JPH01265980A - Manufacture of wood club head for golf - Google Patents

Abstract

PURPOSE:To install a weight member accurately by winding a raw material for FRP (fiberglass reinforced plastics) formation around a core material, gearing the supporting leg of a weight member to a core material holding hole, winding the raw material for FRP formation thereover, and placing it in a formation pattern to compress thermally. CONSTITUTION:At a specific position of a core material 11 where a weight member 31 is buried and fixed, a holding hole 12 is formed. As well as a raw material 21 for FRP formation to form a head shell is wound around the core material 11, a supporting leg 32 projected at the weight member 31 is geared to the holding hole 12 of the core material 11 penetrating the raw material 21. Furthermore, after winding a raw material 22 for FRP formation on the weight member 31, this material for head formation is arranged in a desired formation pattern 41 and a thermal compression is applied. As a result, the weight member buried and fixed to the head main body can be installed stably and accurately, and moreover, a damage of the formation pattern in the formation process can be prevented.

Description

[Detailed Description of the Invention] [Industrial Application Field] 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 FRP), in particular, In addition to stably and accurately attaching a weight member that is embedded and fixed to a mold, etc., the mold is prevented from being damaged during molding and is protected.

[Prior Art] Conventionally, in manufacturing this type of wood club head, for example, a green material for FRP molding is placed around a core material made of foamed synthetic resin. The material is impregnated with a cured synthetic resin liquid and semi-cured if necessary), then inserted into a mold having the shape of the outer periphery of the head, and then hot-press molded after the mold is clamped. It is obtained by

In particular, in order to embed and fix a weight member such as a back weight member in a predetermined position of the head body, for example, on the back surface, the raw material for FRP molding is wrapped around the core material, and at the same time, it is placed in the predetermined position. Currently, only the green material for FRP molding can be held by arranging weight members.

[Problems to be solved by the invention] However, with such conventional manufacturing means,
The weight member is wrapped around the core material and covered with FRP.
Since it is held only by the raw material for molding, the weight member tends to shift when inserted into the mold or during hot pressure after mold clamping, making the mounting position unstable and causing the center of gravity to be misaligned. Instead, the weight member becomes loose due to the impact when hitting the ball due to repeated use over a long period of time.

Further, as disclosed in Japanese Patent Application Laid-Open No. 57-175578, the back weight member is formed integrally with the sole member, and the projections protruding from the back weight member are inserted directly into the holes of the core material. After the main body with the weight member supported by the core material is placed in the mold, the gap between the mold and the main body is filled with raw material for FRP molding and heat-pressed to prevent the weight member from shifting. However, there is no FR between the core material and the weight member.
Is it possible to fill the raw material for P molding?

Otherwise, insufficient resin impregnation tends to occur, making the weight member installation unstable, and not only does the quality deteriorate.

Since the weight member comes into pressure contact with the inner wall surface of the mold during hot pressing, there is a problem that the inner wall surface of the mold is damaged and the life of the mold is shortened.

[Object of the Invention] The present invention has been made under the above circumstances, and its purpose is to stably and accurately attach a weight member that is embedded and fixed in the head body, and to provide a To provide a method for manufacturing a wood club head for golf that can prevent damage to a mold during processing.

[Means for Solving Problem A] In order to achieve the above-mentioned object, this invention forms a holding hole at a predetermined position of a core material in which a weight member is embedded and fixed, and a hole is formed around this core material. FRP forming the outer shell of the head
While wrapping the raw material for molding, this raw material for FRP molding is passed through and the support leg protruding from the weight member is fitted into the holding hole of the core material, and the raw material for FRP molding is further placed on top of this weight member. After winding the material, the head molding material is placed in a desired mold and hot-pressed.

[Function] In other words, the present invention has the above-mentioned structure, and the FRP is attached around the core material in which the holding hole is formed at a predetermined position.
A raw material for molding is wound around the raw material for FRP molding, and the support leg protruding from the weight member is fitted into the holding hole of the core material by passing through the raw material for FRP molding, and the raw material for FRP molding is further placed on top of this weight member. After being wrapped, it is placed in a desired mold and hot-pressed, so that the gap between the core material and the weight member is sufficiently filled with the raw material for FRP molding, and,
Since the support leg of the weight member is fitted by passing the raw material for FRP molding through the holding hole of the core material, the raw material for FRP molding is not stretched or flows due to the clamping action of the mold during hot pressing. The weight member does not move due to hardening phenomena, etc., and the weight member can be mounted stably and accurately with high precision.

In addition, during hot pressing, since the FRP molding raw material is interposed on the outside of the weight member, it is pressed against the inner wall of the mold as a cushion layer to protect it and prevent damage to the mold during molding. Ru.

[Embodiments] Hereinafter, the present invention will be explained in detail with reference to illustrated embodiments.

As shown in FIGS. 1 and 2, numeral 1 in FIG. 1 is a head body of a golf wood club according to the present invention manufactured by a manufacturing process described later. This head body 1 has a cross-sectional structure in which a core material 2 made of foamed synthetic resin is covered with an FRP outer shell 3, and a back weight member 4 is embedded in the FRP outer shell 3 corresponding to the back surface. Fixed.

The back weight member 4 is made of a metal material such as lead or brass and has a supporting leg 4a integrally formed in a protruding manner. It has a configuration in which it is fitted into the

Further, in the figure, numeral 5 denotes a face plate made of hardened FRP, etc., which is disposed on the face side of the head body 1, and 6 is a sole weight member, which is disposed on the sole side of the head body 1.

That is, in order to manufacture the above-mentioned wood club head according to the present invention, as shown in FIG. 3, a holding hole 12 is formed in advance in a portion corresponding to the back surface of a core material 11 made of foamed synthetic resin. Next, around this core material 11, a fourth
As shown in the figure, the first FR constituting the outer shell of the head body
The raw material 21 for P molding is attached so as to wrap around it.

Then, as shown in FIG. 5, the holding hole 1 of the core material 11 is
2, the supporting legs 32 protruding from the back weight member 31 are inserted and fitted while penetrating the first raw material 21 for FRP molding, and are temporarily held. As shown in FIG. 31 or around the entire circumference of the core material 11 including the back weight member 31.
1 is further wrapped so as to cover the head, and as shown in FIG. 7, such a head molding material is inserted into a cavity 42 in a mold 41 having a desired head outer peripheral shape and molded. It is made by tightening and hot-pressing.

By the way, the first and second FRP molding raw materials 21.
As the reinforcing fiber 22, a prepreg or an uncured liquid synthetic resin impregnated into multiple layers of reinforcing fibers is used. In particular, surface mat or reinforcing fiber of the second FRP molding raw material 22 of the outer layer is used. By using satin weave cloth alone or in combination with bag weave,
While improving surface smoothness and shape followability,
It is preferable to use matt or hollow weave carbon fibers as the reinforcing fibers of the first FRP molding raw material 21 of the inner layer so that the elastic modulus can be improved. Furthermore, the second FRP molding green material 22 is added to the core material 11.
When wrapping around the head body 1, the face plate 5 and the sole weight member 6 are placed simultaneously on corresponding portions of the face surface, sole surface, etc. of the head body 1, temporarily held, and inserted into the mold 41. It is also possible to

[Effects of the Invention] As is clear from the above description, according to the present invention, a holding hole is formed in a predetermined position of a core material in which a weight member is embedded and fixed, and a head outer shell is formed around this core material. At the same time, the raw material for FRP molding is passed through the raw material for FRP molding, and the support legs protruding from the weight member are fitted into the holding holes of the core material. After wrapping the raw material for molding, this head molding material is placed in a desired mold and hot-pressed. Therefore, FRP is used between the core material and the weight member.
It is possible to sufficiently fill the raw material for molding, and since the raw material for FRP molding is passed through the holding hole of the core material and the support leg of the weight member is fitted, the mold during hot press molding can be easily filled. The weight member does not move due to the tension of the raw material for FRP molding due to the mold clamping action or the flow hardening phenomenon, etc., and as a result, the weight member can be attached with high precision, stability, and accuracy. This can prevent the center of gravity from shifting and the occurrence of wobbling due to impact when hitting the ball.

In addition, since the FRP molding raw material is interposed on the outside of the weight member during hot pressing, it is pressed against the inner wall of the mold as a cushion layer to protect it and prevent damage to the mold during hot pressing. To provide a method for manufacturing a wood club head for golf that has an excellent effect of reliably preventing and protecting the head.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing one embodiment of a wood club head manufactured by the golf wood club head manufacturing method according to the present invention. FIG. 2 is an enlarged sectional view of the main part, and FIGS. 3 to 7 are explanatory views showing the manufacturing process. 11... Core material, 12... Holding hole, 21...
... Raw material for FRP molding, 22 ... Raw material for FRP molding, 31 ... Weight member (back weight member), 32
... Support leg part, 41 ... Molding mold.

Claims (1)

[Claims] (1) Form a holding hole in a predetermined position of the core material in which the weight member is embedded and fixed, and wrap the raw material for FRP molding that forms the head outer shell around this core material, and After passing through the material and fitting the support leg protruding from the weight member into the holding hole of the core material, and wrapping the raw material for FRP molding on the weight member, the head molding material is heated to the desired shape. A method for manufacturing a wood club head for golf, which is characterized by placing it in a mold and subjecting it to heat and pressure.