Determination of metal-mold heat transfer coefficient for aluminum alloys.

摘要

The objective of this work was to focus on the effects of various parameters on the heat transfer coefficient at the metal-mold interface. These parameters include surface roughness, metal superheat, metallostatic head, and interface gas. Experimental work was conducted in an apparatus developed to measure heat transfer at this interface. Consisting of two cylindrical sections, which form a horizontal T-shape casting. Quantitative evaluation of these parameters required the use various types of sensors, thermocouples and Linear Variable Differential Transformers. Monitoring of these sensors was carried out simultaneously to collect temperature histories and air gap development. A356 alloy and A319 alloy were studied for their industrial use. These were cast against copper, steel, and cast-iron molds. The molds were chosen to have a wide variety of heat transfer properties. An inverse heat conduction procedure was developed to estimate the interfacial heat transfer coefficient and heat flux at the metal mold interface.