To provide a tapping method capable of suppressing adherence and coagulation of a molten metal on a tapping nozzle portion, particularly a portion around its tip part, by accelerating a molten metal tapping rate under certain conditions causing no other problem from start of tapping to finish thereof when melting a raw material metal corresponding to one batch in a cold crucible melting furnace and pouring molten metal tapped from a tapping nozzle into a mold.
The tapping method in a cold crucible melting furnace includes: using the cold crucible melting furnace, the tapping nozzle installed on the body bottom of the cold crucible melting furnace and a mold disposed below the tapping nozzle; melting the raw material metal in the melting furnace; tapping the molten metal from the tapping nozzle; and pouring the molten metal into the mold. The method is characterized by constantly applying to the tapping molten metal toward a tapping direction, a certain differential pressure corresponding to 20-80% of a head pressure applied to the tapping nozzle at tapping start.
YAMAMOTO KAZUMI
CHUJOYA MAKOTO
AKIYOSHI TETSUO
MURASE YOSHIMI
