PURPOSE: To restrain the development of oxide by supplying inert gas near the outlet of molten metal flow for a fixed time after stopping the supply of the molten metal since the molten metal starts to rise in a molten metal supplying pipe and making the part near the outlet of molten metal flow passage an inert gas concd. atmosphere condition.
CONSTITUTION: The molten metal 1 is stored in a pressurizing type molten metal supplying furnace 17. When the molten metal supplying control device 5 commands the supply of molten metal, the inert gas is supplied from a pressurizing hole 6 to pressurize the inner part of the furnace 17. The molten metal 1 flows into a trough 21 from a molten metal outflow hole 14 through a molten metal inflow hole 15 and a molten metal supplying tube 16 and supplied to a die casting machine. When the molten metal supplying control device 5 commands the supply of molten metal, the inert gas is supplied from an inert gas nozzle pipe 22 to the molten metal outflow hole 14 and the trough 21 to make the part near the molten metal outflow hole 14 and the part near the molten metal passage of the trough 21 an inert gas concd. atmosphere condition. Successively, when the molten metal supplying control device 5 commands stopping to the molten metal supply, after the lapse of a fixed time, the supply of inert gas is stopped to save the consumption of inert gas. Therefore, the formation of sandwich-like obstinate laminated films can be restrained.
YOSHIKOSHI KAZUO
YOSHIOKA KOICHI
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