JP2009119001A - Golf club head, method for manufacturing the same, and golf club - Google Patents

Abstract

A golf club head having a metal layer of various forms and materials formed while suppressing the influence of heat on the golf club head, a manufacturing method thereof, and a golf club provided with the head are provided.
A golf club head includes a head body having a metal outer shell structure, and first and second metal layers 21 and 22 formed on an inner surface 20a of a face part 20 which is a partial surface of the head body. With. The first metal layer 21 is formed in close contact with the inner surface 20a so as to locally bite into the inner surface 20a of the face part 20 without interposing a deteriorated layer caused by heat between the first metal layer 21 and the head body. ing.
[Selection] Figure 2

Description

  The present invention relates to a golf club head, a manufacturing method thereof, and a golf club, and more particularly to a golf club head including a metal layer formed on the head surface, a manufacturing method thereof, and a golf club including the head.

  In several patent documents including JP-A-8-52243, it has been proposed to form a coating layer on the outer surface of a golf club head by low temperature spraying.

  In the above-mentioned JP-A-8-52243, a surface subjected to friction is formed into a rough surface for freedom of design, improvement in strength, and ease of manufacture, and the rough surface is formed at about 40 ° C. to 100 ° C. It is described that a coating layer of a surface metal is formed by low temperature thermal spraying.

  Japanese Patent Laid-Open No. 2002-325869 discloses that a coating layer is formed on a striking surface of a golf club head by low-temperature spraying of a cemented carbide at around 40 ° C. in order to increase the tensile strength of the face and increase the hardness. It is described to do.

Further, JP 2002-360748 A discloses a golf club head in which a face is formed of a perforated plate body and a covering body covering at least one surface thereof. It is described that it is formed by thermal spraying so that the perforated plate as a base of the face can be easily reinforced and the holes can be closed.
JP-A-8-52243 JP 2002-325869 A JP 2002-360748 A

  In the low temperature spraying described in each of the above patent documents, the metal material is once heated to the melting point or higher and then melted, and then sprayed at the above-mentioned temperature. It will have an effect. In particular, when the coating layer is formed thick, the thermal effect becomes significant, and there is a concern that the characteristics may deteriorate due to, for example, alteration of the portion where the coating layer is formed. Moreover, in order to reduce such an undesirable thermal effect, a process such as a separate heat treatment may be required.

  Therefore, with the methods described in the above patent documents, it has been difficult to form metal layers of various forms and materials on the surface of the golf club head while suppressing the thermal influence on the golf club head.

  Accordingly, the present invention provides a golf club head having a metal layer of various forms and materials formed while suppressing the thermal influence on the golf club head, a method for manufacturing the same, and a golf club provided with the head. Objective.

  A golf club head according to the present invention includes a head body having a metal outer shell structure, and a metal layer formed on a part of the surface of the head body. The metal layer is formed in close contact with the partial surface of the head body so as to locally penetrate the partial surface of the head body without interposing a deteriorated layer caused by heat between the metal layer and the head body. Here, the above-mentioned “metal outer shell structure” means that the outer shell is formed of a material mainly composed of metal, and may include a non-metal portion. In addition, in the present specification, the above-mentioned “modified layer” refers to the formation of a compound in which at least one of the metal layer and the head body is denatured or fragile due to the fact that the metal layer is formed using a molten material. The layer formed by doing so.

  The metal layer may be a laminate of a plurality of metal layers of the same material, or may be a laminate of a plurality of metal layers of different materials. For example, it may include a first metal layer formed on the surface of the head body and a second metal layer formed on the surface of the first metal layer and made of a material different from the first metal layer. Moreover, you may change the thickness of a metal layer locally or over the whole metal layer.

  The head main body may include, for example, an internal space and a face portion. In this case, the metal layer can be formed on the inner surface which is the surface facing the internal space in the face portion. The head body may include an internal space and a sole portion. In this case, the metal layer may be formed on an inner surface that is a surface of the sole portion facing the internal space. it can. Furthermore, you may form the said metal layer on the outer side surface which is the surface of the side which faces outside in the said sole part. Further, the head body may include a concave portion on the surface. In this case, the metal layer can be formed in the recess.

  In another aspect, the golf club head according to the present invention includes a head body having a metal outer shell structure, and a composite material layer formed on a partial surface of the head body and formed of a composite material of metal and ceramic. The composite material layer is formed in close contact with the partial surface of the head body so as to locally penetrate the partial surface of the head body without interposing a denatured layer caused by heat between the head body and the composite material layer. Yes.

  A golf club according to the present invention includes a golf club head having any one of the above-described configurations.

  The golf club head manufacturing method according to the present invention includes the following steps. At least a part of the head body having a metal outer shell structure is produced. Using the working fluid that is at a temperature lower than the melting point or softening temperature of the metal powder and flowing at supersonic speed, the metal powder in the solid state is accelerated and sprayed onto a part of the surface of the head body. A metal layer is formed on the surface. The head body may be composed of one part or a plurality of parts. The metal powder is preferably sprayed from a position close to a part of the surface of the head body.

  In the golf club head and the golf club of the present invention, since the metal layer is formed between the head main body without an altered layer caused by heat, the golf club head has a thermal effect due to the formation of the metal layer. Is suppressed, and the desired characteristics are obtained. The metal layer can be formed by the following method, for example. Therefore, it is possible to form metal layers of various forms and materials while suppressing the thermal influence on the golf club head.

  According to the golf club head manufacturing method of the present invention, the above-mentioned head is obtained by accelerating the solid-state metal powder using a working fluid that is at a temperature lower than the melting point or softening temperature of the metal powder and that flows at supersonic speed. Since the metal layer is formed on the partial surface of the head body by spraying on the partial surface of the main body, the metal layers of various forms and materials are formed while suppressing the thermal influence on the golf club head. be able to.

  According to the present invention, since the metal layers of various forms and materials can be formed on the surface of the golf club head as described above, the golf club head adopts the configuration of each part that could not be expected in the past. The characteristics can be improved.

Hereinafter, some embodiments of the present invention will be described with reference to FIGS. A golf club according to an embodiment of the present invention includes a golf club head, a shaft, and a grip, which will be described later. In addition, a well-known thing is employable as a shaft and a grip. The present invention is useful for wood golf clubs, but can also be applied to iron golf clubs and putters.
(Embodiment 1)
FIG. 1 is an exploded perspective view of a golf club head 1 according to Embodiment 1 of the present invention. As shown in FIG. 1, a golf club head 1 according to the first embodiment includes a head body having a metal outer shell structure. As a material for the head body, various metal materials such as titanium and titanium alloys can be used.

  In the example of FIG. 1, the golf club head 1 having a hollow structure maintaining the internal space is illustrated, but the internal space may be filled with a substance such as a foam material. It is also possible to produce the golf club head 1 by combining a metal member and a non-metal member.

  The head body includes a face portion 2, a sole portion 4, a crown portion 5, and a side portion 6 that connects the sole portion 4 and the crown portion 5. In the example of FIG. 1, the head body is formed by combining a plurality of parts. Specifically, the head main body includes a head main body base constituting the main part of the head main body, and a face part 20 fixed to the head main body base.

  The head main body shown in FIG. 1 has an opening 3 at the center of the face 2, and a face part 20 that forms the center of the face 2 is fixed to the opening 3. Note that the position and number of the openings 3 may be changed, or the head main body may be made of a head main body base and two or more types of parts attached to the head main body base. For example, the head body base has an opening at the center of the crown 5 and the periphery of the crown 5, the face 2, the side 6, and the sole 4 are integrally molded, It can be considered that the face portion 2 and the crown portion 5 each have an opening at the center thereof, and the peripheral portions of the face portion 2 and the crown portion 5, the side portion 6, and the sole portion 4 are integrally formed. It is also conceivable to provide one or a plurality of openings in at least one of the face part 2, the sole part 4, the crown part 5 and the side part 6.

  Examples of the material of the head main body base include a titanium alloy (for example, αβ titanium alloy: Ti-6Al-4V) which is a material that can be cast. On the other hand, examples of the metal part that is mounted so as to close the opening of the head main body base include a metal plate made of a titanium alloy, a magnesium alloy, or the like. Further, as the non-metallic part that is mounted so as to close the opening of the head main body base part, a non-metallic plate material such as FRP (Fiber Reinforced Plastics) can be used.

  In the first embodiment, αβ titanium alloy (Ti-6Al-4V) or β-based titanium alloy (Ti-22V-4Al, Ti-15Mo-5Zr-4V-4Al, etc.) is used as the material of the face part 20. It is conceivable to join the face part 20 to the head main body base by welding or the like. The face part 20 can be produced by forging or rolling.

  When the opening is provided in the crown portion 5, it is conceivable that a crown part made of a metal material having a specific gravity lower than that of the head main body base is fixed to the head main body base by a technique such as adhesion. It is also conceivable that the crown part is made of a non-metallic material such as FRP having a specific gravity lower than that of the head main body base. In this way, the center of gravity of the head can be lowered by making the crown part from a material having a low specific gravity. In addition, you may use the board | plate material which consists of the material similar to a head main body base as a crown part.

  Even when openings are provided in the side portion 6 and the sole portion 4, parts made of a material having a specific gravity different from that of the head main body base are fixed to the head main body base so as to adjust the mass distribution of the golf club head. Also good.

  FIG. 2 shows one structural example of the face part 20 according to the first embodiment, and FIG. 3 shows another structural example of the face part 20.

  As shown in FIGS. 2 and 3, in the first embodiment, a metal layer is formed on a partial surface of a head body having a metal outer shell structure. More specifically, a plurality of metal layers are formed on the surface of the face part 20 constituting a part of the head body and on the inner surface 20a facing the inner space side of the head body.

  The face part 20 shown in FIG. 2 is manufactured by pressing a rolled αβ titanium alloy (Ti-6Al-4V) plate material to obtain a plate material having a predetermined shape, and then bending the plate material. be able to.

  On the inner surface 20a of the face part 20, a first metal layer 21 having an outer shape along the outer periphery of the face part 20 is formed. In the example of FIG. 2, the outer peripheral edge of the face part 20 and the outer peripheral edge of the first metal layer 21 are separated from each other. This separation amount can be arbitrarily set.

  The first metal layer 21 is formed in close contact with the inner surface 20a so as to locally eat into the inner surface 20a without an alteration layer caused by heat between the face part 20. Yes.

  As described above, since the first metal layer 21 is formed between the head body and the altered layer caused by heat, the influence of heat on the face part 20 can be suppressed. Moreover, since the 1st metal layer 21 can be formed by spraying a metal material etc. as mentioned later, it can be made into various forms and materials. Therefore, it is possible to form a metal layer of a desired form and material on the surface of the golf club head 1 while suppressing the thermal influence on the golf club head 1. Thereby, rebound characteristics and durability can be controlled as desired.

  The first metal layer 21 is made of a material different from the material of the face part 20, for example, pure titanium. Although the thickness of the 1st metal layer 21 can be set arbitrarily, in this Embodiment 1, the thickness of the 1st metal layer 21 shall be about 0.5 mm. On the other hand, the thickness of the face part 20 may be about 2 mm.

  A second metal layer 22 is formed on the first metal layer 21. The outer shape of the second metal layer 22 is substantially elliptical in the example of FIG. 2, but may be any shape. The second metal layer 22 is also made of pure titanium, which is the same material as the first metal layer 21, and has a thickness of about 0.5 mm. The interface state between the second metal layer 22 and the first metal layer 21 is also the same as the interface state between the face part 20 and the first metal layer 21.

  As described above, by forming the first metal layer 21 and the second metal layer 22 on the inner surface 20a of the face part 20, the thickness of the face part 20 is gradually increased toward the central part thereof. be able to. That is, a state equivalent to the case where the thickness of the face part 20 is increased stepwise by forging or the like can be realized. In addition, since the thickness of each metal layer can be changed with high accuracy and complexity, the rebound characteristics of the face portion 2 can be adjusted.

  In the example of FIG. 2, the material of the first metal layer 21 and the material of the second metal layer 22 are the same, but the material of the first metal layer 21 and the material of the second metal layer 22 are different. Also good. For example, the material of the first metal layer 21 can be pure titanium, and the material of the second metal layer 22 can be aluminum.

  In the first embodiment, the material of the face part 20 and the material of each metal layer are also different. However, by forming a metal layer of a different material on the face part 20 in this way, it has not been considered in the past. Such an extreme rigidity distribution of the face portion 2 can also be realized. As a result, the rebound characteristics of the face portion 2 can be variously controlled.

  In the example of FIG. 2, the thickness of the first metal layer 21 and the thickness of the second metal layer 22 are the same, but the thickness of the first metal layer 21 and the thickness of the second metal layer 22 are different. Also good. For example, the thickness of the first metal layer 21 is reduced to about 0.2 mm to 0.3 mm, and the thickness of the second metal layer 22 is set to about 0.7 mm to 0.8 mm so as to be thicker than the thickness of the first metal layer 21. It is possible.

  Further, the first metal layer 21 and the second metal layer 22 may be formed on the inner surface 20a so as to be in contact with the inner surface 20a of the face part 20 without being laminated. For example, the 1st metal layer 21 and the 2nd metal layer 22 may be arrange | positioned in the position which adjoins, and you may form these apart.

  Next, a modification of the first embodiment will be described with reference to FIG. As shown in FIG. 3, in this modification, three metal layers are formed. More specifically, first to third metal layers 21 to 23 having a substantially circular outer shape are formed on the central portion of the inner surface 20a of the face part 20. The area of the region surrounded by the outer shapes of the first to third metal layers 21 to 23 decreases in the order of the first to third metal layers 21 to 23. The first to third metal layers 21 to 23 are also made of pure titanium having a thickness of about 0.5 mm. Also in the case of the first to third metal layers 21 to 23, the material and thickness of each layer may be different. For example, the first metal layer 21 can be made of titanium, the second metal layer 22 can be made of aluminum, and the third metal layer 23 can be made of copper.

  Next, a method for manufacturing the golf club head according to the first embodiment shown in FIG. 2 will be described.

  First, an αβ titanium alloy (Ti-6Al-4V) head body is manufactured by a known method such as casting. Further, as described above, after pressing the rolled αβ titanium alloy (Ti-6Al-4V) plate material to produce a plate material having a predetermined shape, the face member 20 is bent by bending the plate material. Make it. When a golf club head is manufactured by combining a plurality of parts, each part may be manufactured by an appropriate known method other than the above, such as the above method or forging.

  Then, first and second metal layers 21 and 22 made of pure titanium are sequentially formed on the inner surface 20a of the face part 20 to a thickness of 0.5 mm. In order to form these metal layers, for example, an apparatus having a spray head as shown in FIG. 7 may be used. This apparatus includes a heating unit (heater) 12, a metal powder supply unit 13, and a nozzle unit 14 shown in FIG.

A high-pressure working gas such as He or N ₂ (for example, about 0.5 to 3.0 MPa) is supplied to the spray head from a working gas supply source (not shown), and the heating unit 12 has a temperature of about 200 ° C. to 300 ° C. Heat to (lower than melting point or softening temperature). The heated high-pressure working gas is accelerated by the nozzle portion 14 to supersonic speed. Then, pure titanium powder (for example, a particle size of about 10 μm or less) as a metal powder material is introduced into the working gas accelerated at supersonic speed from the metal powder supply unit 13, and this pure titanium powder is accelerated to be a target. Spray onto the inner surface 20a of the face part 20.

  At this time, the speed of the pure titanium powder is very high as described above, and it does not melt and remains in a solid state, so that the pure titanium powder strongly collides with the inner surface 20a of the face part 20 without being altered by heat. Then, it is plastically deformed in a state of being reduced to the surface.

  Thereby, the first metal layer 21, which is a dense layer of pure titanium, can be formed on the inner surface 20 a of the face part 20. In addition, since the first metal layer 21 is formed in a state of locally entering the surface of the face part 20 (throwing effect), the contact area between the first metal layer 21 and the face part 20 can be increased. In addition, the adhesion strength between the first metal layer 21 and the face part 20 can be increased.

  When the first metal layer 21 is formed, the inner surface 20a of the face part 20 may be roughened by blasting in advance. In this case, the contact area between the first metal layer 21 and the face part 20 can be further increased, and the adhesion strength between the first metal layer 21 and the face part 20 can be improved. Therefore, the roughening treatment as described above is effective when a metal layer is formed on a portion where the impact and deformation amount when the ball is hit, such as the face part 20, is large.

  Further, since the first metal layer 21 is formed by spraying the pure titanium powder on the inner surface 20a of the face part 20 in a solid state without melting, the altered layer caused by heat between the face part 20 and the like The formation of a fragile compound can also be effectively suppressed.

  In addition, the thickness of the first metal layer 21 can be easily controlled by controlling the speed and time for spraying the material. Furthermore, the thickness of the first metal layer 21 can be extremely changed, and a thickness distribution (uneven thickness) that is considered impossible by forging can be obtained. For example, the planar shape of the first metal layer 21 can be changed to an arbitrary shape only by changing the shape of the mask member.

  Furthermore, the material of the first metal layer 21 can be selected regardless of the material of the face part 20. For example, the combination of the face part 20 and the first metal layer 21 can be arbitrarily selected from iron-based materials, titanium, aluminum, magnesium, copper, and the like.

  In addition, for example, when the thickness of a part of the face part 20 is thinner than the design value, the thickness of the face part 20 is formed by forming a metal layer such as the first metal layer 21 in a thin part. Can be adapted to the design value. That is, when the local thickness of each part of the golf club head becomes thinner than the design value, it can be supplemented. As a result, variation in the coefficient of restitution of mass-produced products can be suppressed, the defect rate can be reduced, and costs can be reduced.

  Here, in order to make the outer peripheral shape of the first metal layer 21 as shown in FIG. 2, an annular mask member is bonded onto the inner surface 20a of the face part 20, and the inner surface 20a of the face part 20 is bonded. Pure titanium powder may be sprayed while being selectively exposed.

  Further, it is preferable to perform the above-described spraying of pure titanium powder in a state where the spray head is brought close to the inner surface 20 a of the face part 20. For example, it is preferable to spray the pure titanium powder in a state where the inner surface 20a of the face part 20 is separated from the center of the tip opening of the nozzle part 14 by about 15 mm.

  When the first metal layer 21 is formed over a relatively wide range, the first metal layer 21 is formed while moving the spray head. The moving speed of the spray head at that time is, for example, 100 mm / s. A moderate speed is sufficient.

  The second metal layer 22 is formed after the first metal layer 21 is formed as described above. The second metal layer 22 is basically the same as the case of the first metal layer 21. It can be formed by a technique.

  That is, after the formation of the first metal layer 21, the mask for forming the first metal layer 21 is removed, and the annular mask for forming the second metal layer 22 is bonded onto the inner surface 20 a of the face part 20. Then, the second metal layer 22 may be formed by the same method as that for the first metal layer 21. The moving speed of the spray head at that time can be arbitrarily set in consideration of the thickness.

After the metal layer is formed on the surface of the face part 20 as described above, the face part 20 is heat-treated as necessary. Thereafter, the head body and the face part 20 are joined. In the case of the present embodiment, the head body and the face part 20 are joined by welding. Thereafter, the golf club head 1 can be manufactured through various processes such as surface treatment and decoration. After the golf club head 1 is manufactured, the golf club head 1 can be combined with the shaft and grip to manufacture a golf club.
(Embodiment 2)
Next, Embodiment 2 of the present invention will be described with reference to FIG. FIG. 4 is a cross-sectional view of the golf club head 1 according to the second embodiment.

  In the second embodiment, one or more metal layers are formed on at least a part of the outer surface of the golf club head 1. As the material of the metal layer, the same material as in the first embodiment can be used. Thus, by forming a metal layer on the outer surface of the golf club head 1, reinforcement of each part and adjustment of mass distribution can be performed, but the shape correction and appearance correction of the golf club head 1 can also be performed.

  In the example of FIG. 4, the metal layer 7 is selectively formed on the bottom surface of the sole portion 4, and the thickness of the metal layer 7 is increased as the distance from the face portion increases. By forming such a metal layer 7, the loft angle and lie angle of the golf club head 1 can be adjusted.

  The metal layer 7 can also be formed on the face surface, the outer surface of the crown portion 5, and the outer surface of the side portion 6. By forming the metal layer 7 on the face surface, the apparent face angle can be adjusted, and by forming the metal layer 7 on the outer surface of the crown portion 5 or the side portion 6, various changes in appearance can be achieved. Can be granted.

  In addition, when a defective portion such as a pinhole is present on the outer surface of the golf club head 1, the metal layer 7 is formed so as to cover the portion, and thereafter, the metal layer 7 is subjected to a surface treatment such as polishing. Is also possible. In this case, a defective part such as a pinhole can be made inconspicuous, and the defect rate can be reduced. Moreover, even when the head body is produced by casting and the casting surface is in a bad state, the appearance defect is reduced by forming the metal layer 7 so as to cover the part and applying an appropriate surface treatment. You can also

  Further, for example, the gap (recess) between the parts of the golf club head 1 such as a gap between the face part of the titanium face iron and the head body is not conspicuous, and the metal layer 7 is formed in the gap (recess). It is also conceivable that after forming the metal layer 7, the metal layer 7 is embedded in the gap (recessed portion) by performing a polishing process. In this case, in addition to reducing the appearance defect, the appearance can also be improved.

Further, when the metal layer 7 is formed on at least one of the bottom surface of the sole portion 4 and the outer surface of the crown portion 5, the rigidity of the sole portion 4 and the crown portion 5 can be adjusted. The hitting sound can also be improved. For example, it is conceivable to form the rib-like or belt-like metal layer 7 on the bottom surface of the sole portion 4 and on the outer surface of the crown portion 5. In this case, the hitting sound can be finely adjusted by appropriately adjusting the material, width, length, height, and the like of the metal layer 7.
(Embodiment 3)
Next, Embodiment 3 of the present invention will be described with reference to FIG. 5 and FIG. FIG. 5 is a partial cross-sectional view of the golf club head 1 according to the third embodiment, and FIG. 6 is a partial cross-sectional view of the golf club head 1 according to a modification of the third embodiment.

  In the third embodiment, a metal layer is formed on at least one of the outer surface and the inner surface of the golf club head 1. At this time, the metal layer can be formed with high molding accuracy by forming the metal layer by the above-described method. Thereby, in addition to being able to reinforce the golf club head 1 in the portion where the metal layer is formed as in the case of each of the above-described embodiments, the mass of the golf club head 1 can be adjusted.

  The thickness of the metal layer can theoretically be as thin as several μm to 5 mm, can be relatively thick as 5 to 50 mm, or can be considerably thick as 50 to 100 mm or more. By forming the metal layer relatively thick, the metal layer can effectively function as a weight portion. In this case, there is no need to separately attach a weight member to the golf club head 1 as in the prior art, and the weight portion can be provided much more easily than in the prior art.

  Further, since the metal layer only needs to be formed on the surface including the inner surface of the golf club head, the metal layer can be easily formed on any of the sole portion 4, the crown portion 5, and the side portion 6. That is, the mass adjusting portion of the golf club head 1 is easily formed in an arbitrary position (single or plural) on the surface of the golf club head 1 by a necessary amount and number (single or plural). Can do.

  In the example of FIG. 5, a recess 8 is provided on the surface of the sole portion 4, and a metal layer 10 is formed in the recess 8. The center of gravity height of the golf club head 1 can be controlled by the amount of the metal layer 10 laminated. Further, by disposing the concave portion 8 on the back portion side, which is the side away from the face portion, the depth of the center of gravity can be controlled by the amount of the metal layer 10 stacked, and for example, the ball trajectory can be increased.

  As a material of the metal layer 10, it is preferable to use a material having a specific gravity larger than that of the material constituting the head body. For example, when the head main body is made of a titanium alloy such as αβ titanium alloy (Ti-6Al-4V), the metal layer 10 may be made of a material having a relatively large specific gravity such as copper. Thereby, the position of the center of gravity of the golf club head 1 can be easily adjusted.

  As the material of the metal layer 10, various materials such as iron and nickel can be considered besides copper. Also, the weight portion can be formed by combining various metal materials. For example, combinations of various different materials such as iron and titanium, nickel and copper, and iron and copper are also conceivable.

  It is possible to attach a cover plate 9 rich in design to the concave portion 8, thereby improving the appearance of the design and preventing foreign matter from entering the concave portion 8. . When the cover plate 9 is mounted, it is preferable to provide a step portion (support portion) capable of supporting the cover plate 9 on the inner wall of the recess 8 as shown in FIG. Thereby, the cover plate 9 can be mounted on the golf club head 1 in a stable state.

  As shown in FIG. 6, a block-shaped metal layer 11 may be formed on the inner surface 4 a that is the surface of the sole portion 4 that faces the internal space of the golf club head 1. The thickness of the metal layer 11 is, for example, about 10 to 20 mm. By setting it as such thickness, the metal layer 11 can be functioned effectively as a weight part.

  A plate-like or rib-like metal layer 11 may be formed on the inner surface 4a of the sole portion 4. In this case, a necessary mass can be ensured without making the metal layer 11 extremely thick. By adopting the metal layer 11 according to the present embodiment, when the metal layer 11 is arranged on the sole surface as a weight having an arbitrary mass, the metal layer 11 is arranged at an arbitrary position without being affected by the step difference of the sole surface. be able to.

  Further, the metal layer 11 functioning as a weight portion may be formed in any form on the heel portion side of the golf club head 1. Thereby, the position of the center of gravity of the golf club head 1 can be shifted to the heel portion side, the golf club head can be easily returned at the time of impact, and a golf club with good catching of the ball can be obtained.

  Further, contrary to the above, the metal layer 11 functioning as a weight portion may be formed in any form on the toe portion side of the golf club head 1. In this case, the position of the center of gravity of the golf club head 1 can be shifted to the toe side, and the golf club head can be made difficult to return upon impact. Thereby, a golf club useful for a player whose golf club head easily returns can be obtained.

  Furthermore, the metal layer 11 functioning as a weight portion may be formed in an arbitrary form in at least two places of the sole portion 4, the crown portion 5, and the side portion 6 (including the back portion, the heel portion, and the toe portion).

  In each of the above-described embodiments, the case where the metal layer is formed on a part of the surface of the head body having a metal outer shell structure has been described, but the composite material layer composed of a composite material of a metal and a different material, Forming on a part of the surface of the head body is also conceivable. Specifically, for example, a composite material layer formed of a composite material of metal and ceramic may be formed on a partial surface of the head body. In this case, the composite material layer is formed in close contact with the partial surface of the head body so as to locally penetrate the partial surface of the head body without interposing a denatured layer caused by heat between the head body and the head. Is done. As the composite material, for example, WC—Co based powder, Al—SiC based powder, and Cu—SiC based powder can be used.

  Although the embodiments of the present invention have been described as described above, it is also planned from the beginning to combine the configurations of the above-described embodiments as appropriate. Further, not all the configurations in the above-described embodiment are essential.

  Furthermore, it should be thought that embodiment disclosed this time is an illustration in all the points, and is not restrictive. The scope of the present invention is defined by the terms of the claims, and includes meanings equivalent to the terms of the claims and all modifications within the scope.

1 is an exploded perspective view of a golf club head in Embodiment 1 of the present invention. FIG. 3 is a perspective view showing face parts in the first embodiment. It is a perspective view which shows the modification of the face part shown in FIG. It is a fragmentary sectional view of the golf club head in Embodiment 2 of the present invention. It is a fragmentary sectional view of the golf club head in Embodiment 3 of the present invention. FIG. 6 is a partial cross-sectional view showing a modified example of the structure shown in FIG. 5. It is a cross-sectional schematic diagram which shows a part of formation apparatus of a metal layer.

Explanation of symbols

  1 golf club head, 2 face part, 3 opening part, 4 sole part, 4a, 20a inner surface, 5 crown part, 6 side part, 7, 10, 11 metal layer, 8 recess, 9 cover plate, 12 heating part, 13 Metal powder supply part, 14 Nozzle part, 20 Face parts, 21 1st metal layer, 22 2nd metal layer, 23 3rd metal layer.

Claims (10)

A metal outer shell head body;
A metal layer (7, 10, 11, 21, 22, 23) formed on a part of the surface of the head body,
The metal layer (7, 10, 11, 21, 22, 23) locally bites into a part of the surface of the head body without interposing a deteriorated layer caused by heat between the head body. Thus, the golf club head is formed in close contact with the partial surface.   The metal layer (7, 10, 11, 21, 22, 23) is formed on the first metal layer (21) formed on the surface of the head body and on the surface of the first metal layer (21). The golf club head according to claim 1, further comprising a second metal layer (22) made of a material different from that of the first metal layer (21).   The golf club head according to claim 1, wherein a thickness of the metal layer (7, 10, 11, 21, 22, 23) is changed. The head body includes an internal space and a face portion (2),
2. The metal layer (7, 10, 11, 21, 22, 23) is formed on an inner surface (20 a) that is a surface facing the inner space in the face portion (2). 4. The golf club head according to any one of 3. The head body includes an internal space and a sole portion (4),
2. The metal layer (7, 10, 11, 21, 22, 23) is formed on an inner surface (4 a) that is a surface facing the inner space in the sole portion (4). 5. The golf club head according to any one of 4 above. The head body includes a sole portion (4),
The metal layer (7, 10, 11, 21, 22, 23) is formed on an outer surface that is a surface facing outward in the sole portion (4). The described golf club head. The head body includes a recess (8) on the surface,
The golf club head according to any one of claims 1 to 6, wherein the metal layer (7, 10, 11, 21, 22, 23) is formed in the recess (8). A metal outer shell head body;
A composite material layer formed of a composite material of metal and ceramic on a partial surface of the head body,
The composite material layer is formed in close contact with the partial surface of the head main body so as to locally penetrate the partial surface of the head main body without interposing a deteriorated layer caused by heat between the head main body. A golf club head.   A golf club comprising the golf club head according to claim 1. Producing at least a part of a head body having a metal outer shell structure;
By using a working fluid that is at a temperature lower than the melting point or softening temperature of the metal powder and flowing at supersonic speed, the metal powder in a solid state is accelerated and sprayed onto a partial surface of the head body. Forming a metal layer (7, 10, 11, 21, 22, 23) on the part surface;
A method of manufacturing a golf club head, comprising:

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