| 摘要 |
PURPOSE:To improve quality by providing a heat resistant plate having many holes right above a molten metal ejection nozzle, inserting a carbon ring thereunder and heating the carbon ring with a high-frequency furnace. CONSTITUTION:The heat resistant plate 8 having the many holes is disposed as a furnace material in a molten metal supply pipe 1 and the carbon ring 11 is inserted as a getter material to the under side thereof so as not to contact directly with a molten metal 2' and the pipe 1. A raw material metal is charged onto the plate 8 and while gaseous Ar is introduced into the pipe 1 from the upper part thereof, the metal is heated together with the ring 11 with the high- frequency heating furnace 4. After the raw material melts, the pipe 1 is lowered to exert pressure to the molten metal 2', thereby ejecting the metal from the nozzle. The ring 11 acts as the getter material in this stage to prevent the formation of an oxide film on the metal 2'. The ejection of the molten metal 2' is thereby stabilized and the quality is improved. |
