TW201511796A - Manufacturing method of steel golf head with active metal - Google Patents

Abstract

A manufacturing method of steel golf head with active metal is presented to improve the conversion ratio of casting material and casting product. This manufacturing method comprises: positioning a shell mold on a rotary platform, with the rotary platform connects to a rotation axis; putting a steel ingot with active metal into a crucible portion of the shell mold, and melting the steel ingot in a vacuum environment; driving the rotation axis to linking-up the rotary platform rotates, and make metal liquid flow into a mold cavity portion of the shell mold; stop rotating slowly and taking the shell mold from the rotary platform; destroying the shell mold then get a casting product.

Description

Method for manufacturing steel golf club head containing active metal

The present invention relates to a method of precision casting a golf club head, and more particularly to a method of precision casting a steel golf club head containing an active metal.

Generally speaking, golf clubs can be divided into three categories: wood poles, irons and putters. Early wood heads and iron heads are made of stainless steel or carbon steel. In order to improve the functionality of the club head, in recent years, Various new steel casting materials have been continuously developed and used to make golf club heads. On the other hand, golf club heads are mostly made by precision casting, and most of the current precision castings are carried out in the atmosphere. The high-frequency induction furnace (High Frequency Induction Furnace) is used to rapidly melt the steel ingots. It is cast with static gravity.

However, since steel alloys which improve the functionality of the club head often contain active metals that easily react with oxygen in the atmosphere (for example, manganese, aluminum, lanthanum, cobalt, titanium, etc.), it is easy to smelt steel-based metals. In the process of ingot, the violent oxidation reaction with oxygen not only causes the difficulty of melting, but also leads to the formation of a large number of casting defects such as slag holes or reaction pores on the golf club head casting after casting; Oxidation reaction also causes the fluidity of the molten metal in the shell mold to decrease, which is liable to cause a decrease in the molding yield of the golf club head casting due to insufficient casting, or a problem of cold lock (Cold Shut) in the golf club head casting. A gap is formed in the middle. In addition, when the steel ingot to be smelted contains chromium, although the degree of oxidation reaction of the chromium with the atmosphere during the smelting process is not as high as the active metal having the higher oxidizing power, the molten metal containing chromium enters the cavity. It is easy to react with the surface layer of the shell mold to form zirconium dioxide and iron oxide, which will also cause golf. Defects on the surface of the club head casting.

In order to solve the above problem, when the steel casting material for manufacturing the golf club head contains active metal, the melting process is usually selected in a vacuum environment, and the vacuum casting which is commonly used in the industry generally includes vacuum arc melting ( Vacuum Arc Melting) and Induction Skull Melting; however, whether it is vacuum arc melting or induction shell melting, water-cooled copper crucibles are used in the melting process as a molten material for steel castings. However, the water-cooled copper crucible reduces the degree of superheat of the metal, so that the molten metal liquid is solidified again on the inner surface of the water-cooled copper crucible, and a shell having a thickness (so-called "crust") is formed, so that the steel The proportion of castings converted into golf club head castings is reduced, and waste of casting materials is formed, which makes it difficult to reduce casting costs, especially when steel castings contain relatively expensive components such as nickel or cobalt, how to improve castings and castings. The conversion ratio between them has become an issue that needs improvement.

The object of the present invention is to provide a method for manufacturing a steel golf club head containing active metals, which can avoid the violent oxidation reaction of the molten metal, and can improve the conversion ratio between the casting material and the casting, and avoid waste of the casting material. Effectively improve golf club head casting yield and reduce casting costs.

In order to achieve the foregoing objective, the technical content of the present invention includes: a method for manufacturing a steel golf club head containing an active metal, comprising: positioning a shell mold on a rotating platform, the shell mold comprising communicating a ram portion and a cavity portion, and the rotating platform is coupled to an axially rotatable shaft; a steel metal ingot containing an active metal is placed on the crotch portion of the shell mold, and the steel is placed in a vacuum environment The metal ingot is heated and melted into a molten metal; the rotating shaft is driven to rotate the rotating platform to cause the molten metal liquid to flow into the cavity portion of the shell mold; the rotating shaft is slowly stopped, and the cast shell mold is removed; The shell mold is broken to obtain a golf club head casting.

Wherein, the steel ingot may be an iron-based material containing manganese (Mn), aluminum (Al) or bismuth (Si), the steel ingot has an iron content of more than 50%, and the steel ingot has a density of 6.5. ~7.5 g/cm ³ ; for example, the steel-based metal ingot may contain 5.0 to 35% by weight of manganese, or the steel-based metal ingot may contain 6.0 to 12% by weight of aluminum, or the steel The metal ingot may comprise from 3.0 to 5.5% by weight of bismuth.

Wherein, the steel ingot may be an iron-based material containing cobalt (Co), molybdenum (Mo) or titanium (Ti), the iron content of the steel ingot is greater than 50%, and the tensile strength of the steel ingot More than 250 ksi; for example, the steel-based metal ingot may comprise 5.0% to 15.0% by weight of cobalt, or the steel-based metal ingot may comprise 1.0% to 6.0% by weight of molybdenum, or the steel-based metal ingot Titanium may be included in an amount of 0.2% to 2.0% by weight.

Wherein, the steel ingot may contain 15 to 30% by weight of chromium (Cr), and the density of the steel ingot is 7.5 to 8 g/cm ³ .

The molding step of the shell mold comprises: preparing a wax embryo, the wax embryo comprising a embryo and a casting embryo, wherein the circumferential surface of the embryo is provided with a first connecting portion, and the casting embryo is provided with a second connecting portion The first connecting portion and the second connecting portion are integrally connected to each other; a coating layer is formed on the surface of the wax embryo; the wax embryo and the coating layer are heated to melt the wax; and the dewaxing is completed. The cladding layer is sintered at a high temperature to form the shell mold, and the shell mold has integrally connected crotch portions and cavity portions.

Wherein, the surface layer material of the shell mold may be a refractory material such as cerium oxide, diazepam or alumina.

The back layer material of the shell mold may be a mullite mixture, the content of the aluminum oxide is 45% to 60%, and the content of the cerium oxide is 55% to 40%. Alternatively, the backing layer material of the shell mold may be a cerium oxide mixture having a cerium oxide content of 95% or more.

Accordingly, the method for manufacturing the active metal-containing steel golf club head of the present invention can melt the molten metal in a vacuum environment, thereby avoiding a severe oxidation reaction of the molten metal, thereby improving The yield of the golf club head casting; at the same time, the molten metal liquid can be surely poured into the cavity of the shell mold by centrifugal force, so as to improve the conversion ratio between the casting material and the golf club head casting, and avoid waste casting. Material and reduce casting costs.

1‧‧‧vacuum furnace

11‧‧ ‧ room

12‧‧‧ Airway tube

13‧‧‧ openings

14‧‧‧ Cover

2‧‧‧ shaft

21‧‧‧ body

22‧‧‧Turning

23‧‧‧Abutment

3‧‧‧Rotating platform

31‧‧‧Axis joint

311‧‧‧Perforation

32‧‧‧ Positioning Department

32a‧‧‧坩埚Location Department

32b‧‧‧Acupoint Positioning Department

321‧‧‧With holes

322‧‧‧ 容容

4‧‧‧Shell mold

41‧‧‧坩埚

411‧‧‧ accommodating space

412‧‧‧First connecting tube

413‧‧‧ ring lip

42‧‧‧Move

421‧‧‧ cavity

422‧‧‧Second connection tube

5‧‧‧heater

6‧‧‧Wax embryo

61‧‧‧坩埚 embryo

611‧‧‧First connection

62‧‧‧ casting embryo

621‧‧‧Second connection

7‧‧‧Cladding

8‧‧‧ collar

M‧‧ motor

B‧‧‧ bearing

L‧‧‧ Lifting controller

P‧‧‧Steel ingots

N‧‧‧metal liquid

Fig. 1 is a schematic view showing the structure of a vacuum centrifugal casting apparatus used in conjunction with the present invention.

Fig. 2 is a partial perspective exploded view of the vacuum centrifugal casting apparatus used in conjunction with the present invention.

Figure 3: Schematic diagram (I) of the implementation of the present invention.

Fig. 4 is a schematic view showing the molding process of the shell mold of the vacuum centrifugal casting apparatus used in the present invention.

Figure 5: Schematic diagram (2) of the implementation of the present invention.

Figure 6: Schematic diagram (3) of the implementation of the present invention.

Figure 7 is a schematic view showing the structure of another vacuum centrifugal casting apparatus used in conjunction with the present invention.

The above and other objects, features and advantages of the present invention will become more <RTIgt; Please refer to Fig. 1, which is a vacuum centrifugal casting apparatus used in the method for manufacturing a steel-based golf club head containing an active metal of the present invention. Wherein, the vacuum centrifugal casting device comprises a vacuum furnace 1, a rotating shaft 2, a rotating platform 3, a shell mold 4 and a heater 5; the rotating shaft 2, the rotating platform 3, the shell mold 4 and the heater 5 are all disposed at In the vacuum furnace 1, the rotating platform 3 is coupled to the rotating shaft 2 for synchronous rotation with the rotating shaft 2. The shell mold 4 is positioned and placed on the rotating platform 3, and the heater 5 is used to heat the shell mold 4.

More specifically, the inside of the vacuum furnace 1 has a chamber 11 , and the vacuum furnace 1 can be provided with an air duct 12 , the air tube 12 is connected to the chamber 11 , and a vacuum controller (not shown) The chamber 11 can be evacuated through the air duct 12 according to a set value to control the The degree of vacuum of the chamber 11. In addition, the vacuum furnace 1 may further be provided with an opening 13 for the user to insert or remove the article into the chamber 11, and a cover 14 is provided to open and close the opening 13.

Referring to Figures 1 and 2, the shaft 2 is axially rotatably disposed in the chamber 11 of the vacuum furnace 1; in the present embodiment, the shaft 2 is connectable to the output of a motor M. The motor M drives the rotation. Moreover, the motor M can be selectively disposed outside the vacuum furnace 1, and one end of the rotating shaft 2 extends out of the vacuum furnace 1 to connect the motor M; the rotating shaft 2 can be placed in a bearing B, and the bearing B can be The connection is positioned in the vacuum furnace 1 to assist in improving the rotational stability of the rotating shaft 2, and preventing the yaw from occurring when the rotating shaft 2 rotates.

In addition, the portion of the rotating shaft 2 located in the chamber 11 can be divided into a body 21 and a rotation preventing portion 22, and the radial cross-sectional shape of the body 21 and the rotation preventing portion 22 are different to form an offset at the boundary between the two. a portion 23 for the rotating platform 3 to be coupled to the abutting portion 22 and abutting against the abutting portion 23, so that the rotating platform 3 can rotate synchronously with the rotating shaft 2; in the embodiment, the body 21 The radial section may be in the form of a circle. The rotation stop 22 may be disposed at the end of the rotating shaft 2, and the radial section of the rotation stop 22 is in a non-circular shape for the sleeve 3 to be coupled. The rotation stop portion 22 abuts against the abutment portion 23.

Referring to FIGS. 2 and 3, the rotating platform 3 is a carrier for positioning the shell mold 4, and the rotating platform 3 is provided with a connecting portion 31 and a positioning portion 32; in this embodiment, The shaft portion 31 can be provided with a through hole 311. The radial cross-sectional shape of the through hole 311 is matched with the radial cross-sectional shape of the rotation preventing portion 22 of the rotating shaft 2 for the rotating platform 3 to pass through the shaft portion. The through hole 311 of the sleeve 31 is connected to the rotation preventing portion 22 of the rotating shaft 2. The positioning portion 32 of the rotating platform 3 can be roughly divided into a positioning portion 32a and a cavity positioning portion 32b. The positioning portion 32a is located between the shaft portion 31 and the cavity positioning portion 32b, and the shaft is connected. The portion 31, the positioning portion 32a and the cavity positioning portion 32b are arranged according to the radial extension of the rotating shaft 2; further, the positioning portion 32a can be provided with a through hole 321 for a part of the shell mold 4 to extend through The cavity positioning portion 32b can be provided with a cavity 322 for accommodating another part of the shell mold 4.

Referring to FIGS. 2 and 3, the shell mold 4 has a crotch portion 41 and a cavity portion 42. The crotch portion 41 of the shell mold 4 can be positioned and placed on the crucible positioning portion 32a of the rotating platform 3. The cavity portion 42 of the shell mold 4 is then positionable on the cavity positioning portion 32b of the rotary table 3 such that the crotch portion 41 of the shell mold 4 is closer to the shaft portion 31 of the rotary table 3 than the cavity portion 42. .

The sill portion 41 can be formed in a cup shape to form an accommodating space 411 therein, and the accommodating space 411 can be used for accommodating the molten metal ingot P, and the circumferential surface of the dam portion 41 is separately provided. There is a first connecting tube 412 that communicates with the accommodating space 411. The cavity portion 42 is a portion for molding a golf club head. The shape of the cavity portion 42 is not particularly limited, and the inside of the cavity portion 42 has at least one cavity 421, and the shape and shape of the cavity 421 The golf club head to be cast is matched; the cavity portion 42 is further provided with a second connecting pipe 422, the second connecting pipe 422 is connected to the cavity 421, and the crotch portion 41 and the cavity portion 42 are A connecting tube 412 and a second connecting tube 422 are opposite to each other, so that the accommodating space 411 is in communication with the cavity 421.

Referring to FIG. 4, in the embodiment, the crotch portion 41 of the shell mold 4 and the cavity portion 42 may be integrally connected. The molding process of the shell mold 4 is: preparing a wax embryo 6, the wax embryo 6 includes an embryo 61 and a casting embryo 62. The circumferential surface of the embryo 61 is provided with a first connecting portion 611, and the casting embryo 62 is provided with a second connecting portion 621. The embryo 61 and the casting 62 are The first connecting portion 611 and the second connecting portion 621 are oppositely connected to each other. The wax blank 6 is subjected to a process such as dipping, sanding or grit, and a coating layer 7 is formed on the surface of the wax blank 6. The wax embryo 6 and the coating layer 7 are heated to melt the wax; for example, the wax embryo 6 and the coating layer 7 may be placed together in a steam autoclave to melt the wax embryo 6 to The coating layer 7 is discharged. The dewaxed cladding layer 7 is sintered at a high temperature to form the shell mold 4, and the shell mold 4 has an integrally joined crotch portion 41 and a cavity portion 42. Wherein, the surface layer material of the shell mold 4 may be selected from refractory materials such as cerium oxide, diazepam or alumina, and the back layer material of the shell mold 4 may be selected from mullite (3Al ₂ O ₃ -2SiO ₂ ) or two. Cerium oxide is used as a refractory material; further, when the back layer material is a mullite mixture, the content of the aluminum oxide is preferably 45% to 60%, and the content of the cerium oxide is preferably 55% to 40%; When the back layer material is a mixture of cerium oxide, the content of cerium oxide is preferably more than 95%.

Referring to FIGS. 1 and 3 again, the heater 5 is disposed in the chamber 11 of the vacuum furnace 1 for heating the crotch portion 41 of the shell mold 4. In this embodiment, the heater 5 can be selected as a high-frequency coil, and the heater 5 is moved by the lift controller L in the chamber 11; when the crotch portion 41 of the shell mold 4 is to be heated, The heater 5 can be driven up to a predetermined position to surround the outer circumference of the crotch portion 41, and the heater 5 is activated to heat the crotch portion 41. After the heating is completed, the heater 5 can be heated. The lift controller L is driven to descend so that the heater 5 no longer surrounds the outer circumference of the jaw portion 41 so as not to interfere with the rotation of the shell mold 4 with the rotating platform 3 and the rotating shaft 2.

According to the foregoing structure, the present invention can implement a method of manufacturing a steel-based golf club head containing an active metal, which comprises the following steps: Referring to Figures 1 to 3, a shell mold 4 is positioned and placed on a rotating platform 3, and the rotating platform 3 is coupled to an axially rotatable shaft 2. More specifically, the rotating platform 3 can be disposed in a vacuum furnace 1 to control the degree of vacuum of the space in which the shell mold 4 is located. In addition, the shell mold 4 includes a connecting portion 41 and a cavity portion. The shell mold 4 can be inserted into the through hole 321 of the rotating platform 3 by the dam portion 41, and the first connecting tube 412 of the dam portion 41 abuts against the rotating platform 3, and the shell mold 4 The cavity portion 42 can be placed on the cavity 322 of the rotating platform 3, so that the shell mold 4 can be stably fixed at a preset position on the rotating platform 3. And, a steel-based metal ingot P is placed in the crotch portion 41 of the shell mold 4, and the steel-based metal ingot P may be a steel-based material containing an active metal; for example, the following table is a manufacturing method in which the present invention can be implemented. Three kinds of steel materials, but not limited to this.

Table 1. Composition Table of Steel Metal Ingots of Each Example

As can be seen from the above table, the first embodiment and the second embodiment are iron-based materials containing aluminum (Al) or bismuth (Si) or manganese (Mn) having an iron content of more than 50% and a density of 6.8 g/cm. ³ , tensile strength is 145 ~ 155ksi, belonging to steel with low specific gravity (density of 6.5 ~ 7.8g / cm ³ ) characteristics; 〝 three examples, 〝 〝 〝 〝 〞 〞 〝 〝 〝 〝 〝 〝 An iron-based material of cobalt (Co) or molybdenum (Mo) or titanium (Ti) having an iron content of more than 50%, a density of 7.8 g/cm ³ , and a tensile strength of 250 to 275 ksi, and having a high strength (tensile strength) a steel-based material having a characteristic of more than 250 ksi; 〝Example 6 is an iron-based material having a high chromium (Cr) content, which contains 15 to 30% by weight of chromium, a density of 7.5 to 8 g/cm ³ , and tensile strength. The intensity is 90~110ksi.

Referring to Figures 1 and 5, the steel ingot P is heated and melted into a molten metal N in a vacuum environment. More specifically, after the housing mold 4 is positioned, the heater 5 can be driven up to a predetermined position to surround the outer circumference of the jaw portion 41; meanwhile, the air duct 12 of the vacuum furnace 1 can be directed The chamber 11 is evacuated to control the degree of vacuum of the chamber 11. After the vacuum degree reaches a preset value (for example, the degree of vacuum is less than 0.3 mbar), the heater 5 can be activated to heat the crotch portion 41 of the shell mold 4 so that the steel ingot P in the crotch portion 41 can be heated. Melting into a molten metal N; Wherein, when the heater 5 is actuated, the frequency of the power supply may be, for example, 4 kHz to 30 kHz, and the power is 5 kW to 100 kW. After the steel ingot P is melted into the molten metal N, the heater 5 stops acting and is rapidly driven down so that the heater 5 no longer surrounds the outer circumference of the weir portion 41.

Referring to Figures 1 and 6, the rotating shaft 2 is driven to rotate the rotating platform 3 to cause molten molten metal N to flow into the cavity portion 42 of the shell mold 4. More specifically, the spindle 2 can be driven by the motor M to produce an axial rotation having a rotational speed of about 200 rpm to 700 rpm, which can be adjusted according to the thickness of the golf club head casting (i.e., the size of the cavity 421). When the rotating platform 3 is interlocked and rotated about the rotating shaft 2, during the rotation, the molten metal N may be subjected to centrifugal force along the inner wall surface of the crotch portion 41 of the shell mold 4, through the shell mold. The first connecting pipe 412 and the second connecting pipe 422 of the fourth pipe 4 flow into the cavity portion 42 to perform a casting operation, thereby filling the cavity 421. After the casting is completed, the rotating shaft 2 can be stopped slowly, and the shell mold 4 is removed from the rotating platform 3, and the shell mold 4 is continuously broken to obtain the golf club head casting.

Therefore, in the method for producing a steel-based golf club head containing an active metal according to the present invention, the molten metal N can be surely poured into the cavity 421 of the shell mold 4 by centrifugal force before the molten metal liquid N is solidified again. In order to avoid a situation in which a part of the molten metal N solidifies to form a crust in the crotch portion 41, the conversion ratio between the cast material (ie, the steel ingot P) and the golf club head casting can be effectively improved, thereby avoiding waste of the cast material. To reduce the cost of casting.

In addition, referring to FIG. 7, in another embodiment, the method for manufacturing the steel-based golf club head containing the active metal of the present invention can also be used in combination with the shell mold 4 having a plurality of cavity portions 421. Several golf club head castings to increase manufacturing efficiency.

In summary, the method and device for manufacturing the steel-based golf club head containing the active metal can melt the molten metal in a vacuum environment to avoid the violent oxidation reaction of the molten metal, thereby improving the casting of the golf club head. Yield; at the same time, it is also possible to use centrifugal force to melt the gold The liquid is surely poured into the cavity filled into the shell mold to avoid the condition that some molten metal solidifies in the crotch to form a crust, so that the conversion ratio between the casting material and the golf club head casting can be effectively improved, and waste casting can be avoided. Materials to reduce casting costs.

While the invention has been described in connection with the preferred embodiments described above, it is not intended to limit the scope of the invention. The technical scope of the invention is protected, and therefore the scope of the invention is defined by the scope of the appended claims.

2‧‧‧ shaft

21‧‧‧ body

22‧‧‧Turning

23‧‧‧Abutment

31‧‧‧Axis joint

311‧‧‧Perforation

32‧‧‧ Positioning Department

32a‧‧‧坩埚Location Department

32b‧‧‧Acupoint Positioning Department

321‧‧‧With holes

322‧‧‧ 容容

4‧‧‧Shell mold

41‧‧‧坩埚

411‧‧‧ accommodating space

412‧‧‧First connecting tube

42‧‧‧Move

421‧‧‧ cavity

422‧‧‧Second connection tube

5‧‧‧heater

N‧‧‧metal liquid

Claims (14)

A method for manufacturing a steel-based golf club head comprising an active metal, comprising: positioning a shell mold on a rotating platform, the shell mold comprising a connecting portion and a cavity portion, wherein the rotating platform is connected to An axially rotatable rotating shaft; a steel metal ingot containing an active metal is placed on the crotch portion of the shell mold, and the steel ingot is heated and melted into a molten metal under a vacuum environment; and the rotating shaft is driven to interlock The rotating platform rotates to cause molten molten metal to flow into the cavity portion of the shell mold; the rotating shaft is slowly stopped, and the cast-completed shell mold is removed; and the shell mold is broken to obtain a golf club head casting. The method for producing a steel-based golf club head containing an active metal according to claim 1, wherein the steel-based metal ingot is an iron base containing manganese (Mn), aluminum (Al) or bismuth (Si). The steel-based metal ingot has an iron content of more than 50%, and the steel-based metal ingot has a density of 6.5 to 7.5 g/cm ³ . The method for producing an active metal-containing steel golf club head according to claim 2, wherein the steel-based metal ingot comprises 5.0 to 35% by weight of manganese. The method for producing an active metal-containing steel golf club head according to claim 2, wherein the steel-based metal ingot comprises 6.0 to 12% by weight of aluminum. The method for producing a steel-based golf club head according to claim 2, wherein the steel-based metal ingot comprises 3.0 to 5.5% by weight of bismuth. The method for producing a steel-based golf club head containing an active metal according to claim 1, wherein the steel-based metal ingot is an iron-based group containing cobalt (Co), molybdenum (Mo) or titanium (Ti). The material, the steel ingot has an iron content of more than 50%, and the steel ingot has a tensile strength greater than 250 ksi. The method for producing a steel-based golf club head according to claim 6, wherein the steel-based metal ingot comprises 5.0% to 15.0% by weight. cobalt. The method for producing an active metal-containing steel golf club head according to claim 6, wherein the steel-based metal ingot comprises 1.0% to 6.0% by weight of molybdenum. The method for producing an active metal-containing steel golf club head according to claim 6, wherein the steel-based metal ingot comprises 0.2% to 2.0% by weight of titanium. The method for producing an active metal-containing steel golf club head according to claim 1, wherein the steel ingot comprises 15 to 30% by weight of chromium (Cr), the steel metal The density of the ingot is 7.5~8g/cm ³ . The method for producing an active metal-containing steel golf club head according to any one of claims 1 to 10, wherein the molding step of the shell mold comprises: preparing a wax embryo, the wax embryo comprising And a casting embryo, the circumferential surface of the embryo is provided with a first connecting portion, the casting embryo is provided with a second connecting portion, and the first connecting portion is oppositely connected with the second connecting portion; Forming a coating layer on the surface of the embryo; heating the wax embryo and the coating layer to melt the wax; forming the shell layer by sintering the dewaxed coating layer at a high temperature, and integrating the shell mold Connected to the crotch and cavity parts. The method for producing an active metal-containing steel golf club head according to any one of claims 1 to 10, wherein the surface layer material of the shell mold is cerium oxide, diazepam or alumina. Refractory material. The method for producing an active metal-containing steel golf club head according to any one of claims 1 to 10, wherein the back layer material of the shell mold is a mullite mixture, and the aluminum oxide The content is 45% to 60%, and the content of cerium oxide is 55% to 40%. The active metal-containing steel as described in any one of claims 1 to 10 The manufacturing method of the golf club head, wherein the back layer material of the shell mold is a cerium oxide mixture, and the content of cerium oxide is more than 95%.