Abstract
In cupola melting, the effects of blast volume and melting temperature to the shrinkage cavities were studied, and the following results were obtained.
(1) Shrinkage cavities are caused by the oxidation largely. Therefore in low blast volume a sound casting is obtained.
(2) Near the standard blast volume, shrinkage cavity begins to occur, but its degree is affected by melting temperature.
(3) In high melting temperature about 1450°C, inner shrinkage cavity is smaller than in medium melting temperature about 1400°C. Therefore the high temperature melting is necessary to obtain a sound casting.
(4) Outside shrinkage cavity occurs reversely. That is, in high melting temperature it is larger than in medium melting temperature.
(5) In low melting temperature the bad result is obtained in every blast volume.
