JPH0329420B2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to fiber reinforced plastics (hereinafter referred to as
Regarding the method of molding the head of a wood golf club with an outer shell made of FRP (abbreviated as FRP) and metal, we have attempted to improve moldability and workability by devising a method for molding the outer shell that makes up the head body. This is what I did.

In general, this type of wood club has a head body made of wood such as persimmon or maple that is processed into the desired shape, a face plate made of ABS resin or the like on the hitting surface, and a sole or back made of brass, etc. It is well known that a ball is provided with a mass body such as a sole plate or a back weight to increase inertia and increase flight distance.

However, such conventional wood club heads have become expensive due to the rising cost of materials due to the difficulty in obtaining raw wood, and the advancement of processing technology due to the complexity of the shape. A decline was inevitable.

Therefore, in view of the drawbacks of the so-called wooden club heads mentioned above, as disclosed in Japanese Patent Publication No. 51-21436, an FRP outer shell structure in which the core of the head body is filled with foamed synthetic resin has been developed. A wood-type club head has been developed, but as is well known, there are various difficulties in its specific manufacture due to the complexity of the head shape, and at present it has not been put into practical use.

The purpose of this invention is to embody the manufacturing means of the prior art described above and make it practical, as well as to provide a new wood club head by combining it with metal. , on the surface of the metal core that makes up the inner shell of the head.
After coating the FRP molding material and placing it in the cavity of a mold made of split molds, the mold is clamped and hot pressed to create a composite outer shell layered structure consisting of an inner shell made of metal and an outer shell made of FRP. It is characterized by:

The present invention will be explained below based on illustrated embodiments.

1 to 6 show an embodiment of the means for manufacturing a wood-type club head for golf according to the present invention. As shown in FIGS. 1 and 2, 1 in the drawings indicates a hollow head body. It is. The head body 1
has a composite outer shell layer structure of an outer shell layer 2 made of FRP and an inner shell layer 3 made of a light metal alloy metal material, and a club shaft 4 is attached to the neck base 1a.
is inserted and fixed by penetrating the tip portion 4a to the sole surface side FRP outer shell layer 2, and the striking surface 1
b includes a face plate 5 made of ABS resin or hardened FRP, a sole surface 1c, and a back surface 1d;
includes a sole plate 6 made of a metal plate such as brass,
Mass bodies such as the back weight member 7 and the back weight member 7 are arranged and fixed by manufacturing means described later.
In addition, 8 in the figure is the neck base 1a of the head main body 1.
A stopper 9 closes the opening on the insertion end side of the club shaft 4 which is inserted and fixed therein, and a protector 9 protects the periphery of the neck base 1a of the head body.

That is, in order to manufacture the above-mentioned wood club head, as shown in FIGS. 3 to 6, a rod-shaped jig 10 (in the illustrated embodiment, the club shaft itself is a rod-shaped jig) forming the club shaft shaft portion is used. (In this case, the protector 9 is inserted and fixed in advance to the portion corresponding to the base of the head of the clubshaft), and a hollow separately formed in the shape of the core that constitutes the inner shell of the head body metal core 11
is supported and fixed in a state in which the tip end of the rod-shaped jig tip 10a completely penetrates and protrudes toward the sole surface side. Next, for example, a prepreg is attached or affixed to the surface of the metal core 11, or a reinforcing fiber impregnated with an uncured liquid synthetic resin is wound by a filament winding method.
After coating with the FRP molding material 12 (see Fig. 3), a cavity 16 having the outer peripheral shape of the head of a mold 15 consisting of a pair of left and right split molds 13 and 14 is formed.
(In this case, although not shown, the mold surface is coated with a gel coat layer together with a mold release agent in advance). After positioning and fixing by the clamping action of the protector mounting base, hot press molding is performed (see Figures 4 and 5). And after demolding,
By cutting off the tip end 10a of the rod-shaped jig (club shaft) protruding toward the sole surface of the head body 1 (see FIG. 6) and sealing its open end, the club shaft shown in FIGS. This results in a wood club head as shown in the figure.

By the way, the reinforcing fibers of the FRP molding material are composed of a suitable combination of carbon fiber, glass fiber, or Kevlar, or a single use of carbon fiber or glass fiber. By inserting reinforcing members such as plates and back weight mass bodies in appropriate positions, it is possible to integrate the entire head body at the same time as hot-press molding the head body. Further, during hot pressurization, liquid may be injected at high pressure into the hollow portion of the metal core to apply pressure from the core side, thereby reliably preventing deformation of the metal core. Furthermore, when perforating the metal core to adjust the overall weight or center of gravity, the core member is formed separately and the perforated metal core is coated on its surface by an appropriate means, and the core member is foamed. If it is plastic, it may be left as is, while if it is a material that can be eluted, such as a low-melting metal, it may be discharged to the outside after release from the mold to make it hollow.

As explained above, the present invention involves coating the surface of a hollow metal core that makes up the inner shell of the head with an FRP molding material that makes up the outer shell of the head, and placing it in the cavity of a mold having the outer peripheral shape of the head. By pressing, a head body made of a composite outer shell of FRP and metal is obtained. This makes it possible to easily form complex wood club heads, and also allows the metal core that makes up the inner shell of the head to be easily molded. Since it serves as an inner mold, the finish is good, and it also has excellent practical effects, such as improving productivity and mass production and reducing costs.

[Brief explanation of drawings]

FIG. 1 is an explanatory view showing one embodiment of a wood club head for golf according to the present invention, FIG. 2 is an enlarged sectional view of the same, and FIGS. 3 to 6 are explanatory views showing the manufacturing state. 1...Head body, 2...FRP outer shell layer, 3...
...Metal inner shell layer, 11...Metal core, 12...
FRP molding material, 13, 14, 15... mold,
16... Cavity.

Claims (1)

[Claims] 1. On the surface of the metal core constituting the inner shell of the head.
A method for molding a wood club head for golf, which is characterized in that the FRP molding material is coated and placed in the cavity of a mold made of split molds, and then the mold is clamped and hot-pressed. 2. A method for molding a wood club head for golf according to claim 1, characterized in that prepreg is used as the FRP molding material. 3. A method for molding a wood club head for golf according to claim 1, characterized in that reinforcing fibers impregnated with an uncured liquid synthetic resin are used as the FRP molding material.