JP2023132963A - Wood type golf club head and manufacturing method for wood type golf club head - Google Patents

Wood type golf club head and manufacturing method for wood type golf club head Download PDF

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JP2023132963A
JP2023132963A JP2022038591A JP2022038591A JP2023132963A JP 2023132963 A JP2023132963 A JP 2023132963A JP 2022038591 A JP2022038591 A JP 2022038591A JP 2022038591 A JP2022038591 A JP 2022038591A JP 2023132963 A JP2023132963 A JP 2023132963A
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layer
golf club
club head
type golf
wood
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康晴 長井
Yasuharu Nagai
直樹 川口
Naoki Kawaguchi
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Yamaha Corp
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Yamaha Corp
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Priority to JP2022038591A priority Critical patent/JP2023132963A/en
Priority to KR1020230024699A priority patent/KR20230133767A/en
Priority to CN202320371834.8U priority patent/CN219595788U/en
Priority to CN202310193211.0A priority patent/CN116726462A/en
Publication of JP2023132963A publication Critical patent/JP2023132963A/en
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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Golf Clubs (AREA)

Abstract

To provide a wood type golf club head in which a desired portion of an outer shell body can be made lightweight and highly rigid.SOLUTION: A wood type golf club head 1 according to an embodiment of the present invention comprises a hollow head body 10 comprising an outer shell body 20 including a face part 2, a crown part 3, and a sole part 4. At least a portion of the outer shell body 20 is provided with a layered structure 30 comprising a first layer 11 and a second layer 12 arranged at an interval in a thickness direction, and a core layer 13 arranged between the first layer 11 and the second layer 12. The apparent density of the core layer 13 is lower than the apparent density of the first layer 11 and the second layer 12.SELECTED DRAWING: Figure 3

Description

本発明は、ウッド型ゴルフクラブヘッド及びウッド型ゴルフクラブヘッドの製造方法に関する。 The present invention relates to a wood-type golf club head and a method for manufacturing a wood-type golf club head.

中空のヘッド本体を有するウッド型ゴルフクラブヘッドには、軽量であることが望まれる。 A wood-type golf club head having a hollow head body is desired to be lightweight.

このような観点から、ヘッド本体の外殻体に繊維強化樹脂（ＦＲＰ）等を用いることが検討されている（特許文献１参照）。 From this viewpoint, the use of fiber reinforced resin (FRP) or the like for the outer shell of the head main body is being considered (see Patent Document 1).

特開２００５－５８６３４号公報Japanese Patent Application Publication No. 2005-58634 特開昭６３－２６４０８５号公報Japanese Unexamined Patent Publication No. 63-264085

特許文献１には、炭素繊維をエポキシ樹脂に分散させたプリプレグを多層に積層したプレート部品をクラウン部に用いることが記載されている。しかしながら、この構成によると、必要とされる剛性を得るためにはプリプレグの枚数を多くすることを要するため、軽量化を促進する観点で課題を有する。 Patent Document 1 describes that a plate component in which prepregs in which carbon fibers are dispersed in epoxy resin are laminated in multiple layers is used for the crown portion. However, according to this configuration, it is necessary to increase the number of prepreg sheets in order to obtain the required rigidity, so there is a problem in terms of promoting weight reduction.

なお、特許文献２には、中空ヘッドにおいて、ヘッド内部にソール面から上面に、又は上面からソール面に延びる壁部を設け、ハニカム構造の中空室を形成することが記載されている。特許文献２には、ハニカム構造の中空室を設けることで、ヘッド全体を強化できることが記載されている。しかしながら、特許文献２に記載されている構成によっては、ヘッド本体の外殻体の所望の部分に適切な重量で所望の剛性を付与することはできない。 Note that Patent Document 2 describes that in a hollow head, a wall portion extending from the sole surface to the upper surface or from the upper surface to the sole surface is provided inside the head to form a hollow chamber having a honeycomb structure. Patent Document 2 describes that the entire head can be strengthened by providing a hollow chamber with a honeycomb structure. However, depending on the configuration described in Patent Document 2, it is not possible to impart desired rigidity to a desired portion of the outer shell of the head main body with an appropriate weight.

本発明は、このような事情に基づいてなされたものであり、本発明の目的は、外殻体の所望の部分について、軽量化かつ高剛性化を図ることができるウッド型ゴルフクラブヘッドを提供することにある。 The present invention has been made based on these circumstances, and an object of the present invention is to provide a wood-type golf club head that can reduce the weight and increase the rigidity of desired portions of the outer shell. It's about doing.

本発明の一態様に係るウッド型ゴルフクラブヘッドは、フェース部、クラウン部及びソール部を含む外殻体を有する中空のヘッド本体を備え、前記外殻体の少なくとも一部に、厚さ方向に間隔を空けて配置される第１層及び第２層と、前記第１層及び前記第２層の間に配置される中芯層とを有する積層構造が設けられており、前記中芯層の見掛け密度が、前記第１層及び前記第２層の見掛け密度よりも小さい。 A wood-type golf club head according to one aspect of the present invention includes a hollow head body having an outer shell including a face portion, a crown portion, and a sole portion, and includes a hollow head body having at least a portion of the outer shell in a thickness direction. A laminated structure is provided that has a first layer and a second layer arranged at intervals, and a core layer arranged between the first layer and the second layer. The apparent density is smaller than the apparent density of the first layer and the second layer.

前記第１層及び前記第２層が、それぞれ繊維強化樹脂層であるとよい。 The first layer and the second layer may each be a fiber reinforced resin layer.

前記中芯層が多孔質であるとよい。 It is preferable that the core layer is porous.

前記中芯層が、厚さ方向に貫通する複数の貫通孔を有するとよい。 It is preferable that the core layer has a plurality of through holes penetrating in the thickness direction.

前記中芯層が、発泡樹脂又はハニカムコアを含むとよい。 The core layer preferably includes a foamed resin or a honeycomb core.

前記積層構造の平均厚さに対する前記中芯層の平均厚さの比としては、０．４以上０．９以下が好ましい。 The ratio of the average thickness of the core layer to the average thickness of the laminated structure is preferably 0.4 or more and 0.9 or less.

前記中芯層の見掛け密度としては、１０ｋｇ／ｍ３以上２００ｋｇ／ｍ３以下が好ましい。 The apparent density of the core layer is preferably 10 kg/m 3 or more and 200 kg/m 3 or less.

前記積層構造が前記クラウン部に配置されているとよい。 It is preferable that the laminated structure is arranged in the crown portion.

本発明の別の一態様に係るウッド型ゴルフクラブヘッドの製造方法は、フェース部、クラウン部及びソール部を含む外殻体を有する中空のヘッド本体を備え、前記外殻体の少なくとも一部に積層構造が設けられているウッド型ゴルフクラブヘッドの製造方法であって、厚さ方向に間隔を空けて配置される第１層及び第２層の間に、接着剤を介して、前記第１層及び前記第２層よりも見掛け密度の小さい中芯層を配置し、前記第１層及び前記第２層に挟み込み圧力を加え、前記第１層及び前記第２層を前記接着剤によって前記中芯層と接着する。 A method for manufacturing a wood-type golf club head according to another aspect of the present invention includes a hollow head body having an outer shell including a face portion, a crown portion, and a sole portion, and at least a portion of the outer shell. A method for manufacturing a wood-type golf club head provided with a laminated structure, wherein the first layer and the second layer are spaced apart from each other in the thickness direction by using an adhesive. A core layer having an apparent density lower than that of the first layer and the second layer is placed, sandwiching pressure is applied to the first layer and the second layer, and the first layer and the second layer are bonded to the core layer with the adhesive. Adheres to the core layer.

なお、本発明において、「見掛け密度」とは、ＪＩＳ Ｋ７２２２：２００５に準拠して測定される値を意味する。「平均厚さ」とは、任意の１０点の厚さの平均値を意味する。なお、この「平均厚さ」について、測定対象に部分的な凹凸等が存在している場合には、この凹凸等を有しない部分における任意の１０点の厚さの平均値を意味する。 In the present invention, "apparent density" means a value measured in accordance with JIS K7222:2005. "Average thickness" means the average value of thicknesses at arbitrary 10 points. Note that this "average thickness" means the average value of the thickness at arbitrary 10 points in a portion that does not have unevenness or the like in a case where the measurement target has local unevenness or the like.

本発明の一態様に係るウッド型ゴルフクラブヘッドは、前記外殻体の少なくとも一部に、前記第１層と前記第２層とで前記中芯層を挟み込んで形成された積層構造が設けられているので、この積層構造によって外殻体の所望の部分の軽量化及び高剛性化を図ることができる。つまり、当該ウッド型ゴルフクラブヘッドは、前記中芯層の見掛け密度が、前記第１層及び前記第２層の見掛け密度よりも小さいので、前記中芯層の厚さを比較的大きくしても、前記積層構造全体としての軽量化を図ることができる。また、前記中芯層を、前記第１層及び前記第２層で挟み込むことで、前記積層構造の剛性を高めることができる。その結果、当該ウッド型ゴルフクラブヘッドは、例えば均質な層構造を有する従来の構成を用いる場合と比較して、前記外殻体の所望の部分について、軽量化かつ高剛性化を図ることができる。 In the wood-type golf club head according to one aspect of the present invention, at least a portion of the outer shell body is provided with a laminated structure formed by sandwiching the core layer between the first layer and the second layer. Therefore, this laminated structure makes it possible to reduce the weight and increase the rigidity of desired portions of the outer shell. In other words, in the wood type golf club head, since the apparent density of the core layer is smaller than the apparent density of the first layer and the second layer, even if the thickness of the core layer is relatively large, , it is possible to reduce the weight of the entire laminated structure. Further, by sandwiching the core layer between the first layer and the second layer, the rigidity of the laminated structure can be increased. As a result, the wood-type golf club head can be made lighter and more rigid in desired portions of the outer shell, compared to, for example, a conventional structure having a homogeneous layer structure. .

図１は、本発明の一実施形態に係るウッド型ゴルフクラブヘッドの模式的正面図である。FIG. 1 is a schematic front view of a wood-type golf club head according to an embodiment of the present invention. 図２は、図１のウッド型ゴルフクラブヘッドの模式的平面図である。FIG. 2 is a schematic plan view of the wood-type golf club head of FIG. 1. FIG. 図３は、図１のウッド型ゴルフクラブヘッドのクラウン部を厚さ方向に切断した模式的断面図である。FIG. 3 is a schematic cross-sectional view of the crown portion of the wood-type golf club head of FIG. 1 cut in the thickness direction. 図４は、図３のＩＶ－ＩＶ線断面図である。FIG. 4 is a cross-sectional view taken along the line IV--IV in FIG. 図５は、本発明の一実施形態に係るウッド型ゴルフクラブヘッドの製造方法を示すフロー図である。FIG. 5 is a flow diagram showing a method for manufacturing a wood-type golf club head according to an embodiment of the present invention.

以下、適宜図面を参照しつつ、本発明の実施の形態を詳説する。なお、本明細書に記載された数値については、記載された上限値と下限値との一方のみを採用すること、或いは上限値と下限値を任意に組み合わせることが可能である。本明細書では、組み合わせ可能な数値範囲が好適な範囲として全て記載されているものとする。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings as appropriate. In addition, regarding the numerical values described in this specification, it is possible to employ only one of the described upper limit value and lower limit value, or to arbitrarily combine the upper limit value and the lower limit value. In this specification, all combinable numerical ranges are described as suitable ranges.

＜ウッド型ゴルフクラブヘッド＞
図１及び図２のウッド型ゴルフクラブヘッド１は、中空のヘッド本体１０を備える。ヘッド本体１０は、フェース部２、クラウン部３及びソール部４を含む外殻体２０を有する。当該ウッド型ゴルフクラブヘッド１は、例えばドライバ、ユーティリティ、フェアウェイウッド等として用いられる。中でも、当該ウッド型ゴルフクラブヘッド１は、ドライバとして好ましく用いられる。 <Wood type golf club head>
The wood-type golf club head 1 shown in FIGS. 1 and 2 includes a hollow head body 10. As shown in FIG. The head body 10 has an outer shell 20 including a face portion 2, a crown portion 3, and a sole portion 4. The wood-type golf club head 1 is used, for example, as a driver, utility, fairway wood, etc. Among these, the wood type golf club head 1 is preferably used as a driver.

図３に示すように、外殻体２０の少なくとも一部には、厚さ方向に間隔を空けて配置される第１層１１及び第２層１２と、第１層１１及び第２層１２の間に配置される中芯層１３とを有する積層構造３０が設けられている。中芯層１３の見掛け密度は、第１層１１及び第２層１２の見掛け密度よりも小さい。なお、当該ウッド型ゴルフクラブヘッド１においては、積層構造３０以外の部分の具体的な構成は特に限定されない。例えば外殻体２０における積層構造３０以外の部分の材質としては、特に限定されるものではなく、例えばチタン、ステンレス鋼、マレージング鋼、アルミニウム、マグネシウム等を主成分とする金属及び合金を用いることができる。なお、「主成分」とは、質量換算で最も含有量の大きい成分を意味しており、例えば含有量が５０質量％以上の成分を意味する。 As shown in FIG. 3, at least a portion of the outer shell 20 includes a first layer 11 and a second layer 12, which are spaced apart in the thickness direction. A laminated structure 30 having a core layer 13 disposed therebetween is provided. The apparent density of the core layer 13 is smaller than the apparent density of the first layer 11 and the second layer 12. Note that in the wood-type golf club head 1, the specific structure of the portions other than the laminated structure 30 is not particularly limited. For example, the material of the parts of the outer shell 20 other than the laminated structure 30 is not particularly limited, and for example, metals and alloys whose main components are titanium, stainless steel, maraging steel, aluminum, magnesium, etc. can be used. can. Note that the term "main component" refers to a component with the largest content in terms of mass, and for example, a component with a content of 50% by mass or more.

（積層構造）
図３を参照しつつ、積層構造３０について詳説する。積層構造３０は、第１層１１、中芯層１３及び第２層１２が外殻体２０の外面側から内面側に向けてこの順で積層された３層構造体である。本実施形態において、第１層１１は外殻体２０の外面を構成し、第２層１２は外殻体２０の内面を構成している。 (Laminated structure)
The laminated structure 30 will be explained in detail with reference to FIG. 3. The laminated structure 30 is a three-layer structure in which the first layer 11, the core layer 13, and the second layer 12 are laminated in this order from the outer surface side to the inner surface side of the outer shell 20. In this embodiment, the first layer 11 constitutes the outer surface of the outer shell 20, and the second layer 12 constitutes the inner surface of the outer shell 20.

積層構造３０は、外殻体２０の一部を構成している。積層構造３０は、外殻体２０の任意の位置に配置可能であり、例えばフェース部２、ソール部４等に配置してもよい。中でも、積層構造３０は、クラウン部３に配置されることが好ましい。クラウン部３には、ゴルフのルール上、堅牢であることが求められる一方で、ヘッド本体１０の低重心化等の要請から、軽量であることが望まれる。この点において、当該ウッド型ゴルフクラブヘッド１は、積層構造３０がクラウン部３に配置されることで、クラウン部３の押し圧力に対する剛性を高めて堅牢性を確保すると共に、クラウン部３の軽量化を図ることができる。 The laminated structure 30 constitutes a part of the outer shell 20. The laminated structure 30 can be placed at any position on the outer shell 20, for example, on the face portion 2, sole portion 4, etc. Among these, it is preferable that the laminated structure 30 is arranged in the crown part 3. The crown portion 3 is required to be strong according to the rules of golf, but is also desired to be lightweight in order to lower the center of gravity of the head body 10. In this respect, the wood-type golf club head 1 has the laminated structure 30 disposed in the crown part 3, thereby increasing the rigidity of the crown part 3 against pressing force and ensuring robustness, and also making the crown part 3 lightweight. It is possible to aim for

図２に示すように、当該ウッド型ゴルフクラブヘッド１は、クラウン部３に蓋体３ａが配置されている。この蓋体３ａは、図３の積層構造３０を有している。クラウン部３に占める蓋体３ａの割合（つまり、クラウン部３に占める積層構造３０の割合）としては、特に限定されるものではないが、例えば５０体積％以上とすることができ、７０体積％以上が好ましい。 As shown in FIG. 2, the wood-type golf club head 1 has a lid 3a disposed on the crown portion 3. As shown in FIG. This lid body 3a has a laminated structure 30 shown in FIG. The proportion of the lid body 3a in the crown part 3 (that is, the proportion of the laminated structure 30 in the crown part 3) is not particularly limited, but can be, for example, 50 volume% or more, and 70 volume%. The above is preferable.

〔第１層〕
第１層１１としては、例えば繊維強化樹脂層や、チタン、ステンレス鋼、マレージング鋼、アルミニウム、マグネシウム等の金属又は合金を主成分とする金属層が挙げられる。中でも、第１層１１としては、積層構造３０の軽量化と高剛性化とを図りやすい観点から、繊維強化樹脂層が好ましい。第１層１１が繊維強化樹脂層（第１繊維強化樹脂層）である場合、第１層１１は、第１樹脂マトリックスと、この第１樹脂マトリックス中に分散する第１繊維とを有する。第１層１１は、例えば前記第１繊維が前記第１樹脂マトリックス中に分散した複数のプリプレグの積層体である。 [First layer]
Examples of the first layer 11 include a fiber-reinforced resin layer and a metal layer whose main component is a metal or alloy such as titanium, stainless steel, maraging steel, aluminum, or magnesium. Among these, a fiber-reinforced resin layer is preferable as the first layer 11 from the viewpoint of easily achieving weight reduction and high rigidity of the laminated structure 30. When the first layer 11 is a fiber-reinforced resin layer (first fiber-reinforced resin layer), the first layer 11 includes a first resin matrix and first fibers dispersed in the first resin matrix. The first layer 11 is, for example, a laminate of a plurality of prepregs in which the first fibers are dispersed in the first resin matrix.

前記第１繊維としては、炭素繊維、ガラス繊維等の無機繊維、アラミド繊維、ポリパラフェニレンベンズビスオキサゾール繊維（ＰＢＯ繊維）等の有機繊維が挙げられる。前記第１樹脂マトリックスの主成分としては、例えばエポキシ樹脂、不飽和ポリエステル等の熱硬化性樹脂や、ポリオレフィン、ポリアミド等の熱可塑性樹脂が挙げられる。前記第１繊維が炭素繊維の場合には、第１層１１は、炭素繊維強化樹脂層（ＣＦＲＰ層）として構成される。前記第１繊維がガラス繊維である場合、第１層１１は、ガラス繊維強化樹脂層（ＧＦＲＰ層）として構成される。 Examples of the first fibers include inorganic fibers such as carbon fibers and glass fibers, and organic fibers such as aramid fibers and polyparaphenylenebenzbisoxazole fibers (PBO fibers). Examples of the main components of the first resin matrix include thermosetting resins such as epoxy resins and unsaturated polyesters, and thermoplastic resins such as polyolefins and polyamides. When the first fibers are carbon fibers, the first layer 11 is configured as a carbon fiber reinforced resin layer (CFRP layer). When the first fibers are glass fibers, the first layer 11 is configured as a glass fiber reinforced resin layer (GFRP layer).

第１層１１は、炭素繊維強化樹脂層（ＣＦＲＰ層）であることが好ましい。この構成によると、積層構造３０の軽量化と高剛性化とを容易に促進しやすい。 The first layer 11 is preferably a carbon fiber reinforced resin layer (CFRP layer). According to this configuration, it is easy to promote weight reduction and high rigidity of the laminated structure 30.

第１層１１の見掛け密度としては、例えば８００ｋｇ／ｍ３以上４５００ｋｇ／ｍ３以下とすることができる。 The apparent density of the first layer 11 can be, for example, 800 kg/m 3 or more and 4500 kg/m 3 or less.

〔第２層〕
第２層１２としては、例えば繊維強化樹脂層や、チタン、ステンレス鋼、マレージング鋼、アルミニウム、マグネシウム等の金属又は合金を主成分とする金属層が挙げられる。中でも、第２層１２としては、積層構造３０の軽量化と高剛性化とを図りやすい観点から、繊維強化樹脂層が好ましい。第２層１２が繊維強化樹脂層（第２繊維強化樹脂層）である場合、第２層１２は、第２樹脂マトリックスと、この第２樹脂マトリックス中に分散する第２繊維とを有する。第２層１２は、例えば前記第２繊維が前記第２樹脂マトリックス中に分散した複数のプリプレグの積層体である。 [Second layer]
Examples of the second layer 12 include a fiber-reinforced resin layer and a metal layer whose main component is a metal or alloy such as titanium, stainless steel, maraging steel, aluminum, or magnesium. Among these, a fiber-reinforced resin layer is preferable as the second layer 12 from the viewpoint of easily achieving weight reduction and high rigidity of the laminated structure 30. When the second layer 12 is a fiber-reinforced resin layer (second fiber-reinforced resin layer), the second layer 12 includes a second resin matrix and second fibers dispersed in the second resin matrix. The second layer 12 is, for example, a laminate of a plurality of prepregs in which the second fibers are dispersed in the second resin matrix.

前記第２繊維としては、前記第１繊維と同様に、炭素繊維、ガラス繊維、アラミド繊維、ポリパラフェニレンベンズビスオキサゾール繊維（ＰＢＯ繊維）等を用いることができる。前記第２樹脂マトリックスの主成分としては、前記第１樹脂マトリックスと同様に、エポキシ樹脂、不飽和ポリエステル等の熱硬化性樹脂や、ポリオレフィン、ポリアミド等の熱可塑性樹脂を用いることができる。 As the second fibers, carbon fibers, glass fibers, aramid fibers, polyparaphenylenebenzbisoxazole fibers (PBO fibers), etc. can be used as in the first fibers. As the main component of the second resin matrix, similarly to the first resin matrix, thermosetting resins such as epoxy resins and unsaturated polyesters, and thermoplastic resins such as polyolefins and polyamides can be used.

前記第２繊維の種類は、前記第１繊維と同じであってもよく、異なっていてもよい。また、前記第２樹脂マトリックスの主成分は、前記第１樹脂マトリックスの主成分と同じであってもよく、異なっていてもよい。但し、第２層１２としては、炭素繊維強化樹脂層（ＣＦＲＰ層）であることが好ましく、第１層１１及び第２層１２の両方が炭素繊維強化樹脂層（ＣＦＲＰ層）であることがより好ましい。この構成によると、積層構造３０の軽量化と高剛性化とを容易に促進しやすい。 The type of the second fiber may be the same as or different from the first fiber. Further, the main component of the second resin matrix may be the same as or different from the main component of the first resin matrix. However, the second layer 12 is preferably a carbon fiber reinforced resin layer (CFRP layer), and it is more preferable that both the first layer 11 and the second layer 12 are carbon fiber reinforced resin layers (CFRP layer). preferable. According to this configuration, it is easy to promote weight reduction and high rigidity of the laminated structure 30.

第２層１２の見掛け密度としては、例えば８００ｋｇ／ｍ３以上４５００ｋｇ／ｍ３以下とすることができる。 The apparent density of the second layer 12 can be, for example, 800 kg/m 3 or more and 4500 kg/m 3 or less.

第１層１１の平均厚さと第２層１２の平均厚さとは異なっていてもよい。この場合、外力に対する強度の観点から、第１層１１の平均厚さが第２層１２の平均厚さよりも大きい方が好ましい。また、積層構造３０の形状の安定化等の観点からは、第１層１１の平均厚さと第２層１２の平均厚さとは近似していることが好ましい。第１層１１の平均厚さに対する第２層１２の平均厚さの比としては、例えば０．８以上１．２以下が好ましく、０．９以上１．１以下がより好ましく、１．０がさらに好ましい。 The average thickness of the first layer 11 and the average thickness of the second layer 12 may be different. In this case, from the viewpoint of strength against external forces, it is preferable that the average thickness of the first layer 11 is larger than the average thickness of the second layer 12. Further, from the viewpoint of stabilizing the shape of the laminated structure 30, it is preferable that the average thickness of the first layer 11 and the average thickness of the second layer 12 are similar. The ratio of the average thickness of the second layer 12 to the average thickness of the first layer 11 is, for example, preferably 0.8 or more and 1.2 or less, more preferably 0.9 or more and 1.1 or less, and 1.0. More preferred.

〔中芯層〕
中芯層１３は、第１層１１及び第２層１２と接着剤によって接着されている。つまり、中芯層１３は、第１層１１及び第２層１２と直接的に積層されている。 [Middle core layer]
The core layer 13 is bonded to the first layer 11 and the second layer 12 with an adhesive. That is, the core layer 13 is directly laminated with the first layer 11 and the second layer 12.

中芯層１３の材質としては、例えば木材、合成樹脂、金属、繊維等が挙げられる。中芯層１３は、単一の材質から構成されてもよく、例えば合成樹脂中に繊維を含浸させる等によって２種以上の材質を含んで構成されてもよい。 Examples of the material for the core layer 13 include wood, synthetic resin, metal, and fiber. The core layer 13 may be made of a single material, or may be made of two or more materials, for example, by impregnating fibers into a synthetic resin.

中芯層１３は、積層構造３０の軽量化及び高剛性化を図れるように、第１層１１及び第２層１２の間に配置される。そのため、中芯層１３には、それ自体が軽量であること、及び第１層１１と第２層１２とに挟まれることで積層構造３０の剛性を高めることができることが求められる。 The core layer 13 is arranged between the first layer 11 and the second layer 12 so that the laminated structure 30 can be made lighter and more rigid. Therefore, the core layer 13 is required to be lightweight in itself and to be able to increase the rigidity of the laminated structure 30 by being sandwiched between the first layer 11 and the second layer 12.

中芯層１３は、多孔質であることが好ましい。中芯層１３がこのように構成されることで、積層構造３０の軽量化を促進できる。また、中芯層１３の軽量化が図られることで、中芯層１３の厚さを大きくしやすくなる。その結果、積層構造３０の剛性をより高めることができる。 The core layer 13 is preferably porous. By configuring the core layer 13 in this way, it is possible to promote weight reduction of the laminated structure 30. Further, by reducing the weight of the core layer 13, it becomes easier to increase the thickness of the core layer 13. As a result, the rigidity of the laminated structure 30 can be further increased.

中芯層１３が多孔質である場合、図４に示すように、この中芯層１３は、厚さ方向に貫通する複数の貫通孔１３ａを有することが好ましい。この構成によると、中芯層１３の曲げ剛性を容易に高めることができる。また、貫通孔１３ａが厚さ方向に貫通していることで、中芯層１３の見掛け密度を小さくしやすい。その結果、積層構造３０の軽量化と高剛性化とを共に促進することができる。 When the core layer 13 is porous, as shown in FIG. 4, it is preferable that the core layer 13 has a plurality of through holes 13a penetrating in the thickness direction. According to this configuration, the bending rigidity of the core layer 13 can be easily increased. Furthermore, since the through holes 13a penetrate in the thickness direction, the apparent density of the core layer 13 can be easily reduced. As a result, it is possible to both reduce the weight and increase the rigidity of the laminated structure 30.

中芯層１３が多孔質である場合、この中芯層１３は、貫通孔１３ａによって画定される柱構造１３ｂを有することが好ましい。柱構造１３ｂは、中芯層１３の厚さ方向の両端に亘って延びることで、第１層１１と第２層１２との間隔を維持するための支え（スペーサ）となる。柱構造１３ｂは、１つの中実体に複数の貫通孔１３ａが形成されることで設けられる。中芯層１３は、柱構造１３ｂを有することで、曲げ剛性を容易に高めることができる。また、この構成によると、中芯層１３の見掛け密度を小さくしやすい。その結果、積層構造３０の軽量化と高剛性化とを共に促進することができる。 When the core layer 13 is porous, it is preferable that the core layer 13 has a columnar structure 13b defined by the through holes 13a. The columnar structure 13b extends across both ends of the core layer 13 in the thickness direction, thereby serving as a support (spacer) for maintaining the distance between the first layer 11 and the second layer 12. The column structure 13b is provided by forming a plurality of through holes 13a in one solid body. By having the columnar structure 13b, the core layer 13 can easily increase its bending rigidity. Moreover, according to this configuration, the apparent density of the core layer 13 can be easily reduced. As a result, it is possible to both reduce the weight and increase the rigidity of the laminated structure 30.

中芯層１３が多孔質である場合、この中芯層１３は、発泡樹脂又はハニカムコアを含むことが好ましい（図４では、中芯層１３がハニカムコアからなる構成について図示している）。この構成によると、積層構造３０の軽量化と高剛性化とを図りやすい。 When the core layer 13 is porous, it is preferable that the core layer 13 includes a foamed resin or a honeycomb core (FIG. 4 shows a structure in which the core layer 13 is made of a honeycomb core). According to this configuration, it is easy to reduce the weight and increase the rigidity of the laminated structure 30.

中芯層１３が発泡樹脂を含む場合、この発泡樹脂の主成分としては、特に限定されるものではないが、例えばポリメタクリルイミド、硬質ウレタン樹脂、フェノール樹脂、ユリア樹脂、シリコーン樹脂、エポキシ樹脂等が挙げられる。中でも、優れた耐熱性を有することで積層構造３０の形成が容易であると共に、軽量化及び高剛性化を図りやすいポリメタクリルイミドが好ましい。 When the core layer 13 contains a foamed resin, the main components of the foamed resin are not particularly limited, but include, for example, polymethacrylimide, hard urethane resin, phenol resin, urea resin, silicone resin, epoxy resin, etc. can be mentioned. Among these, polymethacrylimide is preferable because it has excellent heat resistance, which makes it easy to form the laminated structure 30, and also makes it easy to reduce weight and increase rigidity.

中芯層１３がハニカムコアを含む場合、このハニカムコアとしては、アルミハニカム、アラミドハニカム、ペーパーハニカム等が挙げられる。中芯層１３がハニカムコアを含む場合、このハニカムコアは前述の柱構造１３ｂとして構成される。この構成によると、積層構造３０の軽量化と高剛性化とを容易かつ確実に図ることができる。また、中芯層１３がハニカムコアを含むことで、後述するように、第１層１１及び第２層１２が湾曲している場合でも、この湾曲形状に追随して中芯層１３を配置しやすい。 When the core layer 13 includes a honeycomb core, examples of the honeycomb core include aluminum honeycomb, aramid honeycomb, paper honeycomb, and the like. When the core layer 13 includes a honeycomb core, this honeycomb core is configured as the columnar structure 13b described above. According to this configuration, it is possible to easily and reliably reduce the weight and increase the rigidity of the laminated structure 30. Furthermore, since the core layer 13 includes the honeycomb core, even if the first layer 11 and the second layer 12 are curved, the core layer 13 can be arranged to follow the curved shape, as will be described later. Cheap.

中芯層１３の平均厚さＴ１（図３参照）の下限としては、０．４ｍｍが好ましく、０．５ｍｍがより好ましい。一方、中芯層１３の平均厚さＴ１の上限としては、３．０ｍｍが好ましく、２．５ｍｍがより好ましく、２．０ｍｍがさらに好ましい。前記平均厚さＴ１が前記下限に満たないと、積層構造３０の剛性を十分に高めることができないおそれがある。逆に、前記平均厚さＴ１が前記上限を超えると、積層構造３０の軽量化を十分に図り難くなるおそれがある。 The lower limit of the average thickness T1 (see FIG. 3) of the core layer 13 is preferably 0.4 mm, more preferably 0.5 mm. On the other hand, the upper limit of the average thickness T1 of the core layer 13 is preferably 3.0 mm, more preferably 2.5 mm, and even more preferably 2.0 mm. If the average thickness T1 is less than the lower limit, the rigidity of the laminated structure 30 may not be sufficiently increased. Conversely, if the average thickness T1 exceeds the upper limit, it may be difficult to sufficiently reduce the weight of the laminated structure 30.

積層構造３０の平均厚さＴに対する中芯層１３の平均厚さＴ１の比（Ｔ１／Ｔ）の下限としては、０．４が好ましく、０．５がより好ましく、０．６がさらに好ましい。一方、前記比（Ｔ１／Ｔ）の上限としては、０．９が好ましく、０．８がより好ましい。前記比（Ｔ１／Ｔ）が前記下限に満たないと、中芯層１３の厚さが不十分となり、積層構造３０の剛性が十分に得られないおそれや、第１層１１及び第２層１２の合計厚さが大きくなり過ぎて、積層構造３０の軽量化を図り難くなるおそれがある。逆に、前記比（Ｔ１／Ｔ）が前記上限を超えると、中芯層１３の厚さが大きくなり過ぎて、積層構造３０の軽量化を図り難くなるおそれや、第１層１１及び第２層１２で中芯層１３を両側から十分に補強し難くなるおそれがある。 The lower limit of the ratio (T1/T) of the average thickness T1 of the core layer 13 to the average thickness T of the laminated structure 30 is preferably 0.4, more preferably 0.5, and even more preferably 0.6. On the other hand, the upper limit of the ratio (T1/T) is preferably 0.9, more preferably 0.8. If the ratio (T1/T) is less than the lower limit, the thickness of the core layer 13 will be insufficient, and there is a possibility that the laminated structure 30 will not have sufficient rigidity, and the first layer 11 and the second layer 12 will be insufficiently thick. If the total thickness of the laminated structure 30 becomes too large, it may be difficult to reduce the weight of the laminated structure 30. On the other hand, if the ratio (T1/T) exceeds the upper limit, the thickness of the core layer 13 becomes too large, which may make it difficult to reduce the weight of the laminated structure 30, or There is a possibility that it will be difficult to sufficiently reinforce the core layer 13 from both sides with the layer 12.

中芯層１３の見掛け密度の下限としては、１０ｋｇ／ｍ３が好ましく、２０ｋｇ／ｍ３がより好ましい。一方、中芯層１３の見掛け密度の上限としては、２００ｋｇ／ｍ３が好ましく、１５０ｋｇ／ｍ３がより好ましく、１００ｋｇ／ｍ３がさらに好ましい。前記見掛け密度が前記下限に満たないと、積層構造３０の剛性が不十分となるおそれがある。逆に、前記見掛け密度が前記上限を超えると、積層構造３０の軽量化を十分に図り難くなるおそれがある。 The lower limit of the apparent density of the core layer 13 is preferably 10 kg/m 3 , more preferably 20 kg/m 3 . On the other hand, the upper limit of the apparent density of the core layer 13 is preferably 200 kg/m 3 , more preferably 150 kg/m 3 , and even more preferably 100 kg/m 3 . If the apparent density is less than the lower limit, the rigidity of the laminated structure 30 may be insufficient. On the other hand, if the apparent density exceeds the upper limit, it may be difficult to sufficiently reduce the weight of the laminated structure 30.

第１層１１及び第２層１２がいずれも炭素繊維強化樹脂層（ＣＦＲＰ層）である場合、第１層１１及び第２層１２の見掛け密度に対する中芯層１３の見掛け密度の比の下限としては、０．０１が好ましく、０．０２がより好ましい。一方、前記比の上限としては、０．１０が好ましく、０．０５がより好ましく、０．０４がさらに好ましい。前記比を前記範囲内とすることで、積層構造３０の軽量化及び高剛性化を促進しやすい。 When both the first layer 11 and the second layer 12 are carbon fiber reinforced resin layers (CFRP layers), the lower limit of the ratio of the apparent density of the core layer 13 to the apparent density of the first layer 11 and the second layer 12 is is preferably 0.01, more preferably 0.02. On the other hand, the upper limit of the ratio is preferably 0.10, more preferably 0.05, and even more preferably 0.04. By setting the ratio within the range, it is easy to promote weight reduction and high rigidity of the laminated structure 30.

＜ウッド型ゴルフクラブヘッドの製造方法＞
図５を参照して、当該ウッド型ゴルフクラブヘッド１の製造方法の一例について説明する。当該ウッド型ゴルフクラブヘッドの製造方法（以下、単に「当該製造方法」ともいう。）は、フェース部２、クラウン部３及びソール部４を含む外殻体２０を有する中空のヘッド本体１０を備え、外殻体２０の少なくとも一部に積層構造３０が設けられているウッド型ゴルフクラブヘッド１の製造方法として用いられる。当該製造方法は、厚さ方向に間隔を空けて配置される第１層１１及び第２層１２の間に、接着剤を介して、第１層１１及び第２層１２よりも見掛け密度の小さい中芯層１３を配置し（Ｓ１）、第１層１１及び第２層１２に挟み込み圧力を加え（Ｓ２）、第１層１１及び第２層１２を前記接着剤によって中芯層１３と接着する（Ｓ３）。 <Method for manufacturing wood type golf club head>
An example of a method for manufacturing the wood-type golf club head 1 will be described with reference to FIG. 5. The wood-type golf club head manufacturing method (hereinafter also simply referred to as "the manufacturing method") includes a hollow head body 10 having an outer shell 20 including a face portion 2, a crown portion 3, and a sole portion 4. , is used as a method for manufacturing a wood-type golf club head 1 in which the laminated structure 30 is provided on at least a portion of the outer shell 20. In this manufacturing method, a layer having an apparent density lower than that of the first layer 11 and the second layer 12 is formed by using an adhesive between the first layer 11 and the second layer 12 which are spaced apart from each other in the thickness direction. Arranging the core layer 13 (S1), applying sandwiching pressure to the first layer 11 and the second layer 12 (S2), and bonding the first layer 11 and the second layer 12 to the core layer 13 using the adhesive. (S3).

（Ｓ１）
Ｓ１では、例えば第１層１１及び第２層１２を、それぞれ金型を用いて成形する。さらに、Ｓ１では、第１層１１及び第２層１２の対向面（中芯層１３と積層される側の面）を表面処理する。前記表面処理の具体的な手段としては、例えばサンドブラスト法、ピールプライ法（ピールプライクロスを貼り付けておき、硬化後に剥がす方法）等が挙げられる。この表面処理は、例えば前記対向面を粗面化し、接着剤の濡れ性を高めるために行う。なお、第１層１１及び第２層１２の対向面に前記接着剤を塗布するうえで支障のない場合には、前記表面処理は省略することも可能である。 (S1)
In S1, for example, the first layer 11 and the second layer 12 are each molded using a mold. Furthermore, in S1, the opposing surfaces of the first layer 11 and the second layer 12 (the surface on the side laminated with the core layer 13) are surface-treated. Specific means for the surface treatment include, for example, a sandblasting method, a peel ply method (a method in which a peel ply cloth is attached and then peeled off after hardening). This surface treatment is performed, for example, to roughen the facing surface and improve wettability of the adhesive. Note that the surface treatment may be omitted if there is no problem in applying the adhesive to the opposing surfaces of the first layer 11 and the second layer 12.

続いて、Ｓ１では、第１層１１及び第２層１２の対向面にそれぞれ前記接着剤を塗布する。この接着剤としては、例えばエポキシ樹脂、アクリル樹脂、ポリウレタン等の熱硬化性樹脂を含むものを用いることができる。 Subsequently, in S1, the adhesive is applied to opposing surfaces of the first layer 11 and the second layer 12, respectively. As this adhesive, for example, one containing a thermosetting resin such as epoxy resin, acrylic resin, polyurethane, etc. can be used.

次に、Ｓ１では、それぞれ前記接着剤が塗布された第１層１１及び第２層１２の対向面間に、中芯層１３を配置する。この際、中芯層１３として、ハニカムコアを含むものを用いることで、第１層１１及び第２層１２の対向面が湾曲している場合でも、中芯層１３を第１層１１及び第２層１２の湾曲形状に追随して湾曲させやすい。 Next, in S1, a core layer 13 is placed between the opposing surfaces of the first layer 11 and the second layer 12, each coated with the adhesive. At this time, by using a material containing a honeycomb core as the core layer 13, even if the facing surfaces of the first layer 11 and the second layer 12 are curved, the core layer 13 can be It is easy to curve following the curved shape of the second layer 12.

（Ｓ２）
Ｓ２では、第１層１１及び第２層１２の対向面間に、前記接着剤を介して中芯層１３が配置された状態で、第１層１１及び第２層１２に挟み込み圧力を加える。Ｓ２による挟み込みは、例えば外殻体２０の形状に対応した型を用いて行うことができる。 (S2)
In S2, sandwiching pressure is applied to the first layer 11 and the second layer 12 with the core layer 13 disposed between the opposing surfaces of the first layer 11 and the second layer 12 via the adhesive. The pinching by S2 can be performed using, for example, a mold corresponding to the shape of the outer shell 20.

（Ｓ３）
Ｓ３は、Ｓ２と同時に行ってもよく、Ｓ２の後に行ってもよい。前記接着剤が熱硬化性樹脂を含む場合、Ｓ３では、前記接着剤を加熱することで、第１層１１及び第２層１２と中芯層１３とを接着する。Ｓ３による接着によって積層構造３０が形成される。 (S3)
S3 may be performed simultaneously with S2 or after S2. When the adhesive includes a thermosetting resin, in S3, the first layer 11 and the second layer 12 are bonded to the core layer 13 by heating the adhesive. A laminated structure 30 is formed by adhesion using S3.

＜利点＞
当該ウッド型ゴルフクラブヘッド１は、外殻体２０の少なくとも一部に、第１層１１と第２層１２とで中芯層１３を挟み込んで形成された積層構造３０が設けられているので、この積層構造３０によって外殻体２０の所望の部分の軽量化及び高剛性化を図ることができる。つまり、当該ウッド型ゴルフクラブヘッド１は、中芯層１３の見掛け密度が、第１層１１及び第２層１２の見掛け密度よりも小さいので、中芯層１３の厚さを比較的大きくしても、積層構造３０全体としての軽量化を図ることができる。また、中芯層１３を、第１層１１及び第２層１２で挟み込むことで、積層構造３０の剛性を高めることができる。その結果、当該ウッド型ゴルフクラブヘッド１は、例えば均質な層構造を有する従来の構成（例えば複数のプリプレグを多層に積層してなるような構成）を用いる場合と比較して、外殻体２０の所望の部分について、軽量化かつ高剛性化を図ることができる。 <Advantages>
The wood type golf club head 1 is provided with a laminated structure 30 formed by sandwiching the core layer 13 between the first layer 11 and the second layer 12 on at least a part of the outer shell 20. This laminated structure 30 allows desired portions of the outer shell 20 to be made lighter and more rigid. That is, in the wood type golf club head 1, the apparent density of the core layer 13 is smaller than the apparent density of the first layer 11 and the second layer 12, so the thickness of the core layer 13 is made relatively large. Also, the overall weight of the laminated structure 30 can be reduced. Further, by sandwiching the core layer 13 between the first layer 11 and the second layer 12, the rigidity of the laminated structure 30 can be increased. As a result, in the wood type golf club head 1, the outer shell 2 It is possible to reduce the weight and increase the rigidity of a desired portion of the structure.

当該ウッド型ゴルフクラブヘッドの製造方法は、所望の部分の軽量化及び高剛性化を図ることができる外殻体２０を有するウッド型ゴルフクラブヘッド１を製造することができる。 The wood-type golf club head manufacturing method can manufacture the wood-type golf club head 1 having the outer shell body 20 that can reduce the weight and increase the rigidity of desired parts.

［その他の実施形態］
前記実施形態は、本発明の構成を限定するものではない。従って、前記実施形態は、本明細書の記載及び技術常識に基づいて前記実施形態各部の構成要素の省略、置換又は追加が可能であり、それらは全て本発明の範囲に属するものと解釈されるべきである。 [Other embodiments]
The embodiments described above do not limit the configuration of the present invention. Therefore, in the embodiment, it is possible to omit, replace, or add components of each part of the embodiment based on the description in this specification and common general knowledge, and all of these are interpreted as falling within the scope of the present invention. Should.

前記外殻体全体の構成は前記実施形態に記載された構成に限定されない。例えば前記外殻体は、クラウン部に蓋体を有しなくてもよい。さらに、クラウン部に蓋体が設けられている場合であっても、前記積層構造は、蓋体以外の部分に配置されていてもよい。 The overall configuration of the outer shell body is not limited to the configuration described in the embodiment. For example, the outer shell body may not have a lid body at the crown portion. Furthermore, even if the crown portion is provided with a lid, the laminated structure may be arranged in a portion other than the lid.

前記中芯層は、軽量化の観点からは多孔質であることが好ましい。但し、当該ウッド型ゴルフクラブヘッドは、例えば中芯層の材質として比重の小さいものを用いることで、中芯層が空孔を有しない構成とすることも可能である。また、前記中芯層が多孔質である場合、この中芯層に設けられる空孔の形状は、前記実施形態に記載された形状に限定されない。 The core layer is preferably porous from the viewpoint of weight reduction. However, the wood-type golf club head can also be configured such that the core layer does not have holes, for example by using a material with a low specific gravity as the material for the core layer. Furthermore, when the core layer is porous, the shape of the pores provided in the core layer is not limited to the shape described in the embodiment.

以上説明したように、本発明の一態様に係るウッド型ゴルフクラブヘッドは、外殻体の所望の部分について、軽量化かつ高剛性化を図るのに適している。 As described above, the wood-type golf club head according to one aspect of the present invention is suitable for reducing the weight and increasing the rigidity of a desired portion of the outer shell.

１ ウッド型ゴルフクラブヘッド
２ フェース部
３ クラウン部
３ａ 蓋体
４ ソール部
１０ ヘッド本体
１１ 第１層
１２ 第２層
１３ 中芯層
１３ａ 貫通孔
１３ｂ 柱構造
２０ 外殻体
３０ 積層構造
Ｔ 積層構造の平均厚さ
Ｔ１ 中芯層の平均厚さ 1 Wood type golf club head 2 Face portion 3 Crown portion 3a Lid 4 Sole portion 10 Head body 11 First layer 12 Second layer 13 Core layer 13a Through hole 13b Pillar structure 20 Outer shell 30 Laminated structure T Laminated structure Average thickness T1 Average thickness of core layer

Claims (9)

フェース部、クラウン部及びソール部を含む外殻体を有する中空のヘッド本体を備え、
前記外殻体の少なくとも一部に、厚さ方向に間隔を空けて配置される第１層及び第２層と、前記第１層及び前記第２層の間に配置される中芯層とを有する積層構造が設けられており、
前記中芯層の見掛け密度が、前記第１層及び前記第２層の見掛け密度よりも小さいウッド型ゴルフクラブヘッド。 It has a hollow head body having an outer shell body including a face part, a crown part and a sole part,
At least a portion of the outer shell includes a first layer and a second layer arranged at intervals in the thickness direction, and a core layer arranged between the first layer and the second layer. A laminated structure with
A wood-type golf club head, wherein the apparent density of the core layer is smaller than the apparent density of the first layer and the second layer. 前記第１層及び前記第２層が、それぞれ繊維強化樹脂層である請求項１に記載のウッド型ゴルフクラブヘッド。 The wood-type golf club head according to claim 1, wherein the first layer and the second layer are each a fiber-reinforced resin layer. 前記中芯層が多孔質である請求項１又は請求項２に記載のウッド型ゴルフクラブヘッド。 The wood-type golf club head according to claim 1 or 2, wherein the core layer is porous. 前記中芯層が、厚さ方向に貫通する複数の貫通孔を有する請求項３に記載のウッド型ゴルフクラブヘッド。 The wood-type golf club head according to claim 3, wherein the core layer has a plurality of through holes extending through the core layer in the thickness direction. 前記中芯層が、発泡樹脂又はハニカムコアを含む請求項３又は請求項４に記載のウッド型ゴルフクラブヘッド。 The wood-type golf club head according to claim 3 or 4, wherein the core layer includes a foamed resin or a honeycomb core. 前記積層構造の平均厚さに対する前記中芯層の平均厚さの比が０．４以上０．９以下である請求項１から請求項５のいずれか１項に記載のウッド型ゴルフクラブヘッド。 The wood type golf club head according to any one of claims 1 to 5, wherein the ratio of the average thickness of the core layer to the average thickness of the laminated structure is 0.4 or more and 0.9 or less. 前記中芯層の見掛け密度が１０ｋｇ／ｍ３以上２００ｋｇ／ｍ３以下である請求項１から請求項６のいずれか１項に記載のウッド型ゴルフクラブヘッド。 The wood-type golf club head according to any one of claims 1 to 6, wherein the core layer has an apparent density of 10 kg/m 3 or more and 200 kg/m 3 or less. 前記積層構造が前記クラウン部に配置されている請求項１から請求項７のいずれか１項に記載のウッド型ゴルフクラブヘッド。 The wood-type golf club head according to any one of claims 1 to 7, wherein the laminated structure is arranged in the crown portion. フェース部、クラウン部及びソール部を含む外殻体を有する中空のヘッド本体を備え、前記外殻体の少なくとも一部に積層構造が設けられているウッド型ゴルフクラブヘッドの製造方法であって、
厚さ方向に間隔を空けて配置される第１層及び第２層の間に、接着剤を介して、前記第１層及び前記第２層よりも見掛け密度の小さい中芯層を配置し、
前記第１層及び前記第２層に挟み込み圧力を加え、
前記第１層及び前記第２層を前記接着剤によって前記中芯層と接着する、
ウッド型ゴルフクラブヘッドの製造方法。 A method for manufacturing a wood-type golf club head comprising a hollow head body having an outer shell including a face, a crown, and a sole, the outer shell having a laminated structure at least in part, the method comprising:
A core layer having a lower apparent density than the first layer and the second layer is arranged between the first layer and the second layer arranged at intervals in the thickness direction via an adhesive,
Applying sandwiching pressure to the first layer and the second layer,
bonding the first layer and the second layer to the core layer with the adhesive;
A method for manufacturing a wood-type golf club head.
JP2022038591A 2022-03-11 2022-03-11 Wood type golf club head and manufacturing method for wood type golf club head Pending JP2023132963A (en)

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KR1020230024699A KR20230133767A (en) 2022-03-11 2023-02-24 Wood type golf club head and method for manufacturing wood type golf club head
CN202320371834.8U CN219595788U (en) 2022-03-11 2023-03-02 Wooden golf club head
CN202310193211.0A CN116726462A (en) 2022-03-11 2023-03-02 Wood golf club head and method for manufacturing wood golf club head

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JPS63264085A (en) 1987-04-23 1988-10-31 マルマンゴルフ株式会社 Hollow head of golf club
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