US20150246268A1 - Golf club head - Google Patents

Golf club head Download PDF

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Publication number
US20150246268A1
US20150246268A1 US14/436,371 US201314436371A US2015246268A1 US 20150246268 A1 US20150246268 A1 US 20150246268A1 US 201314436371 A US201314436371 A US 201314436371A US 2015246268 A1 US2015246268 A1 US 2015246268A1
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United States
Prior art keywords
area
projection
face
projections
average value
Prior art date
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Abandoned
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US14/436,371
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English (en)
Inventor
Hiroshi Abe
Tatsuhiko Kuwabara
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dunlop Sports Co Ltd
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Dunlop Sports Co Ltd
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Assigned to DUNLOP SPORTS CO. LTD. reassignment DUNLOP SPORTS CO. LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ABE, HIROSHI, KUWABARA, TATSUHIKO
Publication of US20150246268A1 publication Critical patent/US20150246268A1/en
Abandoned legal-status Critical Current

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    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B53/00—Golf clubs
    • A63B53/04—Heads
    • A63B53/0466—Heads wood-type
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B53/00—Golf clubs
    • A63B53/04—Heads
    • A63B53/0408—Heads characterised by specific dimensions, e.g. thickness
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B53/00—Golf clubs
    • A63B53/04—Heads
    • A63B53/0416—Heads having an impact surface provided by a face insert
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B53/00—Golf clubs
    • A63B53/04—Heads
    • A63B53/045—Strengthening ribs
    • A63B53/0454—Strengthening ribs on the rear surface of the impact face plate
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B60/00—Details or accessories of golf clubs, bats, rackets or the like
    • A63B60/52—Details or accessories of golf clubs, bats, rackets or the like with slits
    • A63B2053/0408—
    • A63B2053/0458—
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B53/00—Golf clubs
    • A63B53/04—Heads
    • A63B53/0458—Heads with non-uniform thickness of the impact face plate
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B53/00—Golf clubs
    • A63B53/04—Heads
    • A63B53/047—Heads iron-type

Definitions

  • the present invention relates to a golf club head.
  • Japanese Patent Application Laid-Open No. 2012-95855 discloses a head having a face part with a thickness distribution.
  • the face part includes a middle thick part, a toe-crown side thin-walled part provided on a crown side of the middle thick part on a toe side of the middle thick part and having a small thickness, and a heel-sole side thin-walled part provided on a sole side of the middle thick part on a heel side of the middle thick part and having a small thickness.
  • rebound performance in an off center shot is improved by providing the thin-walled part on a peripheral part of a face.
  • Patent Literature 1 JP-A-2012-95855
  • a golf club head of the present invention includes a face, a sole, and a crown.
  • the face includes a face surface and a face back surface.
  • a plurality of projections (A) are provided on the face back surface.
  • the projections (A) are point-like in a planar view.
  • first direction and a second direction orthogonal to the first direction are defined in the planar view.
  • arrangement regularity of the projections (A) in the second direction is higher than arrangement regularity of the projections (A) in the first direction.
  • the first direction is a longitudinal direction; and the second direction is a lateral direction.
  • An area of each of the projections (A) in the planar view is defined as Ma.
  • the two or more kinds of projections (A) have areas Ma substantially different from each other.
  • the projections (A) include a projection (A 1 ) of which the area Ma is an area Ma 1 , a projection (A 2 ) of which the area Ma is an area Ma 2 , and a projection (A 3 ) of which the area Ma is an area Ma 3 .
  • the area Ma 1 is greater than the area Ma 2 .
  • the area Ma 2 is greater than the area Ma 3 .
  • the projection (A 2 ) is disposed on a face peripheral side with respect to the projection (A 1 ) in the first direction.
  • the projection (A 3 ) is disposed on a face peripheral side with respect to the projection (A 2 ) in the first direction.
  • a longitudinal distance between a periphery of the face back surface and the projection (A 1 ) is defined as a 1 .
  • a longitudinal distance between the periphery of the face back surface and the projection (A 2 ) is defined as a 2 .
  • a longitudinal distance between the periphery of the face back surface and the projection (A 3 ) is defined as a 3 .
  • An average value of the distances a 1 is defined as Av 1 .
  • An average value of the distances a 2 is defined as Av 2 .
  • An average value of the distances a 3 is defined as Av 3 .
  • the average value Av 1 is greater than the average value Av 2 .
  • the average value Av 2 is greater than the average value Av 3 .
  • an area Ma of each of the projections (A) is 3 mm 2 or greater and 40 mm 2 or less in the planar view.
  • a height Ha of each of the projections (A) is 0.03 mm or greater and 0.2 mm or less.
  • a middle projection arrangement region including a face back surface center is present as one of the projection arrangement regions.
  • arrangement regularity in the second direction is higher than arrangement regularity in the first direction in the middle projection arrangement region.
  • the head is manufactured by joining a face member and another member.
  • the face member is manufactured by forging.
  • the forging includes a preceding forging step and a subsequent forging step.
  • projections (B) higher than the projections (A) are formed on the face back surface in the preceding forging step.
  • the projections (A) are formed by crushing the projections (B) in the subsequent forging step.
  • a golf club head being lightweight and having a high strength can be obtained.
  • FIG. 1 is a perspective view of a golf club head according to a first embodiment of the present invention
  • FIG. 2 is an exploded perspective view of the head of FIG. 1 ;
  • FIG. 3 is a plan view of a back surface of a face member, and projections (A) are omitted in FIG. 3 ;
  • FIG. 4 is a cross-sectional view taken along line F 4 -F 4 of FIG. 3 ;
  • FIG. 5 is a plan view of the back surface of the face member;
  • FIGS. 6( a ), 6 ( b ), and 6 ( c ) are plan views showing the shapes of the projections (A);
  • FIG. 7 is a plan view for describing arrangement regularity
  • FIG. 8 is a plan view of a face back surface according to a second embodiment
  • FIG. 9 is a plan view of a face back surface according to a third embodiment.
  • FIG. 10 is a plan view of a face back surface according to a fourth embodiment.
  • FIG. 11 is a plan view of a face back surface according to a fifth embodiment.
  • FIG. 12 is a plan view of a face back surface according to a sixth embodiment.
  • FIG. 1 is a perspective view of a golf club head 2 according to a first embodiment of the present invention.
  • the head 2 includes a face 4 , a crown 6 , a sole 8 , and a hosel 10 .
  • the face 4 includes a face surface fs.
  • the face surface fs is a hitting surface.
  • the crown 6 extends toward the back of the head from the upper edge of the face 4 .
  • the sole 8 extends toward the back of the head from the lower edge of the face 4 .
  • the head 2 is hollow.
  • the head 2 is a wood type golf club head.
  • FIG. 2 is an exploded perspective view of the head 2 .
  • the head 2 has a four-piece structure.
  • Members constituting the head 2 are a face member Fp 1 , a sole member Sp 1 , a crown member Cp 1 , and a hosel member Hp 1 .
  • the head 2 is manufactured by welding these members.
  • FIG. 3 is a plan view showing a back surface fr of the face member Fp 1 .
  • FIG. 4 is a cross-sectional view taken along line F 4 -F 4 of FIG. 3 .
  • a plurality of projections (A) are formed on the back surface fr. However, these projections (A) are omitted in FIGS. 3 and 4 .
  • the face member Fp 1 constitutes the whole face 4 . Furthermore, the face member Fp 1 includes a backward extending part Fp 2 (see FIG. 4 ). The backward extending part Fp 2 constitutes a part of the crown 6 . The backward extending part Fp 2 constitutes a part of the sole 8 . The face member Fp 1 including the backward extending part Fp 2 is also referred to as a cup face. A boundary k 1 between the face member Fp 1 and the other portion is shown by a two-dot chain line in FIG. 1 . The boundary k 1 is not visually recognized in the completed coated head 2 .
  • the hosel 10 includes a shaft hole 12 to which a shaft is attached.
  • the shaft which is not shown is inserted into the shaft hole 12 .
  • the shaft hole 12 has a center axis line Z 1 .
  • the center axis line Z 1 coincides with a shaft axis line of a golf club including the head 2 .
  • a base perpendicular plane, a face-back direction, and a toe-heel direction are defined.
  • a state where the center axis line Z 1 is included in a plane P 1 perpendicular to a level surface H and the head 2 is placed at a predetermined lie angle and real loft angle on the level surface H is defined as a base state.
  • the plane P 1 is defined as a base perpendicular plane.
  • the predetermined lie angle and real loft angle are described in, for example, a product catalog.
  • the toe-heel direction is a direction of an intersection line between the base perpendicular plane and the level surface H.
  • the face-back direction is a direction perpendicular to the toe-heel direction and parallel to the level surface H.
  • a face center is defined.
  • a maximum width Wx in the toe-heel direction is determined.
  • a middle position Px of the maximum width Wx in the toe-heel direction is determined.
  • a middle point Py of the face surface in an up-down direction is determined. The point Py is defined as the face center.
  • an up-down direction is defined.
  • the up-down direction is a direction perpendicular to the face-back direction and perpendicular to the toe-heel direction.
  • a longitudinal direction Dy is defined (see FIG. 3 ).
  • the longitudinal direction Dy is a direction of a projection straight line obtained by projecting a straight line drawn in the up-down direction onto a specific plane Ps (see FIG. 4 ).
  • the specific plane Ps is a plane perpendicular to a straight line LN (described later).
  • a lateral direction Dx is defined (see FIG. 3 ).
  • the lateral direction Dx is a direction on the specific plane Ps, and perpendicular to the longitudinal direction Dy.
  • the lateral direction Dx is equal to the toe-heel direction.
  • a first direction D 1 and a second direction D 2 are defined.
  • the first direction D 1 and the second direction D 2 are directions on the specific plane Ps.
  • the first direction D 1 may be any direction.
  • the second direction D 2 is orthogonal to the first direction D 1 .
  • the longitudinal direction Dy is an example of the first direction D 1 .
  • the lateral direction Dx is an example of the second direction D 2 .
  • the planar view means a projection image Psi to the specific plane Ps.
  • the projection direction is a direction of a face normal line (described later).
  • a face back surface center CR is defined.
  • the straight line LN in FIG. 4 is a normal line of the face surface fs passing through a face center CF.
  • An intersection point between the normal line LN and the face back surface fr is the face back surface center.
  • the direction of the straight line LN is defined as the direction of the face normal line.
  • the face member Fp 1 may be divided into a plurality of regions based on a face thickness TF.
  • division lines are formed in the face back surface fr. These division lines can be recognized visually as ridge lines. In a cross-sectional view, the ridge line has a roundness.
  • the whole face back surface fr smoothly continues.
  • the face back surface fr includes a region S, a region Bt, a region Bh, a region Ct, a region Ch, a region Da, a region Db, a region Et, and a region Eh. Regions other than these regions are transition regions having the thickness TF gradually changed.
  • the height of each of the projections (A) is not included in the face thickness TF.
  • FIG. 3 hatching is applied to only the region S. Hatching is omitted in the other regions.
  • the region S is located in a middle part of the face 4 .
  • the region S includes a face center position. In other words, the region S includes the face back surface center.
  • the region Bt is located below the region S.
  • the region Bt is located on a toe side with respect to the face center.
  • the region Bt is located below the face center.
  • the region Bh is located above the region S.
  • the region Bh is located on a heel side with respect to the face center.
  • the region Bh is located above the face center.
  • the region Ct is located on a toe side with respect to the region S.
  • the region Ct is located on a toe side with respect to the face, center.
  • the region Ct includes a face center up-down position.
  • the face center up-down position is a position of the face center in the up-down direction.
  • the region Ch is located on a heel side with respect to the region S.
  • the region Ch is located on a heel side with respect to the face center.
  • the region Ch includes the face center up-down position.
  • the region Da is located above the region S.
  • the region Da is located above the face center.
  • the region Da includes a face center right-left position.
  • the face center right-left position is a position of the face center in the toe-heel direction.
  • the region Db is located below the region S.
  • the region Db is located below the face center.
  • the region Db includes the face center right-left position.
  • the center of gravity of the region Et is located on a toe side with respect to the region S.
  • the region Et is located on a toe side with respect to the face center.
  • the region Et does not include the face center up-down position.
  • the region Et does not include the face center right-left position.
  • the center of gravity of the region Et is located above the center of gravity of the region Ct.
  • the center of gravity of the region Eh is located on a heel side with respect to the region S.
  • the region Eh is located on a heel side with respect to the face center.
  • the region Eh does not include the face center up-down position.
  • the region Eh does not include the face center right-left position.
  • the center of gravity of the region Eh is located below the center of gravity of the region Ch.
  • the thickness TF of each region is as follows.
  • the difference between the maximum value and the minimum value of the thickness TF in each region is preferably equal to or less than 0.15 mm, and more preferably equal to or less than 0.1 mm.
  • the region S is a maximum thickness region Tm. If the maximum value of the face thickness TF is defined as Tmax (mm), the maximum thickness region Tm means a region in which the face thickness TF is equal to or greater than [Tmax ⁇ 0.2] mm.
  • the face thickness TF is a thickness in the direction of the face normal line.
  • the face back surface fr has at least a projection arrangement region.
  • the projection arrangement region has two or more projections (A).
  • the projection arrangement regions are the region S, the region Ct, the region Ch, the region Et, and the region Eh.
  • a plurality of projections (A) are arranged on the face back surface fr.
  • the plurality of projections (A) are arranged in each of the longitudinal direction Dy and the lateral direction Dx.
  • an area of each of the projections (A) in the planar view is defined as Ma.
  • the two or more kinds of projections (A) having the areas Ma substantially different from each other are provided on the face back surface fr.
  • the three kinds of projections (A) having the areas Ma substantially different from each other are provided.
  • the phrase “substantially different” means that the difference between the areas Ma is equal to or greater than 5%.
  • the three kinds of projections (A) include a projection (A 1 ), a projection (A 2 ), and a projection (A 3 ).
  • the area Ma of the projection (A 1 ) is Ma 1 .
  • the area Ma of the projection (A 2 ) is Ma 2 .
  • the area Ma of the projection (A 3 ) is Ma 3 .
  • the area Ma 1 , the area Ma 2 , and the area Ma 3 are substantially different.
  • each of the projections (A) is shown by reference character Ta.
  • the projection (A 1 ) is shown by reference character Ta 1 .
  • the projection (A 2 ) is shown by reference character Ta 2 .
  • the projection (A 3 ) is shown by reference character Ta 3 .
  • Stress acting on the face is likely to be dispersed at random by providing the two or more kinds of projections (A) having the areas Ma substantially different from each other.
  • the dispersion of the stress can relieve stress concentration to improve a face strength.
  • FIGS. 6( a ), 6 ( b ), and 6 ( c ) show examples of point-like projections Ta.
  • FIG. 6( a ) shows a circular projection Ta. In the embodiment of FIG. 5 , all the projections Ta are circular.
  • FIG. 6( b ) shows an elliptical projection Ta.
  • FIG. 6( c ) shows an irregular projection Ta.
  • a longest transversal line CL 1 in an outline in the planar view is determined. Furthermore, a transversal line CL 2 which is the longest among transversal lines perpendicular to the longest transversal line is determined. A length of the transversal line CL 1 is defined as N 1 , and a length of the transversal line CL 2 is defined as N 2 .
  • the transversal line CL 1 is a long axis, and the transversal line CL 2 is a short axis.
  • N 1 /N 2 is equal to or less than 8 is defined to be point-like.
  • N 1 /N 2 is preferably equal to or less than 5, more preferably equal to or less than 2, and still more preferably equal to or less than 1.5.
  • N 1 /N 2 is equal to or greater than 1. In the case of the circle, N 1 /N 2 is 1.
  • Examples of the shape of the projection Ta in the planar view include a regular polygon as well as the above-mentioned circle and ellipse.
  • Examples of the regular polygon include a square, a regular pentagon, and a regular hexagon. In respect of equally dispersing the stress acting on the face 4 , the shape is preferably the circle.
  • the projections (A) are point-like, and thereby the strength of the face can be improved without thickening the whole face.
  • the plurality of projections (A) are dispersively disposed, and thereby the face strength can be improved in a wide range without thickening the whole face.
  • the point-like projections (A) can be disposed at positions where an improvement in the strength is required, and thereby the degree of freedom of design of the face is improved. Therefore, a face 4 being lightweight and having a high strength can be obtained.
  • the point-like projections (A) are suitable for obtaining a strength improvement effect (described later) caused by forging.
  • FIG. 7 is a view for describing the arrangement regularity.
  • the first direction D 1 is the longitudinal direction Dy and the second direction D 2 is the lateral direction Dx is described.
  • the arrangement regularity is estimated in the planar view.
  • a lateral direction line Lx and a longitudinal direction line Ly are considered.
  • the lateral direction line Lx is a straight line extending in the lateral direction Dx.
  • the longitudinal direction line Ly is a straight line extending in the longitudinal direction Dy.
  • a lateral direction line Lx 1 , a lateral direction line Lx 2 , and a lateral direction line Lx 3 are determined as the lateral direction line Lx.
  • a longitudinal direction line Ly 1 , a longitudinal direction line Ly 2 , and a longitudinal direction line Ly 3 are determined as the longitudinal direction line Ly.
  • ten projections Ta are disposed. That is, a projection 102 , a projection 104 , a projection 106 , a projection 108 , a projection 110 , a projection 112 , a projection 114 , a projection 116 , a projection 118 , and a projection 120 are disposed.
  • the projection 102 , the projection 104 , and the projection 106 intersect with a first lateral direction line Lx 1 .
  • the projection 108 , the projection 110 , and the projection 112 intersect with a second lateral direction line Lx 1 .
  • the projection 114 , the projection 116 , and the projection 118 intersect with a third lateral direction line Lx 1 .
  • the projection 106 , the projection 112 , and the projection 118 intersect with a first longitudinal direction line Ly 1 .
  • the projection 104 , the projection 110 , and the projection 116 intersect with a first longitudinal direction line Ly 2 .
  • the projection 102 , the projection 108 , and the projection 114 intersect with a third longitudinal direction line Ly 3 .
  • a center of figure of the projection Ta is shown by reference character gt in FIG. 7 .
  • a distance between the center of figure gt of the projection Ta and the lateral direction line Lx is shown by a double-headed arrow xd in FIG. 7 .
  • the lateral direction line Lx intersects with the two or more projections Ta.
  • the number of the lateral direction line Lx which intersects with one projection Ta is one.
  • each of the three lateral direction lines Lx intersects with the three projections Ta.
  • the projection Ta intersecting with the lateral direction line Lx is a measurement target for the distance xd.
  • the projection Ta which does not intersect with the lateral direction line Lx may also be assumed.
  • the projection 120 which does not intersect with the lateral direction line Lx is also a measurement target for the distance xd.
  • the distance xd is measured between the center of figure gt of the projection Ta and the lateral direction line Lx closest to the center of figure gt.
  • a distance between the center of figure gt of the projection Ta and the longitudinal direction line Ly is shown by a double-headed arrow yd in FIG. 7 .
  • the longitudinal direction line Ly intersects with two or more projections Ta.
  • the number of the longitudinal direction line Ly which intersects with one projection Ta is one.
  • each of the three longitudinal direction lines Ly intersects with three projections Ta.
  • the projection Ta intersecting with the longitudinal direction line Ly is a measurement target for the distance yd. Furthermore, as shown in FIG. 7 , the projection 120 which does not intersect with the longitudinal direction line Ly is also a measurement target for the distance yd.
  • the distance yd is measured between the center of figure gt of the projection Ta and the longitudinal direction line Ly (Ly 3 ) closest to the center of figure gt.
  • An average value Xv 1 of the distances xd and an average value Yv 1 of the distances yd are calculated. If a plurality of average values Xv 1 can be calculated, the minimum value of the average values Xv 1 is employed. If a plurality of average values Yv 1 can be calculated, the minimum value of the average values Yv 1 is employed.
  • the difference of the arrangement regularity causes a projection arrangement effect.
  • a deformation in the toe-heel direction and a deformation in the up-down direction are defined.
  • the deformation in the toe-heel direction in the present application means a deformation in which the fold by the deformation is generated in the up-down direction.
  • the deformation in the up-down direction in the present application means a deformation in which the fold by a deformation is generated in the toe-heel direction.
  • the deformation in which the fold is generated in the up-down direction is less likely to occur by decreasing the arrangement regularity in the longitudinal direction Dy. That is, the deformation in the toe-heel direction is less likely to occur by decreasing the arrangement regularity in the longitudinal direction Dy.
  • the length of the face in the toe-heel direction is greater than the length of the face in the up-down direction. For this reason, the deformation in the toe-heel direction is likely to be greater than the deformation in the up-down direction.
  • the deformation in the toe-heel direction can be effectively suppressed by decreasing the arrangement regularity in the longitudinal direction Dy.
  • the face strength can be improved by suppressing the excessive deformation.
  • the deformation in the up-down direction is not excessively suppressed by increasing the arrangement regularity in the lateral direction Dx. Therefore, the deterioration in rebound performance can be suppressed. Balance between the deformation in the toe-heel direction and the deformation in the up-down direction is favorable, and thereby the face strength can be optimized.
  • Selective suppression of a deformation in a predetermined direction may be desired due to variation in hitting points, and design of a face thickness, or the like.
  • the direction in which the suppression of the deformation is desired can be set to the second direction.
  • the arrangement regularity of the projections (A) in the second direction is set to be higher than the arrangement regularity of the projections (A) in the first direction. The deformation in the second direction can be effectively suppressed by the arrangement.
  • the number of the projections Ta (projections Ta 1 ) intersecting with the first lateral direction line Lx 1 is X 1 .
  • X 1 is 10.
  • X 1 is preferably equal to or greater than 5, more preferably equal to or greater than 6, and still more preferably equal to or greater than 7.
  • X 1 is preferably equal to or less than 15, more preferably equal to or less than 14, and still more preferably equal to or less than 13.
  • the number of the projections Ta (projections Ta 1 ) intersecting with the second lateral direction line Lx 2 is X 2 .
  • X 2 is 11.
  • X 2 is preferably equal to or greater than 5, more preferably equal to or greater than 6, and still more preferably equal to or greater than 7.
  • X 2 is preferably equal to or less than 15, more preferably equal to or less than 14, and still more preferably equal to or less than 13.
  • the number of the projections Ta (projections Ta 1 ) intersecting with the third lateral direction line Lx 3 is X 3 .
  • X 3 is 9.
  • X 3 is preferably equal to or greater than 5, more preferably equal to or greater than 6, and still more preferably equal to or greater than 7.
  • X 3 is preferably equal to or less than 15, more preferably equal to or less than 14, and still more preferably equal to or less than 13.
  • the arrangement regularity in the lateral direction Dx is higher than the arrangement regularity in the longitudinal direction Dy in the whole face back surface fr.
  • the arrangement regularity in the lateral direction Dx is higher than the arrangement regularity in the longitudinal direction Dy in the projection arrangement region S.
  • the projection arrangement region S is a middle projection arrangement region S including the face back surface center CR. Large stress acts on the middle projection arrangement region S when a ball is hit. A portion on which the large stress acts can be selectively and effectively reinforced by applying the projection arrangement effect to the region S.
  • the arrangement regularity in the lateral direction Dx is higher than the arrangement regularity in the longitudinal direction Dy in the projection arrangement region Ct.
  • the region Ct is a toe side projection arrangement region located on a toe side with respect to the region S.
  • the arrangement regularity in the lateral direction Dx is higher than the arrangement regularity in the longitudinal direction Dy in the projection arrangement region Ch.
  • the region Ch is a heel side projection arrangement region located on a heel side with respect to the region S.
  • the arrangement regularity in the lateral direction Dx is higher than the arrangement regularity in the longitudinal direction Dy in the projection arrangement region Et.
  • the difference of the arrangement regularity can be applied.
  • the projection arrangement effect can be applied to a desired projection arrangement region according to the application. Therefore, a region requiring a strength can be selectively reinforced.
  • the projection Ta 2 is disposed on a face peripheral side with respect to the projection Ta 1 .
  • the projection Ta 3 is disposed on a face peripheral side with respect to the projection Ta 2 .
  • the position of the projection Ta is estimated based on the center of figure gt.
  • a longitudinal distance between the periphery of the face back surface fr and the projection Ta 1 is defined as a 1 .
  • a longitudinal distance between the periphery of the face back surface fr and the projection Ta 2 is defined as a 2 .
  • a longitudinal distance between the periphery of the face back surface fr and the projection Ta 3 is defined as a 3 .
  • the longitudinal distance for each of the projections Ta is measured.
  • the average value of the distances a 1 is defined as Av 1 .
  • the average value of the distances a 2 is defined as Av 2 .
  • the average value of the distances a 3 is defined as Av 3 .
  • the average value Av 1 is greater than the average value Av 2 .
  • the average value Av 2 is greater than the average value Av 3 .
  • the stress acting on the face 4 is comparatively large in the middle part of the face 4 .
  • the stress acting on the face 4 is comparatively small in the peripheral part of the face 4 .
  • the projection Ta of which the area Ma is comparatively small is disposed in the peripheral part of the face 4
  • the projection Ta of which the area Ma is comparatively large is disposed in the middle part of the face 4 .
  • the area Ma of the projection (A) (projection Ta) is 3 mm 2 or greater and 40 mm 2 or less. In this range, the strength of the face 4 can be effectively improved while the increase in the mass of the face 4 is suppressed.
  • the area Ma 1 of the projection (A 1 ) (projection Ta 1 ) is 12 mm 2 or greater and 40 mm 2 or less. In this range, the strength of the face 4 can be effectively improved while the increase in the mass of the face 4 is suppressed.
  • the projection (A) having the area Ma different from the area Ma 1 can be easily provided by limiting the area Ma 1 to the range.
  • the area Ma 2 of the projection (A 2 ) (projection Ta 2 ) is 6 mm 2 or greater and 30 mm 2 or less. In this range, the strength of the face 4 can be effectively improved while the increase in the mass of face 4 is suppressed.
  • the projection (A) having the area Ma different from the area Ma 2 can be easily provided by limiting the area Ma 2 to the range.
  • the area Ma 3 of the projection (A 3 ) (projection Ta 3 ) is 3 mm 2 or greater and 20 mm 2 or less. In this range, the strength of the face 4 can be effectively improved while the increase in the mass of face 4 is suppressed.
  • the projection (A) having the area Ma different from the area Ma 3 can be easily provided by limiting the area Ma 3 to the range.
  • the height Ha of the projection (A) is preferably equal to or greater than 0.03 mm, more preferably equal to or greater than 0.05 mm, and still more preferably equal to or greater than 0.07 mm.
  • the height Ha is preferably equal to or less than 0.2 mm, more preferably equal to or less than 0.17 mm, and still more preferably equal to or less than 0.15 mm.
  • FIG. 8 is a plan view showing a face back surface fr of a face member Fp 20 according to a second embodiment.
  • the plan view shows the above-mentioned projection image Psi. Except for the projections Ta, the face member Fp 20 is the same as the face member Fp 1 .
  • a projection occupation ratio Rs is considered in the face member Fp 20 .
  • the ratio Rs of the middle projection arrangement region S is smaller than the ratio Rs of the other region.
  • the ratio Rs of the region S is smaller than the ratio Rs of the region Et.
  • the ratio Rs of the region S is smaller than the ratio Rs of the region Ct.
  • the ratio Rs of the region S is smaller than the ratio Rs of the region Eh.
  • the ratio Rs of the region S is smaller than the ratio Rs of the region Ch.
  • the ratio Rs is a ratio of the total area of the projections (A) to the area of the entire region.
  • the ratio Rs is determined in the planar view.
  • the projection occupation ratio Rs of a face middle part is decreased, and the projection occupation ratio Rs of a face peripheral part is increased. Since the hardness of the peripheral part is further improved, the thickness of the peripheral part can be decreased. Therefore, the whole face 4 is likely to bend, which can provide the enlargement of a sweet area.
  • FIG. 9 is a plan view showing a face back surface fr of a face member Fp 30 according to a third embodiment.
  • the plan view shows the above-mentioned projection image Psi. Except for projections Ta, the face member Fp 30 is the same as the face member Fp 1 .
  • the projection occupation ratio Rs of a middle projection arrangement region S is greater than the ratios Rs of the other regions.
  • the ratio Rs of the region S is greater than the ratio Rs of the region Et.
  • the ratio Rs of the region S is greater than the ratio Rs of the region Ct.
  • the ratio Rs of the region S is greater than the ratio Rs of the region Eh.
  • the ratio Rs of the region S is greater than the ratio Rs of the region Ch.
  • the projection occupation ratio Rs of a face middle part is increased. Since the hardness of the middle part is further improved, the thickness of the middle part can be decreased. Therefore, the bending of the face 4 when a ball is hit with the middle part is increased. For this reason, rebound performance when the ball is hit with the face middle part is improved, which can provide an increase in the maximum value of a coefficient of restitution. A maximum flight distance can be increased by the increase.
  • FIG. 10 is a plan view showing a face back surface fr of a face member Fp 40 according to a fourth embodiment.
  • the plan view shows the above-mentioned projection image Psi. Except for the projections Ta, the face member Fp 40 is the same as the face member Fp 1 .
  • the arrangement regularity of the projections (A) in a second direction D 2 is higher than the arrangement regularity of the projections (A) in a first direction D 1 .
  • the second direction D 2 is inclined so as to be an upper side toward a toe side.
  • An angle between a lateral direction Dx and the second direction D 2 is shown by a double-headed arrow ⁇ 1 in FIG. 10 .
  • the golfer has variation in hitting points.
  • the golfer's hitting points tend to be distributed between the upper side of a toe and the lower side of a heel.
  • the arrangement of the projections (A) is adapted for the distribution of the hitting points by inclining the second direction D 2 with respect to the lateral direction Dx. For this reason, the projection arrangement effect can be further improved.
  • the lower limit of the angle ⁇ 1 is preferably equal to or greater than 10 degrees, and more preferably equal to or greater than 15 degrees.
  • the upper limit of the angle ⁇ 1 is preferably equal to or less than 50 degrees, and more preferably equal to or less than 45 degrees.
  • FIG. 11 is a plan view showing a face back surface fr of a face member Fp 50 according to a fifth embodiment.
  • the plan view shows the above-mentioned projection image Psi. Except for the projections Ta, the face member Fp 50 is the same as the face member Fp 1 .
  • a projection Ta 2 is disposed between projections Ta 1 .
  • the area Ma 2 of the projection Ta 2 is smaller than the area Ma 1 of the projection Ta 1 .
  • the projection occupation ratio Rs is effectively improved by the disposition.
  • Ma 2 /Ma 1 is preferably equal to or less than 0.3, and more preferably equal to or less than 0.2.
  • Ma 2 /Ma 1 is preferably equal to or greater than 0.02, and more preferably equal to or greater than 0.05.
  • FIG. 12 is a plan view showing a face back surface fr of a face member Fp 60 according to a sixth embodiment.
  • the plan view shows the above-mentioned projection image Psi. Except for the projections Ta, the face member Fp 60 is the same as the face member Fp 1 .
  • the projection Ta has an ellipse shape.
  • the long axis of the ellipse is substantially parallel to a lateral direction Dx.
  • the absolute value of an angle between the long axis of the ellipse and the lateral direction Dx is equal to or less than 10 degrees.
  • the projection Ta may not have the ellipse shape, and may have a shape shown in FIG. 6( c ), for example.
  • the absolute value of an angle between the longest transversal line CL 1 and the lateral direction Dx is preferably equal to or less than 10 degrees.
  • the projection arrangement effect can be further improved by the constitution.
  • the volume of the head is not limited. The present invention is effective when a face area is large.
  • the volume of the head is preferably equal to or greater than 400 cc, more preferably equal to or greater than 420 cc, and still more preferably equal to or greater than 440 cc.
  • the volume of the head is preferably equal to or less than 470 cc, and more preferably equal to or less than 460 cc.
  • the weight of the head is not limited. In respect of a swing balance, the weight of the head is preferably equal to or greater than 175 g, more preferably equal to or greater than 180 g, and still more preferably equal to or greater than 185 g. In respect of the swing balance, the weight of the head is preferably equal to or less than 205 g, more preferably equal to or less than 200 g, and still more preferably equal to or less than 195 g.
  • a method for manufacturing the head is not limited. Usually, a hollow head is manufactured by joining two or more members. A method for manufacturing the members constituting the head is not limited. Examples of the method include casting, forging, and press forming.
  • a method for manufacturing the face member Fp is not limited. Examples of the method include casting, forging, and press forming. However, the forging is preferable as described later.
  • a method for forming the projections (A) is not limited. The projections (A) may be formed simultaneously with the formation of the face member Fp, and process for forming the projections (A) may be performed after the formation of the face member Fp. Examples of the process include cutting by NC process, and chemical milling. As described later, the projections (A) are preferably formed by forging the face member Fp.
  • the structure of the head is not limited. Examples of the structure of the head include a two-piece structure in which two members each integrally formed are joined, a three-piece structure in which three members each integrally formed are joined, and a four-piece structure in which four members each integrally formed are joined.
  • the head 2 has the four-piece structure.
  • the face member Fp 1 is manufactured by forging. If the projection (B) is crushed to form the projection (A), the forging number of the face member Fp 1 is multiple.
  • the forging number is 2 or greater and 4 or less. In respect of productivity, the forging number is preferably 2 or 3, and more preferably 2.
  • the first forging is also referred to as rough forging.
  • the last forging is also referred to as main forging.
  • a plurality of forgings include a preceding forging step and a subsequent forging step.
  • the subsequent forging step is performed after the preceding forging step. If the forging number is 2, the first forging is the preceding forging step, and the second forging is the subsequent forging step. If the forging number is equal to or greater than 3, it is preferable that the last forging is the subsequent forging step and the forging immediately prior to the last forging is the preceding forging step.
  • the forging may be cold forging or hot forging.
  • the hot forging is preferable.
  • the approximate shape of the face member Fp 1 is formed, and the projection (B) is formed.
  • the projection (B) is higher than the projection (A).
  • the projection (B) is crushed in the subsequent forging step.
  • the crushed projection (B) constitutes the projection (A).
  • the projection (B) is crushed to form the projection (A), and thereby distortion is generated in metal crystal grains to produce recrystallization.
  • the metal structure is densified by the recrystallization.
  • the distortion can be generated by the crushing, to cause work hardening.
  • the projection (B) is crushed to form the projection (A), and thereby the strength of the face member Fp 1 can be improved.
  • the projection (B) is crushed, the projection (B) is not completely crushed, and the projection (A) remains. Therefore, an effect caused by the crushing is obtained. At the same time, the formation of the projection (A) is also achieved.
  • the height of the projection (B) is defined as Hb.
  • the height of the projection (A) is defined as Ha.
  • Hb/Ha is preferably equal to or greater than 1.5, more preferably equal to or greater than 2, and still more preferably equal to or greater than 3.
  • Hb/Ha is preferably equal to or less than 15, more preferably equal to or less than 12, and still more preferably equal to or less than 10.
  • the lower limit of the height Hb is preferably equal to or greater than 0.2 mm, and more preferably equal to or greater than 0.3 mm.
  • the upper limit of the height Hb is preferably equal to or less than 1.5 mm, and more preferably equal to or less than 1.2 mm.
  • the area of the projection (B) in the planar view is defined as My.
  • the area My is smaller than the area Ma.
  • the area Ma of the projection (A) is made to be greater than the area My by the crushing.
  • Ma/My is preferably equal to or greater than 1.2, more preferably equal to or greater than 1.5, and still more preferably equal to or greater than 2.
  • Ma/My is preferably equal to or less than 20, more preferably equal to or less than 15, and still more preferably equal to or less than 12.
  • the height Hb of the projection (B) for forming the projection (A) is greater as the area Ma of the projection (A) is larger.
  • Example the effects of the present invention will be clarified by Example.
  • the present invention should not be interpreted in a limited way based on the description of the Example.
  • a face member Fp 1 , a sole member Sp 1 , a crown member Cp 1 , and a hosel member Hp 1 as shown in FIG. 2 were obtained by forging.
  • a titanium alloy was used as a material for all the members.
  • the material of the face member Fp 1 was “Super-TIX 51AF” (trade name) manufactured by NIPPON STEEL & SUMITOMO METAL CORPORATION.
  • the forging number of the face member Fp 1 was set to 2.
  • the face member Fp 1 was manufactured by a preceding forging step and a subsequent forging step. Both the preceding forging step and the subsequent forging step were hot forging.
  • a round bar as a material was subjected to the preceding forging step in a state where the round bar was set in a preceding forging mold.
  • a preceding forged molded body was obtained in the preceding forging step.
  • the outer shape of the preceding forged molded body was substantially the same as the outer shape of the face member Fp 1 as a last molded body.
  • the preceding forged molded body had projections (B). The positions and number of the projections (B) were made the same as the positions and number of the projections (A) shown in FIG. 5 .
  • the projections (B) included a projection (B 1 ) of which the height Hb was Hb 1 , a projection (B 2 ) of which the height Hb was Hb 2 , and a projection (B 3 ) of which the height Hb was Hb 3 .
  • the height Hb 1 was greater than the height Hb 2 .
  • the height Hb 2 was greater than the height Hb 3 .
  • the height Hb 1 was set to 1 mm.
  • the height Hb 2 was set to 0.4 mm.
  • the height Hb 3 was set to 0.3 mm.
  • the preceding forged molded body was subjected to the subsequent forging step in a state where the preceding forged molded body was set in a subsequent forging mold.
  • a subsequent forged molded body (face member Fp 1 shown in FIG. 5 ) was obtained in the subsequent forging step.
  • the subsequent forged molded body had a projection (A 1 ), a projection (A 2 ), and a projection (A 3
  • the projection (B 1 ) was crushed to form the projection (A 1 ).
  • the projection (B 2 ) was crushed to form the projection (A 2 ).
  • the projection (B 3 ) was crushed to form the projection (A 3 ).
  • the area Ma 1 of the projection (A 1 ) was 15 mm 2 .
  • the height Ha 1 of the projection (A 1 ) was 0.1 mm.
  • the area Ma 2 of the projection (A 2 ) was 12 mm 2 .
  • the height Ha 2 of the projection (A 2 ) was 0.1 mm.
  • the area Ma 3 of the projection (A 3 ) was 9 mm 2 .
  • the height Ha 3 of the projection (A 3 ) was 0.1 mm.
  • the face member Fp 1 and the other members were welded to obtain a head of Example as shown in FIG. 1 .
  • a 46-inch golf club was produced by using the head.
  • a face member having no projection (A) was produced by changing a forging mold.
  • a face thickness was added as compared with Example.
  • the face thickness was added to each of regions shown in FIG. 3 .
  • the additional thickness was made the same as the height of the projection (A) which was present in each of the regions.
  • a head and a golf club of Comparative Example were obtained in the same manner as in Example except for the constitution.
  • Comparative Example had no projection (A)
  • manufacturing conditions in Comparative Example were made the same as manufacturing conditions in Example.
  • Forging conditions such as the forging number in Comparative Example were also made the same as forging conditions in Example.
  • a swing robot was equipped with a golf club, and repeatedly hit a commercially available two-piece ball at a head speed of 54 m/s. A hitting point was set to a face center. It was visually confirmed whether cracks were generated on a face surface for every 100 hits.
  • Example the hitting number when the cracks were confirmed was 10400. In Comparative Example, the hitting number when the cracks were confirmed was 10500. Although the face of Example was more lightweight than the face of Comparative Example, the face strength of Example was equivalent to the face strength of Comparative Example.
  • the present invention can be applied to all golf club heads such as a wood type head, a utility type head, a hybrid type head, and an iron type head.

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  • Wood Science & Technology (AREA)
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JP2017086766A (ja) * 2015-11-16 2017-05-25 株式会社遠藤製作所 アイアンゴルフクラブヘッドの製造方法とそのアイアンゴルフクラブヘッド
US20190201758A1 (en) * 2014-02-20 2019-07-04 Parsons Xtreme Golf, LLC Golf club heads and methods to manufacture golf club heads
US11058929B2 (en) 2018-07-12 2021-07-13 Karsten Manufacturing Corporation Golf club head faceplates with lattices
US11141633B2 (en) 2014-02-20 2021-10-12 Parsons Xtreme Golf, LLC Golf club heads and methods to manufacture golf club heads

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US10751587B2 (en) 2014-05-15 2020-08-25 Karsten Manufacturing Corporation Club heads having reinforced club head faces and related methods
US12102892B2 (en) 2014-05-15 2024-10-01 Karsten Manufacturing Corporation Club heads having reinforced club head faces and related methods
US10758789B2 (en) 2017-12-22 2020-09-01 Karsten Manufacturing Corporation Golf club head with variable face thickness
WO2022094436A1 (en) * 2020-10-30 2022-05-05 Karsten Manufacturing Corporation Golf club head with insert

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US20190201758A1 (en) * 2014-02-20 2019-07-04 Parsons Xtreme Golf, LLC Golf club heads and methods to manufacture golf club heads
US10821339B2 (en) * 2014-02-20 2020-11-03 Parsons Xtreme Golf, LLC Golf club heads and methods to manufacture golf club heads
US11141633B2 (en) 2014-02-20 2021-10-12 Parsons Xtreme Golf, LLC Golf club heads and methods to manufacture golf club heads
JP2017086766A (ja) * 2015-11-16 2017-05-25 株式会社遠藤製作所 アイアンゴルフクラブヘッドの製造方法とそのアイアンゴルフクラブヘッド
US11058929B2 (en) 2018-07-12 2021-07-13 Karsten Manufacturing Corporation Golf club head faceplates with lattices
US11745062B2 (en) 2018-07-12 2023-09-05 Karsten Manufacturing Corporation Golf club head faceplates with lattices

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WO2014061733A1 (ja) 2014-04-24
US10722763B2 (en) 2020-07-28

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