JPH01310675A - Manufacture for golf club head - Google Patents

Abstract

PURPOSE:To decrease the volume of a charging material, which is compressed at the time of molding, to suppress the lowering of pressurizing force, to reduce the weight of a head and to increase the freedom degree of design by using a core for foaming when the doughnut-shaped charging material is molded. CONSTITUTION:A foaming material is injected into a cavity 2A of a lower mold 2, a cavity 1A of an upper mold 1 and further, a cavity for charging material molding to be composed of a for forming. Then, the foaming material foams and sets and a doughnut-shaped changing material 4 is molded. Next, a 5 for main body of a size, which can be inserted to the hole of the doughnut- shaped charging material, is inserted to the hole of the charging material 4 instead of the core 3 for forming and unset fiber strengthening synthetic resin 8 is attached to the charging material 4 which is fit into this core 5. Next, upper and lower pressurizing metallic molds 6 and 7 for main body are fastened, heated and pressurized and the main body is molded. Then, the core 5 for main body is put off and the upper and lower pressurizing metallic molds 6 and 7 are opened. After that, a sole plate is fit to the sole part of the head after the core 5 for main body is put off.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for manufacturing a golf club head mainly made of fiber-reinforced plastics manufactured by compression molding.

[Conventional technology]

If you try to use fiber-reinforced plastics to make a head that is the same size or larger than that conventionally made with Hershimon, the specific gravity of fiber-reinforced plastics is about twice that of Vershimon, so the internal Molded urethane foam, etc., which has a light specific gravity, in a mold that is one size smaller than the head, then attaches it to the head mold, or attaches fiber-reinforced plastic around it, and then attaches it to the head mold and heats it. It was pressure molded.

[Problem to be solved]

In conventional golf club heads formed using fiber-reinforced plastics, materials such as foamed polyurethane, which have a light specific gravity, cannot withstand the molding pressure of fiber-reinforced plastics during heating and pressure molding, resulting in collapse or deformation due to compression. As a result, the necessary molding pressure cannot be obtained and sufficient pressure is not applied to the fiber-reinforced plastic, causing the outer surface of the head to be dented and micro cavities called pinholes to occur on the surface and inside, resulting in defective products. This was likely to occur. Furthermore, the deformation of urethane foam, which has a light specific gravity, does not deform in a similar manner, but in a complex manner, resulting in uneven thickness of the fiber-reinforced plastic layer after molding, and the position of the center of gravity and moment of inertia of the head. If the design is not achieved, or in the worst case scenario, there is a risk that the face and neck portions, which are subjected to large forces upon impact, may be damaged.

Therefore, the present invention aims to prevent voids on the surface and inside of the club head after molding without reducing the molding pressure and minimizing the pressure drop when molding a golf club head mainly made of fiber-reinforced plastic, 7X. Furthermore, the thickness of the fiber-reinforced plastic is made uniform, and the golf club head is manufactured to have sufficient strength and performance as designed, and is suitable for manufacturing a larger head than ever before. The purpose is to provide a method.

[Means to solve the problem]

In order to achieve the above object, the present invention injects a foaming material into a cavity for forming a filling material surrounded by an upper and lower mold for foaming and a foaming core inserted into the lower mold and in close contact with the upper surface of the cavity of the upper mold. The filling material is formed into a donut-shaped filling material by foaming and hardening, and the filling material is set in the main body core inserted from the lower mold into the space formed in the upper and lower pressurized molds for the main body. The process of pasting uncured fiber-reinforced synthetic resin on the outer periphery of the main body, the process of tightening the upper and lower pressure molds for the main body by heating and pressurizing them to form the main body of the head, and the process of removing the core for the main body and forming the upper and lower press molds for the main body. The method includes a step of opening a pressure mold and manufacturing a golf club head before attaching the sole.

[Effect]

In this invention, when molding the filler, a foaming core is used to accurately mold the donut-shaped filler that is placed around the main body using the head, and when pressurizing with the upper and lower pressure molds for the main body, the main body Because the filler is fitted into the core, a non-fiber-reinforced plastic space equivalent to the conventional one can be formed with a much smaller volume of filler than before, and therefore less filler volume is deformed or destroyed by molding pressure. ,
Sufficient molding pressure can be applied, and as a result, the thickness of the fiber-reinforced plastics can be made uniform, making it possible to manufacture club heads that exhibit sufficient strength and performance as designed.

〔Example〕

Preferred embodiments of the present invention will be described below with reference to the drawings.

1 to 3 show the foaming core 3 inserted into the upper and lower foaming molds 1.2 and the lower mold 2 and in close contact with the upper surface of the cavity 1A of the upper mold 1, and The cavity IA of the upper mold 1 and the foaming core 3 define a cavity for forming a filler material. A foaming material is injected into the filling material forming cavity and is foamed and hardened to form a doughnut-shaped filling material 4 as shown in FIG.

Next, although the foaming core 3 can be used as it is to make the main body core, the main body core is of a size that can be inserted into the hole of the molded donut-shaped filler material 4 as shown in FIG. 5 is replaced with a foaming core 3 and inserted into the hole of a filler 4, and an uncured fiber-reinforced synthetic resin 8 is attached to the filler 4 fitted into the core 5. As shown in Fig. 5, once the uncured fiber-reinforced synthetic resin 8 is pasted on the outer periphery of the filler 4, the upper and lower press molds 6 and 7 for the main body are tightened and heated and pressurized to form the main body of the head. do. In the state shown in FIG. 5, the upper surface of the main body core 5 is not inserted to the upper surface of the hole of the filler 4, and the main body core 5 is raised immediately after tightening the upper and lower press molds 6.7 for the main body. , to form a fiber-reinforced plastic layer of a predetermined thickness. By doing this, when the uncured fiber-reinforced synthetic resin 8 is pressurized by the upper mold 6, if the upper surface of the main body core 5 is also pressurized from the inside, sufficient pressure is applied to the fiber-reinforced synthetic resin 8. can be given.

The main body core 5 may be raised by applying pressure from inside the fiber-reinforced synthetic resin 8 using a cylinder or the like (not shown). By raising the core 5 for the main body after the upper and lower molds are tightened and pressurizing it, fiber reinforcement is applied to the split mold boundary surface called a pari formed between the upper and lower pressing molds 6 and 7 for the main body. This prevents the plastic from extruding and allows the head to be molded with more sufficient pressure.

Moreover, by configuring the main body core 5 to be movable up and down, demolding becomes easy and productivity can be expected to be improved.

As shown in FIG. 6, after heating and pressurizing for a predetermined period of time, the main body core 5 is removed and the upper and lower main body press molds 6.7 are opened to attach the sole to the previous golf club head. The Rukoto. A sole plate is attached to the sole portion of the head after removing the core 5 for the main body. In addition, filler 4
Low specific gravity foamed urethane (preferably 0.3 or less) may be injected into the hole in order to muffle noise when hitting the ball. 7th
The figure shows a cross-sectional view from the toe side of a golf club head that has been heated and pressurized with the upper and lower pressing molds 6.7 for the main body and taken out from the mold. It is molded into the main body 10.

The filler 4 may be urethane foamed by injecting a predetermined amount of a mixed solution of polyol and isocyanate into the cavities IA, 2A, or a silica balloon, and one with a low specific gravity is preferable. Further, although the cross-sectional shape of the foaming core 3 and the main body core 5 is formed into a rectangular shape, the cross-sectional shape may be similar to the shape of a plate disposed in the sole portion of the club head called a sole plate, or may have various other shapes. The following can be adopted. In addition, in order to fix the sole plate to the sole portion of the main body 10, the shape is such that a stepped portion or the like for attachment can be formed around the hole in the sole portion of the main body 10 after the main body core 5 is removed. It is also possible to form the core 5 for the main body. Furthermore, various fibers can be used for the fiber-reinforced synthetic resin 8 as long as they can strengthen plastics, such as carbon fiber, glass, Kevlar, whiskers, and boron.

The shape of the core 3.5 shown in FIG. 8 is such that the side surface is formed into a tapered shape, and the core 3.5 is formed so that it can be easily pulled out downward.

The one shown in FIG. 9 shows an auxiliary core 9 attached to the core 3.5. By attaching this auxiliary core 9 to the core 3.5, the space inside the head can be increased. The auxiliary core 9 may be attached to the entire side surface of the core 3 or 5 or to a part thereof. What is shown in FIG. 10 is an example of the main body core 5 using the auxiliary core 9 as shown in FIG. Figures 11 and 12 show one in which the auxiliary core 9 is used on the face side of the foaming core 3, and one in which the auxiliary core 9 is attached to all sides of the foaming core 3. . These auxiliary cores 9 can be removed from the core 3.5. By using such an auxiliary core 9, it is possible to obtain maximum air space inside the head, which makes it possible to make the head larger.

〔effect〕

As explained above, according to the present invention, since a foaming core is used when molding a donut-shaped filler, the volume of the filler compressed during molding is reduced, and a drop in pressing force is suppressed. At the same time, the weight of the head can be reduced by the space provided by the core, increasing the degree of freedom in design. In addition, when heating and pressurizing the fiber-reinforced synthetic resin, the core for the main body will be fitted into the hole of the donut-shaped filler, so the fiber-reinforced synthetic resin should be sufficiently applied using the upper and lower pressing molds for the main body. This eliminates the inconveniences such as uneven thickness of the main body after molding and inability to obtain the center of gravity position and moment of inertia of the head as designed, and reduces the molding pressure during pressure molding with a pressure mold. The filler is resistant, and even if it collapses or deforms, the effects can be kept to a minimum. Further, since sufficient pressure is applied, the outer surface of the head is not dented, and minute cavities called pinholes are not formed on the surface or inside the head. Furthermore, since the maximum void can be formed inside while leaving a predetermined wall thickness, the head itself can be made larger than before. The main body mold does not need to be divided as in the embodiment, but the face surface and the back surface may be divided into molds, and the core may be inserted and pressurized from the sole surface. The idea is to fit the filler material around the core and push the core in after mold clamping, as long as sufficient pressure can be applied.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view showing the mold for forming the filler, Figure 2 is a cross-sectional view taken along line nn in Figure 1, Figure 3 is a cross-sectional view taken along line m-m in Figure 2, and Figure 4 is a cross-sectional view taken along line m-m in Figure 2. Fig. 5 is a plan view of the filler shown in Fig. 4, and Fig. 5 is a sectional view showing the state in which the filler shown in Fig. 4 is fitted into the core for the main body and a fiber-reinforced synthetic resin is pasted around the filler.
The figure is a cross-sectional view showing the state of pressurization with the upper and lower pressurizing molds for the main body.
Figure 7 is a cross-sectional view of the head molded after processing as seen from the toe side, Figure 8 is a front view showing a modified example of the foaming core or main body core, and Figure 9 is the auxiliary core used for foaming. A cross-sectional view of the core or the main body core removably attached, Figure 10 is a plan cross-sectional view of the head using the auxiliary core shown in Figure 9, and Figures 11 and 12 are the auxiliary cores. It is sectional drawing which shows the other usage example, respectively. 1... Upper mold, 2... Lower mold, LA, 2A... Cavity, 3... Core for foaming, 4... Filler, 5... Core for main body, 6...・Top pressure mold for main body, 7...Top pressure mold for main body, 8...Fiber-reinforced synthetic resin. Applicant Brideston Co., Ltd. Agent Patent Attorney Masu 1) Takeo

Claims (1)

[Scope of Claims] 1. In a method for manufacturing a golf club head mainly made of fiber-reinforced plastics manufactured by compression molding, the foaming material is inserted into the upper and lower molds and the lower mold and comes into close contact with the upper surface of the cavity of the upper mold. The process involves injecting foaming material into a filling material forming cavity surrounded by a core and foaming and hardening it to form a donut-shaped filling material. A process of setting the filler material in the inserted core for the main body and pasting uncured fiber-reinforced synthetic resin around the outer periphery of the filler, and tightening the upper and lower press molds for the main body and applying heat and pressure to form the main body of the head. 1. A method for manufacturing a golf club head, comprising: a step of molding a main body core, and a step of manufacturing a golf club head before sole attachment by removing a main body core and opening upper and lower press molds for the main body.