JP2011234749A - Golf club head - Google Patents

Golf club head Download PDF

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Publication number
JP2011234749A
JP2011234749A JP2010105955A JP2010105955A JP2011234749A JP 2011234749 A JP2011234749 A JP 2011234749A JP 2010105955 A JP2010105955 A JP 2010105955A JP 2010105955 A JP2010105955 A JP 2010105955A JP 2011234749 A JP2011234749 A JP 2011234749A
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Japan
Prior art keywords
narrow
narrow groove
golf club
formed
club head
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Granted
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JP2010105955A
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Japanese (ja)
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JP5485780B2 (en
JP2011234749A5 (en
Inventor
Masaomi Hiruta
Ko Saka
航 坂
正臣 蛭田
Original Assignee
Bridgestone Sports Co Ltd
ブリヂストンスポーツ株式会社
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Application filed by Bridgestone Sports Co Ltd, ブリヂストンスポーツ株式会社 filed Critical Bridgestone Sports Co Ltd
Priority to JP2010105955A priority Critical patent/JP5485780B2/en
Publication of JP2011234749A publication Critical patent/JP2011234749A/en
Publication of JP2011234749A5 publication Critical patent/JP2011234749A5/ja
Application granted granted Critical
Publication of JP5485780B2 publication Critical patent/JP5485780B2/en
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    • AHUMAN NECESSITIES
    • A63SPORTS; GAMES; AMUSEMENTS
    • A63BAPPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B53/00Golf clubs
    • A63B53/04Heads
    • A63B53/047Heads iron-type
    • AHUMAN NECESSITIES
    • A63SPORTS; GAMES; AMUSEMENTS
    • A63BAPPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B53/00Golf clubs
    • A63B53/04Heads
    • A63B2053/0445Details of grooves or the like on impact surface
    • AHUMAN NECESSITIES
    • A63SPORTS; GAMES; AMUSEMENTS
    • A63BAPPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B53/00Golf clubs
    • A63B53/04Heads
    • A63B53/0466Heads wood-type

Abstract

An object of the present invention is to improve the effect of suppressing the reduction of the backspin amount by a groove smaller than the score line.
In a golf club head in which a plurality of score lines are formed on a face surface, a first narrow groove formed on the face surface and parallel to the score line, formed on the face surface, and the first surface. A second narrow groove intersecting with the narrow groove is provided.
[Selection] Figure 1

Description

  The present invention relates to a golf club head.

  Generally, a plurality of linear grooves parallel to each other in the toe-heel direction are formed on the face surface of a golf club head. This groove is called a score line, a marking line, a face line, etc. (referred to as a score line in this document). This score line has an effect of increasing the backspin amount of the hit ball or suppressing the backspin amount of the hit ball from being remarkably reduced in the case of a rainy day or a shot from the rough.

  However, the score line alone has a limit to the effect of increasing the backspin amount and the effect of suppressing the reduction of the backspin amount during rainy weather. Therefore, forming a groove finer than the score line on the face surface (for example, described in Patent Document 1) is effective in preventing reduction of the backspin amount of the hit ball.

JP 2007-202633 A

  However, the grooves that are finer than the score line are filled with water droplets immediately because they are finer than the score line. For this reason, in the case of a rainy day or a shot from the rough, the effect of suppressing the reduction of the backspin amount may not be sufficiently exhibited.

  An object of the present invention is to improve the effect of suppressing the reduction of the backspin amount due to the grooves smaller than the score line.

  According to the present invention, in the golf club head in which a plurality of score lines are formed on the face surface, the first narrow groove formed on the face surface, parallel to the score line, and formed on the face surface, A golf club head comprising a second narrow groove intersecting with the first narrow groove is provided.

  According to the present invention, it is possible to improve the effect of suppressing the reduction of the backspin amount due to the grooves smaller than the score line.

1 is an external view of a golf club head 1 according to an embodiment of the present invention and a partially enlarged view of a face surface 10. FIG. 3 is a partial cross-sectional perspective view of the face surface 10. (A) is a sectional view of the score line 20 in a direction perpendicular to the longitudinal direction (toe-heel direction), (B) is a sectional view of the narrow groove 30 in a direction perpendicular to the longitudinal direction, and (C) is Sectional drawing of the direction orthogonal to the longitudinal direction of the other example of the narrow groove 30. FIG. Sectional drawing which shows primary molded product 1 'before forming the thin grooves 30 thru | or 32. FIG. Explanatory drawing of the formation method of the narrow groove 30 by NC milling machine. FIG. 10 is a partial cross-sectional perspective view of the face surface 10 showing another example of the narrow groove 31.

<First Embodiment>
FIG. 1 is an external view of a golf club head 1 according to an embodiment of the present invention and a partially enlarged view of a face surface 10. The example in the figure shows an example in which the present invention is applied to an iron type golf club head. The present invention is suitable for an iron type golf club head, particularly a middle iron, a short iron, and a wedge type golf club head. Specifically, the loft angle is 30 degrees or more and 70 degrees or less, and the head weight is 240 g or more. Suitable for golf club heads of 320 g or less. However, the present invention can also be applied to wood type or utility type (hybrid type) golf club heads.

  The golf club head 1 has a plurality of score lines 20 formed on its face surface (striking surface) 10. Each score line 20 is a linear groove extending in the toe-heel direction and parallel to each other. In addition, a plurality of narrow grooves 30, 31, 32 are formed on the face surface 10.

  The narrow groove 30 is a groove that is smaller in width and depth than the score line 20, and is a linear groove that extends in the toe-heel direction in parallel with the score line 20. Here, the phrase “the narrow groove 30 and the score line 20 are parallel” includes the case where the crossing angle of these infinitely extended lines is not less than 0 degrees and not more than 20 degrees for reasons such as manufacturing errors.

  In the case of the present embodiment, a plurality of narrow grooves 30 are arranged in the d1 direction orthogonal to the longitudinal direction of the score line 20 and are formed in plural. The length of the fine groove 30 is preferably equal to or longer than the length of the score line 20 closest to the fine groove 30. In the present embodiment, each narrow groove 30 is a single groove that is not interrupted in the middle, but a part or all of the narrow groove 30 may be partially interrupted.

  The narrow grooves 31 and 32 are grooves that are smaller in width and depth than the score line 20 and intersect the narrow groove 30. In the case of this embodiment, the narrow grooves 31 and 32 are linear grooves.

  2 is a partial cross-sectional perspective view of the face surface 10, FIG. 3A is a cross-sectional view of the score line 20 in a direction perpendicular to the longitudinal direction (toe-heel direction), and FIG. It is sectional drawing of the direction orthogonal to the longitudinal direction. First, the score line 20 will be described.

  In the present embodiment, the score lines 20 are formed at an equal pitch, and the cross-sectional shape of the score lines 20 is the same except for both ends in the longitudinal direction. Each score line 20 has the same cross-sectional shape. Furthermore, in the case of this embodiment, the cross-sectional shape of the score line 20 is symmetric with respect to the center line in the width direction. In the case of this embodiment, the cross-sectional shape of the score line 20 is trapezoidal, but other shapes such as a V shape may be used.

  The score line 20 has a pair of side walls 21 and a bottom wall 22. An edge 23 of the score line 20 is a boundary portion between the side wall 21 and the face surface 10. In the present embodiment, it is possible to adopt a configuration in which the edge 23 is rounded but not rounded.

  Since the narrow groove 30 is formed in parallel with the score line 20, the backspin amount of the hit ball is improved. In the present embodiment, the narrow groove 30 has a semicircular cross section as shown in FIG. 3B, but may have other shapes such as a trapezoidal shape or a V shape. The width W of the narrow groove 30 is preferably 30 μm or more and 600 μm or less, for example. If the depth D of the narrow groove 30 is too shallow, the improvement in the backspin amount is low, and if it is too deep, the ball is easily damaged. In the golf club head for competition, there is a certain restriction on the surface roughness of the face surface, and the maximum height (Ry) is 25 μm or less. Therefore, when the golf club head 1 is used for competition, the depth D is preferably 5 μm or more and 25 μm or less.

  The narrow grooves 31 and 32 intersect with the narrow groove 30 and function as a water channel for draining water accumulated in the narrow groove 30. Therefore, the water accumulated in the narrow groove 30 is drained into the narrow grooves 31 and 32, or is drained through the narrow grooves 31 and 32 into another narrow groove 30 in which water is not accumulated. By draining the water accumulated in the narrow groove 30, the effect of improving the backspin amount of the hit ball by the narrow groove 30 is maintained. For this reason, the effect of suppressing the reduction of the backspin amount is improved in rainy weather.

  The water accumulated in the narrow groove 30 flows out into the narrow grooves 31 and 32 and is drained by the pressure from the ball at the time of hitting. In addition, it is preferable that the narrow grooves 31 and 32 are directed in the vertical direction from the viewpoint of draining by the weight of water other than at the time of impact. At the time of a shot, since the narrow groove 30 extends in the horizontal direction, the intersection angle between the narrow grooves 31 and 32 and the narrow groove 30 is about 90 degrees, for example, 75 degrees or more and 105 degrees or less from the viewpoint of drainage. It is preferable.

  On the other hand, in addition to the function as a drainage channel, the narrow grooves 31 and 32 can also exhibit a function of improving the backspin amount of the hit ball. In the narrow grooves 31 and 32, the backspin amount is improved in the direction closer to the parallel with the narrow groove 30. Therefore, from the viewpoint of the backspin amount, the crossing angle between the narrow grooves 31 and 32 and the narrow groove 30 is preferably around 20 degrees, for example, 5 degrees or more and 35 degrees or less.

  In addition, when the drainage property and the backspin amount are combined, the crossing angle between the narrow grooves 31 and 32 and the narrow groove 30 is preferably 20 degrees or more and 90 degrees or less.

  In the present embodiment, the narrow groove 31 and the narrow groove 32 have different lengths, the narrow groove 31 intersects with the four narrow grooves 30, and the narrow groove 32 intersects with the two narrow grooves 30. In the present embodiment, the two types of narrow grooves 31 and 32 having different lengths are formed as the narrow grooves intersecting with the narrow grooves 30 in this way. There may be three or more types. In any case, it is preferable that each narrow groove 30 intersects with at least one narrow groove. Further, as in the present embodiment, when one narrow groove 31, 32 intersects with the plurality of narrow grooves 30, the water accumulated in the narrow groove 30 is accumulated through the narrow grooves 31 or 32. It is possible to drain to another narrow groove 30 that is not present, and the drainage efficiency can be increased. Therefore, it is preferable that at least one narrow groove that intersects the narrow groove 30 intersects the plurality of narrow grooves 30.

  The cross-sectional shape, width, and depth of the narrow grooves 31 and 32 may be the same as or different from those of the narrow grooves 30. In particular, depending on the purpose, the depths of the narrow grooves 31 and 32 and the narrow groove 30 can be made different. For example, when importance is attached to an increase in the backspin amount, the narrow groove 30 is made deeper than the narrow grooves 31 and 32 to improve the bite of the ball. In addition, when it is intended to reduce the difference in backspin amount caused by water droplets during fine weather and rainy weather, the narrow grooves 31 and 32 are deeper than the narrow grooves 30 to enhance drainage.

  In the present embodiment, narrow grooves 30 to 32 are formed in the same pattern between adjacent score lines 20. This has the effect of reducing variations in the backspin amount depending on the position of the hit point. In the golf club head for competition, there are certain restrictions on the surface roughness of the face surface, the maximum height (Ry) is 25 μm or less, and the arithmetic average roughness is 4.57 μm or less. Therefore, when the golf club head 1 is used for competition, the narrow grooves 30 to 32 are designed so as to satisfy such a rule of surface roughness.

  Next, a method for forming the score line 20 and the narrow grooves 30 to 32 will be described. The score line 20 can be formed by, for example, forging, casting, cutting, or laser processing. The narrow grooves 30 to 32 can be formed by, for example, cutting or laser processing. In addition, you may employ | adopt a different processing method with the fine groove 30 and the fine grooves 31 and 32 which cross | intersect this.

  Here, the case where the score line 20 is formed by forging and the narrow grooves 30 to 32 are formed by milling will be described with reference to FIGS. 4 and 5. FIG. 4 is a cross-sectional view showing the primary molded product 1 ′ before forming the narrow groove 30, and FIG. 5 is an explanatory view of a method for forming the narrow grooves 30 to 32 using an NC milling machine.

  First, as shown in FIG. 4, a primary molded product 1 ′ of the golf club head 1 in which the score line 20 is formed by forging is created. In the primary molded product 1 ′, the narrow grooves 30 to 32 are not processed on the surface 10 ′ corresponding to the face surface 10.

  Next, the narrow groove 30 is formed by milling. As shown in FIG. 5, the primary molded product 1 ′ in which the narrow groove 30 is not processed is fixed to an NC milling machine via a jig 2. In the present embodiment, the case where the face surface 10 is integrally formed with the golf club head will be described. However, the face member constituting the face surface 10 and the head body may be joined as separate members.

  The NC milling machine has a spindle 4 that is driven to rotate about the Z axis, and a cutting tool (end mill) 5 is attached to the lower end of the spindle 4. The tip shape of the cutting tool 5 is in accordance with the cross-sectional shape of the narrow groove 30.

  Thus, in the NC milling machine, after setting the plane coordinates of the face surface 10, the spindle 4 is rotated and the face surface 10 (primary molded product 1 ′) or the cutting tool 5 is relatively moved in the direction in which the narrow grooves 30 are formed. The face surface 10 is cut while moving. When one narrow groove 30 is formed, after the cutting tool 5 is separated from the face surface 10, the cutting tool 5 is relatively moved in the arrangement direction of the narrow grooves 30 to form the next narrow groove 30. Sequentially narrow grooves 30 are formed. The narrow grooves 31 and 32 can also be formed in the same manner.

  If the narrow grooves 30 to 32 are formed on the face surface 10, the face surface 10 may be easily worn. Therefore, it is preferable to perform a surface treatment for increasing the hardness of the face surface 10 after forming the narrow grooves 30 to 32. Examples of such surface treatment include carburizing treatment, nitriding treatment, soft nitriding treatment, PVD (Physical Vepor Deposition) treatment, ion plating, DLC (diamond-like carbon) treatment, and plating treatment. In particular, surface treatment that modifies the surface without forming another metal layer on the surface, such as carburizing treatment or nitriding treatment, is preferable.

Second Embodiment
Raising the edge of the narrow groove 30 can further improve the backspin amount. FIG. 3C is a cross-sectional view of the narrow groove 30 in the present embodiment. The edge of the narrow groove 30 is raised with a raised portion 30a, so that the bite with the ball is improved and the backspin amount can be further improved. For example, when the narrow groove 30 is formed by laser processing, the raised portion 30a can be naturally formed by laser processing. Moreover, when forming the fine groove 30 by cutting, it can form as a burr | flash by roughening cutting.

<Third Embodiment>
The narrow groove intersecting with the narrow groove 30 may be formed from the edge 23 of the score line 20. FIG. 6 is a partial sectional perspective view of the face surface 10 showing another example of the narrow groove 31. In the case of the example shown in the figure, the narrow groove 31 is formed from the edge 23 of the score line 21. By forming the narrow groove 31 from the edge 23, the score line 21 and the narrow groove 31 communicate with each other. For this reason, the water in the narrow groove 31 can be drained to the score line 21, and the drainage of the narrow groove 30 can be further improved.

<Other embodiments>
Although a plurality of embodiments of the present invention have been described above, it goes without saying that these embodiments can be combined with each other.

Claims (9)

  1. In a golf club head having a plurality of score lines formed on the face surface,
    A first narrow groove formed on the face surface and parallel to the score line;
    A second narrow groove formed on the face surface and intersecting the first narrow groove;
    A golf club head comprising:
  2. Between the adjacent score lines, a plurality of the first narrow grooves are arranged in a direction orthogonal to the score lines,
    A plurality of the second narrow grooves are formed;
    2. The golf club head according to claim 1, wherein each of the first narrow grooves formed between the adjacent score lines intersects with at least one of the second narrow grooves.
  3. Between the adjacent score lines, a plurality of the first narrow grooves are arranged in a direction orthogonal to the score lines,
    A plurality of the second narrow grooves are formed;
    2. The golf club head according to claim 1, wherein at least one of the second narrow grooves intersects with two or more first narrow grooves formed between the adjacent score lines.
  4.   The golf club head according to claim 1, wherein the second narrow groove is formed from an edge of the score line.
  5.   The golf club head according to claim 1, wherein the first and second narrow grooves are formed by cutting or laser processing.
  6.   The golf club head according to claim 1, wherein an edge of the first narrow groove is raised.
  7.   2. The golf club head according to claim 1, wherein an intersection angle between the first narrow groove and the second narrow groove is 20 degrees or more and 90 degrees or less.
  8.   The golf club head according to claim 1, wherein the first narrow groove and the second narrow groove have different depths.
  9.   2. The golf club head according to claim 1, wherein a depth of the first and second narrow grooves is 5 μm or more and 25 μm or less.
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