Abstract
Solidification and cooling of steel plate castings in different mould materials were investigated by the temperature measurement. Experiments were carried out on square plates of 200 mm square and 5∼25 mm in thickness. The results obtained were as follows: (1) The solidification time of the steel plate castings was proportional to the square of thicknesses, i.e. t=Kd2, the proportionality constant K being 0.23, 0.22 and 0.05 (sec/mm2) for green-sand mould, firebrick mould, and chill-sand mould (of steel shots bonded with 5% clay), respectively. (2) In green-sand mould, there was scarcely any effect of higher rate of heat extraction from the edges on the solidification of the plates during freezing except in a zone which has a width equal to the plate thickness as measured from the edges. But, after the solidification was completed, the heat extraction from the edges affected the whole parts of the plate and the cooling at the centres of the plates was also accelerated.
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