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pISSN : 1598-706X / eISSN : 2288-8381


(논문)연구논문

한국주조공학회지 (27권4호 153-158)

A study on Characteristics of Molten Metal Flow in Vacuum DieCasting by Numerical Analysis

수치해석에 의한 진공다이캐스팅에서의 용탕 유동특성 연구

Jin Young Park, Kwan Woo L im *, Kwang Hak Lee*, Sung Bin K im **, Eok Soo Kim***, Ik Min Park

Pusan National University, *University o f Ulsan, **R&D Center, Anycasting Co., ***Pusan R&D Center, Korea Institute o f Industrial Technology

Abstract

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.

Keywords

Vacuum die casting, Vacuum degree, Vacuum reduced pressure, Gas contents, Vacuum gate system, Fluid flow simulation, Numerical analysis