(부산대학교 금속공학과)
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(울산대학교 첨단소재공학부)
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((주)애니캐스팅 기술연구소)
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(한국생산기술연구원 부산연구센터)
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(부산대학교 금속공학과)
(Dept. of Metallurgical Engineering, Pusan National University)
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(School of Materials Science & Engineering, University of Ulsan)
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(R&D Center, Anycasting Co. LTD)
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(Pusan R&D Center, Korea Institute of Industrial Technology)
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(Dept. of Metallurgical Engineering, Pusan National University)
Molten metal flow in vacuum die casting was characterized by a numerical analysis. The VOF method was used to simulate the filling behaviors of molten metal during filling process. The various vacuum degrees of no vacuum(760 mmHg), 650, 500, 250 and 60mmHg were artificially applied in cavity. And the filling behaviors of molten metal with the applied vacuum conditions were simulated and compared with those of experiment. The results showed that molten metal was partially filled into cavity when vacuum was applied and the filling length of molten metal in cavity was increased with increasing applied reduced pressure in cavity. Also, the simulated filling behaviors of molten metal were apparently similar to those of experiment, indicating the numerical analysis developed in this study was highly effective. Through the result of fluid flow simulation, both relation equations of filling length and filling velocity with the variation of pressure conditions in cavity were calculated respectively and the internal gas contents of casting was significantly reduced by the modification of vacuum gate system.