Abstract
This paper deals with the shrinkage of the casting in the molds with core. We analysed the casting process by time range to know the temperature of casting when it was ejected out from the core, because the shrinkage of casting is quite up to the temperature of casting.The temperatures were as follows:(1) Shringage varied according to the die temperature.(2) It varied according to the time interval in which the casting was laid in the die.(3) It varied according to the thickness of the wall of casting.(4) It varied according to the temperature of die cavity surface.From the above result, we could determine the shrinkage coefficent of the die to be designed. In the previous report the calculated shrinkage coefficent differed by 0-1.6×10-3 from the measured value.So that we must correct the previous formula and set up a new shrinkage formula as follows: ΔL=α(ts-20)-αf(tf-20)+σt/Et α: Expansion coefficent of casting. ts: Temperature of casting when it was ejected out. αf; tf: Expansion coefficent and temperature of die. σt, Et: Elastic limit and Young's modulus of casting at ts.From the present experiments we realized that this formula was more exact than the previous one.
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