JPS5922569A - Production 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 manufacturing a wood club head for golf with an outer shell made of fiber-reinforced plastic (hereinafter abbreviated as FRP). This is intended to improve moldability and quality.

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, as is well known, in such conventional devices, there are various difficulties in the specific molding method due to the complexity of the unique shape of the outer periphery of the head.

In addition, because the cavity shape of the mold used in general-purpose FRP molding is a fixed size, the volume of the constituent material for heged molding introduced into the cavity may vary due to variations in dimensions, variations in the amount of material used, or a combination thereof. If there is too much or too little due to unbalanced work, too much or too little of the clamping force will be applied to the FRP molding material that fills the mold during mold clamping, and such pressure instability during hot pressing will result. If the FRP molding material is made up of multiple laminates, there may be insufficient adhesion between the layers or 7 id (air bubbles) on the surface of the molded product due to the interlayer structure.
This could easily be the cause of such occurrences, and a decline in quality was inevitable.

The purpose of this invention is to eliminate the drawbacks of the conventional methods described above, and its gist is that an expandable A bag is stored, and an FRP molding material constituting the head outer shell is attached around the core molding material, and the bag is inserted into a cavity of a mold having the shape of the outer periphery of the head, and the bag is expanded. This is characterized in that the core molding material is pressed and expanded in the direction of the inner wall surface of the cavity of the mold before being hot-press molded.

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

As shown in FIGS. 1 and 2, numeral 1 in the figures is a head main body obtained by a manufacturing process described later.

? The FRP outer shell 2 has a laminated structure made of a plurality of reinforcing fibers. Further, a face plate 4 made of hardened FRP (carbon fiber is used as 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 1b.
And a pack part 1cl A sole weight member 5 and a pack weight member 6 made of different metals such as Cu brass are embedded and fixed as necessary. Furthermore, in the figure, 7 is a club 7 shaft fixed to the neck portion 1d of the head body I, and 8 is a cannon-shaped protector that protects the area around the attachment base of the club shaft 7 and the neck portion 1d of the head body. , these respective members are integrated at the same time as the head body is molded.

That is, in order to manufacture the above-mentioned head according to the present invention, as shown in FIGS. 3 to 7, a desired mold (not shown) is prepared in advance so that the outer circumferential shape of the head is smaller than that of the head, and the size of the mold is approximately similar to that of the outer circumferential shape of the head. A bag body 1 made of an expandable material is placed inside a hollow core molded material 11 made of an elutable material, which is made up of a pair of divided bodies 11 a and 11 b that are formed into upper and lower halves.
2 (see FIG. 3), and the FRP molding material 13 constituting the head outer shell is wrapped and attached around it (see FIG. 4).

At this time, the FRP molding material used is one in which reinforcing fibers consisting of multiple layers are impregnated with F0RISOREG or uncured liquid synthetic resin, and in particular surface mat or satin cloth is used as the reinforcing fibers in the outer layer. By using it alone or in combination with a hollow weave body, surface smoothness and shape followability can be improved, while by using mantle or hollow weave carbon fiber as reinforcing fibers in the inner layer, it is possible to improve the elastic modulus. suitable. Next, such a head molding material 14 is inserted and placed in the cavity 16 of a mold 15 having the outer peripheral shape of the head, and the bag body 12 inside the core molding material 11 is filled with liquid, fluid, or heated vaporizing agent. The core molding material 11 is expanded by injecting it from the outside at high pressure through an injection hole 17 opened in a portion corresponding to the heradosole portion of the mold 15.
The FRP molding material 13 surrounding the core molding material 11 is pressed against the inner wall surface of the cavity 6 while pressing and expanding it toward the inner wall surface of the cavity 16 of the mold 15 ( (See Figures 5 and 6). After molding, as shown in FIG.
After the core molding solvent is injected to elute the core molding material 11, the hollow part is filled with a foamable synthetic resin liquid 19 and foamed and hardened, and the shallow hole 18 is A wood club head as shown in FIGS. 1 and 2 is obtained by embedding the wood club head with a body or other appropriate members.

By the way, in the above example, the core molding material was also eluted as the bag was sloughed off after molding, but the core molding material may be left as is, or the hollow part may be filled with foamed synthetic resin. Whether or not this is the case is also arbitrary, and the effects of the present invention can be obtained in either case. Furthermore, a foamed synthetic resin made of polystyrene resin or polyurethane resin can be suitably used as the core molding material, and it can also be formed from FRP, which is the same material as the FRP constituting the outer shell. By curing the outer FRP/molding material, it can be integrally molded with it to form an outer shell structure.

In the above embodiment, a molding method in which the head molding material is directly inserted into the cavity of the mold and hot-pressed was explained as an example, but other embodiments may be used as shown in FIGS. In addition, another mold consisting of a male and female mold (
(not shown), - A pair of left and right divided bodies 21 and 22 made of FRP constituting the thin outer shell of the head, preferably divided into front and rear parts in the direction of ball hitting, are separately heated under as high temperature and pressure as possible. The two divided bodies 21 and 2 are molded.
The head molding material 14 is fitted into the mold 15.
There is also a molding means that is inserted into the cavity 16 of and integrates the two by heat and pressure.

As explained above, when the FRP molding material constituting the head outer shell is attached around the core molding material and hot-pressed, the core molding material is formed into a hollow shape and the inside of the core molding material is formed into a hollow shape. In addition to housing the bag, during hot pressing, the bag expands and the core molding material is pressed and expanded while molding is performed, so the core molding material in the mold expands and its Since the surrounding FRP molding material is pressed against the inner peripheral surface of the mold, the lack of pressure applied to the molding material as in conventional molding methods is eliminated, and insufficient adhesion between layers and the occurrence of +Wide can be reliably prevented. As a result, the quality and surface smoothness of FRP can be improved, and the overall weight can be reduced, resulting in excellent practical effects.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of a golf wood club head according to the present invention, FIG. 2 is an enlarged cross-sectional view of the main part, and FIGS. 3 to 7 are explanations showing the manufacturing process according to the invention. 8 and 9 are explanatory diagrams showing manufacturing steps according to other embodiments of the present invention. 11... Core molding material, 12... Bag body, 1
3... FRP molding material, 15... Molding mold, 16... Cavity. Patent applicant: Nippon Musical Instruments Manufacturing Co., Ltd. Figure 3, 4th floor, 4th floor, 7th floor, ¥J

Claims (1)

[Claims] (1) An inflatable bag is housed inside a hollow core molding material that is divided into at least two pieces, and an FRP molding material constituting the head outer shell is placed around the core molding material. The bag is attached and inserted into the cavity of a mold having the shape of the outer periphery of the head, and by expanding the bag, the core molding material is pressed and expanded in the direction of the inner wall surface of the cavity of the mold, and then hot-press molded. Manufacturing method for golf wood club heads. (2. In the method for manufacturing a golf wood club head as set forth in claim 1, the core molding material may be formed from a foamed synthetic resin having a substantially similar shape that is smaller in size than the outer circumferential shape of the head. Characteristic manufacturing method.