JPH0716536B2 - Iron club head 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 method for manufacturing an iron club head.

[0002]

2. Description of the Related Art A conventional iron club head manufacturing method is, in addition to a method for forming a single piece by forging, forming a shell of a club head by forming a metal plate into a plurality of formed members by pressing and welding the shell. For example, there is a method in which a hollow club head is joined by such a method as described above, and a filling material is put in the hollow portion. As for the latter method, Japanese Patent Publication No. 39-21879 discloses a method of injecting and filling a molten metal such as zinc into the hollow portion of the club head formed by joining the shells.

Further, Japanese Patent Application No. 2-2637 proposed by the present applicant.
In No. 45, a face member 1 and a back member 2 as shown in FIGS. 2 and 3 are formed by pressing etc. as the forming members, and these are joined to form an integrated club head shell, and a neck portion is formed. A method of manufacturing a club head having a desired loft angle by bending at a predetermined angle is disclosed. In Fig, 1 _a the face portion, 2 _a the rear part, 1 _b, 2
_b is a neck portion, 1 _c and 2 _c are joint surfaces, and 2 _d is a sole portion.

[0004]

However, in the above method, a general metal such as zinc shrinks when it is condensed from a liquid phase in a molten state and becomes a solid phase, so that there is a gap in the hollow portion. This may cause cracks or the like, impair the stability and reliability of the head, and may cause an uncomfortable feeling such as generating an abnormal sound during a swing.

In view of the above points, it is an object of the present invention to provide a method of manufacturing a club head which does not cause a gap in the hollow portion when a metal weight is filled in the hollow portion. is there.

[0006]

To achieve the above object, in the present invention, in a hollow portion of a hollow iron club head in which a plurality of molding members are joined to form an outer shell,
There is provided a method for manufacturing an iron club head, characterized in that a heavy metal body that forms a eutectic bond with the inner wall of the hollow portion is filled in a high temperature atmosphere.

Further, it is convenient to plate a metal, which is eutectic-bonded with the metal weight, in the hollow portion of the iron club head before the molding member is bonded.
Further, the metal weight body may be a sintered metal or a molten metal.

[0008]

According to the present invention, the metal weight filled in the hollow portion of the club head is eutectic-bonded with the inner wall of the hollow portion, so that the hollow portion is filled with no cracks or cracks and is reliably filled. The center of gravity and balance of the club head are stabilized, and the club head is in a state where it is easy to swing (easy to swing).

[0009]

Embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows an example of a hollow iron club head in which a plurality of molding members are joined to form an outer shell. The same parts as those of the club head shown in FIGS. 2 and 3 are designated by the same reference numerals. FIG. 1A is a front view of a club head,
(B) shows a lower drawing and (c) shows a side view. The fabrication of the club head, previously Dzu, a face portion 1 _a, a cylindrical and face member 1 having a neck portion 1 _b of the half-shaped, rear portion 2 _a and the half-shaped neck portion 2 _b The back member 2 including the sole portion 2 _d and the back member 2 including the sole member 2 _d are formed by sheet metal working such as punching and drawing of a press, and then the two molding members 1 and 2 are integrated by welding, brazing, or the like. To form an outer shell of an iron club head having a hollow portion 3.

Next, as an example of eutectic bonding of the metal weight with the inner wall of the hollow portion, the hollow portion 3 is filled with a metal powder for sintering which has fluidity with a binder (bonding agent). And pressurize, heat and sinter to eutectic bond with the inner wall 3 _{a of the} hollow portion 3. Further, as another example of eutectic bonding, in a high temperature atmosphere, the metal weight M that is eutectic bonded to the inner wall 3a of the hollow part 3 is injected into the hollow part 3 in _a molten state and is pressurized to fill the hollow part 3. The inner wall 3 _{a of the} portion and the filled metal weight M are eutectic bonded.

Metals that are likely to form eutectic bonds with each other include, for example,
Copper and aluminum, copper and tin, etc. Therefore, when the outer shell is made of stainless steel, titanium, etc., the eutectic reaction does not occur up to this point, so the metal to be sintered on the inner wall of the hollow part. Alternatively, a metal that causes a eutectic reaction with the metal to be melted is plated. For example, when copper powder is used as the metal to be sintered, aluminum plating may be applied.

By the above-mentioned means, by filling the hollow portion with a metal weight body that is eutectic-bonded with the inner wall of the hollow portion, even if the filled molten metal in the liquid phase becomes a solid phase and contracts, the metal remains There is no gap or crack in the hollow part away from the inner wall of the hollow part, the stability and reliability of the club head are secured, and there is no abnormal sound or discomfort during a swing, and it is an iron that is easy to swing. You get a club.

[0013]

According to the present invention, when the metal weight is filled in the hollow portion of the hollow iron club head, no gap or crack is generated in the hollow portion, and the metal weight is not unevenly distributed in the hollow portion. Are evenly distributed over the surface, which provides a stable and reliable club head.

Further, an abnormal sound is not generated during a swing and a feeling of strangeness does not occur, and an iron club which is easy to swing can be obtained.

[Brief description of drawings]

FIG. 1 shows a hollow iron club head according to an embodiment of the present invention, (a) is a front view of the club head, (b) is a bottom view, and (c) is a side view.

FIG. 2 shows a half-faced member of a hollow iron club head according to the prior art, which is not yet joined to a molded member;
Is a front view thereof, and (b) is a top view thereof.

3A and 3B show a half-divided rear member of a hollow iron club head according to the prior art before joining a molded member, wherein FIG. 3A is a front view thereof, and FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Face member 2 ... Back surface member 3 ... Hollow part 3a ... Inner wall 10 ... Iron club head

Claims (4)

[Claims] 1. A hollow iron club head having an outer shell formed by joining a plurality of molded members is filled with a heavy metal body that forms an eutectic bond with the inner wall of the hollow portion in a high temperature atmosphere. A method for manufacturing an iron club head, comprising: 2. The iron club according to claim 1, wherein the inner wall of the hollow portion of the iron club head is plated with a metal that forms a eutectic bond with the metal weight body before the molding member is joined. Head manufacturing method. 3. The method of manufacturing an iron club head according to claim 1, wherein the metal weight body is a sintered metal. 4. The method of manufacturing an iron club head according to claim 1, wherein the metal weight is a molten metal.