Effect of Pouring Temperature on the Solidification Time of Casting

NIYAMA Eisuke

doi:10.11279/imono.47.11_778

Effect of pouring temperature on the solidification time of sand castings was studied theoretically. The former theory by R. W. Ruddle predicted that the dependence of solidification time on pouring temperature was related solely to the properties of the cast metal. By pointing out the negligence in that theory of sensible heat to be extracted from the casting before completion of solidification, a correction factor β was introduced in the present study. <br> By numerical calculation, as well as by examination of the experimental data in past publications, it was found that β was nearly always less than unity, meaning that the ffect of pouring temperature was less pronounced than predicted by the former theory. The factor β was particularly small when the heat diffusivity of the cast metal was low, or when the heat diffusivity of the mold was high, or when the shape of the casting was chunky rather than flat. As an exceptional case, the effect of pouring temperature was more pronounced than predicted by the former theory when a core was used in the mold. With a casting of the shape of a hollow cylinder the most marked effect of the core was observed at the internal radius to external radius ratio of 0.35. <br> Based on these results, effect of pouring temperature on the directional solidification of casting was discussed qualitatively.

Effect of Pouring Temperature on the Solidification Time of Casting

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