JPS6045543B2 - Manufacturing method for golf club head - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a wood club head for golfers whose outer shell is made of fiber-reinforced plastic (hereinafter abbreviated as FRP) or the like. By devising the attachment means, moldability and quality are improved.

Conventionally, this type of wood club head was
As disclosed in Japanese Patent No. 1-21436, there is a head body having a structure in which the outer shell of the head body is made of FRP and the core is filled with foamed synthetic resin.

However, as is well known, with such conventional products, there are various difficulties in the specific molding method due to the complexity of the unique shape of the outer periphery of the head, as well as problems due to increased inertia. In order to increase flight distance, the face plate is made of hardened FRP etc. for the face part where maximum strength is required.
If it is attached separately, it takes time and effort to insert and arrange it into the mold, and even if it is simply placed in the FRP molding material, it is likely to be displaced due to flow hardening during hot pressure. In addition, because the face plate is a highly rigid material, it cannot be molded to fit the mold surface, and molding it to the shape that corresponds to the club size requires a large amount of process and expense, leading to various problems. Ta.

The purpose of this invention is to improve the manufacturing means by the above-mentioned conventional method. The material is inserted into a pre-formed FRP outer shell and hot-pressed, and a plurality of reinforcing fibers are separately laminated in advance on a portion corresponding to the face of the FRP outer shell to increase the thickness. It is something to do.

Next, the present 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 a manufacturing process described later.

The head body 1 is composed of an FRP outer shell 2 and a core material 3 made of foamed synthetic resin, etc. The FRP outer shell 2 includes a first FRP 21 forming a thin outer shell, and a relatively thick outer shell 21. It has a laminated structure with the second FRP 22 forming an inner shell, and the FRP outer shell 21a in the part corresponding to the face part 1a is a thick part, and the sole part lb and the back part lc have a layered structure. A sole weight member 4 and a back weight member 5 made of metal materials such as brass are embedded and fixed, respectively. Furthermore, in the figure, 6 is a club shaft that is inserted and fixed to the neck portion 1d of the head body 1, and 7 is a cap-shaped protector that protects the periphery of the attachment base between the club shaft 6 and the neck portion 1d of the head body. be. That is, in order to manufacture the above-mentioned wood club head, as shown in FIG. A pair of divided bodies 11 and 12 made of a first FRP molding material having a predetermined shape constituting a thin outer shell of the head are separately thermoformed at the highest possible temperature and pressure, and
A portion 12a of the front split body 12 corresponding to the face portion of the head body is formed thick.

On the other hand, as shown in FIG.
The second FRP molding material 14 in which reinforcing fibers are impregnated with prepreg or liquid powder cured synthetic resin is wound and coated to form an internal molding material 15, and then the internal molding material 15 is As shown in the figure, by inserting and fitting into the hollow interior formed by the pair of divided bodies 11 and 12 using a suitable mold 16, and heat-pressing the two to integrate them, as shown in FIG. It is shown in Figure 2. This allows you to obtain a wood club head with a high quality wood club head. By the way, in the above embodiment, when molding the divided bodies constituting the head outer shell, especially the divided bodies on the face side, carbon was used as the reinforcing fiber body in the first FRP molding material used. Use one to two pieces of surface mat made of fiber or a combination of carbon fiber and glass fiber, or vermilion cloth to make the entire surface thinner, improve surface smoothness and shape followability, and cover the area corresponding to the face. In order to increase the wall thickness by using 5 to 1 fiber cloth, and to shift the center of gravity to the lower side, the thick part is distributed so that it becomes thicker from the top to the bottom (T1 ≦
:T2).

On the other hand, the second FRP molding material that is wrapped and coated around the core material can be prepared by simply wrapping prepreg, or by inserting the core material into a hollow weaved reinforcing fiber body and impregnating it with liquid synthetic resin. Furthermore, liquid synthetic resin-impregnated fibers are wound around a core material and bowed to form a relatively thick layer.
In addition, sole weight members are placed at appropriate positions on the head body.
Or when placing the back weight member,
By incorporating and embedding it in the first FRP molding material or the second FRP molding material when molding the divided body or molding the internal molding material, it is possible to integrate the head at the same time as molding. Furthermore, the appearance of the FRP outer shell can be improved by coloring the unhardened liquid synthetic resin in the FRP molding material. As explained above, this invention thickens the portion corresponding to the face portion of the head main body when molding the outside of the head, which is hardened and molded separately in advance.
F forming a head inner shell around the core material within the outer shell.
The RP molding material is rolled and coated with the inner molding material, which is inserted and integrated under heat and pressure, thereby making the FRP outer shell a laminated structure of the outer shell and the inner shell, and separating their molding processes. As a result, the FRP outer shell can be molded by applying high temperature and high pressure, shortening the molding time, and is made of high-quality FRP with no residual air bubbles, high density, and rich surface smoothness. Even if defects such as air bubbles (voids) that tend to occur under the molding conditions of the inner shell, where molding is forced at low temperatures and low pressures, can be hidden on the surface by the FRP outer shell. Furthermore, the ball-hitting surface can be formed extremely easily and with high precision, resulting in excellent formability.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a perspective view showing an embodiment of a golf club head according to the present invention, Fig. 2 is an enlarged cross-sectional view of the main parts, and Figs. 3 to 5 are manufacturing methods according to the present invention. It is an explanatory diagram showing a process.

1...Head body, 1a...Face part, 2...FRP outer shell, 21...Outer shell,
21a... Face equivalent part, 22...
Inner shell, 3... Core material, 11, 12...
Divided body, 12a... Thick part, 13... Core material, 14... FRP molding material, 15...
...Material for internal molding.

Claims (1)

[Claims] 1. The inner molding material, which is wrapped around the core material and covered with the FRP molding material constituting the inner shell, is wrapped in a pre-molded FRP
A method for manufacturing a wood club head for golfers, which comprises a step of inserting it into an outer shell and hot-pressing it, and is characterized in that a plurality of reinforcing fibers are separately laminated in advance on a portion corresponding to the face surface of the FRP outer shell to increase the thickness.