JP2010274293A - Method for forging golf club head, and die therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for forging a golf club head capable of suppressing the amount of scraps, and reducing the heating time of a forging material and the cost required for the manufacturing process, and a die therefor. <P>SOLUTION: The forging method comprises: a forging material heating step of heating a forging material; a forging material-placing step of placing the heated forging material in a die having a space for communicating a cavity for forming an object by the forging of itself with the outer side: and a forge-rolling step of executing the plastic deformation of the forging material so as to be filled in the cavity of the die by applying the pressure to the forging material from the space. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

 The present invention relates to a forging method and a mold therefor, and more particularly to a method for forging a member such as a main body or a face plate in a golf club head and a die therefor.

The forging method is often used as a method for manufacturing a metal golf club head, in particular, a main body or a member such as a face plate.
Taking the manufacture of the face plate disclosed in Patent Document 1 as an example, first, after heating a metal material such as a bar to a predetermined temperature (600 to 800 ° C.), it is pressurized by a forging machine and plastically deformed into a flat plate shape. By preparing a flat plate as a forging material, and then further roughing the flat plate using a roughing die within the predetermined temperature range and finishing using a finishing die The current state of the forging manufacturing method of a metal golf club head is to form a target face plate or the like by performing forging pressure or the like.
According to this conventional forging manufacturing method, a flat plate material as a forging material is deformed by forging pressure so as to fill the rough die and the finishing die in order, and is gradually formed into a target product.

 However, whether it is rough forging pressure in the manufacturing process or finishing forging pressure, both are upper and lower molds, and by clamping the mold while applying pressure to the upper and lower surfaces (flat plate surface) of the flat plate material as the forging material The plate material as the forging material is plastically deformed and filled into the cavity that is being formed between the upper and lower molds, and the target product is molded. In addition to being thick, the entire volume must be slightly larger than the product, the heating time before forging of the forging material is more than necessary, and energy is wasted. Since the surplus of the material gradually radiates out from the joint surfaces of the upper and lower molds such as the roughing mold and the finishing mold, an annular burr is formed on the outer surface of the product or semi-finished product, and the final finishing process In addition, it is necessary to remove the annular burr as a waste product, and it is necessary to remove traces left on the surface of the product or semi-finished product by polishing, which wastes material use and costs for the manufacturing process. .

Japanese Patent Laid-Open No. 2004-202098

 In order to solve the above-mentioned problems, the present invention has an object to provide a forging method and a mold for the same that can reduce the amount of waste products and reduce the heating time of the forging material and the cost of the manufacturing process. And

 In order to achieve the above object, the present invention firstly communicates a forging material heating step for heating a forging material and a cavity for forming the object by forging the heated forging material to the outside. A forging material placing step for placing in a mold provided with a gap, and a forging pressure step for applying pressure to the forging material from the gap and plastically deforming the forging material so as to fill the cavity of the die. And a forging method characterized by comprising:

 As an embodiment of the forging method, a metal plate material is used as the forging material, and the die is composed of both upper and lower molds. When sandwiched from both sides, the gap between the cavity and the periphery of the cavity is formed between the cavity, and when the pressure is applied from the gap in the forging step, the forging material is The example which uses what can be plastically deformed so that it may fill in the said cavity is mentioned.

 Also, as a specific example of the mold, a forging mold composed of both upper and lower molds, the upper and lower molds are forged by sandwiching a metal plate material as a forging material from both upper and lower surfaces. A cavity for forming an object is formed, and the cavity is divided into an upper cavity formed in the upper mold and a lower cavity formed in the lower mold by the metal plate material, and a peripheral edge of the cavity Further, a portion near the cavity sandwiches the peripheral edge of the metal plate material, and a gap is formed where the other portion communicates with the outside, and the volume of the metal plate material sandwiched between the gaps is determined between the upper cavity and the lower cavity. Those configured to be approximately equal to the total volume may be mentioned.

According to the forging method and the use of the mold, first, the pressure application to the forging material is performed from the outside to the inside of the gap, particularly the gap formed between the upper and lower molds during clamping. The forging material does not protrude from the gap, does not become burrs on the surface of the product, and does not become a later waste product.
According to the forging method, since the forging material does not protrude from the gap during forging, it is not necessary to prepare a surplus portion. Since it is shared by the portion sandwiched between the molds, it is possible to use a material whose thickness is thinner than the target product and whose preheating time is greatly reduced.

It is a flowchart explaining the forging method of the face board in the golf club head which concerns on one Embodiment of this invention. It is drawing which shows the metal plate material used as a forge raw material in one Embodiment of this invention. It is sectional drawing explaining the forge raw material placement process in the forging method of the face plate which concerns on one Embodiment of this invention. It is sectional drawing explaining the forge pressure process in the forging method of the face board which concerns on one Embodiment of this invention.

Next, a method for forging a golf club head according to the present invention will be described with reference to FIGS.
First, as shown in FIG. 1, the golf club head forging method of the present invention comprises the following steps.

(A) Forging material heating step This step is a step of heating the prepared forging material to a predetermined temperature.
The forging material may be a metal material used for a conventional golf club head, but in the present embodiment, a rectangular metal plate 1 (see FIG. 2) made of 6-4 titanium (6-4Ti) is used. used.
The heating method may be a known technique or equipment (for example, a heating furnace) used for forging a conventional golf club head.
The heating temperature is determined by the design of the final product of the golf club head. In this embodiment, the face plate is manufactured with the metal plate material 1 made of 6-4 titanium. The temperature range was set.

(B) Placement process of forging material in mold with gaps This process is a process of placing the forging material (metal plate 1) heated in the heating process (A) in the following special mold 3.
As shown in FIG. 3, the special mold 3 is a mold having a gap 31 for communicating a cavity 30 for forming a target object by forging to the outside.
More specifically, the mold 3 is composed of both upper and lower molds as in the conventional forging mold, but the upper and lower molds 32 and 33 are formed on the upper and lower surfaces of the metal plate 1 as a forging material. When sandwiched between them, not only the cavity 30 but also the gap 31 is formed at the same time. As long as the mold is not opened, the gap 31 is present even if the molding of the face plate that is the object of manufacture is completed.
As shown in the figure, the upper and lower molds 32 and 33 sandwich the metal plate 1 as a forging material from both the upper and lower surfaces, and the cavity 30 formed therebetween is formed in the upper mold 32 by the metal plate 1. It is divided into an upper cavity 301 and a lower cavity 302 formed in the lower mold 33. In addition, the gap 31 formed between the peripheral portion of the cavity 30 is sandwiched between the peripheral portion 11 of the metal plate 1 and the other portion communicates with the outside of the mold 3.

In addition, the upper and lower molds 32 and 33 may be configured so that the volume of the metal plate 1 sandwiched between the gaps 31 is substantially equal to the total volume of the upper cavity 301 and the lower cavity 302. Since the degree is usually slightly increased by forging, the volume of the metal plate 1 sandwiched between the gaps 31 is preferably slightly larger than the total volume of the upper cavity 301 and the lower cavity 302.
Further, the shape of the mold 3, particularly the upper cavity 301 and the lower cavity 302, the depth and the position of the entire mold, the arrangement of the gap 31, and the like can be designed according to the design of the target product.
For example, as shown in the figure, when the face plate of this embodiment is forged, the mold 3 becomes rectangular when the mold is clamped, and the gap 31 is formed only on a pair of opposing sides on the periphery of the rectangle. Is formed. That is, the upper and lower molds 32 and 33 come into close contact with each other on the other pair of opposing sides.

 Further, as shown in the drawing, the upper surface of the lower mold 33 is a flat surface, that is, the lower cavity 302 has no volume. Although there are a plurality of upper cavities 301, they are distributed near the center of the upper die 31 and their total volume is substantially equal to the volume of the metal plate 1 sandwiched between the gaps 31. However, as described above, in the actual forging process, the forged product is slightly increased in density by being subjected to pressure, so that the plurality of upper cavities 301 in the mold 3 of the present embodiment have their total volume. Is configured to be slightly smaller than the volume of the metal plate 1 sandwiched between the gaps 31.

As described above, when this step is performed, the rectangular metal plate 1 is sandwiched between the upper and lower molds 32 and 33 and the pair of opposing both sides is in the gap 31 on both sides of the mold 3. The edges of the gaps 31 open toward the opening of the gap 31 and the other pair of opposing sides stretches the both side walls of the upper and lower molds 32 and 33 at the edges.
However, the present invention is not limited to the above example, and the mold 3 may be circular or polygonal, and may be provided with a gap 31 on one side or a plurality of gaps 31.

(C) Forging pressure step of applying pressure from the gap This step is a step of plastically deforming the metal plate 1.
In this embodiment, the forged part (for example, the press part 2) is used in a temperature range of 350 to 500 ° C., and the pressure is averaged from the gaps 31 on both sides of the mold to the peripheral side surfaces 12 on both sides of the metal plate 1. The metal plate 1 is plastically deformed so as to fill the cavity 30 of the mold 3.
When the forging process is performed, the upper and lower dies 32 and 33 do not apply pressure so as to gradually approach as in the conventional forging method, but as described above, the peripheral edge of the metal plate 1 as a forging material without moving at all. While being sandwiched, the metal plate 1 is subjected to pressure from the gap 31 formed between them. That is, the pressure application in this step is performed through the gap 31 that is the only communication path between the cavity 30 formed between the upper and lower molds 32 and 33 and the outer side, so that the forging material passes through the gap 31. It does not stick out, does not become burrs on the surface of the product, and does not become waste afterwards. Therefore, according to the forging method and the mold 30 of the present invention, the amount of waste can be suppressed.

In addition, the forging method of the present invention is a method for making a thin forged material into a thick target product when using the metal plate 1 as a forged material, and it is not necessary to prepare a surplus of the forged material, Since the amount is less than that at all or not at all, the demand volume of the forging material is reduced as compared with the conventional amount. That is, when a product having the same purpose is manufactured, the heating step (A) is performed on a product whose volume and thickness are smaller than the conventional one. Therefore, the time of the heating process (A) before forging of the forging material can be greatly reduced as compared with the conventional method.
In the above, the present invention has been described by taking only the manufacture of a face plate in a golf club head as an example. However, the present invention is not limited thereto, and various products can be manufactured by designing the cavity 30 of the mold 3. .

 As described above, the forging method of the present invention and the mold for the same can reduce the amount of waste, and can reduce the heating time of the forging material and the cost of the manufacturing process, which is very advantageous for industrial use. It is.

DESCRIPTION OF SYMBOLS 1 Metal plate material 11 Peripheral part of metal plate material 12 Peripheral surface of metal plate material 2 Press part 3 Mold 30 Cavity 301 Upper cavity 302 Lower cavity 31 Crevice 32 Upper mold 33 Lower mold

Claims (8)

Forging material heating process for heating the forging material;
A forging material placing step in which the heated forging material is placed in a mold provided with a gap that communicates the cavity for forming the target object by forging itself;
Forging step of applying pressure to the forging material from the gap and plastically deforming the forging material so as to fill the cavity of the mold,
A forging method comprising the steps of: Using a metal plate as the forging material,
Further, the mold is composed of both upper and lower molds, and both the upper and lower molds sandwich the metal plate material from the upper and lower surfaces in the forging material placing step, and between the cavity and the peripheral edge of the cavity, A material that can plastically deform the forging material so as to fill the cavity when the gap is formed between the peripheral portions of the metal plate and pressure is applied from the gap in the forging pressure step is used. The forging method according to claim 1, wherein: As the mold,
The cavity is divided into an upper cavity formed in the upper mold and a lower cavity formed in the lower mold by the metal plate material,
Further, when the cavity and the gap are formed, the portion of the gap near the cavity sandwiches the peripheral edge of the metal plate material, the other portion communicates with the outside, and the volume of the metal plate material sandwiched by the gap is Approximately equal to the total volume of the upper cavity and the lower cavity;
The forging method according to claim 2, wherein a die is used.   When forging a face plate in a golf club head, as the die, the upper surface of the lower die is a flat surface, the lower cavity has no volume, and the upper cavity is a metal plate material whose volume is sandwiched between the gaps. 4. The forging method according to claim 3, wherein the one having a volume substantially equal to the volume is used.  The forging method according to claim 1, wherein the heating step is performed at a temperature of 700 to 1000 ° C.  The golf club head forging method according to claim 5, wherein the forging step is performed at a temperature of 350 to 500 ° C. 6. A forging die consisting of both upper and lower molds,
When both the upper and lower molds sandwich a metal plate material as a forging material from both the upper and lower surfaces, a cavity for forming an object by forging is formed between them,
The cavity is divided into an upper cavity formed in the upper mold and a lower cavity formed in the lower mold by the metal plate material,
Further, a gap is formed on the periphery of the cavity so that the portion near the cavity sandwiches the periphery of the metal plate, and the other portion communicates with the outside.
A forging die characterized in that a volume of a metal plate sandwiched between the gaps is substantially equal to a total volume of the upper cavity and the lower cavity.   A forging die for forging a face plate in a golf club head, wherein the upper surface of the lower die is flat, the lower cavity has no volume, and the upper cavity has a volume sandwiched between the gaps. The forging die according to claim 7, wherein the forging die is substantially equal to a volume of the metal plate material to be produced.

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