Title:
【発明の名称】歯科用金属の鋳造方法
Document Type and Number:
Japanese Patent JP2912941
Kind Code:
B2
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.
Inventors:
OKUDA REIICHI
KOJIMA NORIO
IIYAMA KENICHI
YAMAMURA YOSHINOBU
ITO YASUTARO
HAYASHI SHOHEI
KOJIMA NORIO
IIYAMA KENICHI
YAMAMURA YOSHINOBU
ITO YASUTARO
HAYASHI SHOHEI
Application Number:
JP12696490A
Publication Date:
June 28, 1999
Filing Date:
May 18, 1990
Export Citation:
Assignee:
JII SHII KK
International Classes:
B22D18/04; B22D18/06; A61C13/20; B22D21/00; B22D21/02; B22D23/00; (IPC1-7): B22D23/00; A61C13/20
Domestic Patent References:
| JP178659A | ||||
| JP62270268A | ||||
| JP62193956U | ||||
| JP605971Y2 |
Attorney, Agent or Firm:
Tadayuki Noma