JP2020146268A - Golf club and method for manufacturing shaft of golf club - Google Patents

Golf club and method for manufacturing shaft of golf club Download PDF

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Publication number
JP2020146268A
JP2020146268A JP2019046987A JP2019046987A JP2020146268A JP 2020146268 A JP2020146268 A JP 2020146268A JP 2019046987 A JP2019046987 A JP 2019046987A JP 2019046987 A JP2019046987 A JP 2019046987A JP 2020146268 A JP2020146268 A JP 2020146268A
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Prior art keywords
shaft
golf club
main body
layer
appearance
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禎志 戸谷
Sadashi Toya
禎志 戸谷
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Globeride Inc
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Globeride Inc
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Priority to JP2019046987A priority Critical patent/JP2020146268A/en
Priority to CN202010156753.7A priority patent/CN111758685B/en
Publication of JP2020146268A publication Critical patent/JP2020146268A/en
Priority to JP2022091438A priority patent/JP2022107810A/en
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    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
    • A01K87/00—Fishing rods
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B49/00—Stringed rackets, e.g. for tennis
    • A63B49/02—Frames
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B53/00—Golf clubs
    • A63B53/10—Non-metallic shafts
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B53/00—Golf clubs
    • A63B53/12—Metallic shafts
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63C—SKATES; SKIS; ROLLER SKATES; DESIGN OR LAYOUT OF COURTS, RINKS OR THE LIKE
    • A63C11/00—Accessories for skiing or snowboarding
    • A63C11/22—Ski-sticks
    • A63C11/227—Details; Structure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/28—Shaping operations therefor
    • B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/28—Shaping operations therefor
    • B29C70/54—Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B1/00—Layered products having a non-planar shape
    • B32B1/08—Tubular products
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/18—Layered products comprising a layer of metal comprising iron or steel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B2102/00—Application of clubs, bats, rackets or the like to the sporting activity ; particular sports involving the use of balls and clubs, bats, rackets, or the like
    • A63B2102/04—Badminton
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B2102/00—Application of clubs, bats, rackets or the like to the sporting activity ; particular sports involving the use of balls and clubs, bats, rackets, or the like
    • A63B2102/32—Golf
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/52—Sports equipment ; Games; Articles for amusement; Toys
    • B29L2031/5227—Clubs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/70—Agricultural usage or equipment
    • B29L2031/7002—Agricultural usage or equipment for fishing

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  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Marine Sciences & Fisheries (AREA)
  • Animal Husbandry (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Golf Clubs (AREA)

Abstract

To provide a golf club fitted with a shaft whose appearance is improved without causing variations in hardness.SOLUTION: A golf club according to the present invention comprises a shaft made of fiber reinforced resin. The shaft comprises: a main body layer 10A arranged on the inside in the radial direction, and formed of a high-temperature curing material; and an appearance exposure layer 10C arranged on the outside in the radial direction, and formed of a low-temperature curing material.SELECTED DRAWING: Figure 2

Description

本発明は、ゴルフクラブに関し、詳細には、シャフトに特徴を備えたゴルフクラブ、及び、前記シャフトの製造方法に関する。 The present invention relates to a golf club, and more particularly to a golf club having a characteristic shaft and a method for manufacturing the shaft.

従来、ゴルフクラブのシャフトとして、繊維強化樹脂（以下、ＦＲＰと称する）で形成されたものが知られている。ＦＲＰ製のシャフトは、公知のように、芯金に対して、強化繊維に合成樹脂を含浸したプリプレグシートを複数枚巻回すると共に、緊締テープで固定し、これを熱硬化して脱芯することで形成されている（例えば、特許文献１参照）。
このように形成されるシャフトは、材料自体のバラツキ、芯金に対するプリプレグシート等の巻回状態、成型時における樹脂フロー等を精度良く管理することが難しく、成型後の硬さにバラツキが生じているのが現状である。このため、実際の製造現場では、成型時の硬さのバラツキを一定範囲内におさめるために、成型されたシャフトの表面を研磨することが行われている。 Conventionally, as a shaft of a golf club, a shaft made of a fiber reinforced resin (hereinafter referred to as FRP) is known. As is known, in the FRP shaft, a plurality of prepreg sheets in which reinforcing fibers are impregnated with synthetic resin are wound around a core metal, and the shaft is fixed with a tightening tape, which is then thermoset and decentered. (See, for example, Patent Document 1).
With the shaft formed in this way, it is difficult to accurately control the variation in the material itself, the winding state of the prepreg sheet with respect to the core metal, the resin flow during molding, etc., and the hardness after molding varies. The current situation is that there is. For this reason, in an actual manufacturing site, the surface of the molded shaft is polished in order to keep the variation in hardness at the time of molding within a certain range.

特開２０１８−９４０８５号JP-A-2018-94085

ところが、シャフトの硬さのバラツキを修正するために、表面を研磨すると強化繊維が切れるという問題が生じる。ゴルフクラブのシャフトでは、形成素材そのものを外観として視認させたい（最外層の強化繊維の配向状態を視認させたい；外見せとも称する）場合もあるが、強化繊維が切れてしまうと外観が低下するため、最外層の研磨量を少なく（細かい表面研磨程度）設定している。従って、外観の向上を優先する（最外層の研磨量を少なく設定する）と、シャフトの硬さのバラツキを許容せざるを得ず、シャフト性能を犠牲にしなければならない。 However, when the surface is polished in order to correct the variation in the hardness of the shaft, there arises a problem that the reinforcing fibers are cut. In the shaft of a golf club, there are cases where it is desired to visually recognize the forming material itself as an appearance (the orientation state of the reinforcing fibers in the outermost layer is visually recognized; also referred to as appearance), but the appearance deteriorates when the reinforcing fibers are cut. Therefore, the amount of polishing of the outermost layer is set to be small (about fine surface polishing). Therefore, if priority is given to improving the appearance (the amount of polishing of the outermost layer is set to be small), the variation in the hardness of the shaft must be tolerated, and the shaft performance must be sacrificed.

これに対し、最外層として、ガラス繊維によるプリプレグシートを巻回することで、半透明のガラス材料の下地層を外見せすることも可能である。
しかしながら、ガラス材料は、振動数に与える影響が小さいため、振動数を一定範囲に収めようとすると、ガラス繊維によるプリプレグシートを多数、巻回する必要が生じる。ガラス材料は、半透明（透明ではない）であるため、下地層（外見せ材料）の視認性が落ちてしまい、また、研磨量の差異によって、外見せ材料の見え方や重量のバラツキが大きくなってしまう。 On the other hand, by winding a prepreg sheet made of glass fiber as the outermost layer, it is possible to expose the base layer of the translucent glass material.
However, since the glass material has a small influence on the frequency, it is necessary to wind a large number of prepreg sheets made of glass fibers in order to keep the frequency within a certain range. Since the glass material is translucent (not transparent), the visibility of the base layer (external material) is reduced, and the appearance and weight of the external material vary greatly due to the difference in the amount of polishing. turn into.

本発明は、上記した問題に着目してなされたものであり、硬さのバラツキを生じさせることなく、外観を向上させたシャフトを装着したゴルフクラブ、及び、そのようなシャフトの製造方法を提供することを目的とする。 The present invention has been made by paying attention to the above-mentioned problems, and provides a golf club equipped with a shaft having an improved appearance without causing a variation in hardness, and a method for manufacturing such a shaft. The purpose is to do.

上記した目的を達成するために、本発明は、繊維強化樹脂製のシャフトを備えたゴルフクラブにおいて、前記シャフトは、径方向内側に配設され高温硬化材料で形成される本体層と、その径方向外側に配設され低温硬化材料で形成される外観露出層と、を有することを特徴とする。 In order to achieve the above object, the present invention relates to a golf club provided with a shaft made of a fiber reinforced resin, wherein the shaft is arranged inside in the radial direction and is formed of a high temperature curing material, and a main body layer thereof and a diameter thereof. It is characterized by having an externally exposed layer disposed on the outer side in the direction and formed of a low-temperature curing material.

上記したゴルフクラブのシャフト構造では、内層側に、高温硬化する樹脂材料による本体層があり、外層側に、低温硬化する樹脂材料（外見せ材料）による外観露出層を配設しているため、内層側の本体層を加熱処理した後に、表面研磨をして硬さのバラツキを事前調整した後、外見せ材料を追加成型することが可能となる。すなわち、シャフトの性能を一定水準に維持しながら、外観の向上を図ることが可能となる。 In the above-mentioned golf club shaft structure, the inner layer side has a main body layer made of a resin material that cures at a high temperature, and the outer layer side has an appearance exposed layer made of a resin material that cures at a low temperature (appearance material). After the main body layer on the inner layer side is heat-treated, the surface is polished to adjust the hardness variation in advance, and then the appearance material can be additionally molded. That is, it is possible to improve the appearance while maintaining the performance of the shaft at a certain level.

なお、本発明は、外見せ材料を、通常のスチールシャフトの表面に配設することで外観を向上するような構成であっても良い。このような構成では、管状体として構成されているスチールシャフトの少なくとも一部の領域に、繊維強化樹脂製のプリプレグシートによって形成される外観露出層を巻回する構成であれば良い。この場合、巻回されるプリプレグシートを熱硬化する際、スチールシャフト表面との密着性が向上して剥離が生じない（外観が低下しない）ように、プリプレグシートが巻回される部分の表面を粗面化しておくことが好ましい。 In addition, the present invention may have a configuration in which the appearance is improved by disposing the appearance material on the surface of a normal steel shaft. In such a configuration, an externally exposed layer formed of a prepreg sheet made of fiber reinforced resin may be wound around at least a part of a region of the steel shaft configured as a tubular body. In this case, when the wound prepreg sheet is thermoset, the surface of the portion where the prepreg sheet is wound is covered so that the adhesion with the steel shaft surface is improved and peeling does not occur (the appearance is not deteriorated). It is preferable to roughen the surface.

また、上記した目的を達成するために、本発明は、ゴルフクラブのシャフトの製造方法を提供するのであり、高温硬化材料製のプリプレグシートを芯金に巻回し、加熱することで管状の本体層を形成する第１成型工程と、前記第１成型工程によって形成された本体層の表面を研磨する研磨工程と、前記表面が研磨された本体層に、低温硬化材料製のプリプレグシートを巻回し、加熱することで外観露出層を形成する第２成型工程と、を有することを特徴とする。 Further, in order to achieve the above-mentioned object, the present invention provides a method for manufacturing a shaft of a golf club, in which a prepreg sheet made of a high-temperature curing material is wound around a core metal and heated to form a tubular main body layer. A first molding step of forming a surface, a polishing step of polishing the surface of the main body layer formed by the first molding step, and a prepreg sheet made of a low-temperature curing material are wound around the main body layer whose surface has been polished. It is characterized by having a second molding step of forming an externally exposed layer by heating.

上記した製造方法では、第１成型工程で、管状の本体層が形成され、その後の研磨工程で表面を研磨処理することで、シャフト（管状に形成された本体層）の硬さのバラツキを一定の範囲に収めることができる。その後、第１成型工程で用いられる本体層の樹脂よりも低温で硬化する低温硬化材料製のプリプレグシートを巻回し、加熱することで、内層側に配設される高温硬化材料に対して加熱による影響を与えることなく、低温硬化材料製のプリプレグシートを外見せ材として使用することができるため、シャフトの性能を一定水準に維持しながら、外観の向上が図れるシャフトを製造することが可能となる。 In the above-mentioned manufacturing method, a tubular main body layer is formed in the first molding step, and the surface is polished in the subsequent polishing step to make the hardness variation of the shaft (tubular main body layer) constant. Can be contained in the range of. After that, a prepreg sheet made of a low-temperature curing material that cures at a lower temperature than the resin of the main body layer used in the first molding step is wound and heated to heat the high-temperature curing material disposed on the inner layer side. Since a prepreg sheet made of a low-temperature curing material can be used as an appearance material without affecting the shaft, it is possible to manufacture a shaft that can improve the appearance while maintaining the performance of the shaft at a certain level. ..

本発明によれば、硬さのバラツキを生じさせることなく、外観を向上させたシャフトを装着したゴルフクラブ、及び、そのようなシャフトを容易に製造できる製造方法が得られる。 According to the present invention, a golf club equipped with a shaft having an improved appearance and a manufacturing method capable of easily manufacturing such a shaft can be obtained without causing a variation in hardness.

ゴルフクラブの一例を示す正面図。A front view showing an example of a golf club. 図１に示したシャフトの構成素材であるプリプレグシートの配設例を示すパターン図。FIG. 5 is a pattern diagram showing an arrangement example of a prepreg sheet which is a constituent material of the shaft shown in FIG. （ａ）は、外観露出層が設けられた部分のシャフトの横断面図、（ｂ）は、その位置での軸線方向に沿った縦断面図。(A) is a cross-sectional view of the shaft of the portion where the externally exposed layer is provided, and (b) is a vertical cross-sectional view along the axial direction at that position. シャフトの製造工程の一例を説明するフローチャート。A flowchart illustrating an example of a shaft manufacturing process.

以下、図面を参照しながら、本発明に係るゴルフクラブの実施形態について説明する。
図１に示すゴルフクラブ１は、ウッド型のゴルフクラブを例示しており、シャフト１０の先端側には、ヘッド３０が装着され、シャフト１０の基端側には、ラバー等によって形成されたグリップ４０が装着されている。 Hereinafter, embodiments of the golf club according to the present invention will be described with reference to the drawings.
The golf club 1 shown in FIG. 1 exemplifies a wood-type golf club, in which a head 30 is attached to the tip end side of the shaft 10 and a grip formed of rubber or the like is attached to the base end side of the shaft 10. 40 is attached.

前記シャフト１０は、シートワインディング法によって形成されており、強化繊維に合成樹脂を含浸したプリプレグシートを芯金に対して巻回し、これを熱硬化して脱芯することで形成されるＦＲＰ製である。芯金に対して巻回されるプリプレグシートは、シャフト１０の全長に亘って巻回されるプリプレグシート（以下、本体シートとも称し、積層構造として本体層を構成する）と、ヘッド装着領域やグリップ装着領域等、部分的に強度を向上するために巻回されるプリプレグシート（以下、補強シートとも称し、積層構造として補強層を構成する）と、本体層の径方向外方に巻回されて、外観を露出する外見せ材として構成されるプリプレグシート（以下、外観シートとも称し、積層構造として外観露出層を構成する）と、を備えている。 The shaft 10 is formed by a sheet winding method, and is made of FRP formed by winding a prepreg sheet in which reinforcing fibers are impregnated with a synthetic resin around a core metal, and then thermosetting and decentering the prepreg sheet. is there. The prepreg sheet wound around the core metal includes a prepreg sheet wound over the entire length of the shaft 10 (hereinafter, also referred to as a main body sheet, which constitutes a main body layer as a laminated structure), a head mounting area, and a grip. A prepreg sheet (hereinafter, also referred to as a reinforcing sheet, which constitutes a reinforcing layer as a laminated structure) that is wound to partially improve the strength of the mounting area, etc., and a main body layer that is wound outward in the radial direction. A prepreg sheet (hereinafter, also referred to as an appearance sheet, which constitutes an appearance exposed layer as a laminated structure), which is formed as an appearance material for exposing the appearance, is provided.

前記本体層を構成する本体シート、及び、補強層を構成する補強シートは、複数枚存在していても良い。また、前記外観露出層を構成する外観シートは、シャフト１０の全長に亘って巻回される構成であっても良いし、軸方向の一定の長さ範囲に巻回される構成であっても良く、全周に亘って巻回されない構成であっても良い。 A plurality of main body sheets constituting the main body layer and a plurality of reinforcing sheets forming the reinforcing layer may exist. Further, the appearance sheet constituting the appearance exposed layer may be wound over the entire length of the shaft 10 or may be wound within a certain length range in the axial direction. It may be configured so that it is not wound all around.

本発明では、本体シート（補強シート）を構成しているプリプレグシートの基材（マトリクス樹脂）と、外観シートを構成しているプリプレグシートの基材が異なるタイプのものが使用されており、本体シート（補強シート）は、高温で硬化するタイプのもの（以下、高温硬化材料とも称する）が用いられ、外観シートは、それよりも低い温度で硬化するタイプのもの（以下、低温硬化材料とも称する）が用いられている。これは、シャフト１０を作成するにあたり、内層側となる本体層を形成する加熱処理工程の後に、硬さのバラツキを補正する表面研磨を行ない、表面研磨された本体層に対して、外層側となる外観露出層を形成する加熱処理工程を行なう（二重成型を行なう）ためである。すなわち、加工処理された状態にある本体層が、外観露出層を形成する際に、熱の影響（例えば軟化したり、粘度が落ちて密着性が低下する等の影響）を受けないように、外観シートについては、本体シートよりも低い温度で硬化するタイプのものが用いられる。 In the present invention, a type in which the base material (matrix resin) of the prepreg sheet constituting the main body sheet (reinforcing sheet) and the base material of the prepreg sheet constituting the appearance sheet are different is used, and the main body is used. As the sheet (reinforcing sheet), a type that cures at a high temperature (hereinafter, also referred to as a high-temperature curing material) is used, and the appearance sheet is a type that cures at a lower temperature (hereinafter, also referred to as a low-temperature curing material). ) Is used. In producing the shaft 10, after the heat treatment step of forming the main body layer to be the inner layer side, surface polishing is performed to correct the variation in hardness, and the surface-polished main body layer is compared with the outer layer side. This is because the heat treatment step of forming the appearance exposed layer is performed (double molding is performed). That is, the main body layer in the processed state is not affected by heat (for example, the influence of softening, the viscosity is lowered, and the adhesion is lowered) when the appearance exposed layer is formed. As the appearance sheet, a type that cures at a lower temperature than the main body sheet is used.

具体的に例示すると、本体シート（補強シート）を構成するプリプレグシートは、基材として１２０°〜１３０°付近で硬化する熱硬化性樹脂（例えば、エポキシ樹脂）が用いられ、外観シートを構成するプリプレグシートは、基材として、上記した硬化温度よりも低い温度、例えば、１００°以下、好ましくは７０°〜８０°付近で硬化する熱硬化性樹脂（例えば、エポキシ樹脂）が用いられる。また、各プリプレグシートを構成する強化繊維については、特に限定されることはなく、パラ系芳香族ポリアミドや高強度ポリエチレン等の有機系の繊維、炭素繊維、ガラス繊維、ボロン繊維、炭化ケイ素繊維、アルミナ繊維等の無機系の繊維、更には、金属系の繊維を用いることが可能であり、これらの繊維を２種以上組み合わせて使用しても良い。 Specifically, as the prepreg sheet constituting the main body sheet (reinforcing sheet), a thermosetting resin (for example, epoxy resin) that cures at around 120 ° to 130 ° is used as the base material, and constitutes the appearance sheet. As the prepreg sheet, a thermosetting resin (for example, epoxy resin) that cures at a temperature lower than the above-mentioned curing temperature, for example, 100 ° or less, preferably around 70 ° to 80 °, is used as the base material. The reinforcing fibers constituting each prepreg sheet are not particularly limited, and organic fibers such as para-aromatic polyamide and high-strength polyethylene, carbon fibers, glass fibers, boron fibers, silicon carbide fibers, etc. Inorganic fibers such as alumina fibers and further metal fibers can be used, and two or more of these fibers may be used in combination.

また、上記したプリプレグシートを構成する強化繊維は、編成されたものであっても良いし、一方向（軸長方向、周方向、傾斜方向）に引き揃えられたものであっても良い。この場合、外観シートは、外見せ材となるため、外観が向上するような構成のもの、例えば、平織、組布、金属線が介在されたもの等を用いることが好ましい。また、各プリプレグシートの樹脂含浸量（ＲＣ）については、特に限定されることはないが、外観シートについては、本体シートによって成型される本体層との間で密着強度が確保されるように、本体シートよりもある程度、樹脂含浸量が高いことが好ましい。ただし、樹脂含浸量が高すぎると、べた付いて作業し辛くなるため（４５％の場合、作業がし辛い結果が得られた）、３０〜４０％程度のものを用いることが好ましい。例えば、本体シートについては、樹脂含浸量が１５〜３５％程度のものを用い、外観シートについては、樹脂含浸量が２０〜４５％程度のものを用いることが可能である。 Further, the reinforcing fibers constituting the above-mentioned prepreg sheet may be knitted or may be aligned in one direction (axial length direction, circumferential direction, inclined direction). In this case, since the appearance sheet serves as an appearance material, it is preferable to use a structure that improves the appearance, for example, a plain weave, a braided cloth, or a sheet having a metal wire interposed therebetween. The resin impregnation amount (RC) of each prepreg sheet is not particularly limited, but the appearance sheet is provided so that the adhesion strength is ensured between the appearance sheet and the main body layer molded by the main body sheet. It is preferable that the resin impregnation amount is higher to some extent than the main body sheet. However, if the amount of resin impregnated is too high, the work becomes sticky and difficult to work (in the case of 45%, the work is difficult to obtain), so it is preferable to use about 30 to 40%. For example, it is possible to use a main body sheet having a resin impregnation amount of about 15 to 35% and an appearance sheet having a resin impregnation amount of about 20 to 45%.

以下、図２を参照して、以上のような特性を有するシャフトの構成例（芯金５０に巻回される本体シート、補強シート、外観シートの構成、及び、その配設例）について説明する。 Hereinafter, with reference to FIG. 2, a configuration example of a shaft having the above characteristics (configuration of a main body sheet, a reinforcing sheet, an appearance sheet wound around a core metal 50, and an arrangement example thereof) will be described.

図２において、本体層１０Ａを構成する本体シートは、シャフトの全体長さＬに亘って巻回され、内層側から、強化繊維を周方向に引き揃えた本体シート１１、強化繊維を軸長方向に対して＋４５°方向に引き揃えた第１の斜向シートと強化繊維を軸長方向に対して−４５°方向に引き揃えた第２の斜向シートとを重ね合わせた本体シート１２、強化繊維を軸長方向に引き揃えた本体シート１３，１４，１５を備えて構成されている。この場合、各本体シートの巻回数については限定されることはなく、その配列順、パターン形状、強化繊維の方向についても限定されることはない。
なお、図において、Ｌ１で示す領域は、ヘッドが挿入される部分であり、Ｌ２で示す領域は、グリップが装着される部分である。 In FIG. 2, the main body sheet constituting the main body layer 10A is wound over the entire length L of the shaft, and the main body sheet 11 in which the reinforcing fibers are aligned in the circumferential direction and the reinforcing fibers in the axial length direction are arranged from the inner layer side. Main body sheet 12 in which the first oblique sheet aligned in the + 45 ° direction and the second oblique sheet aligned in the -45 ° direction with respect to the axial length direction are superposed with respect to the main body sheet 12, reinforced. The main body sheets 13, 14 and 15 in which the fibers are aligned in the axial length direction are provided. In this case, the number of turns of each main body sheet is not limited, and the arrangement order, pattern shape, and direction of the reinforcing fibers are not limited.
In the figure, the region indicated by L1 is a portion where the head is inserted, and the region indicated by L2 is a portion where the grip is mounted.

前記本体層１０Ａを構成する本体シートには、ヘッドが装着される先端側に補強シート１７が巻回され、補強層１０Ｂを構成する。補強シート１７は、強化繊維を軸長方向に引き揃えて構成されているが、強化繊維の方向については、限定されることはない。また、必要に応じて、グリップが装着される基端側にも補強シートを巻回しても良い。 A reinforcing sheet 17 is wound around the tip side on which the head is mounted on the main body sheet constituting the main body layer 10A to form the reinforcing layer 10B. The reinforcing sheet 17 is configured by aligning the reinforcing fibers in the axial length direction, but the direction of the reinforcing fibers is not limited. Further, if necessary, a reinforcing sheet may be wound around the base end side on which the grip is mounted.

外観露出層１０Ｃを構成する外観シートは、本体シート及び補強シートが加熱され、管状体としてその本体層１０Ａの表面が研磨された後に巻回される。すなわち、本体シート１１〜１５によって本体層１０Ａを成型した際の硬さのバラツキを一定範囲に収めるために、本体層の表面を研磨処理した後に巻回される（研磨部分の表面に巻回される）。図２では、外観シートの構成を解り易くするために、４枚の外観シート２１，２２，２３，２４が例示されているが、これらの全てが巻回されている必要はなく、いずれかの外観シートが巻回されていれば良い（任意の組み合わせでも良い）。 The appearance sheet constituting the appearance exposed layer 10C is wound after the main body sheet and the reinforcing sheet are heated and the surface of the main body layer 10A is polished as a tubular body. That is, in order to keep the variation in hardness when the main body layer 10A is molded by the main body sheets 11 to 15 within a certain range, the surface of the main body layer is polished and then wound (wound around the surface of the polished portion). ). In FIG. 2, four appearance sheets 21, 22, 23, 24 are illustrated in order to make the structure of the appearance sheet easy to understand, but it is not necessary that all of them are wound, and any one of them is required. The appearance sheet may be wound (any combination is acceptable).

巻回される外観シートの巻回位置、巻回数、強化繊維の配置状態等、特に限定されることはないが、外観シート２１は、シャフトの全体長さＬに亘って巻回され、強化繊維を軸長方向に引き揃えたもの、外観シート２２は、シャフトの先端側に巻回され、強化繊維を軸長方向に引き揃えたもの、外観シート２３は、シャフトの中間領域に巻回され、強化繊維を軸長方向に引き揃えたもの、外観シート２４は、シャフトの後端側でグリップから露出するように巻回され、強化繊維を軸長方向に引き揃えたものを示している。 The winding position of the appearance sheet to be wound, the number of times of winding, the arrangement state of the reinforcing fibers, etc. are not particularly limited, but the appearance sheet 21 is wound over the entire length L of the shaft and the reinforcing fibers are wound. The appearance sheet 22 is wound around the tip end side of the shaft, and the reinforcing fibers are aligned in the shaft length direction. The appearance sheet 23 is wound around the intermediate region of the shaft. The appearance sheet 24, in which the reinforcing fibers are aligned in the axial length direction, is wound so as to be exposed from the grip on the rear end side of the shaft, and the reinforcing fibers are aligned in the axial length direction.

上記したように、外観シートは、外見せすることを目的として巻回するものであることから、外観を向上させたい部分に巻回する構成であれば良い。また、外見せが主な目的であることから、シャフトの基本性能に影響を与えないように、できるだけ肉厚は薄い方が好ましい。このため、肉厚については、図３（ａ）（ｂ）に示すように、外観露出層１０Ｃの肉厚Ｔは、本体層１０Ａの肉厚Ｔ１よりも薄くなるように巻回することが好ましい。例えば、外観目的で平織や組布等を巻回する場合は、１プライ程度にするなど、少数プライで巻回することが好ましいが、剛性を向上する等の目的がある場合、複数プライ数で巻回するようにしても良い。 As described above, since the appearance sheet is wound for the purpose of showing the appearance, it may be wound around the portion where the appearance is desired to be improved. Further, since the main purpose is to show the appearance, it is preferable that the wall thickness is as thin as possible so as not to affect the basic performance of the shaft. Therefore, regarding the wall thickness, as shown in FIGS. 3A and 3B, it is preferable to wind the externally exposed layer 10C so that the wall thickness T is thinner than the wall thickness T1 of the main body layer 10A. .. For example, when winding a plain weave or braid for the purpose of appearance, it is preferable to wind it with a small number of plies such as about 1 ply, but if there is a purpose such as improving rigidity, a plurality of plies may be used. You may try to wind it.

次に、図２に示すようなプリプレグシートの配列パターンでシャフトを成型するシャフトの製造工程について、図４を参照しながら説明する。
最初に、第１成型工程が行われる。この第１成形工程は、芯金５０に離型剤を塗布し、順に、高温硬化材料製のプリプレグシート（本体シート１１〜１５）及び補強シート１７を、手作業で巻回、又は、シートローリングマシンを用いて機械的に巻回し、その表面に緊締テープ（ラッピングテープ；図示せず）を巻回する。緊締テープは、主に本体層の保形性を確保すると共に、ボイドの発生を抑制するために巻回されるものであり、プリプレグシートが巻回された芯金５０をチャッキングした状態でテープラッピングマシンを用いて一定の圧力で巻回される。 Next, a shaft manufacturing process for molding the shaft with the arrangement pattern of the prepreg sheets as shown in FIG. 2 will be described with reference to FIG.
First, the first molding step is performed. In this first molding step, a mold release agent is applied to the core metal 50, and a prepreg sheet (main body sheets 11 to 15) and a reinforcing sheet 17 made of a high-temperature curing material are manually wound or sheet-rolled in order. It is mechanically wound using a machine, and a tightening tape (wrapping tape; not shown) is wound around the surface thereof. The tightening tape is wound mainly to secure the shape retention of the main body layer and to suppress the generation of voids, and the tape is in a state where the core metal 50 around which the prepreg sheet is wound is chucked. It is wound at a constant pressure using a wrapping machine.

引き続いて、上記した本体シート、補強シート及び緊締テープが巻回された芯金は、加熱炉に搬送されて加熱処理が施され、マトリクス樹脂が上記した高温の硬化温度で硬化され、その後、脱芯、緊締テープが剥離されて、管状となった本体層１０Ａが形成される。 Subsequently, the core metal around which the main body sheet, the reinforcing sheet and the tightening tape are wound is transported to a heating furnace and heat-treated, and the matrix resin is cured at the above-mentioned high curing temperature, and then removed. The core and the tightening tape are peeled off to form a tubular body layer 10A.

引き続いて、管状となった本体層１０Ａの表面を研磨する。この研磨は、硬さのバラツキを調整するために行われるものであり、湿式のベルトサンダー研磨や、サンドペーパによる手研磨等で行なうことが可能である。なお、外観露出層との間で密着性が向上するように、外観シートが巻回される部分の表面を粗面化処理しておいても良い。 Subsequently, the surface of the tubular body layer 10A is polished. This polishing is performed to adjust the variation in hardness, and can be performed by wet belt sander polishing, hand polishing with sand paper, or the like. The surface of the portion around which the appearance sheet is wound may be roughened so as to improve the adhesion to the appearance exposed layer.

引き続いて、第２成型工程が行われる。この第２成形工程は、表面が研磨された本体層上に、外観露出層１０Ｃを形成するための処理であり、最初に、本体層１０Ａを上記第１成型工程と同じ芯金５０に外嵌し、上記した第１成型工程と同様、低温硬化材料製のプリプレグシート（外観シート２１〜２４のいずれか、又は、その複数）を巻回し、その表面に緊締テープ（ラッピングテープ）を巻回する。この場合、作業性を考慮すると、外観シートを巻回する前に、本体層１０Ａを同じ芯金に外嵌することが好ましいが、表面が研磨された本体層に剛性があって、外観シートのローリング作業の押し圧に耐えられる場合、緊締テープの巻回作業時から芯金に外嵌するようにしても良い。 Subsequently, the second molding step is performed. This second molding step is a process for forming the externally exposed layer 10C on the main body layer whose surface has been polished. First, the main body layer 10A is fitted onto the core metal 50 which is the same as the first molding step. Then, as in the first molding step described above, a prepreg sheet made of a low-temperature curing material (any one of the appearance sheets 21 to 24 or a plurality thereof) is wound, and a tightening tape (wrapping tape) is wound around the surface thereof. .. In this case, in consideration of workability, it is preferable to externally fit the main body layer 10A to the same core metal before winding the appearance sheet, but the main body layer whose surface is polished has rigidity, and the appearance sheet has a rigidity. If it can withstand the pressing force of the rolling work, it may be fitted to the core metal from the time of winding the tightening tape.

そして、外観シート及び緊締テープが巻回された芯金は、上記した低温の硬化温度で硬化処理が行われる。この第２成型工程における加熱温度は、外観露出層１０Ｃである低温効果材料を硬化させる程度であるため、本体層１０Ａを構成している高温硬化材料が軟化するようなことはなく、安定したシャフト性能を発揮することができる。 Then, the appearance sheet and the core metal around which the tightening tape is wound are cured at the above-mentioned low curing temperature. Since the heating temperature in this second molding step is such that the low-temperature effect material which is the externally exposed layer 10C is cured, the high-temperature curing material constituting the main body layer 10A does not soften, and the shaft is stable. It can demonstrate its performance.

その後、脱芯、緊締テープが剥離されて、シャフト１０が形成される。緊締テープが剥離されると、その表面には、螺旋状の凹凸が存在するため、細研磨が行われ、表面が平滑化される。平滑化された表面には、クリア層を形成したり、必要に応じて、文字や図形などの装飾層を形成しても良い。 After that, the decentering and the tightening tape are peeled off to form the shaft 10. When the tightening tape is peeled off, the surface thereof has spiral irregularities, so that fine polishing is performed to smooth the surface. A clear layer may be formed on the smoothed surface, and a decorative layer such as characters and figures may be formed if necessary.

上記した構成のシャフトによれば、シャフト硬さのバラツキを事前に調整した後に、外見せ用の材料を追加成型することで、シャフトの性能を出しながら外見せ外観の向上を図ることが可能となる。すなわち、外観露出層１０Ｃは、繊維切れ等が生じていないため、表面の外観を向上することが可能となる。 According to the shaft having the above configuration, after adjusting the variation in shaft hardness in advance, it is possible to improve the appearance appearance while improving the performance of the shaft by additionally molding the material for appearance. Become. That is, since the appearance exposed layer 10C does not have fiber breakage or the like, the appearance of the surface can be improved.

また、外観露出層１０Ｃは、従来のように、硬さのバラツキ調整のために研磨処理しない（シャフトとして効果の発現性が高い最外層を削らない）か、或いは、塗装のために表面を荒らす程度の細かい研磨をする。この場合、表面を荒らす程度の細かい研磨を実施するにあたって、例えば、強度発現性の高い高強度強化繊維（例えば、東レ社製のＴ１１００ＧやＭ４０Ｘ、三菱ケミカル社製のＭＲ７０（共に繊維名称）、ボロン等の金属線を融合させたプリプレグなど）や、比重の重いタングステンパウダーと、低温硬化型の樹脂とを組み合わせた特殊なプリプレグシートを用いても、その性能を確保することが可能となる。さらに、上記したような二重成型方法であれば、潰し強度を改善するために、通常では、研磨によって削られてしまう程度の薄番手の材料を最外層に配設することが可能となる。 Further, the appearance exposed layer 10C is not polished (the outermost layer having a high effect as a shaft is not scraped) to adjust the hardness variation as in the conventional case, or the surface is roughened for painting. Polish to a fine degree. In this case, in performing fine polishing to the extent that the surface is roughened, for example, high-strength reinforcing fibers having high strength development (for example, T1100G and M40X manufactured by Toray Industries, MR70 manufactured by Mitsubishi Chemical Co., Ltd. (both fiber names), Boron). It is possible to ensure the performance even by using a special prepreg sheet that is a combination of a tungsten powder with a heavy specific gravity and a low-temperature curable resin (such as a prepreg fused with a metal wire such as). Further, in the double molding method as described above, in order to improve the crushing strength, it is possible to dispose a thin-count material that is usually scraped by polishing in the outermost layer.

上記した構成の外観露出層は、一般的なスチールシャフトの表面に形成することが可能である。外観露出層については、スチールシャフト表面との密着性、及び、剥離のし難さを考慮すると、上記したような低温硬化型の樹脂材料（１００°以下、好ましくは、７０°〜８０°付近で硬化する樹脂材料）で構成されていることが好ましい。また、このような構成においても、外観露出層を構成するプリプレグシートを巻回する前に、その表面を粗面化処理しておくことが好ましい。 The externally exposed layer having the above-described configuration can be formed on the surface of a general steel shaft. Regarding the externally exposed layer, considering the adhesion to the steel shaft surface and the difficulty of peeling, the low temperature curable resin material as described above (100 ° or less, preferably around 70 ° to 80 °). It is preferably composed of a resin material that cures). Further, even in such a configuration, it is preferable to roughen the surface of the prepreg sheet constituting the externally exposed layer before winding it.

この場合、スチールシャフトの表面の粗面化状態と、外見せ材となる上記した低温硬化型の樹脂材料との密着性について、表面の粗面化状態を変えて剥離が生じるか否かを検証した。外見せ材は、１プライ以上巻回すると、剥離は見出せなかったため、スチールシャフトの表面に部分巻きした際の剥離状況について、表面の粗面状態が異なる複数のサンプルで検証を行なったところ、表面粗さ（Ｒａ値）が０．２３９８のときにごく一部において僅かな剥離が見出された。したがって、部分巻する場合（１プライ以上でも良い）は、スチールシャフトの該当する部分の表面のＲａ値を、０．２５以上に粗面化した状態で外観露出層を形成することが望ましい。すなわち、このような構成では、プライマー等を用いることなく、密着性の良い外観露出層を形成することが可能である。 In this case, regarding the adhesion between the roughened state of the surface of the steel shaft and the above-mentioned low-temperature curable resin material used as the appearance material, it is verified whether or not peeling occurs by changing the roughened state of the surface. did. No peeling was found when the exterior material was wound with one ply or more. Therefore, when the peeling condition when partially wound on the surface of the steel shaft was verified with a plurality of samples having different rough surface conditions, the surface was verified. When the roughness (Ra value) was 0.2398, slight peeling was found in a small part. Therefore, in the case of partial winding (1 ply or more may be used), it is desirable to form the externally exposed layer in a state where the Ra value of the surface of the corresponding portion of the steel shaft is roughened to 0.25 or more. That is, in such a configuration, it is possible to form an externally exposed layer having good adhesion without using a primer or the like.

なお、本体層が、上記した高温硬化型の樹脂材料であれば、粗面化しなくても、剥離現象は生じなかった。 If the main body layer was the above-mentioned high-temperature curable resin material, the peeling phenomenon did not occur even if the surface was not roughened.

以上、本発明の実施形態について説明したが、本発明は、上記した実施形態に限定されることはなく、種々、変形することが可能である。本発明は、ゴルフクラブのシャフトに特徴があり、ウッド型のゴルフクラブ以外にも、アイアン型のゴルフクラブや、パターのシャフトについても適用することが可能である。
また、上記した構成については、ゴルフクラブのシャフト以外に、釣竿や竿受け、玉網等の管状体についても適用することも可能である。 Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments and can be variously modified. The present invention is characterized by a shaft of a golf club, and can be applied not only to a wood-type golf club but also to an iron-type golf club and a putter shaft.
Further, the above configuration can be applied not only to the shaft of a golf club but also to a tubular body such as a fishing rod, a rod holder, and a ball net.

１ ゴルフクラブ
１０ シャフト
１０Ａ 本体層
１０Ｂ 補強層
１０Ｃ 外観露出層
１１〜１５ 本体シート
１７ 補強シート
２１〜２４ 外観シート
３０ ヘッド
４０ グリップ
５０ 芯金 1 Golf club 10 Shaft 10A Body layer 10B Reinforcement layer 10C Appearance exposed layer 11 to 15 Body sheet 17 Reinforcement sheet 21 to 24 Appearance sheet 30 Head 40 Grip 50 Core metal

Claims (8)

繊維強化樹脂製のシャフトを備えたゴルフクラブにおいて、
前記シャフトは、径方向内側に配設され高温硬化材料で形成される本体層と、その径方向外側に配設され低温硬化材料で形成される外観露出層と、を有することを特徴とするゴルフクラブ。 In a golf club equipped with a shaft made of fiber reinforced plastic,
The shaft is characterized by having a main body layer arranged radially inside and formed of a high temperature curing material, and an externally exposed layer arranged radially outside and formed of a low temperature curing material. club. 前記本体層は、表面が研磨されており、その研磨部分に前記外観露出層が配設されていることを特徴とする請求項１に記載のゴルフクラブ。 The golf club according to claim 1, wherein the surface of the main body layer is polished, and the externally exposed layer is disposed on the polished portion. 前記外観露出層は、前記本体層よりも肉厚が薄いことを特徴とする請求項１又は２に記載のゴルフクラブ。 The golf club according to claim 1 or 2, wherein the externally exposed layer is thinner than the main body layer. 前記外観露出層は、前記シャフトの全長に亘って配設されていることを特徴とする請求項１から３のいずれか１項に記載のゴルフクラブ。 The golf club according to any one of claims 1 to 3, wherein the appearance exposed layer is arranged over the entire length of the shaft. スチール製の管状体の少なくとも一部の領域に巻回され、繊維強化樹脂製のプリプレグシートによって形成される外観露出層を備えたシャフトを有するゴルフクラブであり、
前記スチール製の管状体は、前記プリプレグシートが巻回される部分の表面が粗面化されていることを特徴とするゴルフクラブ。 A golf club with a shaft that is wound around at least a portion of a steel tubular body and has an externally exposed layer formed by a fiber reinforced resin prepreg sheet.
The steel tubular body is a golf club characterized in that the surface of a portion around which the prepreg sheet is wound is roughened. 前記スチール製の管状体の粗面化部分は、Ｒａ値が０．２５以上に粗面化されていることを特徴とする請求項５に記載のゴルフクラブ。 The golf club according to claim 5, wherein the roughened portion of the steel tubular body is roughened to a Ra value of 0.25 or more. 高温硬化材料製のプリプレグシートを芯金に巻回し、加熱することで管状の本体層を形成する第１成型工程と、
前記第１成型工程によって形成された本体層の表面を研磨する研磨工程と、
前記表面が研磨された本体層に、低温硬化材料製のプリプレグシートを巻回し、加熱することで外観露出層を形成する第２成型工程と、
を有することを特徴とするゴルフクラブのシャフトの製造方法。 The first molding process, in which a prepreg sheet made of a high-temperature curing material is wound around a core metal and heated to form a tubular body layer,
A polishing step of polishing the surface of the main body layer formed by the first molding step, and
A second molding step of winding a prepreg sheet made of a low-temperature curing material around the main body layer whose surface has been polished and heating it to form an exposed appearance layer.
A method for manufacturing a shaft of a golf club, which comprises. 前記研磨工程の後、前記管状の本体層を芯金に外嵌して、前記低温硬化材料製のプリプレグシートを巻回することを特徴とする請求項７に記載のゴルフクラブのシャフトの製造方法。 The method for manufacturing a golf club shaft according to claim 7, wherein after the polishing step, the tubular main body layer is fitted onto a core metal and a prepreg sheet made of the low-temperature curing material is wound around the core metal. ..
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