| 摘要 |
PROBLEM TO BE SOLVED: To provide a die casting apparatus with which in the case of injecting and filling up molten metal by reducing the pressure in a cavity, the time needed to the reducing of the pressure can be shortened and the reduction of the pressure can be attained to further lower pressure. SOLUTION: In the die casting apparatus, in which the air in the cavity formed in a die, is exhausted and reduced in pressure, and the molten metal is injected and filled up into the cavity reduced in pressure to shape a casting, this apparatus is provided with a plurality of vacuum tanks TA, TB connected with a closed space to be reduced in pressure beforehand, including the cavity C and a plurality of opening/closing valves 70A, 70B for opening/closing respective intervals between the vacuum tanks TA, TB and the closed space including the cavity C. The inner part of the closed space including the cavity C is reduced in pressure to a desired pressure by changing over the vacuum tank used for reducing the pressure in the closed space including the cavity C with the open/close of the opening/closing valves 70A, 70B. COPYRIGHT: (C)2005,JPO&NCIPI
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