JP2001046561A - Manufacturing method for golf club head - Google Patents

Abstract

PROBLEM TO BE SOLVED: To supply head with simplicity in the work and increased strength of stable unification in the head of type that lets the face member fit the head body. SOLUTION: In a golf club-head that is formed with a head proper and face body 2 with metal materials and that the face body 2 is fit in a hollow formed opening on the face of the head proper, the hollow of the head proper has excess flesh at the periphery and is formed in vertical shape at the inner side, the face body 2 made of soft material is formed in vertical shape at the outer side, and after the latter is placed in the former, the head proper and face body 2 are caulked to interfix by making the excess flesh at periphery of the former subject to plastic deformation with press-forming and concurrently letting the latter also do plastic deformation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a golf club head (hereinafter referred to as a golf club head) in which a head body and a face body are formed of a metal material, and the face body is integrated with a recess formed in the face surface of the head body. (Hereinafter referred to as a head).

[0002]

2. Description of the Related Art Conventionally, as a metal head such as an iron head, a metal wood head and a putter, a method of simultaneously and integrally manufacturing the head itself by forging or lost wax casting, and a method of forming the head into several parts. It is a general method to divide and mold by forging or lost wax casting, and then to integrate and manufacture by welding. Of these conventionally known heads, the former integrally manufactured head is generally formed using the same kind of metal material appropriately selected from carbon steel, stainless steel, aluminum alloy and the like. Also, in the latter type of head which is divided into parts, the welding between different metals is also made of the same material due to problems such as distortion due to a difference in thermal expansion coefficient and difficulty in welding due to a difference in melting temperature. That was common.

On the other hand, recently, a head made of titanium or a titanium alloy having a low specific gravity but a high strength has been known.
Among these types of heads, particularly, in the case of a metal wood type head, since the volume of the head itself can be increased due to its low specific gravity, a head having a large sweet spot can be supplied. Also, among the heads, even in the case of the iron head type, the head itself can be enlarged and the weight can be distributed to the peripheral portion of the head, so that a head having a large sweet spot can be supplied.

However, in these titanium and titanium alloy heads, since the price of titanium itself is expensive, there has been a demand for an inexpensive and popular head. For this reason, in the head of the popular type, a head composed of a combination of different metals is known. That is, by using a material such as titanium or a titanium alloy only for the face body portion, and by configuring the head body with a material such as carbon steel or stainless steel, the weight distribution of the head itself is arranged in the peripheral portion of the head, The purpose of this head is to increase the moment of inertia of the head and increase the degree of freedom in designing the depth of the center of gravity of the head.

[0005]

However, in a head composed of a combination of these dissimilar metals, distortion is likely to occur due to the difference in the coefficient of thermal expansion during welding between dissimilar metals as described above, and the melting temperature is also reduced. Due to the difference, there was a problem that the weldability was difficult and sufficient welding strength could not be obtained. Therefore, recently, Japanese Patent Laid-Open No. 6-18200
As disclosed in No. 6, the head body and the face body are made of dissimilar metals, the face body is housed in an opening formed in the face surface of the head body, and the joint between the face body and the head body is formed. A head is known in which a convex portion is formed on one side and a convex portion engaging with the other concave portion is formed by plastic deformation to prevent the face body from being pulled out.

Further, as disclosed in JP-A-6-246021, the head body and the face body are formed of dissimilar metals, and at least one of the outer peripheral surface of the face body or the inner peripheral surface of the recess of the head body. In addition to forming concave grooves or fine irregularities on the face, a surplus portion is formed at the peripheral edge of the face surface of the face body, the face body is pressed in a recess of the head body, and the surplus portion is crushed and the A head and a method of manufacturing the same, characterized in that the face body is fixed to the recess by making it bite into the other surface of the uneven surface.

Further, as disclosed in Japanese Patent Application Laid-Open No. H10-155949, the head body and the face body are formed of dissimilar metals, and the outer peripheral side surface of the face body and the outer peripheral side surface of the opening of the head body are vertically formed. Insert the face body into the recess formed in the face surface of the head body, apply an adhesive to fix it, and press the excess part provided on the outer periphery of the head body. A head and a method of manufacturing the same are characterized in that only the side surface of the concave portion of the head body is expanded by plastic deformation to fit the face body into pressure contact with the head body.

[0008] However, these conventionally known heads have the following problems. That is, JP-A-6
In one in which a concave portion is formed in one of the joints between the face body and the head body disclosed in Japanese Patent No. -182006, and a convex portion that engages with the concave portion is formed by plastic deformation to prevent the face body from coming off, It is necessary to control the amount of plastic deformation of the convex portion by pressing pressure so as to accurately engage with the concave portion. Further, since the head body is manufactured by the lost wax casting method, the concave portion and the convex portion are easily damaged, and the molding process is performed. There was a problem that it took time and effort.

In addition, a concave groove or fine unevenness is formed on at least one of the inner peripheral surfaces of the concave portion of the head body disclosed in Japanese Patent Application Laid-Open No. 6-246021, and an extra portion is formed on the peripheral edge of the face surface of the face body. The head body is pressed in the recess of the head body to crush the surplus portion and cut the concave groove or fine unevenness into the other surface. In order to crush these extra portions into the concave grooves or the minute uneven surfaces, it is necessary to set a high press pressure, and the head body itself may be deformed. In addition, there is a problem that it takes time and labor to form a concave groove or a fine uneven surface for fitting.

Further, the outer peripheral side surface portion of the opening of the head main body and the outer peripheral side surface portion of the face body disclosed in Japanese Patent Application Laid-Open No. H10-155949 have vertical shapes, and the face body is formed with an opening on the face surface of the head main body. Insert into the recess,
At the same time, the adhesive is applied, and the surplus portion provided on the outer peripheral portion of the head main body is expanded by plastic deformation only on the side surface of the concave portion of the head main body by press working, and the head body is press-fitted with the head main body, Since the head shape is asymmetrical, the concave side surface of the head body cannot be evenly protruded, and it is very difficult to uniformly apply the press-contact strength to the outer peripheral portion of the face body. Also, when trying to eliminate the gap between the face body and the head body by a fitting method that has uneven projections on the concave side surfaces of the head body, the press load is adjusted according to the part with the least amount of deformation. When set, a portion having a large amount of deformation causes excessive deformation, and there is a problem that a face body which is usually harder than the head main body and which dislikes deformation is deformed. Therefore, in a head of a type in which these face bodies are fitted to the head body,
It has been desired to provide a head which is easy to operate, has a stable and strong integration strength, and a method of manufacturing the same.

[0011]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above object. That is, in a golf club head in which the head body and the face body are formed of a metal material, and the face body is fitted into a recess formed in the face surface of the head body, extra space is provided around the opening of the recess in the head body. And the side surface of the concave portion of the head body was formed in a vertical shape, the shape of the outer peripheral side portion of the face body made of a soft material was formed in a vertical shape, and the face body was installed in the concave portion of the head body. After that, plastic deformation is performed by press forming the excess portion around the opening, and at the same time, the face body plastically deforms, and the head body and the face body are deformed.
A method for manufacturing a golf club head, comprising caulking and fitting a golf club body.

According to this method, unlike the conventional method, there is no need to accurately control the amount of plastic deformation of the excess portion, and there is no need to worry about the plastic working of the face body. Further, there is no need to complicately shape the side surfaces of the concave portion of the head main body and the outer peripheral side surfaces of the face body. Therefore, even when the head main body is molded by the lost wax casting method or the like, there is no loss of parts due to the concave portion and the second portion, and it is possible to realize a significant improvement in workability in the conventional process. Further, the problem of the gap in the conventional method of press-fitting and bonding integrated with the head body concave portion and the face body outer peripheral side surface being made into a vertical shape is solved by using a soft material for the face body and actively performing plastic working. It could be solved by using it.

Further, the strength of the integration of the head body and the face body is such that the joining surface between the head body and the face body of the caulked portion has a new surface and is capable of normal elastic fitting because of caulking accompanied by plastic deformation. Excellent in binding properties. Since the joining surface is not flat but microscopic, the anchoring effect is obtained. Furthermore, the effect of the elastic fitting due to the residual strain after the plastic working is superimposed, so that an excellent integration strength can be obtained as compared with other methods.

[0014]

Further, by using a soft material having a Vickers hardness of Hv 100 or less for the face member, plastic deformation of the face member can be performed smoothly. Further, by softening the face body, a buffering effect of softening the hitting sound can be obtained. More preferably, in a golf club head in which the head body and the face body are formed of a metal material, and the face body is fitted into a recess formed in the face surface of the head body, around the opening of the recess in the head body. It has a surplus portion, and the side surface of the concave portion of the head main body is formed in a vertical shape, the shape of the outer peripheral side portion of the face body made of a soft material is formed in a vertical shape, and the face body is formed in the concave portion of the head main body. After the installation, the surplus portion around the opening is plastically deformed by press forming, and at the same time, the face body plastically deforms, and the head body and the face body are caulked and fitted together, and The head body and the face body are fitted by plastically deforming the part, thereby protruding the side surface of the concave part of the head body and plastically processing the face body made of a soft material. There is a method of manufacturing a golf club head according to claim Rukoto.

This is different from the previous method in that the amount of excess
By adjusting the distance between the side surface of the concave portion of the head main body and the outer peripheral side surface of the face body, the plastic deformation portion is extended to the side surface portion of the face body, and the range over which the effect is obtained is widened. Therefore, stronger integration strength can be obtained. Specifically, when the distance between the side surface of the concave portion of the head main body and the outer peripheral side surface of the face body is controlled to 0.3 mm or less, the effect of enlarging the plastic deformation portion can be obtained. Finally, when the face body is installed in the concave portion of the head body, if an adhesive is interposed between the two, a stronger and more stable integration strength can be obtained. In addition, the presence of the adhesive can provide a buffering effect for softening the hitting sound.

[0016]

An embodiment of the present invention will be described with reference to the drawings. A head body 1 shown in FIG. 1 and a face body 2 using a soft material shown in FIG. 2 are formed of a metal material. Figures 3 and 4
As shown in (1), the shape of the side surface portion 3a of the concave portion 3 of the head main body 1 is formed in a vertical shape in advance, and further, a surplus portion 3b is formed around the opening 3c of the face surface 1a. As shown in FIG. 4, the outer peripheral side surface portion 2a of the face body 2 is formed in a vertical shape. The face body used was a sintered body of titanium. Vickers hardness was Hv90 . As shown in FIG. 4, the face body 2 is
It is set in the concave portion 3 formed in the opening a.

The gap 5 between the side surface 3a of the recess 3 of the head body 1 and the outer peripheral surface 2a of the face body 2 was 0.2 mm. In the embodiment, the case where the adhesive 4 is interposed between the head main body 1 and the face body 2 and the case where the adhesive 4 is not made are created. (Not shown when no adhesive is interposed.) FIG.
As shown in the figure, the excess thickness 3b around the opening 3c is plastically deformed by press forming, and at the same time, the face 2
The soft material used for the above-mentioned was plastically deformed over a part or the entire circumference, and the head main body 1 and the face body 2 were caulked and fitted. Further, by pressing the surplus portion 3b, the surplus portion 3b is plastically deformed, thereby filling the gap 5 and plastically deforming a part or the entire outer peripheral side surface 2a of the face body 2 as shown in FIG. As shown in FIG.

The steps between the head main body and the face body in FIG. 5 were removed by ordinary cutting, and the finished products in FIGS. 6, 7 and 8 were obtained. This makes it easy to process parts,
The dimensional design of the parts was easy, and sufficient integrated strength and soft hitting sound were all obtained. As shown in FIGS. 4 and 5, when the adhesive 4 was used, a softer hitting sound could be obtained together with a stronger strength.

[0019]

According to this method, unlike the conventional method, there is no need to accurately control the amount of plastic deformation of the excess portion, and there is no need to worry about the plastic working of the face body. Further, there is no need to complicately shape the side surfaces of the concave portion of the head main body and the outer peripheral side surfaces of the face body. Therefore, even when the head main body is molded by the lost wax casting method or the like, there is no loss of parts due to the concave portion and the second portion, and it is possible to realize a significant improvement in workability in the conventional process. That is, compared to the conventional method, there is an effect that the component processing is easier and the dimensional design of the component can be easily performed. In addition, the problem of strength due to the problem of gaps in the conventional method of simply preventing retaining and the method of press-fitting and bonding integrating the head body concave portion and the face outer peripheral side surface into a vertical shape is soft to the face body. By using the raw material and positively using the plastic working, a sufficient integral strength could be provided. Further, a soft hitting sound could be obtained by using a soft material and an adhesive.
The present invention simultaneously satisfies the properties of easy part processing, easy dimensional design of parts, sufficient integration strength, and soft hitting sound.

[Brief description of the drawings]

FIG. 1 is a front view of a head body of a golf club head according to the present invention.

FIG. 2 is a perspective view of a face of a golf club head according to the present invention.

FIG. 3 is a cross-sectional view of a main part of the head body of the golf club head according to the present invention, showing a cross section taken along line AA of FIG. 1;

FIG. 4 is an enlarged sectional view of a main part showing a method for manufacturing a golf club head according to the present invention.

FIG. 5 is an enlarged sectional view of a main part showing a method for manufacturing a golf club head according to the present invention.

FIG. 6 is an enlarged sectional view of a main part showing a method for manufacturing a golf club head according to the present invention.

FIG. 7 is a perspective view showing one embodiment of fitting the head body and the face body of the golf club head according to the present invention.

8 is a cross-sectional view of a principal part showing a cross section taken along line BB of FIG. 7 of the head of the golf club head according to the present invention.

[Brief description of reference numerals]

 1: head body 1a: face surface 2: face body 2a: outer peripheral side surface part 2b: lower part of the face body 3: concave part 3a: side part of the concave part 3b: excess part of the face body 3c: peripheral part of the opening of the head body 4: adhesive Agent 5: Clearance

Claims (5)

[Claims] 1. A golf club head in which a head body and a face body are formed of a metal material and a face body is fitted in a recess formed in an opening on a face surface of the head body. The head body has a concave portion, and the side surface of the concave portion of the head main body is formed in a vertical shape, the outer peripheral side portion of the face body made of a soft material is formed in a vertical shape, and the face body is formed in the concave portion of the head main body. After that, the excess body around the opening is plastically deformed by press forming, and at the same time, the face body is plastically deformed, and the head body and the face body are caulked and fitted. Of manufacturing a golf club head. 2. The golf club head manufacturing method according to claim 1, wherein the soft material used for the face body has a Vickers hardness of Hv 100 or less. 3. A golf club head in which a head body and a face body are formed of a metal material, and a face body is fitted into a recess formed in the face surface of the head body. The head body has a concave portion, and the side surface of the concave portion of the head main body is formed in a vertical shape, the outer peripheral side portion of the face body made of a soft material is formed in a vertical shape, and the face body is formed in the concave portion of the head main body. Then, plastic deformation is performed by press-molding the excess portion around the opening, and at the same time, the face body is plastically deformed, and the head body and the face body are caulked and fitted, and The head body and the face body are fitted by plastically deforming the surplus part, thereby plastically processing the face body made of a soft material by projecting the side surface of the concave portion of the head body. Method of manufacturing a golf club head according to claim. 4. The method of manufacturing a golf club head according to claim 1, wherein a distance between the side surface of the concave portion of the head body and the outer peripheral side surface of the face body is controlled to 0.3 mm or less. 5. The method of manufacturing a golf club head according to claim 1, wherein an adhesive is interposed between the face body and the head body when the face body is installed in the recess of the head body.