ELECTROMAGNETIC FLOAT-UP MELTING FURNACE

PURPOSE:To improve the heating efficiency by winding a heating coil applying water- proof insulated coating on the outer periphery of a segment as a melting chamber, surrounding this segment with an outer frame for circulating cooling water and dipping this heating coil into the cooling water to narrow the interval between the heating coil and molten metal. CONSTITUTION:The outer periphery of the segment 14 to be as the melting chamber 2 formed of a copper-made cylinder 13 whose upper part is open is surrounded integrally with the outer frame 16 circulating the cooling water 15 and formed of a water-tight structure. This segment 14 is arranged with plural slits 17 radially in the longitudinal direction at an interval along the peripheral direction on the outer wall of the copper- made cylinder 13. This segment 14 has the structure with a formed ceramic thermal- spraying layer 19 on the inner wall and closed with embedded small ceramics 18 so that the cooling water 15 does not flow out into the segment 14. The heating coils 1 applied with the water-proof insulated coating 27 on the outer peripheries of their water-cooling copper pipes 26, are wound on the outer periphery of the segment 26 and dipped into the cooling water 15. By this constitution, the interval delta between the heating coil 1 and the molten metal 12, is narrowed and the heating efficiency of the heating coil 1 is improved.