JPS63139572A - Production of 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 [Purpose of the Invention (Industrial Application Field) This invention relates to a golf club head, such as a wood club head, having an outer shell made of fiber reinforced plastics (hereinafter abbreviated as FRP). Concerning the manufacturing method.

(Prior Art) Conventionally, in manufacturing this type of golf club head, for example, a wood club head, fibers about 1 inch long were impregnated with an uncured thermosetting synthetic resin liquid and semi-cured. A method of molding an FRP molding material into a desired club head shape by transfer molding means, or a method in which a core component is inserted into a cavity in a mold in advance, and the inner circumferential wall surface of the cavity of this mold and the core component are A method of forming a head molded body by forming a gap between the AB
A method in which a head molded body can be molded by injection molding raw material for molding by kneading short fibers made of relatively short carbon fibers into a thermoplastic synthetic resin liquid such as S resin or polycarbonate resin, etc. is proposed.

(Problems to be Solved by the Invention) However, the above-mentioned conventional head forming means, that is,
Transfer molding means is simpler, but on the other hand,
Since the reinforcing fibers are short fibers, special consideration was required in designing the head body in terms of its strength.

In addition, the method for manufacturing a club head using the injection molding method described above is as follows:
The combination of a thermoplastic synthetic resin liquid and short fibers is the simplest manufacturing method, but it has the problem of being the worst 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 method for manufacturing a golf club head that can improve the strength of the outer shell skin portion of the head after molding.

[Structure of the invention] (Means for solving problems) This invention aims to solve the above-mentioned problems.

A process of penetrating and supporting the mouth of the feed cylinder of the raw material for FRP outer shell molding fed into the cavity of the molding die through the head core component material, and inserting long fiber cloth around the head core component material. A step of encapsulating the fiber material for forming the head skin, and inserting the head core component material covered with the fiber material for forming the head skin into the cavity of the mold with a predetermined gap, and positioning and fixing.

At the same time, the feeding tube is exposed to the outside of the mold, and the head skin forming fiber material is pressed against the inner wall surface of the cavity of the mold through the feeding tube into the gap. This method is characterized by the steps of feeding raw material for forming the outer shell and curing and forming the head outer shell molded body.

Also, during the process according to the invention described above.

It is also possible to eliminate the use of the head core component material and directly wrap the long fiber cloth around the opening of the feeding tube of the raw material for molding the FRP outer shell and mold it.

(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 cylinder for raw material for forming an FRP outer shell is penetrated and supported in advance. At the same time, the core component is inserted, positioned and fixed, and a head skin forming fibrous material made of long fiber cloth is previously wrapped around the core component and F is placed in the cavity gap in the mold.
Since the raw material for forming the RP outer shell is fed, it is possible to avoid the influence on the core component material due to the feeding pressure when feeding the raw material for forming the FRP outer shell, and
Due to the feeding pressure of the raw material for forming the outer shell, the fibrous material for forming the head skin is pressed against the inner wall surface of the mold cavity, and as a result, after hardening and molding, the material undergoes the largest deformation strain due to the impact when hitting the ball. Since it is possible to form an FRP skin layer in which a fiber reinforcing material made of long fiber cloth is interwoven in the head outer shell skin portion, it is possible to dramatically increase the strength and performance of the head outer shell.

(Embodiments) 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. The head body 1 is formed of an outer shell 2 made of FRP and a hollow core 3, and the surface side of the head outer shell 2 is made of long fiber cloth such as carbon fiber or polyaramid fiber. A skin layer 21 in which reinforcing fibers are interwoven is integrally formed, and 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 has a protrusion 4a that is fitted to cover a hole 2a that is opened on the head sole surface 1a side of the head outer shell 2 when the hollow core 3 of the head body 1 is molded. ing. Reference numeral 5 in FIG. 1 denotes a face plate made of hardened FRP or ceramics using carbon fiber as reinforcing fibers, which is embedded in the FRP outer shell 2 of the ball hitting surface 1b of the head body 1.

Reference numeral 6 designates a back weight member made of a metal material such as brass provided on the back surface 1c of the head main body 1, and further, 7 a shaft inserted and fixed into the neck surface 1d of the head main body 1.

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 constituent material 11 having a shape that approximates the shape of the head core is made of a low melting point alloy that can be eluted. Molded separately.

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 made of a metal material or the like is inserted into the holding hole 12. Tip opening portion 13 of feeding cylinder 13 for feeding raw material for molding
By inserting the core member 11 into the feeding tube 13, the core member 11 is held in place so as not to be displaced, and a sleeve made of long fiber cloth is placed around the core member 11. The fiber material for forming the head skin, which is made up of the material 14 and the cloth material 15, is wrapped in double layers with a margin (
(See Figure 2).

Next, such head core molding material is inserted into a mold 16.17 consisting of a pair of left and right split molds, and a cavity 18 is formed by clamping these molds 16.17.
The base 13 of the feeding tube 13 is inserted into the mold hole 19 passing through the direction.
While clamping and fixing with the b side protruding outside,
The outer circumferential surface of the core component 11 and the cavity 18 of the mold 16 and 17, around which the fiber material for forming the head skin consisting of the sleeve material 14 and the cloth material 15 is double-covered with a margin. It is positioned and fixed so that a gap A corresponding to the thickness distribution of the head outer shell is formed between it and the inner circumferential wall surface 18a (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 in the mold hole 19 of the mold 16, 17. 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. A face plate made of hardened FRP, ceramics, etc., and a weight member, etc., as needed, are temporarily placed on a portion corresponding to the ball hitting surface, back surface, or sole surface of the head 17.

In this state, using the feed tube 13 of the raw material for FRP molding protruding from the outside of the mold 16.17 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
Alternatively, the raw material 3o for forming an FRP outer shell made of SMC such as a prepreg sheet with reinforcing fibers oriented in a single direction is directed into the gap A in the mold 16.17 through the tip opening 13a of the feeding tube 13. (See Figure 4). At this time, a sleeve material 14 and a cloth material 1, which are long fiber cloths, are double-wrapped with a margin around the core component material 11.
The head skin forming fiber material consisting of 5 is pressed against the inner wall surface 18a side of the cavity 18 of the mold 16.17 by the feeding pressure of the raw material for forming the FRP outer shell, so that it can be arranged. ing. Also, the air within the gap A is.

At the same time as the raw material 30 for forming the FRP outer shell is fed, it is discharged from the air vent hole (not shown), whereby the FRP
This makes it easy to uniformly fill the raw material 30 for forming the outer shell into the void A, and by performing hardening and forming in this state, the head skin is formed on the surface side of the head outer shell formed body 40 after hardening and forming. A layer 41 is formed thereon.

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 form the head outer shell molded body 40.
is heated in its entirety to melt the core component 11 and remove the feed tube 13 from the mold 16.17, at the same time eluting it out from the mold hole 19 (see FIG. 5).

Furthermore, after the above-mentioned core constituent material 11 is melted, 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 4o, and this sole plate By covering the core constituent material elution hole 40a formed in the portion corresponding to the sole surface of the head outer shell molded body 40 with the protrusion 4a protruding from the head shell molded body 40 (see FIG. 6), as shown in FIG. This produces a head molded product like this.

According to the above-mentioned manufacturing means according to the present invention,
The tip opening portion 13a of the cylindrical feeding tube 13 for green material for FRP molding is exposed inside the mold 16.17.

The core component 11 is supported in a penetrating state on the outer circumferential side of the tip 13a, and head skin forming fibers consisting of a sleeve material 14 and a cloth material 15 are arranged around the core component 11 as long fiber cloths. After the material is encapsulated, the feeding cylinder 13 is positioned by the fixing means of the feeding cylinder 13 held in the mold hole 19 by the mold clamping action of the mold 16, 17, and thereby the mold 1
6. The green material for forming the FRP outer shell is passed through the feed cylinder 13 into the gap A for forming the head outer shell formed between the inner peripheral wall surface 18a of the cavity 18 and the outer peripheral surface of the core component 11 in 17. 30, the opening of the tip opening 13a of the feeding tube 13 always faces the inner peripheral wall surface of the mold 16, 17, and the raw material for molding the FRP outer shell is fed. Since the pressure at the time of entry 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 molding the FRP outer shell uses a combination of carbon fiber, glass fiber, or polyaramid fiber as reinforcing fibers, and is made of a cloth of these fibers or a unidirectional bundle of fibers with a length of 20 to 50 mm. is impregnated with a non-foaming or foaming thermosetting or thermoplastic uncured liquid synthetic resin as a matrix liquid synthetic resin,
It is semi-cured and cut. In particular, when a thermoplastic uncured liquid synthetic resin is used as the matrix liquid synthetic resin, the reinforcing fibers are impregnated with a thermosetting uncured liquid synthetic resin in advance. It's better to leave it alone.

Further, as the long fiber cloth as the fiber material for forming the head skin, carbon fiber or polyaramid fiber is preferably used, and in this case, the raw material 30 for molding the FRP outer shell is used as the liquid synthetic resin for the matrix. When using a foamable uncured liquid synthetic resin, the fiber material for forming the head skin should be impregnated with a thermosetting uncured liquid synthetic resin in advance, rather than using the fiber material for forming the head skin in an unimpregnated state. It is better to use prepared prepreg. Furthermore, when wrapping the fibrous material for forming the head skin around the core component 11, various weight members etc. are inserted in advance between the fibrous material for forming the head skin and the core component 11. Each is packed and placed as necessary, and this results in
It is also possible to attach it integrally at the same time as molding the head outer shell molded body 4o.

Furthermore, in order to elute and remove the core constituent material 11 after molding the head shell molded body 40, a mold hole may be opened in a corresponding portion of the back portion 1c in addition to the sole portion 1a as in the above embodiment. Alternatively, it is also possible to elute and remove using the shaft insertion hole.

[Effects of the Invention] As is clear from the above description, according to the present invention, a predetermined gap is provided around the cavity in the mold, and the FR
The opening of the feeding tube for raw material for forming the P outer shell is inserted into the core component, which is supported through the core component, and is positioned and fixed. At the same time, the head skin forming fiber made of long fiber cloth is placed around the core component. The material is encapsulated in advance and FRP is placed in the cavity space in the mold.
9+ Since it is made into raw material for main molding for shell molding,
It is possible to avoid the influence on the core component material due to the force when feeding the raw material for main molding of FRP9+ shell molding.

The feeding pressure of the raw material for forming the FRP outer shell presses the fiber material for forming the head skin against the inner wall surface of the mold cavity. Since it is possible to form an FRP skin layer in which fiber reinforcing material made of long fiber cloth is intermixed on the large head outer shell skin part, the strength and performance of the head outer shell can be dramatically improved. Therefore, it is possible to provide a method for manufacturing a golf club head that exhibits the following effects.

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 the opening of the tube is covered and molded.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a main part showing an embodiment of a club head manufactured by the golf club head manufacturing method according to the present invention. FIGS. 2 to 6 are explanatory diagrams showing the manufacturing process. DESCRIPTION OF SYMBOLS 11... Core constituent material, 13... Feeding cylinder, 13a... Tip opening part, 14
．． 15...Fiber material for forming head skin. 16.17... Molding mold, 18... Cavity, 18a... Inner peripheral wall surface, 3
0... Raw material for FRP outer shell molding, 40... Head outer shell molded body. A...Void. Figure 2 Figure 3 Figure 4

Claims (4)

[Claims] (1) A step of enclosing a head skin-forming fibrous material made of long fiber cloth around the mouth of the feed tube of the raw material for FRP outer shell molding that is fed into the cavity of the mold, and the above-mentioned molding. A step of inserting, positioning and fixing a feeding tube encapsulated with a fiber material for head skin formation into a cavity of the mold, and exposing the feeding tube to the outside of the mold; A method for manufacturing a golf club head comprising the steps of feeding raw material for shell molding and curing and molding a head outer shell molding. (2) Scope of Claims In the method for manufacturing a golf club head as set forth in item 1, the opening of the feed cylinder of the raw material for molding the FRP outer shell to be fed into the cavity of the mold is pre-adjusted to the head. A head skin-forming fibrous material made of long fiber cloth is encapsulated around the head core component, and the cavity of the mold and the head skin-forming fibrous material are encapsulated. A manufacturing method characterized by feeding raw material for forming an FRP outer shell through the feeding cylinder into the gap between the head core component and the formed head core component material. (3) Scope of Claims In the method for manufacturing a golf club head according to either claim 1 or 2, the head skin-forming fibrous material wrapped around the core component material includes: A manufacturing method characterized by pre-impregnating an uncured liquid thermosetting synthetic resin. (4) In the method for manufacturing a golf club head according to claim 2 or 3, the core component is used as a meltable core, and the head outer shell molded body is A manufacturing method characterized by elution and removal to the outside after hardening and molding.