Method of coating golf club head under vacuum condition with open hanger type shot blasting machine

摘要

A method of coating a golf club head under vacuum conditions with an open hanger type shot blasting machine includes the steps of forming a blank of golf club head; grinding the blank to form large pores on the surface of the blank; polishing the blank to form a refined blank containing fine pores on the surface thereof; hanging multiple refined blanks on hangers in an opening hanger type shot blasting machine to rotate and move the blanks into a vacuum rear portion of the machine. Meanwhile, shot blasting material containing mixed shot grit and powdered metal coating material is centrifugally thrown with mechanical throwing arms, so that shot grit strikes and forms numerous deeply depressed pores on the refined blanks. The shot grit quickly leaves the surfaces of the refined blanks due to a reactive force produced during impact of the shot grit on the blanks. The powdered metal coating material, due to a small reactive force at impact on the blanks and a diameter smaller than that of the depressed pores formed by the shot grit on the blanks, tends to deposit in the depressed pores and firmly adhere thereto. With a final hard anodizing treatment, the blanks become finished golf club heads having a hard protective metal coating.