| 摘要 |
PROBLEM TO BE SOLVED: To provide a die-casting product which is free from inclusion of gases such as air and steam, and usable for a functional member. SOLUTION: After a cavity 2 of a die casting die 1 is evacuated to remove the gases, oxygen is blown into the cavity 2, and the forcible feed of a molten aluminum 5 is started when the ambient pressure in the cavity 2 exceeds the atmospheric pressure. The cavity 2 is evacuated to the pressure of not more than 100 mbar through a gas suction port 11. Then, oxygen is blown from an oxygen nozzle 14, and the cavity 2 is filled with oxygen at the pressure of not less than the atmospheric pressure. When the molten aluminum 5 is forcibly fed into the evacuated cavity 2, inclusion of gases can be suppressed, and a die-casting product free from any defective casting such as porosity or blow hole can be obtained.
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