JPS58185179A - Production of wood 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 The present invention relates to a method for manufacturing a golf wood club head having an outer shell made of fiber reinforced plastics (hereinafter abbreviated as F'RP), and relates to a method for manufacturing a head of a golf wood club with an outer shell made of fiber reinforced plastics (hereinafter abbreviated as F'RP). By using long fibers and devising the molding means, moldability and processability are improved.

Generally, this type of wood club has a head body made of old wood such as Persimmon (persimmon tree) or maple that is processed into the desired shape, a face plate made of ABS resin or the like on the hitting surface, and a brass or other material on the noll surface and back surface. It is well known that the inertia is increased by providing a mass body such as a sole plate or a bank weight, which increases flight distance.

However, such conventional wood club heads have become expensive due to the soaring cost of materials due to the difficulty in obtaining raw wood, and the sophistication of processing technology due to the complexity of the shape.
Contrary to the increase in the golfing population, a decline in quality was inevitable.

Therefore, in view of the drawbacks of the so-called wooden club heads mentioned above, as disclosed in Japanese Patent Publication No. 51-21436, a club head made of an FRP outer shell structure in which the core of the head body is filled with foamed synthetic resin. Wood-type club heads have been developed, but as is well known, there are various difficulties in manufacturing them due to the complexity of the head shape, and the current situation is that they have not been put into practical use.
FRP' which forms the head body] Because the shell uses short glass fibers as reinforcing fibers, the fiber arrangement itself is random and lacks elastic modulus, which not only results in poor repulsion when hitting the ball, but also The reinforcing effect is also insufficient, the thickness of the outer shell layer must necessarily be increased, and the mold needle is inevitably oversized. Furthermore, with such a reinforcing structure of the FRP outer shell using short fibers, it is difficult to distribute the reinforcing fibers evenly over the entire circumference of the outer shell of the head body, and it is difficult to use cloaks, flat woven fabrics, etc. as reinforcing fibers. However, there were various drawbacks such as difficulty in adapting to the complicated curved shape peculiar to the head and poor followability in equalizing the fiber arrangement.

The purpose of this invention is to make it possible to put into practical use the manufacturing means of the prior art described above, and to enhance the reinforcing effect of the reinforcing fibers forming the FRP outer shell of the head body. The core mold that forms the core of the head body, and the FRP that forms the outer shell of the head.
Cover the molding thorns and place them in a mold having a desired external shape of the head, and perform hot-press molding by placing an appropriate head component part in a predetermined position together with the FRP molding thorns and molding. It is characterized by being integrated at the same time.

Hereinafter, this invention will be explained based on illustrated embodiments.
As shown in FIGS. 1 and 2, numeral 1 in the figures is a head main body obtained by a manufacturing method described later. The head body 1
It is formed of an FRP outer shell layer 2 and a core part 3 made of wood or foamed synthetic resin, etc., and a club/gift 4 is inserted and fixed into the base part 1a, and a hitting surface 1b.
A face plate 5 made of hardened, highly elastic F'RP or the like with reinforcing fibers made of ABS resin or carbon fiber is disposed on the sole surface 1c, and a sole face plate 6 made of thin plate metal such as brass is disposed on the sole surface 1c. A mass body such as a back weight 7 made of a metal material such as brass is embedded and fixed on the surface 1d side. 1, 8 in the figure is a plug for closing the insertion end side opening of the club shaft 4 which is inserted and fixed into the base 1a of the head body 1, and 9 in the figure is a plug that connects the head body base 1a and the club shaft 4. It is a protective body that protects the mounting part of the

That is, in order to manufacture the above-mentioned wood club head, as shown in FIGS. 3 to 6, a rod-shaped jig 10 (in the illustrated embodiment, a club/
The gift itself also directly serves as a rod-shaped jig; in this case, the protector 9 is inserted and fixed to the club/gift in advance), and a core mold 11 separately shaped in the shape of the core of the head body is inserted into the rod-shaped jig 10. is supported and fixed in such a state that the leading edge of the distal end portion 10a partially completely penetrates and protrudes toward the sole surface side, and
The entire circumferential surface of the core mold 11 including the outer circumferential surface and a portion corresponding to the base of the head body is covered with reinforcing fibers 12. This reinforcing fiber 12
It is knitted into a bag weave using appropriate combinations of carbon fiber, glass fiber, boron, silicon carbide, Kevlar, etc., and is made into a bag by closing one of its openings, and inside the bag. By inserting the core mold 11 and pulling the other mouth side, the bag can be brought into close contact with the circumferential surface of the core mold 1 with good followability. The reinforcing fibers 12 made of the bag are impregnated with a synthetic resin solution for 7 trixes such as ebony/resin or polyester resin (see Fig. 3), and at the same time, the face plate 5, sole plate 6, back weight 7 13.1.
4 (see FIGS. 4 and 5).

At this time, when positioning the core mold 11 in the cavity 16 of the mold 15, the split mold 13 due to the mold clamping action is
．． This is done by holding the tip end 10a of a rod-shaped jig 1° and the base of the extra edition of the protector with 14. After hot-pressing and releasing the mold, as shown in FIG. By sealing the incised opening, a love head as shown in FIGS. 1 and 2 is obtained.

By the way, the density of the reinforcing fibers knitted into a bag weave used in this invention is as follows: The type of sleeve is changed between the hosel part of the head body and the ball hitting part. l] 48 to maximum 96 strokes, or a minimum of 6 to a maximum of 50 sheets with a thickness of 0.3 mm are polymerized, and the type of reinforcing fiber that is twisted is 30% carbon fiber sleeve. More-1
Other sleeves made of Kevlar, glass fiber, or a combination of carbon fiber and glass fiber are also used. Furthermore, it is also possible to use other cloth such as glass fiber or Kevlar for the ball hitting part (face surface) of the head body, and in this case, the minimum thickness used is 0.
．． The range is from 2 layers to a maximum of 30 layers with 3 layers of cloth.

Furthermore, the total thickness of the FRP outer shell layer is set at 2 to 15 mm.

In the above embodiment, the core mold is made of wood or foamed synthetic resin, and the core mold is attached to the core of the head body.
However, the core mold is made of salt or polystyrene foam that can be melted with a solvent, metal or wax that can be melted by cutting or heating, and after the mold is released, it is discharged to the outside to form the head body. It is also possible to create a hollow structure with only an outer shell. As explained above, the present invention covers a core mold forming the core of the head body with an FRP molding material forming the outer shell of the head, and places the core mold in a mold having a desired outer shape of the head. In hot-press molding, appropriate head components are placed at predetermined positions along with the FRP molding material and integrated at the same time as molding, so head components such as the face plate, sole plate, or back weight are used. can be easily attached, further increasing the reinforcing effect, and reducing the overall weight by thinning the FRP outer shell, increasing the elastic modulus and repulsion force when hitting the ball. , which has excellent practical effects.

Figure 4 rfri (7) Simple jl” fr theory nJ] 1st t
"2+1d An explanatory view showing one embodiment of a wood-type club head for golf according to the present invention, FIG. 2 is a sectional view as well, and FIGS. 3 to 6 are explanatory views showing manufacturing states. 4゜1 Head body , 2-Ii'RP outer shell, 3
Core A, 4...Club 7
Yaft, 5/7-I-S surface IL 6
・ Sole face plate, 7 Back weight, 12 ・
Reinforcing fiber, 13.14.15 ・Mold,
16 Cavity 33 Patent Applicant ['' Hon Musical Instruments Manufacturing Co., Ltd. Procedural Amendment December 7, 1981 To the Commissioner of the Japan Patent Office, Patent Application No. 110472 of 1981 2 Title of Invention Process for Manufacturing Golf Wood Club Head 3 Amendment Relationship with the case filed by the applicant Applicant name (407) Nippon Gakki Mfg. Co., Ltd. 4 Agent address 1-1-5 Minami-Aoyama-chome, Minato-ku, Tokyo Date of amendment order (voluntary) (Shipment date) Showa year, month, day, 6 Amendment Full text of the subject specification 7, Specification of amendment 1, Name of the invention Method for manufacturing a golf wood club head! Claims (1) A core mold that forms the core of the head body is coated with an FRP molding material that forms the outer shell of the head, and the core mold is placed in a mold having a desired outer shape of the head, and then hot-press molded. A manufacturing method for a golf wood club head characterized by its shape and integration.

(2) The method for manufacturing a golf wood club head according to claim 1, wherein the face plate constituting the head component is made of FRP with carbon fiber as a reinforcing fiber.

3. Detailed Description of the Invention The present invention relates to a method for manufacturing a golf wood club head having an outer shell made of fiber-reinforced plastics (hereinafter abbreviated as 1-FRP). By using long fibers and devising the molding method, moldability and processability are improved.

In view of the drawbacks of conventional so-called wooden club heads, as disclosed in Japanese Patent Publication No. 51-21436,
A wood-type club head has been developed that has an FRP outer shell structure in which the core of the head body is filled with foamed synthetic resin, but as is well known, the complexity of the head shape poses various difficulties in its specific manufacture. Not only has it not been put into practical use at present, but also because the FRP outer shell that forms the head body uses short glass fibers as reinforcing fibers, the fiber arrangement itself is random and lacks elastic modulus. For this reason, not only is the repulsion force when hitting a ball inferior, but the reinforcing effect of the fibers is also insufficient, and the thickness of the outer shell layer must necessarily be increased, which inevitably increases the weight.

By the way, when normally hitting a ball, it is estimated that an impact of 5 to IQ tons is applied to the contact surface between the club head and the ball. In a club head with an FRP shell structure reinforced by fiber arrangement, the stiffness of the outer shell on the face is insufficient. It was difficult to increase the rigidity by selecting only one of these materials in FRP molding, and the workability was poor.

The purpose of this invention is to make the manufacturing means of the prior art described above practical, and to enhance the reinforcing effect of the FRP outer shell of the head body. A core mold forming the core of the head body is coated with an FRB molding material forming the head outer shell, and placed in a mold having a desired external shape of the head and hot-press molded. It is characterized in that a face plate made of a suitable hardened plate-shaped FRB is placed at a predetermined position along with the material and integrated at the same time as molding.

Hereinafter, this invention will be explained based on the embodiments of the drawings.
As shown in FIGS. 1 and 2, numeral 1 in the figures is a head main body obtained by a manufacturing method described later. The head body 1
is formed from an FRP outer shell layer 2 and a core material 3 made of wood or foamed synthetic resin, etc., and a club shaft 4 is inserted and fixed into its base 1a, and a striking surface 1b.
A face plate 5 made of hardened FRP using carbon fiber or glass fiber alone or in combination as a reinforcing fiber is provided on the sole surface IC, and a sole face plate 6 made of a thin plate metal such as brass is disposed on the sole surface IC. A mass body such as a pack weight 7 made of a metal material such as brass is embedded and fixed on the puncture surface ld side. 8 in the figure is a plug for sealing the insertion end side opening of the club shaft 4 which is inserted into and fixed to the base 1a of the head body 1, and 9 in the figure is a plug that connects the head body base 1a and the club shaft 4. It is a protective body that protects the mounting part of the

That is, in order to manufacture the above-mentioned wood club head, as shown in FIGS. In this case, the protector 9 is inserted and fixed to the club shaft in advance), and the core mold [1], which is separately shaped in the shape of the core of the head body, is attached to the tip part 10a of the rod-shaped jig [0]. The leading edge of the core mold 11 is supported and fixed in such a state that a part thereof completely penetrates and protrudes toward the sole surface side, and the entire peripheral surface including the outer peripheral surface of the core mold 11 and a portion corresponding to the base of the head body is covered with reinforcing fibers 12. do. This reinforcing fiber 1
2 is knitted into a bag weave using appropriate combinations of carpin fibers, glass fibers, boron fibers, silicon carbide fibers, Kevlar, etc., and preferably closes one opening to form a bag, and inside the bag. By putting the core mold 11 into the bag and pulling the other mouth side, the bag can be brought into close contact with the outer peripheral surface of the core mold 11 with good followability. Then, the reinforcing fibers 12 made of the bag are impregnated with a matrix synthetic resin liquid such as Epoquin resin or polyester resin (see FIG. 3), and at the same time, the face plate 5 and, if necessary, the sole plate 6. , pack weight 7 head components were arranged, and then these Jl and others were put into a pair of left and right split molds 13, 14 and 16 molds 1.
5 (see FIGS. 4 and 5) 1-1 (-, when
The positioning of the core mold 11 in the cavity 16 of the mold 15 is carried out by clamping the tip of the rod-shaped jig 10 [Oa] and the protector mounting base with the split mold 13.1.1 accompanying the mold clamping action. . Then, after performing hot-pressing molding treatment and releasing the mold, as shown in FIG.
4.) Cut and remove the tip 1-Oa of 7, and seal the cut opening 1'7. Finally, a love head as shown in FIGS. 1 and 2 is obtained.

By the way, the bag weave used in the invention of 1,
i The density of the reinforcing fibers is the same as the hosel part of the head body and the 4 layers 1
The divine nature of the sleeve changes with the ball part and 3 o o in one direction
o Fiber length: 6,000 fibers/bundle of yarn: minimum 48
A maximum of 96 bundles from a bundle, or a minimum of 6 to a maximum of 50 bundles of 7 sheets with a thickness of 0.3 mm are combined into one.
In addition, sleeves made of Kubun, Karasu fibers, or a combination of Chi-Pon and Ga 5x fibers are used. Furthermore, it is also possible to use other cloth such as glass fiber or Kevlar for the ball hitting part (face surface) of the head body. In this case, the minimum thickness used is two layers of cloth with a minimum thickness of 0.3rcnJ"4J. up to 3 from
The reinforcing method for this ball hitting part (face surface) is as follows:
It is attached to the outside or inside of the private layer of each molding material, but it can be placed by inserting it into the laminated layer as necessary, and
It is preferable to mold and harden the material and integrate it. Furthermore, the total thickness of the FRP outer shell layer is set to 10 to 15 mm.

In the above embodiment, the core mold is made of wood or foamed synthetic resin, and the core mold is attached to the core of the head body.
! , -1 remained, but by forming the core mold from, for example, salt or foamed polystyrene that can be melted with a solvent, metal or Fuchs that can be melted by heating, and discharging it to the outside after releasing the mold. The head body can also be formed into a hollow structure with only an outer shell. In addition, the manufacture of a single face plate made of cured FRP used in the present invention is performed by applying high temperature or high pressure and molding it, regardless of the temperature increase limit or pressure increase limit of other head constituent materials such as the core material. 17, and 2 can be obtained by selecting the arrangement state or type regardless of the fiber arrangement form of the reinforcing fibers in other FRP molding materials, so an FRP board with advanced characteristics can be obtained. It has the advantage of being able to obtain and.

As explained above, the present invention includes a core mold that forms the core of the head body, and an FRP molding wave control cover that forms the outer shell of the head, and is placed in a mold having a desired external shape of the head. During thermo-press molding, the face plate is placed at a predetermined position as a member constituting the head together with the FRP molding material and integrated at the same time as molding, which further enhances the reinforcing effect and improves the FRP outer shell. The overall weight can be reduced by making the wall thinner, and the elastic modulus and repulsion force at the time of hitting the ball can be increased, resulting in excellent practical effects.

4. Brief description of the drawings Fig. 1 is an explanatory diagram showing one embodiment of a wood-type club head for golf according to the present invention, Fig. 2 is a sectional view of the same, and Figs. 3 to 6 show the manufacturing state. It is an explanatory diagram.

1...Head body, 2...FRP outer shell, 3...Core material, 4...Club shaft, 5...Face plate , 6... Sole face plate, 7... Back weight, 12... Reinforcement fiber 13.14.15... Molding mold, ]6...・
·cavity.

Patent applicant: Nippon Musical Instruments Manufacturing Co., Ltd. -10-

Claims (2)

[Claims] (1) The core mold forming the core of the head body is coated with the FRP molding material forming the head outer shell, and placed in a mold having the desired outer shape of the head, and hot-press molded. A method for manufacturing a wood club head for golf, characterized in that a head component is placed in a predetermined position with an FRP molding material and integrated at the same time as molding. (2) In the method for manufacturing a golf wood club head as set forth in claim 1, the face plate constituting the head component is made of high elastic FRP reinforced with carbon fiber, and the other outer shell is made of carbon fiber. A manufacturing method characterized by using high-strength FRP made of reinforcing fibers mainly consisting of fibers. 1-