JPH10192458A - Golf club head and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a head having a face insert pressed and fitted to a recessed part formed on a face plane. SOLUTION: In a golf club 1 having a head body 2 and a face insert 3 formed of a metallic material, the face insert 3 being fitted to a recessed part 4 formed on the face part of the head body 2, a thickened part 4b is formed on the opening periphery 4a of the recessed part 4, and the side surface part 4e thereof is vertically formed. A notched part 4g is formed on the side surface part 4e, the side surface part 3a of the face insert 3 is vertically formed, and an adhesive is interposed in the recessed part 4. The thickened part 4b of the opening periphery 4a is crushed by press to extend the side surface part 4e of the recessed part 4, and the side surface part 4e of the recessed part 4 of the head body 2 is pressed and fitted to the face insert 3, and the face insert 3 and the adhesive are also press-fitted to the notched part 4g and adhesively integrated thereto.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a golf club head (hereinafter simply referred to as a golf club head) in which a head body and a face insert are formed of a metal material, and the face insert is press-fitted into a recess formed in the face surface of the head body. And a method for manufacturing the same.

[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 dividing the head into several parts. After forging or lost wax casting, and then integrating them by welding. Among these conventionally known heads, the former integrally manufactured head is generally formed using the same 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 dissimilar 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 high specific strength, which is high in spite of its low specific gravity, has been known. Among these types of heads, particularly, a metal wood type head can supply a head having a large sweet spot because the specific gravity is small and the volume of the head itself can be increased. Also, among the heads, even with an iron head type, the size of the head itself can be increased 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.

[0004] 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. Therefore, in these popular type heads, those configured by combining different kinds of metals are known. That is,
By using materials such as titanium and titanium alloy only for the face insert part, 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 around the head, and the inertia of the head The head is intended to increase the moment 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, as described above, in welding between dissimilar metals, distortion tends to occur due to the difference in the coefficient of thermal expansion, 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 Application Laid-Open No. 6-182006
The head body and the face insert are formed of dissimilar metals, and the face insert is housed in an opening formed in the face surface of the head body,
A head is known in which a concave portion is formed at one of the joints between the face insert and the head main body, and a convex portion engaging with the concave portion is formed by plastic deformation on the other side to prevent the face insert from being removed. .

Further, as disclosed in JP-A-6-246021, the head main body and the face insert are formed of different metals, and at least one of the outer peripheral surface of the face insert or the inner peripheral surface of the recess of the head main body. In addition to forming concave grooves or fine irregularities on the face, a built-up part is formed on the periphery of the face surface of the face insert, and the face insert is pressed in the recess of the head body and the built-up part is crushed to A head and a method of manufacturing the same are characterized in that the face insert is fixed in the recess by making the concave and convex cut into the other surface.

[0007] However, these conventionally known heads have the following problems. That is, JP-A-6
Japanese Patent Application Laid-Open No. -182006 discloses a method in which a concave portion is formed on one of the joints between the face insert and the head body, and a convex portion engaging with the concave portion is formed by plastic deformation on the other side to prevent the face insert from being removed. It is necessary to control the amount of plastic deformation of the convex part by pressing pressure so as to accurately engage with the concave part, and further, by the lost wax casting method, in order to manufacture the head body, the concave part and the convex part are easily damaged and formed. There was a problem that it took time and effort in the manufacturing process.

In addition, a 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. Hei 6-246021, and a built-up portion is formed on the peripheral edge of the face surface of the face insert. In the head where the face insert is pressed in the recess of the head main body and the overlay is crushed and the concave groove or minute unevenness is cut into the other surface, the head body and the face insert are fitted. It is necessary to set a high press pressure in order to crush and dig these build-up portions into the concave grooves or minute uneven surfaces, and the face insert itself may be deformed. Further, there is a problem that it takes time to form a concave groove or a fine uneven surface for fitting. Therefore, in a head of a type in which these face inserts are press-fitted to the head main body, it has been desired to supply a head that is more securely fitted and integrated.

[0009]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above object. That is, the head body and the face insert are formed of a metal material, and in the head in which the face insert is fitted into the recess formed on the face surface of the head body, a built-up portion is formed on the periphery of the opening of the recess of the head body. Then, the shape of the side surface of the concave portion of the head body is formed vertically, the concave portion is formed in the side surface portion, and the side surface portion of the face insert is formed in a vertical shape, and an adhesive is applied to the concave portion of the head body. Intervene,
The side surface of the head body is plastically deformed by crushing the built-up portion of the peripheral edge of the opening with a press, and the head body is pressed into the face insert by press-fitting, and integrated by bonding. And a method of manufacturing the same. That is, the face insert is arranged in a recess formed in the opening on the face surface of the head main body, and press working by a high-pressure press causes the overlaying portion of the opening peripheral edge of the recess of the head main body to be crushed by the press pressure,
The side surface of the head body undergoes plastic deformation, and the gap between the head body and the face insert is buried and press-fitted, and at the same time, the adhesive is press-fitted into the recess so that the face insert is firmly fixed. Is what you can do.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS According to an embodiment of the present invention, a head body and a face insert are formed of different metals, and the face insert is fitted into a recess formed in the face of the head body. In the golf club head, a built-up portion is formed at an opening peripheral edge of the concave portion of the head main body, and a groove is formed at a bottom portion of the concave portion of the head main body, and a shape of a side portion of the concave portion is formed vertically. A concave notch is formed in the side surface, and the side surface of the face insert is formed in a vertical shape, an adhesive is interposed in the concave portion of the head main body, and the overlay on the peripheral edge of the opening is crushed by pressing. The side surface of the head body is plastically deformed, and the gap between the head body and the face insert is buried and press-fitted, and at the same time, the adhesive is pressed into the recessed portion to produce an anchoring effect. A head and a method for manufacturing the same, which are integrated by bonding. As described above, a required amount of adhesive can be held in a groove formed in a bottom surface of a concave portion of a head body and a concave notch in a side surface. Therefore, the adhesive strength can be maintained by the anchor effect.

Although the shape of the side surface of the concave portion of the head body is formed vertically and the concave portion is formed on the side surface portion, when the head body is formed by lost wax casting, By making the core upper and lower split molds than the conventional concave dovetailed tapered groove, the workability in the core extraction work process is similar to that of the conventional concave dovetailed reverse tapered one. It does not decrease. Further, the insertion of the face insert into the head main body is facilitated, and the overlay on the peripheral edge of the opening of the concave portion of the head main body is crushed by pressing, so that the crushed overlay portion is formed between the head main body and the face insert. The gap fit between them can be buried to ensure the press-fitting fit.Furthermore, the grooves formed on the bottom surface of the concave portion of the head main body and the concave notch portions on the side surface portions can hold a necessary amount of adhesive, The adhesive strength is improved by the anchor effect, and the face insert can be securely fixed.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. As shown in FIGS. 1 to 5, a head body 2 and a face insert 3 are formed of a metal material, and In the golf club head 1 which fits into the recess 4 formed in the face surface 2a of the head body 2, a built-up portion 4b is formed at the opening peripheral edge 4a of the recess 4 of the head body 2, and the recess 4 of the head body 2 is formed. Side part 4
e, the recess 4g is formed in the side face 4e, and the side face 3a of the face insert 3 is formed.
Is formed in a vertical shape, an adhesive 5 is interposed in the concave portion 4 of the head main body 2, and the built-up portion 4 b of the opening peripheral edge 4 a is crushed by pressing, so that the side surface portion 4 e of the concave portion 4 of the head main body 2 is pressed.
The face insert 3 and the adhesive 5 are press-fitted into the face notch 4 at the same time as the side face 4e of the recess 4 of the head body 2 is press-fitted into the face insert 3 and simultaneously bonded and integrated. Is a golf club head 1.

In the golf club head 1, the side surface 4e of the concave portion 4 of the head body 2 is formed in a vertical shape, and a concave portion 4g is formed in the side surface portion 4e. It is desirable to set the notched depth to 0.1 mm to 0.3 mm.

Further, one embodiment of the manufacturing method of the present invention will be described with reference to the drawings, as shown in FIGS.
This shows a manufacturing process of the head having the above configuration, in which the head main body 2 is mounted on the lower mold 6B, the face insert 3 is inserted into the concave portion 4 formed in the face surface 2a of the head main body 2, and The built-up portion 4b and the face insert 3 formed at the opening peripheral portion 4a of the concave portion 4 of the head main body 2 are press-fitted by the upper mold 6A. That is, a built-up portion 4b is formed on the opening peripheral portion 4a of the concave portion 4 formed on the face surface 2a of the head main body 2 mounted on the lower mold 6B, and the shape of the side surface portion 4e of the concave portion 4 is set vertically. And a concave portion 4g is formed in the side surface portion 4e, and the side surface portion 3a of the face insert 3 is formed in a vertical shape.
An adhesive 5 is interposed therebetween, and the built-up portion 4b of the opening peripheral edge 4a is crushed by the pressing pressure of the upper mold 6A, so that the side portion of the head main body 2 is plastically deformed and expanded, and the head insert 3 A method for manufacturing a golf club head 1 characterized in that the face insert 3 and the adhesive 5 are press-fitted into the recessed portion 4g at the same time as the main body 2 is press-fitted, and bonded and integrated.

Further, an embodiment of the present invention will be described in detail. For example, the head body 2 is made of steel, alloy steel, stainless steel, or the like.
In addition to a metal material such as carbon steel, copper, copper alloy, beryllium copper alloy, pure titanium, and titanium alloy, the head body 2 may be formed by a lost wax casting method or a forging method. Can be done. Further, as the face insert 3, steel, alloy steel, stainless steel,
Metal materials such as carbon steel, pure titanium, titanium alloy, aluminum, aluminum alloy, copper, copper alloy, and beryllium copper alloy can be appropriately selected and combined. In particular, by selecting and combining different kinds of metal materials having a lower specific gravity than the head main body 2 as the face insert 3, the weight distribution of the head main body 2 is distributed to the peripheral portion of the head main body 2, so that the head itself is formed. In addition, the moment of inertia increases, the sweet spot is widened, and the depth of the center of gravity of the head itself can be increased, so that even a beginner can easily hit a ball and provide a golf club that is easy to hit. Furthermore, by using pure titanium or a titanium alloy for the face insert 3, since these materials are lightweight, and have high specific elasticity and high specific strength, it is possible to hit the ball easily with good ball separation, and it is possible to use an intermediate ball. It is possible to provide a golf club suitable for a golfer or an advanced golfer.

In the present invention, the height of the face insert 3 is set to about 1.2 mm to about 1.0 mm to 1.1.0 mm at the opening peripheral portion 4a of the recess 4 formed in the face surface 2A of the head body 2. While forming a built-up part 5 of 2 mm and a width of about 0.4 mm to about 0.4 mm ± 0.1 mm,
The side surface 4e of the concave portion 4 is formed in a vertical shape, and further, the concave portion 4g is formed in the side surface 4e, and the concave depth of the concave portion 4g can be set to 0.1 mm to 0.3 mm.

Further, as shown in FIG. 6, the recessed portion 4g may be formed on the four side faces of the side face 4e of the recess 4 or as shown in FIG. 4e
4 or a top edge side portion 4a 'and a leading edge side portion 4a''of the recess 4 of the head main body 2 as shown in FIG. Although it did not do, the toe side surface 4a '''of the concave portion
It is also possible to form the heel side portion 4a "" in pairs. By thus forming a pair, the face insert 3 and the adhesive 5 can be press-fitted to produce an anchoring effect. It is desirable that the concave portion 4g is formed substantially at the center of the side surface portion 4e of the concave portion 4 as the portion for forming the concave notch portion 4g. The shape of the concave notch 4g may be a triangular or semicircular cross section, and may be formed in a continuous groove shape, or may be a triangular or semispherical cross section. And can be formed in a discontinuous dot shape.

Further, as shown in FIGS. 1, 4, 6 and 7, the portions for forming the overlaid portions 5 are concave portions 4 as shown in FIGS.
The entire circumference of the opening peripheral portion 4a (the top edge side surface portion 4a ',
Leading edge side 4a '', toe side 4a ''''
, The heel side surface portion 4a '''') allows the face insert 3 to be more securely press-fitted.

Although not shown, it is also possible to form a groove on the bottom surface 4c of the recess 4 formed in the face 2A of the head body 2. If the depth of the groove at that time is formed to about 0.1 to 0.5 mm,
The required amount of adhesive can be maintained, the anchoring effect is further improved, and the adhesive strength is increased. As for the position of the groove formed in the bottom surface 4c of the recess 4, it is better to form the groove inside the portion where the bottom surface 4c and the side surface 4e of the recess 4 are joined. Can be formed flush with each other. That is, if the position of the groove is formed at a position where the bottom surface 4c and the side surface 4e of the concave portion 4 are joined, the end of the face insert 3 falls into the groove due to the press pressure, and the face insert 3 warps. The press-fitting contact surface between the head and the head body 2 cannot be formed flush.

[0020]

As described above, in the golf club head and the method of manufacturing the same according to the present invention, the build-up portion is formed on the peripheral edge of the opening of the concave portion of the head main body, and the side face shape of the face insert and the shape of the head main body are determined. The side surface shape of the concave portion is formed vertically, an adhesive is interposed in the concave portion of the head main body, the overlay portion of the peripheral edge of the opening is crushed by pressing, and as a result, the side portion of the head main body is plastically deformed and expanded, By press-fitting the head body to the face insert, the head body is firmly press-fitted, and a head body with a large fitting strength can be obtained. Therefore, even if the ball is repeatedly hit, the face insert is loosened or noise is generated. And the durability is improved.

In addition, in the golf club head and the method of manufacturing the same according to the present invention, a built-up portion is formed on the opening peripheral portion of the concave portion of the head body, and the built-up portion is crushed by a press, so that the opening peripheral portion is formed. The built-up portion buryes the gap between the head body and the face insert, so that the press-fitting is extremely good. In addition, the required amount of adhesive is held in the concave notch formed on the side surface of the concave portion together with the use of adhesive. Since the face insert is partially press-fitted, the anchoring effect is further increased, and the adhesiveness between the head main body and the face insert is further strengthened.

[Brief description of the drawings]

FIG. 1 is a perspective view showing one embodiment of a golf club head according to the present invention.

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

FIG. 3A shows the golf club head according to the present invention in FIG. 2;
Sectional drawing which shows the cross section of -A part.

FIG. 4 is a partial plan view showing another embodiment of the golf club head according to the present invention.

FIG. 5B of the golf club head according to the present invention in FIG. 4;
Sectional drawing which shows the cross section of -B part.

FIG. 6 is a partial plan view showing another embodiment of the golf club head according to the present invention.

FIG. 7 is a partial plan view showing another embodiment of the golf club head according to the present invention.

FIG. 8 is a cross-sectional view of a main part showing a press-fitting step of the method for manufacturing a golf club head according to the present invention.

FIG. 9 is a cross-sectional view of a main part showing a press-fitting step of the method for manufacturing a golf club head according to the present invention.

[Explanation of symbols]

 Reference Signs List 1 golf club head 2 head body 2a face surface 3 face insert 3a side surface portion 3b lower surface portion 4 concave portion 4a opening peripheral portion 4b overlay portion 4c bottom surface portion 4e side surface portion 4g concave notch portion 4a 'top edge side surface portion 4a' 'leading edge Side surface 4a "" Toe side 4a "" Heel side 5 Adhesive 6A Upper die 6B Lower die 7 Clearance

Claims (3)

[Claims] 1. A golf club head in which a head body and a face insert are formed of a metal material, and wherein the face insert is fitted into a recess formed in the face surface of the head body. Forming a built-up portion, and forming the shape of the side surface portion of the concave portion vertically, forming a concave notch portion in the side surface portion, and forming the side surface portion of the face insert in a vertical shape, An adhesive is interposed in the concave portion, and the built-up portion of the peripheral edge of the opening is crushed by pressing, the side surface portion of the concave portion of the head body is expanded, and press-fitted to the face insert by press-fitting, and bonded and integrated. A golf club head characterized in that: 2. The golf club head according to claim 1, wherein a side surface of the concave portion of the head body is formed vertically, a concave portion is formed in the side portion, and a concave depth of the concave portion is 0.1 mm. ~
2. The golf club head according to claim 1, wherein the head is set to 0.3 mm. 3. A method of manufacturing a golf club head, wherein a head body and a face insert are formed of dissimilar metals, and the face insert is fitted and integrated into a recess formed in the face surface of the head body. A built-up portion is formed on an opening peripheral portion of a concave portion formed on the face surface of the mounted head main body, a side surface portion of the concave portion is formed in a vertical shape, and a concave notch portion is formed on the side surface portion. The side surface of the head body is formed by forming the side surface of the face insert into a vertical shape, interposing an adhesive in the recess of the head body, and crushing the overlaid portion of the peripheral edge of the opening by pressing pressure using an upper mold. A golf club head characterized in that the portion is expanded by plastic deformation, and the head body side is pressed against the face insert side to be press-fitted and bonded and integrated. Manufacturing method.