JP2001129130A - Golf club head - Google Patents

Abstract

(57) [Summary] [Problem] To free the design of the head main body, facilitate the formation of unevenness, facilitate the design of the center of gravity position, and freely design the sole to come in contact with the ground. Be able to do it. SOLUTION: In a hollow golf club head having a metal outer shell, at least a face portion 1 is formed by forging or pressing using a forged material or a rolled material, and a head body portion including at least a sole portion 2A and a side portion 2B. 2 is formed by casting, the crown portion 3 is formed as a separate body, and the face portion 1, the head body portion 2, and the crown portion 3 are fixed to each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hollow golf club head having a metal shell.

[0002]

2. Description of the Related Art In a conventional hollow golf club head having a metal outer shell, as shown in FIG. 7, a pipe portion 21 for attaching a face surface portion 20 and a shaft 25 is fixed later by forging such as pressing. And a rear upper half portion 23 and a rear lower half portion 24, which are fixedly integrated with each other to form a head. In this conventional example, in consideration of the fact that heads manufactured by the precision casting method, that is, the lost wax method, are likely to have pinholes, racks, etc., they are divided into a plurality of parts by forging and manufactured, and each part is welded. By fixing, the disadvantages caused by the lost wax method are eliminated.

[0003]

A conventional rear lower half portion 2
Reference numeral 4 also includes a sole portion of the head, and this portion is often subjected to various modifications in order to lower the center of gravity or to make the head come off easily in contact with the ground. However, when this part is manufactured by forging, it is difficult or impossible to form a complicated design or irregularities. Also, the hosel portion 22 is disadvantageous in that it is manufactured by forging as compared with a cast product in terms of setting the position of the center of gravity and ensuring the fixing of the shaft. Further, even when a weight member is provided inside the head, there are limitations on the fixing, position, size, material, and the like of a forged product.

Accordingly, the present invention aims at liberalizing the design of the head main body including at least the sole, facilitating the formation of irregularities, facilitating the design of the position of the center of gravity, and improving the detachment of the sole in contact with the ground. To provide a golf club head capable of freely designing the golf club head.

[0005]

In order to achieve the above-mentioned object, the present invention provides a hollow golf club head having a metal outer shell, wherein at least the face portion is formed by forging or pressing using a forged material or a rolled material. Molding and molding the head body including the sole part, the side part and the hosel part or the head body part composed of the sole part and the side part by casting, and creating the crown part separately, the face part,
The head body and the crown are fixed to each other.

[0006]

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

In the embodiment shown in FIG. 1, a hollow golf club head having a metal outer shell is composed of four parts: a face portion 1, a head body portion 2, a crown portion 3, and a hosel portion 4. The face portion 1 is formed by forging or pressing using a forged material or a rolled material. The head body 2 has a sole 2A and a side 2B.
This head main body 2 is manufactured by precision casting (lost wax method).
Molding. The crown 3 is formed by forging or pressing using a forged material or a rolled material. Also,
The hosel part 4 is also formed by forging or pressing using a forged material or a rolled material. The hosel portion 4 is fixed to the sole portion 2A and the side portion 2B by welding or the like. The sole portion 2A has a V-shaped ridge 5 and a cylindrical convex portion 6 as viewed from the inside.
Is formed.

FIG. 2 is a sectional view showing a state in which the four parts shown in FIG. 1 are fixed to each other, and a weight member 7 is provided in a concave portion 6A formed on the lower surface side of the cylindrical convex portion 6. The lower surface side of the ridge 5 is formed in a groove 5A to improve the removal of the head.

In the embodiment shown in FIGS. 1 and 2, the face portion 1 and the crown portion 3 are made of titanium alloy SP70.
Using a rolled material of No. 0, a desired shape was finished by punching and press molding to a desired size. The thickness of the face 1 was 3.0 mm, and the thickness of the crown 3 was 0.8 mm.
The hosel part 4 was formed by forging a β-titanium alloy of 15-3-3-3 by forging, and the hosel hole processing was performed later. The head body 2 is formed by casting a 15-3-3-3 β-titanium alloy by casting, and the sole body 2A is designed such that the groove 5A extends from the face side to the back side on the lower surface. 2, a cylindrical convex portion 6 having a concave portion 6A was formed at a position on the back side surrounded by the V-shaped design, and a copper alloy was press-fitted into the concave portion 6A and fixed by caulking. The parts were fixed by placing the head in an argon gas atmosphere and fixing them by arc welding. The volume of the golf club head obtained by fixing the respective parts as described above was 300 cc and the weight was 194 g.

In each of the above-described embodiments and the embodiments described below, the weight member 7 is in the range of 5 to 50 g, particularly 10 to 50 g.
It is desirable to use it in the range of 35 g, and if it is less than 5 g, the weight of the weight member 7 will be small, and it will be difficult to fix it to the head. In the case of the weight member 7 of less than 5 g, it is more advantageous in terms of cost to increase the thickness of a part of the head main body 2. On the contrary, 50 as the weight member 7
If the value exceeds g, there is a disadvantage that the volume of the head must be reduced. However, in a fairway wood having a smaller head volume than a driver head, the weight member 7 can be used up to 90 g. Further, as the weight member 7, besides copper and copper alloy,
Lead, tantalum, tungsten and alloys thereof can be suitably used. Further, a recess 6A in which the weight member 7 is provided
May not be one place but may be plural places.

In another embodiment shown in FIG.
A, the hosel portion 4 as well as the side portion 2B are integrally formed by casting. The sole 2A of the head main body 2 is provided with a ridge 5 similar to that of the previous embodiment, and a cylindrical body 61 is formed instead of the cylindrical convex 6. The weight member 7 is fitted and fixed in the hollow portion of the cylindrical body 61.

FIG. 4 is a view of the embodiment shown in FIG. 3 as viewed from the lower surface side, and FIG. 5 shows a cross section taken along line XX of FIG. A female screw is formed on the inner peripheral surface of the hollow portion of the cylindrical body 61, and a male screw is formed on the outer peripheral surface of the weight member 7 to be screwed into the female screw. 61 can be fixed in the hollow portion.

The golf club head according to the present invention comprises:
A golf club head is manufactured by dividing into three-piece or four-piece or more parts and molding them separately, and then fixing each part. As a method for fixing the respective parts, welding is preferable, and arc welding such as TIG welding or MIG welding can be suitably employed. In particular, in the case of easily oxidizable metals such as titanium and its alloys, inert gas such as argon gas is used. It is preferable to perform welding in a gas atmosphere.

The head main body 2 having at least the sole portion 2A and the side portion 2B is provided with a convex portion or a concave portion (a ridge 5, a cylindrical convex portion 6, a groove 5A) at a part of the sole portion 2A or the side portion 2B. By providing the recess 6A and the cylindrical body 61) and adjusting the wall thickness, the position of the center of gravity can be easily changed appropriately. This thickness, unlike forging, can be easily reduced from the thinnest thickness to 2 mm or more. Further, it is possible to easily perform a design in which a groove or a ridge is provided on the surface of the sole portion 2A from the face or the face side toward the back side to force the swing direction. Further, it is possible to easily design such that a ridge is provided on the lower surface side of the sole portion 2A of the head main body portion 2 to reduce a ground contact area and improve slippage.

When the hosel portion 4 is provided separately, the hosel portion 4 can be formed by processing a forged or rolled plate into a cylindrical shape. According to such a forming method, it is difficult for defects to be formed inside, and particularly when a rolled material is used, the diameter of the shaft hole of the hosel portion 4 can be accurately processed. Further, when the head body 2 and the hosel 4 are made separately, there is an advantage that the lie angle and the face angle can be adjusted according to personal preference.

Although the crown portion 3 is formed by forging or rolling in any of the above-described embodiments, it can be formed by casting. Since the crown portion 3 has a small thickness, variations in individual deformation and shrinkage are likely to occur, and a forged material or a rolled material is preferable because it has better size and shape accuracy and is easier to handle. The thickness of the crown 3 is 0.5 to
It is preferably about 1.5 mm. If the thickness is too thin, the golf bag may fall down when transporting the golf club or the like, and the golf bag may be easily deformed. If the thickness is too thick, the entire head may not be easily enlarged, resulting in a high center of gravity. The reason why the crown 3 is formed separately from the head main body 2 is that the sole 2A and the side 2B of the head main body 2 have concave portions (in the embodiment, concave portions 6A).
This is because the workability is improved when the different weight members 7 are fitted into the concave portions of the hollow portions of the cylindrical body 61). Further, when a different kind of material is fixed to the concave portion by press-fitting or caulking, the work of screwing or welding inside the head using the concave portion becomes easy. Further, when the crown 3 and the hosel 4 are integrally formed by casting, a “s” is formed on the rising portion of the hosel 4 from the crown 3.
Is likely to occur, so it is necessary to make the hosel thick to have strength, the weight concentrates on the rising part,
Since the position of the center of gravity is not only closer to the hosel but also may be a negative factor in designing the center of gravity and increasing the volume of the head, the crown portion 3 is preferably formed separately.

FIG. 6 shows a cross section of the hosel part 4 integrally formed by casting together with the sole part 2A and the side part 2B.

As materials for forming each part, in addition to titanium and its alloys, stainless steel, maraging steel,
Duralumin, FRM and the like can also be used. The head of the present invention is suitable for a wood-type golf club head such as a driver and a fairway wood, but can also be applied to a head of a so-called utility club.

[0019]

As described above, according to the present invention, in a hollow golf club head having a metal outer shell, at least the face portion is formed by forging or pressing using a forged material or a rolled material, and The head, including the head part, the side part and the hosel part, or the head body part consisting of the sole part and the side part is formed by casting, and the crown part is made separately, and the face part, the head body part, and the crown part are fixed to each other. With such a structure, it is possible to easily design the head main body by casting, such as lowering the center of gravity, improving the slipping of the head, and improving the slip with respect to the ground. In addition, when dissimilar materials are provided on the sole portion or the side portion, it is easy to form a concave portion on the sole portion or the side portion because it is cast, and by inserting a weight into this concave portion, caulking, welding, screwing, etc. Can be fixed.
Also, when the hosel part of the head main body is formed by forging or pressing separately, it is possible to prevent `` s '' from easily forming from the crown part to the rising part of the hosel part,
It is no longer necessary to make the hosel thicker in order to have strength even if there is `` swelling '' as in the past, the weight is concentrated on the rising part, and the position of the center of gravity is closer to the hosel. Can be prevented.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a preferred embodiment of the present invention.

FIG. 2 is a central longitudinal sectional view in an assembled state.

FIG. 3 is an exploded perspective view showing another embodiment.

FIG. 4 is a view from below of the embodiment of FIG. 3;

FIG. 5 is a sectional view taken along line XX of FIG. 4;

FIG. 6 is a cross-sectional view showing an example in which the hosel portion is also integrally formed with the head body by casting.

FIG. 7 is an exploded perspective view showing a conventional example.

[Explanation of symbols]

 Reference Signs List 1 face part 2 head main body part 2A sole part 2B side part 3 crown part 4 hosel part

Claims (5)

[Claims] 1. A hollow golf club head having a metal outer shell, wherein at least the face portion is made of a forged material or a rolled material,
Forming by forging or pressing, molding the head body including the sole part, the side part and the hosel part or comprising the sole part and the side part by casting, and creating the crown part separately, A golf club head comprising a head body and a crown fixed to each other. 2. The golf club head according to claim 1, wherein the hosel portion is formed by forging or pressing separately from the head body portion. 3. The golf club head according to claim 1, wherein a concave portion and / or a convex portion are partially provided in a sole portion or a side portion of the head main body. 4. The head body according to claim 3, wherein a concave portion is formed in the sole portion or the side portion of the head main body portion, and a weight member having a higher specific gravity than the head main body is fitted and fixed in the concave portion. Golf club head. 5. The golf club head according to claim 1, wherein the face portion, the head body portion, and the crown portion are made of titanium or a titanium alloy.