JP2605108B2 - Golf club head manufacturing method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for manufacturing a golf club head mainly composed of fiber reinforced plastics manufactured by compression molding.

[Conventional technology]

If a head of the size conventionally formed of persimmon or a head having a size larger than that is to be made using fiber reinforced plastics, the specific gravity of fiber reinforced plastics is about twice as large as that of persimmon. Urethane foam with a light specific gravity is molded in advance in a mold one size smaller than the head, and this is attached to the head mold or a fiber reinforced plastic is pasted around it, and this is attached to the head mold and heated. Press molding.

[Problem to be solved]

In golf club heads formed using conventional fiber-reinforced plastics, urethane foam with a low specific gravity,
Since the molding pressure during the heating and pressurizing molding of fiber reinforced plastics cannot be tolerated and collapse or deformation occurs due to compression, sufficient pressure is not applied to the fiber reinforced plastics because the required molding pressure cannot be obtained. In addition, the outer surface of the head is depressed, and minute cavities called pinholes are formed on the surface and inside, so that defective products are easily generated. In addition, since the deformation of urethane foam with a low specific gravity does not occur in a similar manner but deforms in a complicated manner, the layer of the fiber-reinforced plastics after molding becomes uneven, and the position of the center of gravity and the moment of inertia of the head are designed. In the worst case, or the like, there is a possibility that the face surface and the neck portion, which receive a large force at the time of hitting, may be damaged.

Therefore, the present invention does not reduce the molding pressure during molding of a golf club head mainly composed of fiber-reinforced plastics, and minimizes the pressure decrease. In addition, the present invention provides a method of manufacturing a golf club head which has a uniform thickness of fiber-reinforced plastics, exhibits sufficient strength and performance as designed, and is suitable for manufacturing an unprecedented large head. The purpose is to:

[Means for solving the problem]

In order to achieve the above-described object, the present invention provides a method of forming a foam material in a filling material forming cavity surrounded by a foaming core in close contact with an upper surface of an upper mold cavity inserted into an upper and lower mold for foaming and a lower mold. Injecting, foaming and curing to form a donut-shaped filler, and filling the core for the main body corresponding to the foaming core inserted from the lower mold into the space formed in the upper and lower pressing mold for the main body A step of setting the material, fitting it into the hole formed by the foaming core so that the upper surface of the core for the main body at the upper end of the hole stops, and setting the uncured fiber-reinforced synthetic material on the outer periphery of the filler. A step of applying a resin, tightening the upper and lower pressing molds for the main body, and then raising the core for the main body, pressurizing and heating the uncured fiber reinforced synthetic resin to mold the main body of the head, and a main body. Remove the core and open the upper and lower pressing mold for the main body. It is obtained by a process for producing Lumpur before installation of the golf club head.

[Action]

According to the present invention, a doughnut-shaped filler, in which the head is arranged around the main body, can be accurately molded by using a foaming core at the time of molding the filler, and the main body is pressed when pressurized by the upper / lower pressing mold for the main body. Since the filler is fitted into the core, a non-fiber reinforced plastic space equivalent to the conventional space can be formed with a much smaller volume of the filler than before, so that the volume of the filler that is deformed or broken by the molding pressure is reduced. As a result, a sufficient molding pressure can be applied, and as a result, it is possible to manufacture a club head capable of achieving a uniform thickness of the fiber reinforced plastics and exhibiting sufficient strength and performance as designed.

〔Example〕

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

1 to 3 show the foaming core 3 which is inserted into the upper and lower molds 1 and 2 for foaming and the lower mold 2 and is in close contact with the upper surface of the cavity 1A of the upper mold 1; Upper mold 1
Is defined by the cavity 1A and the foaming core 3 to form a cavity for forming a filler. A foaming material is injected into the filling material forming cavity and foam-hardened to form a donut-shaped filling material 4 as shown in FIG. Next, the foaming core 3 can be used as it is to form the main body core, but as shown in FIG. 5, the main body core having a size that can be inserted into the hole of the donut-shaped filler 4 molded as shown in FIG. 5
Into the core 3 for foaming and inserted into the hole of the filler 4,
An uncured fiber-reinforced synthetic resin 8 is attached to the filler 4 fitted in the core 5. As shown in FIG. 5, if the uncured fiber reinforced synthetic resin 8 is attached to the outer periphery of the filler 4,
The main body of the head is molded by tightening the upper and lower pressurizing dies 6 and 7 for the main body and heating and pressurizing. In the state shown in FIG.
The upper surface of the core is not inserted up to the upper end of the hole of the filler 4, but is inserted so that the upper surface of the core for the main body stops just before the upper end, and the upper and lower pressurizing dies 6 and 7 for the main body are tightened. 5 up,
As a result, the fiber-reinforced synthetic resin 8 in the dies 6 and 7 is pressurized from inside to form a fiber-reinforced plastic layer having a predetermined thickness. In this manner, when the uncured fiber reinforced synthetic resin 8 is pressed by the upper mold 6, the upper surface of the main body core 5 is also pressed from the inside, so that a sufficient pressing force is applied to the fiber reinforced synthetic resin 8. Can be given.
As means for raising the core 5 for the main body, the core 5 may be raised from the inside of the fiber-reinforced synthetic resin 8 by a cylinder (not shown) or the like. By raising and pressing the core 5 for the main body after the upper and lower molds are clamped in this way, the fiber-reinforced plastics is applied to the boundary between the upper and lower pressurizing dies 6 and 7 called a burr formed between the upper and lower pressing dies 6 and 7. The protrusion can be prevented, and the head can be molded with a more sufficient pressure. In addition, by configuring the main body core 5 to be movable up and down, it is easy to remove the mold and an effect of improving productivity can be expected. As shown in FIG. 6, after performing the heating and pressurizing for a predetermined time, the core 5 for the main body is extracted, and the upper and lower pressurizing dies 6 and 7 for the main body.
And the golf club head before the sole is attached is manufactured. A sole plate is attached to the sole portion of the head after the core 5 for the main body is removed. Further, low specific gravity urethane foam (preferably 0.3 or less) may be injected into the hole of the filler 4 for noise reduction at the time of hitting a ball.
FIG. 7 is a sectional view of the golf club head taken out of the golf club head taken out of the mold by being heated and pressurized by the vertical pressing molds 6 and 7 for the main body. It is molded on the main body 10 of the head.

As the filler 4, urethane or silica balloon which is obtained by injecting a predetermined amount of a mixture of polyol and isocyanate into the cavities 1A and 2A may be used, and a material having a low specific gravity is preferable. The foaming core 3 and the main body core 5
Is formed in a square shape, but may be similar to the shape of a plate, which is called a sole plate, provided on a club head sole portion, or may have various other shapes. In order to fix the sole plate to the sole portion of the main body 10, a shape such that a step portion or the like for mounting can be formed around the hole of the sole portion of the main body 10 after the core 5 for the main body is extracted. It is also possible to form the core 5 for the main body. Further, as the fibers used for the fiber-reinforced synthetic resin 8, various kinds of fibers, such as carbon fibers, glass, Kevlar, whiskers, and boron, can be used as long as they can be reinforced.

The shapes of the cores 3 and 5 shown in FIG. 8 indicate those whose side faces are formed in a tapered shape, and are formed so that the cores 3 and 5 can be easily pulled down.

The thing shown in FIG. 9 shows an auxiliary core 9 attached to the cores 3 and 5. By attaching the auxiliary core 9 to the cores 3 and 5, the space inside the head can be increased. The mounting position of the auxiliary core 9 may be all or a part of the core 3 or 5. FIG. 10 shows an example of a main body core 5 using an auxiliary core 9 as shown in FIG. 11 and 12 show the core 3 for foaming.
2 shows a case where the auxiliary core 9 is used on the face side of the above-described embodiment, and a case where the auxiliary core 9 is attached to all side surfaces of the foaming core 3. These auxiliary cores 9 can be removed from the cores 3 and 5. By using such an auxiliary core 9, a maximum air gap can be obtained inside the head, so that the head can be made larger.

〔effect〕

As described above, according to the present invention, since the foaming core is used when molding the donut-shaped filler, the volume of the filler compressed at the time of molding is reduced, and a decrease in the pressing force is suppressed. In addition, the weight of the head can be reduced by the space provided by the core, so that the degree of freedom in design increases. Also, when heating and pressurizing the fiber-reinforced synthetic resin, the core for the main body is fitted into the hole of the donut-shaped filler, so that the fiber-reinforced synthetic resin is sufficiently added using the vertical pressing mold for the main body. It is possible to pressurize, so that the thickness of the main body after molding is not uneven and the center of gravity of the head and the moment of inertia cannot be obtained as designed, and the molding pressure at the time of press molding with the press mold is reduced. Even if the filling material withstands and crushes or deforms, its influence can be suppressed to a small extent.
In addition, since sufficient pressure is applied, the outer surface of the head is not dented, and a minute cavity called a pinhole does not occur on the surface and inside. Further, since the maximum gap can be formed inside while leaving a predetermined thickness, the head itself can be made larger than before. The main body mold does not need to be divided as in the embodiment,
The face surface and the back surface may be divided and used to insert and press the core from the sole surface. The purpose is to insert a filler around the core, push the core in after mold clamping, and apply sufficient pressure.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a mold for forming a filler, FIG. 2 is a sectional view taken along the line II-II in FIG. 1, FIG. 3 is a sectional view taken along the line III-III in FIG. 5 is a plan view of the filled filler, FIG.
FIG. 6 is a cross-sectional view showing a state in which the filler shown in the figure is fitted into a core for a main body, and a fiber-reinforced synthetic resin is stuck around the filler, and FIG. FIG. 7 is a cross-sectional view of the head molded after pressing as viewed from the toe side, FIG. 8 is a cross-sectional view showing a modification of the foaming core or the main body core, and FIG. FIG. 10 is a cross-sectional view of a state in which the core is detachably attached to the foaming core or the main body core. FIG. 10 is a plan cross-sectional view of a head using the auxiliary core shown in FIG.
FIG. 11 and FIG. 12 are sectional views showing other examples of use of the auxiliary core. 1 ... upper mold, 2 ... lower mold, 1A, 2A ... cavity, 3 ...
... core for foaming, 4 ... filler, 5 ... core for body, 6 ...
... Upper press mold for main body, 7 ... Lower press mold for main body, 8 ...
Fiber reinforced synthetic resin.

Claims (1)

(57) [Claims] 1. A method of manufacturing a golf club head mainly composed of fiber reinforced plastics manufactured by compression molding, comprising: a foaming core in close contact with upper surfaces of cavities of upper and lower molds and an upper mold inserted into a lower mold. A process of injecting a foaming material into a cavity for forming a filling material surrounded by the above, and performing foaming and curing to form a donut-shaped filling material; The filler is set on the main body core corresponding to the foaming core, and the upper surface of the main body core stops in the hole formed by the foaming core just before the upper end of the hole. The step of fitting and setting, the step of attaching an uncured fiber reinforced synthetic resin to the outer periphery of the filler, the tightening of the upper and lower pressing mold for the main body, and then the raising of the core for the main body, the uncured fiber strength Pressurizing and heating the synthetic resin to form a head body, and removing the core for the body, opening the upper and lower pressing molds for the body, and manufacturing a golf club head before mounting the sole. A method for producing a golf club head.