JP2665720B2 - Golf club head manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a golf club head manufacturing method.

[0002]

2. Description of the Related Art Conventionally, in order to finish a neck portion of a head material formed by forging or casting, first, a face portion,
While chucking the lathe on the basis of either the sole part or the neck part, hit the head material with a hammer etc. while rotating lightly to accurately align the axis of the neck part, and then press the end face of the neck part to the center The cylindrical surface is formed by cutting the outer peripheral surface of the neck part in the pressed state, and then the center is released from the end face of the neck part. Had been drilled.

[0003]

However, in the conventional method as described above, it takes a long time for the chuck to accurately adjust the position of the head with respect to the chuck using a hammer or the like. Also, since the head material is displaced with respect to the chuck due to the pressing force of the center pressing and the cutting resistance during cutting, when the center pressing is released from the end face of the neck, the axis of the cylindrical part and the lathe processing axis My mind is relatively displaced. Then, since the shaft insertion hole is formed as it is, the shaft insertion hole is displaced with respect to the axis of the neck portion, and there is a problem that uneven thickness occurs in the neck portion.

Further, it is conceivable to firmly chuck the head material so as to eliminate the displacement caused by the center pressing and the cutting resistance. However, it is extremely difficult to firmly chuck the head material having a variation in shape. It is.
Further, since it is necessary to adjust the drill with a hammer or the like in order to align the axis of the drill with the axis of the neck portion, a rigid chuck is not suitable.

Therefore, the present invention solves the above-mentioned problems, and can quickly perform chucking at the time of machining, and can accurately drill a shaft insertion hole along the axis of the neck portion. It is another object of the present invention to provide a golf club head manufacturing method capable of shortening a processing time.

[0006]

In order to achieve the above object, a method of manufacturing a golf club head according to the present invention is directed to a method of manufacturing a golf club head by cutting the outer peripheral surface of a neck portion of a head material formed by forging or casting. Then, an outer peripheral surface of the cylindrical portion is gripped by a chuck claw, and a shaft insertion hole is formed by a drill along the axis of the cylindrical portion.

Further, according to the method of manufacturing a golf club head according to the present invention, a center hole is recessed with a center drill at the center of the end face of the neck portion of the head material formed by forging or casting, and the center hole is formed in the center hole. In a state where the push is pressed, the outer peripheral surface of the neck portion is cut to form a cylindrical portion, and then, the outer peripheral surface of the cylindrical portion is gripped by a chuck claw, and the neck portion having the center hole is formed. The tip of the cylinder is cut off by a predetermined length. Thereafter, a shaft insertion hole is formed along the axis of the cylindrical portion by a drill while being held by the chuck pawl, and another drill is formed in a conical concave shape. The end face processing is performed.

[0008]

When a cylindrical portion is formed in a neck portion, a chuck with high precision is not required, so that the chuck can be quickly performed. Further, since the cylindrical portion formed in the neck portion has a uniform outer diameter, if the cylindrical portion is gripped by the chuck claws, the axis of the drill can be accurately aligned with the axis of the cylindrical portion.
If a shaft insertion hole is formed in the column in this state, the axis of the shaft insertion hole coincides with the axis of the column.

Further, if the outer peripheral surface of the neck portion is cut in a state where the center press is pressed into the center hole formed in the center of the end surface of the neck portion, the cutting accuracy is increased, and the outer diameter of the cylindrical portion is reduced. It can be finished uniformly. Furthermore, if the tip of the neck portion having the center hole is cut and removed by a predetermined length, the center hole is eliminated, and the displacement of the drill when drilling the shaft insertion hole can be prevented. And,
Conical concave end face machining with another drill can also be performed accurately.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings showing embodiments.

In FIG. 1, 1 is a head material of an iron type golf club head, 2 is a head portion, 3 is a face portion of the head portion 2, and 4 is a neck portion. The head material 1 is formed by casting, and the outer peripheral surfaces of the neck portion 4 are mutually formed.
Two parting lines P, P protrude along the longitudinal direction at positions opposite by 180 °.

A method of manufacturing a golf club head according to the present invention will be described below in the order of steps. First, as shown in FIGS. 2 and 3, a center drill 6 is attached to the center of an end face 5 of a neck portion 4 of a head material 1. The center hole 7 is recessed. Specifically, the neck portion 4 having the rough outer peripheral surface of the head material 1 is
The center drill 6 is cut into the end face 5 of the neck portion 4 while being held by a chuck (not shown), the center of the center drill 6 is aligned with the axis of the neck portion 4.

The center hole 7 thus drilled
Is, as shown in FIG. 3, a conical center pressing surface 8.
And a small-diameter relief hole 9 at the back.

In the above-described process, since the center hole 7 needs only to be formed in the neck portion 4 at a position where a cylindrical portion 13 to be described later can be formed, the accuracy of chucking the head material 1 has a certain tolerance. Therefore, chucking can be performed quickly.

Then, as shown in FIGS. 4, 5 and 6,
A portion close to a perfect circle at the base end portion of the neck portion 4 is chucked by the two-way claws 10, 10, and a center push 12 is pressed into the center hole 7 of the head material 1. Is cut to form a cylindrical portion 13. In addition, two-sided nail 10,10
Are provided with V-shaped escape grooves 11, 11 at the tip of the.
The head blank 1 can be quickly chucked by the center hole 7, the center push 12, and the two-side claws 10, 10.

Then, as shown in FIG.
The outer peripheral surface of the neck portion 4 is cut by the cutting tool 15 while the head blank 1 is rotated around the rotation center axis L by pressing the tapered tip end surface 14 of 12 to the center pressing receiving surface 8 of the center hole 7.

By performing the cutting process as described above, a cylindrical portion 13 having a predetermined length M is formed as shown in FIG. Then
In the cylindrical portion 13, the range of the predetermined length M 'actually cut has a uniform outer diameter with high accuracy.

Next, a cylindrical part having a high accuracy and a uniform outer diameter.
13 is gripped with another (two or three) chuck claws 18..., And as shown in FIG. Cut and remove by length N. That is, the center hole 7 is cut and removed so that the center hole 7 does not remain in the cylindrical portion 13 of the neck portion 4, and the (flat) end face 17 that is perpendicular to the axis L _{1 of} the cylindrical portion 13 with high precision is attached to the tip of the cylindrical portion 13. To form (At this time, since the cylindrical portion 13 is processed to have a uniform outer diameter, the outer peripheral surface thereof becomes an accurate processing reference surface.)

Then, as shown in FIG. 8 and FIG.
While bored axis L (shown in phantom) along the _first shaft insertion hole 20 of the cylindrical portion 13 by 19, subjected to end face processing in a separate drill 21 in a conical concave shape.

Specifically, as shown in FIG. 8, the outer peripheral surface of the cylindrical portion 13 of the neck portion 4 is held by the chuck claws 18.
Drill 20. At this time, since the cylindrical portion 13 is processed to have a uniform outer diameter, the outer peripheral surface becomes an accurate processing reference surface. Therefore, it is possible to match the axis of the axis L ₁ and the drill 19 of the cylindrical portion 13 very accurately.

Further, since ─── the end face 17 is a flat surface perpendicular to the axis L ₁ and the high-precision ─── i.e. center hole 7 of the cylindrical portion 13 is removed, the end face of the drill 19 When cutting into the hole 17, the shake of the drill 19 can be prevented.

[0022] Thus, the axis of the shaft insertion hole 20 can be matched exactly to the axis L ₁ of the cylindrical portion 13, the peripheral wall of the cylindrical portion 13, can be so uneven thickness does not occur (see FIG. 10 ). Therefore, the shaft can be attached to the golf club head manufactured by the method for manufacturing a golf club head at an accurate constant angle. In addition, it is possible to prevent variations in the strength of the neck portion.

Further, as shown in FIG. 9, while the outer peripheral surface of the cylindrical portion 13 is gripped by the chuck claws 18, 18,
Switching to another drill 21 having a tapered cutting edge 22 of a predetermined angle θ, the cutting edge cuts the opening edge of the cylindrical portion 13.

At this time, since the axis L ₁ of the cylindrical portion 13 exactly matches the axis of the shaft insertion hole 20, the cutting edge 22 of another drill 21 is cut into the opening edge of the cylindrical portion 13. In this case, it is possible to prevent the other drill 21 from blurring.

As a result, as shown in FIG.
Has the same angle θ ₁ as the predetermined angle θ and a predetermined angle θ _{2 with} respect to a line Y orthogonal to the axis L _1.
It is possible to form the inclined surface 23 that is only inclined. Then, the outer edge 24 of the inclined surface 23, at right angles with respect to the axis L _1.

After the above processing, the base end of the neck portion 4 and the head portion 2 are cut into a finished outer shape as shown by a virtual line in FIG. Further, through a series of steps such as a step of forming a plurality of grooves in the face portion 3 and a plating step, a golf club head as a product is completed.

According to the golf club head manufactured by the golf club head manufacturing method of the present invention, it is possible to prevent a variation in the mounting angle of the shaft with respect to the golf club head. That is, a golf club having constant performance without variation in the loft, lie angle and the like of the club can be manufactured.

In the above-described embodiment, the head material 1 is formed by casting, but may be formed by forging. Further, the present invention can be applied to not only a head material of an iron type golf club head but also a head material of a wood type golf club head (metal head).

Further, a process for forming a center hole 7 in the neck portion 4, a process for forming a cylindrical portion 13 by cutting the outer peripheral surface of the neck portion 4, and a process for cutting the end portion of the neck portion 4 by a predetermined length N machining and cutting removal, processing for performing end face processing in a separate drill 21 in a conical recess with along the axis L ₁ is bored a shaft insertion hole 20 of the cylindrical portion 13, respectively, drilling machine, lathe, milling machine, etc. May be performed using a plurality of machine tools, but it is also preferable to perform the series of processing using an NC machine, a turret lathe, or the like.

That is, in this case, the labor for transferring the head blank 1 to each machine tool can be omitted, and the time required for manufacturing can be further reduced. Furthermore, a plurality of head materials 1 can be processed simultaneously, and mass production becomes possible.

[0031]

Since the present invention is configured as described above, the following effects can be obtained.

According to the golf club head manufacturing method of the _{first aspect} , the shaft insertion hole 20 can be accurately formed along the axis L ₁ of the cylindrical portion 13 of the neck portion 4, and the neck portion 4 can be formed. It is possible to prevent uneven thickness from occurring on the peripheral wall. Therefore, the shaft can be attached at an accurate angle to the golf club head manufactured by the golf club head manufacturing method of the present invention, and variations in loft and lie angle can be eliminated. Further, a certain strength can be maintained.

Also, in the case of forming a shaft insertion hole 20 requiring high precision, the head material can be quickly and accurately chucked, and the processing time can be reduced.

According to the golf club head manufacturing method of the second aspect, the same effect as that of the first aspect is obtained. Also, an axial center L _{1 is provided} at the open end of the cylindrical portion 13 of the neck portion 4.
It is possible to form an inclined surface 23 which is inclined by a predetermined angle theta ₂ with respect to orthogonal lines Y, the outer edge 24 of the inclined surface 23,
It may be a right angles to the axis L _1.

As a result, the shaft is attached to the shaft attached to the golf club head manufactured by the golf club head manufacturing method of the present invention, and is in contact with the outer edge 24 of the inclined surface 23 of the neck portion 4. A gap can be prevented from being formed between the hosel to be attached and the outer edge 24,
A golf club with high commercial value can be manufactured.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of a head material.

FIG. 2 is an explanatory view of a step of forming a center hole in a recess.

FIG. 3 is a sectional view of a main part for explaining a center hole.

FIG. 4 is an explanatory diagram of a step of forming a column portion.

FIG. 5 is a cross-sectional side view showing a state where a neck portion is chucked.

FIG. 6 is a front view illustrating a column portion.

FIG. 7 is an explanatory diagram of a step of cutting and removing a tip portion of a cylindrical portion.

FIG. 8 is an explanatory view of a step of forming a shaft insertion hole in a cylindrical portion.

FIG. 9 is an explanatory view of a step of subjecting a cylindrical portion to end processing in a conical concave shape.

FIG. 10 is an enlarged sectional view of a neck portion.

FIG. 11 is a perspective view showing a head material after a neck portion is processed.

[Explanation of symbols]

Reference Signs List 1 Head material 4 Neck 5 End face 6 Center drill 7 Center hole 12 Center push 13 Cylindrical part 18 Chuck jaw 19 Drill 20 Shaft insertion hole 21 Another drill N Predetermined length L ₁ axis center

Claims (2)

(57) [Claims] An outer peripheral surface of a neck portion of a head material formed by forging or casting is formed to form a cylindrical portion.
Thereafter, a golf club, characterized in that the bored shaft insertion hole 20 along the axis L ₁ of the circular column portion 13 by the drill 19 by gripping the outer peripheral surface at the chuck claws 18 ... of the circular column portion 13 Head manufacturing method. 2. A center hole 7 is recessed by a center drill 6 at the center of an end face 5 of a neck portion 4 of a head material 1 formed by forging or casting.
In a state where the center portion 12 is pressed, the outer peripheral surface of the neck portion 4 is cut to form a cylindrical portion 13, and then the outer peripheral surface of the cylindrical portion 13 is gripped by chuck claws 18. 7 is cut and removed by a predetermined length N, and then along the axis L ₁ of the cylindrical portion 13 by a drill 19 while being held by the chuck claws 18. A method of manufacturing a golf club head, wherein a shaft insertion hole 20 is formed and an end face is processed by another drill 21 in a conical concave shape.