JPS622976A - Production of golf club head - 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] [Industrial Application Field] The present invention relates to a method for manufacturing a golf club head, and more particularly to a novel method for manufacturing a core of a wood golf club head. be.

[Prior art]

Traditionally, wood clubs have been made by processing wood such as persimmon wood (such as versimmon) into a predetermined shape to form a solid head, but recently, clubs manufactured using wire-reinforced plastic as the main material have been manufactured.・A head is being developed.

This type of club head has a long history of being molded into a shape similar to club heads made from materials such as Versimmon, so the weight is increased: l A foamed synthetic resin with a light specific gravity is used as the core, or it is adjusted by making it hollow. doing.

However, in the case of a club with a hollow structure...
Recently, club heads with a structure using a core have been commonly used in order to worsen the ball flight distance and feel at impact, which are important characteristics required for golf clubs.

By the way, most of the cores used in this type of club head are made of foamable synthetic resin material that is molded or injection-foamed, and clubs that use this material are
Heso L- is molded by molding the core in advance with foamable synthetic resin +A and then integrally molding it with the club head body, or by molding the outer shell of the club head first and then foaming it. A method of filling a synthetic resin composition and foaming and curing it (Japanese Patent Publication No. 5, No. 21436) is known.

However, the commonly used hard urethane foam and other low specific gravity foamed synthetic resin materials have low compressive strength and impact fracture strength, making it difficult to withstand long-term harsh conditions of use as wood golf clubs, and furthermore, they have poor strength and impact resilience. Because of its inferiority, there were also problems with ball flight distance and feel when hitting.

In order to solve the above-mentioned problems with wood golf clubs, the applicant has already proposed a wood club head with a syntactic foam core that has low specific gravity and extremely high compressive strength. There is (Unexamined Japanese Patent Publication No. 6)
0-68873).

The core of the syntactic foam used for this can be created by making a block material in advance and processing the core from this, or
Alternatively, a method is used in which the core is pre-molded by reaction hardening using mold molding, but in this method, the surface force of the core is 1■, so the flow of the fiber-reinforced plastic is disturbed during molding, and the core is hardened. The clamping force applied to each part of the body tends to be uneven. Furthermore, the degree of freedom in designing the composition of the syntactic foam composition is reduced due to the need to have sufficient strength to withstand the pressure during head molding.
Application of syntactic foams of lower specific gravity was difficult.

In addition, the number of processes using a mold for pre-forming the core body increased, and additional equipment was required. Furthermore, the core may move slightly when the head is integrally molded, so it was necessary to design the core to be smaller for safety reasons in order to ensure the thickness of the outer shell made of fiber-reinforced plastic.

[Purpose of the invention]

The present invention was devised in view of these conventional problems, and its purpose is to solve the conventional problems in manufacturing club heads made of fiber-reinforced plastics, and to improve the life of golf clubs. To provide a method for manufacturing a golf club head that can satisfy certain golf ball flight distance and feeling when hitting.

[Structure of the invention]

In order to achieve the above object, the present invention injects a paste-like uncured sink foam composition into the hollow interior of a core outer shell that is pre-formed into a certain shape using a thermoplastic resin or thermosetting resin as a main material. After that, the syntactic foam composition is reacted and cured to form it integrally with the outer shell of the core, and the head core thus formed is placed inside a head mainly made of fiber-reinforced plastic. The gist is to bury it and mold it integrally.

[Embodiments of the invention]

Hereinafter, the present invention will be described in detail based on the accompanying drawings.

FIG. 1 is an overall perspective view of a wood club head body manufactured according to the present invention, and FIG. 2 is a longitudinal sectional view taken along the line ■-■ in FIG. A head outer shell 2 mainly made of plastic, and a core outer shell 3 filled with a syntactic foam composition as a core material Q.
The core body 4 is made of a thermoplastic resin, a thermosetting resin, or a fiber-reinforced plastic made by reinforcing these materials with fibers, and a sole plate 5 constitutes the bottom of the core body 4.

As shown in FIG. 3, the method for manufacturing the core outer shell 3 is to mold the core outer shell 3 into an upper part 3a and a lower part 3b by injection molding with nylon resin. The hollow part 6 of this core outer shell 3 is filled with an uncured syntactic foam composition, and the joint part 3C between the upper part 3a and the lower part 3b of the outer shell is joined mechanically or by adhesive, welding, etc. Seal and form.

An example of a syntactic foam composition is N, N
, N', N'-tetraglycidyl metaco-1-SiI/NdiaminediI'L'Tl;' 1-X:TMitsubishi Gas Chemical) 31.7 parts, methyl bimix acid anhydride (
11th Kasei! ! ', 68.3 parts by weight, glass micro hollow sphere (Δ161500: manufactured by Three'T-1) 28.
7 parts by weight) were uniformly mixed using a W stirrer to obtain a paste composition.

The core body 4 filled with this syntactic frame &:ll acid was heated at 150°C [for 50 minutes in a gear oven to react and harden the core) A (foam (, ()
and embody it. .

Furthermore, this was pre-impregnated with vinyl ester resin in a club heno 1zeta pressure 11h molding mold, and then the PAN system] 1
SMC (Sea 1-
A club head as shown in FIGS. 1 and 2 was made by integrally molding the molding compound with Sorp 1 No. 15.

In addition, the syntactic four J, &+1 composition always contains /
A crystal hardening type can also be applied, and the plastic used for the core outer shell 3 may be any material as long as it can withstand the heating temperature and molding temperature.

Club molded as above...＼Soto 1 to Uno I...
A golf club called a club? When I tested it, I found that it was the same as when the core 4 was molded only with the syntactic four 1.
Compared to a golf club head using a core made of Notanhumeme, a flight distance of 6% or more was observed, and the feel at the time of hitting was also good.

In the manufacture of the wood club head according to the present invention, the head shell 2 is not limited to the compression molding method, but injection molding can also be used. - It is not limited to molding compound (SMC), but bulk molding compound (BMC), prepreg, or a combination thereof can also be used, and molding by hand layup or filament winding can also be used.

Further, it is also possible to cure the syntactic four J composition used for the core at the same time as club head molding.

FIG. 4 shows another embodiment of the present invention, in which a hackway l-W is inserted into the lower part of the core body 4 and integrally formed when the club head body 1 is manufactured. .

The other configurations and manufacturing methods are the same as those of the first embodiment, so the same reference numerals (=t) are given and the explanations are omitted.

〔Effect of the invention〕

This invention, as described in the above, is characterized in that a paste-like uncured syntactic foam composition is filled into the hollow interior of a core outer shell that is pre-formed into a certain shape using thermoplastic resin or thermosetting resin as the main material. After that, the syntactic foam N is molded integrally with the outer shell of the core by reaction-curing the acid, and the head core formed in this way is made into a head mainly made of fiber-reinforced plastic. Since it is embedded inside and integrally molded, it has the following excellent effects.

(1) In order to pre-form the outer shell of the core body using thermoplastic resin or thermosetting resin as the main 4A material? The accuracy of the outer shape of the core body having a Jtifft curved surface has been improved, and the outer shell of the head can be molded to have a uniform wall thickness.Furthermore, the wall thickness can be made thinner, and the weight of the helenoid 1 can be reduced.

(2) The processing process of molding the core body with a mold and curing it by heating reaction is eliminated, eliminating the need for equipment such as molds, and improving production efficiency.

(3) By giving the core outer shell considerable strength,
It has become possible to use a syntactic foam composition with lower specific gravity and lower compressive strength, making it easier to reduce the weight of the heno 1ξ.

(4) It has become easier to push in weights such as lead for the purpose of adjusting the weight of the head and the position of the center of gravity.

(5) The accuracy of inserting the anchor pin into the core to prevent the core from shifting during molding was improved.

(6) SMC during head molding because the core surface is smooth
(Sheet molding compound) flows smoothly and clamping force is applied uniformly to the entire core.

[Brief explanation of the drawing]

Fig. 1 is an overall perspective view of a wood club head embodying the present invention, Fig. 2 is a vertical sectional view taken along the line FIG. 4 is a cross-sectional view showing another embodiment of the wood club head. 1...Club head body, 2...Head outer shell, 3
... Core body outer shell, 4... Head core body, Q... Core material (
syntactic foam composition).

Claims (1)

[Claims] A paste-like uncured syntactic foam composition is filled into the hollow interior of a core outer shell that is pre-formed into a certain shape using a thermoplastic resin or thermosetting resin as the main material,
Thereafter, the syntactic foam composition is reacted and cured to be molded integrally with the core outer shell, and the head core thus molded is embedded inside a head mainly made of fiber-reinforced plastic. A method for manufacturing a golf club head characterized by integrally molding the head.