| 摘要 |
PROBLEM TO BE SOLVED: To provide a precision casting process for inexpensively producing a material as cast having satisfactory surface properties, and to provide a precision-cast product. SOLUTION: The precision casting process is provided for producing the precision-cast product 10 by pouring molten metal nto a cavity of a shell mold and performing casting. The precision casting process is characterized in that when the pouring is performed using the molten metal having high reactivity with the shell mold, the shell mold is arranged in a pressure vessel, thereafter, the inside of the pressure vessel is evacuated, subsequently, inert gas or gaseous nitrogen is introduced into the pressure vessel to control the pressure in the atmosphere to 1 Pa to the atmospheric pressure (about 0.1 MPa), and while the atmospheric pressure is held at the state, the molten metal is poured into the cavity. COPYRIGHT: (C)2007,JPO&INPIT
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