PURPOSE:To make it possible optimize plasma nitriding condition according to uses and to improve hardness, wear resistance, galling resistance because plasma nitridation accelerating element is mixed without accelerating oxidation and homogenizing can be performed. CONSTITUTION:In a vacuum melting and solidifying device to produce metal or metallic base composite material provided with a high frequency induction melting furnace 2 provided with a means possible to tilt and tap in a vacuum tank 1 and arranged with a casting mold 3 for receiving molten metal at a forward position A faced by a tilting and tapping hole 2a, a casting mold 3 containing a heating medium crucible 4 is mounted on a head end of a vertically reciprocating axis 5, enclosed with an induction heating coil 6 to preheat the melt in the crucible 4 at the forward position A and enclosed with an electromagnetic stirring coil 7 to stir the melt in the crucible 4 at a position B below the axial direction, and a door 8 to carry away and in the molding die is mounted on the side wall below or above the position of the electromagnetic stirring coil 7, further, a partitioning valve 9 is provided between the position of the induction heating coil 6 and the position of electromagnetic stirring coil 7.
展开▼
