JPH0793957B2 - Golf club head manufacturing method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for manufacturing a golf club head, and particularly to a head having a shape located between a wood and an iron, having a volume of 80 to 120 cm ³ and a weight of 220 to The present invention relates to a method for manufacturing a good golf club head by applying it to the one having 260 g.

[Conventional technology]

Golf clubs have a wood for flying the ball far away and an iron for surely selecting a short distance, but there is a difference between the wood and the iron in terms of shape, weight, etc. In addition to the need to do, there were parts that could not be aimed at in terms of flight distance. Therefore, in order to eliminate the gap between the wood and the iron, hollow club heads Nos. 1 to 11 were developed.

The golf club head that eliminates the gap between the wood and the iron is made of a hollow metal, so the feel is poor,
Moreover, although the weight is distributed around the periphery, there is a drawback that the center of gravity is high.

Therefore, a composite head of a fiber reinforced synthetic resin material (FRP) and a metal material as described in JP-A-58-212465 has been developed for a wood club. This forms a reinforcing layer of a fiber reinforced synthetic resin on a portion corresponding to the face surface and a portion corresponding to the upper surface, and the other portion is covered with an integrated metal outer shell reinforcing member having a substantially uniform thickness. And
Further, a reinforcing layer of a fiber reinforced synthetic resin having an arbitrary wall thickness and shape is formed between the head outer shell reinforcing member and the core material interposed inside the head outer shell reinforcing member and the fiber. The reinforcing layer of the reinforced synthetic resin and the core material are integrally molded. In addition, such a head is formed in a lower mold having a golf club head shape, matches the lower mold, is made of metal, and has a substantially uniform wall thickness. A head outer shell reinforcing member forming a substantially head shape is arranged by cutting out a corresponding portion, and a mandrel is inserted into the neck portion of the head outer shell reinforcing member, and a core material is provided in the head main body corresponding portion. Was placed and after the mandrel was inserted and bonded to the core material, the upper mold was placed, and then the upper and lower molds were clamped, and the head was provided at an arbitrary position corresponding to the face surface or the upper surface. It is obtained by injecting a fiber-reinforced synthetic resin through an injection injection port and integrally molding the head shape.

As another conventional example, the one described in Japanese Utility Model Laid-Open No. 59-5963 is known. This is because a hollow outer shell formed of fiber reinforced plastic and having an open bottom is filled with a substance having a specific gravity considerably smaller than that of the fiber reinforced plastic, and the open bottom of the outer shell is filled with the substance. It is closed by a sole plate formed of a metal having a larger specific gravity than the fiber reinforced plastic.

[Problems to be solved]

In the method described in JP-A-58-212465, a fiber-reinforced synthetic resin is injection molded to integrally mold a head. It is difficult to use long fibers as reinforcing fibers for injection molding, and short fibers have a drawback that it is difficult to obtain sufficient strength as a head to withstand impact when hit by a ball.

Further, Japanese Utility Model Publication No. 59-5963 discloses a golf club head using a substance having a small specific gravity as a core material, but the manufacturing method thereof is not particularly specified. In order to manufacture such a golf club head, generally, an outer shell portion having a hollow portion is first molded, then the hollow portion is filled with a foaming material, and further, a sole plate is attached, which requires a plurality of steps. did not become.

Therefore, the present invention includes an upper portion made of a synthetic resin material,
An object of the present invention is to provide a method capable of easily manufacturing a golf club head having a low center of gravity, which is excellently joined to a sole plate made of a metal material and has an excellent feel.

[Means for solving problems]

In order to achieve the above object, the present invention provides a method for manufacturing a golf club head in which a synthetic resin material and a metal material are integrally formed, in which a reinforcing fiber is provided around a core material made of a lightweight synthetic resin material having a specific gravity of 0.6 or less. A thermosetting synthetic resin material containing a synthetic resin member is prepared, and a metal material having a sole plate having a plurality of projections formed on its upper surface and a shaft connecting portion is provided in one of two divided molds. It is set in a cavity, the synthetic resin member is set on the sole plate so as to be inserted into the plurality of protrusions, and the two-piece mold is closed and heated and pressed.

[Action]

According to the method of the present invention, only one pressing step is required, and since the sole plate is integrated in the post-processing after molding, the cost can be reduced and the manufacturing cost can be reduced. Further, the manufactured head has a low center of gravity and a deeper center of gravity (becomes farther from the face surface), so that the ball easily goes up. According to the present invention, such a golf club head having a low center of gravity can be easily manufactured.

〔Example〕

Preferred embodiments of the present invention will be described below with reference to the drawings.

A golf club head 10 in which a synthetic resin material 1 and a metal material 2 are integrally formed. The metal material 2 constitutes at least a sole plate 11, and the synthetic resin material 1 constitutes a core material 12 and a head body portion 13, respectively. There is. As shown in FIG. 2, the metal material 2 has a plurality of protrusions at the center of the sole plate 11.
14 and also has a shaft connecting portion 15. The shaft connecting portion 15 is formed with a cylindrical groove 15A into which a shaft 22A of a movable die 22 described later is inserted. The synthetic resin material forming the core material 12 is a lightweight synthetic resin material having a specific gravity of 0.6 or less, and rigid polyurethane foam is preferably used. For example, as the core material 12, a polyol, which is a main component, and a polyisocyanate, which is a curing agent, are mixed at a predetermined ratio and poured into a mold having a predetermined shape to be molded. The synthetic resin material 1 forming the head main body 13 is a so-called SMC (sheet molding compound) in which reinforcing fibers are cut into about 1 inch and dispersed in a thermosetting resin such as vinyl ester resin or epoxy resin in a non-oriented manner. If necessary, a fibrous product impregnated with a resin is used together. Particularly, since the head main body 13 constitutes the face surface 13A, the face surface 13A is required to have high repulsion and high strength. The sole plate 11 is preferably made of a material such as stainless steel in order to withstand friction with the ground on the golf course. The reinforcing fibers mixed in the synthetic resin material 1 constituting the head main body 13 are preferably selected from carbon fibers, aramid fibers, and glass fibers cut into a length of about 1 inch. The synthetic resin material 1 forming the core material 12 increases the moment of inertia and improves the feel when hitting by allocating the space inside the head and distributing the weight in the periphery. The sole plate 11 is made to enhance the adhesive force of the synthetic resin material 1 when the synthetic resin material 1 is formed by painting and baking a primer after blasting and degreasing.

An example of means for integrally forming the synthetic resin material 1 and the metal material 2 will be described. As shown in FIG.
Movable mold 22 with upper mold 20 having cavities inside
And a lower mold 21 having a cavity for positioning the sole plate 11, the sole plate 11 subjected to a certain treatment is set in the lower mold 21, and the shaft 22A of the movable mold 22 is set in the cylindrical groove 15A. While inserting, set this on the lower mold 21 and S on the core 12.
After wrapping a certain amount of MC (specific gravity 1.3 to 1.8), further stack the required amount of SMC and, if necessary, the woven fiber-reinforced fiber impregnated with resin, and stack this on the protrusion 14. Set to insert. Then, by closing the upper mold 20 and the lower mold 21 and heating and pressurizing at 125 to 145 ° C. for 5 to 12 minutes,
The resin component of SMC is once softened, flows along the cavity shape of the mold, and is then cured and molded. According to such a molding means, the press molding process is performed only once, and since the sole plate 11 is integrated in the post processing after molding, the cost can be reduced, and the manufacturing cost is also low. Become.

〔effect〕

As described above, according to the present invention, in a method for manufacturing a golf club head in which a synthetic resin material and a metal material are integrally formed, a reinforcing fiber is provided around a core material made of a lightweight synthetic resin material having a specific gravity of 0.6 or less. A synthetic resin material portion in which a thermosetting synthetic resin material containing is arranged is produced, and a metal material having a sole plate having a plurality of projections formed on the upper surface and a shaft connecting portion is provided in one of two divided molds. Since it was set in the cavity, the synthetic resin member was set on the sole plate so as to be inserted into the plurality of protrusions, and the two-piece mold was closed and heat and pressure were applied. Since the sole plate 11 is integrated in terms of post-processing after molding, the cost can be reduced and the manufacturing cost can be reduced. Also, since the upper surface of the sole plate made of a metal material is provided with a plurality of protrusions, not only can the synthetic resin member be accurately and easily set on the sole plate, but also the sole plate and the upper part of the finished product. There is an advantage that the joining force with the main body is improved.

In addition, in the golf club head manufactured in this manner, the presence of the core material improves the feel on impact, and the head body made of a synthetic resin material mixed with long reinforcing fibers withstands impact when hit and has high resilience. The flight distance can be increased. Also,
Since the sole plate is made of a metal material, it has a high specific gravity to lower the center of gravity and helps prevent abrasion of the sole plate surface. A golf club equipped with a head manufactured according to the present invention was tested to hit a ball at a speed of 45 meters / sec. As a result, it was hit at various places on the face surface, and the durability against a total of 2000 shots was sufficient. There was found. Further, in the actual hitting test, a comparison was made with a club to which a metal head having the same shape was attached, but it was found that the head manufactured by the present invention had a higher launch angle, a lower center of gravity and a deeper effect. It was

[Brief description of drawings]

FIG. 1 is a sectional view of a head manufactured according to the present invention, FIG. 2 is a perspective view showing a metal material, and FIG. 3 is a perspective view showing an upper and lower molds as an example of molding means. 1 …… Synthetic resin material, 2 …… Metal material, 10 …… Head, 11 …… Sole plate, 12 …… Core material, 13 …… Head body, 14 …… Protrusion, 15 …… Shaft connection, 20 …… Upper mold, 21 …… Lower mold.

Claims (2)

[Claims] 1. A method of manufacturing a golf club head in which a synthetic resin material and a metal material are integrally formed, wherein a thermosetting synthetic material containing reinforcing fibers around a core material made of a lightweight synthetic resin material having a specific gravity of 0.6 or less. A synthetic resin member in which a resin material is arranged is produced, and a metal material having a sole plate having a plurality of protrusions formed on its upper surface and a shaft connecting portion is set in one cavity of a mold that is divided into two parts, A method for manufacturing a golf club head, wherein a resin member is set on the sole plate so as to be inserted into the plurality of protrusions, and the two-piece mold is closed and heated and pressed. 2. A thermosetting resin material is used as the synthetic resin material of the head body, and the reinforcing fiber is selected from carbon fiber, aramid fiber, and glass fiber cut to a length of about 1 inch. The golf club head manufacturing method according to claim 1, wherein the resin is dispersed in the resin in a non-oriented manner.