Multi-piece golf club head

Abstract

A golf club head and a method of making the golf club head including bonding tape. The method additionally includes positioning the first piece, the second piece, and the bonding tape, interposed between the first piece and the second piece, in a vacuum bag, and reducing a pressure within the vacuum bag, relative to a pressure external to the vacuum bag, such that the vacuum bag collapses onto the first piece and the second piece and compresses the bonding tape between the first piece and the second piece. The method also includes heating the bonding tape, at least to a curing temperature of the bonding tape, when the pressure within the vacuum bag is reduced.

1 . (canceled) 
     
     
         2 . A golf club head, comprising:
 a face, a sole, a crown, a leading edge, and a trailing edge wherein:
 the face has a roll radius, a bulge radius, and a face center, and the face defines a loft plane that is tangent to the face center, an origin for an x-axis, a y-axis, and a z-axis, wherein the x-axis is tangential to the face at the origin and parallel to a ground plane, the y-axis is perpendicular to the x-axis and extends away from the face center toward the trailing edge and is parallel to the ground plane, and the z-axis extends vertically from the face center and is perpendicular to the ground plane; 
   a front body portion formed of a front body material, surrounding the face, and at least a portion of the front body portion extends toward the trailing edge a distance of at least 20 mm from the origin, measured along the y-axis, and no more than 70 mm, and comprises a lower opening;   a hosel portion with a hosel bore defining a shaft axis and a shaft axis plane;   an adjustable head-shaft connection assembly coupled to the hosel portion and aligned with the lower opening, wherein the adjustable head-shaft connection assembly comprises a fastener received within a portion of the lower opening, and the adjustable head-shaft connection assembly is operable to releasably attach the golf club head to a golf club shaft and adjust at least one of a loft angle or a lie angle;   at least one aft-body component adhesively attached to the front body portion and forming a portion of the sole and a portion of the crown;   a forward weight attached to the front body portion, and the forward weight having a forward weight center of gravity;   a rear mass element attached to the golf club head and having a mass element center of gravity located at a mass element CGx coordinate, a mass element CGy coordinate, a mass element CGz coordinate, and a mass element Zup, wherein:
 the mass element CGy coordinate is 40-65% of the roll radius; 
 a front-rear weight separation distance is a distance from the mass element center of gravity to the forward weight center of gravity, and the front-rear weight separation distance is 30-65% of the roll radius; and 
   the golf club head has a club head mass of 180-210 grams and a volume of 390-500 cm 3 .   
     
     
         3 . The golf club head of  claim 2 , wherein the mass element CGy coordinate is at least 42% of the roll radius, the front-rear weight separation distance is at least 32% of the roll radius, a face-back dimension is a minimum distance between the loft plane and a rearwardmost point plane, where the rearwardmost point plane is parallel to the loft plane and contacts a rearwardmost point of the golf club head, and a face section extends from the loft plane to 25% of the face-back dimension, a middle section extends from 25% to 75% of the face-back dimension and has a middle section weight, a back section extends from 75% to 100% of the face-back dimension, and no more than 20% of the middle section weight is attributable to a material having a density between 4 g/cc and 20 g/cc. 
     
     
         4 . The golf club head of  claim 3 , wherein the mass element CGy coordinate is at least 44% of the roll radius, the front-rear weight separation distance is at least 34% of the roll radius, at least 95% of the middle section weight is attributable to a material having a density between 0.9 g/cc and 4 g/cc. 
     
     
         5 . The golf club head of  claim 3 , wherein the mass element Zup is 7.5-15.5% of the roll radius, the golf club head has an Ixx moment of inertia about a CG x-axis of 280-440 kg-mm 2 , and the Ixx moment of inertia is at least 65% an Izz moment of inertia about a CG z-axis. 
     
     
         6 . The golf club head of  claim 5 , wherein the forward weight is interchangeable with the rear mass element. 
     
     
         7 . The golf club head of  claim 6 , wherein the at least one aft-body component comprises a non-metal composite crown panel and a sole panel. 
     
     
         8 . The golf club head of  claim 7 , wherein:
 a face center horizontal plane passes through the face center and contains the x-axis and the y-axis;   an imaginary line originates at a center of gravity of the golf club head and extends forward to intersect the loft plane at a 90 degree angle;   a BP plane contains the imaginary line and is perpendicular to the loft plane;   a portion of the non-metal composite crown panel extends below the face center horizontal plane; and   a portion of the sole panel extends above the BP plane.   
     
     
         9 . The golf club head of  claim 7 , wherein the at least one aft-body component comprises a rear ring adhesively attached to the front body portion at a toe-side joint and a heel-side joint, with the non-metal composite crown panel adhesively attached to a portion of the rear ring and a portion of the front body portion, and the sole panel is adhesively attached to a portion of the rear ring and a portion of the front body portion. 
     
     
         10 . The golf club head of  claim 9 , wherein the front body material is titanium alloy, the rear ring comprises aluminum alloy, and the Izz moment of inertia is 450-700 kg-mm 2 . 
     
     
         11 . The golf club head of  claim 5 , wherein the golf club head has an externally exposed surface area and at least 50% of the externally exposed surface area located above a face center horizontal plane is formed of non-metallic materials, where the face center horizontal plane passes through the face center and contains the x-axis and the y-axis. 
     
     
         12 . The golf club head of  claim 11 , wherein at least 50% of the externally exposed surface area located below the face center horizontal plane is formed of non-metallic materials. 
     
     
         13 . The golf club head of  claim 11 , wherein:
 the Ixx moment of inertia is at least 68-75% of the Izz moment of inertia;   the golf club head has a center of gravity defining a club head CGy dimension of 41-47 mm, a club head Zup elevation above the ground plane of 23-27 mm, a BP projection of −1 mm to 4 mm, a delta2 value of 35.5-40 mm, a delta1 value, and a delta2-1 differential of less than 10 mm;   the golf club head has a hosel axis moment of inertia of at least 900 kg·mm 2 ;   a delta2-hosel-axis ratio is at least 24 kg·mm, where the delta2-hosel-axis ratio is a ratio of the hosel axis moment of inertia to the delta2 value;   the Ixx moment of inertia is 380-430 kg-mm 2 ;   the Izz moment of inertia is 560-600 kg-mm 2 ; and   the volume is 420-465 cm 3 .   
     
     
         14 . The golf club head of  claim 3 , wherein:
 a face center horizontal plane passes through the face center and contains the x-axis and the y-axis;   an imaginary line originates at a center of gravity of the golf club head and extends forward to intersect the loft plane at a 90 degree angle;   a BP plane contains the imaginary line and is perpendicular to the loft plane; and   the mass element center of gravity is located below the face center horizontal plane and above the BP plane.   
     
     
         15 . The golf club head of  claim 3 , wherein the face has a face height, and a roll-to-FH ratio of the roll radius to the face height is 3.25-4.25. 
     
     
         16 . The golf club head of  claim 3 , wherein the face comprises a face plate attached to the front body portion and having a face plate mass of 15-35 grams, a face profile width of 40-65 mm, a face profile length of 80-120 mm, and a front surface area of at least 3400 mm 2 . 
     
     
         17 . The golf club head of  claim 3 , wherein the forward weight includes a heel forward weight and a toe forward weight, wherein:
 a face center vertical plane includes the y-axis and the z-axis, and divides a toe side of the golf club head located between the face center vertical plane and a toeward-most extent of the golf club head, and a heel side of the golf club head located between the face center vertical plane and a heelward-most extent of the golf club head;   the heel forward weight is located in the heel side and has a heel forward weight center of gravity located at a heel forward weight CGy coordinate and a heel forward weight Zup;   the toe forward weight is located in the toe side and has a toe forward weight center of gravity located at a toe forward weight CGy coordinate and a toe forward weight Zup;   the golf club head has a center of gravity having a club head Zup elevation above the ground plane; and   a forward weight separation distance is measured from the heel forward weight center of gravity to the toe forward weight center of gravity, and the forward weight separation distance is 110-275% of the club head Zup elevation.   
     
     
         18 . The golf club head of  claim 17 , wherein the heel forward weight CGy coordinate is 9.5-25% of the roll radius, and the toe forward weight CGy coordinate is 9.5-25% of the roll radius. 
     
     
         19 . The golf club head of  claim 18 , wherein the rear mass element is interchangeable with the heel forward weight and the toe forward weight, and the front-rear weight separation distance is 105-275% of the forward weight separation distance. 
     
     
         20 . The golf club head of  claim 19 , wherein the rear mass element includes a heel rear mass element and a toe rear mass element, wherein:
 the heel rear mass element has a heel rear mass element center of gravity located at a heel rear mass element CGy coordinate and a heel rear mass element Zup;   the toe rear mass element has a toe rear mass element center of gravity located at a toe rear mass element CGy coordinate and a toe rear mass element Zup; and   the heel rear mass element CGy coordinate and the toe rear mass element CGy coordinate are 44-65% of the roll radius.   
     
     
         21 . The golf club head of  claim 20 , wherein a rear weight separation distance is measured from the heel rear mass element center of gravity to the toe rear mass element center of gravity, the rear weight separation distance is no more than 75% of the front-rear weight separation distance, the toe rear mass element Zup is 70-150% of the rear weight separation distance, and the front body portion has a front body portion mass of no more than 100 grams. 
     
     
         22 . The golf club head of  claim 20 , wherein:
 the at least one aft-body component comprises a rear ring adhesively attached to the front body portion at a toe-side joint and a heel-side joint, with a non-metal composite crown panel adhesively attached to a portion of the rear ring and a portion of the front body portion, and a sole panel is adhesively attached to a portion of the rear ring and a portion of the front body portion;   the rear ring has a ring mass;   the heel rear mass element has a heel element mass;   the toe rear mass element has a toe element mass;   a RRP mass is a sum of the heel element mass and the toe element mass; and   the RRP mass is greater than the ring mass.   
     
     
         23 . The golf club head of  claim 3 , wherein the front body portion has a rearwardmost point that is a point on the front body portion that is furthest from an origin x-axis vertical plane, where the origin x-axis vertical plane is a vertical plane parallel to the shaft axis plane and containing the x-axis, an extension distance separates the rearwardmost point from the origin x-axis vertical plane, a center of gravity of the golf club head is located a club head CGy dimension from the origin x-axis vertical plane, and the club head CGy dimension is less than the extension distance. 
     
     
         24 . The golf club head of  claim 3 , further including a face plate is adhesively bonded to the front body portion, and the face plate is formed of a face plate material that is different from the front body material. 
     
     
         25 . The golf club head of  claim 24 , wherein the sole has a sole areal weight of less than about 0.35 g/cm 2  over more than about 50% of the sole, the face plate is a composite face plate comprising nonmetallic composite materials, and the crown has a crown areal weight less than the sole areal weight. 
     
     
         26 . The golf club head of  claim 3 , wherein the face comprises non-metallic reinforcement material on an interior side of the face. 
     
     
         27 . The golf club head of  claim 26 , wherein the face has an average face density is less than 4 g/cc. 
     
     
         28 . A golf club head, comprising:
 a face, a sole, a crown, a leading edge, and a trailing edge wherein:
 the face has a roll radius, a bulge radius, and a face center, and the face defines a loft plane that is tangent to the face center, an origin for an x-axis, a y-axis, and a z-axis, wherein the x-axis is tangential to the face at the origin and parallel to a ground plane, the y-axis is perpendicular to the x-axis and extends away from the face center toward the trailing edge and is parallel to the ground plane, and the z-axis extends vertically from the face center and is perpendicular to the ground plane; 
   a front body portion formed of a front body material, surrounding the face, and at least a portion of the front body portion extends toward the trailing edge a distance of at least 20 mm from the origin, measured along the y-axis, and no more than 70 mm, and comprises a lower opening;   a hosel portion with a hosel bore defining a shaft axis and a shaft axis plane;   an adjustable head-shaft connection assembly coupled to the hosel portion and aligned with the lower opening, wherein the adjustable head-shaft connection assembly comprises a fastener received within a portion of the lower opening, and the adjustable head-shaft connection assembly is operable to releasably attach the golf club head to a golf club shaft and adjust at least one of a loft angle or a lie angle;   at least one aft-body component adhesively attached to the front body portion and forming a portion of the sole and a portion of the crown;   a forward weight attached to the front body portion, and the forward weight having a forward weight center of gravity;   a rear mass element attached to the golf club head and having a mass element center of gravity located at a mass element CGx coordinate, a mass element CGy coordinate, a mass element CGz coordinate, and a mass element Zup, wherein:
 the mass element CGy coordinate is 40-65% of the roll radius; 
 a front-rear weight separation distance is a distance from the mass element center of gravity to the forward weight center of gravity, and the front-rear weight separation distance is 30-65% of the roll radius; 
   the golf club head has a club head mass of 180-210 grams and a volume of 390-500 cm 3 ;   the golf club head has an externally exposed surface area and at least 50% of the externally exposed surface area located above a face center horizontal plane is formed of non-metallic materials, where the face center horizontal plane passes through the face center and contains the x-axis and the y-axis.   a face center horizontal plane passes through the face center and contains the x-axis and the y-axis;   an imaginary line originates at a center of gravity of the golf club head and extends forward to intersect the loft plane at a 90 degree angle;   a BP plane contains the imaginary line and is perpendicular to the loft plane;   the mass element center of gravity is located below the face center horizontal plane and above the BP plane; and   the golf club head has an Ixx moment of inertia about a CG x-axis of at least 65% of an Izz moment of inertia about a CG z-axis.   
     
     
         29 . A golf club head, comprising:
 a face, a sole, a crown, a leading edge, and a trailing edge wherein:
 the face has a roll radius, a bulge radius, and a face center, and the face defines a loft plane that is tangent to the face center, an origin for an x-axis, a y-axis, and a z-axis, wherein the x-axis is tangential to the face at the origin and parallel to a ground plane, the y-axis is perpendicular to the x-axis and extends away from the face center toward the trailing edge and is parallel to the ground plane, and the z-axis extends vertically from the face center and is perpendicular to the ground plane; 
   a front body portion formed of a front body material, surrounding the face, and at least a portion of the front body portion extends toward the trailing edge a distance of at least 20 mm from the origin, measured along the y-axis, and no more than 70 mm, and comprises a lower opening;   a hosel portion with a hosel bore defining a shaft axis and a shaft axis plane;   an adjustable head-shaft connection assembly coupled to the hosel portion and aligned with the lower opening, wherein the adjustable head-shaft connection assembly comprises a fastener received within a portion of the lower opening, and the adjustable head-shaft connection assembly is operable to releasably attach the golf club head to a golf club shaft and adjust at least one of a loft angle or a lie angle;   at least one aft-body component comprising a sole panel and a non-metal composite crown panel, wherein the sole panel and the non-metal composite crown panel are adhesively attached to the front body portion;   a forward weight attached to the front body portion, and the forward weight having a forward weight center of gravity;   a rear mass element attached to the golf club head and having a mass element center of gravity located at a mass element CGx coordinate, a mass element CGy coordinate, a mass element CGz coordinate, and a mass element Zup, wherein:
 the mass element CGy coordinate is 40-65% of the roll radius; 
 a front-rear weight separation distance is a distance from the mass element center of gravity to the forward weight center of gravity, and the front-rear weight separation distance is 30-65% of the roll radius; 
   the forward weight includes a heel forward weight and a toe forward weight, wherein:
 a face center vertical plane includes the y-axis and the z-axis, and divides a toe side of the golf club head located between the face center vertical plane and a toeward-most extent of the golf club head, and a heel side of the golf club head located between the face center vertical plane and a heelward-most extent of the golf club head; 
 the heel forward weight is located in the heel side and has a heel forward weight center of gravity located at a heel forward weight CGy coordinate and a heel forward weight Zup; 
 the toe forward weight is located in the toe side and has a toe forward weight center of gravity located at a toe forward weight CGy coordinate and a toe forward weight Zup; 
 the golf club head has a center of gravity having a club head Zup elevation above the ground plane; 
 a forward weight separation distance is measured from the heel forward weight center of gravity to the toe forward weight center of gravity, and the forward weight separation distance is 110-275% of the club head Zup elevation; 
 the heel forward weight CGy coordinate is 9.5-25% of the roll radius, and the toe forward weight CGy coordinate is 9.5-25% of the roll radius; and 
 the rear mass element is interchangeable with the heel forward weight and the toe forward weight; and 
 the golf club head has a club head mass of 180-210 grams and a volume of 390-500 cm 3 .