Patent ID: 6460604
Filing Date: 2002-10-08
Classification: B22D

Abstract:
An apparatus for uphill low pressure casting of molten metal in sand moulds conveyed synchronously comprising:a casting station located at a conveyor; a gas pressure holding furnace containing the molten metal, located at the casting station and including a rising casting tube connectable to the sand moulds; and a device for refilling the holding furnace with molten metal including at least one pressure-tight melt container which is moveable relative to the casting station and is replaceable with another pressure-tight container; a filling tube located in the holding furnace with a seal located outside the filling tube with the melt container being selectively connectable in a pressure-tight manner by a bottom outlet to the filling tube of the holding furnace, the holding furnace being connected to the melt container by a pneumatic pressure compensating line to prevent a pressure difference between the holding furnace and the melt container to avoid influence of the casting processing during the flow of molten metal into the holding furnace; and wherein the seal located outside the filling tube is controllable as a function of a conveying cycle of the same moulds, the filling tube terminates in proximity to a bottom in the holding furnace, the filling tube is mounted on the holding furnace by a cardan mount, and the melt container includes a seal at the bottom outlet and is pretensioned with pressurized gas prior to coupling to the filling tube and connection to the pneumatic pressure compensating line.