| 摘要 |
PURPOSE:To improve vacuum effect in a cavity by forming gas vent passage in a pouring basin part around the cavity, arranging a vacuum valve and chill vent in the gas vent passage and connecting with vacuum device. CONSTITUTION:The gas vent passage 3 extending from the pouring basin part 2 formed along the periphery of the cavity 1 is formed. The vacuum valve 4 is arranged as including on the way of the gas vent passage 3, and the chill vent 5 is formed at end part of the passage 3. From the time of closing pouring hole in an injection sleeve by executing low speed injection in a plunger tip, the vacuum device 6 is worked and the gas in the cavity 1 is forcedly sucked from the valve 4 and chill vent 5, to exhaust the gas to out of the cavity. Successively, the suction is continued till the injection to fill up the molten metal is completed and the molten metal is solidified. By this method, as the vacuum degree in the cavity 1 is surely held, the vacuum effect is improved.
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