JPS6255435B2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to fiber-reinforced plastics (hereinafter referred to as
Regarding the method of molding a wood club head for golf with an outer shell made of (abbreviated as FRP), the occurrence of burrs on the molded product is prevented by laminating plates within the FRP outer shell molding material that makes up the head body. This is how it was done.

Conventionally, this type of wood club head has a structure in which the outer shell of the head body is made of FRP and the core is filled with foamed synthetic resin, as disclosed in Japanese Patent Publication No. 51-21436. There are things that I have.

However, when a core mold to which FRP molding material is attached is placed in the cavity of a mold consisting of split molds and the mold is clamped, some of the reinforcing fibers in the FRP molding material may be removed from the split mold. The reinforcing fibers are caught between the contact surfaces and form burrs, and when removing the burrs after demolding, some of the reinforcing fibers are cut and become discontinuous, resulting in various problems such as a decrease in overall strength. Easy to occur.

The purpose of this invention is to improve the above-mentioned drawbacks of the manufacturing method of the prior art, as well as to prevent the reinforcing fibers forming the FRP outer shell of the head body from being cut and to improve workability. This will be explained based on an example.

As shown in FIGS. 1 and 2, reference numeral 1 in the figures represents a head main body obtained by a manufacturing process described later.
The head body 1 is formed from an outer shell 2 made of FRP and a core material 3 made of foamed synthetic resin, and the FRP outer shell 2 has a plurality of laminated structures. In addition, a face plate 4 made of hardened FRP (carbon fiber is used as a reinforcing fiber) is provided on the face portion 1a of the head body 1, and a face plate 4 is provided on the sole portion 1a of the head body 1.
A sole weight member 5 and a back weight member 6 made of a metal material such as brass are embedded and fixed in the back portion 1c as required. FRP constituting the head body 1
A thin plate material 7 made of hardened FRP or metal is buried in the outermost surface of the outer shell 2, and the thin plate material 7 covers part or all of the contact line of the split mold, which will be described later. It is arranged to span the length. Furthermore, in the figure, 8 is a club shaft inserted and fixed to the neck portion 1d of the head main body 1, and 9 is a club shaft 8 and the neck portion 1 of the head main body 1.
It is a cap-shaped protector that protects the area surrounding the attachment base of the head body, and each of these members is integrated at the same time as the head body is molded.

That is, in order to manufacture the above-described wood club head, as shown in FIGS. 3 to 5, a foamed material separately shaped into the core shape of the head body is added to the core metal material 10 corresponding to the club shaft member. A core material 11 made of synthetic resin or a low melting point metal for hollow molding is bonded together and fixed in such a state that the tip end 10a of the core material 10 partially protrudes toward the sole surface of the core material 11,
Next, a plurality of layers of FRP molding material 12 such as prepreg or wet method are wound and coated on the circumferential surface of the core material 11, and at the same time, the inside, outside, or internal head body face portion of the FRP molding material 12 is coated.
A face plate 1 made of hardened FRP is installed in part or all of the parts corresponding to the sole and back parts.
3. Temporarily hold other members such as the sole member 14 or back member 15 made of a metal material such as brass as necessary, and at least a portion of the entire circumference of the portion corresponding to the contact line of the split mold, which will be described later. Thin plate material 1 made of hardened FRP, hard thermoplastic resin, or metal on the outermost surface or between layers near the layer surface
6 is attached or buried (see Figures 3 and 4). At this time, as the reinforcing fibers of the FRP molding material 12, carbon fibers, glass fibers, Kevlar, etc., alone or in a suitable combination, knitted in a hollow weave shape are preferably used, and matte fibers are also used. In particular, by superimposing surf esmat or satin cloth on the outer side of the head,
It is desirable to improve the surface smoothness and followability of the shape, and to use roving cloth for the face portion. Then, such head molding materials 10, 11, 12, 13, 14, 15, 16 are molded into a pair of left and right split molds 17, 18 having the outer shape of the head.
(see Fig. 5), and when the mold is clamped, the tip 10a of the core material 10 and the portion corresponding to the neck side of the head body are held between the abutting portions of the split molds 17 and 18. By positioning and fixing, the thin plate material 16 is aligned with the line of contact L between the split molds 17 and 18.
The club head as shown in FIGS. 1 and 2 is made by positioning it so as to straddle the area and clamping the mold, followed by hot-press molding, and after releasing the mold, the core metal material 10 is pulled out and a club shaft is separately inserted. This is what you get.

In addition, as another example of the present invention, in the case where the sole member is temporarily held by the FRP molding material constituting the head molding material when attaching the thin plate material to the mold matching contact line of the split mold, , there is no need to attach it all around the contact line, and it is possible to attach thin plate material.
It is also possible to attach it flush to the outer surface of the FRP molding material or to insert it in a layer. In this case, the thin plate material is coated with a mold release agent, and after molding,
It is also possible to remove the sheet material from the head. At this time, if the thin plate material is attached to the surface of the outermost layer of the FRP molding material, it is possible to completely eliminate the molding material that is sandwiched between the mold mating surfaces when the split mold is clamped. Although the purpose of the invention can be realized to the maximum, if the thin plate material is used close to the outer surface of the FRP molding material and buried between the laminated layers, the molding material located outside the thin plate material may be buried. Although a portion of the material is sandwiched between the mold mating surfaces and formed into a burr-like shape as in the conventional method, all of the molding material on the inside of the thin plate material is protected even during mold clamping, and the effect of the present invention is to harden the molding material. can be realized. In this case, since the thin plate material is not exposed to the outside, the appearance is conveniently consistent with other parts of the molded product.

As explained above, in this invention, the outer peripheral surface is
When the head molding material wrapped and coated with the FRP molding material is inserted into a pair of split molds, the molds are clamped, and the head molding material is heat-pressed, the surface portion of the FRP molding material corresponding to the contact line of the mold fitting of the split molds. Attach thin plate material to
Since the thin plate material is positioned so as to straddle the mold alignment line, the thin plate material can prevent the FRP molding material from being inserted at the mold matching abutment part of the split mold during conventional mold clamping. As a result, the occurrence of burrs can be completely or even lessened, so the continuity of the reinforcing fibers can be maintained sufficiently, and a decrease in strength can be reliably prevented, which has excellent practical effects. It is something that plays.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an embodiment of a wood club head for golf according to the present invention, Fig. 2 is a sectional view of the main part thereof, and Figs. 3 to 5 are explanations showing the manufacturing process according to the invention. It is a diagram. DESCRIPTION OF SYMBOLS 1... Head main body, 1a... Face part, 1b... Sole part, 1c... Back part, 11... Core material, 12...
FRP molding material, 16... Thin plate material, 17, 18...
Split type, L...type contact line.

Claims (1)

[Claims] 1. On the circumferential surface of the core material constituting the core of the head body.
When the head molding material with the FRP molding material attached is inserted into a pair of split molds, and the molds are clamped and then hot-pressed, a surface portion of the head molding material corresponding to the contact line of the split molds, A method for manufacturing a wood club head for golf, characterized in that a thin plate material is attached in advance so as to span at least a part of the tangent line. 2. A method for manufacturing a wood club head for golf according to claim 1, characterized in that the FRP molding material is formed into a plurality of laminated layers, and a thin plate material is embedded between the outer layers. . 3. A method for manufacturing a wood club head for golf according to claim 1, characterized in that the thin plate material is placed on the outer surface of a head molding material.