JPH0417671B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention relates to fiber reinforced plastics (hereinafter referred to as
This invention relates to a method for manufacturing a wood club head for golf with an outer shell made of (abbreviated as FRP).

[Conventional technology]

Conventionally, in the manufacturing method of this type of wood club head, reinforcing fibers are first placed in the mold, and then
Some methods are carried out by injecting and impregnating synthetic resin.

[Problem to be solved by the invention]

However, in such conventional manufacturing methods, the reinforcing fibers are not sufficiently impregnated with synthetic resin, resulting in unimpregnated or insufficiently impregnated areas, which reduces the strength of the FRP outer shell layer of the head body and reduces the strength when hitting a ball. Poor durability.

In addition, as a means of compensating for the above-mentioned drawback of insufficient resin impregnation of reinforcing fibers, reinforcing fibers are pre-impregnated with synthetic resin outside the mold, and such molding material is press-fitted into the mold to harden and mold. something is proposed.

However, although this type of manufacturing method completely eliminates the problem of insufficient resin impregnation into the reinforcing fibers, the fiber arrangement direction of the reinforcing fibers is random, so
Not only does the microscopic surface layer on the ball hitting surface of the head body, which receives a strong impact when hitting a ball, lack strength, but
A decrease in aesthetic appearance due to random fiber arrangement is unavoidable.

[Purpose of the invention]

The object of this invention is to use FRP on the ball hitting surface of the head body.
An object of the present invention is to provide a method for manufacturing a wood club head for golf, which can improve strength and aesthetic appearance by increasing the density by giving directionality to the fiber arrangement.

[Means to solve the problem]

In order to solve the above problems, this invention
A feed cylinder is inserted and held in the mold, and the raw material for FRP molding is fed into the mold through the feed cylinder and is cured and molded, and the material is hardened to the part corresponding to the ball hitting surface of the head in the mold. It is characterized by being made by temporarily fixing finished FRP boards in advance.

In this case, a semi-cured sheet-like FRP raw material for molding may be placed in advance in a portion of the mold that corresponds to the ball-striking surface of the head, or a weight adjustment member may be placed in a portion of the mold that corresponds to the center of the head or the rear of the head. It is preferable to temporarily fix it in advance.

Preferably, the feeding tube is arranged parallel to a portion of the mold corresponding to the ball hitting surface of the head, or its mouth is inserted deeper than the center of the mold.

Furthermore, when placing the weight adjusting member in the mold, it is preferable that the weight adjusting member be fitted into the feeding tube.

[Effect]

That is, in this invention, a feed cylinder is inserted and held in a mold, and raw material for FRP molding is fed and filled into the mold through this feed cylinder, hardened and molded, and the head of the mold is heated. Hardened on the surface area
Since the FRP boards are temporarily fixed in advance, the head molded product is made by hardening the FRP board and the raw material for FRP molding by feeding and filling the raw material for FRP molding into the mold. are integrated, and the strength of the ball hitting surface can be improved.

In addition, since the cured FRP board is cured and molded into a plate shape separately outside the mold, it is possible to apply high temperature and pressure during molding, and the fiber alignment and resin impregnation are sufficient, resulting in high density and high quality. can be obtained, and the aesthetic appearance can be improved.

[Embodiments of the invention]

Hereinafter, the present invention will be described based on the 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. The head body 1 has a structure in which a hollow part 3 is formed in the center of an outer shell 2 made of FRP and has a circular cross section from the head sole surface 1a side to the upper surface side. A face plate 4 made of hardened FRP with carbon fiber as a reinforcing fiber is embedded in the FRP outer shell 2, while a sole plate 5 closes the lower opening of the hollow portion 3 in the sole surface 1a. It is installed like this.

That is, in order to manufacture the above-mentioned club head according to the present invention, as shown in FIGS. 2 and 3, a cavity 13 having an outer shape of the head is formed by forming molds 11 and 12 consisting of a pair of left and right split molds.
Cylindrical FRP made of highly rigid metal material etc.
A state in which the mouth portion 14a of the feeding tube 14 for green material for molding is inserted from the portion corresponding to the head sole side, and the base portion 14b side of the feeding tube 14 is projected outside by the clamping action of the molds 11 and 12. Clamp and fix it so that it does not shift in the front-rear direction and left-right direction (see Figure 2). In this case, it is best to arrange the feeding tube so that its central axis and face surface are parallel to each other in order to mold the golf club, and the mouth of the feeding tube should be placed deeper than the center of the mold. By inserting the
It is preferable to allow the mold to face sufficiently deep from the mouth of the mold.

At this time, an air vent hole 15 communicating with the cavity 13 is formed around the base 14b of the feeding tube 14 which is clamped and fixed between the molds 11 and 12 (note that this air vent hole 15 is not set in particular). The base 14b of the feeding tube 14 and the molds 11, 12
), and if necessary, the forming molds 11 and 12
There is a hardened material in the cavity 13 of the part corresponding to the ball hitting surface, back surface, or sole surface of the head.
A plate material for the head surface such as a face made of an FRP plate or semi-hardened SMC, a weight adjustment member, a head reinforcing material, etc. are placed in a temporarily fixed state, and in this state, the feeding tube 14 is used as a cylinder and its base is A raw material 17 for FRP molding made of BMC or SMC is fed into the cavity 13 of the molds 11 and 12 with the mouth 14a side of the feeding tube 14 open by the pushing action of the piston body 16 from inside the 14b side, Then, the air in the cavity 13 is filled while being discharged from the air vent hole 15, and hardening and molding is performed (see FIG. 3).

Furthermore, as a method for positioning the weight adjustment member or head reinforcing material, the weight adjustment member 20 is made of a metal such as lead or is made of hardened FRP or the like and has a shape such as an annular or a plate with a circular hole. By fitting the head reinforcing material into the feeding tube 14 in advance and fixing it in the mold, and feeding the raw material for FRP molding into the mold, stable positioning is possible and highly accurate fixing is possible. Each member can be inserted into the head at any position and can be integrally molded (see FIG. 4).

After molding, the feeding tube 14 is inserted into the mold 1.
After removing the molded product by pulling it out and releasing it from the mold, and placing a filler in the opening of the molded product as necessary, the sole plate etc. are attached to form a club head as shown in Fig. 1. It's something you get.

According to the above-mentioned manufacturing means according to the present invention, the mouth portion 14 of the cylindrical raw material for FRP molding is placed in the cavity 13 of the molds 11 and 12.
4a facing and clamped and fixed by the mold clamping action of the molds 11 and 12 for positioning, and the feeding cylinder 1
Since the raw material 17 for FRP molding is fed into the cavities 13 of the molds 11 and 12 from the mouth portion 14a of the feed tube 14, the mouth portion 14a of the feeding tube 14 is always connected to the cavities 13 of the molds 11 and 12. 13, the pressure when feeding the raw material 17 for FRP molding does not directly act on the feeding cylinder 14, and the feeding cylinder can be stably positioned between the two. When,
If the feeding direction is bent in a direction perpendicular to the axial direction of the feeding tube 14 so that the mouth 14a of the feeding tube 14 faces the inner wall surface of the cavity corresponding to the ball hitting surface of the head, FRP forming can be achieved. It becomes possible to more reliably prevent displacement of the feeding tube 14 due to pressure during feeding of green material.

The raw materials for FRP molding used in this invention include, for example, epoxy resin liquid with a length of 12 to 50 mm, such as 13 mm or 25 mm.
A mixture of chopped strands of mm in a ratio of 30:70 to 60:40, for example 50:50 (amount of resin: amount of fiber) is used. In addition, the specific molding conditions for the head body include, for example, when the gap between the gaps formed in the mold is 2.5 mm, the feeding pressure of the raw material for FRP molding is 50 kg/cm ^{2, and the pressure of the resin feeding tube is 50 kg/cm 2} . The diameter of the mouth
20mm, and the curing conditions are set at 100°C and 20 minutes. Under these settings, the resin feeding tube should be pulled out and removed after the raw material for FRP molding has completely cured, or after the material has been partially cured to the extent that it can retain its shape. It is preferable to set it after curing.

In this invention, the hollow part of the feeding tube formed in the molded product by pulling out and removing after molding was left as it is, but this hollow part was filled with foamed synthetic material mainly for the purpose of adjusting the tone when hitting the ball. It may be filled with resin or a weight member may be buried as necessary.

〔Effect of the invention〕

As is clear from the above explanation, this invention
A feeding cylinder is inserted and held in the mold, and the raw material for FRP molding is fed into the mold through this feeding cylinder and is cured and molded, and the material is hardened on the part corresponding to the ball hitting surface of the head in the mold. Since the FRP board is temporarily fixed in advance, the head is formed by hardening the FRP molding raw material by feeding it into the mold and curing the hardened FRP board and the FRP molding raw material. The ball can be completely integrated with the product, and the strength of the ball hitting surface can be improved.

In addition, since the cured FRP board is cured and molded into a plate shape separately outside the mold, it is possible to apply high temperature and pressure during molding, and the fiber alignment and resin impregnation are sufficient, resulting in high density and high quality. can be obtained, and the aesthetic appearance can be improved.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a main part showing an embodiment of a wood club head for golf according to the present invention, and FIGS. 2 to 4 are explanatory views showing the manufacturing process. 11, 12...Mold, 13...Cavity, 14
...Feeding cylinder, 14a... Mouth part, 16... Piston body, 1
7... Raw material for FRP molding, 20... Weight adjustment member.

Claims (1)

[Scope of Claims] 1. A feeding cylinder is inserted and held in the mold, and the raw material for FRP molding is fed into the mold through the feeding cylinder, and is cured and molded. A method for manufacturing a wood club head for golf, characterized in that a hardened FRP plate is temporarily fixed in advance to a portion of the head corresponding to the ball-hitting surface. 2. The method for manufacturing a wood club head for golf according to claim 1, wherein a semi-hardened sheet-like FRP raw material for molding is placed in advance in a portion of the mold corresponding to the ball-hitting surface of the head. 3. The method of manufacturing a wood club head for golf according to claim 1, characterized in that a weight adjustment member is temporarily fixed in advance to a portion corresponding to the center portion of the head or the rear portion of the head within the mold. 4. The wood club head for golf according to any one of claims 1 to 3, wherein the feeding cylinder is arranged parallel to a portion corresponding to the ball hitting surface of the head in the mold. manufacturing method. 5. The method for manufacturing a wood club head for golf according to any one of claims 1 to 4, characterized in that a weight adjustment member is fitted and disposed in the feeding tube. 6. The golf wood club head according to any one of claims 1 to 5, wherein the mouth of the feeding cylinder is inserted deeper than the center of the mold. manufacturing method.