JP2000042150A - Golf club head and manufacture therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the strength, prevent deformation of a neck hoesel part due to repeated hitting, and eliminate deviation of various angles such as a lie angle or the like by specifying the volume of a head and the length of a shaft in a hollow golf club head formed by joining four-split base materials integrally. SOLUTION: Four-split base materials of a body main body part 5 having a crown part 1, a neck hoesel part 2, a face part 3 and a sole 4 are joined integrally, and the volume of a hollow head is set to 350 cc-500 cc to constitute a super large club head. A light-weighted shaft inserted in a club head is set 48 inch or more long, and carbon or the others are suitably selected as raw material of long and super light-weighted shaft to be used. The outline of the club head is such that the face back side is formed sharp to reduce air resistance, the sectional form in the direction of hitting a ball is formed like a thin shallow back, and a recessed part 4a gradually increased in width is formed in the sole part 4 to decrease air resistance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention makes it possible to simultaneously and integrally form a golf club head, in particular, a plurality of divided head constituent base materials by forging, so that the head volume can be set as large as possible. By developing a shaft that optimally matches this ultra-large-volume club head, a golf club head that can achieve the maximum flight distance as a driver at the present time and succeeded in developing the lightest product and a method of manufacturing the same It is about.

[0002]

2. Description of the Related Art In recent years, there has been competition for the development of a super large head in order to increase the flight distance of a driver. As a functional feature of the ultra-large head, for example, according to an off-center hit experiment, it has been shown in an experiment result that when the club head becomes large, the ratio of mistakes even if some spots are removed becomes low. That is, as an example, when a driver of 300 cc class or more is displaced about 5 mm up and down from the sweet spot, the down speed of the ball initial speed is smaller than that of a 200 cc class stainless head. It has been proved that the energy loss at the time of off-center hit is reduced accordingly. This means that removing the core does not significantly affect the flight distance of the ball. Therefore, if the driver is 300cc or higher, there is no problem if he swings without worrying about some mistakes. The above example is an experimental result of an off-center hit in the vertical direction. However, since the head of a driver of 300 cc or higher class should be particularly strong against a mis-hit in the toe-heel direction, the difference from the stainless head with 200 cc is considered. Also, the height of the launch angle and the small amount of spin become remarkable.

[0003] Further, as a technical problem of the shape and manufacturing method of the large head, such a large head is required to have strength and durability to withstand an impact at the time of impact, and also to have a high coefficient of restitution at the time of impact. Is done. As the material, ceramics, stainless steel, titanium, titanium alloy, aluminum alloy, and other materials are used, and the head body itself is manufactured by forging or lost wax casting. As a surface treatment of these head bodies, a case in which the surface is polished with a metal material and used as is, a nickel chrome plating or a baking coating is generally performed. Furthermore, for the purpose of increasing the frictional resistance with the golf ball at the time of hitting the ball, increasing the spin rate of the golf ball, and increasing the flight distance, the ceramic powder and the metal powder are simultaneously sprayed on the surface of the head body so as to be 50 to 50%. 200
A head provided with a thermal spray coating having a thickness of μm is also provided and known.

Recently, metal heads made of titanium or a titanium alloy having a low specific gravity have been developed and distributed on the market. In these head bodies, titanium alloys have been used in order to improve wear resistance. Titanium nitride (T
iN) is formed by forming a titanium nitride (TiN) film layer by an ion plating method, which is a kind of PVD coating method, and then coating an alkali silicate on the film layer to form a kind of glass film layer. Such a head is also known.

Similarly, a nickel chrome plating layer is formed on a steel head body to further improve wear resistance, and titanium nitride (T) is formed on the nickel chrome plating layer.
iN) is converted to titanium nitride (T) by ion plating.
A head having an iN) coating layer is also known.

Further, as a method of manufacturing a lightweight metal wood head, a sole member is separately molded by a loss and wax method on a head body in which a clamp portion of the head is integrally formed, and then fitted to the head body by welding. Integrated metal wood, or, as another, titanium or titanium alloy material by forging such as pressing, face member,
A crown member having a divided hosel part and a shaft insertion part are separately formed, and these constituent members are joined together. At this time, an L-shaped reinforcing rib for reinforcing the sole member and the face member is used, and , Titanium or a back weight larger in specific gravity than titanium alloy is fixed to the inside of the rear part, forming a metal wood head body integrated by welding,
It is well known that a shaft tip is attached to the shaft insertion portion and integrated (for example, Japanese Patent Application Laid-Open No.
No. 6).

[0007] According to these metal wood heads, in particular, the loss and wax manufacturing method, a metal wood head body in which a crown portion and a hosel portion of the head are integrally formed,
The sole member is separately molded by the lost wax method,
The one that is joined by welding to the metal wood head body and integrated by welding is a cast product, so it is easy for segregation of molten metal components, pinholes and other defects at the time of casting to occur, and for the deposited metal material Since the crystallinity is large and the mechanical strength of the metal wood head itself is low, the durability of the metal wood head itself needs to be improved, so the thickness of the outer shell itself of the metal wood head must be set thick As a result, the weight of the head itself is increased, the volume ratio of the metal wood head is reduced, and the sweet spot cannot be increased.

In order to solve these technical problems, as described above, titanium or titanium alloy material is formed into a thin body by forging such as pressing, and the volume ratio of the metal wood head is reduced. Can be increased. Furthermore, by mounting a back weight made of lead having a higher specific gravity than the titanium or titanium alloy constituting the metal wood head inside the rear part, the center of gravity of the head can be set low, and it can be set at the rear part, and the center of gravity depth is also large. It is disclosed that the sweet area can be enlarged in proportion to this, the weight can be reduced by using a titanium alloy for the head main body, the moment of inertia at the time of swing can be reduced, and the speed can be increased even with a small force.

According to the above-mentioned disclosed technology, the combination structure of the golf club head and the back weight made of titanium or a titanium alloy certainly uses a lead back weight made of lead as a material having a higher specific gravity than titanium or a titanium alloy. Since the back weight is fixed to the inside of the rear portion, the volume ratio of the back weight itself increases, and the back weight swings right and left relative to the center of the head main body, so that the sweet area can be expanded. However, the expansion of the sweet area means that even if a relatively low-tech person can hit in the sweet area, the ball will fly straight, but the setting of each hole on the course is only to fly straight straight It is not a simple course design that says that it will be completed, and in the case of setting the hole of the left and right dog legs, it is necessary for some advanced users to select and select the ball muscle.

[0010] Therefore, to a certain degree of advanced users, a golf wood club head made of titanium or a titanium alloy or other lightweight metal with a back weight attached to the head has a wider sweet area and a more spherical ball. The development and provision of golf club heads that can control the temperature have been demanded.

Further, in these conventional golf club heads, as a method of fixing the back weight, a method of directly welding or bonding the inside of the rear portion of the head body is adopted. In the case of welding, iron or brass is used. Although the back weight made of aluminum can be fixed relatively firmly, the residue generated during welding has the disadvantage that the welding debris peels off due to repeated hitting and causes abnormal noise in the head body. On the other hand, in the bonding method, there is a possibility that peeling or cracking may occur on the bonding surface due to repeated hitting, and a back weight may be removed. In addition, in the case of lead weights made of lead, the compatibility of the two metals is poor even when they are welded to the head body made of titanium alloy. There was a defect that peeled off from.

[0012]

According to the present invention, as a result of an off-center hit experiment of the large head, a method of manufacturing the large head, an increase in the head volume, and a reduction in the air resistance, the head volume is reduced. Maximize,
Make the club shaft long (48 inches or more)
It is another object of the present invention to provide a driver for an ultra-large head having a head shape with a minimum air resistance reducing structure.

Results of the off-center hit experiment 300
The driver's head of cc class or higher should be able to cope with toe and heel mis-hits.
It has been proven that the difference between C and the stainless steel head is significant.

In addition, in the present invention, the inventors have confirmed that the launch angle and the spin rate are small in the experimental case of the present invention. Further, it is said that the large head generally has a tendency to increase the spin amount, but the result of the experiment according to the present invention has confirmed that the large head has an amount equivalent to that of stainless steel. This effect was realized by the weight distribution and the functionality of the head itself. At the same time, the driver realized that the lower the center of gravity, the longer the distance. That is, according to the present invention, if the center of gravity is low, a hit can be made above the center of gravity. When hitting above the center of gravity, the effect of suppressing the backspin is exerted by the gear effect in the vertical direction of the face, so it was confirmed that the launch angle is high and the trajectory has a parabolic flight distance.

[0015]

SUMMARY OF THE INVENTION The present invention is a golf club head invented to achieve the above object,
A hollow golf club head integrally joined with a four-piece base material of a body main body having a crown portion, a neck hosel portion, a face portion and a sole, and having a head volume of 35
A golf club head characterized by being formed with a shaft length of 0 to 500 cc and a shaft length of 48 inches or more.

The heat treatment for the forging of the hollow club head integrally joined with the four-piece base material is performed by a four-piece base material of a body main body having a crown portion, a neck hosel portion, a face portion and a sole. Wherein the thickness of the crown portion is a beta or 6-4 titanium plate with a thickness of 0.8-1,2 mm, and the thickness of the face portion is 1,8-2. , 5mm beta titanium plate, body part thickness with sole part is 0.8 ~
It is carried out by heating a 1 or 2 mm beta or 6-4 titanium plate.

Further, the heat treatment temperature for the forging process of the hollow club head integrally joined with the four-piece base material is determined by dividing the body part having the crown, neck hosel, face and sole into four parts. A hollow golf club head integrally joined with a base material, wherein the crown portion has a thickness of 0.8 to 1,2 mm in a beta or 6-4 titanium plate, and the face portion has a thickness of 1,8. The thickness of the body of the main body including the beta titanium plate of ~ 2,5 mm and the sole portion is 0.8 to 1,2 mm, and the heating temperature of the component plate of the crown portion in the heat treatment of the beta or 6-4 titanium plate. Is about 550 ° C to 850 ° C, the heating temperature of the component plate of the face part is about 850 ° C, and the heating temperature of the component plate of the body body part having the sole part is about 650 ° C to 800 ° C. Implemented.

Further, in order to increase the flight distance when using the hollow club head integrally joined by the four-divided base material and to minimize the air resistance, the crown portion, the neck hosel portion, the face portion and The outer shape of the body body with the sole part is formed sharply on the face back side to reduce air resistance, the cross-sectional shape in the hitting direction is a thin shallow face shape, and the sole part is flat. The golf club head is provided with a concave portion that is gradually widened from the face side to the back face side.

The material constituting the hollow club head integrally joined by the four-piece base material is formed by arbitrarily selecting from titanium or a titanium alloy, an aluminum alloy, a duralumin alloy, and a magnesium alloy. It is characterized by.

The method for manufacturing an ultra-large golf wood club having a head volume of 350 cc to 500 cc by forging is performed by integrally joining a four-part base material of a body main body having a crown portion, a neck hosel portion, a face portion and a sole portion. A hollow golf club head, wherein the one-piece joining of the four-piece base metal is performed by welding in a container chamber in a vacuum state, and after welding is completed, while adjusting the head weight so as not to deform the club head. A method of manufacturing a golf club head, which comprises polishing to a predetermined total weight, inspecting the product, and performing surface treatment such as painting.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the accompanying drawings, which show an example of operation and effects.

In any of the first to sixth aspects, the club head and the method of manufacturing the same according to the embodiment of the present invention are, as shown in FIG. 1, provided with a crown portion 1, a neck hosel portion 2, a face portion 3, and The body part 5 having the sole 4 is integrally joined with the four divided base materials, and the hollow head volume is 3
An ultra-large club head W of 50 cc to 500 cc. The newly developed lightweight shaft to be inserted into the club head W is appropriately selected from carbon, which is a long and ultralight shaft material having a length of 48 inches or more, lightweight original boron reinforced graphite, and other lightweight materials. (Not shown). However, the manufacture of this long shaft is set so as to maximize the shaft performance corresponding to the kick point and torque in consideration of the user's strength and swing rhythm.

A manufacturing process and a manufacturing method for each of the four divided base materials will be described. First, a wooden mold 6 is manufactured, and a target head volume, 5
Set to 00cc + 10% and complete the production of the shape considering air resistance and the like. The copper mold master 7 is manufactured by (1/1) of the wooden mold 6, and a forging die is manufactured. Next, a forging die for the crown 1 is manufactured, and a beta or 6-4 titanium plate 9 having a thickness of 0, 8 to 1,2 mm is forged and the crown 1 is completed.

Next, a forging die 10 was manufactured for the face portion 3 in the same manner as the crown portion 1 and the forging pressure of the beta titanium plate 11 having a thickness of 1,8 to 2,5 mm was made possible to a maximum thickness. The body main body 5 having the sole 4 is also formed with a forged mold 12 integrally provided with a bottom sole 4 having a concave portion 4a formed on the bottom surface from the face portion 3 side to the back face side to be gradually widened. Then, a beta or 6-4 titanium plate 12 having a thickness of 0.8 to 1,2 mm is forged. Further, the neck hosel portion 2 is formed by welding a member obtained by processing a forged 6-4 titanium round bar base material into a hole diameter of an insertion shaft. The forging heat temperature of the four-piece base material is set such that the heating temperature of the component plate of the crown portion 1 is approximately 550 ° C.
The heating process is performed at approximately 850 ° C., the heating temperature of the component plate of the face portion 3 is approximately 850 ° C., and the heating temperature of the component plate of the body main body portion 5 including the sole 4 is approximately 650 ° C. to 800 ° C. I do.

The outer shape of the club head according to the present invention, which comprises the four-part base material of the body main body 5 having the crown portion 1, the neck hosel portion 2, the face portion 3, and the sole 4, has a face back side. Is formed sharply to reduce air resistance, and furthermore, the cross-sectional shape in the hitting direction is formed into a thin shallow back shape, and the sole 4 has a flat surface (the sole 4 is viewed from the surface). A concave portion 4a is formed from the face portion 3 side to the back face side so as to be gradually widened so that air resistance can be extremely reduced, and a shot can be smoothly grounded when shot. In addition, due to the external shape, the thickness of the four-divided base material, the distribution of weight in each base material, the face portion 3 which can be set as thin as possible, etc., the repulsion at the time of impact jumps. Optimum spin rate and maximum flight distance can be obtained by increasing the initial speed of the ball.

The crown part 1, the neck hosel part 2,
In the embodiment of the present invention, the constituent material of the four-divided base material of the body main body portion 5 having the face portion 3 and the sole 4 is formed by forging a beta or 6-4 titanium alloy forging plate and performing vacuum welding. Although the example of manufacture is shown, the use of titanium or a titanium alloy is relatively lighter at the intermediate value between iron and aluminum compared to stainless steel, which was conventionally used as a club head, and its melting point, It is excellent in corrosion resistance, workability, specific strength, etc., and is especially suitable for hot forging and vacuum welding. Further, in the present invention, the aluminum alloy or duralumin alloy, which is a typical alloy of aluminum alloy, is selected as the material of the other examples because it is excellent in workability and can be adapted to any manufacturing method of casting and forging. High strength, excellent wear resistance, corrosion resistance, fatigue resistance, heat resistance, and low specific gravity. Examples of the present invention include:
Good weldability and forgeability, ideal for golf club heads
An aluminum alloy material having the same strength characteristics as 7075 alloy was selected. As a result, the club head could be formed by welding and welding each of the forged four-divided base materials with excellent strength, weldability and castability. Furthermore, selecting a magnesium alloy as the material of the four-divided base material is the lightest as a practical metal material, has an excellent specific gravity ratio of 2/3 of aluminum, and has excellent machinability and workability. It can reduce the processing cost, is suitable for casting and forging, has excellent mechanical properties, and is suitable as a structural material for a club head.

Further, in the manufacturing method according to the sixth aspect,
The above-described four-piece base material of the body body part 5 having the crown part 1, the neck hosel part 2, the face part 3, and the sole part 4 is integrally joined to form a hollow club head into a forging pressure of each of the four-piece base materials. , Heat processing and other processes necessary for the forging process, and further, these four-piece base materials to be integrated are welded in the container chamber 13 in a vacuum state, and after welding is completed, the club head is not deformed. Then, polishing is performed to a predetermined total weight while adjusting the head weight. At this stage, a score line is engraved on the face portion 3 according to the work process. Then, inspection is performed to determine whether there is any abnormality in the polishing, and after the painting is completed, the color of the sole characters is appropriately colored and packed on the surface of the sole 4 and the like.

It should be noted that the present invention is not limited to the above embodiment, and various modifications can be made. For example, in the embodiment, forging processing of a forging plate of a four-divided base material, forging method,
The welding method, in which hot electrons are made to collide at high speed with a high voltage from a hot cathode in a vacuum vessel to a welded joint and the energy is used as a heat source for melting the metal, can be replaced with a pressing method or a casting method using a loss and wax method. It is feasible.

[0029]

According to the present invention, the face portion 3 of the club head and the face back portion are formed sharply.
In addition, since the crown portion 1 extending from the upper portion of the face portion 3 toward the rear of the head is integrally formed by forging of vacuum welding using a forging plate, it is also stronger in strength than conventionally known ones. Since the neck hosel portion 2 is not deformed even when repeatedly hit, the lie angle, face angle and loft angle do not change. In addition, since each of the above components is integrally forged by vacuum welding, the dimensional accuracy is high, the number of molds can be reduced, so that manufacturing costs can be reduced, and welding distortion and welding residual stress can be extremely reduced. At the same time, the hardness and strength of the components are not changed, and there is no generation of pinholes in the welded portion. In the above description, the respective members are forged by way of example. However, the present invention can be implemented by other processing methods, for example, pressing.

Further, the neck hosel portion 2 of the present invention is formed by processing a round bar titanium base material into a shaft hole diameter, so that it not only has a forged structure as it is, but also a flow of a metal fiber structure, that is, a forged wire is generated. The toughness with respect to the tensile stress in the direction of this line is increased, the neck hosel portion 2 having high toughness can be manufactured, and the hit ball durability can be further increased.

The outer shape of the club head according to the present invention, which is composed of the four-part base material of the body main body 5 having the crown portion 1, the neck hosel portion 2, the face portion 3, and the sole 4, has a face back. The side is formed sharply to reduce air resistance, and the cross-sectional shape in the ball hitting direction is formed into a thin shallow back shape.
The part is provided with a concave part 4a which is gradually widened by connecting it from the face part 3 side to the back face side in the plane (when the sole 4 part is viewed from the surface), the air resistance can be extremely reduced, and the shot is smooth when shot. It can swing out by proper grounding. In addition, due to the external shape, the thickness of the four-divided base material, the distribution of weight in each base material, the face portion 3 which can be set as thin as possible, etc., the repulsion at the time of impact jumps. Optimum spin rate and maximum flight distance can be obtained by increasing the initial speed of the ball.

Further, as shown in the above embodiment, the club head according to the present invention combines the four-piece base materials which are the constituent members by setting the rigidity, elastic modulus and thickness of each material, and integrally uniting them. By doing so, the club head can be manufactured, the mechanical impedance of the club head is harmonized, the uncomfortable feeling of the hitting sound is prevented, and the resilience can be improved.

As is clear from the above description, the present invention
In the conventional 300cc class, the head volume, which was considered to be the limit in the conventional 300cc class, can be increased, the head weight can be reduced, a long shaft of 48 inches or more can be installed, the moment of inertia is increased,
It is possible to increase the meet rate by expanding the sweet area, etc., and because it is a long shaft, it is possible to address without feeling the length because it is a super large head, swinging without feeling uncomfortable with a sense of security Significant flight distance increase and spin amount Golf that can be equipped with a long shaft on an ultra-large head by synergistic effects such as optimal trajectory by reduction, increase of head speed and weight distribution by unique heel and faceback shape effects, large center of gravity angle, and deeply set center of gravity depth You can get a driver.

[Brief description of the drawings]

FIG. 1 is an exploded explanatory view showing a four-piece base material according to the present invention.

FIGS. 2A and 2B are explanatory views showing steps of a method for manufacturing a golf head according to the present invention, wherein FIG. 2A is a perspective view showing a wooden mold and a copper master, and FIG. , Side view of the crown part mold and a perspective view of the forged crown part, (c) is a side sectional view of the titanium forged plate and the face part mold and a perspective view of the forged crown part showing a manufacturing process of the face part, and (d). Is the body 5 with sole
FIG. 4 is a side cross-sectional view of a titanium forging plate and a sole part mold and a longitudinal cross-sectional view of a forged sole part showing a manufacturing process of FIG.

FIG. 3 is an explanatory view of a vacuum welding method in a manufacturing process according to the present invention.

FIG. 4 is a perspective view of a club head according to the present invention.

FIG. 5 is a central longitudinal sectional view of FIG. 4 in the club head of the present invention.

[Explanation of symbols]

 W Super large club head 1 Crown part 2 Neck hosel part 3 Face part 4 Sole 5 Body main part 6 Wood mold 7 Copper mold master 8 Crown forging die 9 Crown forging titanium plate 10 Face forging die 11 Forged titanium plate for face part 12 Forged titanium plate for concave part of sole 13 Forging die for sole part 14 Forged titanium plate for sole part 15 Container chamber in vacuum state

Claims (6)

[Claims] 1. A hollow golf club head integrally joined by a four-piece base material of a body main body having a crown portion, a neck hosel portion, a face portion, and a sole, the head volume being 350 cc to 500 cc, and a shaft being provided. Length 4
A golf club head formed to be 8 inches or more. 2. A hollow golf club head integrally joined by a four-piece base material of a body main body including a crown portion, a neck hosel portion, a face portion, and a sole, wherein the crown portion has a thickness of zero. Beta or 6-4 titanium plate of 8-1,2 mm, thickness of face part 1,8-2,5
2. A golf club head according to claim 1, wherein a beta or 6-4 titanium plate having a thickness of 0.8 to 1,2 mm is heat treated and forged. . 3. A hollow golf club head integrally joined by a four-divided base material of a body main body portion having a crown portion, a neck hosel portion, a face portion, and a sole, wherein the thickness of the crown portion is Beta or 6-4 titanium plate of 0.8-1,2 mm, thickness of face part 1,8 ~
2,5mm beta titanium plate, body body with sole part, 0.8 ~ 1,2mm beta or 6mm
-4 In the heat treatment of the titanium plate, the heating temperature of the component plate of the crown portion is approximately 550 ° C. to 850 ° C., the heating temperature of the component plate of the face portion is approximately 850 ° C., and the temperature of the body body portion including the sole portion is The heating temperature of the component plate is approximately 650 ° C. to 80
The golf club head according to claim 1, wherein the golf club head is heat-treated at 0 ° C. 4. The outer shape of the body body portion including the crown portion, neck hosel portion, face portion, and sole portion has a face back side formed sharply to reduce air resistance, and a cross-sectional shape in a hitting direction is as follows. 2. The golf club head according to claim 1, wherein the golf club head has a thin shallow back shape, and a sole portion is provided with a concave portion which is gradually widened from a face side to a back face side in a plane to gradually reduce air resistance. . 5. A hollow golf club head integrally joined by a four-divided base material of a body main body having a crown portion, a neck hosel portion, a face portion, and a sole, the constituent material of the four-divided base material. 2. The golf club head according to claim 1, wherein said golf club head is arbitrarily selected from titanium or a titanium alloy, an aluminum alloy, a duralumin alloy, and a magnesium alloy. 6. A hollow golf club head integrally joined by a four-divided base material of a body main body having a crown portion, a neck hosel portion, a face portion, and a sole portion,
The integral joining of the four-piece base material is welded in a vacuum chamber, and after the welding is completed, the club head is polished to a predetermined total weight while adjusting the head weight so as not to deform the club head,
A method for manufacturing a golf club head, which comprises performing a surface treatment such as painting after inspection.