Patent ID: 9192988
Filing Date: 2015-11-24
Classification: B22C,B22D

Abstract:
1. A method for varying rate of delivery of molten metal in a casting process, comprising: providing a mold apparatus, the mold apparatus including: a mold; a conduit configured to deliver molten metal to the mold, the conduit controllably occluded by a control pin; a positioner coupled to the control pin; a level sensor configured to sense level of molten metal in the mold; and a controller coupled with the positioner and the level sensor, the controller configured to accept input in the form of at least a metal level setpoint; and providing via the controller, to the positioner, a command signal that includes a plurality of pulses that modulate flow or flow rate of molten metal through the conduit such that the level of molten metal in the mold remains in a molten metal level range of between 5 mm above and 3 mm below, inclusive, the metal level setpoint and such that the level of the molten metal in the mold is increased so as to exceed the metal level setpoint by less than 5 mm above the metal level setpoint as a result of each pulse of the plurality of pulses.