Abstract:
A surface treating method for a golf club head made of carbon steel basically has one nitriding step and two oxidizing steps. The method further has polishing, sandblasting and rinsing steps and so on processed prior to or between the basic steps, and then has polishing and oil immersing steps and so on processed after the basic steps. The finished golf club head has uniform dark appearance and also has good corrosion resistance and abrasion resistance. Furthermore, the surface of the finished golf club head does not peel off. Moreover, the method also has advantages including low pollution and low cost.

Description:
BACKGROUND OF THE INVENTION 
       [0001]    1. Field of the Invention 
         [0002]    The present invention relates to a manufacturing method for a golf club head, particularly to a surface treating method for a golf club head that has been formed by a forming progress. 
         [0003]    2. Description of the Prior Arts 
         [0004]    A conventional golf club head made of carbon steel easily rusts so that the conventional golf club head made of carbon steel is subjected to surface treatment by electroplating, ion plating and so on to improve the appearance of the conventional golf club head. 
         [0005]    With regards to electroplating technology, the conventional golf club head is electroplated with a nickel layer or a chromium layer in bright silver. The thickness of the nickel layer is about 20 to 25 μm and the thickness of the chromium layer is about 3 to 8 μm. However, because the electroplating surface treating method is processed with heavy metal chemical agents, the environment is polluted and human health is harmed. Further, the electroplating layer is not secured tightly on the golf club head. When the conventional golf club head is used after a period of time, the electroplating layer easily peels off. Moreover, with the nickel layer or the chromium layer, the appearance of the golf club head can only be made in bright silver, but cannot be made in black, dark brown or other dark colors. 
         [0006]    As for ion plating technology, the golf club head can be made in iron gray, black or other dark colors. However, using ion plating method to treat the surface of the golf club head costs high. Further, thickness of the black layer made by the ion plating is only about 1 to 5 μm such that the layer made by the ion plating has poor corrosion resistance and abrasion resistance. 
         [0007]    To overcome the shortcomings, the present invention provides a surface treating method for a golf club head to mitigate or obviate the aforementioned problems. 
       SUMMARY OF THE INVENTION 
       [0008]    The main objective of the present invention is to provide a surface treating method that conditions the golf club head to have good corrosion resistance and abrasion resistance and also to have a good appearance. The surface treating method for a golf club head made of carbon steel basically has one nitriding step and two oxidizing steps. The method further has polishing, sandblasting, and rinsing steps and so on processed prior to or between the basic steps, and then has polishing and oil immersing steps and so on processed after the basic steps. The finished golf club head has uniform dark appearance and also has good corrosion resistance and abrasion resistance. Furthermore, the surface of the finished golf club head does not peel off. Moreover, the method also has advantages including low pollution and low cost. 
         [0009]    Other objectives, advantages and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0010]      FIG. 1  is a flow chart of a surface treating method for a golf club head in accordance with the present invention. 
       
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
       [0011]    With reference to  FIG. 1 , a surface treating method for a golf club head in accordance with the present invention comprises the following acts. 
         [0012]    A golf club head is provided. The golf club head is made of carbon steel such as low carbon steel, medium carbon steel and high carbon steel, or is made of alloy steel consisting of carbon steel and other materials that are added with certain purposes by casting, forging or other means. The golf club head may be wood golf club head or iron golf club head. 
         [0013]    The golf club head is ground by grinding machine performing grinding means on the golf club head to condition the shape of the golf club head. 
         [0014]    The surface of the ground golf club head is rinsed to remove the residues on the surface of the golf club head. In a preferred embodiment, the golf club head is rinsed by ultrasonic means. 
         [0015]    The surface of the rinsed golf club head is checked to inspect whether the shape of the golf club head is qualified, or whether holes are formed on the surface of the golf club head. The golf club heads having non-qualified shapes or holes are eliminated and the golf club heads that are qualified are preserved. 
         [0016]    The qualified golf club head is sandblasted to form a predetermined abrasive surface on the golf club head. 
         [0017]    The sandblasted golf club head is rinsed to remove the residues on the surface of the golf club head. In a preferred embodiment, the golf club head is rinsed by chemical agents such as acetone. 
         [0018]    Then the golf club head is mounted on a jig and is transported. The jig is chosen based on the size of the golf club head and protects the golf club head to keep the golf club head from pressing and pumping in the following steps. 
         [0019]    The golf club head on the jig is pre-heated by passing through an environment at 350° C. to 400° C. so that the water on the surface of the golf club head is removed to keep the surface of the golf club head dry and the golf club head is also pre-heated to a predetermined temperature. 
         [0020]    The pre-heated golf club head is nitrided. The pre-heated golf club head is put into a sealed nitriding reactor at 350° C. to 400° C. for one to three hours. With the active nitrogen generated by the nitriding reactor permeating into the golf club head, the surface of the golf club head has a nitride layer having good corrosion resistance and abrasion resistance. 
         [0021]    The nitrided golf club head is processed with first oxidizing. In a preferred embodiment, the golf club head is put into an aerobic environment at 380° C. to 450° C. for thirty to sixty minutes to form an oxide layer on the surface of the golf club head. Therefore, the oxide layer is formed outside the nitride layer to protect the nitride layer properly. 
         [0022]    Then the golf club head is cooled and rinsed. The surface of the golf club head is rinsed and cooled down. 
         [0023]    The golf club head is sandblasted or polished. The golf club head is taken off from the jig and the surface of the golf club head is sandblasted or polished to remove the loosening layer on the nitride layer and to remove a part of the oxide layer. 
         [0024]    The golf club head is mounted on the jig again and transported. The jig protects the golf club head to keep the golf club head from pressing and pumping in the following steps. 
         [0025]    The golf club head on the jig is pre-heated by passing through an environment at 350° C. to 400° C. so that the golf club head is pre-heated to a predetermined temperature. 
         [0026]    The nitrided golf club head is processed with second oxidizing. In a preferred embodiment, the golf club head is put into an aerobic environment at 380° C. to 450° C. for thirty to sixty minutes to form a dark oxide layer on the surface of the golf club head in dark colors such as black, dark blue or dark brown. Further, by the second oxidization, the dark oxide layer on the surface of the golf club head also displays a uniform color. 
         [0027]    Then the golf club head is cooled and rinsed. The surface of the golf club head is rinsed and cooled down. 
         [0028]    The golf club head is baked to dry the surface of the golf club head. In a preferred embodiment, the golf club head is put in the oven at 60° C. for about thirty minutes. 
         [0029]    The golf club head is polished to display a uniform dark appearance on the golf club head such as black, dark blue, dark brown and so on. 
         [0030]    The golf club head is oil immersed. The golf club head is put into the oven at 60° C. for pre-heating. When the golf club head is taken out from the oven, the golf club head is immediately immersed in the antirust oil at 60° C. and then taken out of the antirust oil and stands at room temperature for fifteen to thirty minutes. Then the golf club head is swabbed to be dried by dry cloth. 
         [0031]    The appearance of the oil immersed golf club head is checked to finish the surface treatment. 
         [0032]    With the aforementioned steps, the surface treating method as described has the following advantages: 
         [0033]    1. Low contamination, low environmental pollution and conforming to environmental protection: The surface treating method as described uses the nitriding means and oxidizing means for two times to treat the surface of the golf club head so that the chemical agents are reduced to lower the pollution and to conform to the environmental protection. 
         [0034]    2. Good corrosion resistance and abrasion resistance: The surface treating method as described uses the nitriding means and oxidizing means for two times to provide the layer on the surface of the golf club head with good corrosion resistance and abrasion resistance, and also to provide good antirust function for the surface of the golf club head made of carbon steel. 
         [0035]    3. No layer peeling off: Because the surface treating method as described uses the nitriding means and oxidizing means for two times, the nitrogen permeates into the surface of the golf club head to form nitride layer and oxide layer. The nitride layer and oxide layer are formed by chemical reaction so that are bound securely to the surface and do not peel off from the surface of the golf club head. 
         [0036]    4. No weight and size change: Because the surface treating method as described uses the nitriding means and oxidizing means for two times, the nitrogen permeates into the surface of the golf club head to form nitride layer and oxide layer. The golf club head does not have any extra layer so that the weight and the size of the golf club head are not changed. 
         [0037]    5. Good appearance: The golf club head treated by the method as described has a beautiful appearance in uniform pure black, dark blue, or dark brown. 
         [0038]    Even though numerous characteristics and advantages of the present invention have been set forth in the foregoing description, together with details of the structure and features of the invention, the disclosure is illustrative only. Changes may be made in the details, especially in matters of shape, size, and arrangement of parts within the principles of the invention to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.