JPH021512B2 - - Google Patents

Description

[Detailed Description of the Invention] [Object of the Invention] (Field of Industrial Application) This invention relates to fiber-reinforced plastics (hereinafter referred to as
Regarding the manufacturing method of the head of a wood golf club with an outer shell made of (abbreviated as FRP), the moldability and workability are improved by devising a method for forming the FRP outer shell that forms the head body. It is.

(Prior Art) In view of the drawbacks of conventional so-called wooden club heads, an FRP outer shell structure in which the core of the head body is filled with foamed synthetic resin has been developed, as disclosed in Japanese Patent Publication No. 51-21436. A wood-shaped club head was developed, but as is well known, the complexity of the head shape caused various difficulties in its specific manufacture. There is a need to improve various properties of the material strength of FRP in the surface area.

(Problems to be Solved by the Invention) There is a need to improve various characteristics of the material strength of FRP in the face surface portion of the head main body.
The FRP outer shell that forms the head body has a deformed, almost spherical shape, and its interior uses a core material that lacks durability. The elastic modulus is insufficient because high-grade FRP cannot be molded by applying the high temperatures or pressures required for molding, and this tendency is particularly large when the fiber arrangement itself is random, and the repulsion force when hitting the ball is Not only is it inferior, but the reinforcing effect of the fibers is also insufficient, and the thickness of the outer shell layer must necessarily be increased, resulting in an unavoidable increase in weight.

By the way, when hitting a ball, it is estimated that an impact of 5 to 10 tons is normally applied to the contact surface between the club head and the ball. In a club head with an FRP outer shell structure reinforced by fiber arrangement, the outer shell of the face surface lacks rigidity.In addition, in order to particularly improve the rigidity of the outer shell, FRP that uses long fibers for reinforcement Increasing rigidity by selecting only one material is not only extremely difficult in FRP molding, but also poses problems such as poor workability.

The object of the present invention is to produce a golf club which makes it possible to carry out the manufacturing means of the prior invention described above, and to enhance the reinforcing effect of the FRP outer shell of the head body, thereby improving the strength characteristics of the face surface. An object of the present invention is to provide a method for manufacturing a club head.

[Structure of the Invention] (Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides an FRP molding device for forming the outer shell of the head in a core mold forming the core of the head body. When the material is coated and placed in a mold having a desired external shape of the head and hot-press molded, together with an FRP (hereinafter abbreviated as CFRP) molding material using the carbon fiber as a reinforcing fiber, The feature is that a face plate made of hardened plate-like CFRP using carbon fiber as reinforcing fiber is placed in a predetermined position and integrated at the same time as molding.

(Function) That is, in this invention, by having the above structure, although the hardening times of the hardening molding of the face plate of the head and the hardening molding of the head outer shell are different in the process, both are of the same type. Because it is reinforced with reinforcing fibers, once the two are combined and the entire head is hardened and molded, the entire head becomes a continuous and integrated material that can follow the behavior of the ball when it is hit. This makes it possible to reduce the overall weight by making the FRP outer shell thinner, and also to increase the modulus of elasticity and the repulsive force when hitting the ball.

(Example) Hereinafter, the present invention will be described in detail with reference to illustrated embodiments.

As shown in FIGS. 1 and 2, numeral 1 in the drawings is a head body of a golf wood club according to the present invention obtained by a manufacturing process described later. The head body 1 is formed from an FRP outer shell layer 2 and a core material 3 made of foamed synthetic resin, etc. A club shaft 4 is inserted and fixed to the base 1a, and the hitting surface 1b is A face plate 5 made of hardened CFRP using carbon fiber as a reinforcing fiber is disposed, and a sole face plate 6 made of a thin plate metal such as brass is provided on the sole surface 1c, and a sole plate 6 made of thin plate metal such as brass is provided on the back surface 1d side. A mass body such as a back weight made of a metal material such as brass is embedded and fixed.

Further, reference numeral 8 in the figure indicates the base 1a of the head main body 1.
A stopper 9 closes the insertion side opening of the club shaft 4 which is inserted and fixed therein, and a protector 9 protects the attachment portion between the head main body base 1a and the club shaft 4.

That is, in order to manufacture the above-mentioned wood club head, as shown in FIGS. The core mold 11, which also serves as a rod-shaped jig (in this case, the protector 9 is inserted and fixed to the club shaft in advance), is attached to the tip of the rod-shaped jig 10, which is separately shaped in the shape of the core of the head body 1. The tip of the core mold 10a is supported and fixed in such a manner that a part of it completely penetrates and protrudes toward the sole side, and the entire peripheral surface including the outer peripheral surface of the core mold 11 and a portion corresponding to the base of the head body is covered with reinforcing fibers. Encapsulated with 12. The reinforcing fibers 12 are reinforced in the form of short fibers of 20 to 50 mm using carbon fibers, or are knitted in the form of long fibers into a hollow weave or the like. In that case, preferably one opening of the fibers is reinforced. It is closed to form a bag body, and the core mold 11 described above is placed inside the bag body.
By inserting the bag and pulling the other opening side, the bag can be narrowed and brought into close contact with the outer circumferential surface of the core mold 11 with good followability. The reinforcing fibers 12 made of short fibers or long fiber bags are impregnated with a matrix synthetic resin liquid such as epoxy resin or polyester resin (third
), at the same time, a face plate 5 made of hardened CFRP reinforced with carbon fibers, and a sole plate 6 and a back weight 7 as necessary.
These head forming materials are then placed in a cavity 16 having the outer shape of the head of a mold consisting of a pair of left and right split molds 13 and 14 (Fig. 4). and Figure 5). At this time, when positioning the core mold 11 in the cavity 16 of the mold 15, the tip portion 10a of the rod-shaped jig 10 and the mounting base of the protector 9 are held between the split molds 13 and 14 due to the mold clamping action. It is done by doing.

In this state, the club shaft 4 is cured and molded using hot pressure molding, and as shown in FIG.
A club head as shown in FIGS. 1 and 2 is obtained by cutting and removing the tip 10a of the rod-shaped jig 10 corresponding to the above, and sealing the cut opening with a plug 8. be.

Furthermore, the ball hitting portion (face surface) of the head body 1 is reinforced by laminating 2 to 30 layers of cloth with a minimum thickness of 0.3 mm. According to the present invention, the reinforcing method for the face part (face surface) is as follows:
It is preferable to attach it to the outside or inside of the laminate of CFRP molding materials, or to insert it between the laminates as necessary, and then mold and harden them to integrate them. Furthermore, the head body
The total thickness of the CFRP outer shell layer is set to 10-15 mm.

In the above embodiment, the core mold 11 was made of foamed synthetic resin or the like and left as it is in the core of the head body 1. It is also possible to form the head body into a hollow structure with only an outer shell by forming the head body from a metal or wax that can be melted by a mold, and expelling the head body to the outside after releasing the mold. In addition, the manufacture of a single face plate made of hardened CFRP reinforced with carbon fiber used in this invention requires high temperature or high pressure regardless of the temperature rise limit or pressure rise limit of other head constituent materials such as the core material. It has the advantage that it can be molded by applying pressure, and that it can be molded by selecting the arrangement state or type regardless of the fiber arrangement form of reinforcing fibers in other CFRP molding materials.

Therefore, in this invention, although the hardening times of the face plate of the head and the hardening of the outer shell of the head are different in the process, since both are reinforced with reinforcing fibers of the same type of material, Once the two are combined and the entire head is hardened and molded, the entire head becomes a continuous and integrated material that can follow the behavior of the ball when it is hit. A common way to make reinforcing fibers is to use 100% reinforcing fibers in both layers.
Although it is particularly desirable to standardize the percentage, it is not necessarily limited to this in view of the necessity of the club head's use. Even if carbon fiber is used as the main reinforcing fiber in the shell, and fibers of other materials such as glass fiber or aramid fiber are mixed in for the remainder, the effects of the present invention can still be obtained.

[Effects of the Invention] As is clear from the above description, according to the present invention, the core forming the core of the head body is reinforced with carbon fiber forming the outer shell of the head.
When a CFRP molding material is coated and placed in a mold having a desired external shape of the head, and hot pressure molding is performed, a face plate reinforced with carbon fiber is used as a member constituting the head together with the CFRP molding material. The head is placed at a position where it is integrated at the same time as it is molded, and the entire head is reinforced with carbon fiber, so it is easy to make the process of hardening the face plate of the head and hardening and molding the outer shell of the head. Although the hardening times are different, both are reinforced with the same type of reinforcing fibers, so once they are combined and the entire head is hardened and molded, the entire head becomes a continuous and integrated material, and when hitting a ball, This makes it possible to further increase reinforcement hardening, reduce the overall weight by thinning the FRP outer shell, and improve the elastic modulus and rebound when hitting the ball. It is possible to provide a method for manufacturing a wood club head for golf that has the excellent effect of increasing force.

[Brief explanation of drawings]

FIG. 1 is an explanatory view showing one embodiment of a wood club head for golf according to the present invention, FIG. 2 is a sectional view of the same, and FIGS. 3 to 6 are explanatory views showing the manufacturing state. 1... Head main body, 2... FRP outer shell layer, 3... Core material,
4... Face plate, 11... Core mold, 12... Reinforcing fiber, 15... Molding mold.

Claims (1)

[Claims] 1. A core mold forming the core of the head body is coated with a CFRP molding material forming the outer shell of the head, placed in a mold having a desired outer shape of the head, and then hot-press molded. A method for manufacturing a wood club head for golf, characterized in that a face plate made of hardened CFRP is placed in a predetermined position together with the CFRP molding material and integrated at the same time as molding.