Bottom blocks for electromagnetic casting
AssigneeOlin Corporation
InventorsJohn C. Yarwood, Derek E. Tyler
Life of this patent
Estimating the term…
Abstract
A bottom block for use in electromagnetic casting of metals wherein the block is constructed of a material having a closely matched electrical resistivity to that of the metal to be cast. The block may be provided with a deeply hollowed out central section so that during startup the end of the down spout supplying molten metal may be positioned a substantial distance below the plane of the top surface of the bottom block.
Claims16
In a process for casting a metal by electromagnetically containing and forming molten metal into a desired shape, said electromagnetic containing and forming including the steps of pouring molten metal into a bottom block, providing an inductor for applying a magnetic field to said molten metal, and applying an alternating current to said inductor to generate said magnetic field, said inductor in operation being spaced from said molten metal by a gap extending from the surface of the molten metal to the opposing surface of the inductor, the improvement wherein said process further comprises:
- closely matching the electrical resistivity of said bottom block to the electrical resistivity of the metal to be cast,
- whereby during start up advantageous containment of the initial surge of molten metal is accomplished.
In a process for casting a metal by electromagnetically containing and forming molten metal into a desired shape, said electromagnetic containing and forming including the steps of pouring molten metal from a spout into a bottom block, providing an inductor for applying a magnetic field to said molten metal and applying an alternating current to said inductor to generate said magnetic field, said inductor in operation being spaced from said molten metal by a gap extending from the surface of the molten metal to the opposing surface of the inductor, the improvement wherein said process further comprises:
- providing a bottom block having a continuously curved deeply hollowed out central section in the top surface thereof, said hollowed out central section having a contour which approximates the contour of the steady state solidification front of said shape,
- whereby the initial surge of molten metal into the casting apparatus during start up can be restrained thereby preventing run out of the molten metal.
Dependencies are inferred from the claim text.