Method and apparatus for controlling current level in arc discharge melting of material to be precision cast
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United States of America Patent
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Aug 14, 1984
Grant Date -
N/A
app pub date -
Sep 1, 1981
filing date -
May 21, 1981
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method for casting material melted by arc discharge and an arc melting apparatus useful with a precision casting machine, the invention is practiced by initiation of an arc discharge at an arc current lower than the steady state current normally used for arc melting, thereby to prevent starting shock. Current level is subsequently increased in a rapid and regular manner to a steady state current for melting in a stable manner the material which is to be cast. The apparatus of the invention includes a small and compact arc power source provided with apparatus for controlling the arc current which is applied to the material to be melted. When utilized with a precision casting apparatus, the invention improves the manufacture of artificial teeth, accessories, industrial mechanical parts and the like.
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