Title:
【発明の名称】歯科用金属の鋳造法
Document Type and Number:
Japanese Patent JP2912940
Kind Code:
B2
Abstract:
A method for casting dental metals with a casting apparatus including a hermetically sealed casting chamber in which an arc electrode is located above, a crucible made of an electrically conductive material is positioned below the arc electrode, and a mold provided with a closed vent is disposed below the crucible, the method including by positioning a dental metal ingot on the crucible, evacuating the casting chamber to vacuum, feeding a small amount of an inert gas 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 a mold through its inlet, and immediately feeding an additional amount of the inert gas into the casting chamber to increase its internal pressure to a level suitable for casting. Also the additional amount of the inert gas is rapidly fed into the casting chamber through a gas tank in the vicinity of the casting chamber.
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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:
JP12696390A
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:
| JP62270268A | ||||
| JP62193956U | ||||
| JP605971Y2 |
Attorney, Agent or Firm:
Tadayuki Noma