Apparatus and method for sidewall containment of molten metal with horizontal alternating magnetic fields
AssigneeInland Steel Company
InventorWalter F. Praeg
Life of this patent
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Abstract
Molten metal, in the gap between two counter-rotating rolls of a continuous strip-casting apparatus, is prevented from leaking out of an open side of the gap by a magnetic confining apparatus which produces a horizontal magnetic field extending through the open side of the gap. The apparatus includes structure for confining the magnetic field substantially to the open side of the gap and for preventing dissipation of the magnetic field away from the open side of the gap.
Claims65
A magnetic confining apparatus for preventing the escape of molten metal through an open side of a vertically extending gap between two horizontally spaced members and between which said molten metal is located, said apparatus comprising:
- magnetic core means;
- electrically conductive coil means operatively associated with said magnetic core means;
- said magnetic core means comprising a pair of horizontally disposed, spaced, magnet poles disposed adjacent the open side of said gap for generating a mainly horizontal magnetic field which extends through the open side of said gap to said molten metal;
- said magnet poles being sufficiently proximate to said open side of the gap so that said generated horizontal magnetic field has a strength sufficient to exert a confining pressure against the molten metal in the gap;
- and
- an inner, non-magnetic, electrically conductive shield means disposed between the magnet poles adjacent to the open side of the gap, and shaped to confine the horizontal magnetic field through the gap substantially to the molten metal.
A magnetic confining apparatus for preventing the escape of molten metal through the open side of a vertically extending gap between two horizontally spaced rollers, between which said molten metal is located, said apparatus comprising:
- roller mounted, annular-shaped ferromagnetic material disposed adjacent to the open side of said gap;
- a stationary magnet, having a pair of magnetic poles for generating, at a location proximate to sa annular-shaped roller mounted ferromagnetic material, an alternating horizontal magnetic field which extends through the annular-shaped material to the open side of said gap to said molten metal;
- a shaped inner, electrically conductive shield disposed between the magnet poles and adjacent to said gap to confine said magnetic field to said open side of said gap and to provide said horizontal magnetic field with a strength sufficient to exert a confining electromagnetic pressure against the molten metal in said gap.
A magnetic confining apparatus for preventing the escape of molten metal through the open side of a vertically extending gap between two horizontally spaced members, between which said molten metal is located, said apparatus comprising:
- magnetic core means, having a pair of spaced, cooperating magnet poles adjacent to the open side of said gap;
- electrically conductive coil means operatively associated with said magnetic core means for generating a horizontal magnetic field which extends through the open side of said gap to said molten metal from said pair of spaced magnet poles;
- a shaped inner non-magnetic conductor shield disposed between the magnet poles and adjacent to said gap to confine said magnetic field to said open side of said gap, and thereby generating said horizontal magnetic field with strength sufficient to exert a confining pressure against the molten metal in said gap.
A magnetic confining method for preventing the escape of molten metal through the open side of a vertically extending gap between two horizontally spaced members and between which said molten metal is located, said method comprising the steps of:
- disposing a pair of spaced, cooperating magnet poles adjacent to the open side of said gap;
- generating, at a location adjacent the open side of said gap, a horizontal magnetic field which extends through the open side of said gap to said molten metal from said pair of spaced magnet poles;
- generating said horizontal magnetic field sufficiently proximate to said open side of the gap so that said horizontal magnetic field has a strength sufficient to exert a confining pressure against the molten metal in said gap;
- and
- confining said magnetic field to said open side of the gap by disposing a shaped inner non-magnetic conductor between the magnet poles and adjacent to said gap.
A magnetic confining method for preventing the escape of molten metal through an open side of a vertically extending gap between two horizontally spaced non-magnetic conductive members and between which said molten metal is located, said method comprising the steps of:
- disposing a pair of spaced, cooperating magnet poles adjacent to the open side of the gap and set back from non-magnetic edges of the horizontally spaced conductive members and having a wider spacing than the spacing of the edges of the conductive members, and generating, at a location adjacent the open side of said gap, a magnetic field that is larger than required for sidewall containment of the molten metal while limiting the amount of push back of the molten metal by the magnetic flux shielding effect of the conductive members, and disposing an inner, non-magnetic, electrically conductive shield means between the magnetic poles adjacent to the open side of the gap.
Dependencies are inferred from the claim text.