An improved method for fluidity measurement by gravity casting of spirals in sand moulds

Abstract

This study describes a new equipment for gravity casting of fluidity spirals in a sand mould. The fundamental characteristic of the equipment is a constant pouring temperature, which gives a constant melt superheat and since the molten metal is poured into the spiral sand mould from the same height, the equipment gives a constant initial pressure head and pouring velocity. By comparing data from an earlier version of the equipment, an improvement in reproducibility has been shown. The effect of melt superheat on fluidity has been measured by the new improved equipment and has been confirmed to increase linearly with increasing melt superheat.