Abstract
We intended to get hot iron to make good iron castings, and succeeded in melting iron in the reasonable high temperature by the cupola, then solved some problems on defects which appeared in castings. The effect of the melting temperature on some properties of castings had been made clear by our study in these several years. I am desiring to report on these points in this paper. (1) Pressure tightness of castings ; pressure tightness in cast states, not machined, is good when the pouring temperature is high. Leakage by internal shrinkage cavities decreases remarkably when melting temperatures are over 1530°C. (2) Mass effect on hardness ; mass effects decrease when the melting temperature becomes higher. (3) About carbon pick up ; it increased according as the melting temperature rised when we studied about the behaviour of carbon in the cupola, and therefore, I proposed my ideas about construction and operation of the cupola.
