JPH0476714B2 - - Google Patents

Description

[Detailed Description of the Invention] [Objective of the Invention] (Industrial Application Field) The present invention relates to a golf club head having an outer shell made of fiber-reinforced plastics (hereinafter abbreviated as FRP), such as a wood club head. Concerning the manufacturing method.

(Prior Art) Conventionally, in manufacturing this type of golf club head, for example, a wood club head, fibers approximately 1 inch in length were impregnated with an uncured thermosetting synthetic resin liquid and semi-cured. A method of molding FRP molding material into a desired club head shape using transfer molding means, or a method in which a core component is inserted into a cavity in a mold in advance, and the inner peripheral wall surface of the cavity of this mold and the core component are A method of forming a gap between the head and the outer peripheral surface of the head and press-fitting the above-mentioned FRP molding material into the gap to form a head molded body, or a thermoplastic synthetic resin liquid such as ABS resin or polycarbonate resin. By injection molding raw material for molding by kneading short fibers made of short carbon fibers,
Methods have been proposed that allow molded head bodies to be molded.

(Problems to be Solved by the Invention) However, although the above-mentioned conventional head forming means, that is, transfer forming means, is simple, the reinforcing fibers are short fibers, so the head main body is not strong enough. This required special consideration in the design.

In addition, although the method for manufacturing club heads using the injection molding method described above is the simplest manufacturing method due to the combination of thermoplastic synthetic resin liquid and short fibers, it has the problem that it is the most inferior in terms of strength and performance. .

This invention was made under the above circumstances, and its purpose is to avoid the influence on the core component material due to the feeding pressure when feeding raw material for FRP outer shell molding. It is an object of the present invention to provide a manufacturing method for a golf club head which can improve the strength of the outer shell skin part of the head after molding.

[Structure of the invention]

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides a head in advance at the mouth of the feeding tube for the green material for FRP outer shell molding to be fed into the cavity of the molding die. A step of penetratingly supporting the core component material, and a long fiber cloth impregnated in advance with an uncured liquid thermosetting synthetic resin around the head core component material penetratingly supported at the mouth of the feeding tube. a step of encapsulating the fiber material for forming the head skin, and positioning and fixing the head core constituent material covered with the fiber material for forming the head skin by inserting the mouth of the feeding cylinder into the cavity of the mold. At the same time, the feeding tube is exposed to the outside of the mold, and the feeding tube is placed in the gap between the cavity of the mold and the head core component material in which the head skin forming fiber material is encapsulated. This method is characterized by the step of feeding the raw material for forming the FRP outer shell through a cylinder and hardening and forming the head outer shell molded product.

(Function) That is, the present invention has the above-mentioned configuration, so that a predetermined gap is provided around the cavity in the mold, and the opening of the feeding tube for raw material for forming an FRP outer shell is penetrated in advance. The supported core component is inserted, positioned and fixed, and a fiber material for forming the head skin made of long fiber cloth is wrapped around the core component in advance, and FRP is placed in the cavity gap in the mold.
Since the raw material for forming the outer shell is fed in, it is possible to avoid the influence on the core constituent materials due to the feeding pressure when feeding the raw material for forming the FRP outer shell, and the Due to the feeding pressure of the raw material for molding, the fiber material for forming the head skin is pressed against the inner wall surface of the cavity of the mold, and as a result, after hardening and molding, the most deformation strain due to the impact when the ball is hit is minimized. Since it is possible to form an FRP skin layer in which fiber reinforcing material made of long fiber cloth is intermixed on the head outer shell skin part with a large area, it is possible to dramatically increase the strength and performance of the head outer shell. .

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

As shown in FIG. 1, numeral 1 in the figure is a head body of a golf wood club according to the present invention obtained by a manufacturing process described later. This head body 1
The head is formed of an outer shell 2 made of FRP and a hollow core 3, and on the surface side of the head outer shell 2, reinforcing fibers such as long fiber cloth such as carbon fiber or polyaramid fiber are provided. While the arranged skin layer 21 is integrally formed, a sole plate 4, which is a plate-shaped weight member made of a metal material such as brass, is attached to the head sole surface 1a. This sole plate 4 is formed when the hollow core 3 of the head body 1 is formed.
The head outer shell 2 has a protrusion 4a that is fitted into a hole 2a formed on the head sole surface 1a side so as to cover the hole 2a. In addition, 5 in the figure is a hardened ball using carbon fiber as a reinforcing fiber, for example, embedded in the FRP outer shell 2 of the ball hitting surface 1b of the head body 1.
A face plate made of FRP or ceramics, 6 a back weight member made of a metal material such as brass provided on the back surface 1c of the head body 1, and 7 inserted and fixed into the neck surface 1d of the head body 1. It is a shaft.

That is, in order to manufacture the above-mentioned club head according to the present invention, as shown in FIGS. 2 to 6, the core component material 11 as a core having a shape almost similar to the shape of the head core is prepared in advance from a meltable material. Separately molded with melting point alloy. At the same time, a holding hole 12 is formed in the center of the core component 11 upward from the bottom side corresponding to the head sole side, and a cylindrical FRP molded material made of metal material etc. is formed in the holding hole 12. By inserting the tip opening 13a of the feed tube 13 for feeding green material, the core component 11 is held so as not to be displaced with respect to the feed tube 13, and this A sleeve material 14 made of long fiber cloth and a cloth material 1 are placed around the core component material 11.
The fibrous material for forming the head skin, which consists of 5 and 5, is wrapped in double layers with some allowance (see Fig. 2).

Next, such head core molding material is inserted into molds 16 and 17 consisting of a pair of left and right split molds,
and a mold hole 19 penetrating toward the cavity 18 formed by clamping these molds 16 and 17.
The feeding tube 13 is clamped and fixed with its base 13b side protruding outward, and a head skin forming fiber material consisting of a sleeve material 14 and a cloth material 15 is placed around the periphery with a margin of 2. The outer peripheral surface of the heavily encapsulated core component 11 and the molds 16, 17
The head is positioned and fixed so that a gap A corresponding to the thickness distribution of the head outer shell is formed between the head and the inner circumferential wall surface 18a of the cavity 18 (see FIG. 3).

At this time, an air vent hole (not shown) communicating with the gap A is formed around the base 13b of the feed tube 13 for the raw material for FRP molding which is held between the mold holes 19 of the molds 16 and 17 (note that The function of this air vent hole may be achieved by the gap created between the mold hole 19 and the base 13b of the feeding tube 13 without any special setting), or the core component 11 or the mold 16, 17, the part corresponding to the ball hitting surface, back surface or sole surface has been hardened.
Face plates made of FRP, ceramics, etc.
If necessary, weight members and the like are placed in a temporarily fixed state.

In this state, using the feed tube 13 of the raw material for FRP molding protruding outside the molds 16 and 17 as a cylinder, the polyaramid fibers are transformed into reinforcing fibers by the pushing action of the piston body 31 from inside the base 13b side. BMC or SMC such as prepreg sheet with reinforcing fibers oriented in a single direction
A raw material 30 for molding an FRP outer shell is fed into the gap A in the molds 16 and 17 from the tip opening 13a of the feeding tube 13 (see FIG. 4). At this time, the fiber material for forming the head skin is composed of the sleeve material 14, which is a long fiber cloth, and the cloth material 15, which are double wrapped with a margin around the core component 11, and the fiber material for forming the head skin is made of the FRP. Due to the feeding pressure of the raw material for forming the outer shell, the cavities 18 of the molds 16 and 17 are
They are pressed against the inner wall surface 18a side of the inner wall surface 18a so that they can be arranged. Moreover, the air in the gap A is
As the raw material 30 for forming the FRP outer shell is fed, it is discharged from the air vent hole (not shown), thereby making it easier to uniformly fill the raw material 30 for forming the FRP outer shell into the void A. By performing hardening molding in this state, a head skin layer 41 is formed on the surface side of the head outer shell molded body 40 after hardening and molding.

In this way, after the head outer shell molded body 40 is hardened and molded, the temperature of the molds 16 and 17 is raised again to heat the head outer shell molded body 40 as a whole, and the core component 11 is melted and the core component 11 is melted. The tube 13 is put into the mold 16,
At the same time, it is extracted and removed from the inside of the mold 17 and eluted to the outside from the mold cavity 19 (see FIG. 5).

Furthermore, after elution of the core constituent material 11 described above,
A sole plate 4 made of a plate-shaped weight member made of a metal material such as brass is attached to a portion corresponding to the sole surface of the head outer shell molded body 40, and the head outer shell molded body 40 is attached with a protrusion 4a protruding from the sole plate 4. By covering the core constituent material elution hole 40a formed in the portion corresponding to the sole surface (see Fig. 6),
A head molded product as shown in FIG. 1 is obtained.

According to the above-mentioned manufacturing means according to the present invention, the tip opening portion 13a of the cylindrical raw material feeding tube 13 for FRP molding is made to face inside the forming molds 16 and 17, and the outer circumference of the tip portion 13a is Core component 11 on the side
The sleeve material 1 is supported as a long fiber cloth around the core component material 11.
After wrapping the fiber material for forming the head skin, which consists of the cloth material 15 and the cloth material 15, it is positioned by the fixing means of the feed tube 13 which is held in the mold hole 19 by the clamping action of the molds 16 and 17. mold 16,
The feeding cylinder 13 is passed through the gap A for forming the head outer shell formed between the inner circumferential wall surface 18a of the cavity 18 of No. 17 and the outer circumferential surface of the core component 11.
Since the raw material 30 for forming the FRP outer shell is fed, the opening of the tip opening 13a of the feeding tube 13 always faces the inner peripheral wall surface of the molds 16 and 17, and the FRP outer shell Since the pressure when feeding the raw material for molding does not directly act on the core component 11 side, it is possible to stably position the core component within the mold.

By the way, the raw material 30 for forming the FRP outer shell is as follows:
A suitable combination of carbon fiber, glass fiber, or polyaramid fiber is used as the reinforcing fiber, and a non-foaming or foaming liquid synthetic resin for the matrix is added to the fiber body of a cloth or a unidirectional bundle of these fibers with a length of 20 to 50 mm. It is impregnated with a thermosetting or thermoplastic uncured liquid synthetic resin, semi-cured and cut. In particular, when a thermoplastic uncured liquid synthetic resin is used as the matrix liquid synthetic resin, the above-mentioned It is better to impregnate the reinforcing fibers with a thermosetting uncured liquid synthetic resin in advance.

Further, as the long fiber cloth as the fiber material for forming the head skin, carbon fibers or polyaramid fibers are preferably used, and in this case,
When the raw material 30 for forming the FRP outer shell uses a foamable uncured liquid synthetic resin as the liquid synthetic resin for the matrix, it is preferable to use a head skin forming fiber material in a non-impregnated resin state. It is better to use a prepreg in which the skin-forming fiber material is impregnated with a thermosetting uncured liquid synthetic resin. Furthermore, this fiber material for forming the head skin was added to the core component 1.
1, various weight members etc. are inserted in advance between the head skin forming fiber material and the core component material 11, and packed and arranged as necessary. , it is also possible to attach the head shell molded body 40 integrally at the same time as the molding of the head shell molded body 40.

Furthermore, in order to elute and remove the core constituent material 11 after molding the head shell molded body 40, a mold hole is formed in a corresponding part of the back part 1c in addition to the sole part 1a as in the above embodiment. It is also possible to elute and remove by opening or using a shaft insertion hole.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, there is a core in which a predetermined gap is provided around the cavity in the mold, and the opening of the feeding tube for raw material for forming an FRP outer shell is penetrated and supported. At the same time as inserting, positioning and fixing the core component materials, a fibrous material for forming the head skin made of long fiber cloth is wrapped in advance around the core component material, and a material for forming the FRP outer shell is placed in the cavity cavity in the mold. Since the materials are sent in,
It is possible to avoid the effect on the core component material due to the feeding pressure when feeding the raw material for forming the FRP outer shell, and the fibrous material for forming the head skin can be are pressed against the inner wall surface of the mold cavity, and as a result, after hardening and molding, a fiber reinforcing material made of long fiber cloth is applied to the outer skin of the head shell, which undergoes the largest deformation strain due to the impact of hitting the ball. It is possible to provide a manufacturing method for a golf club head that has the excellent effect of dramatically increasing the strength and performance of the outer shell of the head because it is possible to form an FRP skin layer in which FRP is intermixed. be.

Although the golf club head described above mainly uses a core material, it is not necessarily limited to the case where a core material is used, and long fiber cloth can be directly fed without using a core material. The effects of the present invention can be obtained even when molding is performed by encasing the mouth of a cylinder.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a main part showing an embodiment of a golf club head manufactured by the golf club head manufacturing method according to the present invention, and FIGS. 2 to 6 are explanatory diagrams showing the manufacturing process. 11...Core component material, 13...Feeding tube, 13a
... Tip mouth portion, 14, 15 ... Fibrous material for forming head skin, 16, 17 ... Molding mold, 18 ... Cavity, 18a ... Inner peripheral wall surface, 30 ... Raw material for forming FRP outer shell, 40 ...Head outer shell molded body, A...
void.

Claims (1)

[Scope of Claims] 1. A step of penetrating and supporting a head core constituent material in advance through the mouth of a feeding cylinder of raw material for forming an FRP outer shell that is fed into a cavity of a mold, and the mouth of the feeding cylinder. a step of enclosing a head skin-forming fibrous material made of long fiber cloth impregnated with an uncured liquid thermosetting synthetic resin in advance around the head core constituent material that is supported through the head; Insert the mouth of the feeding cylinder into the cavity to position and fix the head core constituent material encapsulated with the fiber material for forming the head skin, and also expose the feeding cylinder to the outside of the mold. step, and a gap between the cavity of the mold and the head core constituent material in which the head skin forming fiber material is encapsulated,
A method for manufacturing a golf club head comprising the steps of feeding raw material for forming an FRP outer shell through the feeding tube and curing and molding a head outer shell molded body. 2. Scope of Claims In the method for manufacturing a golf club head according to claim 1, the core component is used as a meltable core,
A manufacturing method characterized in that the head outer shell molded body is eluted and removed to the outside after hardening and molding.