Manufacturing method of golf club head

Abstract

To provide a method for manufacturing a golf club head by forging a wide area of ​​the club head using a plurality of materials when manufacturing the golf club head by forging using a plurality of materials. [Solution] In a manufacturing method for a golf club head processed by forging, the head is made up of a bottomed cylindrical material with an opening on only one end face, and a cylindrical material, the bottomed cylindrical material being used as a surface material and the cylindrical material being used as a core material, the core material being inserted through the opening of the surface material, with the end face of the core material being located further back than the opening, and a forging process is adopted.

Description

[Technical field]

[0001] The present invention relates to a method for manufacturing a golf club head, and more particularly to a technique for manufacturing a golf club head by forging using a plurality of materials. [Background technology]

[0002] Traditionally, golf club heads have often been made by casting, but forging is more suitable for producing them with high precision and quality. However, when forging is done using a single material, it is not possible to adjust the overall balance, and it is also difficult to adjust the properties. Furthermore, when attempting to use multiple materials over a large area during forging, the mixture of the multiple materials may vary from production to production, making it difficult to improve the quality of the club head. Therefore, there was a demand for a high-quality forging technology that could use multiple materials over a wide area of ​​the club head.

[0003] To address these problems, various techniques have been proposed in the past. For example, a method for manufacturing a golf club head (see Patent Document 1) has been proposed and is a publicly known technique. More specifically, the golf club head body is formed from a material body made of a malleable metal material and a different metal embedded in the material body. Depending on the material of the different metal and the embedded position, it is possible to achieve a low specific gravity and a low center of gravity.

[0004] However, according to the above technical proposal, a hole is simply drilled in a part of the material body and another material is embedded therein, and there is no mention of embedding another material in the entire material, so the problem is not solved. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2004-329335 A Summary of the Invention [Problem to be solved by the invention]

[0006] In view of the above problems, an object of the present invention is to provide a method for manufacturing a golf club head by forging multiple materials over a wide area of ​​the club head. [Means for solving the problem]

[0007] In order to solve the above problems, the present invention provides a method for manufacturing a golf club head by forging, comprising: a bottomed cylindrical material having an opening on only one end face; and a columnar material, the bottomed cylindrical material being used as a surface material and the columnar material being used as a core material; The surface material has an open end with a protruding portion protruding outwardly therearound, The core material is inserted from the opening of the surface material, and the end face of the core material is located on the inner side of the opening, and a forging process is performed.

[0008] The present invention also employs a means in which the golf club head is a hollow head having components constituted by a crown, a part of a sole, a neck and a face.

[0009] Furthermore, the present invention employs a method in which the thickness of the bottom portion of the surface material is in a ratio of 18% to 22% of the longitudinal length of the surface material, and the length from the opening of the surface material to the end of the core material is in a ratio of 9% to 11% of the longitudinal length of the surface material.

[0010] Furthermore, the present invention employs a means in which the volume of the core material is 26% to 40% of the total volume of the surface material and the core material.

[0012] Furthermore, the present invention employs a means in which the upper portion of the core material is recessed.

[0013] Furthermore, the present invention employs a means in which the surface material has a structure in which a plurality of bottomed cylindrical materials are stacked. Effect of the Invention

[0014] According to the method for manufacturing a golf club head of the present invention, when forging using multiple materials, it is possible to adopt a form in which one material is encompassed by another material over a wide area of ​​the club head, making it possible to produce a high-quality golf head. [Brief description of the drawings]

[0015] [Figure 1] 1 is an exploded perspective view of a golf club head manufactured by a manufacturing method according to the present invention; [Diagram 2] 5A to 5C are explanatory diagrams showing manufacturing steps of a manufacturing method for a golf club head according to the present invention. [Diagram 3] 10A to 10C are explanatory diagrams showing manufacturing steps in a modified example of the manufacturing method of the golf club head according to the present invention. [Figure 4] 10A to 10C are explanatory diagrams showing manufacturing steps in a modified example of the manufacturing method of the golf club head according to the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] The manufacturing method of the golf club head according to the present invention is characterized in that it is possible to perform high-quality forging using a plurality of materials. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a method for manufacturing a golf club head according to the present invention will be described with reference to the drawings.

[0017] The overall configuration and the configuration of each part of the method for manufacturing a golf club head according to the present invention are not limited to the embodiments described below, and may be modified as appropriate within the scope of the technical concept of the present invention, i.e., within the scope of shapes, dimensions, configurations, etc. that can achieve the same functional effects.

[0018] The present invention will be described with reference to FIGS. FIG. 1 is an exploded perspective view of a golf club head manufactured by a manufacturing method according to the present invention. FIG. 2 is an explanatory diagram showing the manufacturing steps of the manufacturing method of the golf club head according to the present invention, where (a) shows an example using two materials, and (b) shows an example using three materials. FIG. 3 is an explanatory diagram showing the manufacturing steps in a modified example of the method for manufacturing a golf club head according to the present invention, where (a) shows the case where a taper is added, (b) shows the case where a flange is added, and (c) shows the case where the top surface of the core material is recessed. FIG. 4 is an explanatory diagram showing the manufacturing steps in a modified example of the method for manufacturing a golf club head according to the present invention, where (a) shows the case where a screw-type lid is used, and (b) shows the case where a lid protruding around the bottom surface is used.

[0019] The present invention is a method for manufacturing a head portion of a golf club. An example of a hollow head that is mainly used for wood type golf clubs will be described, but iron type and wedge type heads can also be manufactured in the same manner. The hollow head golf club includes a golf club head 1 and a shaft connected to the golf club head 1. In this embodiment, the golf club head 1 is made up of two parts (two pieces). The golf club head 1 has a front side part 2 and a rear side part 3. The head front part 2 is composed of a crown and a part of the sole 11, a neck 12 and a face 10. The head rear part 3 is composed of the crown and a part of the sole 11, and the head front part 2 and the head rear part 3 are integrated by welding or the like to form the golf club head 1. Both the head front portion 2 and the head rear portion 3 have an extremely thin structure, and the technology for spreading a plurality of materials over a wide area is important. In this embodiment, the head front portion 2 will be described as an example.

[0020] The head front part 2 has a face 10 on the front side, which serves as the striking surface, a sole 11 on the bottom side, and a heel 12 on one side, and a neck 12 on the top of the heel 12, which serves as a shaft connection part, is erected obliquely upward, and the bottom end of the shaft is connected to a hole formed in the neck 12. The face 10 has multiple horizontal grooves called score lines or the like formed therein.

[0021] The front surface of the head front portion 2, including the face 10, is made of malleable metal having the strength to withstand impact, and the inside is made of malleable metal for adjusting the weight balance. Materials used include steel (SUS304 or S20C) and titanium alloy (6AL4V).

[0022] Next, the manufacturing method will be described. A plurality of types of materials are used as the metal material for forming the head front portion 2. One is the surface material 20, and the other is the core material 40. The surface material is a cylindrical material with a bottom. A blind hole with a specified diameter, width, and depth is formed on the top surface (or bottom surface). The material is a malleable metal material that has the strength to withstand impacts. When completed, it covers the entire golf club head 1. The core material 40 is a cylindrical material. It is made of a material different from the surface material 20 and has a different specific gravity, and is a part that sets the weight balance of the golf club head 1. The core material does not generally appear on the surface.

[0023] Although it depends on the head to be manufactured, for example, the outer diameter of the surface material 20 is 40 or 32 mm. The inner diameter (hole diameter) of the surface material 20 and the outer diameter of the core material 40 are about 25 mm, which is a dimension that allows the core material 40 to be press-fitted into the surface material 20. The thickness of the bottom of the surface material 20 is suitably 18% to 22% of the length of the surface material 20 in the longitudinal direction (axial direction), and is more preferably 20%. If it is too thin, it may break during forging, causing the core material to leak out, and if it is too thick, it is not possible to distribute the core material over a large area of ​​the club head.

[0024] As shown in Fig. 2(a), the core material 40 is inserted into the surface material 20. The inner wall of the surface material 20 and the outer wall of the core material 40 are in contact with each other. The insertion of the core material 40 is an operation similar to press-fitting. If the gap between the inner wall of the surface material 20 and the outer wall of the core material 40 is large, the core material and the surface material will be separated after forging, which will degrade the quality of the product.

[0025] The core material 40 is completely hidden inside the surface material 20. If a portion of the core material 40 is exposed, that portion may come out to the surface during forging, which may degrade the quality of the product. Therefore, the positional relationship between the opening 21 of the first surface material 20 and the end face of the core material 40 is specified. The end face of the core material 40 is set to be located on the rear side of the opening 21 by about 9% to 11%, and more preferably about 10%, of the longitudinal (axial) length of the surface material 20 (FIG. 2(a)). By adopting such a configuration, the opening 21, which is the end of the surface material 20, is crushed before the core material 40 flows out during forging, and it is possible to prevent the core material 40 from leaking out of the surface material 20.

[0026] The volume of the core material is preferably 26% to 40% of the total volume of the surface material and the core material. If it is less than a quarter, the effect of adding the core material is reduced, and if it is more than half, the strength characteristics of the surface material are reduced.

[0027] Next, the surface material 20 and the core material 40 are heated to a forging temperature in a furnace or the like. The heated material is forged by pressing it through multiple dies. Since forging involves pressing the material from all sides, the surface material deforms according to the mold, and the core material, while being partially affected by the deformation according to the mold, deforms internally into the desired shape without breaking the surface material. By this operation, the external shape of the head front portion 2 is formed, and similarly, the head rear portion 3 is formed and integrated by welding or the like. The face and other parts are then finished by forming horizontal grooves called scorelines and polishing the surface to complete the club.

[0028] In this way, by using a plurality of materials, it is possible to maintain the distinctive appearance while adjusting the specific gravity and weight of the head as a whole, thereby enabling the production of a higher quality head.

[0029] Furthermore, by changing the inner diameter of the surface material 20 and the outer diameter of the core material 40, it is possible to change the weight ratio of the surface material 20 to the core material 40. This makes it possible to adjust the specific gravity and weight of the head as a whole, and thus allows the manufacture of a higher quality head.

[0030] Next, a manufacturing method using a plurality of bottomed cylindrical materials will be described. A triple-structure golf club head 1 can be manufactured by disposing the intermediate material 30 between the surface material 20 and the core material 40. The intermediate material 30 has a shape of a cylinder with a bottom, similar to the surface material 20. The triple structure allows the weight balance and restitution coefficient of the entire golf club head 1 to be more finely adjusted and set.

[0031] In the manufacturing method, first, the surface material 20, the intermediate material 30, and the core material 40 are prepared. As shown in Fig. 2(b), the intermediate material 30 enters through the opening 21 of the surface material 20, and the core material 40 enters through the opening 31 of the intermediate material 30. The inner and outer walls are in contact with each other without any gaps. By eliminating gaps, the materials do not separate when completed, and the degree of completion can be improved. These materials are heated and forged by pressing them with multiple dies, after which the head front portion 2 and the head rear portion 3 are integrated by welding or the like, and finally a finishing process is performed to complete the golf club head 1. Because the product has three layers, the surface rebound force and the weight balance of the entire head can be fine-tuned, which is expected to improve product quality.

[0032] In the present invention, a core material is inserted into the surface material of a cylinder as a forging material. Since all of the core materials are located on the inner side of the opening, it is possible to prevent outflow. However, depending on the material of the core material, this may not be sufficient. Therefore, a structure capable of reliably preventing the core material from leaking out of the openings in the surface material will be described.

[0033] At the open end of the surface material 20 Outwardly protruding tapered protrusion 22 The shape after inserting the core material 40 is as shown in FIG. Tapered protrusion 22 By providing this, when pressed and molded in a mold, Tapered protrusion 22 is pressed and deformed first. Then, Tapered protrusion 22 Since the deformation of the core material 40 progresses faster than the deformation of the core material 40, the opening 21 can be closed before the core material 40 flows out of the opening 21.

[0034] At the open end of the surface material 20 Flange-like protrusion that protrudes outward The shape after the core material 40 is inserted is as shown in FIG. Flange-like protrusion By providing 22, when pressed and molded by a die, Flange-like protrusion 22 is pressed and deformed first. Then, Flange-like protrusion Since the deformation of 22 progresses faster than the deformation of the core material 40, the opening 21 can be closed before the core material 40 flows out of the opening 21. For tapers and flanges, in other words, the open end of the surface material protrude outward protrusion 22 This is the state where the perimeter is set up. protrude outward Due to the presence of the annular protrusion, the open end of the surface material 20 is crushed before the core material 40 starts to flow out, thereby preventing leakage of the core material 40.

[0035] As shown in Fig. 3(c), a recess is provided in advance in the upper surface portion 41 of the core material 40. After the core material 40 is inserted into the surface material 20, when it is pressed and deformed by a mold, the core material 40 flows out in the direction of the opening 21. However, since the upper surface portion 41 is recessed, the tip portion from which the core material 40 flows out is concave. This reduces the flow speed of the core material 40 as a whole, and as a result, it is possible to prevent the core material 40 from flowing out.

[0036] After inserting the core material 40 into the surface material 20, the opening 21 of the surface material 20 is closed with a lid 50 having a screw portion 51 (FIG. 4(a)). By closing the opening 21 with the lid 50 having the threaded portion 51, the core material 40 can be prevented from leaking out to the outside. First, the core material 40 is inserted into the surface material 20 . Next, the lid 50 is inserted into the opening 21. The lid 50 and the opening 21 are threaded, so that the lid 50 is screwed into the opening 21. When forging begins, the material is compressed from the surroundings. In response, the core material 40 inside tries to flow out toward the opening 21, but since it is blocked by the lid 50, the core material 40 does not flow out to the outside. The lid 50 can withstand the pressure of the core material 40 due to its screw structure.

[0037] After the core material 40 is inserted into the surface material 20, the opening 21 of the surface material 20 is closed with a lid 50 (FIG. 4(b)). The periphery of the bottom surface portion 52 of the lid 50 protrudes downward. The periphery of the top surface portion 41 of the core material 40 is cut to correspond to the bottom surface portion of the lid 50. First, the core material 40 is inserted into the surface material 20 . Next, the lid 50 is inserted into the opening 21. The periphery of the bottom surface portion 52 of the lid 50 protrudes downward, and the periphery of the top surface portion 41 of the core material 40 has a shape corresponding to the bottom surface portion of the lid 50, so that the bottom surface portion 52 of the lid 50 and the top surface portion 41 of the core material 40 abut against each other without any gaps. When forging begins, the material is compressed from the surroundings, and in response, the core material 40 inside tries to flow out in the direction of the opening 21. However, since the opening is closed by the lid 50, the core material 40 does not flow out to the outside. The lid 50 has a large contact area with the inner wall of the surface material 20, so that the contact resistance increases and the outflow of the core material 40 can be prevented.

[0038] Thus, according to the present invention, when forging a golf club head 1 using multiple materials, one material can be completely encompassed by the other materials, and the positions and specific gravities of the materials can be adjusted, allowing a high-quality golf club head 1 to be manufactured.

[0039] In addition, it is possible to combine three or more types of materials and completely enclose two or more types of materials with other materials, and it is possible to adjust the positions and specific gravity of the materials, so that a more precise and high-quality golf club head 1 can be manufactured.

[0040] Furthermore, by providing a lid 50 on the opening 21 of the surface material, providing a flange portion 22 on the surface material, or recessing the top surface portion 41 of the core material, it is possible to reliably prevent the core material from spilling out. [Industrial Applicability]

[0041] The manufacturing method of the golf club head according to the present invention can be employed as a manufacturing means for all kinds of golf club heads, including not only the manufacture of hollow heads mainly used for wood clubs, but also the manufacture of iron and wedge club heads, and is believed to have great industrial applicability as a quality improvement technology in forging using multiple materials. [Explanation of symbols]

[0042] 1. Golf club head 2 Front side of head 3 Rear side of head 10 Face 11 Sole 12 Neck 20 Surface material 21 Opening twenty two protrusion 30 Intermediate materials 31 Opening 40 Core material 41 Top part 50 lids 51 Screw part 52 Bottom part

Claims

1. In a method for manufacturing a golf club head by forging, It consists of a cylindrical material with an opening on only one end and a columnar material. The bottomed cylindrical material is a surface material, and the columnar material is a core material, The surface material has an open end with a protruding portion protruding outwardly therearound, The core material is inserted through the opening of the surface material; The end surface of the core material is located on the inner side of the opening, A method for manufacturing a golf club head, comprising the steps of:

2. 2. The method for manufacturing a golf club according to claim 1, wherein the golf club head is a hollow head having a component consisting of a crown, a part of a sole, a neck and a face.

3. 2. The method for manufacturing a golf club according to claim 1, wherein a thickness of the bottom portion of the surface material is in a ratio of 18% to 22% of a length of the surface material in a longitudinal direction, and a length from the opening of the surface material to an end of the core material is in a ratio of 9% to 11% of a length of the surface material in a longitudinal direction.

4. 2. The method for manufacturing a golf club according to claim 1, wherein the volume of the core material is 26% to 40% of the total volume of the surface material and the core material.

5. 2. The method of claim 1, wherein an upper portion of the core is recessed.

6. 6. The method for manufacturing a golf club according to claim 1, wherein the surface material has a structure in which a plurality of bottomed cylindrical materials are stacked.

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