REDUCED-PRESSURE CASTING DEVICE

摘要

<P>PROBLEM TO BE SOLVED: To correctly detect the occurrence of abnormality regarding a vacuum and a pressure-reduced state in a reduced-pressure casting device. Ž<P>SOLUTION: The reduced-pressure casting device 10 comprises: a cavity 14 to which molten metal is injected; a vacuum tank 42 connected from the cavity 14 via a connection pipeline 18; a vacuum pump 44 reducing the pressure in the vacuum tank 42; a solenoid valve 40 provided at the connection pipeline 18; a first negative pressure sensor 36 measuring the first pressure P1 on the upstream side than the solenoid valve 40 in the connection pipeline 18; and a second negative pressure sensor 46 measuring the second pressure P2 on the downstream side than the solenoid valve 40 or in the vacuum tank 42. A control part 20 compositely monitors the first pressure and the second pressure, and specifies the part from which abnormality is occurred and the kind of the abnormality. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž