JP6931235B2 - How to make a golf club head - Google Patents

How to make a golf club head Download PDF

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JP6931235B2
JP6931235B2 JP2018221508A JP2018221508A JP6931235B2 JP 6931235 B2 JP6931235 B2 JP 6931235B2 JP 2018221508 A JP2018221508 A JP 2018221508A JP 2018221508 A JP2018221508 A JP 2018221508A JP 6931235 B2 JP6931235 B2 JP 6931235B2
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golf club
forging
head
club head
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JP2020081470A (en
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岡田　誠
誠 岡田
淳一 天野
淳一 天野
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Endo Manufacturing Co Ltd
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従来、ゴルフクラブヘッドの設計自由度を向上させるために、素材本体に異なる金属を設けるゴルフクラブの製造方法として、可鍛金属素材からなる素材本体の内部に、素材本体とは比重が異なる金属を内蔵させて一体に熱間鍛造を行う技術が知られている（例えば、特許文献１）。 Conventionally, in order to improve the degree of freedom in designing a golf club head, as a method of manufacturing a golf club in which a different metal is provided on the material body, a metal having a specific gravity different from that of the material body is used inside the material body made of a forged metal material. There is known a technique for performing hot forging integrally by incorporating it (for example, Patent Document 1).

特開２００４−３２９３３５号公報Japanese Unexamined Patent Publication No. 2004-329335

従来技術においては、内蔵される金属は、素材本体の鍛造温度と略同等かより低い融点を有する材料であり、そもそも素材本体と同様に可鍛金属でなければならない、という問題があった。 In the prior art, there is a problem that the built-in metal is a material having a melting point substantially equal to or lower than the forging temperature of the material body, and must be a malleable metal like the material body in the first place.

そこで、本発明では、内蔵される材料にも可鍛金属以外を用いることができるようにして、ゴルフクラブヘッドの設計自由度を向上できるようにすることを目的とする。 Therefore, it is an object of the present invention to make it possible to use a material other than malleable metal as the built-in material so that the degree of freedom in designing the golf club head can be improved.

本発明の請求項１に記載のゴルフクラブヘッドの製造方法は、仕上げ加工前のゴルフクラブの素材本体の少なくとも一部分を、鍛造によって加工して形成するゴルフクラブヘッドの製造方法において、前記素材本体に孔を形成するステップと、前記孔に前記素材本体の材料と比重の異なる粉粒体からなる内蔵部材を充填するステップと、前記孔の開口部を栓体で閉塞するステップと、前記素材本体の鍛造を行うステップとを備えることを特徴とする。 The method for manufacturing a golf club head according to claim 1 of the present invention is a method for manufacturing a golf club head in which at least a part of a material body of a golf club before finishing is processed by forging to form the material body. A step of forming a hole, a step of filling the hole with a built-in member made of powder and granules having a specific gravity different from that of the material of the material body, a step of closing the opening of the hole with a plug, and a step of the material body. It is characterized by having a step of forging.

また、本発明の請求項２に記載のゴルフクラブヘッドの製造方法は、前記開口部を前記栓体で閉塞した後、前記開口部を前記栓体とともに溶接して封止するとともに、前記開口部に非溶接箇所を設け空気抜き部を形成するステップを備えたことを特徴とする。 Further, in the method of manufacturing a golf club head according to claim 2 of the present invention, after closing the opening with the plug, the opening is welded and sealed together with the plug, and the opening is sealed. It is characterized in that it is provided with a step of providing a non-welded portion and forming an air vent portion.

また、本発明の請求項３に記載のゴルフクラブヘッドの製造方法は、前記鍛造時に前記空気抜き部を上向きにするステップを備えたことを特徴とする。 Further, the method for manufacturing a golf club head according to claim 3 of the present invention is characterized in that it includes a step of turning the air vent portion upward during the forging.

また、本発明の請求項４に記載のゴルフクラブヘッドの製造方法は、前記内蔵部材は、セラミックスとしたことを特徴とする。 Further, the method for manufacturing a golf club head according to claim 4 of the present invention is characterized in that the built-in member is made of ceramics.

本発明の請求項１に記載のゴルフクラブヘッドの製造方法によれば、素材本体と内蔵部材の比重差によってゴルフクラブヘッドの重心位置の設定自由度が高まる。また、孔に粉粒体からなる内蔵部材を充填することで、内蔵部材を孔に合せて成形する等の加工の必要が無く、作業工程を省略させて、ゴルフクラブヘッドの製造を容易にすることができる。 According to the method for manufacturing a golf club head according to claim 1 of the present invention, the degree of freedom in setting the position of the center of gravity of the golf club head is increased due to the difference in specific gravity between the material body and the built-in member. Further, by filling the hole with a built-in member made of powder or granular material, it is not necessary to perform processing such as molding the built-in member according to the hole, omitting a work process, and facilitating the manufacture of a golf club head. be able to.

また、本発明の請求項２に記載のゴルフクラブヘッドの製造方法によれば、鍛造時に内蔵部材の気泡を空気抜き部から排出させることで、孔内部における内蔵部材の密度が増加して、素材本体と内蔵部材の一体感を高めることができる。 Further, according to the method for manufacturing a golf club head according to claim 2 of the present invention, by discharging air bubbles of the built-in member from the air vent portion during forging, the density of the built-in member inside the hole is increased, and the material main body is used. And the sense of unity of the built-in member can be enhanced.

また、本発明の請求項３に記載のゴルフクラブヘッドの製造方法によれば、鍛造時に空気抜け部を上向きにすることで、孔内部の内蔵部材がこぼれ落ちるのを抑えることができる。 Further, according to the method for manufacturing a golf club head according to claim 3 of the present invention, it is possible to prevent the built-in member inside the hole from spilling by turning the air vent portion upward during forging.

また、本発明の請求項４に記載のゴルフクラブヘッドの製造方法によれば、内蔵部材に比重の小さいセラミックスを用いることで、主に金属素材が用いられる素材本体との比重差によってゴルフクラブヘッドの重心位置の設定自由度が高まる。また、比重の小さいセラミックスを内蔵することで、従来のゴルフクラブヘッドと重量を同じくしたまま、体積を大きくすることができる。また、粉粒体のセラミックスを孔に充填することで、セラミックスを孔に合せて成形する等の加工の必要が無く、作業工程を省略させて、ゴルフクラブヘッドの製造を容易にすることができる。 Further, according to the method for manufacturing a golf club head according to claim 4 of the present invention, by using ceramics having a small specific gravity for the built-in member, the golf club head is mainly due to the difference in specific gravity from the material main body in which a metal material is used. The degree of freedom in setting the position of the center of gravity of is increased. Further, by incorporating ceramics having a small specific gravity, the volume can be increased while maintaining the same weight as the conventional golf club head. Further, by filling the holes with the ceramics of powder or granular material, it is not necessary to perform processing such as molding the ceramics according to the holes, the work process can be omitted, and the production of the golf club head can be facilitated. ..

本発明の第１実施例を示す斜視図である。It is a perspective view which shows the 1st Example of this invention. 同上、製造時の平断面図である。Same as above, it is a plan sectional view at the time of manufacturing. 同上、製造時の縦断面図である。The same is the vertical sectional view at the time of manufacture. 同上、素材本体の側面図である。The same is the side view of the material body. 同上、ヘッド本体の一部切り欠き正面図である。Same as above, it is a front view of a part of the head body notched. 同上、ヘッド本体の断面図である。Same as above, is a cross-sectional view of the head body. 本発明の第２実施例を示すヘッド本体の一部切り欠き正面図である。It is a partial cutout front view of the head body which shows the 2nd Embodiment of this invention. 同上、ヘッド本体の断面図である。Same as above, is a cross-sectional view of the head body. 本発明の第３実施例を示すヘッド本体の一部切り欠き正面図である。It is a partial cutout front view of the head body which shows 3rd Embodiment of this invention. 同上、ヘッド本体の断面図である。Same as above, is a cross-sectional view of the head body. 本発明の第４実施例を示す斜視図である。It is a perspective view which shows the 4th Example of this invention. 同上、製造時の平断面図である。Same as above, it is a plan sectional view at the time of manufacturing.

以下、本発明のゴルフクラブヘッドの製造方法における好適な実施形態について、添付した図面を参照しながら説明する。なお、以下に説明する実施の形態は、特許請求の範囲に記載された本発明の内容を限定するものではない。また、以下に説明される構成のすべてが、本発明の必須要件であるとは限らない。 Hereinafter, preferred embodiments of the method for manufacturing a golf club head of the present invention will be described with reference to the attached drawings. The embodiments described below do not limit the content of the present invention described in the claims. In addition, not all of the configurations described below are essential requirements of the present invention.

以下、本発明の第１実施例について、添付の図１〜図６を参照して説明する。図１に示すように、アイアン形のゴルフクラブ１は、ヘッド２とこのヘッド２に接続するシャフト３を備えている。ヘッド２は、正面に打撃面となるフェース４が形成され、底面に接地面となるソール５が形成され、さらに一側にはヒール６が形成され、ヒール６の反対側にトウ７が形成される。ヒール６の上部には、シャフト接続部たるホーゼル８が斜め上方へ立設しており、このホーゼル８に形成した孔９にシャフト３の下端１０が接続している。なお、フェース４には、スコアライン等と称する横向きの溝１１が多段に形成されている。 Hereinafter, the first embodiment of the present invention will be described with reference to FIGS. 1 to 6 attached to the invention. As shown in FIG. 1, the iron-shaped golf club 1 includes a head 2 and a shaft 3 connected to the head 2. The head 2 has a face 4 as a striking surface formed on the front surface, a sole 5 as a ground contact surface on the bottom surface, a heel 6 formed on one side, and a toe 7 formed on the opposite side of the heel 6. NS. A hosel 8 serving as a shaft connecting portion stands diagonally upward on the upper portion of the heel 6, and a lower end 10 of the shaft 3 is connected to a hole 9 formed in the hosel 8. The face 4 is formed with a multi-stage lateral groove 11 called a score line or the like.

前記ヘッド２は、打撃に耐える強度を有する可鍛金属、例えば鋼（Ｓ２０Ｃ）により、フェース４、ソール５及びホーゼル８を備えたヘッド本体１２が形成され、さらに、ヘッド本体１２のフェース４の内側上部に内蔵部材１３を横向きに長く内蔵したものである。内蔵部材１３は、ヘッド本体１２の素材本体１４よりも比重が小さく、また、融点が素材本体１４の鍛造温度よりも高い材料からなる粒状素材又は粉末状素材（以下、粉粒体という）であって、例えばセラミックスである酸化アルミ（Ａｌ２Ｏ３，アルミナ）の粒もしくは粉末が用いられている。内蔵部材１３としては、後述するヘッド本体１２の鍛造時に僅かな隙間から内蔵材料１３が飛び出す危険性を回避するため、好ましくは粒状のアルミナが用いられ、さらに好ましくは中心粒径が０．４〜１．２ｍｍの粒状のアルミナが用いられる。アルミナの融点は２０００度以上で硬度が高いが、粒状であるため鍛造時に割れる心配はない。また、アルミナは、不燃物であるため、軽比重金属にありがちな発火の恐れがない。なお、中心粒径が０．４ｍｍ未満では、鍛造時に内蔵部材１３が後述する空気抜き部から噴出する恐れがあるため好ましくない。また、中心粒径が１．２ｍｍより大きいと、鍛造時に後述する孔１５内部で圧縮された内蔵部材１３に空隙が多くなり、ヘッド本体１２の強度の低下や、打感や打撃音に影響を及ぼす恐れがある。 The head 2 is made of a malleable metal having strength to withstand impact, for example, steel (S20C), and a head body 12 having a face 4, a sole 5, and a hosel 8 is formed, and further, the inside of the face 4 of the head body 12 is formed. The built-in member 13 is built in the upper part for a long time in the horizontal direction. The built-in member 13 is a granular material or a powdery material (hereinafter referred to as a powder or granular material) made of a material having a specific gravity smaller than that of the material main body 14 of the head main body 12 and having a melting point higher than the forging temperature of the material main body 14. For example, grains or powder of aluminum oxide (Al 2 O 3 , alumina), which is a ceramic, is used. As the built-in member 13, in order to avoid the risk of the built-in material 13 popping out from a slight gap when the head body 12 is forged, which will be described later, granular alumina is preferably used, and the central particle size is more preferably 0.4 to. 1.2 mm granular alumina is used. Alumina has a melting point of 2000 degrees or more and high hardness, but since it is granular, there is no concern that it will crack during forging. Moreover, since alumina is a non-combustible material, there is no risk of ignition, which is common in light heavy metals. If the central particle size is less than 0.4 mm, the built-in member 13 may be ejected from the air vent portion described later during forging, which is not preferable. Further, when the central particle size is larger than 1.2 mm, there are many voids in the built-in member 13 compressed inside the hole 15 which will be described later at the time of forging, which affects the strength of the head body 12 and the hitting feeling and hitting sound. May affect.

内蔵部材１３として素材本体１４と比重の異なる材料を選択して、内蔵材料１３が素材本体１４の任意の位置に形成された孔１５に充填されるようにすることで、素材本体１４と内蔵部材１３との比重差を利用して、ゴルフクラブ１のヘッド２の重心位置を任意の位置に調整することが可能となる。 By selecting a material having a specific gravity different from that of the material body 14 as the built-in member 13 and filling the holes 15 formed at arbitrary positions of the material body 14 with the built-in material 13, the material body 14 and the built-in member The position of the center of gravity of the head 2 of the golf club 1 can be adjusted to an arbitrary position by utilizing the difference in the specific gravity with the 13.

つぎに製造方法について説明する。一般に、ヘッド本体１２の製造工程においては、打撃に耐えることのできる強度を有する、可鍛金属である鋼（Ｓ２０Ｃ）からなる円柱軸状の素材本体１４を、鋼（Ｓ２０Ｃ）の再結晶温度以上の温度である熱間鍛造温度（約１２００度）まで炉等により加熱して、「潰し鍛造」、「荒地鍛造（荒打ち、荒鍛造、荒加工）」、「仕上げ鍛造（仕上げ打ち、精密鍛造）」などの複数の熱間鍛造を経て、完成品のゴルフクラブヘッドの形状へと近づけていく。 Next, the manufacturing method will be described. Generally, in the manufacturing process of the head main body 12, the columnar shaft-shaped material main body 14 made of steel (S20C), which is a forged metal and has a strength capable of withstanding a hit, is placed at a temperature equal to or higher than the recrystallization temperature of the steel (S20C). "Crushing forging", "Rough ground forging (roughing, rough forging, roughing)", "Finishing forging (finishing, precision forging)" by heating to the hot forging temperature (about 1200 degrees) ) ”And other hot forgings, the shape of the finished golf club head is approached.

ここで、前述の「潰し鍛造」とは、可鍛金属の熱間鍛造温度により加熱した素材本体１４を潰す金型鍛造工程である。また、前述の「荒地鍛造」とは、可鍛金属の熱間鍛造温度により加熱した素材本体１４を、荒地用下金型に載置した状態で荒地用上金型を押圧することにより、ゴルフクラブヘッドの概形に成形する金型鍛造工程である。また、前述の「仕上げ鍛造」とは、可鍛金属の熱間鍛造温度により加熱した素材本体１４を、仕上げ用下金型に載置した状態で仕上げ用上金型を押圧することにより、ゴルフクラブヘッドの完成形に近い形状に成形する金型鍛造工程である。なお、上記「潰し鍛造」、「荒地鍛造」、「仕上げ鍛造」の各鍛造工程は、一例であり、適宜変更可能である。 Here, the above-mentioned "crushing forging" is a die forging step of crushing the material body 14 heated by the hot forging temperature of the malleable metal. Further, the above-mentioned "wasteland forging" is a golfing process in which the material body 14 heated by the hot forging temperature of the malleable metal is placed on the roughland lower die and pressed against the roughland upper die. This is a die forging process for forming the rough shape of a club head. Further, the above-mentioned "finish forging" refers to golf by pressing the finishing upper die with the material body 14 heated by the hot forging temperature of the malleable metal placed on the finishing lower die. This is a die forging process that forms a shape close to the finished shape of the club head. The above-mentioned "crushing forging", "wasteland forging", and "finishing forging" forging steps are examples and can be changed as appropriate.

本実施例においては、上記の製造工程において、図２〜４に示すように、「仕上げ鍛造」以前の鍛造工程によって成形された素材本体１４に、有底円筒状の止まり穴である孔１５を形成する。そして、この孔１５に内蔵部材１３を充填した後に、孔１５の開口部１６を素材本体１４と同一或いは素材本体１４と主成分が同じ栓体１７と、溶接等の固定手段１８により封止する。ここで本実施例の開口部１６は、図４に示すように、鍛造時に上向きとなる側が空気抜き部１９として開放されたまま、その側を除く部分が固定手段１８によって封止されている。なお、孔１５の方向、形状、大きさ、深さ、位置又は数は、適宜変更可能である。本実施例の孔１５は、ゴルフクラブ１のヘッド２の溝１１と平行、かつ、溝１１の略中段部分の後方に内蔵部材１３が内蔵されるように形成されている。 In this embodiment, as shown in FIGS. 2 to 4, in the above manufacturing process, as shown in FIGS. Form. Then, after filling the hole 15 with the built-in member 13, the opening 16 of the hole 15 is sealed with a plug 17 which is the same as the material body 14 or has the same main component as the material body 14 by a fixing means 18 such as welding. .. Here, as shown in FIG. 4, the opening 16 of the present embodiment is sealed by the fixing means 18 while the side facing upward during forging remains open as the air vent portion 19. The direction, shape, size, depth, position or number of the holes 15 can be changed as appropriate. The hole 15 of this embodiment is formed so as to be parallel to the groove 11 of the head 2 of the golf club 1 and to include the built-in member 13 behind the substantially middle stage portion of the groove 11.

そして、図２及び図３に示すように、孔１５に内蔵部材１３が充填された素材本体１４を、ヘッド本体１２の形状に型２０を形成した一方の金型である下金型２１上に載置する。このとき、孔１５に内蔵部材１３が充填された素材本体１４は、あらかじめ、素材本体１４の材料である鋼（Ｓ２０Ｃ）の熱間鍛造温度に炉等により加熱されている。なお、内蔵部材１３の融点は、素材本体１４の再結晶温度以上の温度である熱間鍛造温度より高いため、固相状態のままである。このように、所定の温度に加熱された素材本体１４が下金型２１に載置された状態で、他方の金型である上金型（図示せず）を押圧することにより鍛造を行なって、ヘッド本体１２を成形することができる。さらに、鍛造によって成形されたヘッド本体１２のフェース４を仕上げ加工してスコアライン等と称する横向きの溝１１を形成したり、表面を研磨したり、或いは、ホーゼル８に孔９を形成して仕上げる。なお、空気抜き部１９は、鍛造時に押圧されて封止される。 Then, as shown in FIGS. 2 and 3, the material main body 14 in which the hole 15 is filled with the built-in member 13 is placed on the lower mold 21 which is one of the molds in which the mold 20 is formed in the shape of the head main body 12. Place it. At this time, the material body 14 in which the hole 15 is filled with the built-in member 13 is preheated by a furnace or the like to the hot forging temperature of the steel (S20C) which is the material of the material body 14. Since the melting point of the built-in member 13 is higher than the hot forging temperature, which is a temperature equal to or higher than the recrystallization temperature of the material body 14, it remains in a solid phase state. In this way, forging is performed by pressing the upper die (not shown), which is the other die, while the material body 14 heated to a predetermined temperature is placed on the lower die 21. , The head body 12 can be molded. Further, the face 4 of the head body 12 formed by forging is finished to form a lateral groove 11 called a score line or the like, the surface is polished, or a hole 9 is formed in the hosel 8 to finish. .. The air vent portion 19 is pressed and sealed during forging.

図５及び図６に示すように、完成したゴルフクラブ１のヘッド２は、素材本体１４より比重の小さい内蔵部材１３がヘッド２の下部に内蔵されることにより、内蔵部材１３が内蔵されていない場合と比較して、ヘッド２の重心位置が上昇したものとなっている。したがって、本実施例によれば、ウエッジ形クラブに好ましい高重心のゴルフクラブヘッドを提供することができる。 As shown in FIGS. 5 and 6, the head 2 of the completed golf club 1 does not have the built-in member 13 built-in because the built-in member 13 having a specific gravity smaller than that of the material main body 14 is built in the lower part of the head 2. Compared with the case, the position of the center of gravity of the head 2 is raised. Therefore, according to this embodiment, it is possible to provide a golf club head having a high center of gravity, which is preferable for wedge-shaped clubs.

以上のように、本実施例のゴルフクラブヘッドの製造方法は、仕上げ加工前のゴルフクラブ１の素材本体１４の少なくとも一部分を、鍛造によって加工して形成するゴルフクラブヘッドの製造方法において、素材本体１４に孔１５を形成するステップと、孔１５に素材本体１４の材料と比重の異なる粉粒体からなる内蔵部材１３を充填するステップと、孔１５の開口部１６を栓体１７で閉塞するステップと、素材本体１４の鍛造を行うステップとを備えている。 As described above, the method for manufacturing the golf club head of the present embodiment is the method for manufacturing the golf club head in which at least a part of the material body 14 of the golf club 1 before finishing is processed by forging to form the material body. A step of forming a hole 15 in the hole 14, a step of filling the hole 15 with a built-in member 13 made of a powder or granule having a specific gravity different from that of the material of the material body 14, and a step of closing the opening 16 of the hole 15 with a plug 17. And a step of forging the material body 14.

この場合、素材本体１４と内蔵部材１３の比重差によってゴルフクラブヘッドの重心位置の設定自由度が高まる。また、孔１５に粉粒体からなる内蔵部材１３を充填することで、内蔵部材１３を孔１５に合せて成形する等の加工の必要が無く、作業工程を省略させて、ゴルフクラブヘッドの製造を容易にすることができる。 In this case, the degree of freedom in setting the position of the center of gravity of the golf club head is increased due to the difference in specific gravity between the material body 14 and the built-in member 13. Further, by filling the hole 15 with the built-in member 13 made of powder or granular material, it is not necessary to perform processing such as molding the built-in member 13 in accordance with the hole 15, and the work process can be omitted to manufacture the golf club head. Can be facilitated.

また、本実施例のゴルフクラブヘッドの製造方法では、開口部１６を栓体１７で閉塞した後、開口部１６を栓体１７とともに溶接して封止するとともに、開口部１６に非溶接箇所を設け空気抜き部１９を形成するステップを備えている。 Further, in the method of manufacturing the golf club head of the present embodiment, after the opening 16 is closed by the plug 17, the opening 16 is welded and sealed together with the plug 17, and the opening 16 is provided with a non-welded portion. It is provided with a step of forming the air vent portion 19.

この場合、鍛造時に内蔵部材１３の気泡を空気抜き部１９から排出させることで、孔１５内部における内蔵部材１３の密度が増加して、素材本体１４と内蔵部材１３の一体感を高めることができる。 In this case, by discharging the air bubbles of the built-in member 13 from the air vent portion 19 at the time of forging, the density of the built-in member 13 inside the hole 15 is increased, and the sense of unity between the material body 14 and the built-in member 13 can be enhanced.

また、本実施例のゴルフクラブヘッドの製造方法では、鍛造時に空気抜き部１９を上向きにするステップを備えたことにより、鍛造時に孔１５内部の内蔵部材１３がこぼれ落ちるのを抑えることができる。 Further, in the method of manufacturing the golf club head of the present embodiment, since the step of turning the air vent portion 19 upward during forging is provided, it is possible to prevent the built-in member 13 inside the hole 15 from spilling during forging.

また、本実施例のゴルフクラブヘッドの製造方法では、内蔵部材１３は、セラミックスとしたことにより、主に金属素材が用いられる素材本体１４との比重差によってゴルフクラブヘッドの重心位置の設定自由度が高まる。また、比重の小さいセラミックスを内蔵することで、従来のゴルフクラブヘッドと重量を同じくしたまま、体積を大きくすることができる。また、粉粒体のセラミックスを孔１５に充填することで、セラミックスを孔１５に合せて成形する等の加工の必要が無く、作業工程を省略させて、ゴルフクラブヘッドの製造を容易にすることができる。 Further, in the method of manufacturing the golf club head of the present embodiment, since the built-in member 13 is made of ceramics, the degree of freedom in setting the position of the center of gravity of the golf club head is due to the difference in specific gravity from the material body 14 in which a metal material is mainly used. Will increase. Further, by incorporating ceramics having a small specific gravity, the volume can be increased while maintaining the same weight as the conventional golf club head. Further, by filling the holes 15 with the ceramics of powder or granular material, it is not necessary to perform processing such as molding the ceramics in the holes 15, omitting the work process, and facilitating the manufacture of the golf club head. Can be done.

図７及び図８は、本発明の第２実施例を示すものである。同図において、図１〜図６と同一部分には同一符号を付し、その共通する部分の詳細な説明は省略する。本実施例のヘッド２は、素材本体１４より比重の小さい内蔵部材１３がヘッド２の上部に内蔵されることにより、内蔵部材１３が内蔵されていない場合と比較して、ヘッド２の上部の重量低減にともない、ヘッド２全体の重心位置が降下したものとなっている。したがって、本実施例によれば、ロングアイアンやミドルアイアンに好ましい低重心のゴルフクラブを提供することができる。 7 and 8 show a second embodiment of the present invention. In the figure, the same parts as those in FIGS. 1 to 6 are designated by the same reference numerals, and detailed description of the common parts will be omitted. In the head 2 of the present embodiment, the built-in member 13 having a smaller specific gravity than the material main body 14 is built in the upper part of the head 2, so that the weight of the upper part of the head 2 is heavier than that in the case where the built-in member 13 is not built in. Along with the reduction, the position of the center of gravity of the entire head 2 is lowered. Therefore, according to this embodiment, it is possible to provide a golf club having a low center of gravity, which is preferable for long irons and middle irons.

図９及び図１０は、本発明の第３実施例を示すものである。同図において、図１〜図６と同一部分には同一符号を付し、その共通する部分の詳細な説明は省略する。本実施例のヘッド２は、内蔵部材２２として、素材本体１４の材料である鋼（Ｓ２０Ｃ）より比重が大きく、鋼（Ｓ２０Ｃ）の再結晶温度以上の温度である熱間鍛造温度より高い融点を有するタングステン合金（例えば、炭化タングステン，ＷＣ 融点２０００度以上）の粉粒体を用いたものである。本実施例のゴルフクラブ１のヘッド２は、素材本体１４より比重の大きい内蔵部材２２がヘッド２の下部に内蔵されることにより、ヘッド２の重心位置が降下したものとなっている。したがって、本実施例によれば、ロングアイアンやミドルアイアンに好ましい低重心のゴルフクラブヘッドを提供することができる。 9 and 10 show a third embodiment of the present invention. In the figure, the same parts as those in FIGS. 1 to 6 are designated by the same reference numerals, and detailed description of the common parts will be omitted. As the built-in member 22, the head 2 of this embodiment has a higher specific gravity than the steel (S20C) which is the material of the material body 14, and has a melting point higher than the hot forging temperature which is a temperature equal to or higher than the recrystallization temperature of the steel (S20C). A powder or granule of a tungsten alloy having (for example, tungsten carbide, WC melting point of 2000 ° C. or higher) is used. In the head 2 of the golf club 1 of the present embodiment, the position of the center of gravity of the head 2 is lowered by incorporating the built-in member 22 having a specific gravity larger than that of the material body 14 in the lower part of the head 2. Therefore, according to this embodiment, it is possible to provide a golf club head having a low center of gravity, which is preferable for long irons and middle irons.

図１１及び図１２は、本発明の第４実施例を示すものである。同図において、図１〜図６と同一部分には同一符号を付し、その共通する部分の詳細な説明は省略する。本実施例の内蔵部材２３は、図１２に示すように孔１５にアルミナの粉粒体からなる第１の内蔵部材２３Ａ、タングステン合金の粉粒体からなる第２の内蔵部材２３Ｂの順に充填された複数種類の粉粒体の組み合わせからなる。 11 and 12 show a fourth embodiment of the present invention. In the figure, the same parts as those in FIGS. 1 to 6 are designated by the same reference numerals, and detailed description of the common parts will be omitted. As shown in FIG. 12, the built-in member 23 of this embodiment is filled with the first built-in member 23A made of alumina powder or granular material and the second built-in member 23B made of tungsten alloy powder or granular material in the holes 15 in this order. It consists of a combination of multiple types of powders and granules.

そして、内蔵部材２３は、図１１に示すように、溝１１の後方に第１の内蔵部材２３Ａが配置されるとともに、トウ７側に第２の内蔵部材２３Ｂが配置されるようにヘッド２の下部に内蔵されたものである。 Then, as shown in FIG. 11, the built-in member 23 has a head 2 such that the first built-in member 23A is arranged behind the groove 11 and the second built-in member 23B is arranged on the toe 7 side. It is built in the lower part.

本実施例のゴルフクラブ１のヘッド２は、素材本体１４より比重の小さい第１の内蔵部材２３Ａがヘッド２の下部に内蔵されることにより、第１の内蔵部材２３Ａが内蔵されていない場合と比較して、ヘッド２の重心位置が上昇したものとなっている。したがって、本実施例によれば、ウエッジ形クラブに好ましい高重心のゴルフクラブヘッドを提供することができる。 In the head 2 of the golf club 1 of the present embodiment, the first built-in member 23A having a smaller specific gravity than the material body 14 is built in the lower part of the head 2, so that the first built-in member 23A is not built in. In comparison, the position of the center of gravity of the head 2 is raised. Therefore, according to this embodiment, it is possible to provide a golf club head having a high center of gravity, which is preferable for wedge-shaped clubs.

また、素材本体１４より比重の大きい第２の内蔵部材２３Ｂがヘッド２のトウ７側に内蔵されることにより、第２の内蔵部材２３Ｂが内蔵されていない場合と比較して、ヘッド２の重心位置がトウ７寄りとなっている。したがって、本実施例によれば、ホーゼル８の重量によってフェース４の中心からヒール６寄りに重心が設計されているヘッド２の重心位置をトウ７寄りに変位させることにより、特にホーゼル８が長く設計されて、ヒール６寄りの重心が顕著になるウェッジ形クラブに好ましい重心位置のゴルフクラブヘッドを提供することができる。 Further, since the second built-in member 23B having a larger specific gravity than the material main body 14 is built in the toe 7 side of the head 2, the center of gravity of the head 2 is compared with the case where the second built-in member 23B is not built in. The position is closer to the toe 7. Therefore, according to the present embodiment, the center of gravity of the head 2 whose center of gravity is designed to be closer to the heel 6 from the center of the face 4 is displaced toward the toe 7 by the weight of the hosel 8, so that the hosel 8 is designed to be particularly long. Therefore, it is possible to provide a golf club head having a preferred center of gravity position for a wedge-shaped club in which the center of gravity closer to the heel 6 becomes prominent.

なお、本発明は上記の実施形態に限定されるものではなく、種々の変形実施が可能である。例えば、本実施例では、素材本体１４の材料を鋼（Ｓ２０Ｃ）としているが、その他の金属、例えば、軟鉄などの鉄、チタン、特殊鋼、ステンレス、アルミニウム、マグネシウム、タングステン、銅、ニッケル、ジルコニウム、コバルト、マンガン、亜鉛、シリコン、錫、クロムおよびこれらの合金なども使用可能であり、特に限定されるものではない。 The present invention is not limited to the above embodiment, and various modifications can be made. For example, in this embodiment, the material of the material body 14 is steel (S20C), but other metals such as iron such as soft iron, titanium, special steel, stainless steel, aluminum, magnesium, tungsten, copper, nickel, and zirconium. , Cobalt, manganese, zinc, silicon, tin, chromium and alloys thereof can also be used and are not particularly limited.

また、上記の実施例では、内蔵部材１３、２２、２３は、素材本体１４の材料の再結晶温度より高い融点を有していれば、上述のアルミナ以外のセラミックスやタングステン合金以外の合金としてもよい。ただし、熱間鍛造時の高温状態下における火花による引火を防止する観点から不燃性を有することが好ましい。さらに、内蔵部材１３、２２、２３は、セラミックス、金属又は合成樹脂等の粉粒体を１種類又は複数種類を混合したもの、異なる粒径のものを組み合わせたもの、打感の向上のために内蔵部材１３、２２、２３の空隙を埋めるべく上述の粉粒体に合成樹脂等の添加素材を混合したものとしてもよい。 Further, in the above embodiment, as long as the built-in members 13, 22, and 23 have a melting point higher than the recrystallization temperature of the material of the material body 14, the built-in members 13, 22, and 23 may be ceramics other than alumina or alloys other than tungsten alloy as long as they have a melting point higher than the recrystallization temperature of the material of the material body 14. good. However, it is preferable to have nonflammability from the viewpoint of preventing ignition due to sparks under a high temperature state during hot forging. Further, the built-in members 13, 22 and 23 are made of one or a mixture of powders and granules such as ceramics, metal or synthetic resin, those having different particle sizes, and for improving the feel of hitting. An additive material such as a synthetic resin may be mixed with the above-mentioned powder or granular material in order to fill the voids of the built-in members 13, 22, and 23.

また、熱間鍛造に限らず、再結晶温度以下の常温での冷間鍛造や、熱間鍛造と冷間鍛造の中間の温度での温間鍛造としてもよい、特に、仕上げ工程直前の冷間鍛造では、鍛造後のヘッド本体１２の変形量が少なく、より高い精度での成形が可能となり、ヘッド２の重心位置の設定が高い精度で行える。 Further, not limited to hot forging, cold forging at room temperature below the recrystallization temperature or warm forging at a temperature intermediate between hot forging and cold forging may be used, in particular, cold immediately before the finishing process. In forging, the amount of deformation of the head body 12 after forging is small, molding with higher accuracy is possible, and the position of the center of gravity of the head 2 can be set with high accuracy.

また、内蔵部材１３、２２、２３の位置は、フェース４の後方における上下方向に限定されるものではなく、ヒール６側やその反対側のトウ７側に配置したり、適宜変更することができ、これによって、ヘッド２の低重心、高重心、ヒール寄り重心又はトウ寄り重心等、ヘッド２の重心位置の設定自由度を高めることができる。 Further, the positions of the built-in members 13, 22, and 23 are not limited to the vertical direction behind the face 4, and can be arranged on the heel 6 side or the toe 7 side on the opposite side, or can be changed as appropriate. As a result, it is possible to increase the degree of freedom in setting the position of the center of gravity of the head 2, such as the low center of gravity, the high center of gravity, the center of gravity near the heel, or the center of gravity near the toe of the head 2.

また、内蔵部材１３、２２、２３は、アイアン形のゴルフクラブのヘッド以外にも、ウッド形、アイアン形とウッド形の中間形状のユーティリティ形又はパター等の各種ゴルフクラブにおけるクラウン（上面部）、ソール（底面部）、フェース（打球面）、背面部又は内部構造に対して、内蔵されてもよい。さらに、内蔵部品１３、２２、２３は、鍛造部品パーツと、鋳造部品パーツや樹脂部品パーツ等のその他の部品パーツとの組み合わせからなる複合型ゴルフクラブヘッドの鍛造部品パーツに内蔵されるものであってもよい。 In addition to the iron-shaped golf club heads, the built-in members 13, 22, and 23 are crowns (upper surface portions) of various golf clubs such as wood-shaped, utility-shaped and putters having an intermediate shape between iron-shaped and wood-shaped golf clubs. It may be built into the sole (bottom surface), face (ball striking surface), back surface or internal structure. Further, the built-in parts 13, 22, and 23 are built in the forged parts of the composite golf club head, which are a combination of the forged parts and other parts such as cast parts and resin parts. You may.

１ ゴルフクラブ
１４ 素材本体
１３、２２、２３ 内蔵部材
１５ 孔
１６ 開口部
１７ 栓体
１９ 空気抜き部 1 Golf club 14 Material body 13, 22, 23 Built-in member 15 Hole 16 Opening 17 Plug body 19 Air vent

Claims (4)

仕上げ加工前のゴルフクラブの素材本体の少なくとも一部分を、鍛造によって加工して形成するゴルフクラブヘッドの製造方法において、
前記素材本体に孔を形成するステップと、
前記孔に前記素材本体の材料と比重の異なる粉粒体からなる内蔵部材を充填するステップと、
前記孔の開口部を栓体で閉塞するステップと、
前記素材本体の鍛造を行うステップとを備えることを特徴とするゴルフクラブヘッドの製造方法。 In a method for manufacturing a golf club head, which is formed by forging at least a part of a golf club material body before finishing.
The step of forming a hole in the material body and
A step of filling the hole with a built-in member made of powder or granular material having a specific gravity different from that of the material of the material body,
The step of closing the opening of the hole with a plug body,
A method for manufacturing a golf club head, which comprises a step of forging the material body. 前記開口部を前記栓体で閉塞した後、
前記開口部を前記栓体とともに溶接して封止するとともに、前記開口部に非溶接箇所を設け空気抜き部を形成するステップを備えたことを特徴とする請求項１記載のゴルフクラブヘッドの製造方法。 After closing the opening with the plug,
The method for manufacturing a golf club head according to claim 1, wherein the opening is welded together with the plug to seal the opening, and a step of providing a non-welded portion in the opening to form an air vent is provided. .. 前記鍛造時に前記空気抜き部を上向きにするステップを備えたことを特徴とする請求項２記載のゴルフクラブヘッドの製造方法。 The method for manufacturing a golf club head according to claim 2, further comprising a step of turning the air vent portion upward during forging. 前記内蔵部材は、セラミックスとしたことを特徴とする請求項１〜３のいずれか１項に記載のゴルフクラブヘッドの製造方法。 The method for manufacturing a golf club head according to any one of claims 1 to 3, wherein the built-in member is made of ceramics.
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JPH0647113A (en) * 1992-08-03 1994-02-22 Janome Sewing Mach Co Ltd Golf club head its and manufacture
JPH08308964A (en) * 1995-05-24 1996-11-26 Mitsubishi Materials Corp Golf club head
JP3059397B2 (en) * 1997-01-14 2000-07-04 住友重機械工業株式会社 Golf club head manufacturing method
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JP3135034U (en) * 2007-06-21 2007-08-30 超威科技股▲ふん▼有限公司 Golf club head having air discharge structure
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