Levitation melting method and melting and casting method

摘要

Disclosed is a levitation melting method comprising applying a high-frequency current to a high-frequency induction coil (20) wound around a melting crucible (12) to induction-heat a material (22) introduced to the melting crucible (12); and erecting the resulting molten metal (22a) to be in no contact with the inner wall surface of the melting crucible (12) with the bottom of the material (22) being maintained in the solidified state; wherein a power input P (kw) of a high-frequency power source to the high-frequency induction coil (20), an inner radius R (mm) at the bottom of the crucible (12) and super heat DELTA T ( DEG C) of the molten metal (22a) satisfy the relationship of P/R2 = DELTA T.(0.0008 to 0.002), as well as, a melting and casting method for casting the molten metal prepared by the levitation melting method described above into a mold using a snout (26) suspended above the melting crucible such that the lower end of the snout (26) may be submerged in the molten metal (22a).