JPH11206929A - Iron head and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent rust from occurring on the outer surface of a head and a weight from falling apart, and improve appearance. SOLUTION: The main body 12 of an iron head 10 is formed of titanium of a low specific gravity metal, and has a cavity 16 on the rear side opposite to a face 14 which becomes a ball hitting face. A weight 20 formed of a metal having a higher specific gravity than that of titanium forming the main body 12 is inserted into a hole 22 made near the sole of the main body 12 and open rearward. Overlaying is performed to the rear side facing outward of the hole of the weight 20, thereby blocking the hole 22 completely. A welding material used for overlaying is titanium, the same material as for the main body 12. No border appears between the welded portion 24 and the main body 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an iron head having a main body formed of a low specific gravity metal such as titanium, and a method of manufacturing the same.

[0002]

2. Description of the Related Art Iron heads used in golf are:
Conventionally, a head made of an iron-based material such as stainless steel or soft iron has been widely used. In recent years, a head using a non-ferrous material such as titanium or a titanium alloy has been used. Since titanium and titanium alloys are excellent in strength and lightweight,
Even with the same weight as a conventional iron-based material, the face of the head can be designed to be large, and a head that can be easily hit can be obtained.
Also, with iron heads using titanium or titanium alloy,
A separate weight formed of a metal having a higher specific gravity than the metal forming the main body is pressed into the rear part near the sole of the main body, shrink fit,
There has been proposed a method of joining by brazing, screwing, or the like, thereby setting the center of gravity of the head at a low position, increasing the trajectory of the hit ball, and obtaining a hit ball that easily stops.

[0003]

Regardless of the method used to join the iron head body and the weight, the weight is exposed on the outer surface of the head. There is a problem that rust is generated at the joint due to the difference. In particular, when the joining method is press-fitting, shrink-fitting, or screwing, there is a possibility that the joint may be loosened and the weight may move or fall off due to repeated hitting of the head with the ball. Further, since the weight and the main body are separate from each other, it is pointed out that the appearance is inferior and the commercial value is reduced.

[0004]

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above-mentioned drawbacks inherent in the prior art, and has been proposed to solve the problem suitably. Rust is generated on the outer surface of the head or the weight falls off. An object of the present invention is to provide a good-looking iron head and a method for manufacturing the same.

[0005]

SUMMARY OF THE INVENTION In order to overcome the above problems and appropriately achieve the initial object, an iron head according to the present invention is a golf iron head having a main body formed of a low specific gravity metal, Inside the body near the sole,
A weight formed of a high specific gravity metal having a higher specific gravity than the low specific gravity metal forming the main body is buried in a state where it is not exposed.

[0006] In order to overcome the above-mentioned problems and appropriately attain the initial object, a method of manufacturing an iron head according to another invention of the present application provides a method of manufacturing an iron head in the vicinity of a sole of a main body made of a low specific gravity metal, opposite to a face. Form a hole that opens backward,
In the hole, a weight made of a high specific gravity metal having a higher specific gravity than the low specific gravity metal forming the main body is inserted, and the rear surface of the weight is subjected to overlay welding using a welding material of the same material as the main body. It is characterized in that the weight and the main body are joined together, and the hole is closed in a state where there is no boundary between the welded portion and the main body.

[0007] In order to overcome the above-mentioned problems and appropriately achieve the initial object, a method of manufacturing an iron head according to still another invention of the present application is to provide a method for manufacturing an iron head in the vicinity of a sole of a main body made of a low specific gravity metal. Forming a hole that opens to the opposite rear, and inserting a weight made of a high specific gravity metal having a higher specific gravity than the low specific gravity metal forming the main body in the hole,
A lid made of the same material as the main body is inserted into a hole outside the weight, and the lid and the main body are joined using a welding material of the same material as the main body, and the welded portion is joined to the main body and the lid. It is characterized in that the hole is closed in a state where there is no border between the two.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Next, preferred embodiments of an iron head and a method of manufacturing the same according to the present invention will be described.
This will be described in detail with reference to the accompanying drawings.

[0009]

FIG. 1 shows an iron head according to a preferred first embodiment of the present invention, wherein a main body 12 of the head 10 is formed of titanium, which is a low specific gravity metal, as a material. A cavity 16 of a required size is formed in a recess on a rear surface side opposite to the face 14 having a required angle serving as a hitting surface of a golf ball. Further, between the formation position of the cavity 16 in the main body 12 and the sole 18, the main body 1 is provided.
A weight 20 made of a high specific gravity metal having a higher specific gravity than titanium, which is a metal forming the metal 2, is buried so as not to be exposed on the main body surface (see FIG. 2). That is, the hole 2 is formed near the sole of the main body 12 and opened rearward.
2, the weight 20 is inserted, and the back surface of the weight 20 facing the outside of the hole portion is subjected to build-up welding, so that the hole portion 22 is completely closed. In addition, as the welding material to be overlay-welded, titanium, which is the same material as the main body 12, is used, and the boundary between the welded portion 24 and the main body 12 is not shown.

As described above, the weight 20 made of a material different from that of the main body 12 is not exposed to the surface of the main body 12, so that no rust is generated, and the weight 2 is repeatedly hit.
There is no risk that the 0 will fall off without moving or loosening. Moreover, since the weight 20 is not visible from the outside, the commercial value can be improved without impairing the appearance of the head itself. The weight 20 may be formed of, for example, titanium (tungsten or tantalum) such as titanium (main body 12).
A metal that can be welded with the material that forms the metal is preferably used.

FIG. 3 shows a manufacturing process of the iron head 10 according to the first embodiment. First, a hole 22 of a required size which is opened rearward near the sole 18 of the main body 12 made of titanium is provided. At a required depth toward the face 14 so as to be substantially parallel to the sole 18 (FIG. 3).
(a)). A weight 2 made of a high specific gravity metal is formed in the hole 22.
0 is inserted (FIG. 3B). Since the weight 20 faces substantially parallel to the sole 18 as shown in the figure, the low center of gravity of the weight 20 is maintained. Next, using a welding material made of titanium, which is the same material as the main body 12, a build-up welding is performed on the rear surface of the weight 20 so as to close the hole 22 (FIG. 3C). Then
The welded portion 24 is polished so that the outer surface of the main body 12 is smooth without any step. At this time, since the same material as that of the main body 12 is used as the welding material, there is no boundary between the two parts 12 and 24, and the head 10 has an appearance as if it were an integral body. Therefore, as described above, the iron head 10 having an excellent appearance without rusting at the joint portion 24 and without falling off the weight 20 can be obtained.

[0012]

Second Embodiment FIG. 4 shows an iron head according to a second embodiment. The basic structure of the head 30 is the same as that of the first embodiment, but the hole 2
2 differs in that it is closed by a lid 32.
The same parts as those in the first embodiment are denoted by the same reference numerals.

That is, a hole 22 formed between the sole 18 and the position where the cavity 16 is formed in the main body 12 made of titanium as a low specific gravity metal and opened rearward.
The weight 20 made of a metal having a high specific gravity is inserted into the hole 2, and the lid 32 is inserted into the hole 22 outside the weight 20, and the hole 2 is inserted.
2 is closed. The lid 32 is made of titanium of the same material as the main body 12, and the lid 32 is
Is welded to the main body 12 by a welding material made of titanium of the same material as that of the above. Therefore, no boundary appears at the welded portion 34 between the main body 12 and the lid 32, and a good appearance is exhibited. And the iron head 30 according to the second embodiment.
Also, the weight 20 made of a different material from the main body 12 is not exposed to the outside, so that rust does not occur on the outer surface of the head 30. Also, the weight 20 does not move or fall off due to repeated hits, and a good shot can always be expected.

The weight 20 of the second embodiment is W-
Fe-Ni, W-Fe-Ni-Co, W-Cu-Ni, brass and the like are preferably used. In addition, the weight 20
And the main body 12 are not directly welded.
As long as the metal has a specific gravity greater than 2, a material that cannot be welded to a welding material (titanium) may be used.

FIG. 5 shows a manufacturing process of the iron head 30 according to the second embodiment. First, a hole 22 of a required size which is opened rearward near the sole 18 of the main body 12 made of titanium is provided. At a required depth so as to be substantially parallel to the sole 18 toward the face 14 (FIG. 5).
(a)). A weight 2 made of a high specific gravity metal is formed in the hole 22.
0 is inserted (FIG. 5B). Since the weight 20 faces substantially parallel to the sole 18 as shown in the figure, the low center of gravity of the weight 20 is maintained. Further, the hole 22 outside the weight 20
Then, a lid 32 made of titanium made of the same material as the main body 12 is inserted and the hole 22 is closed (FIG. 5C).

Next, the lid 32 and the main body 12 are welded using a welding material made of titanium of the same material as the main body 12.
(FIG. 5 (d)). Next, the welded portion 34 is polished so that the outer surface of the main body 12 and the outer surface of the main body 12 do not have a level difference. At this time, since titanium of the same material as that of the main body 12 and the lid 32 is used as the welding material, no boundary appears between the welded portion 34 and the main body 12 and the lid 32, and the head 30 is an integral member. The appearance is as follows. Therefore, as described above, the iron head 30 having an excellent appearance without rusting on the welded portion 34 and without falling off the weight 20 can be obtained.

In the first and second embodiments described above, the case where the main body 12 of the iron heads 10, 30 is formed of titanium has been described. However, the present invention is not limited to this. Heavy metals can be suitably used. When the main body 12 is formed of a titanium alloy or aluminum in the first embodiment, a corresponding titanium alloy or aluminum is used as a welding material. In the second embodiment, the main body 12 is formed of a titanium alloy or aluminum. If formed,
As the lid 32 and the welding material, a titanium alloy or aluminum is used correspondingly. When a titanium alloy is used, the content of titanium in the alloy is at least 5%.
The content is 0% by weight or more, preferably 60% by weight or more, and vanadium, aluminum, chromium, or the like can be used as an alloying element.

In the first and second embodiments, one weight 2
0 is buried in the main body 12, but a plurality of weights may be buried in a state separated by a predetermined distance.

[0019]

As described above, according to the iron head and the method of manufacturing the same according to the present invention, since the weight is not exposed to the outside, no rust is generated on the outer surface, and the weight is repeatedly applied to the weight. They do not move or fall off. Therefore, the ball can always be hit in an appropriate state. Also, since the weight as a separate member is not exposed, there is an advantage that the appearance is good and the commercial value can be improved.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an iron head according to a first preferred embodiment of the present invention.

FIG. 2 is a rear view of the iron head according to the first embodiment.

FIG. 3 is an explanatory view showing a manufacturing process of the iron head according to the first embodiment.

FIG. 4 is a sectional view showing an iron head according to a second preferred embodiment of the present invention;

FIG. 5 is an explanatory diagram showing a manufacturing process of the iron head according to the second embodiment.

[Explanation of symbols]

 12 Body 14 Face 18 Sole 20 Weight 22 Hole 24 Weld 32 Lid 34 Weld

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Tetsuo Hayashi 15-1-4-2, Shoheidaira, Hiratsuka-shi, Kanagawa (72) Inventor Akira Katahira 2-14-13, Higashi-Oba, Mishima-shi, Shizuoka

Claims (7)

[Claims] 1. A golf iron head in which a main body (12) is formed of a low specific gravity metal, wherein the low specific gravity metal forms the main body (12) inside a vicinity of a sole (18) of the main body (12). An iron head characterized in that a weight (20) formed of a high specific gravity metal having a higher specific gravity is buried without being exposed. 2. The weight (20) is inserted into a hole (22) formed in the main body (12) and opened rearward, and the hole (22) is formed of the same material as the main body (12). 2. The iron head according to claim 1, wherein the iron head is closed by a material. 3. The weight (20) is inserted into a hole (22) formed in the body (12) and opened rearward, and the body (12) is
2. A lid (32) made of the same material as that of the main body (12), and the lid (32) and the main body (12) are welded with a welding material made of the same material as the main body (12). Iron head. 4. The iron head according to claim 1, wherein the low specific gravity metal is a titanium-based metal. 5. The iron head according to claim 1, wherein the high specific gravity metal is a tungsten-based metal. 6. A hole (22), which is open to the rear opposite to the face (14), is formed near the sole (18) of the main body (12) made of a low-density metal; ), A weight (20) made of a high specific gravity metal having a higher specific gravity than the low specific gravity metal forming the main body (12) is inserted, and the weight (20) is welded using the same material as the main body (12). The weight (20) is joined to the main body (12) by overlay welding on the rear surface of the hole (22) in a state where there is no boundary between the weld (24) and the main body (12). A method of manufacturing an iron head, characterized in that the iron head is closed. 7. A hole (22) which is open to the rear opposite to the face (14) is formed near the sole (18) of the main body (12) made of a low specific gravity metal, ), A weight (20) made of a high specific gravity metal having a higher specific gravity than the low specific gravity metal forming the main body (12), and the main body (12) is inserted into a hole (22) outside the weight (20). And a lid (32) made of the same material as the main body (12).
And the main body (12) are joined so as to close the hole (22) in a state where there is no boundary between the welded portion (34) and the main body (12) and the lid (32). Iron head manufacturing method.