Metal founding – Means to directly apply electrical or wave energy to work – Arc electrode
Patent
1985-06-18
1987-10-20
Godici, Nicholas P.
Metal founding
Means to directly apply electrical or wave energy to work
Arc electrode
164138, 164289, 164286, B22D 2702
Patent
active
047007699
ABSTRACT:
Improved casting of titanum or alloy of titanium is obtained by using a crucible and a mold made of high-purity magnesium oxide and/or zirconium oxide. It is also possible for only the interior portion of the crucible to be made of such high-purity material, or for the mold to be made of copper or an alloy of copper. The mold and crucible can be used in a centrifugal-type casting machine or a compression-type casting machine. In either machine, discharge vents must be provided in the mold to connect the casting chamber with the outer atmosphere. An argon electric arc generated between a pivotable, tiltable cathode and an anode may be used for melting the titanium in the crucible. A high-frequency electric current can also be used to melt the titanium. By using the above apparatus, it is possible to obtain castings which are dimensionally accurate and do not have an external layer of fragile metal oxide or rough cavities.
REFERENCES:
patent: 1015819 (1912-01-01), McManus, Jr.
patent: 3005246 (1961-10-01), Murphy et al.
patent: 3476171 (1969-11-01), Stark et al.
patent: 4254817 (1981-03-01), Kidowaki et al.
patent: 4280551 (1981-07-01), Ohara
Lang, R. M. et al., "Evaluation of Mold Materials for Ti Castings", Trans. of the Amer. Foundryman's Soc., vol. 61, May 4-8, 1953, pp. 540-545.
Nakamura Seizo
Ohara Isao
Godici Nicholas P.
Ohara Co., Ltd.
Seidel Richard K.
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