JPH10155949A - Golf club head and method of manufacturing the same - Google Patents

Abstract

(57) [Problem] The present invention relates to 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. It relates to an improvement in the manufacturing method. SOLUTION: In a golf club head 1 in which a head main body 2 and a face insert 3 are formed of a metal material, and the face insert 3 is fitted into a concave portion 4 formed in the face surface 2a of the head main body 2, the head main body is provided. Forming portions 4b are formed on the peripheral edge 4a of the opening of the second concave portion 4, the side surface portion 4e of the concave portion 4 is formed in a vertical shape, and the side surface portion 3a of the face insert 3 is formed in a vertical shape, The 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 to expand the side surface portion 4 e of the concave portion 4 of the head main body 2, and the head insert 3 A golf club head 1 and a method of manufacturing the golf club head, wherein the main body 2 is press-fitted and bonded and integrated by pressing.

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. 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 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, in a head in which the head body and the face insert are formed of a metal material and the face insert is fitted into a recess formed in the opening of the face surface of the head body, a built-up portion is formed on the periphery of the opening of the recess in the head body. While forming, the side surface of the concave portion is formed in a vertical shape, and the shape of the side surface portion of the face insert is formed in a vertical shape, a face insert is installed in the concave portion of the head main body, and an adhesive is interposed, and The overlaid portion around the opening is crushed by the press pressure of the upper mold, the side surface of the concave portion of the head body is plastically deformed and expanded, and the press-fitting and bonding are integrated by pressing against the face insert. A head and a method of manufacturing the same.

[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, a side portion of the concave portion is formed in a vertical shape, and a side portion of the face insert is formed in a vertical shape, A face insert is installed in the concave portion of the head body, an adhesive is interposed, and the built-up portion of the peripheral edge of the opening is crushed by press pressure using an upper mold, so that the side surface portion of the concave portion of the head body is plastically deformed. A head and a method for manufacturing the same, wherein the head is press-fitted and bonded and integrated by pressing against the face insert. By forming the shape of the side part of the concave part of the head body into a vertical shape and the shape of the side part of the face insert into a vertical shape, even when the head body is molded by the lost wax casting method, the conventional The workability in the core removal process is more improved than that of the recess having the dovetail structure. In addition, the face insert can be easily inserted into the head body, and the overlaid portion around the opening of the recess of the head body is crushed by pressing, so that the crushed overlaid portion is formed on the side surface of the recess of the head body. Since the press-fitting can be reliably performed by burying the clearance fit between the portion and the face insert, it can be strengthened by fitting and bonding and integration.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, a head body 2 and a face insert 3 are formed of a metal material, and the face insert 3 is attached to the face surface of the head body 2. In the golf club head 1 fitted in the concave portion 4 formed in the opening 2a, a built-up portion 4b is formed on the opening peripheral edge 4a of the concave portion 4 of the head body 2, and the side portion 4e of the concave portion 4 is formed in a vertical shape. And the side face 3a of the face insert 3 is formed in a vertical shape, and an adhesive 5 is attached to the recess 4 of the head body 2.
The press-fitting portion 4b of the opening peripheral edge 4a is crushed by a press to expand the side surface portion 4e of the concave portion 4 of the head main body 2, and the head main body 2 is pressed against the face insert 3 to be pressed and fitted. A golf club head 1 characterized by being integrated by bonding.

In the golf club head 1, the side face 4e of the recess 4 of the head body 2 is formed in a vertical shape, and the side face 3a of the face insert 3 is formed in a vertical shape. .1mm-0.2m
It is desirable to set m.

Further, an 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 on the opening peripheral portion 4a of the concave portion 4 of the head main body 2 are pressed by the press pressure of the upper mold 6A to be pressed and fitted. That is, the recess 4 formed in the face surface 2a of the head body 2 mounted on the lower mold 6B.
Forming a built-up portion 4b at the opening peripheral portion 4a, forming a side surface portion 4e of the concave portion 4 in a vertical shape, and forming a side surface portion 3a of the face insert 3 into a vertical shape. An adhesive 5 is interposed in the concave portion 4 of the above, and the overlay portion 4b of the opening peripheral edge 4a is crushed by a press.
A golf club head 1 characterized in that the gap 4 is buried, press-fitted and bonded and integrated by plastically deforming and expanding the side face 4 e of the recess 4 of the head body 2 and pressing the face insert 3. It is a manufacturing method of.

Further, one 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. I can do it. The face insert 3 may be appropriately selected from metal materials such as steel, alloy steel, stainless steel, carbon steel, pure titanium, titanium alloy, aluminum, aluminum alloy, copper, copper alloy, and beryllium copper alloy and combined. it can. In particular, by selecting and combining different metal materials having a lower specific gravity than the head main body 2 as the face insert, the weight distribution of the head main body 2 is distributed to the peripheral portion of the head main body 2, so that the weight of the head itself is reduced. Since the moment of inertia is increased, the sweet spot is widened, and the depth of the center of gravity of the head itself can be increased, a golf club that is easy for a beginner to hit easily and can hit easily can be provided. 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 1.0 mm on the opening peripheral edge 4a of the recess 4 formed in the face surface 2A of the head main 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 gap between the side surface portion 4e of the recess 4 and the side surface portion 3a of the face insert 3 is kept within a range of 0.1 mm to 0.2 mm so that when pressed and fitted, the boundary between the head body and the face insert becomes vertical. The joining is performed, and the joining surfaces are beautifully connected to be flush with each other, so that a defect such as a gap or a discontinuous waving of the joining surface can be prevented. In addition, as shown in FIGS. 1 and 3, the built-up portion 5 formed on the opening peripheral portion 4 a of the concave portion 4 formed on the face surface 2 </ b> A of the head body 2 has the entire periphery of the opening peripheral portion of the concave portion 4. (Top edge side opening edge 4a ', leading edge side opening edge 4
a ", the toe-side opening peripheral edge 4a"", and the heel-side opening peripheral edge 4a""), the face insert 3 can be more securely press-fitted.

[0016]

As described above, in the golf club head 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 surface of the concave portion of the head main body is formed in a vertical shape. Also, the shape of 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 built-up portion of the peripheral edge of the opening is crushed by the pressing pressure of the upper mold. The side surface of the recessed part is plastically deformed and expanded, and the head body is pressed against the face insert to be firmly pressed and fitted to obtain a head body with a large fitting strength. Also, the face insert is not loosened or the sound is not distorted, and the durability is improved.

In addition, in the method of manufacturing a golf club head according to the present invention, the head main body is securely held by the lower mold, and a built-up portion is formed on the periphery of the opening of the concave portion of the head main body. Is crushed by the press pressure of the upper mold, the overlaying portion of the opening rim buries the gap between the head body and the face insert, and the press-fitting is extremely good. In addition to being able to obtain a mating surface, the combined use of an adhesive makes it possible to simultaneously and integrally bond the head main body and the face insert, thereby further increasing the adhesiveness.

[Brief description of the drawings]

FIG. 1 is a perspective view showing one embodiment of fitting a head body and a face insert 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 plan view showing another embodiment of the head body of the golf club head according to the present invention.

5 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 BB of FIG. 4;

FIG. 6 is an essential part cross-sectional view showing a press-fitting step of the method of manufacturing a golf club head according to the present invention.

FIG. 7 is an essential part cross sectional view showing the 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 main body 2a face surface 3 face insert 3a side surface portion 4 concave portion 4a opening peripheral portion 4a 'top edge side opening peripheral portion 4a "leading edge side opening peripheral portion 4a"' toe side opening peripheral portion 4a " '' Heel side opening edge 4b Overlay 4c Bottom 4e 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. A built-up portion, a side surface portion of the concave portion is formed in a vertical shape, and a side surface portion of the face insert is formed in a vertical shape; A golf club characterized in that a built-up portion of the peripheral edge of the opening is crushed by a press to expand the side surface portion of the concave portion of the head main body, and is press-fitted and bonded to the face insert to be integrated. Club head. 2. The golf club head according to claim 1, wherein the side surface of the concave portion of the head body is formed in a vertical shape, and the side surface of the face insert is formed in a vertical shape. The golf club head according to claim 1, wherein the golf club head is set. 3. A method of manufacturing a golf club head, wherein a head body and a face insert are formed of a metal material, 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 at 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 side surface portion of the face insert is formed in a vertical shape. By placing a face insert in the concave portion of the head main body and interposing an adhesive, and crushing the built-up portion of the peripheral edge of the opening by pressing pressure with the upper mold, the side surface portion of the concave portion of the head main body is formed. A golf club characterized by being expanded by plastic deformation and press-fitted and bonded integrally by pressing the head body side against the face insert side. Method of manufacturing a head.