JPH1147325A - Production of golf club head - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily produce a golf club head having a large weight and a wide sweet spot at a high yield. SOLUTION: A putter head is formed by a molding of a thermosetting resin, hardener and filler and weights 3 embedded therein. The weights 3 are formed of columnar bodies made of brass and are arranged in nearly the intermediate positions of the molding 2 by directing the axial lines in the direction orthogonal with the club-face. The process for producing the putter head 1 includes a stage for first producing a kneaded mixture 4 by kneading the liquid thermosetting resin, the hardener and the powdery filler, a stage for pouring this kneaded mixture 4 into a mold 5, a stage for hanging the weights 3 by means of fine wires 6 from above and sinking the weights into the prescribed positions in the kneaded mixture 4, a stage for curing the thermosetting resin and a stage for cutting and removing the fine wires 6 hanging the weights 3 after solidification.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a golf club head having a large sweet spot and a large weight.

[0002]

2. Description of the Related Art Conventionally, golf club heads include brass,
Some are made of metal such as stainless steel, Be-Cu, and aluminum alloy. Further, there is a type in which a filler and a liquid thermosetting resin are put into a mold and cured, and then a weight is fitted and fixed. The weight is attached by drilling a hole in the cured molded body, injecting an adhesive into the hole, fitting the weight into the hole, and bonding. The perforated surface is polished and finished.

[0003]

The former golf club head described above has a narrow sweet spot, and it is difficult to hit a desired distance or direction if the hit point deviates from the sweet spot. . In the latter case, since the weight is fitted in the back, the manufacturing process becomes complicated, scratches and the like are liable to occur, and the yield is reduced. Accordingly, it is an object of the present invention to provide a method for easily manufacturing a golf club head having a wide sweet spot at a high yield.

[0004]

In the present invention, in order to solve the above-mentioned problems, a step of kneading a powdery filler, a liquid thermosetting resin and a hardening agent to form a kneaded material 4 is performed. A step of pouring the kneaded material 4 into the mold 5, a step of suspending the metal weight 3 with a thin wire and submerging it at a predetermined position in the kneaded material 4 in the mold 5, a step of solidifying the kneaded material 4, A step of cutting the fine wire after the kneaded material 4 is solidified.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a putter head will be described. In the present embodiment, as shown in FIG. 1, a mallet-type putter head 1 is formed of a molded body 2 of a thermosetting resin, a curing agent, and a filler, and a weight 3 embedded in the molded body. The weight 3 is a cylindrical body made of brass, and is arranged in a substantially middle portion on the face side in parallel with a direction orthogonal to the face surface.

As shown in FIGS. 2 to 4, the putter head 1 first kneads a liquid thermosetting resin and a curing agent with a powdery filler, and opens the kneaded material 4 at the top. The mixture is poured into a silicone rubber mold 5, and the two weights 3 are suspended from above by a thin wire 6 made of synthetic resin and submerged at a predetermined position in the kneaded material 4. When the thermosetting resin is cured, the molded body 2 is taken out of the mold 5 and the outer portion of the thin wire 6 on which the weight 3 is suspended is cut off. An epoxy compound resin is used as the thermosetting resin. As the curing agent, for example, one based on a cyclic modified diamine or aliphatic modified amine and an acid anhydride is used. The amount of the filler is 1.5 to 3.0 times the total amount of the curing agent. This is because when the amount of the filler is less than 1.5 times, the curing agent before curing is in a liquid state, so that the filler is likely to settle, and a molded article having a partially different density of the filler is obtained. Because you can. On the other hand, if the ratio is more than 3.0 times, the viscosity of the kneaded product of the curing agent and the filler becomes too high, and the molded product tends to contain bubbles. For this filler, zirconium silicate is used. For the fine wire 6, a nylon thread having a diameter of 0.165 mm is used. When the molded body 2 cures, it may shrink and cause a slight depression on the exposed surface.
In this case, the exposed surface is polished to finish the face surface.

FIG. 5 shows a putter head according to another embodiment. The putter head 7 is also a mallet type, but the weight 9 in the molded body 8 is a single cylindrical body made of brass, and is disposed substantially at the center with its axis oriented in a direction perpendicular to the face of the head. ing. The putter head 7 is also manufactured in the same manner as in the previous embodiment.

[0008] Table 1 shows test results in which the rolling distance of the hit ball by the putter heads 1 and 7 in each embodiment was compared with that of a conventional putter head made of brass. In this test, as shown in FIG.
Is measured on a felt S, which is fixed to a shaft S having a length of 890 mm, swung up 200 mm rearward, dropped naturally, and rolled on a felt-like mat M when hitting a ball B. The hitting position of the putter head is, as shown in FIG. 5, a point T shifted 15 mm left and right from the center point C0.
0 and H0, and points T1, T2, C1, C2, H1, and H2 whose positions are shifted vertically by 3 mm from these points. Each point was measured 5 times, and the average of these measured values is shown in Table 1.
Table 2 shows the ratio when the rolling distance at the center point C0 of brass is 1. In Table 2, the distance obtained by subtracting the shortest rolling distance from the longest rolling distance of each putter head is represented by max-min.

[Table 1]

[Table 2] As a result, the rolling distance was in the order of putter head 7> putter head 1> brass at each site. That is, it can be seen that the putter head according to the present invention is superior to brass in repulsion except for a part. Also, max-
The value of min is brass> putter head 1> putter head 7
>. By the way, the value of max-min indicates the degree of change of the repulsion force due to the change of the hitting position, and the smaller this value is, the smaller the change of the repulsion force is, and the sweet spot is wider. In other words, the size of the sweet spot is
Putter head 7> Putter head 1> Brass. Therefore, both putter heads 1 and 7 have a large repulsive force due to the weights 3 and 9 and have a wide sweet spot. Therefore, it is easy to hit the ball and control is easy. further,
Since it does not require cutting and finishing processes as in the past, it can be manufactured easily, has a smooth surface and is hardly damaged, and the weight and the filler are in close contact with each other. The weight is
The shape may be any shape such as a cylinder, a rectangular parallelepiped,
In addition, it may be single or plural.

[0009]

As described above, according to the present invention, the process of kneading the powdery filler, the liquid thermosetting resin, and the curing agent to form the kneaded material 4 is performed. And a step of suspending the metal weight 3 with a thin wire and submerging it at a predetermined position in the kneaded material 4 in the mold 5.
And a step of cutting the thin wire 6 after the kneaded material 4 has been solidified, so that the weight can be increased, it can be easily manufactured, and scratches and the like are less likely to occur, and the surface finish is reduced. Also, the present invention has an effect that the yield can be improved and the golf club head can be provided at low cost.

[Brief description of the drawings]

FIG. 1 is a perspective view of a golf club head manufactured by a method according to the present invention.

FIG. 2 is a perspective view of a mold in a process of manufacturing a golf club head according to the present invention.

FIG. 3 is a longitudinal sectional view of a mold in a process of manufacturing a golf club head.

FIG. 4 is a perspective view of a golf club head taken out of a mold.

FIG. 5 is a perspective view of another golf club head manufactured by the method according to the present invention.

FIG. 6 is a front view of a rolling distance measuring device.

FIG. 7 is a front view of the putter head.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 putter head 2 molded body 3 weight 4 kneaded material 5 mold 6 fine wire 7 putter head 8 molded body 9 weight

Claims (1)

[Claims] 1. A step of kneading a powdery filler, a liquid thermosetting resin and a curing agent to form a kneaded material, a step of pouring the kneaded material into a mold, and a step of thinning a metal weight. A process of hanging with a wire and submerging at a predetermined position in the kneaded material in this mold,
A method for manufacturing a golf club head, comprising: a step of solidifying a kneaded material; and a step of cutting a thin wire after the kneaded material is solidified.