JPH02180281A - Wooden golf club head and manufacture thereof - Google Patents

Abstract

PURPOSE:To reduce the thickness of the whole outer shell layer of a wooden head by integrally molding the thermoplastic resin, using the woven fabric, roving, blade, etc., consisting of the continuous fiber or the combination thereof as reinforcing fiber. CONSTITUTION:The fiber reinforced thermoplastic resin having the weight of the reinforcing fiber consisting of continuous fiber of 10-60wt.% is used. A wooden head 1 is formed through the integral molding by using the woven fabric, two-axis blade, three-axis blade, roving, etc., consisting of the continuous fiber such as carbon, glass, kevler, alumina, silicon carbide, and boron as the reinforcing fiber 8. A sole plate 2 or side metal 3 having an overhang-shaped projection 4 at one place or more is arranged integrally. Since the wooden head 1 has the integral molded structure through the reinforcement of the thermoplastic resin by the continuous fiber, the part which possesses the less rigidity and strength is integrally molded by using the continuous fiber as reinforcing fiber, utilizing the superior vibration absorbing performance and abrasion resistance which are the advantages of the thermoplastic resin.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to the structure of a golf wood club head (hereinafter abbreviated as "wood head") made of fiber-reinforced synthetic resin and a method for manufacturing the same.

(Prior art) Traditionally, wood heads made of TM fiber-reinforced resin have been manufactured by using continuous fiber fabrics, rovings, braids, etc., impregnated with a thermosetting resin. The shell molding material is placed in a mold with a head shape together with a core material made of a meltable material or a foamed synthetic resin, and the resin is hardened by pressure and heating to form a core material made of a meltable material. In some cases, the core material is melted and removed by heating after molding and molded into the desired head shape, and as seen in JP-A-58-212465, the core material is fixed in a mold for head molding. It is known that a fiber-reinforced synthetic resin is injected into a pressed mold and molded into a desired head shape.

(Problems to be Solved by the Invention) The wood head formed by the above conventional method has the following problems.

In other words, in the case of the former continuous fl If-reinforced thermosetting resin wood head, it is possible to make a strong and rigid wood head, but on the other hand, it is easy to break (and it cannot be said that the wear resistance is good, and When forming the wood head, the reinforcing fibers are disordered, leading to a decrease in strength, and there are many voids on the surface and inside, which makes post-processing time-consuming, and the strength is lower than the designed one. Ta.

In addition, regarding manufacturing, the process of molding the prepreg, laminating the prepreg onto the core material, and placing the molded resin material in the wood head-shaped mold is quite complicated and time-consuming, and the process of molding the prepreg with the mold is quite complicated and time-consuming. The molding cycle is relatively long, taking about 20 to 40 minutes at approximately 100°C to 150°C, and the reinforcing fibers are easily disturbed by the flow of resin during molding, and during that time, the temperature must be maintained at an appropriate temperature for molding. As a result, mass production required the use of multiple molds, resulting in high production costs.In addition, wood injection molded from synthetic resin reinforced with short fibers In the head, when thermoplastic resin is used as the synthetic resin, short fibers are used as a reinforcing material, so the strength and rigidity of the wood head is lower than that of a wood head using continuous R51 fibers. However, when manufacturing these wood heads, the molding pressure is high due to injection molding.
Therefore, molds and the like that are strong enough to withstand high pressure are required, which increases equipment costs.

(Means for Solving the Problems) In view of the above-mentioned conventional drawbacks, the present invention seeks to provide a wood head in which the arrangement of reinforcing fibers is formed in an optimal state in terms of strength and rigidity, and a method for manufacturing the same. It is.

The wood head of the present invention is made of a material capable of producing organic or inorganic continuous fibers and thermoplastic resin using reaction injection molding (REA).
CTION INJECTION MOLD I NG
=R1M molding method) A wood head that is integrally molded, and the reinforcing fibers are reinforced with continuous fibers, woven fabrics made of the continuous fibers, rovings, biaxial or triaxial braids, etc. The wood head is characterized in that the weight of the reinforcing fibers is 10 to 60% by weight. The method for manufacturing the wood head described above is to continuously fill a core material approximately in the shape of a wood head.
Reinforcement of woven fabrics, biaxial or triaxial braids, etc.
M fibers alone or a combination thereof are coated and wound to form a wood head material, and after the wood head material is placed in a wood head mold, a monomer capable of producing a thermoplastic resin that is a molding material is used. 2 such as prepolymers
A wood head molded body is formed by injecting the liquid raw material whose components have been adjusted into a closed mold and reacting within the mold. In addition, the core material is made of a meltable material, and after molding, the core material is heated to a temperature that melts it but does not melt or deform the molded object, and the core material can be removed and molded into a hollow shape. The hollow portion can also be filled with foamed synthetic resin.

Monomers or prepolymers of the molding material injected into the mold include caprolactam, laurolactam, polyol, isocyanate, etc., which have a low viscosity of 100 CPS or less, and are used around the resin in the mold and for reinforcement.
"Wetting" is good for if.

In addition, it is easy to mold without causing molding defects such as "slippage" of the fibers of the molded product and air bubbles. Bismuth, lead,
An alloy containing tin, cadmium, etc. as main components and having a melting temperature of 80°C or more and 200°C or less is used.

(Function) As mentioned above, the wood head is made of thermoplastic resin reinforced with continuous fibers and integrally molded, so it has good vibration absorption properties and excellent wear resistance, which are the advantages of thermoplastic resin. While taking advantage of this, the parts with poor rigidity and strength are improved by integrally molding continuous fibers as reinforcing fibers, resulting in a highly productive and durable wood head.

In addition, a wood head as designed can be obtained without any disturbance of reinforcement nI (ffi).In manufacturing the wood head of the present invention, unlike conventional injection molding, monomers, prepolymers, etc. with low viscosity are used in a mold. Because it is a reaction injection molding method in which continuous fibers are used as reinforcing fibers, the pressure inside the mold is low, and the resin can easily circulate between the reinforcing fibers, making it easy to impregnate and harden the mold. Easy to reach every corner of the molded product (improves the degree of completeness of the molded product).

(Example 1) An example of the present invention will be described with reference to the drawings. As shown in FIGS. 1 and 2, a wood head 1 is molded from a thermoplastic resin such as nylon or polyurethane by reaction injection molding. The reinforcing fibers 8 are integrally molded using a woven fabric made of continuous fibers such as carbon, glass, Kepler, alumina, silicon carbide, poron, etc., a biaxial braid, a triaxial braid, a roving, or the like. A sole plate 2 or side metal 3 having at least one overhanging protrusion 4 is integrally arranged.

(Example 2) In manufacturing the wood head of the present invention, biaxial and triaxial blades made of carbon and glass and reinforcing fibers 8 such as rovings and mats were melted at a melting temperature as shown in FIGS. 3 and 4. The reinforcing fibers 8 are superimposed on a core material 5 made of a molten alloy of about 150° C. and have a substantially wood head shape, so that the reinforcing fibers 8 are 10 to 60% by weight to form a wood head material 6 to be subjected to WI@turning. The head material 6 is placed in a metal mold 7 for forming a wood head. At this time, three-dimensional fabrics are placed on the reinforcing fibers in the area that corresponds to the face of the wood head, other reinforcing fibers are placed in a direction that improves the performance against torsion and repulsion of the entire head, and the sole plate and A side metal or other weight adjustment member is placed at the same time, the mold is closed, and two components, for example, liquid A consisting of caprolactam, a stabilizer, and a pigment, and liquid B consisting of caprolactam and a catalyst are placed in the closed mold. The adjusted material is injected, reacted and hardened in a mold, and molded.

(Effects) Since the present invention has the configuration and manufacturing method as described above, it has the following effects.

That is, the wood head of the present invention is integrally molded using reinforcing fibers made of thermoplastic resin, such as woven fabric made of continuous fibers, rovings, braids, etc., or a combination thereof. Since the wall thickness can be made thinner over the entire head, the degree of freedom in design, such as the weight distribution of the head, is improved.

In terms of strength and rigidity, the reinforcing fibers can be arranged in any direction as designed, and there is no disturbance of the fibers due to the flow of resin during molding, making it sufficiently durable for use as a wood head. Therefore, it is possible to provide a wood head that is highly durable, lightweight, and has a high degree of freedom in design.

According to the method for producing a wood head of the present invention, instead of mixing short fibers as reinforcing fibers into a dissolved resin and molding them using methods such as injection molding or transfer molding, the method uses a monomer prepolymer with a low viscosity. Since it is injected into the mold as a liquid raw material, it has good "wetting" with the TA fibers, allowing smooth impregnation into the I-fibers, and the molding pressure is low, so it reinforces woven fabrics, rovings, and braids made of continuous F TA IF. Even if the fibers are arranged as ta fibers,
There is no need to worry about this, and the strength, rigidity, etc. are improved, so the thickness of the outer shell of the wood head can be reduced to reduce weight, and there is a great advantage of freedom in structural design such as weight distribution of the head. In addition, the molding material can easily go around to every corner of the mold, making it easy to mold, allowing weight adjustment members, sole plates, side metals, etc. to be molded in one piece, and the surface condition after molding is good and aesthetically pleasing. Post-processing does not require much effort and can be manufactured at low cost.

[Brief explanation of the drawing]

1 to 4 show the wood head of the present invention and its manufacturing method, FIG. 1 is a perspective view of the wood head, FIG. 2 is a sectional view of the main part, and FIGS. It is an explanatory diagram. 1: Wood head, 2; Sole plate, 3: Side metal, 4; Protrusion, 5; Core material, 6; Wood head material, 7
; Mold; 8; Reinforced Ta fiber. ; Roofing Figure 1 Figure 2 Figure 4; Protrusion

Claims (1)

[Claims] 1. A golf wood club head molded from fiber-reinforced thermoplastic resin, the wood club head being integrally molded by reaction injection molding from a material capable of producing continuous fibers and thermoplastic resin. A golf wood club head made of a fiber-reinforced thermoplastic resin, wherein the weight of reinforcing fibers made of the continuous fibers is 10 to 60% by weight. 2. Form a core approximately in the shape of a wood club head, cover and wind reinforcing fibers such as woven fabric, mat, roving, or braid made of continuous fibers around the core to form a wood head material, and form the wood head material. After placing it in a mold for molding, a low-viscosity monomer or prepolymer capable of producing a thermoplastic resin is injected into the gap between the wood head material and the mold, impregnated with it, and reacted and solidified in the mold. A method for manufacturing a wood club head for golf made of thermoplastic resin, characterized by molding the wood club head. 3. In the method for manufacturing a wood club head, the viscosity of the low-viscosity monomer or prepolymer injected into the mold is 1.
3. The method for manufacturing a wood club head according to claim 2, wherein the wood club head has a hardness of 00 CPS or less. 4. In the method for manufacturing a wood club head, a core body approximately in the shape of a wood club head is formed from a meltable material, and after molding with a mold, the core body is melted and taken out to form a hollow wood club head. A method for manufacturing a golf wood club head made of fiber-reinforced thermoplastic resin according to claims 2 and 3.