PURPOSE: To cast the desired semi-molten metal at the desired casting velocity by separately executing structure control of molten metal with rotor stirring and flow rate control of the molten metal with pressurized gas.
CONSTITUTION: The molten metal 3a of Sn-Pb alloy is charged into a ladle 2 and an air-sealed pipe 4 is inserted into the apparatus 10 and inert gas is supplied through gas supplying tube 14. By descending the rotor 26, a molten metal flow passage 23 is closed and the molten metal 3a is supplied into a vessel 16 through the pipe 4. The molten metal is heated with a heater 18 and the temp. to suitable temp. range between the solidius and the liquidus is adjusted to make the semi-molten metal 3b. By rotating the rotor 26 with the prescribed number of revolutions, coarsening of crystal grain caused by growing the dendritic crystal is prevented to make the specific crystal line grain size. Viscosity of the molten metal is detected with a detector 32 and gas supplying rate is decided by operating with a control part in gas supplying device 34. A nozzle 20 is heated with a heater 22 and by rotating one side of the rotor 26, the nozzle is ascended to open the flow passage 23 and the molten metal is cast into a mold 6 from the discharging hole 24 with gas pressure. By this method, without mutually interferencing with the structure control and the flow rate control of the molten metal, the casting is executed.
YAMAGAMI JUN
TOYODA KOJI
