JPH09248353A - Gold club head - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make the thickness of the part where strength is not required as thin as possible, to form a head to a larger size and to enable sure welding. SOLUTION: This golf club head is formed by welding a separate member 10 made of a metal forming the prescribed area of a crown part 3 or sole part 5 to a head body 1 made of a metal exclusive of this prescribed area. In such a case, the thickness of the peripheral edge 6 of the point to be welded with the separate member 10 of the head body 1 and the peripheral edge 11 of the separate body 10 is formed thicker than the thickness exclusive of the peripheral edges 6, 11 excluding the face part 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wood-based metal golf club head.

[0002]

2. Description of the Prior Art Wood-based metal golf club heads are called metal woods or metal heads, and are now in the mainstream in place of persimmon heads. Materials used are stainless steel, titanium and its alloys, aluminum and There are composite type heads using multiple materials, including a wide variety of alloys such as duralumin. In addition, as a manufacturing method, a lost wax (precision casting) method and a forging method are mainly used, and usually, a sole portion and other main body portions are separately produced, and a peripheral portion of the sole portion is welded to the main body portion. The method is commonly used.

Recent metal heads are becoming larger,
The larger size of this head expands the sweet area, reduces the flight distance even when hitting the ball by removing the core, deepens the depth of the center of gravity, increases the moment of inertia, and becomes a club that can be easily hit, Increased average flight distance and improved directionality. If the head weight increases even if the head is made large, it is difficult for a general golfer to shake the head and control it. Therefore, it is necessary to reduce the weight. For this weight reduction, it is optimal to form the entire head with a metal material such as an aluminum alloy having a small specific gravity of 2.7 to 2.8.

[0004]

When manufacturing a large head made entirely of aluminum alloy, particularly a large head having a volume of 270 cc or more, the face portion, which is the striking surface, requires a thickness of at least 4.5 mm, but the remaining It is necessary to mold the crown portion and the sole portion with a thin wall thickness of 1.2 mm or less, further 0.8 mm or less. In this case, when molding using the usual lost wax method, the head main body having a void in the sole portion of the head and a separate member for closing the void prepared separately from this are welded. However, if the welded portion of the head main body and the separate member is made to have the above-mentioned thickness, there is a drawback that cracks due to the sink of the weld easily occur near the welding position.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a golf club head in which the portion not requiring strength is made as thin as possible, the head is made large, and reliable welding is possible.

[0006]

To achieve the above object, the present invention provides a metallic separate member for forming a predetermined area in a metal head body excluding a predetermined area of a crown portion or a sole portion. In a wood-type golf club head formed by welding, the thickness of the peripheral portion of the portion where the separate member of the head body is welded and the peripheral portion of the separate member is the thickness of the portion other than the peripheral portion excluding the face portion. It is formed thicker than the thickness.

[0007]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

In the embodiment shown in FIG. 1, a head body 1 having a face portion 2, a crown portion 3 and a peripheral portion 4,
A separate member 10 that forms a predetermined area of the sole portion 5 is formed, and the separate member 10 is welded to the head body 1 to form a wood-based metal golf club head. The peripheral portion 6 of the head body 1 where the separate member 10 is welded and the peripheral portion 11 of the separate member 10 are made thicker than the peripheral portions 6 and 11 excluding the face portion 2. There is. The main body 1 can be manufactured to have a desired shape and a desired wall thickness by casting a metal material used by the lost wax method, for example. The face portion 2 which requires the highest strength has a large thickness, and a part of the sole portion 5, the crown portion 3 and the peripheral portion 4 are formed.
Has a thin wall thickness.

FIG. 2 is a view of the head as seen from the side of the sole portion 5, where the reference numeral 20 is a welded portion, and the reference numeral 7 is a hosel integrally formed with the head main body 1. The head body 1 may be of a type in which the hosel 7 is not present, that is, a so-called through-bore type in which a shaft penetrates the head body 1, or the crown portion 3 may not be present.

In the embodiment shown in FIG. 3, the predetermined area of the crown portion 3 is a separate member 10 made of metal. The peripheral portion 11 of the separate member 10 is also formed thicker than the other portions, and the peripheral portion 6 of the portion to which the separate member 10 is welded is also formed thicker than the other portions.

FIG. 4 shows the separate member 10 or the separate member 1.
Shows an enlarged cross-section of the part of the head body 1 to be welded with 0,
The thickness t ₂ of the peripheral portion 11 or 6 is set to 2.0 mm, and the peripheral portion 1
The width w of 1 or 6 is 2.0 mm, and the wall thickness t of other portions
₁ was 0.8 mm. This peripheral portion 11 or 6 shows an example of protruding vertically. After welding the peripheral portions 11 and 6, the outer surface is ground to be flush, but the inner surface is cut and examined, and a slight bulge occurs in the welded portion 20.

FIG. 5 shows an example in which the peripheral portion 11 or 6 is projected only to the inner side. The thickness t ₁ is 0.8 mm, the thickness t ₂ is 2.0 mm, and the width w is 2.5 mm. did. The wall thickness t ₁ is preferably about 0.5 to 1.0 mm, and the wall thickness t ₂ is 1.5 to
About 2.5 mm is preferable. The width w is 2.0 to 3.0 mm
The degree is preferred.

As the metal material forming the head body 1 and the separate member 10, an aluminum alloy can be preferably used. Further, the head body 1 may be made of an aluminum alloy, and the separate member 10 forming a part of the sole portion 5 may be made of another metal material having a larger specific gravity than the aluminum alloy, for example. Further, it is effective when the head volume after welding is 270 cc or more.
The maximum volume is about 330cc.

After the post-welding polishing, the head is strengthened by the anodic oxide film treatment. If the head is made of an aluminum alloy and anodized,
Surface hardness increases (Vickers hardness 180Hv or more),
It is less likely to be scratched and can prevent corrosion. After forming the anodized film, it is preferable to form a coating film on this film.

[0015]

As described above, according to the present invention, the wall thicknesses of the peripheral portion of the head body where the separate member is welded and the peripheral portion of the separate member are other than the peripheral portion excluding the face portion. Since it was formed thicker than the thickness of the head, it is possible to increase the size of the head by thinning the thickness of the part where strength is not required as much as possible, and since the peripheral part of the wall thickness is formed at the welding part,
Welding is also performed reliably. In particular, the metal material forming the head body is an alloy of aluminum and has a head volume of 2
In the case of 70 cc or more, by welding the peripheral portions of the wall thickness to each other, cracks due to the sink marks of the welding do not occur, and the wall thickness of the part of the head body excluding the face part is made as thin as possible. The size can be increased without increasing the weight.

[Brief description of drawings]

FIG. 1 is a sectional view showing a first embodiment of the present invention.

FIG. 2 is a view as seen from the sole side.

FIG. 3 is a sectional view showing a second embodiment.

FIG. 4 is an enlarged cross-sectional view of a head body of a separate member or a portion welded to the separate member.

FIG. 5 is an enlarged sectional view similar to FIG. 4;

[Explanation of symbols]

 1 Head Body 2 Face Part 3 Crown Part 4 Peripheral Part 5 Sole Part 6, 11 Peripheral Part 10 Separate Member

Front page continued (72) Inventor Daisuke Sanbe 20 Onohara, Chichibu City, Saitama Prefecture Bridgestone Sports Co., Ltd.

Claims (2)

[Claims] 1. A wood-type golf club head formed by welding a separate metal member that forms the predetermined area to a metal head body excluding the predetermined area of the crown portion or the sole portion. A golf club head, characterized in that a peripheral portion of a portion of the main body to which the separate member is welded and a peripheral portion of the separate member are formed to have a wall thickness thicker than a portion other than the peripheral portion excluding the face portion. 2. A golf club head, wherein the metal material forming the head body is an aluminum alloy, and the head volume is 270 cc or more.