초록 ▼

A two-chamber furnace for the low pressure countergravity casting of metal wherein the first chamber is a molten metal supply chamber connected by a submerged orifice closable by a stopper rod valve to a sealed second chamber that is pressurizable to fill a superjacent mold. The stopper rod valve is

A two-chamber furnace for the low pressure countergravity casting of metal wherein the first chamber is a molten metal supply chamber connected by a submerged orifice closable by a stopper rod valve to a sealed second chamber that is pressurizable to fill a superjacent mold. The stopper rod valve is readily replaceable from the top of the furnace without having to empty the melt from the furnace.

대표청구항 ▼

[ We claim:] [1.] A furnace for holding molten metal and dispensing said metal to a mold, said furnace comprising a first chamber for holding a quantity of said metal; a gas pressurizable second chamber adjacent said first chamber for dispensing said metal to said mold under super ambient pressure c

[ We claim:] [1.] A furnace for holding molten metal and dispensing said metal to a mold, said furnace comprising a first chamber for holding a quantity of said metal; a gas pressurizable second chamber adjacent said first chamber for dispensing said metal to said mold under super ambient pressure conditions; a partition interjacent said first and second chambers for isolating said chambers one from the other; an opening in said partition communicating said first and second chambers, said opening being located near the bottom of said second chamber for admitting said metal into said second chamber beneath the level of molten metal in said second chamber; at least one immersion heater adjacent said opening in said first chamber; at least one immersion heater adjacent said opening in said second chamber; a stopper-rod valve operatively associated with said opening to permit metal to flow from said first chamber into said second chamber via said opening when said valve is open and prevent such flow when said valve is closed; a gas inlet to said second chamber for admitting sufficient pressurized gas into said second chamber to displace molten metal therein externally of said second chamber; and an outlet form said second chamber for discharging molten metal displaced by said gas from said second chamber into said mold.