JPS5928979A - Production of golf club - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a golf club, and more specifically to a method for manufacturing a wood club having a head made of a miscellaneous reinforced resin.

Traditionally, wood club heads have traditionally been made from a single piece of lightweight and relatively strong persimmon wood, but as the number of golfers has increased and the demand for clubs has rapidly increased, Due to problems such as difficulty in obtaining materials and molding costs, heads made of hard synthetic resin and cast heads made of steel have come to be provided. However, these have a higher specific gravity than Persimmon, so in order to make them as large as conventional heads, it is necessary to reduce the wall thickness and make the inside hollow. There is a risk that the strength of the mounting part may be insufficient.

Therefore, with the steel head, which has a much higher specific gravity than Persimmon, we gave up on making it as big as the conventional wooden head, and instead created a shape that is about two or so turns smaller and increased the wall thickness accordingly. Although it corresponds to
Currently, various attempts are being made to approximate the shape of the wooden head 2- as much as possible.

On the other hand, synthetic resin heads are reinforced [
This head made of fiber-reinforced resin was proposed, for example, in Japanese Patent Publication No. 51-21436 and Japanese Patent Application Laid-open No. 52-4.
The manufacturing method was disclosed in 913 January.

However, since the reinforcing fibers shown in these are all short lengths of 1 m 111 f made of glass or carbon graphite, the reinforcing effect cannot be said to be sufficient, and there is still a risk that the head may crack or become missing. Therefore, research has been conducted to use long mm for reinforcement mN, but in this case, it is difficult to mold the head into a predetermined shape, which is difficult and time-consuming. A simple molding method has been long awaited.

The present invention was made in view of the above-mentioned circumstances, and its purpose is to provide long fibers as reinforcing fibers. The object of the present invention is to provide a method for easily manufacturing a golf club having a synthetic resin head that is lightweight and has sufficient strength by using IN.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In order to manufacture a golf club by the method according to the present invention, first, a head shape material 1 which is sufficiently small in size to resemble the shape of the head is made of a material that is solid at room temperature and has a relatively low melting point. One end 2a of a metal pipe 2 having an inner diameter equal to the outer diameter of a shaft to be described later is inserted into the heel side of this molded material 1, and the other end 2b is slightly protruded. 3 is a thin rubber seal coated on the surface of the mold material 1. Through the rubber seal, a pre-braided reinforcing length IN impregnated with a thermosetting resin such as epoxy resin is inserted at room temperature. 1 is wound around the mold material 1, thereby forming the head outer shell portion 4. Glass fiber eave t, carbon graphite 1~fiber, etc. are used as this reinforcement am, and carbon graphite 1~1iff is preferably used. The method is to use multiple layers of plain-woven carbon cloth, and in areas where particularly high strength is required, such as the ball-hitting surface and the neck part of the shirt, it is more It is preferable to laminate a large number of cloths.

After the outer shell 4 is thus formed, the mold material 1 and the pipe 2 are placed in a split mold 5 having four parts corresponding to the outer shape of the head, and the split mold is closed. At this time, it is necessary to project the other end 2b of the pipe 2 to the outside of the split mold 5. Next, heat is applied to the split mold 5 to melt the mold material 1 made of a material with a relatively low melting point, and the heating temperature at this time should be as low as possible. When the mold material 1 melts, it is immediately discharged from the pipe 2 to the outside using an L-bump (not shown) or the like.
As shown in the figure, a hollow part 6 is formed inside the outer shell part 4.

After that, before the outer shell part 4 impregnated with the thermosetting resin is completely hardened, when compressed gas such as air is injected into the hollow part 6 from the other end 2b of the pipe 2, the outer shell part 4 is heated by the air pressure. The portion 4 is pressed against the inner wall of the split mold 5 from inside through the rubber seal 3, and a predetermined head shape is thus formed.

Note that the inside of the outer shell portion 4 is covered with a rubber seal 3-11.
- Because the gas injected into the hollow part 6 is
Therefore, a uniform and sufficient pressure is applied to the outer shell.

After that, a predetermined amount of foam is passed through the pipe 2 into the hollow part 6.
The foam may be injected into the shell portion 4 and foamed and hardened to form the core material 7 and fill the hollow portion, and the foam may be injected either after the outer shell portion 4 is hardened or before it is completely hardened. In the former case, when the foam is completely cured, and in the latter case, when the foam and the outer shell 4 are completely cured, a head 8 made of Ili miscellaneous reinforced resin having a predetermined shape and having a core material 7 inside. After this is completed and taken out from the split mold 5, the shaft 1/ft 9 is inserted into the pipe 2 from the other end 2b, thereby completing a golf club as shown in FIG. 4.

In addition, when the core material 7 is formed from a foam as in this embodiment, it is preferable to use foamable rigid polyurethane.

In the golf club manufactured in this manner, the outer shell portion 4 of the head is reinforced with long fibers, so sufficient strength can be obtained even if the outer shell portion is made thin. It is possible to easily obtain a synthetic resin head with an eave m and the same size as a conventional wooden head. Especially the reinforcement l! If carbon graphite long MAR with high specific strength is used as navy blue, if the size and weight of the head 8 are made the same as a wooden head, it will be extremely sturdy; This makes it possible to increase the size or increase the eaves.

Furthermore, Carbon Graph Eye 1- has many excellent features such as a high coefficient of restitution on the face surface and the ability to extend the flight distance of the ball.

In the present invention, as described above, the outer shell portion 4 is formed by covering the periphery of the mold material 1 with the reinforcement 1jAH made of long fiber carbon graphite impregnated with a thermosetting resin. The work is carried out outside the split mold 5, and at this stage there is no need for the outer shell 4 to have a strictly predetermined shape, so the work efficiency is very high. Then, after putting these into the split mold 5 and melting the mold material 1 and discharging it, compressed gas is injected into the hollow part 6, and the gas causes the outer shell part 4 to be attached to the inner wall of the split mold 5 through the rubber sheet 3. Since the outer shell is pressed evenly and thereby molded into a predetermined shape, the head 8 can always have an accurate shape. Further, by subsequently injecting foam or the like into the hollow portion 6 through the pipe 2, the core material 7 can be easily molded.

Moreover, since the pipe 2 used for forming the head is used as it is as the receiving hole for the shirt]-〇, the split mold 4 does not need any structure for this purpose, and it is not only simple, but also easy to use for the shaft. After inserting 9, this mounting part will become pipe 2.
It also has the effect of increasing its strength even further because it has a dual structure.

As described above, according to the method for manufacturing a golf club according to the present invention, the heel of the head member is made of a material with a relatively low melting point! One end of the pipe is inserted into 11, the periphery of the mold material is covered with a braided reinforcing fiber impregnated with thermosetting resin via a sealing layer to form an outer shell, and these are placed in a split mold having four head-shaped parts. and causing the other end of the pipe to protrude to the outside of the split mold, then heating the mold material to melt it and discharging it from the pipe to the outside to form a hollow part inside the outer shell part, Before the outer shell part is completely hardened, compressed gas is injected into the hollow part from the other end of the pipe, thereby pressing the outer shell part into a split mold and molding it into a predetermined shape, and then Since we decided to insert the shaft into the pipe after filling the hollow part with the core material, it was possible to easily and accurately mold the head made of synthetic resin reinforced with long fibers, and the head formed in this way Because it has high strength, there is a high degree of freedom in designing the outer shell by reducing its thickness and increasing its external shape, especially when carbon graphite long fibers are used as reinforcement IIN. Excellent strength and repulsion properties can also be obtained. In addition, the pipe used to form the head can be used directly as the shaft V-lift mounting hole, simplifying the process, and the double-structured mounting part is even stronger, significantly reducing the risk of breakage. It is.

[Brief explanation of drawings]

1 to 3 are explanatory diagrams of a method for manufacturing a golf club according to an embodiment of the present invention, in which FIG. 1 shows the state before inserting the mold material etc. into the split mold, and FIG. FIG. 3 is a cross-sectional view showing the state in which the molten mold material is discharged after being placed in the mold, and the state in which the outer shell is molded by air pressure, and FIG. 4 shows a golf club manufactured by this method. FIG. 1・・・・・・・・・・・・・・・Mold material 2・・・・・・
......Pipe 2 a, 2 b...
・Pipe end 3...Seal layer 4...Outer shell 5...
・・・・・・・・・・・・Split mold 6・・・・・・・・・・・・
・・・・・・Hollow part 7・・・・・・・・・・・・・・・Core material 9・・・・・・・・・・・・・・・Shaft Fig. 1 O Fig. 2 Fig. 3 figure

Claims (1)

[Claims] One end of the pipe is inserted into the heel side of a head shape material made of a material with a relatively low melting point, and the outer shell is covered with braided reinforcement 1IiN impregnated with a thermosetting resin through a sealing layer. None, when these are placed in a split mold having a head-shaped recess, the other end of the pipe is made to protrude outside the split mold, and then the mold is heated and melted to remove it from the pipe. A hollow part is formed inside the outer shell by discharging the gas to the outside, and compressed gas is injected into the hollow part from the other end of the pipe before the outer shell is completely hardened. A method of manufacturing a golf club, comprising: pressing the outer shell against the split mold to form a predetermined shape, filling the hollow portion with a core material, and inserting the shaft into the pipe.