubs each having a golf club head (Comparative Example 2) in which minute grooves were formed in parallel to the score line were prepared. The count of the golf club was a wedge with a loft angle of 56 °, and all the conditions were the same in this example and the comparative example, except for the presence or absence and orientation of the minute groove. The surface roughness in the region where the microgrooves were formed was as follows: Example 1: Ra = 3.8, Rt = 16, Comparative Example 1: Ra = 0.5, Rt = 4.8, Comparative Example 2: Ra = 4.2 and Rt = 19. The width of the microgroove was 50 μm, the pitch was 50 μm, the depth was 20 μm, the width of the score line was 0.88 mm, and the pitch was 3.5 mm. Each golf club was evaluated using a swing robot under dry conditions where the face surface was dry and wet conditions where the face surface was wet with water. The result is shown in FIG.

  Under the dry conditions where the face surface was dry, the backspin amount of Example 1 was 8541 rpm, 8409 rpm for Comparative Example 1 and 8558 rpm for Comparative Example 2, and there was almost no difference in the backspin amount.

  On the other hand, under the wet condition where the face surface was wet with water, the backspin amount of Example 1 was 7410 rpm, 4719 rpm in Comparative Example 1, 6951 rpm in Comparative Example 2, and backspin in Comparative Example 1 in which no microgroove was formed. In Comparative Example 2 in which the amount was 56% and the minute grooves were formed in parallel with the score line, the amount decreased to 81%, whereas in Example 1, the backspin amount only decreased to 87%.

  In addition, when a plurality of balls are continuously hit under dry conditions where the face surface is dry, a phenomenon in which the backspin amount gradually decreases as the number of hits of the balls increases in Comparative Example 2 as shown in FIG. Was seen. Therefore, when the face surface was observed, scraped balls were attached to the ball hitting portion. On the other hand, in Example 1, even when a plurality of balls were hit consecutively, the backspin amount hardly decreased, and the amount of scraped balls adhering to the face surface was small. This is probably because the direction of the minute groove and the direction of the backspin of the ball almost coincide with each other so that the shavings of the ball are less likely to adhere to the face surface.

  Therefore, according to the golf club head 1 of the present example, it was proved that the change in the backspin amount can be surely suppressed in both wet conditions during rain and dry conditions during non-rain.

  As described above, the golf club head of this embodiment is the golf club head 1 in which a plurality of score lines 3 and a plurality of minute grooves 4 are formed on the face surface 2, and the minute grooves 4 are the score lines 3. When a cross-section of a portion that is formed in a direction perpendicular to the score line 3 away from the score line 3 and that is parallel to the score line 3 and perpendicular to the face surface 2 and where the minute groove 4 is formed is observed. The average width of the micro grooves 4 in the cross section is 100 μm or less, and the average pitch of the micro grooves 4 in the cross section is 100 μm or less. A change in spin amount can be reliably suppressed. In addition, when it is not raining, the direction of the minute groove and the direction of the backspin of the ball substantially coincide with each other, so that the ball shavings are less likely to adhere to the face surface and the change in the backspin amount can be reliably suppressed. Can do.

  Further, since the average width in the cross section of the microgroove 4 is 50 μm or less and the average pitch in the cross section of the microgroove is 50 μm or less, the microgrooves are formed finely and densely, and the back during rain A change in spin amount can be reliably suppressed.

  Further, the minute groove 4 is formed in the vicinity of the intersection of at least the perpendicular line drawn from the center of gravity of the golf club head 1 to the face surface 2 and the face surface 2, so that the minute groove is formed on the contact surface with the ball. Thus, the change in the backspin amount during rainfall can be reliably suppressed.

  The minute groove 4 is formed in a flat portion between the adjacent score lines 3, and the number of protrusions formed by the minute groove 4 in the range of an arbitrary distance L in the cross section is n, and the minute groove 4 is formed. When the average value of the height difference of the unevenness formed by the grooves 4 is d and the surface roughness is Ra, n> L / 100 (μm), 0 <d <30 (μm), 2 <Ra <5 ( By satisfying the relationship (μm), the drainage of water is promoted by the capillary phenomenon, and the change in the backspin amount during the rain can be reliably suppressed.

  Further, since the minute groove 4 is formed by a process including laser processing, the minute groove can be easily formed.

  The golf club head 1 includes a base, a nickel plating layer as a first plating layer provided on the base, and a chromium plating layer as a second plating layer provided on the nickel plating layer. The fine groove 4 is formed by forming a groove on the nickel plating layer by laser processing and then applying a chromium plating layer thereon, thereby improving the aesthetics of the face surface.

  As shown in FIGS. 5 and 6, the golf club head of this example is the same as Example 1 except that the minute grooves 4 are thinned out at regular intervals.

  As shown in FIG. 6, the microgroove 4 of this embodiment is formed by continuously forming 15 microgrooves, and then continuously forming 15 microgrooves again at intervals of 3 microgrooves. It is formed in such a manner that an interval of three minute grooves is formed again. As a result, there are regions on the face surface 2 in which minute grooves are not formed at regular intervals.

  The backspin amount of the ball at the time of hitting was evaluated for the golf club head of this example that was actually created. A golf club (Example 2) provided with the golf club head of this example in which minute grooves thinned out at regular intervals were formed in a direction perpendicular to the score line, and a golf club head (as a comparative example) in which minute grooves were not formed ( Comparative examples 1) and golf clubs each having a golf club head (Comparative Example 2) in which minute grooves were formed in parallel with the score line were prepared. The count of the golf club was a wedge with a loft angle of 56 °, and all the conditions were the same in this example and the comparative example, except for the presence or absence and orientation of the minute groove. The surface roughness in the region where the microgroove was formed was as follows: Example 2: Ra = 2.9, Rt = 17, Comparative Example 1: Ra = 0.5, Rt = 4.8, Comparative Example 2: Ra = 4.2 and Rt = 19. The width of the microgroove was 50 μm, the pitch was 50 μm, the depth was 20 μm, the depth of the score line was 0.88 mm, and the pitch was 3.5 mm. Each golf club was evaluated using a swing robot under dry conditions where the face surface was dry and wet conditions where the face surface was wet with water. The result is shown in FIG.

  Under dry conditions where the face surface was dry, the backspin amount of Example 2 was 8812 rpm, Comparative Example 1 was 8409 rpm, and Comparative Example 2 was 8558 rpm, and there was almost no difference in the backspin amount.

  On the other hand, under the wet condition where the face surface was wet with water, the backspin amount of Example 2 was 7132 rpm, 4719 rpm in Comparative Example 1, 6951 rpm in Comparative Example 2, and backspin in Comparative Example 1 in which no microgroove was formed. While the amount decreased to 56%, the backspin amount in Example 2 only decreased to 81%. In Example 2, the density of the microgrooves is reduced due to the thinning of the microgrooves, which is considered to be the same value as in Comparative Example 2.

  The golf club head of the present embodiment described above is the golf club head 1 in which a plurality of score lines 3 and a plurality of minute grooves 4 are formed on the face surface 2 in the same manner as in the first embodiment. Is formed in a direction perpendicular to the score line 3 apart from the score line 3, and is a cross-section of a portion parallel to the score line 3 and perpendicular to the face surface 2 where the microgroove 4 is formed When the average width in the cross section of the microgroove 4 is 100 μm or less and the average pitch in the cross section of the microgroove 4 is 100 μm or less, moisture discharge is promoted by capillary action. In addition, changes in the backspin amount during rain can be reliably suppressed.

  Further, since the minute grooves 4 are thinned out at a constant interval, the gloss of the face surface 2 changes between a portion where the minute grooves 4 are provided and a portion where the minute grooves 4 are not provided, so that the design is further improved.

  In the golf club head of the present embodiment, the base of the golf club head 1 is provided with micro grooves 4 by laser processing, and then a nickel plating layer is formed with a thickness of 20 μm, and then a chromium plating layer is formed thereon with a thickness of 5 μm. It is formed with a thickness, and is the same as Example 1 except that the manufacturing process is different from Example 1. In the golf club head of Example 1, a nickel plating layer having a thickness of 20 μm is formed on the ground of the golf club head 1, and then a groove is formed on the nickel plating layer by laser processing. A chrome plating layer is formed with a thickness of 5 μm.

  The backspin amount of the ball at the time of hitting was evaluated for the golf club head of this example that was actually created. A golf club (Example 3) provided with the golf club head of this example in which minute grooves are formed in a direction perpendicular to the score line on the base of the golf club head, and a golf club head having no minute grooves as a comparative example Golf clubs provided with (Comparative Example 1) were prepared. The count of the golf club was a wedge having a loft angle of 56 °, and all the conditions were the same in this example and in the comparative example except for the presence or absence of a minute groove. In addition, the surface roughness in the area | region in which the micro groove | channel was formed was Example 3: Ra = 3.4, Rt = 20, Comparative example 1: Ra = 0.5, Rt = 4.8. The width of the microgroove was 50 μm, the pitch was 50 μm, the depth was 20 μm, the depth of the score line was 0.88 mm, and the pitch was 3.5 mm. Each golf club was evaluated using a swing robot under dry conditions where the face surface was dry and wet conditions where the face surface was wet with water. The result is shown in FIG.

  Under dry conditions where the face surface was dry, the backspin amount of Example 3 was 8868 rpm, and that of Comparative Example 1 was 8409 rpm, and there was almost no difference in the backspin amount.

  On the other hand, under wet conditions where the face surface was wet with water, the backspin amount of Example 3 was 6402 rpm, and Comparative Example 1 was 4719 rpm, and the backspin amount was reduced to 56% in Comparative Example 1 in which no microgroove was formed. On the other hand, the backspin amount in Example 3 was only reduced to 72%.

  As shown in FIG. 9, the golf club head of this example is the same as Example 1 except that the outer edge of the region where the minute grooves 4 are provided is a substantially equilateral triangle. Note that an intersection of a perpendicular drawn from the center of gravity of the golf club head 1 to the face surface 2 and the face surface 2 is located in the vicinity of the center of the region where the minute groove 4 is provided.

  In the golf club head of the present embodiment described above, the minute groove 4 is formed at least in the vicinity of the intersection of the perpendicular to the face surface 2 from the center of gravity of the golf club head 1 and the face surface 2. By forming a minute groove on the contact surface with the ball, it is possible to reliably suppress the change in the backspin amount during the rain.

  In addition, this invention is not limited to said embodiment, A various deformation | transformation implementation is possible.

1 golf club head 2 face surface 3 score line 4 minute groove

Claims (4)

A golf club head having a plurality of score lines and a plurality of minute grooves formed on a face surface, wherein the minute grooves are spaced apart from the score lines in a flat portion between adjacent score lines. When the cross-section of the portion formed in the orthogonal direction, parallel to the score line and perpendicular to the face surface and where the micro-groove is formed is observed, the average width of the micro-groove in the cross-section is 100 μm. The golf club head according to claim 1, wherein an average pitch of the micro grooves in the cross section is 100 μm or less. The average width in the cross section of the fine groove is not more 50μm or less, the golf club head of claim 1, wherein the average pitch of the cross section of the micro groove is 50μm or less. 3. The golf club head according to claim 1, wherein the minute groove is formed in the vicinity of an intersection of at least a perpendicular line drawn from the center of gravity of the golf club head to the face surface and the face surface. The microgrooves, the extent of any distance L before Symbol section, the average value of d, the surface roughness of the altitude difference of irregularities formed a number of convex formed by the microgrooves n, by the microgrooves Is Ra,
n> L / 100 (μm),
0 <d <30 (μm),
2 <Ra <5 (μm)
Any one golf club head according to claim 1 to 3, characterized by satisfying the relationship.

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