Manufacturing method for golf club head components

Abstract

This solves the problem of pores forming in golf club head parts molded using conventional 3D printing. [Solution] The method involves providing a powder material containing 7.3-8.35% aluminum, 0.75-1.25% vanadium, 0.1-0.4% iron, 0.75-1.25% molybdenum, the remainder being titanium and unavoidable impurities by weight percentage, and 3D printing the powder material at a laser output of 120-180W and a laser scanning speed of 700-1300mm / s to form a semi-finished golf club head part. This has the effect of improving the quality of the semi-finished golf club head part.

Description

Technical Field

[0001] The present invention relates to a method for manufacturing golf club head parts, and more particularly to a method for manufacturing golf club head parts formed by 3D printing.

Background Art

[0002] Generally, when manufacturing golf club head parts (such as face plates and head bodies), they are manufactured by injecting a molten metal into a mold, cooling it, and then shaping it into a predetermined part, or by forging a metal block and shaping it into a predetermined part. However, golf club head parts obtained by casting or forging have only a monotonous shape and are difficult to meet various customization requirements. Therefore, when forming golf club head parts, a golf club head part with a predetermined shape may be formed by 3D printing. However, there is a problem that pores are likely to occur on the surface of golf club head parts formed by 3D printing, leading to deterioration of the mechanical properties of the parts. In view of the above, there is still room for improvement in the conventional method for manufacturing golf club head parts.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In order to solve the above problems, an object of the present invention is to provide a method for manufacturing golf club head parts that can reduce the generation of pores on the surface of golf club head parts.

Means for Solving the Problems

[0005] The terms describing directions or their approximate equivalents throughout the specification of this invention, such as "front," "back," "left," "right," "top (summit)," "bottom (bottom)," "inside," "outside," and "side," are based on the directions shown in the accompanying drawings. Each of these directions or similar terms is merely for the purpose of assisting in the explanation and understanding of each embodiment of the invention and does not limit the invention.

[0006] Throughout the specification of this invention, the counter words "one" or "one" used with respect to parts or components are used for convenience and to give a common meaning to the scope included in this invention, and should be interpreted as one or at least one in this invention, and unless explicitly stated otherwise, the concept of one also includes cases of multiple.

[0007] In the entirety of the specification of this invention, approximate terms such as "joining," "combining," or "assembling" mainly include those that can be separated without damaging the members even after joining, and those that cannot be separated after joining, and these can be selected by a person with ordinary skill in the art according to the material of the members to be joined or the requirements of the assembly.

[0008] The present invention provides a method for manufacturing a golf club head component, comprising providing a powder material containing 7.3 to 8.35% aluminum, 0.75 to 1.25% vanadium, 0.1 to 0.4% iron, 0.75 to 1.25% molybdenum, the remainder being titanium and unavoidable impurities by weight percentage, and 3D printing the powder material at a laser output of 120 to 180 W and a laser scanning speed of 700 to 1300 mm / s to form a semi-finished golf club head component.

[0009] As a result, the method for manufacturing a golf club head component of the present invention reduces pores on the surface of the semi-finished golf club head component by 3D printing and molding it with a predetermined laser output and laser scanning speed, thereby preventing a decrease in the mechanical properties of the semi-finished golf club head component due to these pores and improving the quality of the semi-finished golf club head component.

[0010] Furthermore, the powder material is characterized by having a particle size of 15 to 53 μm. This makes it possible to apply this technology to the molding of semi-finished golf club head parts using 3D printing.

[0011] Furthermore, the method is characterized by 3D printing the powder material with a laser output of 170W and a laser scanning speed of 1250mm / s to form the semi-finished golf club head component. This makes it possible to reduce the occurrence of pores on the surface of the semi-finished golf club head component.

[0012] The process further includes a step of annealing the semi-finished golf club head component, characterized in that the semi-finished golf club head component is heated to 550-850°C and held for 90-360 minutes. This allows the semi-finished golf club head component to have better mechanical properties.

[0013] Furthermore, the annealing treatment is characterized by heating the semi-finished golf club head component to 600-800°C and holding it for 90-360 minutes. This allows the semi-finished golf club head component to have better mechanical properties.

[0014] Furthermore, the semi-finished golf club head component after annealing is characterized by having a yield strength of 160-185 ksi, a tensile strength of 160-195 ksi, an elongation of 5-15%, and a hardness of 40-43 HRC. As a result, the semi-finished product of the golf club head component can have better strength.

[0015] Also, the density per 10 mm of the semi-finished product of the golf club head component is characterized by exceeding 99.6%. As a result, it is possible to prevent the mechanical properties of the semi-finished product of the golf club head component from deteriorating due to pores on the surface of the semi-finished product of the golf club head component.

Best Mode for Carrying Out the Invention

[0016] In order to more easily understand the above objects, other objects, features and advantages of the present invention, embodiments of the present invention will be described in detail below by way of examples.

[0017] A preferred embodiment of the method for manufacturing a golf club head component of the present invention includes forming a semi-finished product of a golf club head component by 3D printing using a powder material.

[0018] The powder material may be an alloy powder, and its particle size may be 15 to 53 μm. The powder material can be used for forming a golf club head component having good mechanical properties according to a specific composition ratio of a plurality of metal elements and non-metal elements. In this embodiment, the powder material can include 7.3 to 8.35% aluminum (Al), 0.75 to 1.25% vanadium (V), 0.1 to 0.4% iron (Fe), 0.75 to 1.25% molybdenum (Mo), the balance being titanium (Ti) and unavoidable impurities by weight percentage. As a result, the powder material can be formed into a semi-finished product of a golf club head component having excellent mechanical properties.

[0019] The powder material can be formed into the semi-finished product of the golf club head component by 3D printing using laser sintering. ​For example, it can be formed into the semi-finished product of the golf club head component by 3D printing technology such as selective laser melting (SLM). In this embodiment, for example, after laying the powder material on the base to a predetermined thickness, laser sintering can be performed on the powder material to form the cross-section of the semi-finished product of the golf club head component. The semi-finished product of the golf club head component may be, for example, a head body, a face plate, a lid, or the like. Subsequently, after laminating the powder material to a predetermined thickness on the cross-section of the semi-finished product of the golf club head component, laser sintering is further performed on the powder material, and by repeating such lamination, the semi-finished product of the golf club head component is formed. More specifically, the powder material is irradiated with a laser output of 120 - 180 W and a laser scanning speed of 700 - 1300 mm / s. In this way, by an appropriate laser output and laser scanning speed, the pores on the surface of the semi-finished product of the golf club head component are reduced, and the densification per 10 mm of the semi-finished product of the golf club head component can exceed 99.6%, and the surface of the semi-finished product of the golf club head component can have excellent densification. 2 Furthermore, the manufacturing method of the golf club head component of the present invention can include further performing heat treatment on the semi-finished product of the golf club head component, whereby the semi-finished product of the golf club head component can have excellent mechanical properties.

[0020] It should be noted that heat treatment corresponding to the semi-finished product of the golf club head component formed by different powder materials can be performed. In this embodiment, annealing treatment is performed on the semi-finished product of the golf club head component. ​More specifically, the annealing treatment may include heating the semi-finished golf club head component to a predetermined temperature higher than the recrystallization temperature of the semi-finished golf club head component, holding it at the predetermined temperature for a certain period of time, and then slowly cooling it. This improves the ductility and toughness of the semi-finished golf club head component and also removes internal residual stress. More specifically, the annealing treatment may include heating the semi-finished golf club head component to 550-850°C, holding it for 90-360 minutes, and then slowly cooling it, preferably including heating it to 600-800°C and holding it for 90-360 minutes. As a result, the semi-finished golf club head component can have a yield strength of 160-185 ksi, a tensile strength of 160-195 ksi, an elongation of 5-15%, and a hardness of 40-43 HRC.

[0021] Next, the number of pores on the surface of the semi-finished golf club head parts molded under the 3D printing conditions shown in Table 1 was measured. The results are shown in Table 2.

[0022] [Table 1]

[0023] [Table 2]

[0024] As can be seen from Table 2, the method for manufacturing a golf club head component of the present invention involves irradiating the powder material with a laser scanning speed of 650 mm / s to form the semi-finished golf club head component, after which a large number of pores are formed on the surface of the semi-finished golf club head component (sets 1, 5, and 10). On the other hand, increasing the laser scanning speed significantly suppressed pore formation. Therefore, we measured the effect of different laser power levels on density at a laser scanning speed of 1250 mm / s (sets 8, 9, and 13). Each group's measurement was repeated four times, and the results are shown in Table 3.

[0025] [Table 3]

[0026] As can be seen from Table 3, when the manufacturing method of the golf club head component of the present invention is used to form a semi-finished golf club head component with a laser output of 170W at a laser scanning speed of 1250 mm / s, the semi-finished golf club head component can have the highest density (set 9). Next, the mechanical properties of the 9th set of annealed golf club head parts were measured, and each annealing condition was repeated several times. The results are shown in Table 4. As can be seen from Table 4, compared to the case where annealing treatment is not performed, the mechanical properties of the semi-finished golf club head parts are significantly improved after annealing treatment, and the strength of the semi-finished golf club head parts can be further improved.

[0027] [Table 4]

[0028] As described above, the method for manufacturing a golf club head component of the present invention reduces pores on the surface of the semi-finished golf club head component by 3D printing and molding it with a predetermined laser output and laser scanning speed, thereby preventing a decrease in the mechanical properties of the semi-finished golf club head component due to these pores and improving the quality of the semi-finished golf club head component.

[0029] Although the present invention has been disclosed with respect to the above embodiments, these embodiments are not intended to limit the present invention. Those skilled in the art will know that various modifications to the above embodiments will remain within the scope of the invention, as long as they do not deviate from the spirit and scope of the invention. Accordingly, the scope of protection of the present invention includes all modifications within the scope of the language set forth in the claims described below and equivalents.

Claims

1. We provide a powder material containing 7.3–8.35% aluminum, 0.75–1.25% vanadium, 0.1–0.4% iron, 0.75–1.25% molybdenum, the remainder being titanium and unavoidable impurities, by weight percentage. A method for manufacturing a golf club head part, comprising 3D printing the aforementioned powder material with a laser output of 120 to 180 W and a laser scanning speed of 700 to 1300 mm / s to form a semi-finished golf club head part.

2. The method for manufacturing a golf club head component according to claim 1, characterized in that the powder material has a particle size of 15 to 53 μm.

3. A method for manufacturing a golf club head part according to claim 1, characterized in that the powder material is 3D printed with a laser output of 170 W and a laser scanning speed of 1250 mm / s to form the semi-finished golf club head part.

4. The process further includes applying an annealing treatment to the aforementioned semi-finished golf club head component, The method for manufacturing a golf club head part according to claim 1, characterized in that the annealing treatment involves heating the semi-finished golf club head part to 550 to 850°C and holding it for 90 to 360 minutes.

5. The method for manufacturing a golf club head part according to claim 4, characterized in that the annealing treatment involves heating the semi-finished golf club head part to 600 to 800°C and holding it for 90 to 360 minutes.

6. The method for manufacturing a golf club head part according to claim 4, characterized in that the semi-finished golf club head part after annealing treatment has a yield strength of 160 to 185 ksi, a tensile strength of 160 to 195 ksi, an elongation of 5 to 15%, and a hardness of 40 to 43 HRC.

7. 10 mm of the aforementioned golf club head semi-finished product ２ A method for manufacturing a golf club head component according to claim 1, characterized in that the density per unit area exceeds 99.6%.

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