Metal treatment – Process of modifying or maintaining internal physical... – Heating or cooling of solid metal
Patent
1993-03-09
1995-01-03
Passaniti, Sebastiano
Metal treatment
Process of modifying or maintaining internal physical...
Heating or cooling of solid metal
273167R, 273167H, C21D 900, A63B 5304
Patent
active
053782950
ABSTRACT:
In production of a shell-type golf club head made up of several different pieces, an iron-type material of a specified chemical composition and carbon equivalent is subjected to a combination of annealing before shaping with quenching after shaping. Exclusion of the conventional casting process in production much improves mechanical characteristics of the product and increase mechanical strength enables formation of a large size golf club head with an enlarged sweet spot. Limited and locally specified disposition of weld lines assures highly accurate lie and loft angles with reduced welding strain.
REFERENCES:
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patent: 4314863 (1982-02-01), McCormick
patent: 4576655 (1986-03-01), Josefsson
patent: 5089067 (1992-02-01), Shumacher
patent: 5104457 (1992-04-01), Viljoen
patent: 5154781 (1992-10-01), Catellier
patent: 5167733 (1992-12-01), Hsieh
Horio Yuma
Hoshi Toshiharu
Iijima Takashi
Nishida Kikuo
Tsuchiya Kazuhiro
Passaniti Sebastiano
Yamaha Corporation
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