JP4882716B2 - Manufacturing method of golf club head - Google Patents

Description

  The present invention can prevent foreign matter such as water or dust from entering the head main body even when repeatedly impacted by hitting a golf ball, and can further prevent breakage of the golf club shaft. The present invention relates to a method for manufacturing a golf club head.

  Conventionally, a head body having an outer shell structure including a face portion, a sole portion, a crown portion, and a side portion having a face surface for hitting a golf ball, and a fixed fulcrum are provided inside the head body, and formed on the crown portion. There is a golf club head that protrudes from a neck hole portion and has a hosel portion to which a golf shaft is fixed, with a gap between the hosel portion and the neck hole portion. In a conventional golf club head, when a golf ball is hit, the loft angle can be increased to obtain a long flight distance.

However, in the conventional golf club head, there is a problem in that foreign matter such as water or dust may enter the head main body because there is a gap between the hosel portion and the neck hole portion.
Therefore, various golf club heads having a function of preventing entry of foreign matters such as water or dust into the head main body have been proposed (see Patent Documents 1 to 3).

In Patent Document 1, a crown portion, a face portion, and a sole portion are hollowed and integrally formed of a metal material (for example, titanium or a titanium alloy), and the crown is formed from the sole portion side inside the head body. The shaft tip support member separated from the crown portion is formed integrally with the sole portion toward the shaft insertion hole formed in the portion, and the base end portion of the shaft tip support member is formed in a plate shape. A metal hollow golf club head is disclosed in which the base end of the head body is disposed so that the head body can swing toward the face side and the back side.
In the metal hollow golf club head of Patent Document 1, a rubber-like elastic support member that elastically supports the shaft tip support member is provided at the peripheral edge portion of the shaft insertion hole formed in the crown portion.
Further, according to the metal hollow golf club head of Patent Document 1, it is possible to cover the gap between the shaft tip support member and the shaft insertion hole with the rubber-like elastic support member. As a result, it is possible to effectively prevent dust or water from entering the hollow portion of the head body, to prevent wind noise during swing, and to improve the feeling by improving the hitting sound. .

In Patent Document 2, a crown portion, a face portion, and a sole portion are hollowed and integrally formed from a metal material (for example, titanium or a titanium alloy), and the crown is formed from the sole portion side inside the head body. A shaft tip support member separated from the crown portion is formed integrally with the sole portion toward the shaft insertion hole formed in the portion, and foreign matter does not enter the hollow portion of the head body from the shaft insertion hole formed in the crown portion. The metal hollow golf club head configured as described above, wherein the shaft tip support member protrudes from the shaft insertion hole, and the flange portion covering the gap between the shaft insertion hole and the shaft tip support member is formed at the tip portion of the shaft tip support member Is disclosed.
Patent Document 2 also discloses a configuration in which the hollow portion of the head main body is filled with a waterproof filler that closes the shaft insertion hole.

  Further, in Patent Document 2, a crown portion, a face portion, and a sole portion are hollow and integrally formed of a metal material (for example, titanium or a titanium alloy), and the sole portion side is provided inside the head main body. From the shaft insertion hole formed in the crown portion toward the hollow portion of the head body, a shaft tip support member separated from the crown portion is formed integrally with the sole portion toward the shaft insertion hole formed in the crown portion. A metal hollow golf club head configured to prevent intrusion and having a rubber seal member interposed in a gap between a shaft supported by a shaft tip support member and a shaft insertion hole formed larger than the diameter of the shaft is disclosed. ing.

Further, Patent Document 2 discloses that a crown portion, a face portion, and a sole portion are hollow and integrally formed of a metal material (for example, titanium or a titanium alloy) inside the head main body, on the sole portion side. From the shaft insertion hole formed in the crown portion toward the hollow portion of the head body, a shaft tip support member separated from the crown portion is formed integrally with the sole portion toward the shaft insertion hole formed in the crown portion. There is also disclosed a metal hollow golf club head configured so as not to invade and in which an air bag for closing a shaft insertion hole is accommodated in a hollow portion of the head body.
In any of the metal hollow golf club heads disclosed in Patent Document 2, foreign matter such as dust or water is prevented from entering the hollow portion of the head body, and the shaft is in contact with the peripheral edge portion of the shaft insertion hole and scratched. It is possible to effectively prevent sticking, further prevent wind noise during swing, improve hitting sound, and improve feeling.

  In Patent Document 3, a crown portion and a face portion are integrally formed of a metal material (for example, titanium or a titanium alloy), and a sole portion is formed inside a hollow head body formed of a high specific gravity metal. The base end portion of the hollow cylindrical shaft tip support member formed integrally with the sole portion is sealed or opened toward the shaft insertion hole formed in the crown portion and separated from the crown portion. A metal hollow golf club head is disclosed in which a rubber-like elastic support member that elastically supports a shaft tip support member is interposed in a shaft insertion hole.

Patent Document 3 discloses a hollow head body in which a crown portion and a face portion are integrally formed of a metal material (for example, titanium or a titanium alloy) and a sole portion is formed of a high specific gravity metal. A shaft tip support member is formed on the inner surface of the sole portion, the base end portion being integrally formed with the sole portion, and a rod-shaped projection member into which the shaft tip is inserted, and the tip end side of the shaft tip support member is crowned Metal hollow golf club head formed toward the shaft insertion hole formed in the portion, separated from the crown portion, and having a rubber-like elastic support member for elastically supporting the shaft interposed in the shaft insertion hole Is disclosed.
In any of the metal hollow golf club heads disclosed in Patent Document 3, the shaft insertion hole formed in the crown portion does not directly contact the shaft and is provided with a rubber-like elastic support member. In addition, breakage of the shaft can be effectively prevented at the time of ball impact, and dust or water can be prevented from entering the hollow portion of the head body.

Japanese Patent No. 3501909 Japanese Patent No. 3565669 Japanese Patent No. 3611413

Each of the metal hollow golf club heads disclosed in Patent Documents 1 to 3 has a function of preventing entry of foreign matter such as water or dust into the head body.
However, the metal hollow golf club head disclosed in Patent Documents 1 to 3 has a function of preventing intrusion of foreign matters such as water or dust when repeatedly hit with a golf ball and repeatedly impacted. It cannot withstand and the sealing performance is not sufficient. For this reason, there is a problem that water or dust enters the head body.
For this reason, there is a need for further improvement at present, and there is a demand for a material that has sufficient airtightness and can prevent entry of water or dust even when repeatedly impacted by the impact of a golf ball. Yes.

  SUMMARY OF THE INVENTION An object of the present invention is to solve the problems of the prior art described above, and to prevent foreign matter such as water or dust from entering the head body even when the golf ball is repeatedly hit by impact. Further, it is an object of the present invention to provide a method for manufacturing a golf club head capable of preventing breakage of a golf club shaft.

  In order to achieve the above object, according to the present invention, an outer shell structure is constituted by a face portion having a face surface for hitting a golf ball, a sole portion, a crown portion and a side portion, and a neck hole portion is formed in the crown portion. A hollow head main body, a shaft fixing member formed with an opening to which a golf club shaft is attached, and a hosel part including a support member formed integrally with the shaft fixing member. The golf club head has the support member fixed inside the head body, the shaft fixing member protruding from the neck hole, and a gap between the shaft fixing member and the neck hole. The head main body and the hosel part are prepared, and the support member of the hosel part is used as the head. A step of fixing the inside of the body, a step of inserting an annular resin member through the support member of the hosel part into the head body, and a cylindrical shape in which a moisture-curable adhesive is applied to the surface Inserting an elastic member into the gap through the support member of the hosel part, and holding the head body at a predetermined temperature for a predetermined time with the crown part held downward And a step of melting the annular resin member and sealing the gap from the inside of the head body with a molten resin.

In the present invention, the resin member is made of a thermoplastic resin and preferably has a melting point of 50 ° C to 150 ° C.
Furthermore, in the present invention, the resin member is made of a thermoplastic resin, and the melt flow rate is preferably 100 to 400 g / 10 min at a temperature of 190 ° C. and a load of 2.16 kg.
Furthermore, in the present invention, the step of sealing the gap with the molten resin is preferably performed by holding the head body at a temperature of 110 to 150 ° C. for 0.5 to 2 hours.

Furthermore, in the present invention, the elastic member is preferably made of rubber or synthetic resin having a hardness of 40 to 90 in a JIS-A type hardness meter.
In the present invention, the elastic member contains a foamable resin.
Furthermore, in the present invention, the moisture curable adhesive is preferably an acrylic-modified silicone adhesive.

  According to the golf club head manufacturing method of the present invention, the outer shell structure is formed by the face portion, the sole portion, the crown portion, and the side portion having a face surface for hitting a golf ball, and the neck hole portion is formed in the crown portion. A hollow head main body, a shaft fixing member in which an opening to which a golf club shaft is attached is formed, and a hosel portion including a support member formed integrally with the shaft fixing member. When manufacturing a golf club head in which a member is fixed inside the head body and the shaft fixing member protrudes from the neck hole, and there is a gap between the shaft fixing member and the neck hole, A hosel part is prepared, a process of fixing the support member of the hosel part inside the head body, and an annular resin member Inserting through the support member of the hosel part into the head body, inserting a cylindrical elastic member coated with moisture-curing adhesive on the surface through the support member of the hosel part, and inserting into the gap; The head body is held at a predetermined temperature for a predetermined time while the head body is held on the lower side, the annular resin member is melted, and the gap is sealed from the inside of the head body with the molten resin. And sealing the gap with a cylindrical elastic member from the crown side, and sealing with a molten resin obtained by melting an annular resin member from the inside of the head body. To do. In addition, the elastic member sealed from the crown side is bonded using a moisture curable adhesive, and moisture from the outside is used for bonding with the moisture curable adhesive, so that moisture penetrates into the head body. Can be prevented. As described above, since the gap can be sealed from both the crown portion side and the inner side of the head body, high sealing performance can be obtained, and foreign matter such as water or dust can be prevented from entering from the gap. be able to.

Further, according to the golf club head according to the golf club head manufacturing method of the present invention, although the elastic member is provided in the gap, even when the head body and the hosel part move relatively when the golf ball is hit, Following this movement, the elastic member is elastically deformed and does not hinder the relative movement between the head body and the hosel part. For this reason, the rotation of the head main body in a direction in which the loft angle of the face portion is increased is allowed. This increases the launch angle of the hit golf ball. Furthermore, rotation of the head body in the direction in which the loft angle of the face portion is increased causes the golf ball to rotate in the direction of rotation opposite to the backspin, thereby reducing the spin rate. That is, the spin is reduced. In this way, high launch and low spin are realized, and excellent impact performance with respect to flight distance and the like is obtained.
Further, even when an impact force is applied to the hosel portion when the golf ball is hit, the impact force is absorbed by the elastic member. Thereby, breakage of the golf club shaft at the time of hitting the golf ball can be prevented.

  As described above, according to the golf club head manufacturing method of the present invention, even when the impact of the golf ball is repeatedly received while satisfying the impact performance of the golf club head, water or dust is contained in the head body. Thus, it is possible to obtain a golf club head capable of preventing the foreign matter from entering and further preventing breakage of the golf club shaft.

Hereinafter, a method for manufacturing a golf club head of the present invention will be described in detail based on preferred embodiments shown in the accompanying drawings.
FIG. 1A is a schematic perspective view showing a golf club having a golf club head obtained by the golf club head manufacturing method of the present invention, and FIG. 1B is a golf club head manufacturing method of the present invention. 1 is a schematic side view showing a golf club having an obtained golf club head. FIG. 2 is an enlarged partial cross-sectional view of a main part of the golf club head shown in FIGS. 1 (a) and 1 (b). In FIG. 1B, the golf club shaft 14 is not shown.

  As shown in FIG. 1A, a golf club 10 includes a golf club head 12, a socket (not shown), a golf club shaft 14, and a grip (not shown) obtained by the manufacturing method of the present invention. It is what has.

In addition, as shown in FIGS. 1A and 1B, the golf club head 12 has a head body 20 and a hosel portion 30. The golf club head 12 is a type of head generally called a wood type.
The head body 20 is a hollow structure and includes a face portion 22, a sole portion 24, a side portion 26, and a crown portion 28. In the head main body 20, the face portion 22 is joined to an opening 20c (see FIG. 3B) formed by joining the sole portion 24, the side portion 26, and the crown portion 28 to each other, thereby forming an outer shell structure. Has been.
Further, in the head main body 20, the sole portion 24 and the side portion 26 are integrally formed, and the other face portion 22 and crown portion 28 are separately formed in a plate shape.

The surface of the face portion 22 is a face surface 22a for hitting a golf ball. For example, three score lines L extending in the horizontal direction from the toe side to the heel side of the face surface 22a are formed in parallel. The face surface 22a is set to a predetermined loft angle.
The face portion 22 may have a flat plate shape or a shape generally called a cup face.
Further, a neck hole portion 28 a through which the hosel portion 30 passes is formed on the crown portion 28 on the side in contact with the face portion 22.
The neck hole portion 28 a can be inserted with a shaft fixing member 32 of the hosel portion 30 described later, and the neck hole portion 28 a has an inner diameter larger than an outer diameter of the shaft fixing member 32.
The face part 22, the sole part 24, the side part 26, and the crown part 28, which are constituent members of the head main body 20, are formed of a titanium alloy such as Ti-6Al-4V, for example.

The hosel portion 30 is for fixing the golf club shaft 14 to the golf club head 12 as shown in FIG.
As shown in FIG. 1B, the hosel portion 30 includes a columnar shaft fixing member 32 and a columnar support member 34.
The shaft fixing member 32 has an opening 32a to which the golf club shaft 14 is attached on one end side.
The support member 34 is formed continuously and integrally with the other end portion of the shaft fixing member 32. The support member 34 has a smaller diameter than the shaft fixing member 32.

The hosel portion 30 is configured such that the end portion of the support member 34 is erected at a predetermined position on the inner surface 24 a of the sole portion 24. A joint portion between the support member 34 and the inner surface 24a of the sole portion 24 serves as a fixed fulcrum 34a. Since the end portion of the support member 34 is bonded to the inner surface 24a of the sole portion 24, the axis (center axis) C of the hosel portion 30 is formed at a predetermined angle when bonded to the inner surface 24a. .
Further, the shaft fixing member 32 is inserted into the neck hole portion 28 a of the crown portion 28 and protrudes upward from the crown portion 28. A gap g is formed between the shaft fixing member 32 of the hosel portion 30 and the neck hole portion 28a.

  In the golf club 10 of the present embodiment, the golf club shaft 14 is attached to the opening 32a of the hosel portion 30 with its tip inserted and fixed with an adhesive or the like. The golf club shaft 14 has a grip (not shown) attached to the opposite side to which the golf club head 12 is attached.

  The golf club shaft 14 is not necessarily fixed directly to the golf club head 12 without using a socket. Some golf clubs have the golf club shaft fixed to the golf club head via the socket. is there. The socket is provided with an opening through which the golf club shaft 14 can be inserted.

In the golf club head 12 of the present embodiment, the gap g between the shaft fixing member 32 of the hosel portion 30 and the neck hole portion 28a is sealed from the crown portion 28 side and the inside 20a side of the head body 20. Yes.
As shown in FIGS. 1A and 1B, an elastic member 40 is provided from the crown portion 28 side. Specifically, as shown in FIG. 2, a cylindrical elastic member 40 having a surface 40a coated with a moisture curable adhesive (not shown) is passed through the shaft fixing member 32, and the elastic member 40 is embedded in the gap g. It is. The elastic member 40 seals the gap g from the crown portion 28 side. The elastic member 40 can be elastically deformed. For this reason, even when the head body 20 and the hosel part 30 move relative to each other when the golf ball is hit, the elastic member 40 is elastically deformed following the movement, and the head body 20 and the hosel part 30 are relatively Without disturbing the movement. As a result, the rotation of the head body 30 in a direction in which the loft angle of the face portion 22 is increased is allowed as will be described later.

In the present embodiment, the elastic member 40 is formed of rubber or synthetic resin. As this elastic member 40, for example, ethylene propylene rubber, acrylic rubber, nitrile butadiene rubber, or natural rubber is used. Furthermore, the elastic member 40 may be a foaming synthetic resin.
Further, the elastic member 40 preferably has a hardness (JIS K6253) measured by a JIS-A type hardness meter of 40 to 90.

In addition, it is preferable to use an acrylic modified silicone adhesive as the moisture curable adhesive. This is because the acrylic-modified silicone adhesive is excellent in weather resistance, so that deterioration of the adhesive force can be prevented over a long period of time even when exposed to sunlight from the crown portion 28 side.
In addition to the acrylic-modified silicone adhesive, a one-component urethane adhesive or an amine-protected epoxy adhesive may be used as the moisture curable adhesive.
Furthermore, after applying a primer to the surface 40a of the elastic member 40, a moisture curable adhesive may be applied to improve the adhesive strength of the moisture curable adhesive.

As shown in FIG. 2, a resin layer 42 is formed in the interior 20 a of the head body 20 so as to cover the shaft fixing member 32 and the elastic member 40. The resin layer 42 seals the gap g from the inside 20 a side of the head body 20.
The resin layer 42 has a film thickness of 0.1 to 3 mm, for example.
The resin layer 42 has a thickness D in the first direction which is a direction perpendicular to the inner peripheral surface (reference surface) with respect to the inner peripheral surface of the neck hole 28a as a reference surface (distance D = 7 mm), the thickness d of the resin layer 42 in the second direction orthogonal to the first direction. In addition, this resin layer 42 is formed with the molten resin by the manufacturing method mentioned later.

The resin layer 42 is made of a thermoplastic resin. As a thermoplastic resin, it is preferable that melting | fusing point is 50 to 150 degreeC.
The thermoplastic resin preferably has a melt flow rate of 100 to 400 g / 10 min at a temperature of 190 ° C. and a load of 2.16 kg.
More preferably, the thermoplastic resin has a melting point of 50 ° C. to 150 ° C. and a melt flow rate of 100 to 400 g / 10 min at a temperature of 190 ° C. and a load of 2.16 kg.
In this embodiment, as the thermoplastic resin, for example, bond first (trade name), polyolefin resin, polystyrene resin, polyurethane resin, polyether resin, vinyl acetate resin can be used. It is preferable to use an ethylene copolymer.

  Thus, in the golf club head 12 of the present embodiment, the gap g between the shaft fixing member 32 of the hosel portion 30 and the neck hole portion 28a is sealed from the crown portion 28 side by the elastic member 40, and the resin layer 42 is sealed from the inside 20 a side of the head main body 20.

In the golf club head 12 of the present embodiment, the hosel portion 30 includes a shaft fixing member 32 and a support member 34 having a diameter smaller than that of the shaft fixing member 32, and the support member 34 is an inner surface 24 a of the sole portion 24. Is standing. Since the support member 34 is thin, the support member 34 is more easily elastically deformed than the shaft fixing member 32 due to an impact when a golf ball is hit. Further, a gap g is provided between the shaft fixing member 32 of the hosel part 30 and the neck hole part 28a, and an elastic member 40 that can be deformed by impact when hit is provided. Thereby, when the support member 34 is elastically deformed by an impact at the time of hitting the golf ball, the rotation of the head body 20 in the direction R is allowed.
For this reason, in the golf club head 12 of the present embodiment, when the golf ball hits the face surface 22a when the golf ball is hit, the head body 20 rotates in the direction R, and the face surface of the head body 20 Since 22a is inclined toward the crown portion 28, the loft angle is increased. For this reason, the launch angle of the golf ball can be increased. Further, when the back body 20 rotates in the direction (direction R) in which the loft angle of the face surface 22a is increased, the golf ball is rotated in the rotation direction opposite to the back spin, and the spin amount is reduced. That is, the spin is reduced. Thereby, high launch and low spin can be realized. For this reason, the flight distance is improved with respect to the golf club head (golf club) in which the hosel portion is fixed to the sole portion and the crown portion, and excellent hitting performance with respect to the flight distance and the like can be obtained.

Further, in the golf club head 12 of the present embodiment, a gap g is provided between the shaft fixing member 32 of the hosel part 30 and the neck hole part 28a, and this gap g is formed by the elastic member 40 and the resin layer 42. It is sealed from the crown portion 28 side and the inside 20a side of the head body 20. Further, since the moisture curable adhesive is used for bonding the elastic member 40 sealed from the crown portion 28 side, moisture from the outside is used for bonding with the moisture curable adhesive. Thereby, the penetration | invasion of the water | moisture content to the inside 20a of the head main body 20 can be prevented.
As described above, since the gap g can be sealed from both sides from the crown portion 28 side and the inside 20a side of the head main body 20, high sealing performance can be obtained, and the inside of the head main body 20 can be obtained from the gap g. Intrusion of foreign matter such as water or dust into 20a can be prevented.

Further, the elastic member 40 is inserted into the gap g from the crown portion 28 side, and even if a large impact force acts on the hosel portion 30 when the golf ball is hit, the impact force is relieved by the elastic member 40. Further, breakage of the golf club shaft can be prevented.
As described above, in the golf club head 12 (golf club 10) of the present embodiment, even if the golf ball head 12 (golf club 10) satisfies a predetermined hitting performance and receives an impact at the time of hitting a golf ball, Intrusion of foreign matter such as dust can be prevented, and further, breakage of the golf club shaft can be prevented.

Next, the manufacturing method of the golf club head 12 of this embodiment is demonstrated.
FIG. 3A to FIG. 3C are schematic views showing the golf club head manufacturing method of the present embodiment in the order of steps. 4A and 4B are schematic views showing the golf club head manufacturing method of this embodiment in the order of steps from the next step of FIG. 3C. FIG. 5 is a schematic view showing a thermostatic device used in the golf club head manufacturing method of the present embodiment.

In the method of manufacturing the golf club head 12 of the present embodiment, first, the sole portion 24 and the side portion 26 constituting the head main body 20 are cut into a predetermined shape from, for example, a titanium plate or a titanium alloy plate, and the predetermined shape is obtained. After obtaining this member, the sole part 24 and the side part 26 are integrally formed by pressing.
The face portion 22 and the crown portion 28 are also obtained by cutting into a predetermined shape from a titanium plate or a titanium alloy plate and pressing it.
The crown portion 28 is formed with a neck hole portion 28a through which the shaft fixing member 32 of the hosel portion 30 is inserted.
In this manner, the face portion 22, the sole portion 24, the side portion 26, and the crown portion 28 that constitute the head body 20 are prepared.

Further, the hosel portion 30 is also obtained, for example, by forming a shaft fixing member 32, an opening 32a, and a support member 34 by performing turning and drilling using a bar.
Since the end portion of the support member 34 is joined to the inner surface 24a of the sole portion 24, when it is joined to the inner surface 24a, it is processed so that the axis C of the hosel becomes a predetermined angle.
The face part 22, the sole part 24, the side part 26 and the crown part 28, and the hosel part 30 may be manufactured individually, and the manufacturing order is not particularly limited.

Next, as shown in FIG. 3A, the support member 34 of the hosel part 30 is joined to the inner surface 24a of the sole part 24 by, for example, welding.
Next, as shown in FIG. 3 (b), the shaft fixing member 32 of the hosel part 30 is passed through the neck hole part 28a, and the opening part 20b of the side part 26 at the crown part 28 (see FIG. 3 (a)). The boundary portion between the crown portion 28 and the side portion 26 is joined by welding, for example.

  Next, the opening 20c formed by the sole portion 24, the side portion 26, and the crown portion 28 shown in FIG. 3B is closed by the face portion 22, and the periphery of the face portion 22 is joined by, for example, welding. Thereby, as shown in FIG.3 (c), the head main body 20 with which the hosel part 30 was attached is obtained. In this case, as shown in FIGS. 3C and 4A, the gap g between the neck hole portion 28a and the shaft fixing member 32 of the hosel portion 30 is not sealed (sealed).

Next, the process for sealing the gap g will be described.
First, as shown in FIG. 4A, for example, five annular resin members 44 made of a thermoplastic resin are prepared.
Next, each resin member 44 is pushed through the shaft fixing member 32 and inserted into the inside 20 a of the head body 20 through the gap g.

Next, a cylindrical elastic member 40 is prepared (see FIG. 4A). The elastic member 40 is pushed into the inner surface 40b through the shaft fixing member 32, and the elastic member 40 is inserted into the gap g from the crown portion 28 side. insert. As a result, as shown in FIG. 4B, the resin member 44 is inserted into the interior 20a of the head body 20, and the elastic member 40 is inserted into the gap g.
Here, when the elastic member 40 is inserted into the gap g, a moisture curable adhesive is applied to the surface 40 a of the elastic member 40. In order to increase the adhesive force, it is preferable to apply a moisture curable adhesive after applying a primer to the surface 40a.
Further, the elastic member 40 is not limited to a cylindrical shape, and may be a tapered shape whose surface is inclined in the axial direction.

The resin member 44 can be formed, for example, by punching a sheet made of a thermoplastic resin. Each resin member 44 has an outer diameter that is equal to or smaller than the inner diameter of the neck hole portion 28 a, and the inner diameter is equal to or larger than the outer diameter of the shaft fixing member 32. That is, the thickness of each resin member 44 is not more than the gap g.
The resin member 44 is for forming the resin layer 42, and the resin member 44 has the same composition as the resin layer 42. Therefore, also in the resin member 44, a thermoplastic resin having a melting point of 50 ° C. to 150 ° C. and a melt flow rate of 100 to 400 g / 10 min at a load of 2.16 kg at a temperature of 190 ° C. is used. Is preferred. As this thermoplastic resin, for example, Bond First (trade name) can be cited. In addition, the same resin layer 42 as that described above can be used as this thermoplastic resin.

Further, the number of the resin members 44 may be an amount sufficient to form the resin layer 42, and it is preferable to determine the number of the resin members 44 in advance by an experiment or the like.
If the resin member 44 is thick in the axial direction, it is difficult to insert the resin member 44 into the interior 20a of the head body 20 through the gap g. On the other hand, when the thickness in the axial direction is small, the number of the resin members 44 sufficient to form the resin layer 42 is increased, and it takes work time. Thus, from the viewpoint of workability, the thickness of the resin member 44 in the axial direction may be appropriately determined.

Next, the gap g is sealed from the inside of the head main body 20 to which the hosel part 30 is attached using the thermostatic device 60 shown in FIG.
Here, the thermostat 60 is provided in a thermostat 62, a heated gas supply unit 64 capable of circulating and supplying a gas such as air heated to a predetermined temperature, and the thermostat 62. A base 66 and a holder 68 that is provided on the base 66 and holds the head main body 20 are provided.

In the thermostatic device 60, the holder 68 is inserted into the opening 32 a (see FIG. 2) of the hosel part 30 to hold the head main body 20, the crown part 28 downward, and the axis C of the hosel part 30 vertically. Is something that can be done.
When the head body 20 is held, it is only necessary that the crown portion 28 can be at least downward, and it is not always necessary to make the axis C of the hosel portion 30 vertical.

When using the thermostatic device 60 to seal the gap g from the inside of the head body 20, first, the holder 68 is inserted into the opening 32 a of the hosel portion 30, and the crown portion 28 faces downward in the thermostatic bath 62. The head body 20 is arranged.
Next, for example, heated air H having a temperature of 125 ° C. is circulated and supplied from the heated gas supply unit 64 into the constant temperature bath 62 for 60 minutes. As a result, the head main body 20 is held in an environment at a temperature of 125 ° C. for 60 minutes (1 hour).
Then, the resin member 44 is melted, and the molten resin moves downward, that is, toward the crown portion 28 due to fluidity due to its own weight. The molten resin spreads over the elastic member 40, the face portion 22, and the crown portion 28.

Next, after 60 minutes have elapsed, the circulating supply of the heated air H is stopped, the head main body 20 is taken out from the thermostatic bath 62, and cooled to room temperature in the atmosphere.
Thereby, the resin layer 42 (refer FIG. 2) which consists of molten resin is formed in thickness d (refer FIG. 2) of 0.1 mm-3 mm, for example, and the clearance gap g is sealed from the inside 20a of the head main body 20. FIG. (Sealed).
The heating air H supplied from the heating gas supply unit 64 into the thermostat 62 and the supply time thereof are not particularly limited to the temperature of the heating air H being 125 ° C. and the supply time being 60 minutes. In the present embodiment, when the gap g is sealed with molten resin, the temperature of the heated air H may be in the range of 110 to 150 ° C., and the supply time may be in the range of 0.5 to 2 hours. By supplying the temperature of the heated air H and the supply time into the thermostatic chamber 62 within the above ranges, the gap g can be reliably sealed from the inside 20a of the head body 20.

  As described above, in the method of manufacturing the golf club head 12 according to the present embodiment, the elastic member 40 side the crown portion 28 side with respect to the gap g between the shaft fixing member 32 of the hosel portion 30 and the neck hole portion 28a. From the inside 20a side of the head body 20 with a molten resin (resin layer 42). Further, since the moisture curable adhesive is used for bonding the elastic member 40 sealed from the crown portion 28 side, moisture from the outside is used for bonding with the moisture curable adhesive. Thereby, the penetration | invasion of the water | moisture content to the inside 20a of the head main body 20 can be prevented.

In the present embodiment, since the gap g can be sealed from both sides from the crown portion 28 side and the inside 20a side of the head body 20, high sealing performance can be obtained, and the head body 20 can be obtained from the gap g. It is possible to prevent foreign matter such as water or dust from entering the interior 20a.
Furthermore, the obtained golf club head 12 can achieve high launch and low spin as described above. Therefore, the flying distance is improved with respect to the golf club head (golf club) in which the hosel part is fixed to the sole part and the crown part, and excellent hitting performance can be obtained with respect to the flying distance, etc. In addition, as described above, breakage of the golf club shaft can be prevented.

In addition, this invention is not limited to the structure of the golf club head 12 of this embodiment.
In the present invention, like the golf club head 12a shown in FIGS. 6 (a) and 6 (b), the blocking portion 50 that restricts the range in which the molten resin constituting the resin layer 42 spreads is provided on the back surface 28b of the crown portion 28. For example, it may be provided so as to surround the edge of the neck hole portion 28a. In this case, the blocking portion 50 is provided so as to surround the edge portion of the neck hole portion 28a (the shaft fixing member 32 of the hosel portion 30) at least 180 ° (half circumference) around the axis C of the hosel portion 30. Is.
Moreover, as shown in FIG.6 (b), the damming part 50 consists of a metal member or alloy member whose cross-sectional shape is a rectangular shape, for example. The height h of the dam member 50 is, for example, 2 to 10 mm. In the golf club head 12a, when the resin layer 42 is formed by the damming portion 50, the spread of the molten resin is restricted, and the gap g can be sealed more reliably.

  Further, in the present embodiment, the configuration of the crown portion 28 may be such that the neck hole portion 28a can be formed and has a strength that does not cause deformation when the elastic member 40 is inserted into the gap g. It is not particularly limited. The configuration of the crown portion 28 may be, for example, a configuration in which a part of the crown portion is replaced with a member having a low elastic modulus. The member having a low elastic modulus is, for example, a solution treatment material of a titanium alloy having a composition of Ti-15V-3Cr-3Al-3Sn (Young's modulus is 95 GPa), Ti-11Mo-9Sn (Young's modulus is 60 GPa), Ti-23Nb-0.7Ta-2Zr-1.2O (Young's modulus is 65 GPa), Ti-9Nb-12Ta-3V-6Zr-1.5O (Young's modulus is 55 GPa) or Ti-40Nb-3Ta-3Zr (Young's modulus) Is a titanium alloy having a composition of 50 GPa) or a fiber-reinforced composite material such as CFRP.

  Further, regarding the configuration of the golf club head, when the golf ball is hit, the hosel portion 30 and the head body 20 relatively move so that the loft angle becomes large, and the hosel portion 30 is the neck hole portion 28a of the crown portion 28. The configuration is not particularly limited as long as it protrudes upward from the top. For this reason, the hosel portion 30 is not limited to the one in which the support member 34 is erected on the inner surface 24 a of the sole portion 24. For example, the support member may be provided inside the head body and connected to the other end of a plate member having one end connected to the inner surface of the sole portion opposite to the face portion.

  As mentioned above, although the manufacturing method of the golf club head of this invention was demonstrated, this invention is not limited to the above-mentioned embodiment, In the range which does not deviate from the summary of this invention, you may perform various improvement or a change. Of course.

(A) is a typical perspective view which shows the golf club which has a golf club head obtained by the manufacturing method of the golf club head of this invention, (b) is obtained by the manufacturing method of the golf club head of this invention. 1 is a schematic side view showing a golf club having a golf club head. FIG. 2 is an enlarged partial cross-sectional view of a main part of the golf club head shown in FIG. (A)-(c) is a schematic diagram which shows the manufacturing method of the golf club head of this embodiment in order of a process. (A) And (b) is a schematic diagram which shows the manufacturing method of the golf club head of this embodiment in order of a process from the next process of FIG.3 (c). It is a schematic diagram which shows the thermostat used for the manufacturing method of the golf club head of this embodiment. (A) is a typical perspective view which shows the principal part of the modification of the golf club head obtained by the manufacturing method of the golf club head of this invention, (b) is a golf club head shown to Fig.6 (a). It is a partial cross-section enlarged view of the modified example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Golf club 12 Golf club head 14 Golf club shaft 20 Head body 20a Inside 20b, 20c Opening part 22 Face body 22a Face surface 24 Sole part 26 Side part 28 Crown part 28a Neck hole part 28b Back surface 30 Hosel part 32 Shaft fixing member 32a Opening 34 Support member 34a Fixed fulcrum 40 Elastic member 40a Surface 42 Resin layer 44 Resin member 50 Damping part 60 Constant temperature device 62 Constant temperature bath 64 Heated gas supply part 66 units 68 Jig C axis (central axis)
g Clearance L Score line R direction

Claims (6)

A hollow head body in which an outer shell structure is constituted by a face portion having a face surface for hitting a golf ball, a sole portion, a crown portion and a side portion, and a neck hole portion is formed in the crown portion, and a golf club shaft And a hosel portion including a support member integrally formed with the shaft fixing member, and the support member is fixed to the inside of the head body. And the shaft fixing member protrudes from the neck hole, there is a gap between the shaft fixing member and the neck hole, and a cylindrical elastic member is embedded in the gap A club head manufacturing method comprising:
Preparing the head body and the hosel part, and fixing the support member of the hosel part inside the head body;
Inserting an annular resin member into the head body through the shaft fixing member of the hosel part;
A step of moisture-curing adhesive inserts the elastic member of the applied cylindrically surface, the gap through the shaft fixing member of the hosel,
While holding the head body with the crown portion facing down, the head body is held at a predetermined temperature for a predetermined time, the annular resin member is melted, and the molten resin is inserted into the gap. Forming a resin layer that covers the cylindrical elastic member from the inside of the head main body .   The method of manufacturing a golf club head according to claim 1, wherein the resin member is made of a thermoplastic resin and has a melting point of 50 ° C. to 150 ° C.   3. The golf club head according to claim 1, wherein the resin member is made of a thermoplastic resin and has a melt flow rate of 100 to 400 g / 10 min at a temperature of 190 ° C. and a load of 2.16 kg. Method. The step of forming the resin layer with the molten resin is performed by holding the head main body at a temperature of 110 to 150 ° C. for 0.5 to 2 hours. Golf club head manufacturing method.   The golf club head manufacturing method according to claim 1, wherein the elastic member is made of rubber or synthetic resin having a hardness of 40 to 90 in a JIS-A type hardness meter.   The method for manufacturing a golf club head according to claim 1, wherein the moisture curable adhesive is an acrylic-modified silicone adhesive.

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