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The Effect of Overflow on the Melt Flow in A1 Running Systems

The deleterious effect of the submerged oxide films in liquid aluminium alloys on the quality of Al castings has been shown recently. Keeping the liquid metal, which is flowing from the pouring basin to the mould cavity, free from surface turbulence is the main duty of a good running system. Naturally-pressurized running systems have been introduced recently to provide the means to achieve this goal. The effect of overflow at the end of the runner in this running system has been studied in this study. The results showed that the overflow prevents the liquid metal from a sudden stop after reaching to the end of the runner. This prevents the back-pressure to build up in the liquid metal which is flowing in the runner, and hence, prevents the turbulent entrance of the melt into the mould cavity. The experimental results are in good agreement with the simulation results obtained using SUT CAST fluid flow simulation software .