Chill casting - without blow hole formation by casting into a mould having a retractable rod

摘要

Chill casting by connecting the casting ladle opening to the mouth of the mould. The entrance to the mould is blocked by a rod until the ladle is full and then the rod is retracted allowing the metal to flow into the mould. After cooling and shrinking the casting is removed. Air is prevented from mixing with the molten metal and cannot become trapped in the casting. Thus a further hot drawing treatment is unnecessary.