EVALUATION OF TRANSIENT HEAT TRANSFER COEFFICIENT EVOLUTION IN EN 43000 GRAVITYrnCASTINGS TOWARDS CHILLS WITH DIFFERENT INTERFACE CONDITIONS

摘要

Heat exchange phenomena in foundry processes are governed byrnthe heat resistance through contact interfaces between metal andrncasting tools. As known, physical and geometrical aspects play arnfundamental role on the heat transfer conditions during thernsolidification process.rnThis high dependence of heat transfer coefficient (HTC) byrnprocess variables determines the experimental method as the onlyrnway for a correct evaluation of heat fluxes during the coolingrnphase. The evolution of HTC between EN43000 aluminum alloyrnand two different metallic chills was here investigated by meansrnof an experimental gravity casting device and by developing anrninvestigation approach based on inverse method and numericalrnanalysis. The accuracy of achieved results was evaluated byrncomparison between measured and predicted values ofrntemperature in the cast and through some considerations on thernefficiency of the adopted method and his application capabilitiesrnto the numerical simulation of industrial casting processes.