JP3486898B2 - Iron-type golf club 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 method for manufacturing an iron-type golf club in which a face is formed by forging and a shaft is connected to a head provided with a shaft mounting portion on one side.

[0002]

Golf clubs consist of a head and a shaft, and are generally classified into three types: wood, iron, and putter. Irons are classified according to the loft angle of the head (loft angle). Irons with a small loft angle (for example, 20 to 30 degrees) are called long irons, and irons with a large loft angle (for example, 40 to 50 degrees) are called short irons. Normally, irons are numbered from long irons to short irons, for example, 1 and 2.
No. 3, No. 4, No. 5, No. 5, No. 6, No. 7, No. 8, No. 9, No. PW
(Pitching wedge) etc.

The head of such an iron club (hereinafter referred to as "head") has a concave back on the front surface for hitting the golf ball (a cavity back iron) and a back. There is a smooth one (solid back iron). And
The face has an area called a sweet spot.

The head is generally manufactured by forging in terms of strength. The material of the conventional head is soft iron, and after forging the soft iron to form a head body, heat treatment is performed, and the surface is further processed by polishing or the like to obtain a product.

However, recently, in addition to soft iron, high-strength metal materials such as stainless steel, steel, titanium alloys and nickel alloys have been used for the purpose of high strength. On the other hand, the cavity-back forged iron head has a flat surface with a relatively small bottom surface of the cavity as in the past, but due to improvements in the mold, the bottom surface area has become wider and various designs with irregularities have been applied. There is also a deep undercut called undercut.

By the way, while a high-strength metal material can manufacture an excellent head, a high-strength metal material has high strength and low ductility even at high temperatures. And when trying to manufacture a head with such a high-strength metal material that has a wide and deep cavity and a versatile design by forging,
The metal material does not fully expand and becomes a state of lacking thickness that does not have a predetermined shape. In addition, there is a problem that cracking and deformation will occur when the shape is forced out.

[0007] In the conventional manufacturing of such a head by forging, forging is gradually performed by increasing the number of forging steps such as roll working, rough punching, middle punching twice, and top punching. Cracks and the like are likely to occur during forging by forming only by a forging process using a die, which not only increases the number of steps but also increases costs such as die cost. In particular, in the production of the iron head of the cavity back, it is possible to once form it into a shape substantially similar to that of the muscle back by forging, and then form the recess by machining, but in such a case, There is a problem that waste is great and that the number of mechanical processes is increased to finish a complicated shape.

Therefore, the present invention provides a method for manufacturing an iron-type golf club which solves the above problems and forms a head by using a metal material, in which the head is manufactured accurately and at low cost. The purpose is to provide.

[0009]

Means for Solving the Problems of claims 1 invention, stearyl
Stainless steel, titanium alloy, nickel alloy
In a method of manufacturing an iron-shaped golf club in which a shaft is connected to a head provided with a face on the front by forging, a recess on the back and a shaft mounting portion on one side, the raw material is processed by the previous forging process , The above
A method for manufacturing an iron-type golf club , comprising forming a recess-corresponding portion corresponding to the recess , cutting the recess-corresponding portion, and then performing a later forging step to form the head.

According to the structure of the first aspect, the concave portion can be formed by performing the cutting process in the middle of the front and rear forging steps.

According to a second aspect of the present invention, there is provided a method for manufacturing an iron-type golf club according to the first aspect, characterized in that after the latter-stage forging process, the latter-stage cutting process is performed on the recess.

According to the structure of the second aspect, it is possible to further process the recess by the latter-stage cutting process.

[0013]

Embodiments of the present invention will be described below with reference to the accompanying drawings. As shown in FIGS. 9 and 10, the iron-shaped golf club is composed of a head 1 and a shaft 2. The head 1 is made of a high-strength metal material such as stainless steel, titanium alloy, nickel alloy, etc. A face 3 which is a face, a sole 4 on a lower portion, a heel 5 on one side, a shaft mounting portion 6 for connecting the shaft 2 to the upper portion of the heel 5, a top 7 on the upper portion, and a further side on the other side Forming tow 8 respectively. Further, a recess 9 called a cavity is formed on the back surface of the head 1 so as to substantially face the face 3. The concave portion 9 has an upper peripheral surface 10 on an upper inner side of the inner rear body 9A, a lower peripheral surface 11 formed with a thickness h with the sole 4 on a lower inner side, and one peripheral surface on one inner side and the other side. 12 and the other side peripheral surface 13 are formed. Reference numeral 14 is a lateral groove formed on the face 3 and called a score line or the like. In addition, a laterally elongated small projection 15 is formed in the center of the rear body 9A for improving the aesthetics of the design. Further, a groove 16 is formed on the lower peripheral surface 11 near the rear body 9A from one peripheral surface 12 to the other peripheral surface 13.

Next, a method of manufacturing the head 1 will be described.
In the raw material step, a metal round bar (not shown) made of a high-strength metal material is cut into a predetermined length to form a raw material. Next, as shown in FIGS. 1 to 3, the head material 1A is formed from the raw material by the previous forging step. In detail, in this first-stage forging step, roll forging, roughing by one mold upper mold 15 and the other mold lower mold 16, and medium punching are performed to gradually expand the raw materials. Incidentally, 17 is a so-called burr formed during forging. In this first-stage forging process, the head 1 which is a finished product is obtained by processing the raw material by forging.
3A corresponding to the face 3, sole 4, heel 5, shaft mounting portion 6, top 7, toe 8, and concave portion 9 respectively, sole corresponding portion 4A, heel corresponding portion 5
A, shaft mounting portion corresponding portion 6A, top corresponding portion 7A,
The toe corresponding portion 8A and the concave portion corresponding portion 9'are formed. The recess corresponding portion 9'includes an upper peripheral surface corresponding portion 10A, a sole corresponding portion 4A and a lower peripheral surface corresponding portion 11A having a thickness H on the inner upper side of the inner rear body corresponding portion 9'A, one side and the other side. The one side peripheral surface corresponding portion 12A and the other side peripheral surface corresponding portion 13A are formed on. The thickness H is formed larger than the thickness h.

Next, as shown in FIGS. 4 and 5, the head body 1A formed by the previous forging process is subjected to the cutting process in the previous period. The cutting process of the previous term specifically indicates cutting with a bite, milling, drilling, reaming, broaching, ultrasonic processing, etc. In the example, a shank type with cutting edges provided on the outer peripheral surface and the end surface. It shows the case of processing by the end mill A which is a milling machine, and the rear body corresponding portion 9'A and the lower peripheral surface corresponding portion 11A are cut to reduce the thickness of the face corresponding portion 3A and the rear body cutting surface 9'B, and the lower peripheral cutting surface 11B is formed so as to reduce the thickness of the sole corresponding portion 4A. The lower peripheral surface-cutting surface 11B is dug to form an undercut shape. That is, the thickness h between the sole-corresponding portion 4A and the lower peripheral cutting surface 11B is formed to be substantially the same on the rear body cutting surface 9'B side and the tip 11Z side, or the thickness h is set to the rear body cutting surface 9B. The B side is formed to be smaller than the tip 11Z side.
In addition, the flash 17 is cut off at the same time as this cutting step, and the small projection corresponding portion 15A is cut on the rear body cutting surface 9 '.
Form B.

After the cutting process is performed in this manner, a later forging process is performed. The latter forging step is performed by the upper mold 18 as one mold and the lower mold 19 as the other mold as the other mold in detail, as shown in FIGS. 6 and 7.
The head 1 is formed by extending 1A little by little. The lower die 19 which is the other die of the latter forging process is formed in an undercut shape by engraving the lower peripheral surface cutting work surface 11B, so that a plurality of divided dies are formed. It may be formed by.

After the head 1 is formed by the late forging process in this way, the groove 16 is formed by the late cutting process on the lower peripheral surface machined surface 11B toward the rear body main body machined surface 9'B as shown in FIG. Form. This latter-stage cutting process shows, in detail, machining with a cutting tool, milling, drilling, reaming, broaching, ultrasonic machining, etc.In the example, a shank type with cutting edges provided on the outer peripheral surface and the end surface is used. It shows a case of processing with an end mill B which is a milling machine. The diameter of the end mill B is smaller than that of the end mill A.

After that, a finishing process is performed. In the finishing process, deburring, surface polishing, formation of the lateral groove 14, formation of a hole 20 into which the lower end of the shaft 2 is inserted at the shaft center of the shaft attachment portion 6 as shown in FIG. .

As described above, in the above-described embodiment, the iron-type golf club manufacturing method in which the shaft 3 is connected to the head 1 provided with the face 3 on the front side and the shaft mounting portion 6 on one side by forging, After the previous forging process by the upper die 15 and the lower die 16, the rear body corresponding portion 9'A and the lower peripheral surface corresponding portion 11A are cut by the end mill A, and then by the upper die 18 and the lower die 19. By performing the latter-stage forging step, the rear body 9A and the lower peripheral surface 11 can be formed without forging. Therefore, such a portion can be accurately formed by cutting the portion that is difficult to form by using the mold in the middle of the former forging step and the latter forging step. Moreover, the grain flow line can be secured by performing the latter-stage forging step after cutting.

Further, by forming the concave portion 8 called a cavity by the above cutting process, it is possible to surely and accurately process a difficult-to-process portion.
In particular, an undercut shape or the like can be easily formed by cutting the lower peripheral surface 11 of the recess 8. Further, the thickness of the face 3 can be reduced by cutting the back body 9A.

Moreover, by performing the cutting process with the end mill A, the back surface main body corresponding portion 9'A and the lower peripheral surface corresponding portion 10A inside the concave portion corresponding portion 8A can be formed reliably and accurately.

Further, after the latter-stage forging process, the lower peripheral surface-machined surface 11B of the recess 9 is subjected to the latter-stage machining by the end mill B to form the groove 16,
The center of gravity of the head can be located further back to expand the sweet area.

Further, even if the material of the head body 1 is a high-strength metal material such as stainless steel, steel, titanium alloy nickel alloy, etc. in particular, it is formed by the former forging process, the former cutting process, and the latter forging process. For example, as described above, the lower peripheral surface 11 may be formed into an undercut to have a free shape. Moreover, by adding the latter cutting step, it is possible to form a more free shape such as forming the groove 16 as described above.

The present invention is not limited to the above embodiment, and various modifications can be made within the scope of the present invention. For example, the upper peripheral surface corresponding portion 9 of the recess 8
A, the one side peripheral surface corresponding portion 12A and the other side peripheral surface corresponding portion 13A may be processed by cutting.

[0025]

According to the invention of claim 1 , stainless steel, titanium
In a method of manufacturing an iron-type golf club in which a shaft is connected to a head that is made of a nickel-based alloy or a nickel-based alloy and has a face on the front and a recess on the back and a shaft mounting portion on one side by forging. , The raw material is processed in the previous forging process, and the
A method for manufacturing an iron-shaped golf club, characterized in that the head is formed by cutting the concave portion corresponding portion after forming the portion corresponding portion, and then performing the latter forging step after this. By performing the cutting process in the middle of the process, the concave portion can be formed accurately and at low cost.

[0026] According to a second aspect of the invention, after the late forging step, and carrying out late cut into the recess 請
A method for manufacturing an iron-type golf club according to claim 1 ,
It can be further free shape the shape of the recess.

[Brief description of drawings]

FIG. 1 is a perspective view of a first-stage forging process showing an embodiment of the present invention.

FIG. 2 is a sectional view of a first forging step showing an embodiment of the present invention.

FIG. 3 is a front view of a first-stage forging process showing an embodiment of the present invention.

FIG. 4 is a perspective view of a cutting process showing an embodiment of the present invention.

FIG. 5 is a cross-sectional view of a cutting process showing an embodiment of the present invention.

FIG. 6 is a perspective view of a late forging process showing an embodiment of the present invention.

FIG. 7 is a cross-sectional view of a second stage cutting process showing an example of the present invention.

FIG. 8 is a sectional view of a late forging step showing an embodiment of the present invention.

FIG. 9 is a perspective view of a finished product showing an embodiment of the present invention.

FIG. 10 is a front view of a completed product showing an embodiment of the present invention.

[Explanation of symbols]

1A head body 2 shafts 3 faces 6 Shaft mounting part 9 recess 14 15 18 19 Mold AB end mill

Continuation of the front page (56) Reference JP-A-11-70191 (JP, A) JP-A-10-234897 (JP, A) JP-A-9-38252 (JP, A) JP-A-10-216277 (JP , A) JP 10-155942 (JP, A) JP 10-15125 (JP, A) JP 7-265473 (JP, A) JP 8-276040 (JP, A) JP 11-178960 (JP, A) (58) Fields surveyed (Int.Cl. ⁷ , DB name) A63B 53/00-53/16 B21J 1/00-13/14 B21J 17/00-19/04 B21K 1 / 00-31/00

Claims (2)

(57) [Claims] 1. Stainless steel, titanium-based alloy, nickel
In the method of manufacturing an iron-shaped golf club in which the shaft is connected to the head that is made of any of the alloys and has a face on the front and a recess on the back and a shaft mounting part on one side by forging, the raw material is forged in the previous period. Processed by a process to form a recess-corresponding portion corresponding to the recess.
A method for manufacturing an iron-shaped golf club, characterized in that the head is formed by subsequently cutting the recess-corresponding portion and then performing a later forging step. 2. The method for manufacturing an iron-type golf club according to claim 1 , wherein after the latter-stage forging step, the latter-stage cutting process is performed on the recess.