JPS592768A - Molding of wood club head for golf - 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 molding a head of a golf wood club having an outer shell made of fiber reinforced glasstics (hereinafter abbreviated as FRP) and metal, and relates to a method for molding a head of a golf wood club having an outer shell made of fiber reinforced glasstics (hereinafter abbreviated as FRP) and metal. By devising the molding means, the moldability and workability are improved.

In general, this divine wood club usually has a head body.
By processing into the desired shape with irrigation materials such as persimmon trees and maple, and by providing a face plate made of ABS resin or the like on the hitting surface, and a mass body such as a run plate or back weight made of brass or the like on the sole or back surface. It is well known that the ball has increased inertia and flight distance.

However, such conventional wood club heads have become expensive due to the soaring cost of materials due to the difficulty in obtaining raw wood, and the sophistication of processing technology due to the complexity of the shape.
Contrary to the increase in the number of golfers, the quality has inevitably declined.

Therefore, in view of the drawbacks of the so-called wooden club heads mentioned above, as disclosed in Japanese Patent Publication No. 51-21436, a club head made of an FRP outer shell structure in which the core of the head body is filled with foamed synthetic resin. Although wood-type club heads have been developed, as is well known, there are various difficulties in manufacturing them due to the complexity of the head shape, and at present they have 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, and its gist is as follows: A hollow metal core that makes up the inner shell of the head is placed in a cavity of a mold having the shape of the outer periphery of the head, along with an FRP molding material that makes up the outer shell of the head, and hot-pressed, thereby creating a mold made of an inner shell made of metal and FRP. It is characterized by having a composite outer shell layer structure with an outer shell.

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

1 to 6 show a guest embodiment of the means for manufacturing a wood-type club head for golf according to the present invention, and FIG.
As shown in the drawings and FIG. 2, numeral 1 in the drawings is a hollow head body. The head body 1 has a composite outer shell layer structure including an outer shell layer 2 made of FRP and an inner shell layer 3 made of a metal layer made of a light metal alloy, and a club shaft 4 is attached at the tip end of the neck base 1a. 4a is inserted and fixed by penetrating the FRP outer shell layer 2 on the sole surface side, and the A
On the face plate 5 made of BS resin or hardened FRP, the sole surface 1c, and the pack 1d, a sole plate 6 made of a metal plate such as brass, and mass bodies such as pack weight material 7 are respectively arranged by manufacturing means described later. Fixed. In addition, 8 in the figure is a stopper that closes the insertion end side part 1'' of the club shaft 4 inserted into and fixed to the neck base 1a of the head body I, and 9 in the figure is a plug around the neck base 1a of the head body. It is a protective body that protects.

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 forms the rod-shaped jig) is used to form the club shaft shaft. In this case, the protector 9 is inserted and fixed in advance to the portion corresponding to the base of the head neck of the club shaft), 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, the FRP molding material 12 is coated on the surface of the metal core 11 by attaching or attaching, for example, Zorigreg, or by winding reinforcing fibers impregnated with an uncured liquid synthetic resin using the filament Weingang method. After that (see Fig. 3), a mold consisting of a pair of left and right split molds 13 and I/l]5
The head is placed in a cavity 16 having an outer peripheral shape of (in this case, although not shown, the surface of the mold is coated with a release agent and a gel coat layer in advance), and the rod-shaped head is formed by the split molds 13 and 14 during mold clamping. The leading edge part 1 of the jig 10
After positioning and fixing by the clamping action of the base of the protector 0a and the number of protectors 1, hot press molding is performed (see FIGS. 4 and 5). and,
After releasing the mold, a sixth step is performed to cut the tip end portion 1()a of the rod-shaped jig (club shaft) protruding toward the sole surface side of the head body 1.
(see figure), and by sealing the open L1 end, the wood club head shown in FIGS. 1 and 2 is obtained.

By the way, reinforcing fibers for use in FRP molding are composed of a suitable combination of cytocarbon fiber, glass fiber or d, Kepler, or a single use of carbon fiber or glass fiber. By inserting reinforcing members such as a face plate, sole plate, and pack weight mass into appropriate positions, it is possible to integrate the entire head body at the same time as hot-press molding. Alternatively, pressure may be applied from the core side by injecting a liquid at high pressure into the hollow part of the metal core during hot pressurization, thereby reliably preventing deformation of the metal core. Furthermore, if the metal core is perforated to adjust the overall weight or the center of gravity, the core member is formed separately and the perforated metal core is coated on its surface by an appropriate means. If the member is foamed 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 outside the mold release diameter to form a hollow member.

As explained above, in this invention, the metal core forming the outer shell of the head is attached to the surface of the hollow metal core forming the inner shell of the head.
The feature is that a head body consisting of a composite outer shell of FRP and metal is obtained by covering the RP molding material and placing it in the cavity of a mold having the outer circumferential shape of the head and heat-pressing it. The head can be easily molded, and since the metal core that makes up the inner shell of the head acts as an inner mold during molding, the finish is good, and costs can be reduced by improving productivity and mass production. It has excellent practical effects.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing a uniform embodiment of the golf club head according to the invention, Fig. 2 is an enlarged sectional view, and Figs. 3 to 6 are explanatory diagrams showing the manufacturing state. It is a diagram. 1...Head body, 2...FRP
Outer shell layer, 3...Metal inner shell layer, 11...
...Metal core, 12...FRP molding material,
13.14.15... Molding mold, 16... Cavity. Patent applicant: Nippon Musical Instruments Manufacturing Co., Ltd. Figure 3

Claims (1)

[Scope of Claims] (1) A golf wood club head in which a metal core constituting the inner shell of the head is placed in a cavity of a mold having an outer peripheral shape of the head together with an FRP molding material constituting the outer shell of the head and then hot-pressed. molding method. (2. A method for molding a golf club head according to claim 1, characterized in that Noripreg is used as the FRP molding material and the Noripreg is fused to the surface of a metal core. (3) In the method for molding a wood club head for golf according to claim 1, reinforcing fibers impregnated with an uncured liquid synthetic resin are used as the FRP molding material, and the reinforcing fibers are bonded to a metal core. A molding method characterized by wrapping and coating the surface.