JPH11333031A - Manufacture of face plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To thin a faceplate while securing its strength by providing a projecting part on either one of an upper die and a lower die for forming and a recess part corresponding to the projecting part on the other side and by manufacturing the faceplate with the recess part formed on the surface through pressurization by interposing a face material between them. SOLUTION: A flat face material 21 made of a rolled stock is interposed between an upper die 27 and a lower die 29 for forming a faceplate. A plural of projecting parts 31 for forming a score line groove are formed on the side of a back 27a of the upper die 27, while a plurality of recess parts 33 for forming a reinforcing rib corresponding to each of the projecting parts 31 on a cavity bottom 29a of the lower die 29 on which the face material 21 is placed. The cavity bottom 29a is formed flat other than the recess parts 33 so as to prevent looseness of the placed face material 21. The face material 21 is placed on the cavity bottom 29a of the lower die 29 and it is pressurized by the upper die 27 so as to manufacture the face plate 21 with a score line groove 23 formed on a surface 21a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a face plate to be mounted on a head body of a golf club head.

[0002]

2. Description of the Related Art In recent years, a golf club head called a wood has been replaced with a natural wood such as a persimmon or a cherry tree, instead of a natural wood such as a persimmon or a cherry tree, from the viewpoint of quality stability and ease of material supply. What is molded into a hollow with the above metal is widely used. In order to increase the coefficient of restitution at the time of hitting the ball and secure a flight distance, a face plate formed of titanium alloy or the like is attached to the face portion of the head body, but recently, with the enlargement of the golf club head, This tends to make the head body and face plate thinner.

For this reason, a hand for reinforcing the face plate is required. Japanese Utility Model Laid-Open Publication No. Hei 6-31766 discloses that a reinforcing rib is provided on the back side of the face plate in accordance with the position of the score line groove by casting. A golf club head is disclosed, and Japanese Patent Application Laid-Open No. 9-38248 discloses a thin face plate 1 formed by forging a plurality of depressions 3 on the back surface 1a side of the face plate 1 as shown in FIG. A wood golf club head 5 with improved strength is disclosed.

In this conventional example, as shown in FIG. 6, a face material 1-1 having both surfaces made flat by forging is placed in a cavity 7a provided in a lower die 7 of a forging device, and then a depression 3 is formed. The upper die 11 having a hemispherical projection 9 provided on the lower surface thereof is pressed against the back surface 1a-1 of the face material 1-1 to simultaneously form a plurality of depressions 3.

[0005]

However, since the cast face plate has insufficient strength as compared with a forged product, it cannot be made thinner, and it is said that the limit is about 3 mm.

On the other hand, as shown in FIG. 6, a method of manufacturing a face plate 1 in which an upper mold 11 is pressed against a face material 1-1 placed on a lower mold 7 is performed. 7, the surface 1b of the face material 1-1 excluding the concave portion 12 is deformed by the forging pressure flow as shown in FIG. 7, so that the surface 1b side needs to be finally polished flat as shown by a broken line. There is.

[0007] However, when the face plate 1 is forged and press-formed as described above, the portion having the highest strength due to the composition of the metal material is located on the outer side, but the outer side is strong. It has been pointed out that if the surface is polished, the strength of the face plate 1 is reduced.

The present invention has been devised in view of the above circumstances, and has as its object to provide a method of manufacturing a face plate that can reduce the thickness while securing sufficient strength of the face plate.

[0009]

According to a first aspect of the present invention, there is provided a method of manufacturing a face plate, wherein a convex portion is provided on one of an upper die and a lower die for molding a face plate, and The present invention is characterized in that a concave portion corresponding to the convex portion is provided, and a face material is interposed between the concave portions and pressure is applied to manufacture a face plate having a concave portion formed on the surface.

The invention according to claim 2 is based on claim 1.
In the method for manufacturing a face plate described in the above, a concave portion is formed on the lower die corresponding to the convex portion provided on the upper die, and a portion excluding the concave portion is formed flat, and the face material is formed on the lower die. The method is characterized in that a face plate having a concave portion formed on the surface is manufactured by placing the flat plate on a flat portion and pressing the flat plate with an upper die.

According to a third aspect of the present invention, in the method for manufacturing a face plate according to the first or second aspect, a rolled material is used as the face material, and the rolled material is divided into an upper mold and a lower mold. A face plate having a thickness of not more than 2.6 mm with a concave portion formed on the surface is manufactured by interposing and pressurizing the interposed portion, and the invention according to claim 4 is characterized in that the face plate has a recess. Item 3. In the method for manufacturing a face plate according to any one of Items 3, the face material is interposed between the upper die and the lower die, and the face material is pressurized.
A face plate having an area of 2700 mm ² or more with a concave portion formed on the surface is manufactured.

(Function) According to the present invention, when a face material is interposed between an upper mold and a lower mold and is pressed, the face material is plastically deformed and a concave portion (score line) is formed on the surface. Although a face plate having grooves and punch marks formed therein is manufactured, since the upper and lower dies are provided with corresponding projections and depressions, the so-called “escape” of a face material in which the depressions of the die are plastically deformed. The face material functions as a “forming recess”, and the face material is plastically deformed into the recess and a convex portion is formed on the back surface side of the face material.

In the invention according to claim 3, the face material made of the rolled material is pressed by the upper mold and the lower mold to 2.6 m.
m is manufactured,
In the invention according to claim 4, a face plate having an area of 2700 mm ² or more is manufactured. According to the second aspect of the present invention, the face material is placed on the flat portion of the lower mold and pressed by the upper mold, whereby a face plate having a concave portion formed on the surface is manufactured. It will be.

[0014]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a golf club head equipped with a face plate manufactured by a manufacturing method according to an embodiment of the present invention. In the figure, reference numeral 13 denotes a hosel portion made of a metal material such as stainless steel or titanium. The head main body 13 is a hollow main body integrally formed with the outer shell 15, the sole part 17, the top part 19, and the like. The head main body 13 has a shaft hole (not shown) of the hosel part 15 and a face part opened. I have. Then, the face portion is formed of a rolled material such as titanium, a titanium alloy, stainless steel, or an aluminum alloy, and has a thickness of 2.6 m (excluding a score line groove 23 and a reinforcing rib 25 described later).
A large, hollow golf club head 22 having a volume of 250 cc is formed by welding a face plate 21 having an area of 3,500 mm ² of m.

As shown in FIG. 2, a plurality of score line grooves (recesses) 23 are formed on the surface 21a of the face plate 21 in the toe and heel directions of the head body 13, and each score line groove is formed. A plurality of reinforcing ribs (convex portions) 25 are formed on the back surface 21b of the face plate 21 in the toe and heel directions of the head main body 13 in correspondence with the face plate 21. Reinforcement is planned.

The face plate 21 is manufactured as follows by one embodiment of the manufacturing method according to the first to fourth aspects. First, as shown in FIG. 3, a smooth face material 21-1 made of a rolled material such as titanium, a titanium alloy, stainless steel, or an aluminum alloy is interposed between an upper mold 27 and a lower mold 29 for forming a face plate.

A plurality of convex portions 31 for forming score line grooves are formed on the back surface 27a side of the upper die 27, and a cavity bottom portion 29a of the lower die 29 on which the face material 21-1 is placed is provided with A plurality of concave portions 33 for reinforcing rib molding are formed corresponding to the convex portions 31. As shown in the figure, the cavity bottom portion 29a is formed flat except for the concave portion 33 to prevent the mounted face material 21-1 from rattling.

Then, as shown in FIG. 4, the face material 21-1 is placed on the cavity bottom 29a of the lower mold 29 and is pressed by the upper mold 27, whereby the face material 21-1 is plastically deformed. The face plate 21 in which the score line groove 23 is formed on the surface 21a is manufactured.
Since the concave portion 33 is formed in the lower die 29 corresponding to the convex portion 31 of the so-called “7”, the concave portion 33 is compressed by the upper die 27 and the lower die 29 and is plastically deformed, so-called “so-called“ The face material 2 functions as a “recess forming recess” and corresponds to the score line groove 31 formed by pressing the upper mold 27.
1-1 is plastically deformed into the recess 33, and the score line groove 23 is deformed.
At the same time, the reinforcing rib 25 is formed on the back surface 21b.

As described above, in the present embodiment, the concave portion 33 is formed in the lower die 29 corresponding to the convex portion 31 of the upper die 27, and the concave portion 33 is compressed by the upper die 27 and the lower die 29. Since it was made to function as a "recess forming recess" of the face material 21-1 which is plastically deformed, as shown in FIG.
Of the surface 21a of the surface "distortion such as uplift and depression due to forging flow"
However, as compared with the conventional example shown in FIG. 7, it is almost unnecessary to grind the outer surface of the face plate 21, which is the strongest part, or the amount of polishing can be significantly reduced. Become.

Furthermore, with the formation of the score line groove 23,
The convex portion plastically deformed into the concave portion 33 is the face plate 21.
In addition to functioning as a reinforcing rib 25 for reinforcing the steel, sufficient strength can be ensured. Therefore,
If the face plate is manufactured by the manufacturing method according to the present embodiment, the thickness can be reduced to 2.6 mm, and as a result, a large face plate 21 having an area of 3500 mm ² can be formed and a large-sized face plate having a volume of 250 cc can be formed. The golf club head 22 can be manufactured.

In this embodiment, the score line groove 2
3 and the reinforcing rib 25 can be formed at the same time,
Since the manufacturing process and cost can be reduced, and the cavity bottom 29a excluding the concave portion 33 is formed flat, the lower mold 29 can be formed without rattling the face material 21-1.
And the score line groove 23 can be formed with high accuracy.

In the above embodiment, the upper die 27 and the lower die 2
The score line groove 2 corresponds to the convex portion 31 and the concave portion 33 corresponding to 9.
3 and the reinforcing ribs 25 are formed simultaneously. The upper die 27 and the lower die 29 are provided with the convex portions 31 and the concave portions 33 corresponding to each other, and the punch marks and the reinforcing convex portions are formed on the face plate at the same time. It is also possible.

[0023]

As described above, according to the method of manufacturing a face plate according to each claim, by providing the projections and the depressions in the upper die and the lower die in correspondence with each other, the depressions are formed in the upper die and the lower die. Since it was made to function as a "recess forming recess" of the face material that is plastically deformed by being compressed by the lower mold, "distortion such as uplift and depression due to forging flow" on the face plate surface is reduced as compared to the past, and as a result There is almost no need to grind the outer surface of the face plate, which is the strongest part in strength,
Alternatively, the polishing amount can be significantly reduced.

In addition, as the concave portion is formed on the front surface of the face plate, the convex portion formed on the rear surface side of the face plate by plastic deformation is intended to reinforce the face plate. It is possible to ensure sufficient strength. Therefore, as in the invention according to claim 3, it is possible to manufacture a thin face plate having a thickness of 2.6 mm or less, and the thickness can be reduced as described above.
As in the invention according to claim 4, a wide face plate having an area of 3500 mm ² can be manufactured and used for a golf club head.

According to the second aspect of the present invention, since the lower mold is formed flat except for the concave portion, the face material can be placed on the lower mold without rattling, and the surface of the face plate can be mounted. The concave portion can be formed with high accuracy.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a golf club head to which a face plate manufactured by a manufacturing method according to an embodiment of the present invention is mounted.

FIG. 2 is a sectional view of a main part of a face plate.

FIG. 3 is a cross-sectional view of an upper die, a lower die, and a face material used in the manufacturing method according to one embodiment of the present invention.

FIG. 4 is a cross-sectional view of a face material pressed by an upper die and a lower die.

FIG. 5 is a cross-sectional view of a golf club head equipped with a conventional forged face plate.

FIG. 6 is a cross-sectional view of an upper die, a lower die, and a face material used in a conventional face plate manufacturing method.

FIG. 7 is a cross-sectional view of a face material pressed by an upper die and a lower die.

[Explanation of symbols]

 13 Head Body 21 Face Plate 21-1 Face Material 22 Golf Club Head 23 Score Line Groove 25 Reinforcement Rib 27 Upper Die 29 Lower Die 31 Convex 33 Concave

Claims (4)

[Claims] 1. A convex portion is provided on one of an upper die and a lower die for forming a face plate, and a concave portion corresponding to the convex portion is provided on the other, and pressure is applied by interposing a face material between these. A method of manufacturing a face plate having a concave portion formed on a surface thereof. 2. A lower die is formed with a concave portion corresponding to the convex portion provided on the upper die, a portion excluding the concave portion is formed flat, and a face material is placed on the flat portion of the lower die. 2. A face plate having a concave portion formed on its surface by pressurizing the face plate with an upper die.
The manufacturing method of the face plate described. 3. A rolled material is used as a face material, and the rolled material is interposed between an upper die and a lower die, and is pressed to reduce the thickness of the surface to a depth of 2.6 mm or less. The method for manufacturing a face plate according to claim 1, wherein the face plate having the face plate is manufactured. 4. A face plate having an area of 2700 mm ² or more with a concave portion formed on a surface thereof, by interposing a face material between an upper mold and a lower mold and pressurizing the face material. The method for manufacturing a face plate according to any one of claims 1 to 3, wherein: