阅读说明：本技术 高尔夫球杆杆头和其制造方法 (Golf club head and method of manufacturing the same ) 是由 荒牧知孝 于 2020-08-24 设计创作，主要内容包括：提供具有浅重心且低甜蜜点的设计自由度高的高尔夫球杆杆头和其制造方法。包括：准备具有底部(4)的一部分的第1、第2部件和内部配重物(20)的准备工序；将内部配重物固着在第1部件底部内表面侧的第1固着工序；和将第2部件固着在第1部件的第2固着工序。第1部件在底部内表面侧处具有台座部、在台座部和杆面(2)之间延伸的薄壁部。台座部被设置成可从第1部件的外部接近。台座部具有确定内部配重物在杆头上下方向z上的位置的第1定位部和确定内部配重物在杆头前后方向x或杆头趾-跟方向y上的位置的第2定位部。用第1和第2定位部确定内部配重物的位置,使其与薄壁部和杆面不接触、在薄壁部的上方向着杆面侧延伸。(Provided are a golf club head having a shallow center of gravity and a low sweet spot with a high degree of freedom in design, and a method for manufacturing the same. The method comprises the following steps: a preparation step for preparing a 1 st and a 2 nd members having a part of a bottom part (4) and an internal weight (20); a 1 st fixing step of fixing the internal weight to the 1 st member bottom portion inner surface side; and a 2 nd fixing step of fixing the 2 nd member to the 1 st member. The 1 st component has a pedestal portion, a thin portion extending between the pedestal portion and the face (2), at a bottom inner surface side. The stand portion is provided to be accessible from the outside of the 1 st component. The pedestal part has a 1 st positioning part for determining the position of the internal weight in the head up-down direction z and a 2 nd positioning part for determining the position of the internal weight in the head front-back direction x or the head toe-heel direction y. The position of the internal weight is determined by the 1 st and 2 nd positioners so as to extend above the thin wall portion toward the rod surface side without contacting the thin wall portion and the rod surface.)

1. A method of manufacturing a golf club head, wherein the golf club head has: a head main body including a crown portion, a face and a sole portion and having a hollow portion inside, and an internal weight disposed in the hollow portion,

the manufacturing method is characterized by comprising the following steps:

a preparation step of preparing a 1 st member having at least a part of the bottom portion, a 2 nd member fixed to the 1 st member, and the internal weight,

a 1 st fixing step of fixing the internal weight on a bottom inner surface side of the bottom portion of the 1 st member facing the hollow portion, and

a 2 nd fixing step of fixing the 2 nd member to the 1 st member to which the internal weight is fixed,

the 1 st part has, at the bottom inner surface side: a pedestal portion protruding toward the crown portion side, and a thin portion extending between the pedestal portion and the face and having a thickness smaller than that of the pedestal portion,

the pedestal portion is provided at a position accessible from the outside of the 1 st component,

the base unit has: a 1 st positioning part that determines a position of the internal weight in an up-down direction of the head, and a 2 nd positioning part that determines a position of the internal weight in at least one direction of a front-rear direction or a toe-heel direction of the head,

the 1 st fixing step includes the steps of:

a positioning step of positioning the internal weight with respect to the pedestal portion by the 1 st positioning portion and the 2 nd positioning portion so that the internal weight extends toward the rod surface side above the thin portion without contacting the thin portion and the rod surface, and

and an internal weight fixing step of fixing the internal weight and the pedestal portion to be positioned.

2. The method of manufacturing a golf club head according to claim 1, wherein the 2 nd positioning portion determines positions of the internal weight in both a head front-rear direction and a head toe-heel direction.

3. The method of manufacturing a golf club head according to claim 1 or 2, wherein the 2 nd positioning portion is a protrusion extending toward the crown portion side, and a through hole that receives the protrusion is formed in the internal weight.

4. The method of manufacturing a golf club head according to claim 3, wherein a height of the protrusion is smaller than a depth of the through hole.

5. The method of manufacturing a golf club head according to claim 3 or 4, wherein an annular gap having a V-shaped cross section is formed around the protrusion after the positioning step and before the internal weight fixing step.

6. The method of manufacturing a golf club head according to any one of claims 1 to 5, wherein the internal weight fixing step includes: and a step of forming a weld bead for fixing the internal weight between the 2 nd positioning part and the internal weight.

7. The method of manufacturing a golf club head according to claim 6, wherein,

the 2 nd positioning portion includes: a main 2 nd positioning portion where the weld bead is not formed and a sub 2 nd positioning portion where the weld bead is formed,

in the positioning step, an adjustment margin for positioning the internal weight by the sub 2 nd positioning portion is larger than that by the main 2 nd positioning portion.

8. The method for manufacturing a golf club head according to any one of claims 1 to 7, wherein the thickness of the thin portion is 0.9 to 1.5 mm.

9. The method of manufacturing a golf club head according to any one of claims 1 to 8, wherein the internal weight has a specific gravity greater than that of the head main body.

10. The method of manufacturing a golf club head according to any one of claims 1 to 9, wherein a length of the internal weight in a toe-heel direction is longer than a length in a front-rear direction of the head.

11. The method of manufacturing a golf club head according to any one of claims 1 to 10, wherein the internal weight has, at a side closer to the shaft surface than the pedestal portion: a bottom side convex portion extending toward the bottom side.

12. The method of manufacturing a golf club head according to any one of claims 1 to 11, wherein the 1 st part has the face formed with an opening.

13. The method of manufacturing a golf club head according to any one of claims 1 to 12, wherein the 1 st piece has the crown portion formed with an opening.

14. A golf club head, comprising: a head main body including a crown portion, a face and a sole portion and having a hollow portion inside, and an internal weight disposed in the hollow portion,

a pedestal portion protruding toward the crown portion and a thin portion extending between the pedestal portion and the face and having a thickness smaller than that of the pedestal portion are provided on a bottom inner surface side of the bottom portion facing the hollow portion,

the internal weight is fixed to the mount portion, does not contact the thin portion and the face, and extends above the thin portion toward the face side,

in the head main body, a 1 st member and a 2 nd member provided with at least the seat part are fixed together,

the pedestal portion is provided at a position accessible from outside of the 1 st member in a state before the 2 nd member is fixed to the 1 st member.

15. The golf club head of claim 14, wherein the shoe portion has: a 1 st positioning portion that determines a position of the internal weight in a head up-down direction, and a 2 nd positioning portion that determines a position of the internal weight in at least one of a head front-rear direction or a head toe-heel direction.

Technical Field

The present invention relates to golf club heads and methods of making the same.

Background

Among golf club heads having a hollow portion inside, a golf club head called a fairway wood or a hybrid club, which has a large chance of directly hitting a ball placed on the ground, needs to have a low sweet spot in order to obtain a large flight distance.

The following patent document 1 describes a fairway wood type golf club head. The golf club head includes: a metal body having a crown, a sole, a plug, a cavity, an opening, and a lip-shaped protrusion as an internal weight, and a metal face element having a ball striking face and a return portion.

[ Prior art documents ]

[ patent document ]

[ patent document 1] Japanese patent No. 5982555

Disclosure of Invention

[ problem to be solved by the invention ]

The golf club head of patent document 1 has such a problem: in order to obtain the lip-shaped protrusion, a combination of a metal body having a specific shape and a metal face member is required, and the degree of freedom in designing the shape of the golf club head, the protrusion (internal weight), and the like is low.

The present invention has been made in view of the above problems, and an object thereof is to provide a golf club head having a low sweet spot and a high degree of freedom in design, and a method for manufacturing the same.

[ MEANS FOR solving PROBLEMS ] to solve the problems

The present invention (invention of manufacturing method) is a method of manufacturing a golf club head, wherein the golf club head includes: the manufacturing method of the golf club head comprises the following steps: a preparation step of preparing a 1 st member having at least a part of the bottom portion, a 2 nd member fixed to the 1 st member, and the internal weight; a 1 st fixing step of fixing the internal weight to a bottom inner surface side of the bottom portion of the 1 st member facing the hollow portion; a 2 nd fixing step of fixing the 2 nd member to the 1 st member to which the internal weight is fixed, wherein the 1 st member includes, on the bottom portion inner surface side: a pedestal portion protruding toward the crown portion, and a thin portion extending between the pedestal portion and the face and having a thickness smaller than that of the pedestal portion, the pedestal portion being provided at a position accessible from outside the 1 st member, the pedestal portion including: a 1 st positioning part for determining a position of the internal weight in a head up-down direction, and a 2 nd positioning part for determining a position of the internal weight in at least one of a head front-rear direction or a head toe-heel direction, wherein the 1 st fixing step includes the steps of: a positioning step of positioning the internal weight with respect to the pedestal portion by the 1 st positioning portion and the 2 nd positioning portion so that the internal weight extends toward the rod surface side above the thin portion without contacting the thin portion and the rod surface; and an internal weight fixing step of fixing the internal weight and the pedestal portion to each other.

In another embodiment of the present invention, the 2 nd positioning portion may determine positions of the internal weight in both of a head front-rear direction and a toe-heel direction.

In another embodiment of the present invention, the 2 nd positioning part may be a protrusion extending toward the crown part, and the internal weight may have a through hole for receiving the protrusion.

In another embodiment of the present invention, the height of the protrusion may be smaller than the depth of the through hole.

In another embodiment of the present invention, an annular gap having a V-shaped cross section may be formed around the protrusion after the positioning step and before the internal weight fixing step.

In another embodiment of the present invention, the internal weight fixation step may include: and a step of forming a welding bead (welding bead) for fixing the internal weight between the 2 nd positioning portion and the internal weight.

In another embodiment of the present invention, the 2 nd positioning part includes: and a main 2 nd positioning portion where the weld bead is not formed and a sub 2 nd positioning portion where the weld bead is formed, wherein in the positioning step, an adjustment margin for positioning the internal weight by the sub 2 nd positioning portion may be larger than that by the main 2 nd positioning portion.

In another embodiment of the present invention, the thickness of the thin portion may be 0.9 to 1.5 mm.

In another embodiment of the present invention, the internal weight may have a specific gravity greater than that of the head main body.

In another embodiment of the present invention, the internal weight may be configured such that the length of the internal weight in the toe-heel direction is longer than the length of the internal weight in the front-rear direction.

In another embodiment of the present invention, the internal weight may include, on the side closer to the rod surface than the base portion: a bottom side protrusion extending toward the bottom side.

In another embodiment of the present invention, the 1 st member may have the face with an opening formed therein.

In other embodiments of the present invention, the 1 st member may have the crown portion formed with an opening.

Further, the present invention (product invention) is a golf club head having: the present invention provides a head including a crown portion, a face, and a sole portion, the head including a hollow portion therein, and an internal weight disposed in the hollow portion, wherein a pedestal portion protruding toward the crown portion and a thin portion extending between the pedestal portion and the face and having a thickness smaller than that of the pedestal portion are provided on an inner surface side of the sole portion facing the hollow portion, the internal weight is fixed to the pedestal portion, does not contact the thin portion and the face, and extends toward the face side above the thin portion, and in the head, at least a 1 st member and a 2 nd member provided with the pedestal portion are fixed to each other, and in a state before the 2 nd member is fixed to the 1 st member, the pedestal portion is provided at a position accessible from outside the 1 st member.

The base unit may include: a 1 st positioning part for determining the position of the internal weight in the head up-down direction, and a 2 nd positioning part for determining the position of the internal weight in at least one direction of the head front-back direction or the head toe-heel direction.

[ Effect of the invention ]

According to the method of manufacturing a golf club head of the present invention, a 1 st member having at least a part of a sole, a 2 nd member fixed to the 1 st member, and an internal weight are prepared (preparation step). Next, the internal weight is fixed to the bottom inner surface side of the 1 st member (1 st fixing step). Subsequently, the 2 nd member is fixed to the 1 st member (2 nd fixing step). Here, the 1 st member has, at the bottom inner surface side: the seat portion includes a seat portion protruding toward the crown portion side, and a thin portion extending between the seat portion and the face and having a thickness smaller than that of the seat portion, the seat portion being provided at a position accessible from outside of the 1 st component.

Therefore, in the 1 st fixing step, the base portion can be approached from the outside of the 1 st member without being obstructed by the 2 nd member, and the internal weight can be easily fixed to the base portion. This makes possible the use of internal weights of various shapes. Similarly, the member 1 may have various shapes if it includes a pedestal portion at a position accessible from the outside. Thus, the method for manufacturing a golf club head according to the present invention can provide a golf club head having a high degree of freedom in design.

Further, the pedestal portion has: a 1 st positioning part for determining the position of the internal weight in the head up-down direction, and a 2 nd positioning part for determining the position of the internal weight in at least one of the head front-rear direction or the head toe-heel direction. Then, the 1 st fixing step includes: a positioning step of positioning the internal weight with respect to the pedestal portion by the 1 st positioning portion and the 2 nd positioning portion so that the internal weight is extended toward the rod surface side above the thin portion without contacting the thin portion and the rod surface; and an internal weight fixing step of fixing the positioned internal weight and the pedestal portion.

Therefore, according to the method of manufacturing the golf club head of the present invention, the internal weight is positioned and fixed at a predetermined position on the sole inner surface side and the face side, and therefore, the center of gravity of the head can be made low and shallow. Thus, a golf club head having a low sweet spot can be manufactured with good productivity. Further, the internal weight does not contact the face and the thin wall portion, and therefore, deflection of the face and the thin wall portion at the time of a shot is not hindered, and further, there is no possibility that the rebound performance of the golf club head is lowered.

Similarly, the golf club head of the present invention includes: the head body includes a crown portion, a face portion, and a sole portion, and has a hollow portion therein, and an internal weight disposed in the hollow portion, wherein a pedestal portion protruding toward the crown portion and a thin portion extending between the pedestal portion and the face portion and having a thickness smaller than that of the pedestal portion are provided on an inner surface side of the sole portion facing the hollow portion, and the internal weight is fixed to the pedestal portion, does not contact the thin portion and the face portion, and extends above the thin portion toward the face side. Further, in the head main body, at least the 1 st member provided with the pedestal portion is fixed to the 2 nd member, and the pedestal portion is provided at a position accessible from the outside of the 1 st member in a state before the 2 nd member is fixed to the 1 st member.

Therefore, according to the golf club head of the present invention, the internal weight can be easily fixed to the pedestal portion of the 1 st member before the 1 st and 2 nd members are fixed together. This makes possible the use of internal weights of various shapes. Similarly, the member 1 may have various shapes if it includes a pedestal portion at a position accessible from the outside. Thus, the golf club head of the present invention can provide a high degree of freedom in design.

Further, according to the golf club head of the present invention, the internal weights are disposed on the sole inner surface side and the face side, and therefore, the center of gravity of the head can be made low and shallow. Thus, a golf club head having a low sweet spot may be provided. Further, the internal weight does not contact the face and the thin wall portion, and therefore, deflection of the face and the thin wall portion at the time of a shot is not hindered, and further, there is no possibility that the rebound performance of the golf club head is lowered.

Drawings

Fig. 1 is an oblique view of the golf club head of the present embodiment.

Fig. 2 is a plan view of the golf club head of fig. 1.

Fig. 3 is an exploded perspective view of the golf club head of fig. 1.

Fig. 4 is a sectional view taken along line IV-IV of fig. 2.

Fig. 5 is a cross-sectional view of V-V line of fig. 2.

FIG. 6 is a cross-sectional view of the V-V line of FIG. 2 before the internal weight is attached.

Fig. 7 is an exploded perspective view showing the table base and the internal weight.

Fig. 8 is a partial plan view of a state where the internal weight is positioned at the pedestal portion.

Fig. 9 is a sectional view for explaining the 1 st member and the internal weight in the 1 st fixing step.

Fig. 10 is a sectional view showing a modified example 1 of the head body.

Fig. 11 is a cross-sectional view (before fixing) showing the 1 st member and the internal weight in modification 1 of the pedestal portion and the internal weight.

Fig. 12 is a cross-sectional view (after fixing) showing the 1 st member and the internal weight in modification 1 of the pedestal portion and the internal weight.

Fig. 13 is a partial plan view showing the member 1 and the internal weight in modification 2 of the pedestal portion and the internal weight.

Fig. 14 is a cross-sectional view showing the 1 st member and the internal weight of another modification of the internal weight.

Fig. 15 is a sectional view showing a modified example 2 of the head main body.

[ notation ] to show

1 Golf club head

2 bar face

3 crown part

4 bottom

4i bottom inner surface

10 club head main body

20 internal counter weight

20A convex part

22 through hole

30 base part

31 st positioning part

32 nd 2 nd position fixing part

32a projection

40 thin wall part

100 part 1

200 part 2

301. 302, 303 open

321 main 2 nd positioning part

322 sub 2 nd positioning part

Bead B

i hollow part

Detailed Description

Hereinafter, one embodiment of the present invention will be described based on the drawings. In all the embodiments, the same elements are denoted by the same reference numerals, and redundant description thereof is omitted.

Fig. 1 to 3 show a perspective view, a plan view, and an exploded perspective view of a golf club head (hereinafter, may be simply referred to as "head") 1 according to the present embodiment. In fig. 1 to 3, the head 1 is in a reference state.

[ reference State, etc. ]

In this specification, the head 1 is in the reference state unless otherwise specified. The "reference state" means: the head 1 is placed in a state of a horizontal plane HP (fig. 2) at a lie angle and a loft angle determined by the head 1. More specifically, as shown in fig. 2, the reference state is a state in which the shaft axis line CL of the head 1 is disposed in the reference vertical plane VP, and is a state in which the head 1 is held at a predetermined lie angle and a predetermined loft angle. Further, the shaft axial center line CL is defined by an axial center line of a shaft insertion hole 6a formed in the plug 6 of the head 1.

[ coordinate System of club head ]

In this specification, in the head 1 in the reference state, a head front-rear direction x, a head toe-heel direction y, and a head up-down direction z are defined. The head front-rear direction x is a direction perpendicularly intersecting the reference vertical plane VP and parallel to the horizontal plane HP. The toe-heel direction y is a direction parallel to both the reference vertical plane VP and the horizontal plane HP. The head up-down direction z is a direction perpendicularly intersecting both the head front-back direction x and the head toe-heel direction y. In the head longitudinal direction x, the face 2 side is a front side, and the opposite side is a rear side.

[ basic form of head ]

The interior of the head 1 has a hollow i. The head 1 of the present embodiment is preferably a golf club head suitable for hitting a golf ball placed directly on the ground. Examples of such a head include a fairway wood club and a hybrid club. These heads typically have a loft angle α of 13 to 35 degrees, a head volume of about 100 to 200cc, and a head weight of about 190 to 240g, but are not limited to these.

Examples of the fairway wood include a third wood (#3), a fourth wood (#4), a fifth wood (#5), and other wood (#7, # 9). Further, a hybrid cue is known in the art as a cue having a shape intermediate a wood-type and iron-type cue heads, for example.

The head 1 has: a head main body 10 having a hollow portion i therein, and an internal weight 20 disposed in the hollow portion i.

The head main body 10 includes: the face 2, the crown 3, and the sole 4, which are arranged so as to define the hollow i, and the like. The hollow portion i may be filled with, for example, a gel for weight adjustment.

In the present embodiment, the face 2, the crown 3, and the sole 4 are made of, for example, a metal material. As the metal material, for example: stainless steel, maraging steel, titanium alloy, magnesium alloy or aluminum alloy. In other embodiments, a part of the head 1 (for example, the crown portion 3) may be made of a non-metal material such as a fiber-reinforced resin.

The face 2 is a member for hitting a golf ball, and is formed on the front side of the head 1. The outer surface (front surface) of the face 2 has a striking face which is a face that directly contacts a golf ball. Although not shown, a plurality of grooves called face lines extending in the toe-heel direction may be provided in the ball striking surface. The inner surface of the face 2 faces the hollow i.

The crown 3 extends rearward from the upper edge of the face 2, and its outer surface forms a head upper surface. The inner surface of the crown 3 faces the hollow i. On the heel side of the crown 3, a plug 6 is provided. The plug 6 is formed with a shaft insertion hole 6a for fixing a club shaft (not shown).

The sole 4 extends rearward from the lower edge of the face 2, and its outer surface forms a sole surface. The inner surface of the bottom 4, i.e., the bottom inner surface 4i faces the hollow i. As shown in fig. 3, a pedestal portion 30 for fixing the internal weight 20 and a thin portion 40 are provided on the bottom inner surface 4i side.

[ base part ]

Fig. 4 and 5 show sections of line IV-IV and line V-V of fig. 2, respectively. As shown in fig. 4 and 5, the pedestal portion 30, for example, protrudes from the sole inner surface 4i toward the crown portion 3 side (upward). In the present embodiment, the base portion 30 is provided on each of the toe side and the heel side of the sole inner surface 4 i. The number of the seat portions 30 may be arbitrarily determined, and for example, may be 3 or more, or conversely may be 1 piece continuous in the toe-heel direction. The pedestal portion 30 of the present embodiment is shown to be integrally formed with the bottom portion 4. In other embodiments, the base portion 30 may be formed by fixing another member (not shown) to the bottom portion 4. In either embodiment, the thickness of the pedestal portion 30 is measured as the distance in the head vertical direction z from the sole outer surface to the internal weight portion 20 described later.

[ thin wall portion ]

The thin portion 40 is formed to have a thickness smaller than that of the pedestal portion 30. The thin portion 40 extends between the pedestal portion 30 and the face 2. In the preferred embodiment, the thin-walled portion 40 is formed in a wider range in the toe-heel direction closer to the face 2 side than the pedestal portion 30. The thin portion 40 has a thickness smaller than that of the seat portion 30, and therefore, is easy to flex at the time of hitting a ball, contributing to improvement of the rebound performance of the club head 1.

Although not particularly limited, the thickness t of the thin portion 40 is, for example, 2.0mm or less, preferably 1.8mm or less, and more preferably 0.9 to 1.5mm in order to improve the rebound performance without impairing the durability of the head 1.

Although not particularly limited, the length L of the thin portion 40 in the front-rear direction of the head is, for example, 5.0mm or more, preferably 10.0mm or more. Accordingly, when the club head 1 strikes a ball, the region between the pedestal portion 30 of the sole 4 and the club face 2 can be significantly deflected.

[ internal counter weight ]

The internal weight 20 is a weight for positioning the center of gravity of the head 1 at a shallow and low position, and is made of, for example, a metal material. The internal weight 20 may be made of the same metal material as the pedestal portion 30. In another embodiment, the internal weight 20 may be made of a material (for example, an alloy containing a high specific gravity metal such as tungsten) having a higher specific gravity than the pedestal portion 30 (i.e., the bottom portion 4 in the present embodiment). This embodiment is preferable in terms of positioning the center of gravity of the head 1 at a shallower and lower position.

The internal weight 20 is fixed to the pedestal portion 30. In the present embodiment, the internal weight 20 is fixed to the pedestal portion 30 by welding, but other fixing means may be used.

In the interior weight 20 of the present embodiment, the length 20y in the toe-heel direction y is greater than the length 20x in the head front-rear direction x. Further, the internal weight 20 is: the length 20z in the head vertical direction z is smaller than the length 20x in the head front-rear direction. However, the internal weight 20 is not limited to the above embodiment.

The internal weight 20 is not in contact with the thin portion 40 and the face 2, and extends toward the face 2 side above the thin portion 40. In addition, not only in the reference state of the head 1, but also when the ball is hit by the face 2, a sufficient gap is opened so that the internal weight 20 does not contact the face 2.

Accordingly, the internal weight 20 is disposed on the sole inner surface 4i side and the face 2 side, and therefore, the head center of gravity can be made low and shallow. Thus, the head 1 having a low sweet spot can be provided. Therefore, when the club head 1 hits a ball placed directly on the ground, the hitting position is close to the sweet spot, and therefore, high rebound and low spin of the hit ball can be achieved, and the flight distance is increased. Since the internal weight 20 is disposed so as not to contact the face 2 and the thin portion 40, it does not interfere with the deflection of the face 2 and the thin portion 40 at the time of hitting a ball. Therefore, the internal weight 20 does not have a possibility of reducing the rebound performance of the head 1. Further, a soft material such as gel, impact absorbing material, impact sound absorbing material, or the like that does not prevent the thin portion 40 from being bent may be disposed between the internal weight 20 and the thin portion 40.

[ main body of club head ]

The head body 10 is formed by fixing together the 1 st member 100 and the 2 nd member 200 provided with at least the seat 30. In the present embodiment, the 2 nd member 200 is configured as a face plate, and the 1 st member 100 is configured as a portion remaining after the 2 nd member 200 is removed from the head body 10. Specifically, the 1 st member 100 includes: the crown 3, the sole 4, the plug 6, and the face peripheral portion 2E formed with the opening 301. That is, in the present embodiment, the head body 10 is of a so-called face-open type.

As is apparent from fig. 3, in a state before the 2 nd component 200 is fixed to the 1 st component 100, the pedestal portion 30 is provided at a position accessible from the outside of the 1 st component 100. In the present embodiment, the pedestal portion 30 can be accessed from the outside of the 1 st member 100 through the opening 301. In this specification, "may_……The approach means that the operator can visually confirm the pedestal portion 30 and can fix the internal weight 20 to the pedestal portion 30.

Therefore, according to the head 1 of the present embodiment, the interior weight 20 can be easily fixed to the pedestal portion 30 of the 1 st member 100 through the opening 301 of the 1 st member 100 before the 1 st member 100 and the 2 nd member 200 are fixed. This makes it possible to use various shapes of the internal balance weight 20 (in particular, shapes such as an undercut (down cut) formed between the internal balance weight and the thin-walled portion 40). Similarly, the member 1 may have various shapes if the pedestal portion 30 is provided at a position accessible from the outside. This embodiment can provide the head 1 having a high degree of freedom in design.

[ method of manufacturing a head ]

Next, an example of a method for manufacturing the head 1 of the present embodiment will be described. The manufacturing method of the present embodiment includes at least a preparation step, a 1 st fixing step, and a 2 nd fixing step.

[ preparation Process ]

In the preparation step, the 1 st member 100 having at least a part of the bottom portion 4, the 2 nd member 200 fixed to the 1 st member 100, and the internal weight 20 are prepared.

As shown in fig. 3, the 1 st member 100 is prepared as a member integrally including the crown portion 3, the sole portion 4, the plug 6, and the face peripheral portion 2E formed with the opening 301. Further, a pedestal portion 30 and a thin portion 40 are provided on the bottom inner surface 4i of the 1 st member 100. As described above, the pedestal portion 30 is provided at a position accessible from the outside of the 1 st member 100. In the present embodiment, the pedestal portion 30 of the 1 st member 100 can be accessed from the outside of the 1 st member 100 through the opening 301. Therefore, the operator can access the pedestal portion 30 through the opening 301 to perform the attaching operation and the fixing operation of the internal weight 20.

On the other hand, the above-described respective operations may be limited to a certain extent due to the size of the opening 301 and the like. In such a situation, it is desirable to easily determine the position of the internal counterweight 20 with respect to the table portion 30. Fig. 6 shows the pedestal portion 30 before the internal weight 20 is disposed, and fig. 7 shows an exploded perspective view of the internal weight 20 and the pedestal portion 30. As shown in fig. 6 and 7, a preferred embodiment of the present invention is a pedestal portion 30 including: a 1 st positioning portion 31 which determines the position of the internal weight 20 in the head up-down direction, and a 2 nd positioning portion 32 which determines the position of the internal weight 20 in at least one of the head front-rear direction or the toe-heel direction.

The 1 st positioning part 31 is constituted by, for example, an upper surface 31a of the pedestal part 30 located on the head upper side than the sole inner surface 4 i. The upper surface 31a of the seat portion 30 abuts against the lower surface of the internal weight 20, and further, determines the position of the internal weight 20 in the head vertical direction (downward restriction position).

The 2 nd positioning portion 32 preferably determines the position of the internal weight 20 in both the head front-rear direction and the toe-heel direction. Such a 2 nd positioning portion 32 is formed as, for example, a projection 32a extending from the 1 st positioning portion 31 (upper surface 31a) of the pedestal portion 30 toward the crown portion 3 side.

As shown in fig. 3, the internal weight 20 is prepared in a size that can be disposed inside the 1 st member 100 through the opening 301. As shown in fig. 7, the internal counterweight 20 of the present embodiment is formed with a through hole 22 extending in the head vertical direction z so as to receive a projection 32a as the 2 nd positioning portion 32 formed on the pedestal portion 30.

In the present embodiment, as shown in fig. 3, the 2 nd member 200 is prepared as a face plate to be attached to the opening 301 of the 1 st member 100.

[ 1 st fixing step ]

In the 1 st fixing step, the fixing of the internal weight 20 to the bottom inner surface 4i side of the 1 st member 100 is performed. The 1 st fixing step of the present embodiment includes: a step (positioning step) of positioning the internal counterweight 20 at a predetermined position with respect to the pedestal portion 30 by the 1 st positioning portion 31 and the 2 nd positioning portion 32 of the pedestal portion 30.

In the positioning step of the present embodiment, as shown in fig. 7, the internal weight 20 is positioned inside the 1 st member 100 and above the pedestal portion 30 through the opening 301. Then, the internal balance weight 20 is placed on the pedestal portion 30, and the 2 nd positioning portion 32 (projection 32a) of the pedestal portion 30 is inserted into the through hole 22 of the internal balance weight 20. Accordingly, the lower surface of the internal weight 20 abuts on the 1 st positioning portion 31 (the upper surface 31a of the pedestal portion) of the pedestal portion 30, and the head is positioned in the vertical direction.

The horizontal movement of the through hole 22 of the internal weight 20 is restricted by the 2 nd positioning portion 32 (projection 32a) inserted therein. Accordingly, the internal weight 20 is positioned in both the head front-rear direction and the toe-heel direction.

Fig. 8 is a partial plan view showing the member 1 and the internal weight 20 in a state where the internal weight 20 is positioned on the pedestal portion 30. As shown in fig. 8, the radius of the through-hole 22 is configured to be larger than the radius of the protrusion 32a by dr. Accordingly, the internal weight 20 has an adjustment margin for positioning of 2 × dr with respect to the base unit 30. Thus, in this specification, "position (fix.... position)" not only refers to an embodiment in which the positions are matched such that 2 parts cannot move at all, but also includes an embodiment in which the positions are matched such that relative movement of the 2 parts is allowed while being limited within a certain range. The latter, in particular, takes into account manufacturing tolerances of one or both components, etc.

Through the positioning process, as shown in fig. 9, the internal weights 20 are positioned such that: the thin portion 40 and the face 2 do not contact each other, and extends from the pedestal portion 30 toward the face 2 side above the thin portion 40.

Next, an interior weight fixing step of fixing the positioned interior weights 20 and the pedestal portion 30 is performed. In this step, the interior weight 20 and the pedestal portion 30 are fixed by various fixing means. This step can be performed through the opening 301. Examples of the fixing means include various fastening members such as screws, and adhesion, caulking, welding, and the like.

In the present embodiment, in order to obtain high bonding strength, a weld bead for fixing the internal weight 20 is formed between the 2 nd positioning portion 32 and the internal weight 20. Specifically, as shown in fig. 9, the welding wire WB or the irradiation laser beam is supplied from the opening 301 between the 2 nd positioning portion 32 and the through hole 22 of the internal weight 20. Accordingly, as shown in fig. 5, a weld bead B is formed between the 2 nd positioning portion 32 and the through hole 22 of the internal weight 20.

The weld bead B can be integrated with both the internal weight 20 and the pedestal portion 30 by melting them, for example. In another embodiment, the weld bead B may be fused only to the pedestal portion 30, for example. At this time, the bead B is preferably welded so as to mechanically fix (restrain) the internal weight 20 to the pedestal portion 30.

In another embodiment of the internal weight fixation step, a weld bead B may be formed between the internal weight and the 1 st positioning portion 31.

In order to efficiently perform the internal weight fixation step, it is preferable that an annular gap S having a V-shaped cross section be formed around the protrusion 32a after the positioning step and before the internal weight fixation step. Such a gap S contributes to: the molten metal is accurately and reliably filled between the 2 nd positioning portion 32 and the through hole 22, and poor welding between the two is suppressed. Such a gap S is provided by increasing the inner diameter of the through hole 22 of the internal weight 20 toward the crown portion 3 side, and/or tapering the protrusion 32a toward the crown portion 3 side, or the like.

In a preferred embodiment, as shown in fig. 9, the height of the projection 32a as the 2 nd positioning portion 32 is configured to be smaller than the depth of the through hole 22 of the internal weight 20 (the length of the hole in the head vertical direction). In such an embodiment, when the interior weight 20 is positioned on the pedestal portion 30, the protrusion 32a can be prevented from protruding upward from the interior weight 20. This helps not to fill the molten metal all around the projection 32 a. This is because, when the projection 32a projects upward from the internal weight 20, the welding workability may be deteriorated, for example, the welding rod may not reach the rear side of the projection 32a, which is not visually recognized from the opening 301.

[ 2 nd fixing step ]

After the internal weight fixation step, the 2 nd fixation step is performed. In the 2 nd fixing step, the 2 nd member 200 is fixed to the 1 st member 100 to which the internal weight 20 is fixed. In the present embodiment, as shown in fig. 5, a face plate as the 2 nd member 200 is fixed to the opening 301 of the 1 st member 100 by welding. As described above, the 2 nd fixing step can be performed from the outside of the head 1. Accordingly, the head 1 is manufactured.

According to the manufacturing method of the present embodiment as described above, the degree of freedom in design can be improved with respect to the shapes of the head main body 10 and the internal weight 20. For example, as can be understood from fig. 5: in the case of the face-open type head body 10, a space to be an undercut is formed between the internal weight 20 and the thin portion 40. Therefore, the internal weight 20 cannot be integrally formed on the 1 st member 100 side by casting in the face-open type head body. In contrast, the manufacturing method of the present embodiment has an advantage that the head 1 can be manufactured without restriction.

[ modification 1 of head body ]

The head body 10 is not limited to the face opening type shown in fig. 1 to 3. For example, as shown in fig. 10, the head body 10 may be of a crown opening type. The head body 10 integrally includes, as the 1 st member 100, a face 2, a sole 4, a plug 6 (not shown), and a crown peripheral portion 3E in which an opening 302 is formed. A pedestal portion 30 and a thin portion 40 are provided on a bottom inner surface 4i of a 1 st member 100. As described above, the pedestal portion 30 is provided at a position accessible from the outside of the 1 st member 100. In the present embodiment, the pedestal portion 30 of the 1 st member 100 can be accessed from the outside of the 1 st member 100 through the opening 302. In addition, in the 2 nd fixing step, the opening 302 is closed by fixing the crown cover as the 2 nd member 200.

In general, in the case of the crown-open type head body 10, since a space to be an undercut is formed between the internal weight 20 and the thin portion 40, such an internal weight 20 cannot be integrally molded on the 1 st member 100 side by casting. In contrast, according to the manufacturing method of the present embodiment, the head 1 can be manufactured without such constraints even for the crown-open type head body 10, and the degree of freedom in design is improved for the shapes of the head body 10 and the internal balance weight 20.

[ modification 1 of internal counterweight and pedestal portion ]

The pedestal portion 30 can be deformed into various shapes. For example, as shown in fig. 11, the pedestal portion 30 may be L-shaped in cross section. The pedestal portion 30 also has: a 1 st positioning part 31 which abuts against the lower surface of the internal weight object 20 and determines the position of the internal weight object 20 in the head vertical direction, and a 2 nd positioning part 32 which determines the position of the internal weight object in the head front-rear direction (more specifically, the head rear position). The 2 nd positioning portion 32 extends upward from the head rear side of the 1 st positioning portion 31.

In the preferred embodiment, when the internal weight 20 is positioned by the 2 nd positioning portion 32 of the pedestal portion 30, a gap S having a V-shaped cross section extending in the toe-heel direction is preferably formed between the 2 nd positioning portion 32 and the internal weight 20. As shown in fig. 12, this gap can be suitably used as a groove for filling molten metal, contributing to the formation of a preferred weld bead B.

[ modification 2 of internal weight and pedestal portion ]

Shown in fig. 13 are: a partial plan view showing another further modified example of the internal counterweight 20 and the pedestal portion 30 is shown. In this example, a plurality of 2 nd positioning portions 32 are provided, and at least one of them is a main 2 nd positioning portion 321 formed without a weld bead B for fixing the internal weight 20 to the pedestal portion 30. On the other hand, at least one of the other parts is the sub 2 nd positioning part 322 on which the bead B is formed.

In the positioning step, the sub-2 nd positioning unit 322 is configured to have a larger adjustment margin for positioning the internal weight 20 than the main 2 nd positioning unit 321. Therefore, in the positioning step, the main positioning portion 2 321 of the internal weight 20 is less likely to shake with respect to the base 30, and the positioning can be performed more accurately. On the other hand, in the internal weight fixation step, the molten metal can sufficiently flow into the sub-2 nd positioning portion 322 and the internal weight 20 by the relatively large gap (i.e., the adjustment margin). Therefore, according to this embodiment, the seat unit 30 can accurately position the internal weights 20 and can obtain a strong weld strength.

[ modification 3 of internal weight and pedestal portion ]

As shown in fig. 14, the internal weight 20 may have, at the face 2 side compared to the pedestal portion 30: and a bottom-side convex portion 20A extending toward the bottom 4. Bottom-side convex portion 20A extends downward from first positioning portion 31 of base portion 30. Such an internal weight 20 can distribute more weight to the lower position on the face 2 side of the head 1, and therefore, the center of gravity of the head 1 can be made shallower and positioned lower.

[ modification 2 of head body ]

For example, as shown in fig. 15, the head body 10 may be a cup-face type. The cup-face type head body 10 includes a rear head part as a 1 st member 100. The rear head portion integrally includes a crown portion rear portion 3a, a sole portion rear portion 4a, and a plug (not shown), and is formed with an opening 303 at the front portion. Further, a pedestal portion 30 is provided on the bottom inner surface 4i of the bottom rear portion 4 a. The pedestal portion 30 is provided at a position accessible from the outside of the 1 st component 100 (in this example, through the opening 303). The 2 nd component 200 includes a cup face including a face 2, a crown front portion 3b and a sole front portion 4b extending from the face 2 in the head rear direction.

In such an embodiment, it is difficult to form an undercut between the internal weight 20 and the thin-walled portion 40, as compared with the face-open type or crown-open type head body 10. However, for example, in the case of the internal weights 20 inclined downward toward the face 2 side or the internal weights provided with the bottom side convex portions 20A as shown in fig. 15, it is difficult to integrally mold the first member 100 by casting. In contrast, according to the manufacturing method of the present embodiment, even in the case of the cup-face type head body 10, there is no such constraint, and various internal weights 20 can be used, so that the degree of freedom in designing the internal weights 20 can be improved.

In the case of the cup-face type head body 10, the sole rear portion 4a and the sole front portion 4b need to be welded, and a weld bead needs to be formed in the welded portion, so that the thickness of the thin portion 40 is locally increased. On the other hand, in the face-open type or crown-open type head body 10, since such a welded portion is not present in the thin-walled portion 40, it is easy to make the thin-walled portion 40 thin, which is advantageous for improving the rebound performance. In addition, when the thin portion 40 is not provided with the welded portion, the degree of freedom in designing the thin portion 40 is also improved, and for example, a groove or a slit for promoting the flexure may be formed in the thin portion 40.

Although the present invention has been described in detail with reference to the embodiments, the present invention is not limited to the specific embodiments described above, and various modifications can be made to the embodiments. For example, the head body may be of an open-bottomed type. It goes without saying that 2 or more modifications may be combined.