Metal founding – Process – Shaping liquid metal against a forming surface
Patent
1991-05-09
1992-12-08
Lin, Kuang Y.
Metal founding
Process
Shaping liquid metal against a forming surface
164514, B22D 2702
Patent
active
051689170
ABSTRACT:
A method for casting dental metals with a casting apparatus including a melting chamber in which there are located an arc electrode above and a crucible formed of an electrically conductive material positioned below the arc electrode, and a mold chamber divided from the melting chamber by a partition wall having a through-hole at a position below the crucible and housing a mold box receiving a mold provided with an extending open vent positioned below the through-hole, the melting chamber communicating hermetically with the mold chamber through the mold, which is characterized by positioning a dental metal ingot on the crucible, vacuumizing the melting and mold chambers, feeding a small amount of an inert gas into the melting chamber at such a pressure as to induce arc discharge all over the upper surface of the ingot, thereby melting the ingot placed on the crucible by arc discharge from the arc electrode, pouring the thus obtained molten metal into the mold through its inlet, and immediately feeding an additional amount of the inert gas into the melting chamber to increase its internal pressure to a level suitable for casting.
REFERENCES:
patent: 3977462 (1976-08-01), Ohara
patent: 4254817 (1981-03-01), Kidowaki et al.
Hayashi Shohei
Iiyama Kenichi
Ito Yasutaro
Kojima Norio
Okuda Reiichi
GC Corporation
Lin Kuang Y.
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