JPS6297571A - Production of iron club 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 [Industrial Application Field] The present invention relates to a method for manufacturing a golf iron club in which the ball-hitting surface of a head made of a metal material is lined with a fiber-reinforced plastic member.

[Conventional technology]

Recently, this type of golf club, for example an iron club, has a head entirely made of stainless steel, cast iron, or iron! In addition to the Gold 8 material of Iik '8, fiber reinforced plastic (hereinafter referred to as F
In particular, a club head with a composite structure in which CFRP (carbon fiber reinforced plastics), which is made of a highly elastic material made of carbon m pairs and reinforced lli fibers, is attached is attracting attention.

The above-mentioned club head has a ball-hitting surface made of CFRP, which gives the ball the repulsion characteristics unique to CFRP when hitting the ball, increasing the flight distance of the ball, and reducing the overall weight of the head. The aim is to stabilize the direction of the ball.

[Problem that the invention seeks to solve]

However, such conventional club heads, especially those made entirely of metal, suffer from poor shot feel due to fixed material properties, and because the head body is made of a uniformly proportioned Φ member, there is a partial weight loss. Due to the lack of adjustment, it was impossible to adjust the inertia rate of the head. In addition, the core is made of metal and the outer periphery is made of CFRP.
Even in club heads made of CFRP, the ball hitting surface is made of CFRP.
Because of this, it is not only easily damaged, but also because only the sole is heavy and the upper ball-hitting surface is made of light material, the weight distribution feels unbalanced and it is not effective in adjusting the inertia of the head. It had various problems such as.

Therefore, in order to solve the above-mentioned problems, a fiber-reinforced member made of a high elastic modulus material such as CFRP is attached along the back side of the ball-hitting surface of the head body made of a metal material, and the ball-hitting surface of the head is made of a metal material. By backing up the metal surface with a high elastic modulus material and creating a metal-FRP composite laminate structure,
It protects the FRPIa material from external forces, improves the feel at impact, and transfers the weight loss due to the 1ilk reinforcement of high-modulus material to other parts of the head other than the ball-hitting surface, without increasing the weight of the head as a whole. It has been proposed that the inertia rate of the head can be adjusted.

In order to manufacture such a head of the prior invention, a recess is formed on the back side corresponding to the ball hitting surface of the head body, and an FRP plate is fitted and pasted into the recess corresponding to the ball hitting surface. It is manufactured to be able to prevent the FRP plate from peeling off due to the impact when hitting the ball by pressing a ring-shaped fixing member onto the rear peripheral edge of the plate. The peripheral edge of the head body can be made thicker in the ball hitting direction because the weight of the ball hitting surface is reduced and it can move, so that the cross-sectional shape of the head body in the ball hitting direction becomes approximately U-shaped. Therefore, the weight distribution is distributed in all directions from the center of gravity of the head, so that the increase in the rate of inertia can be easily adjusted.

However, in the above-mentioned prior invention, when attaching the FRP plate to the recess on the back side of the head main body, since both materials are in a solid state, they do not blend together and the mating between the two contact surfaces is difficult. This results in insufficient contact between the metal plate and the FRP plate, making it difficult to receive the impact when the ball is hit by acting as a composite M)J structure of the metal plate and the FRP plate, and due to the fixing member. If the pressing force against the FRP plate is insufficient, a new problem arises in that the FRP plate is likely to peel off due to the impact when the ball is hit, and the ball hitting surface of the head will be destroyed.

This invention was made under the above circumstances, and its purpose is to make it possible to line the back side of the head body corresponding to the ball hitting surface by bringing FRP into close contact with the entire surface of the head body. An object of the present invention is to provide a manufacturing method for a golf iron club.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention forms a recess in advance on the back side corresponding to the ball-hitting surface, flattens the surface of the recess corresponding to the ball-hitting surface, and overlaps the peripheral edge of the flat surface. A process of molding a head body made of a metal material with a hang part formed thereon, a process of attaching a reinforcing mLm dark blue member along the flat surface of the recessed part on the back side of the head body, and a process of attaching a reinforcing ILN member after the attachment. The method comprises a step of impregnating a member with a liquid synthetic resin for a matrix, and a step of thermosetting the reinforcing fiber member impregnated with the liquid synthetic resin. It is possible to arbitrarily select whether or not to pressurize the reinforcing fibers of the impregnated steel with the liquid resin during the attachment step. Further, the preceding step in the order of the step of attaching the reinforcing fiber member into the head and the step of impregnating the liquid synthetic resin for the matrix can be set arbitrarily, and the order of the two steps can be used together. You can also.

[For production]

That is, in the present invention, by the above-described means, the head body made of a metal material is integrally formed with the ball-hitting surface portion and other parts, and a recess is formed on the back surface in the 0-ball direction, and the ball-hitting surface portion of this recess is formed. An overhang is formed on the periphery of the surface corresponding to the surface, a reinforcing fiber member is attached, and the liquid synthetic resin for the matrix is impregnated and cured by heating and, if necessary, pressure. The liquid synthetic resin for the fiber member and the matrix can be filled up to the overhang of the recess on the back side of the head main body when attached to the recess of the head, and the whole can be cured while maintaining the fiber arrangement form.

Moreover, if pressure is applied during the heat curing, the filling effect can be further ensured. As a result, the FRP can be attached with good adhesion to the entire surface corresponding to the ball-hitting surface of the recess on the back side of the head body, increasing the reinforcing effect. It becomes possible to securely hold and fix the device without using any type of fixing member.

〔Example〕

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

1 and 2 show an embodiment of a golf iron club obtained by the manufacturing process according to the present invention, in which 1 is made of a metal material such as stainless steel, cast iron, or brass. This is the head body of an iron club. The ball hitting surface portion of the head body 1, that is, the back side of the ball hitting surface portion 2 made of a thin metal plate in the ball hitting direction, is arranged such that the thickness of the ball hitting surface portion 2 is thinner than the thickness of the upper edge portion 1a and the sole portion 1b of the head body. A recessed portion 3 is formed in the recessed portion 3, a surface 3a of the recessed portion 3 corresponding to the ball hitting surface portion 2 is made flat, an overhang portion 4 is formed at the peripheral edge of this flat surface 3a, and an overhang portion 4 is formed on the outside thereof. A plate-shaped fiber-reinforced member 5 made of a high elastic modulus material such as CFRP with which the peripheral edge 5a is fitted is attached in close contact, so that the part corresponding to the ball-hitting surface of the head is made of a double layer of metal plate and CFRP. It is constructed to have a composite Iti layer structure.

That is, in order to manufacture the above-mentioned golf iron club of the present invention, as shown in FIGS. 3 to 6, the back side corresponding to the ball hitting surface portion 12 of the head body 11, which is previously formed in a separate process, is A recess 13 is formed in the ball hitting direction, and a surface 13a of the recess 13 corresponding to the ball hitting surface is made flat, and an overhang portion 14 is formed on the peripheral edge of the flat surface 13a at the same time as casting or cutting. (see Figure 3).

Next, after the head main body 11 is fixed on a stand (not shown) with the ball hitting surface portion 12 as a mounting surface, a reinforcing fiber member 15 is laid in the recess 13 (see FIG. 4).

In this state, after impregnating the reinforcing fiber member 15 with the matrix liquid synthetic resin 16 (see FIG. 5), a pressure mold 17 made of rubber or metal is inserted into the recess 13 of the head body 11 from the back side. The reinforcing fiber member 15 impregnated with the matrix liquid synthetic resin 16 is heated and, if necessary, pressurized to harden it (see FIG. 6).

As a result, an iron club head as shown in FIGS. 1 and 2 is formed.

By the way, as the above-mentioned reinforcing fiber member 15, for example, the reinforcing m
Wet-type reinforcing fibers made by laminating multiple fibers in multiple layers and impregnating the reinforcing fibers made of such a laminate with an uncured synthetic resin solution for matrix such as epoxy resin or unsaturated polyester resin are used. As reinforcement fiber scales, in addition to the single use of carbon m5tt made of two-dimensional or three-dimensional weave, carbon fibers are mainly used, such as aromatic polyamide fibers with a high elastic modulus, glass fibers, and boron I.
l fiber, silicon carbide am or alumina l1M
etc. are preferably used in combination. Furthermore, such FR
In addition to P, it is also possible to use a II miscellaneous reinforced metal (hereinafter abbreviated as FRM) in which a metal material is used as a matrix. Furthermore, the weaving and knitting forms of reinforcing fibers include cloth alone,
The reinforcing effect can be adjusted by using a combination of cloth and roving, by using a mat alone, or by using it in combination with other cloths.

Also, fill the raw material 1 only to the inside of the overhang part Ia1'! The thickness of the FRP board can be adjusted without being affected by the height of the overhang by filling the suspension around one circle from the surface of the overhang.

Further, the thickness of the metal plate constituting the ball hitting surface portion 2 of the head body 1 described above is 0.5 to 3.0 mm, preferably 1.0 mm.
~2.0IIR, and the thickness of the fiber reinforced member 5 on the back side is 1
．． It is suitably adjusted in the range of 0 to 10.0 tra, preferably 3.0 to 6.0 tra, depending on the club count or the bending rigidity of the shaft.

With this structure, the weight corresponding to the weight reduction that becomes unnecessary due to the attached reinforcement of the relatively lightweight fiber reinforced member 5,
By moving it to other parts, such as the sole or back part of the 66 head main body 1, or other parts of the periphery of the head, it is possible to adjust the inertia rate of the head under the same weight. .

In the embodiment of the present invention, the surface corresponding to the ball-hitting surface of the recess on the back side of the head body is made flat on the instep, but the flat surface may be roughened or rib-like protrusions may be formed on the top and bottom. By providing the FR
It is also possible to further enhance the adhesion effect of P. In addition, it goes without saying that this invention can be modified in various ways without departing from the gist of the invention.

〔Effect of the invention〕

As explained above, according to the present invention, a recess is formed on the back side of the head body made of a metal material corresponding to the ball-hitting surface, and a fiber-reinforced member is attached to the surface of the recess corresponding to the ball-hitting surface. An overhang part is formed on the peripheral edge of the surface of the recess corresponding to the ball-hitting surface, and after a reinforcing fiber member is laid in the recess in advance, it is impregnated with a matrix liquid synthetic resin and cured under heat and pressure. Karakin 1ii
It is possible to improve the adhesion or fit of the fiber reinforced member to the joint surface of the head body made of U material, and it is also filled in the overhang part when attaching the reinforcing fiber member and the liquid synthetic resin for the matrix. Since it is possible, tl
Because the outer peripheral edge of the N reinforcing member is hardened and formed by fitting into the overhang part,! By reliably holding and fixing the miscellaneous reinforcing member, it is possible to prevent the fiber reinforcing member from falling off without using a ring-shaped fastening member. In this case, it is preferable to form the overhang part over the entire circumference of the FRP board, but it is not necessarily limited to this, and it is also possible to provide it only in the upper and lower parts of the head or in the part after the head has erupted. Further, they are not necessarily provided continuously, but can also be provided discontinuously.

[Brief explanation of drawings]

FIG. 1 shows a golf iron club according to the present invention.
FIG. 2 is a front view of the main parts showing the embodiment; FIG. 2 is a vertical view taken along line 1--2 in FIG. 1; FIGS. 3 to 6 are explanatory diagrams showing the manufacturing process according to the present invention. DESCRIPTION OF SYMBOLS 11... Head main body, 12... Ball hitting surface portion, 13... Recessed portion, 13a... Corresponding surface of ball hitting surface portion, 14... Overhang portion, 15... Reinforcing fiber member, 16... - Liquid synthetic resin for matrix, 17...pressure type.

Claims (1)

[Scope of Claims] A step of molding a head body made of a metal material by forming a recess on the back side corresponding to the ball hitting surface and forming an overhang on the peripheral edge of the surface of the recess corresponding to the ball hitting surface. a step of attaching a reinforcing fiber member along the recess on the back side of the head main body; a step of impregnating the reinforcing fiber member after being attached with a liquid synthetic resin for matrix; and a step of impregnating the reinforcing fiber member with the liquid synthetic resin. A method for manufacturing a golf iron club comprising the steps of heating and curing a reinforcing fiber member.