JP3361299B2 - Method for manufacturing golf club head - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a golf club head. In recent years, in order to recover miss shots during golf play and to improve the flight distance of a ball, attempts have been made to increase the moment of inertia of the head and expand the sweet spot. Of these, especially for metal wood drivers, metal materials that are lighter and stronger are required, and those made of titanium alloys are now becoming mainstream. Since the head made of titanium alloy has a specific gravity approximately 40% smaller and higher mechanical strength than the head made of stainless steel 630 in the early days of metal, the head is enlarged, that is, the moment of inertia is increased and the sweet spot is expanded. It is the best material for planning. However, in order to increase the size of the head, it is necessary to design a thinner head thickness.
There is also one aspect in which the head manufacturing technology becomes more sophisticated and the feel at impact during golf play is likely to be impaired. SUMMARY OF THE INVENTION In view of the above points, the present invention can increase the moment of inertia, expand the sweet spot, etc. without making the head manufacturing technique more sophisticated. Another object of the present invention is to provide a method for manufacturing a golf club head capable of forming a strong plating film that can withstand impacts at the time of hitting without impairing the hit feeling at the time of golf play. In order to achieve the above object, a method for manufacturing a golf club head according to the present invention includes subjecting the surface of a titanium-based metal head to blasting and alkali degreasing, followed by pyrroline. Acid copper bath or gold strike
Apply anchor plating consisting of a like bath , then again
It is characterized by performing the following plating after the alkali degreasing treatment . According to the method for manufacturing a golf club head of the present invention having the above-described configuration, since the plating layer having the above-described configuration is provided on the surface of the metal head, the characteristics of the plating material constituting the plating layer remain unchanged. For example, if a material having a specific gravity greater than that of the head material is plated on the surface of the metal head, the moment of inertia can be efficiently increased and the sweet spot can be enlarged. Further, when the surface hardness of the head is made harder by the plating material, it becomes easy to obtain the optimum spin amount necessary for improving the flight distance of the ball, and it becomes possible to improve the shot feeling. Furthermore, pyrophosphate
Since an anchor plating bath made of a copper bath or a gold strike bath is provided, it is possible to form a strong plating film that can withstand an impact at the time of hitting by an anchor action of these anchor plating baths. The metal head material is titanium,
Aluminum-based or stainless-based ones are used, but as described above, titanium-based ones are now becoming mainstream. The titanium-based material and the aluminum-based material have an advantage that the specific gravity difference from the plating material can be set large because the specific gravity is relatively small. The specific gravity of titanium material is about 4.5 and the specific gravity of aluminum material is about 2.
7. The specific gravity of chromium is about 7.2, the specific gravity of nickel is about 8.
8. When the hardness of the head surface is increased (hardened), a slip effect is generated, the ball is not subjected to unnecessary rotation, the ball is not blown up, and a trajectory with a run can be obtained. Generally, there is a method of curing the surface by shot peening the head surface or performing ion plating treatment by CVD / PVD, but this method is a surface modification at a surface layer portion of 0.1 to 1 μm. Therefore, the question remains about the sustainability of the effect. On the other hand, the plating has an advantage that the effect of the plating can be ensured over a long period of time because it is possible to process the head surface with an arbitrary film thickness. In general, the hitting sound is one of the major factors of the feeling of hitting (feeling). Especially, most amateurs tend to prefer a wood club with a strong metal tone as a nice shot. is there. Among metal heads, especially those made of titanium alloy have a better hitting sound than aluminum ones and stainless steel ones, but in order to increase the size of the head, the thickness of the head will be reduced. It has been empirically found that the hitting sound worsens. When the hitting sound is subjected to frequency analysis, a strong metal tone preferred by general amateurs has a large peak around 6000 Hz. On the other hand, according to the head having the plating layer on the surface, even if its volume is large, 6
It becomes possible to maintain a frequency around 000 Hz,
It is possible to give a player a hit feeling that is generally preferred. DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows the appearance of a golf club head according to this embodiment. This golf club head is a hollow metal head (metal wood head) 1 formed of a titanium alloy. Head 1
A plating layer 3 is provided on the entire outer surface including the face 2, and this plating layer 3 is formed of pylori as shown in FIG.
An anchor plating layer 4 made of a copper acid bath or a gold strike bath and an upper plating layer 5 made of nickel, copper, chromium or the like are used. The surface of the metal head 1 is appropriately roughened so as to further improve the adhesion or bondability with the plating layer 3, and the surface of the plating layer 3 is satin finished or sandblasted as a surface finish. . When an anchor plating layer, a nickel layer and a chromium layer are provided from the inner layer side to the titanium metal head, the metal head is plated by the following procedure. That is, first, the surface of the metal head is blasted and then the surface is alkali degreased. The reason for blasting is to roughen the surface of the head to improve the adhesion of the plating layer, and the reason for alkali degreasing is to remove dirt and the like adhering to the surface of the head. Then, pyromellitic as an anchor plating on the surface of the head
Plating copper phosphate bath or gold strike bath . This is because by plating these anchor plating
It stabilizes the plating layer. Then again
After the degreasing treatment , bright nickel is plated as an intermediate layer. This is to increase the uniform electrodeposition of the next chromium plating by plating bright nickel as the intermediate layer. Next, the outermost chromium layer is plated.
In addition, when plating copper instead of bright nickel in the above procedure, and plating copper as an intermediate layer in this way,
There is an advantage that the adhesion of the plating layer is further improved. The reason why the adhesion of the plating layer is further improved is that the copper plating is excellent in impact resistance, and thus has an effect of preventing peeling, which is high in flexibility of the copper plating,
This is because copper plating has a characteristic that it has less stress than nickel plating. In addition, when copper is plated, there is an advantage that the moment of inertia of the head is increased by the difference in specific gravity between the two (copper specific gravity: 8.93, nickel specific gravity 8.85). There is also an advantage that the feel at impact is softened by the flexibility of copper. In the case of plating a titanium-based material that is generally recognized as a difficult plating material, a plating film that can withstand an impact at the time of hitting a ball or the like cannot be obtained unless anchor plating is applied to the base. Therefore, although it is effective to perform anchor plating, it is important to consider the electrodeposition stress when selecting the type of anchor plating. That is, if the electrodeposition stress is high, the plating layer will be deformed, resulting in a lack of strong adhesion. Electrodeposition stress includes tensile stress and compressive stress. Tensile stress tends to cause peeling or cracking in the electrodeposition layer around the material and at the edge, and compressive stress tends to cause swelling and wrinkles. Therefore, it is necessary to select an anchor plating solution having the lowest electrodeposition stress, and examples of a plating bath suitable for this include a copper pyrophosphate bath or a gold strike bath . The present invention has the following effects. That is, as in the method of manufacturing a golf club head according to the present invention having the above-described structure, the surface of the titanium-based metal head is subjected to blasting and alkali degreasing, and then the copper pyrophosphate bath or gold strike.
Apply anchor plating consisting of a bath and then again
When the next plating is performed after the degreasing treatment , first, since the plating layer having the above-described configuration is provided on the surface of the metal head, the characteristics of the plating material constituting this plating layer are directly applied to the head or its surface. For example, when a material having a specific gravity larger than that of the head material is plated on the surface of the metal head, the moment of inertia can be efficiently increased and the sweet spot can be enlarged. Further, when the surface hardness of the head is made hard by the plating material, it becomes easy to obtain the optimum spin amount necessary for improving the flight distance of the ball, and the shot feeling can be improved.
In addition, since an anchor plating bath made of a copper pyrophosphate bath or a gold strike bath is provided, it is possible to form a strong plating film that can withstand an impact at the time of hitting by the anchor action of these anchor plating baths.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view of a golf club head manufactured by a manufacturing method according to an embodiment of the present invention. FIG. 2 is an enlarged cross-sectional view of a main part showing a plating structure of the head. 1 Metal head 2 Face 3 Plating layer 4 Anchor plating layer 5 Upper plating layer

─────────────────────────────────────────────────── ----- Continuation of the front page (56) References JP-A-9-268380 (JP, A) JP-A-5-228229 (JP, A) JP-A-6-205856 (JP, A) JP-A-10- 234893 (JP, A) JP 10-305117 (JP, A) JP 6-272012 (JP, A) Surface Technology Association, Surface Technology Handbook, Japan, Nikkan Kogyo Shimbun, February 1998 27th, 412-413 (58) Field surveyed (Int.Cl. ⁷ , DB name) A63B 53/04

Claims (1)

(57) [Claims] [Claim 1] A surface of a titanium metal head is subjected to blasting and alkali degreasing, and then pyrroline is applied.
A method for manufacturing a golf club head, comprising subjecting an anchor copper plating or a gold strike bath to anchor plating, and then again subjecting to alkaline degreasing treatment followed by subsequent plating.