JP3258941B2 - Golf club and its manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a golf club provided with a club head having a metallic glass face and a method of manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, in order to produce a metallic glass (amorphous alloy material), a metallic material is melted, rapidly solidified from a liquid state to obtain a quenched metal (alloy) powder, and the obtained quenched metal powder is crystallized. Various methods have been proposed, such as a method of solidifying into a predetermined shape at a temperature equal to or lower than the formation temperature to obtain a true density, a method of rapidly solidifying a molten metal or alloy to directly obtain a metal glass of a predetermined shape.

[0003]

However, most of the metallic glasses obtained by these conventional methods have a small mass, and it is difficult to obtain a bulk material that can be used for the face of a golf club head. there were. Therefore, a method of obtaining a bulk metallic glass by solidifying the quenched powder has been attempted, but a bulk material having sufficient properties such as high strength and high toughness required for the face of a golf club could not be obtained.

Further, as shown in FIG. 15A, a press die composed of an upper die a and a lower die b having fitting parts to be fitted to each other, ie, an upper die a and a lower die b. Is a method in which a molten metal c is pressed and quenched in a press mold 有 す る having vertical surfaces g and g with respect to the parting line, respectively, to produce a metallic glass face having a predetermined shape. The inventor of the present invention has repeatedly performed a great deal of trial and error on the method of melting the placed metal material using a high-energy heat source and pressing the obtained molten metal c into a predetermined shape. However, when the molten metal c is pressed by the upper die a and the lower die b, as shown in FIGS. 15 (b) and 16, the vertical surface g of the upper die a and the vertical surface g of the lower die b (fitting). Excess molten metal c flows into the small gap d) of the joining portion, whereby the molten metal c entering the gap d is rapidly cooled and solidified into a burr portion f, and this burr portion f has various shapes. It was a cause of adverse effects. In other words, the vertical surfaces g, g of the upper mold a and the lower mold b are damaged by the burr part f ("galling" occurs), and the molten metal c is thereby formed in the fitting part (gap part d). It was found that since the mold would not be closed when flowing, a product (metallic glass face e) having a predetermined shape and a predetermined thickness h could not be obtained. Further, it has been found that when the mold closing is poor, the mold itself wears out and the life is shortened.

Accordingly, the present invention has been made to solve the above-mentioned problems, and to provide a golf club having a metal glass face having a predetermined shape and excellent strength characteristics, and a method for easily manufacturing the golf club. With the goal.

[0006]

In order to achieve the above-mentioned object, a golf club according to the present invention is a golf club having a metal glass face on a club head, wherein the metal glass face is smooth. A metal material is placed on the lower die of the press die consisting of an upper die having a concave curved surface and a lower die having a cavity, and the metal material is melted using a high-energy heat source capable of melting the metal material, The obtained molten metal having a melting point or higher is pressed by the upper mold and the lower mold to deform into a predetermined shape, and after the deformation or simultaneously with the deformation, the molten metal is cooled at a critical cooling rate or higher, and the predetermined metal is produced. Shape , and the surface formed by the concave
It is a metallic glass face used as the face surface . Also,
The upper die and the lower die do not have a fitting part that fits each other.

Further, according to the method of manufacturing a golf club according to the present invention, a metal material is placed in the lower die of a press die composed of an upper die having a smooth concave curved surface and a lower die having a cavity. The metal material is melted using a high energy heat source capable of melting the molten metal, and the molten metal having the obtained melting point or more is pressed by the upper mold and the lower mold to be deformed into a predetermined shape. Cooling the molten metal at or above the critical cooling rate to a predetermined shape for a golf club head ,
A metal glass face is manufactured by using the face formed by the concave curved surface of the above-mentioned mold as a face face . In addition, the upper mold and the lower mold do not have a fitting portion that fits each other.

Further, the lower mold with radius of curvature having a cavity portion of the above convex surface to the plane 5inch, upper mold is a smooth surface radius of curvature has a concave curved surface of 5inch~ 100inch. Further, a shallow concave portion for stopping molten metal is provided at the center of the bottom surface of the cavity of the lower die.

In addition, a gap dimension T is 0.1 mm to 3.0 mm at a portion along the parting surface of the upper mold or the lower mold, and
A gap having a width W of 4.0 mm to 20.0 mm is provided to allow excess molten metal during molding to escape into the gap.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings showing embodiments.

FIG. 1 shows a production apparatus F for producing a metallic glass face used in the golf club of the present invention. The metallic glass face 1 produced by the producing apparatus F is:
Wood type golf club head 2 as shown in FIGS.
And an iron-type golf club head 3.
The golf club of the present invention is characterized in that it is manufactured by the method for manufacturing a metallic glass face described below.

First, the manufacturing apparatus F will be described. As shown in FIGS. 1 and 2, the manufacturing apparatus F includes a press die 6 including an upper die 4 and a lower die 5 and a cavity 7 of the lower die 5.
An arc electrode (tungsten electrode) 8 for arc-melting the metal material installed in the metal mold; a cooling water supply device 9 for circulating cold water to the upper die 4 and the lower die 5 of the pressing die 6 and the arc electrode 8; A vacuum chamber 10 for accommodating the mold 6 and the arc electrode 8, a lower mold moving mechanism 11 driven by a motor 13 and moving the lower mold 5 in a horizontal direction,
And an upper die moving mechanism 12 that is driven by 14 and moves the upper die 4 in the vertical direction.

The lower die moving mechanism 11 is not particularly limited, and a conventionally known translation mechanism or reciprocating mechanism can be used. For example, a drive screw using a ball screw and a traveling nut or an air cylinder can be used. A hydraulic mechanism such as a pneumatic mechanism or a hydraulic cylinder can be suitably used. Also, the upper die moving mechanism 12 is not particularly limited, and may be any conventionally known press die mechanism, such as a hydraulic mechanism or a pneumatic mechanism. Further, other cooling medium (for example, refrigerant gas) may be used other than the cooling water.

The arc electrode 8 is connected to an arc power supply 15 and is arranged at a slight angle to the depth of the cavity 7 of the lower die 5. The X-axis, Y-axis and Z-axis are driven by a stepping motor 16. It is configured to be adjustable in the axial direction. Further, the position of the metal material is measured by the semiconductor laser sensor 17 in order to keep the distance (Z-axis direction) between the metal material on the lower die 5 and the arc electrode 8 constant. The movement may be automatically controlled. This is because if the gap between the arc electrode 8 and the metal material is not constant, the arc becomes unstable and the melting temperature varies. Further, a cooling gas (for example, Ar gas) injection port may be provided in the vicinity of the arc generating portion of the arc electrode 8, and a cooling gas may be injected from a gas supply source (gas cylinder) 18 to promote rapid cooling after heating. .

The vacuum chamber 10 has a water cooling jacket structure made of SUS, and an oil diffusion vacuum pump (diffusion pump) 19 and an oil rotary vacuum pump (rotary pump) 20 are connected by a vacuum exhaust port to evacuate. The gas supply source (gas cylinder) 21 is connected by an argon gas inlet so that replacement with an inert gas is possible. Further, the cooling water supply device 9 cools the circulation return cooling water with the coolant, and then supplies the cooling water to the upper mold 4, the lower mold 5, and the arc electrode 8 again as cooling water.

As shown in FIGS. 2 and 3, the press die 6 has no fitting portion. More specifically, the upper die 4 has a smooth concave curved surface 23 having a radius of curvature of 5 inches to 100 inches, and a part thereof is a parting surface 22. The lower mold 5 has a cavity 7 having a convex curved surface with a radius of curvature of 5 inches or more, and a parting surface of the upper mold 4.
It has a convex parting surface 24 overlapping with 22. In the center of the bottom surface of the cavity 7, a shallow recess 7a for stopping molten metal is provided.

The portion along the parting surface 24 of the lower mold 5 has a gap size T (in a mold closed state) of 0.1 mm to 0.1 mm.
A gap 25 having a width of 3.0 mm and a width W of 4.0 mm to 20.0 mm
Is provided to allow excess molten metal during molding to escape into the gap 25. The press die 6 is not limited to this shape, and may have a shape shown in FIGS. 11 to 14, but will be described later in detail.

The method for manufacturing the metallic glass face will now be described. First, as shown in FIG. 4A, a metal material 26 is placed in the concave portion 7a of the cavity 7 of the lower die 5. In addition, as this metal material 26, Ln-Al-T
Ternary alloys such as M, Mg-Ln-TM, Zr-Al-TM, Zr-Al-Ni-Cu, Zr-Ti-Al-Ni
-Cu, Zr-Nb-Al-Ni-Cu and other alloys composed of almost any combination of elements, including quaternary or higher alloys, such as Zr-based alloys. It is preferable to use the alloy in the form of powder or pellets so that rapid melting by the electrode 8 and the arc power supply 15) is easier. However, if rapid melting is possible, the alloy may be in the form of a wire, band, rod, or block. May be used.

On the other hand, the position of the arc electrode 8 in the X-axis, Y-axis and Z-axis directions is adjusted by a laser sensor 17 and a stepping motor 16 via an adapter 8a, and a metal material is used.
26 (in the Z-axis direction) is set to a predetermined value.

The interior of the chamber 10 is set to a high vacuum, for example, 5 × by using an oil diffusion vacuum pump 19 and an oil rotary vacuum pump 20.
After setting the pressure to 10 ⁻⁴ Pa (using a liquid nitrogen trap), an Ar gas is supplied from an Ar gas supply source 21 so that
Replace with gas. The upper mold 4, the lower mold 5, and the arc electrode 8 are cooled by cooling water supplied from a cooling water supply device 9.

After the above preparation is completed, FIGS.
(B) As shown in (b), the lower die moving mechanism 11 is
Is driven to move the lower mold 5 in the horizontal direction (the direction of arrow A) and stop at a position below the arc electrode 8. And
When the arc power supply 15 is turned on, a plasma arc 27 is generated between the tip of the arc electrode 8 and the metal material 26, and the metal material
26 is completely dissolved to form molten metal 28. At this time, the molten metal 28 accumulates in the concave portion 7a of the cavity 7 and is stopped, and effectively receives the plasma arc 27.

Thereafter, as shown in FIGS. 1 and 4 (b) and (c), the arc power supply 15 is turned off to extinguish the plasma arc 27. Then, the lower die 5 was promptly moved to a position below the upper die 4 (in the direction of arrow B), and the upper die 4 was lowered (in the direction of arrow C) by the motor 14 and the upper die moving mechanism 12 to obtain the lower die 5. The molten metal 28 having a melting point or higher is pressed by the upper mold 4 and the lower mold 5 to be deformed into a predetermined shape. At this time, since the molten metal 28 is collected at the central portion of the cavity 7, the molding stability is improved. After or simultaneously with the deformation, the molten metal 28 is cooled by the cooled press die 6 at a critical cooling rate or higher, whereby the molten metal 28 is rapidly solidified to produce a metallic glass face 1 having a predetermined shape. Is done.

As shown in FIG. 5, during molding of the metallic glass face 1, excess molten metal flows into the void 25 (described above) provided in the lower mold 5, and is cooled and solidified. Thus, the burr portion 29 of the metallic glass face 1 is formed. In other words, the press die 6 has no fitting portion, and the gap 25 for absorbing excess molten metal is provided, so that the flow of the molten metal during pressurization by the press die 6 is reduced. There is no synergistic effect that the metal glass face 1 having a predetermined thickness can be reliably obtained without being stopped, thereby preventing the closing of the mold. Further, the mold 6 is not damaged by the burr portion 29, and the mold 6 can be used for a long time.

As described above, the thin plate-shaped metallic glass face 1 manufactured by the above-described method is a material which is formed by rapidly deforming a molten metal having a melting point or higher into a predetermined shape and cooling the same. It can be said that the amorphous face (metallic glass face) is excellent in strength characteristics such as high strength and high toughness without a crystal phase due to non-uniform solidification or non-uniform nucleation, and free from defects such as hot boundaries. That is, after the metal material is melted, the obtained molten metal having a melting point or higher can be pressed and molded without overlapping cooling interfaces having a melting point of the molten metal or lower.

Further, since the face 1a of the metallic glass face 1 is formed by the upper mold 4 having the concave curved surface 23,
The metal glass face 1 (face face 1a) can sufficiently function as a face of a club head that requires high strength characteristics because a golf ball collides directly. That is, the molten metal 28 melted in the cavity 7 of the lower die 5 is located above the lower die 5 in contact with the cooled lower die 5 until the upper die 4 descends and presses (time). Higher temperatures can be maintained. Therefore, when the molten metal 28 is pressed by the upper mold 4, the upper part in contact with the upper mold 4 is cooled more rapidly, so that an amorphous face with the face surface 1 a side reinforced further can be obtained.

Since the lower mold 5 is also heated somewhat during melting of the metal material 26, the portion of the molten metal 28 that is in contact with the lower mold 5 is compared with the portion cooled by the upper mold 4. Since the cooling degree is low, the amorphous phase may not be formed even after press molding and may remain as a crystalline phase. Also, in this part, a boundary line remains between the amorphous phase and the surrounding amorphous phase in appearance, and it is conceivable that even in the strength aspect, the boundary is not uniform with the surrounding amorphous phase, so that this crystalline phase region directly hits the ball. If it is on the side of the surface (face surface 1a), it is not preferable in terms of appearance and durability. The golf club manufacturing method according to the present invention solves this problem by disposing this crystal phase on the opposite side of the face surface 1a (the back surface side of the metallic glass face 1).

FIG. 6 (a) shows the metallic glass face 1 (semi-finished product) in a state where it is cut out from the press die 6.
Since this has the burr portion 29 on the outer peripheral edge 43,
As shown in FIG. 2B, the burr portion 29 is cut to finish the product.

At this time, as described with reference to FIGS. 2 and 3,
The gap dimension T of the gap 25 is set to 0.1 mm to 3.0 mm, and the width dimension W
Is set to 4.0 mm to 20.0 mm, a space capable of sufficiently absorbing excess molten metal is secured and the burr portion 29 is easily cut. The gap size T is 0.1m
If it is less than m, it is difficult for excess molten metal to flow into the void portion 25, and if it exceeds 3.0 mm, the burr portion 29 becomes too thick to make cutting difficult. If the width dimension W is less than 4.0 mm, it is difficult for the excess molten metal to be sufficiently absorbed in the gap 25, and if it exceeds 20.0 mm, the mold 6 becomes large. Also, face 1
Since the radius of curvature of the lower die 5 that forms a is 5 inches to 100 inches, and the radius of curvature of the upper die 4 is 5 inches or more, the post-processing for adjusting the bulge of the metallic glass face 1 after molding is performed. Not required. The radius of curvature of the lower mold 5 is 5
If it is less than inch, post-processing such as cutting and polishing to reduce the bulge of the face plate is required, and if it is larger than 100 inch, post-processing to attach the bulge is required.

FIGS. 7 and 8 show a golf club (an embodiment of the present invention) in which a hollow wood type (metal head) golf club head 2 is manufactured using a commercialized metallic glass face 1. ). More specifically, the head 2 includes a head main body 30 made of titanium, a titanium alloy, stainless steel, or the like, and the above-described fitting part 31 fitted to the fitting concave part 31 provided on the face surface 1a side of the head main body 30. Consists of a metallic glass face 1, 32 is a sole, 33
Is a side portion, 34 is a crown portion, and 35 is a neck portion. The metallic glass face 1 is fitted into the fitting recess 31 of the head body 30, and is made of an adhesive, welding, caulking (when fitting).
It is fixed by press fitting or the like. In addition, in FIG.
The bottom of 31 shows the case where it is connected to the whole,
It is not always necessary, and the center part is hollow (penetration)
It may be in a shape.

FIGS. 9 and 10 show a golf club (another embodiment) in which an iron-type golf club head 3 made of metal is manufactured using a commercialized metal glass face 1. FIG. The head 3 includes a head body 36 made of titanium, a titanium alloy, stainless steel, or the like, and a metallic glass face 1 fitted in a fitting recess 37 provided on the face surface 1a side of the head body 36. 38 is the sole, 39 is the back face, and 40 is the neck. The metal glass face 1 is fitted into the fitting recess 31 of the head main body 30 and is fixed by an adhesive, welding, or the like (as described above). Although FIG. 10 shows a case where the bottom surface of the fitting concave portion 31 is connected to the whole, it is not always necessary, and the central portion may be hollow (penetrated).

The golf club provided with the club head having the metallic glass face 1 thus obtained is
Since there is no variation in the characteristics, the strength characteristics such as high strength and high toughness are excellent, the yield is good, the manufacturing cost is reduced, and a metal glass face manufactured stably is used,
The reproducibility can be stably maintained even in the collision between the golf ball and the face, and as a result, excellent characteristics such as flight distance, directionality, impact characteristics, strength, and toughness can be exhibited.

Next, other shapes of the press die 6 will be described. In the press die 6 shown in FIG. 11, the upper die 4 has a parting surface 22 having a flat surface portion 22a and a concave curved surface portion 22b, and the lower die 5 has a parting surface 24 having a flat surface portion 24a and a convex curved surface portion 24b. It has. In the press die 6 shown in FIG. 12, the lower die 5 has a planar cavity 7, and the shallow concave portion 7a (see FIG. 11) on the bottom surface of the cavity 7 is omitted. . In addition,
A concave portion 7a may be provided on the plane of the cavity portion 7.

Further, a gap 25 provided in the press die 6 is provided.
The shape of is other than the shape shown in FIG.
As shown in FIG. 2B, a groove-shaped void portion 25 may be used. A gap 41 is provided so that the groove-shaped gap 25 communicates with the cavity 7 when the mold is closed.

Further, as shown in FIG.
May be provided. More specifically, the concave curved surface of the upper mold 4
The lower die 5 is provided with a concave portion 42 having a lower opening concave curved surface having a width dimension larger than the width dimension of the cavity portion 7 of the lower mold 5, and a portion of the concave portion 42 protruding from the cavity portion 7 on the outer peripheral side is defined as a gap portion. 25.

The present invention is not limited to the above embodiment. For example, the number of metal glass faces 1 manufactured at one time may be more than one.
The predetermined shape according to the present invention means not only a completely completed metallic glass face 1, but also a simple process such as a deburring process, whether it is a single shape or a series of multiple shapes. May be left.

The high-energy heat source for dissolving the metal material is not particularly limited. For example, typical examples include a high-frequency heat source, an arc heat source, a plasma heat source, an electron beam, a laser beam, and the like. These heat sources are supplied to the lower die 5 of the press die 6 by one.
The number may be one or more.

[0037]

Since the present invention is configured as described above, the following effects can be obtained.

According to the first aspect, a club head having a face excellent in high strength, high toughness, high impact resistance and the like can be obtained. In particular, since the face surface 1a colliding with the golf ball is provided with high strength characteristics, the use of the golf club (of the present invention) makes it possible to stably maintain reproducibility even when the golf ball collides with the face,
As a result, excellent characteristics such as flight distance, directionality, impact characteristics, strength, and toughness can be exhibited, and uniform characteristics can be exhibited without variation in characteristics.

(According to claim 2) The press die 6 is fitted.
Since there is no part, the upper mold 4 and the
Excess molten metal flows into the gap with the lower mold 5 to cool and solidify.
Damages the mold and melts in the damaged gaps
Metal can flow in (to prevent galling) and mold can be closed
Never be. Therefore, a metal of a predetermined shape and a predetermined thickness
The glass face 1 can be reliably obtained,
The life of the press die 6 is extended, and long-term use is possible.
You.

[0040] Since the portion in contact with (according to claim 3) lower mold 5 loses heat to the lower mold 5 metal material does not sufficiently soluble, although after molding also contemplated that the crystal phase, Even if such a crystal phase is formed, the portion is intentionally placed on the back side of the metallic glass face 1 (the opposite side of the face 1a).
And an amorphous phase can be arranged on the face surface 1a side where high strength characteristics are required. Therefore, it is possible to face surface 1a impinging directly with the golf ball high strength, obtained high toughness, good metallic glass face 1 to the high impact resistance.

[0041] In addition, according to the golf club of the process of the present invention, Ru can be produced with good reproducibility metallic glass face 1 at once simple process.

(According to claim 4) The press die 6 is fitted.
Since there is no part, the upper mold and lower mold
Excess molten metal flows into the gap between the mold and cools and solidifies,
This can damage the mold or cause molten metal to
Inflow (prevents galling) and mold cannot be closed
Never be. Therefore, a metal of a predetermined shape and a predetermined thickness
A glass face 1 can be obtained, and a mold
Long-term use is possible.

[0043] After (according to claim 5) molding, machining after polishing and cutting or the like for adjusting the bulge of metallic glass face 1 is not required.

When the metal material 26 placed in the cavity 7 of the lower mold 5 is melted by a high-energy heat source (according to claim 6 ), the molten metal 28 becomes concave due to its surface tension. 7a, and does not flow to a lower position on the outer peripheral side of the cavity portion 7. Therefore, the heat energy from the high energy heat source can be effectively applied to the molten metal 28 collected at the central portion of the cavity 7, and the molding stability by the press die 6 is improved, so that a high quality product can be obtained. Stable supply is possible. In addition, since the convex portion of the metallic glass face 1 formed in the concave portion 7a is located on the opposite side to the face surface 1a, it is not necessary to remove the convex portion by cutting or polishing.

(According to claim 7 ) Since the excess molten metal can be sufficiently absorbed at the time of molding by the gap 25 provided in advance in the press mold 6, the mold can be closed (without being hindered). 3.) Smooth, and the metallic glass face 1 having a predetermined thickness can be reliably obtained. Further, the cutting operation of the burr portion 29 is facilitated.

[Brief description of the drawings]

FIG. 1 is a configuration explanatory view of a manufacturing apparatus for manufacturing a metallic glass face used for a golf club of the present invention.

FIG. 2 is a sectional front view showing a press die.

FIG. 3 is an enlarged sectional view showing a main part of a press die.

FIG. 4 is an explanatory view showing a manufacturing process of a metallic glass face by the manufacturing apparatus.

FIG. 5 is an enlarged sectional view of a main part showing a closed state of a press die.

FIG. 6 is a cross-sectional view showing a molded metallic glass face having a predetermined shape.

FIG. 7 is a front view of a main part showing one embodiment of the golf club of the present invention.

FIG. 8 is a sectional side view.

FIG. 9 is a front view of a main part showing another embodiment of the golf club of the present invention.

FIG. 10 is a sectional side view.

FIG. 11 is a sectional front view showing another shape of the press die.

FIG. 12 is a sectional front view showing another shape of the press die.

FIG. 13 is a cross-sectional front view showing another shape of the gap.

FIG. 14 is a cross-sectional front view showing a press die in which a gap is provided in an upper die.

FIG. 15 is an operation explanatory view showing a conventional example.

FIG. 16 is an enlarged sectional view of a main part showing an incompletely closed state of the press die.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Metal glass face 4 Upper die 5 Lower die 6 Press die 7 Cavity part 7a Depression 22 Parting surface 23 Concave curved surface 24 Parting surface 25 Void 26 Metal material 28 Molten metal T Gap dimension W Width dimension

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Tetsuo Yamaguchi 3-4 Ishizaicho, Nishinomiya City, Hyogo Prefecture (72) Inventor Akihisa Inoue 35-35 Kawauchi Moto Hasekura, Aoba-ku, Sendai City, Miyagi Prefecture Kawauchi Residence 11-806 (56) References JP-A-11-76475 (JP, A) JP-A-9-187534 (JP, A)

Claims (7)

(57) [Claims] 1. A metal glass face 1 for a club head.
Wherein the metallic glass face 1 comprises a press die 6 comprising an upper die 4 having a smooth concave curved surface and a lower die 5 having a cavity 7.
The metal material 26 is placed on the upper mold 4 and the lower mold 5 by melting the metal material 26 using a high-energy heat source capable of melting the metal material 26 and melting the metal 28 having a melting point or higher. The molten metal 28 is deformed into a predetermined shape by pressing to cool the molten metal 28 at or above the critical cooling rate after or simultaneously with the deformation , and is formed by the concave curved surface of the upper mold 4.
A golf club, characterized in that it is a metallic glass face 1 having the face formed as a face face 1a . 2. The golf club according to claim 1, wherein the upper mold 4 and the lower mold 5 do not have a fitting portion for fitting each other. 3. A metal material 26 is placed on the lower die 5 of a press die 6 comprising an upper die 4 having a smooth concave curved surface 23 and a lower die 5 having a cavity 7, and the metal material 26 is melted. Melting the metal material 26 using a possible high energy heat source,
The molten metal 28 having a melting point or higher is pressed by the upper mold 4 and the lower mold 5 to be deformed into a predetermined shape, and after or simultaneously with the deformation, the molten metal 28 is cooled at a critical cooling rate or higher and golf is performed. The concave shape of the upper die 4 has a predetermined shape for the club head.
A method for manufacturing a golf club, comprising manufacturing a metallic glass face 1 having a face formed by a face as a face face 1a . 4. The golf club manufacturing method according to claim 3, wherein the upper mold 4 and the lower mold 5 do not have a fitting portion for fitting each other. 5. The lower mold 5 has a convex or flat cavity portion 7 having a curvature radius of 5 inches or more, and the upper mold 4 is a smooth surface having a concave curved surface 23 having a curvature radius of 5 inches to 100 inches. Or the manufacturing method of the golf club of 4. 6. At the center of the bottom of the cavity 7 of the lower mold 5,
6. The method for manufacturing a golf club according to claim 3, further comprising a shallow recessed portion 7a for stopping molten metal. 7. Parting surface 2 of upper mold 4 or lower mold 5
The gap T is 0.1mm to 3.0mm along the area along 2,24.
A gap 25 having a width W of 4.0 mm to 20.0 mm is provided to allow excess molten metal 28 during molding to escape into the gap 25. Golf club manufacturing method.