The flowout behavior of molten metal (ADC12) through many gates of a die casting runner has been examined. The flowout behavior of water through the gates was similar to that of molten metal. Flowout volume through the lower runner gates was greater than the volume through the upper runner ones, and bubbles appeared in the runner when the unpressurised system (main runner/sub runner=1:1.6) was used. Flowout volumes through the gates were equal to one another when the pressurised system (main

more »

... ner/sub runner=1:0.8) was used and the ratio (gates area/runner area) was reduced to 0.3. Filling-up time was shortened by using the pressurised system and reducing the ratio (gate area/runner area) to 0.5. The bubbles, which appeared in the runner with the unpressurised system, were not observed in the one with a pressurised system.