Patent ID: 7497989
Filing Date: 2009-03-03
Classification: B22D

Abstract:
1. A pressure pour furnace for discharge of a dose of a molten metal, the pressure pour furnace comprising: a receiving chamber for receiving the molten metal from a source of the molten metal; a heating chamber having an at least partially open inlet connected to the receiving chamber, the heating chamber having a means for heating the molten metal to a suitable temperature; a pressure chamber having an at least one sealing port to control a flow of the molten metal from the heating chamber to the pressure chamber; a sealing means for insertion into, or removal from, each of the at least one sealing port to prevent the flow of the molten metal through the sealing port, or to allow the flow of the molten metal through the sealing port; a dosing tube protruding through a dosing tube opening in a wall of the pressure chamber; a bellows attached at a first end to the wall of the pressure chamber around the dosing tube opening and attached at a second end to the outside of the dosing tube to provide a pressurized seal around the dosing tube opening; a means for injecting a gas into the pressure chamber to force the molten metal in the pressure chamber out of the pressure chamber through the dosing tube; and a means for venting the pressure chamber to atmospheric pressure.