Patent ID: 8910699
Filing Date: 2014-12-16
Classification: B22D

Abstract:
1. A method of centrifugally casting an object from a container of molten metal, said molten metal having a liquidus arrest temperature and, when poured, a pour temperature, comprising: measuring the liquidus arrest temperature of the molten metal in the container; pouring the molten metal into a trough to deliver the molten metal to a rotating mold for a predetermined period of time, said predetermined period comprising a plurality of time segments; measuring the pour temperature of the molten metal poured into the trough; calculating fluidity of the molten metal based upon the measured liquidus arrest temperature and measured pour temperature; and moving the mold relative to the trough to dispose molten metal into the mold, wherein said movement is controlled based on said calculated fluidity and in accordance with a transfer function relating fluidity to volumetric requirements for an object of predetermined specifications on said mold, to deliver a volume of molten metal to said mold to cast said object in accordance with said predetermined specifications, wherein said transfer function comprises a plurality of equations, each said equation corresponding to an identified segment of said plurality of time segments, said equations comprising: (a) a first delay equation corresponding to a time segment from when molten metal leaves the end of the trough until a predetermined volume of molten metal is disposed in the mold; (b) a first acceleration equation corresponding to a time segment in which the flow rate of said molten metal in said trough increases after said predetermined volume of molten metal reaches said mold; and (c) a first deceleration equation corresponding to a time segment in which the flow rate of said molten metal in said trough decreases.