JPS60122581A - 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] [Technical Field of the Invention] This invention relates to Il miscellaneous reinforced plastics (hereinafter referred to as F[<P
This invention relates to a method for manufacturing a golf wood club head having an outer shell made of

[Technical landscape of the invention and its problems]

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 the molding of FRP for membranes has a fixed size, the volume of the component material for head 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 an excess or deficiency in the capacity due to unbalanced work or the shape retention of the core material, there will be an excess or deficiency in the clamping force applied to the FRP molding material filled in the mold during mold clamping. When the FRP molding material is made of a complex laminate, the pressure instability during hot pressing can cause insufficient adhesion between layers and the occurrence of voids (bubbles) between layers or on the surface of the molded product. However, a decline in quality was inevitable.

[Purpose of the invention]

This invention was made under the above circumstances, and its purpose is to improve moldability and quality by not devising the means for molding the FRP outer shell that constitutes the head body. An object of the present invention is to provide a method for manufacturing a wood club head for golf.

(Summary of the Invention) In order to achieve the above-mentioned object, the present invention preferably prepares two or three shell bodies having a shape corresponding to the inner shell of the head without simultaneously and integrally forming the whole shell body.
The FRP is molded separately into separate pieces and connected and integrated by means such as adhesive fitting or screwing, and the head outer shell is constructed around the shell.
The feature is that a molding material is attached and inserted into the mold, and the two are integrated by hot pressing.

[Embodiments of the invention]

Hereinafter, this invention will be explained based on illustrated embodiments.
As shown in FIGS. 1 and 2, reference numeral 1 in the figures represents a head body of a wood club obtained through the manufacturing process described later.

The head body 1 consists of an FRP outer shell 2 and a hollow core 3.
a and an inner shell 2b, and if necessary, the face part 1a is provided with a face plate 4 made of hardened FRP, and the sole part 1b and back part 1C are made of a metal material such as brass. A sole weight member 5 and a back weight member 6 are embedded and fixed, respectively.

Furthermore, in the figure, 7 is a club shaft inserted and fixed into the neck portion 1d of the head body 1, and 8 is the club shaft 7.
This is a cap-shaped protector that protects the periphery of the attachment base between the head body neck portion 1d and the head body neck portion 1d.

That is, in order to manufacture the above wood club head, as shown in FIG. 3a or 3b, a mold (
Head inner shell 1 made of semi-hardened FRP and having a shape similar to the head core shape (not shown)
1 is separately molded into two or three divided bodies 11a and 11b in the upper and lower or front and rear parts.

Next, these divided bodies 11a and 11b are connected and integrated by adhesive etc. to form an internal structure shell, and then around it,
As shown in FIG. 4, the FRP molding material 12 constituting the head outer shell is wound and coated, and the head molding material 13 is
As shown in FIG. 5, a mold 1 having a head outer peripheral shape
The wood club head shown in FIG. 1 and FIG. 2 is obtained by inserting the wood club head into the cavity 15 of No. 4 and applying heat pressure to integrate the two.

By the way, in the above embodiments, as the reinforcing fibers in the FRP molding material constituting the head outer shell, matte or hollow weave carbon fibers, carbon fibers, glass fibers, Kevlar, etc. are appropriately combined to improve the elastic modulus. In addition, it is possible to improve workability by leaving the resin in a semi-cured state after impregnating it with resin liquid, or by using a surface mat or satin cloth as a reinforcing fiber in the FRP molding material for the outer part to improve surface smoothness. It is preferable to use it in a state in which it is impregnated with an uncured liquid resin while being stretched so as to improve shape followability. However, both FRP molding materials can be used in a state where reinforcing fibers are impregnated with uncured liquid synthetic resin by hand lay-up method or the like.

In addition, when arranging the face plate, sole weight member, or back weight member at appropriate positions on the head body, FRP molding is performed when molding the inner head shell or when attaching outer shell molding material to the inner head shell. By incorporating and embedding it in the material for use, it is possible to integrate the head at the same time as molding the head.

Furthermore, the appearance can be improved by coloring the uncured liquid synthetic resin in the FRP molding material used to mold the FRP outer shell.

(Effects of the Invention) As explained above, the present invention is characterized in that the shell body constituting the inner head shell is molded separately into several pieces, and the FRP molding material constituting the outer head shell is placed around the connected body. The head body is made of a composite outer shell, which is coated with a composite outer shell, placed in the opening of a mold having the outer circumferential shape of the head, and heat-pressed. It is easy to perform one molding using a core structure that is similar to the conventional molding method, and the shell that forms the inner shell of the head plays the role of a high-precision inner mold during molding. The excess or deficiency of the void volume to be filled with the molding material due to the dimensional instability of the material is resolved, and the reinforcing fibers when cutting are removed from insufficient interlayer adhesion, voids, or spalling caused by excess molding material. This has excellent practical effects, such as preventing continuity breakage, thereby improving the quality and surface smoothness of FRP, and reducing the overall weight a.

[Brief explanation of the drawing]

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. 3a, 3b to 5 show the manufacturing process according to the invention. FIG. DESCRIPTION OF SYMBOLS 11... Inner shell, 11a, l1b... Divided body, 12... FRP molding material, 13... Head molding material, 14... Molding mold. Figure 3(a)

Claims (1)

[Claims] The inner shell is preliminarily separated into divided bodies, which are then molded, and then after the divided bodies are connected, an FRP molding material is attached around it, and the material is inserted into a mold and hot-pressed. A manufacturing method for golf wood club heads that integrates both.