| 摘要 |
PROBLEM TO BE SOLVED: To improve the quality of an inner part by restraining the entrapment of air at injecting time. SOLUTION: Relating a die 10 for die casting which injects molten metal into a cavity 4 through plural gates 3 divided from a runner 2 succeeded to a sprue part 1 as a biscuit forming part, the runner part 2 is extended and then, this runner extended part 15 is communicated with a recessed part 4a in the cavity 4 through an auxiliary gate 16 and further, a valve 17 is disposed in the runner extended part 15. When the casting is executed, firstly, the valve 17 is made in the full opening state, and the molten metal is filled into the recessed part 4a in the cavity positioned at the lower side than the main gate 3 prior to the other portions to smoothly escape the air in the recessed part 4a. Thereafter, the valve 17 is made in the full closing state, and the final high pressure injection is executed, and the molten metal injected from the gate 3 is smoothly fluidized into every corners in the cavity 4.
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