JP2000116824A - Golf club head and inner surface processing method of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a foreign matter from dropping inside of a hollow part from an inner surface of a crust for preventing the generation of noise and to easily form a coating film layer of uniform thickness, by forming the layer of powder coating material on the inner surface of the crust forming a metallic golf club head having a hollow part. SOLUTION: A crust 2 forming a metallic golf club head 1 having a hollow part 11 is manufactured by assembling a part 3 obtained by integrally molding a neck part for connecting a shaft and a face surface by casting, a part 4 obtained by integrally molding a sole surface and its peripheral part by casting, and a part 5 obtained by integrally molding a crown surface and its peripheral part by casting, by welding connection. On the inner surface 8 of this crust 2, the welding beads 10 are formed corresponding to the welding connection parts of all parts 3-5, and a coating film layer 9 made of powder coating material is formed on the whole surface including the welding beads 10. A particle size of the powder coating material is determined to be less than 50 μm, or 50-100 μm, and the coating film layer 9 of uniform thickness is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal golf club head having a hollow portion provided with a coating layer on an inner surface thereof, and to a method for treating the inner surface of the golf club head.

[0002]

2. Description of the Related Art Conventionally, in a metal golf club head having a hollow portion, an outer shell constituting the golf club head is formed by joining a plurality of parts formed by forging or casting with welding or bonding. Is generally assembled. In a golf club head manufactured in this manner, a weld metal that forms a weld bead in the case of a golf club head assembled by welding is formed from the inner surface of the outer shell by an impact when repeatedly hitting a golf ball. In the case of a golf club head assembled by bonding, an adhesive-hardened plastic is used, and in a case where the metal forming the outer shell is easily oxidized, an oxide film is used. )
Chips or chips may be missing and fall into the hollow part. The foreign matter that has fallen into the hollow portion moves in the hollow portion and hits the inner surface of the golf club head every time it swings, and generates a noise sound of “crack”, which gives the player discomfort.

[0003] Even if the golf ball is hit repeatedly, foreign matter is prevented from falling into the hollow portion from the inner surface of the outer shell constituting the golf club head, and noise noise is prevented from occurring. There has not been a golf club head and a method for treating the inner surface of the golf club head.

[0004] As a similar one, for example, Japanese Patent Laid-Open No.
In 148288, a piece getter having an adhesive surface is arranged in the hollow portion of the golf club head,
There is disclosed a golf club head that captures foreign matter that has fallen into a hollow portion by bonding the foreign matter to an adhesive surface of the piece getter.

Japanese Utility Model Application Laid-Open No. 7-27632 discloses a urethane resin coating on the inner surface of an outer shell constituting a metal golf club head having a hollow portion for the purpose of silencing a high hitting sound peculiar to metal. A golf club head comprising a paint layer comprising a vibration absorbing paint in which an extender such as titanium oxide is added to a paint selected from an epoxy resin paint, an alkyd resin paint, an acrylic resin paint, and an aqueous emulsion paint. As a method of treating the inner surface of the golf club head, a required amount of the vibration absorbing paint is poured into a hollow portion of the golf club head, and the inner surface of the head is coated with the vibration absorbing paint while rotating or vibrating the head. Thereafter, a method of applying a paint layer to the inner surface of the head by performing a heat treatment and curing the same is disclosed.

In the art, the term “paint” generally refers to an organic solvent type paint (a liquid paint obtained by diluting a resin with a volatile organic solvent). The adverse effect of a solvent on the human body and the global environment is a serious problem. In the United States, the United Kingdom, and Germany, VOC (Volatileorg-a)
nicocompound, volatile organic substances) regulations. Although there is no regulation by law in Japan, voluntary reduction of VOC is desired.

[0007]

However, the golf club head disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 7-148288 does not prevent foreign matter from falling into the hollow part, but removes the foreign matter from falling into the hollow part. A golf club head that is captured by bonding to a sticky surface of a getter, and when a golf club equipped with this golf club head is used for a long period of 10 years or more, the sticky surface of the piece getter is dried. As a result, the adhesive force is lost, and it becomes impossible to adhere and capture the foreign matter, so that there is a problem that generation of noise noise cannot be prevented.

In the golf club head disclosed in Japanese Utility Model Laid-Open No. 7-27632, a metal layer is formed by providing a paint layer made of a vibration absorbing paint on the inner surface of an outer shell constituting a metal golf club head having a hollow portion. Although a specific high hitting sound can be silenced, since the extender such as titanium oxide is added to the vibration absorbing paint, adhesion to metal is poor, and the extender is contained in the vibration absorbing paint. And the thickness of the coating layer is not uniform. Therefore, if the impact at the time of repeatedly hitting the golf ball is large, the thin or thick portion of the paint layer made of the vibration absorbing paint provided on the inner surface of the outer shell is peeled or chipped into small pieces or particles. Or fall into the hollow part and cause noise noise.

Further, in the method disclosed in Japanese Utility Model Laid-Open No. 7-27632, in which a paint layer made of a vibration absorbing paint is provided on the inner surface of an outer shell constituting a golf club head, the vibration absorbing paint is a liquid. After pouring the required amount of the vibration-absorbing paint into the hollow portion of the golf club head, there is a problem that the vibration-absorbing paint is not applied to every corner of the inner surface unless the head is rotated or vibrated.
In order to adjust the film thickness of the paint layer, for example, when a paint layer having a thickness of 30 μm or more is formed, the vibration-absorbing paint can usually be obtained only in a thickness of about 10 μm to 30 μm by one coat (one application). Therefore, the number of application must be increased, that is, the required amount of the vibration-absorbing paint is poured into the hollow portion of the golf club head, and the head is rotated or vibrated to apply the vibration-absorbing paint to every corner of the inner surface. After that, a series of operations of performing a heat treatment and curing must be repeated several times, and thus there is a problem that the operation is complicated and time-consuming. When the viscosity of the vibration-absorbing paint is increased, 30 μm
Since the above film thickness is obtained, the number of repetitions of the above-described series of operations is reduced, but the fluidity of the vibration-absorbing paint is deteriorated. Is not applied to
Or, even if applied to every corner, because the thickness of the paint layer is not uniform, the thin portion or the thick portion is peeled or chipped into small pieces or particles and falls into the hollow portion, There has been a problem that noise noise is caused.

In addition, since the organic solvent type paint such as urethane resin paint, epoxy resin paint, alkyd resin paint and acrylic resin paint is used as the paint constituting the vibration absorbing paint, the volatile organic solvent in the paint is used. For a long period of time, causing intoxication, or causing the volatile organic solvent to evaporate into the air and cause global warming.

In view of the drawbacks of the conventional golf club head and the method for treating the inner surface of a golf club head, even if the golf ball is repeatedly hit, foreign matter falls into the hollow portion from the inner surface of the outer shell constituting the golf club head. To prevent noise noise from occurring,
An object of the present invention is to provide a golf club head and a method for treating the inner surface of a golf club head that are easy to perform, can form a coating layer having a uniform thickness on every corner of the inner surface, and are friendly to the human body and the global environment.

[0012]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above object.
A golf club head characterized in that a coating layer made of a powder coating is provided on an inner surface of an outer shell constituting a metal golf club head having a hollow portion.

According to a second aspect of the present invention, the powder coating is electrostatically spray-coated on the inner surface of an outer shell constituting a metal golf club head having a hollow portion, and then subjected to a baking treatment. A method for treating the inner surface of a golf club head, comprising forming a coating layer comprising:

According to a third aspect of the present invention, there is provided a method for treating the inner surface of a golf club head, wherein the powder coating has a particle diameter of less than 50 μm.

According to a fourth aspect of the present invention, there is provided a method for treating the inner surface of a golf club head, wherein the powder coating has a particle size of 50 μm to 100 μm.

[0016]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a perspective view showing a golf club head 1 according to an embodiment of the present invention. FIG. 2 is a perspective view showing a state before the golf club head 1 is assembled.
FIG. 2 is a sectional view taken along line AA of FIG. 1. The golf club head 1 shown in FIG. 1 is a metal golf club head having a hollow portion, and an outer shell 2 constituting the golf club head 1 has, as shown in FIG. 6, a part 3 in which the face surface 7 is integrally formed by forging, a part 4 in which the sole surface and its peripheral portion are integrally formed by forging, and a part in which the crown surface and its peripheral portion are integrally formed by forging. The three parts 5 are assembled by welding. As shown in FIG. 3, on the inner surface 8 of the outer shell 2, a welding bead 10 is formed at a welding joint portion of the three parts 3, 4, 5, and further includes the welding bead 10. A coating layer 9 made of a powder coating is provided on the entire inner surface 8.

The powder coating has excellent impact resistance,
Acrylic resin powder coating, polyester resin powder coating, epoxy resin powder coating, epoxy / polyester resin powder coating, acrylic / polyester resin powder coating, fluorine-based powder with good adhesion to metals and plastics A powder coating or the like can be used, but an acrylic resin powder coating or a polyester resin powder coating is preferable because it has excellent long-term durability and does not deteriorate.

In the golf club head 1 of the present invention, the surface of the welding bead 10 is uniformly covered with a coating layer 9 made of a powder coating material having excellent impact resistance and good adhesion to metals and plastics. Therefore, even if the golf ball is repeatedly hit, the weld metal forming the weld bead 10 does not fall into the hollow portion 11 due to chipping of small pieces or particles, thereby preventing generation of noise noise. Can be.

The outer shell of the metal golf club head having the hollow portion 11 is composed of three parts, part 4, part 5, and part 5, which are necessarily formed by forging as shown in FIG. It is not limited to welding and joining parts, and although not shown, the neck part, face face, crown face and peripheral part connecting the shaft are integrally molded by casting, and the sole face part is forged. Alternatively, two parts formed by casting may be bonded together or by using both bonding and screwing. In this case, by providing a coating layer made of a powder coating on the inner surface of the outer shell, it is possible to prevent the adhesive-cured plastic from falling into the hollow portion in the form of small pieces or particles.

When the parts forming the outer shell are made of easily oxidizable metal such as titanium alloy or aluminum alloy, an oxide film may be formed on the metal surface. By providing a coating layer made of a powder coating on the inner surface, it is possible to prevent the oxide film from falling into the hollow part lacking small pieces or particles.

Next, an inner surface treatment method for forming a coating layer 9 made of powder paint on the inner surface 8 of the outer shell 2 constituting the metal golf club head 1 having the hollow portion 11 will be described. As shown in FIG. 4, the nozzle tip 14 of the electrostatic powder spray coating gun 13 is inserted into the hole communicating with the hollow portion 11 from the opening 12 provided on the end face of the neck portion 6 of the golf club head 1. After being inserted so as to reach the part 11, the electrostatic powder spray coating gun 13 is operated to feed the powder coating material 17 with the air for conveyance, and at the same time, the high voltage power supply 1 is used.
High voltage of 6 to -60 kV to -80 kV is applied to corona pin 1
5 to generate a corona discharge and give an electric charge to the powder coating material 17, the particles of the powder coating material 17 fly in the hollow portion 11 on the air flow because the mass is very light. The golf club head 1 is uniformly scattered and electrostatically adheres to the inner surface 8 of the outer shell 2 constituting the golf club head 1 grounded in advance by electrostatic attraction. (Explanation of electrostatic spray coating) Thereafter, the golf club head 1 is heated at a temperature of 130 ° C. to 180 ° C. for 20 minutes to 40 minutes to cure the powder coating 17, thereby obtaining the powder coating 17. Is formed. (... Description of printing process)

In order to adjust the thickness of the coating layer 9,
It is only necessary to adjust the amount of the powder paint 17 ejected per hour and the operating time of the electrostatic powder spray coating gun 13.
A coating layer 9 having a uniform thickness in the range of 0 μm to 500 μm,
It can be formed with one coat. When the coating layer 9 having a thickness greater than 500 μm is formed, the number of coats may be increased.

The mass of the coating layer 9 can be adjusted by adjusting the particle diameter of the powder coating 17. For example, if the particle size of the powder coating 17 is less than 50 μm, preferably 25 μm to 45 μm,
Since the coating layer 9 having a uniform thickness of 1 g to 2 g can be formed, it is possible to prevent foreign matter from falling into the hollow portion from the inner surface of the outer shell 2 without increasing the total mass of the golf club head 1. Noise generation can be prevented.
If the particle size of the powder coating 17 is 50 μm to 100 μm, preferably 60 μm to 80 μm, the coating layer 9 having a uniform film thickness of 3 g to 4 g can be formed. It is possible to increase the mass and to prevent foreign matter from falling into the hollow portion from the inner surface of the outer shell, thereby preventing generation of noise noise.

Therefore, according to the method for treating the inner surface of the golf club head 1, the powder is applied to every corner of the inner surface 8 of the outer shell 2 constituting the golf club head 1 without rotating or vibrating the golf club head 1. By applying the paint 17, the coating layer 9 having a uniform thickness can be formed. In addition, the adjustment of the film thickness of the coating film layer 9 is also performed from 20 μm to 500 μm.
It can be easily performed with one coat over a wide range of m. Further, by adjusting the particle diameter of the powder coating 17, the mass of the coating layer 9 can be adjusted.

[0025]

As described above, in the golf club head according to the present invention, a coating layer made of powder paint is provided on the inner surface of the outer shell constituting the metal golf club head having a hollow portion. Since the golf club head is characterized in that, even if the golf ball is repeatedly hit, it is possible to prevent foreign substances from falling into the hollow portion from the inner surface, thereby preventing generation of noise noise.

Further, in the method for treating the inner surface of a golf club head according to the present invention, the inner surface of an outer shell constituting a metal golf club head having a hollow portion is subjected to electrostatic spray coating with a powder coating, followed by baking treatment. Is applied to the inner surface treatment method of a golf club head, characterized in that a coating layer made of the powder coating is formed by applying the powder coating to every corner of the inner surface. A thick coating layer can be formed. Further, the thickness of the coating layer can be easily adjusted with one coat in a wide range of 20 μm to 500 μm.

The powder coating is an acrylic resin powder coating or a polyester resin powder coating to form a coating layer having excellent impact resistance, adhesion to metal, and long-term durability. be able to.

Further, by setting the particle diameter of the powder coating material to less than 50 μm, a coating layer having a uniform thickness of 1 g to 2 g can be obtained, and the outer diameter can be increased without increasing the total mass of the golf club head. It is possible to prevent foreign matter from falling into the hollow portion from the inner surface of the shell, thereby preventing generation of noise noise.

Further, the particle size of the powder coating is 50 μm to 50 μm.
By setting the thickness to 100 μm, a coating layer having a uniform thickness of 3 g to 4 g can be obtained, increasing the total mass of the golf club head and preventing foreign substances from falling into the hollow portion from the inner surface of the outer shell. This can prevent noise noise from being generated.

Since the golf club head and the method for treating the inner surface of the golf club head according to the present invention use a powder coating containing no volatile organic solvent, they are pollution-free and have no adverse effect on the human body or the global environment. Has no effect.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a golf club head according to an embodiment.

FIG. 2 is a perspective view showing a state before assembling the golf club head of the embodiment.

FIG. 3 is a sectional view taken along line AA of FIG. 1;

FIG. 4 is an explanatory view showing a method of processing the inner surface of the golf club head according to the embodiment.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 golf club head 2 outer shell 3 parts 4 parts 5 parts 6 neck 7 face 8 inner surface 9 coating layer 10 weld bead 11 hollow 12 opening hole 13 electrostatic powder spray coating gun 14 nozzle tip 15 corona pin 16 height Voltage power supply 17 Powder paint

Claims (4)

[Claims] 1. A golf club head comprising a metal golf club head having a hollow portion and a coating layer made of a powder coating provided on an inner surface of an outer shell. 2. A coating layer made of the powder paint by subjecting the inner surface of an outer shell constituting a metal golf club head having a hollow portion to electrostatic spray coating and then baking the powder paint. Forming an inner surface of the golf club head. 3. The method according to claim 2, wherein the powder coating has a particle diameter of less than 50 μm. 4. The powder coating material has a particle diameter of 50 μm to 1 μm.
4. The method for treating the inner surface of a golf club head according to claim 2, wherein the thickness is 00 μm.