JPH119733A - Golf club head manufacturing method - Google Patents

Abstract

(57) [Problem] To reduce the occurrence of product defects by preventing the occurrence of defective connections when joining pieces after sintering. SOLUTION: The method for manufacturing a golf club head according to the present invention is directed to a method for manufacturing a golf club head.
In the method of manufacturing the golf club head 12 by bonding the metal powder to the
The green compacts 13 and 14 having substantially the same shape as the green compacts 3 and 14 are formed, and the green compacts 13 and 14 are combined with the shape of the golf club head 12 and sintered to form the piece 1.
3, 14 is obtained. For this reason, the joining surface 13t of the front green compact 13 and the joining surface 1 of the rear green compact 14
4t are in surface contact with each other, and are sintered in a state where the sintering temperature distributions are almost equal. For this reason, both joining surfaces 1 during sintering
The shrinkage ratios of 3t and 14t are almost equal, and after sintering, when the pieces 13 and 14 are joined, poor joining hardly occurs.

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 golf club head by joining at least two divided pieces.

[0002]

2. Description of the Related Art As a conventional golf club head manufacturing method, a plurality of pieces constituting a golf head are separately manufactured by a casting method or a forging method, and the pieces are combined and integrally formed by welding or an adhesive. It is known to do. In addition to the production of golf club heads, a sintering method of compressing a metal powder to form a green compact and sintering the green compact under a predetermined temperature atmosphere to obtain a metal sintered body is well known. ing.

[0003]

When a golf club head is manufactured by manufacturing a plurality of pieces constituting a golf club head by using a sintering method and joining them together to form a golf club head, each piece is individually formed. To sinter
Bonding surface displacement due to the different shrinkage rates of the respective green compacts during sintering may occur when the sintered pieces are combined. For this reason, there is a problem that a manufacturing failure occurs due to a bonding failure of each piece. In view of the above, the invention described in claim 1 is to reduce product defects caused by defective bonding of each piece by causing each piece to contract at substantially the same shrinkage rate so as not to cause a displacement of a bonding surface during sintering. Is the purpose. In addition, the invention described in claim 2 has an object to suppress a change in posture of the green compact during sintering and a distortion due to the weight of the green compact in addition to the object of the invention described in claim 1. Is what you do. further,
According to a third aspect of the present invention, in addition to the objects of the first and second aspects of the present invention, the reaction force due to the weight is applied to the green compact substantially uniformly, and sintering is performed. The purpose is to make the green compact shrink almost evenly at times.

[0004]

The above-mentioned object is achieved by a method for manufacturing a golf club head having the following features. That is, according to the first aspect of the present invention, in a method of manufacturing a golf club head by joining at least two divided pieces, a metal powder is filled in a mold and pressed, and is substantially equal to the piece. Each of the pieces is obtained by forming a green compact having a shape, combining the green compact with the shape of a golf club head, and sintering them.

According to the present invention, since the green compact is combined with the shape of the golf club head, the bonding surfaces of the green compacts come into surface contact with each other, and are sintered in a state in which the sintering temperature distributions are substantially equal. For this reason, the shrinkage rates of the respective joining surfaces during sintering become almost equal, and it is difficult for poor joining to occur when the pieces are joined after sintering.

[0006] The invention described in claim 2 is the invention according to claim 1.
In the method for manufacturing a golf club head described in
Each piece is combined and placed so that the face surface side of the piece including the face surface is on the lower side in the direction of gravity, and the pieces are obtained by sintering them. According to the present invention, by using the face surface side as the mounting surface, even if shrinkage occurs during sintering, the posture is hardly changed, and stable shrinkage can be achieved. Further, since the so-called back face side has an inverted cup shape, sintering distortion due to its own weight can be suppressed.

[0007] The invention according to claim 3 provides the invention according to claim 1.
Alternatively, in the method for manufacturing a golf club head according to claim 2, each of the pieces is divided into at least a piece including a face surface and another piece with a hosel portion as a boundary, and the face surface side is Along with combining the green compacts so as to be on the lower side in the direction of gravity,
Each piece is obtained by filling and sintering a hosel portion in an aggregate layer of granules made of a material that does not easily react with the green compact. According to the present invention, the green compact located on the lower side receives a reaction force caused by its own weight or the weight of another green compact evenly from surrounding granules. Therefore, the green compact shrinks almost uniformly during sintering. Further, since the hosel portion is also supported by the granules, the hosel portion is prevented from being bent by its own weight.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method for manufacturing a golf club head according to an embodiment of the present invention will be described below with reference to FIG. Golf club head 12 according to the present embodiment
The hosel portions 13h, 14 are formed by a thin face side piece 13 having a concave portion and a back face side piece 14.
By joining at the position of h, it is manufactured hollow.

The face side piece 13 and the back face side piece 14 are manufactured according to the following procedure. First, a metal powder as a sintering material is filled in a first mold (not shown) composed of a mold and a rubber mold. By pressurizing with the cm ² , the face-side green compact 13 finally having a shape substantially equal to the face-side piece 13 is manufactured. Similarly, using the second molding die, the back face surface side green compact 14 having substantially the same shape as the back face surface side piece 14 is manufactured. Here, a mixture of a titanium powder and an aluminum vanadium powder is used as the metal powder.

The face-side green compact 13 and the back face-side green compact 14 thus manufactured are combined with the shape of the golf club head 12. That is, the bonding surface 13t of the face-side green compact 13 and the bonding surface 14t of the back face-side green compact 14 are matched. Then, as shown in FIG. 1, with the face-surface-side green compact 13 facing down, the collective layer of beads 19 provided in a sintering furnace (not shown) reaches the position of the hosel portion 13 h. Buried. Here, a ceramic sphere having a diameter of about 3 mm is used as the beads 19. That is, the beads 19 correspond to the granules of the present invention.

In this manner, the face-side green compact 13
When the back-face-side green compact 14 is set in the sintering furnace, the pressure in the sintering furnace is reduced to about 10 ⁻⁵ Torr, and the furnace temperature is maintained at 1300 K or more, and about 4 hours. The face-side green compact 13 and the back face-side green compact 14 are sintered. When the sintering of the face-side green compact 13 and the back-face-side green compact 14 is completed, the face-side piece 13 and the back face-side piece 1
4 is obtained.

The face side piece 13 and the back face side piece 14 manufactured as described above are
Brazing is performed at positions t and 14t, the surface is machined, and the surface is polished and then painted. Thus, the golf club head 12 is completed, and a shaft (not shown) is attached to the completed golf club head 12.
Is assembled to complete the golf club.

As described above, according to the golf club head manufacturing method according to the present embodiment, the face-side green compact 13 and the back face-side green compact 14 are combined with the shape of the golf club head 12 during sintering. I have. Further, the green compacts are stacked such that the face-side green compact 13 is on the lower side. Therefore, the posture is unlikely to change due to sintering shrinkage, and the back face side has an inverted cup shape, so that sintering distortion due to its own weight can be suppressed. That is, both compacts 13,1
4 are brought into surface contact with each other and sintered in a state in which the sintering temperature distributions are substantially equal, so that the shrinking conditions of the two joined surfaces 13t and 14t during sintering are substantially equal, and the pieces are sintered after sintering. 13 and 14 are joined to their joint surfaces 13t and 1
When joining at 4t, poor joining hardly occurs. Therefore, the number of defective products due to poor bonding is greatly reduced.

Further, since the face-side compact 13 is buried in the beads 19 almost to the position of the hosel portion 13h for sintering, the face-side compact 13 is reduced in its own weight and the weight of the back face-side compact 14. The resulting reaction force is evenly received from the surrounding beads 19. Therefore, the face-side green compact 13 shrinks substantially uniformly during sintering. Also,
Since the hosel portions 13h and 14h are also supported by the beads 19, they do not bend under their own weight. For this reason, product defects are less likely to occur. Here, according to the method of manufacturing a golf club head according to the present embodiment, both pieces 13, 1
4 can suppress the displacement between the joining surfaces 13t and 14t to 0.2 mm or less. In the present embodiment, an example in which the face-side green compact 13 is sintered in a state of being embedded in ceramic beads 19 has been described, but it is needless to say that ceramic powder can be used.

Although the embodiments of the present invention have been described above, it is to be understood that the embodiments of the present invention have the following technical matters in addition to the technical matters described in the claims. Please note. (1) The method for manufacturing a golf club head according to claim 1, wherein the green compact is buried in a powder of a material which does not react with the green compact to a position substantially at a hosel portion, and then sintered. Manufacturing method of a golf club head. Almost the same action and effect as in the case of granules can be obtained.

[0016]

According to the present invention, since the green compacts shrink at substantially the same shrinkage rate at the joint surface during sintering, defective joints are less likely to occur when pieces are joined after sintering, and product defects are reduced. Dramatically reduced.

[Brief description of the drawings]

FIG. 1 is a side view illustrating a sintering step of a method for manufacturing a golf club head according to one embodiment of the present invention.

[Explanation of symbols]

Reference Signs List 12 golf club head 13 face-side green compact, face-side piece 13h hosel part 13t bonding surface 14 back face-side green compact, back face surface side piece 14h hosel part 14t bonding surface 19 beads (particles)

Claims (3)

[Claims] 1. A method for manufacturing a golf club head by joining at least two divided pieces, wherein a metal powder is filled in a mold and pressurized to form a green compact having a shape substantially equal to the piece. Molding, combining the green compact with the shape of the golf club head,
A method of manufacturing a golf club head, wherein the pieces are obtained by sintering them. 2. The method for manufacturing a golf club head according to claim 1, wherein the pieces including the face are combined and placed so that the face side of the piece including the face side is lower in the direction of gravity, and the pieces are fired. A method of manufacturing a golf club head, wherein each of the pieces is obtained by tying. 3. The method for manufacturing a golf club head according to claim 1, wherein each piece is divided into at least a hosel portion as a boundary and a piece including a face surface and another piece. Combining each of the green compacts so that the face surface side is the lower side in the direction of gravity, and filling the hosel portion in the aggregate layer of granules made of a material that does not easily react with the green compact. A method for manufacturing a golf club head, wherein each of the pieces is obtained by performing sintering.