Metal tools and implements – making – Blank or process – Drill
Patent
1986-05-08
1987-05-26
Parker, Roscoe V.
Metal tools and implements, making
Blank or process
Drill
164 97, B21K 502, B22C 904, B22D 1900
Patent
active
046675434
ABSTRACT:
A method of manufacturing a rock bit cone having a substantially conical body on a surface of which a number of teeth are formed is manufactured by pressure-casting with using a casting mold having a molding surface including a cone body defining surface portion and tooth defining surface portions, pouring a molten metal of very hard and low melting point alloy having a melting point of 1040.degree.-1120.degree. C. and Rockwell hardness of 55-65 to the casting mold to centrifugal-cast at least a predetermined area including a tip of each tooth with the hard metal, and pouring a molten tough metal to the casting mold to centrifugal-cast the cone body.
REFERENCES:
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patent: 2125332 (1938-08-01), Bursell
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patent: 2260593 (1941-10-01), Wittlinger
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patent: 4276788 (1981-07-01), Van Nederveen
patent: 4396077 (1983-08-01), Radtke
patent: 4423646 (1984-01-01), Bernhardt
Atsuta Toshio
Miyasaka Tomoo
Nishiyama Yukio
Tsugaki Shoichiro
Kawasaki Jukogyo Kabushiki Kaisha
Parker Roscoe V.
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