Manufacturing Technology Today

R. Rajaraman ¹, R. Velraj ²

Affiliations
1 BS Abdur Rahman Crescent Engg. College, Chennai, IN
2 College of Engg. Guindy, Anna University, Chennai, IN

Abstract

Precise estimation of interfacial heat transfer coefficient (IHTC) is necessary fo r accurate simulation o f the casting process. In this study an attempt is made for the numerical estimation of IHTC fo r a rectangular geometry, during the solidification process of aluminum alloy in a sand mould. The instantaneous cast temperature and the temperature of the mould at two locations are measured experimentally at various time intervals during solidification. Using these temperatures, the mould surface heat flux and mould surface temperature are estimated by inverse heat conduction method using control volume technique. In the control volume technique, partial differential heat conduction equation was reduced to ordinary differential equations in time, which are then solved sequentially. The IHTC values are determined from the surface heat flux and the mould surface temperature at various time intervals.

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R. Rajaraman ¹, R. Velraj ²

Affiliations
1 B S Abdur Rahman Crescent Engg. College, Anna University, Chennai, IN
2 College of Engg Guindy, Anna University, Chennai, IN

Abstract

Metal casting is one of the most important manufacturing methods. The quality of the casting is determined by the desirability of its microstructure and the absence of defects which in turn depends on the process of solidification. The solidification process is complex in nature and the simulation of the process is desirable to predict the quality of cast. Precise estimation of the interfacial heat transfer coefficient (IHTC) is essential for accurate simulation of the casting process. The present work estimates IHTC during solidification of aluminum alloy casting of cylindrical geometry with the sand mold. The mold surface heat flux and temperature are estimated by inverse heat conduction method using control volume technique. The instantaneous cast temperature is measured experimentally and this value is used in the theoretical investigations. In the present technique, partial differential heat conduction equation is reduced to ordinary differential equations in time, which are then solved sequentially. The IHTCs at various time intervals are determined from the surface heat flux and the mold surface temperature.

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