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Title: Electromagnetic augmentation for casting of thin metal sheets

Abstract

Thin metal sheets are cast by magnetically levitating molten metal deposited in a mold within a ferromagnetic yoke and between AC conducting coils and linearly displacing the magnetically levitated liquid metal while it is being cooled by the water-cooled walls of the mold to form a solid metal sheet. A conducting shield is electrically coupled to the molten metal sheet to provide a return path for eddy currents induced in the metal sheet by the current in the AC conducting coils. In another embodiment, a DC conducting coil is coupled to the metal sheet for providing a direct current therein which interacts with the magnetic field to levitate the moving metal sheet. Levitation of the metal sheet in both molten and solid forms reduces its contact pressure with the mold walls while maintaining sufficient engagement therebetween to permit efficient conductive cooling by the mold through which a coolant fluid may be circulated. The magnetic fields associated with the currents in the aforementioned coils levitate the molten metal sheet while the mold provides for its lateral and vertical confinement. A leader sheet having electromagnetic characteristics similar to those of the molten metal sheet is used to start the casing process andmore » precedes the molten metal sheet through the yoke/coil arrangement and mold and forms a continuous sheet therewith. The yoke/coil arrangement may be either U-shaped with a single racetrack coil or may be rectangular with a pair of spaced, facing bedstead coils.« less

Inventors:
 [1]
  1. Hinsdale, IL
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
OSTI Identifier:
867027
Patent Number(s):
US 4846255
Assignee:
United States of America as represented by United States (Washington, DC)
DOE Contract Number:  
W-31109-ENG-38
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
electromagnetic; augmentation; casting; metal; sheets; cast; magnetically; levitating; molten; deposited; mold; ferromagnetic; yoke; conducting; coils; linearly; displacing; levitated; liquid; cooled; water-cooled; walls; form; solid; sheet; shield; electrically; coupled; provide; return; path; eddy; currents; induced; current; embodiment; dc; coil; providing; direct; therein; interacts; magnetic; field; levitate; moving; levitation; forms; reduces; contact; pressure; maintaining; sufficient; engagement; therebetween; permit; efficient; conductive; cooling; coolant; fluid; circulated; fields; associated; aforementioned; provides; lateral; vertical; confinement; leader; characteristics; similar; start; casing; process; precedes; arrangement; continuous; therewith; u-shaped; single; racetrack; rectangular; pair; spaced; facing; bedstead; conducting shield; return path; continuous sheet; solid form; metal sheets; characteristics similar; eddy current; direct current; molten metal; magnetic field; liquid metal; magnetic fields; metal sheet; eddy currents; solid metal; contact pressure; coolant fluid; magnetically levitated; metal deposited; electrically coupled; racetrack coil; moving metal; sheet therewith; single racetrack; bedstead coils; levitated liquid; leader sheet; maintaining sufficient; coil arrangement; currents induced; conducting coils; metal deposit; ferromagnetic yoke; facing bedstead; electromagnetic characteristics; magnetic characteristic; linearly displacing; /164/

Citation Formats

Hull, John R. Electromagnetic augmentation for casting of thin metal sheets. United States: N. p., 1989. Web.
Hull, John R. Electromagnetic augmentation for casting of thin metal sheets. United States.
Hull, John R. 1989. "Electromagnetic augmentation for casting of thin metal sheets". United States. https://www.osti.gov/servlets/purl/867027.
@article{osti_867027,
title = {Electromagnetic augmentation for casting of thin metal sheets},
author = {Hull, John R},
abstractNote = {Thin metal sheets are cast by magnetically levitating molten metal deposited in a mold within a ferromagnetic yoke and between AC conducting coils and linearly displacing the magnetically levitated liquid metal while it is being cooled by the water-cooled walls of the mold to form a solid metal sheet. A conducting shield is electrically coupled to the molten metal sheet to provide a return path for eddy currents induced in the metal sheet by the current in the AC conducting coils. In another embodiment, a DC conducting coil is coupled to the metal sheet for providing a direct current therein which interacts with the magnetic field to levitate the moving metal sheet. Levitation of the metal sheet in both molten and solid forms reduces its contact pressure with the mold walls while maintaining sufficient engagement therebetween to permit efficient conductive cooling by the mold through which a coolant fluid may be circulated. The magnetic fields associated with the currents in the aforementioned coils levitate the molten metal sheet while the mold provides for its lateral and vertical confinement. A leader sheet having electromagnetic characteristics similar to those of the molten metal sheet is used to start the casing process and precedes the molten metal sheet through the yoke/coil arrangement and mold and forms a continuous sheet therewith. The yoke/coil arrangement may be either U-shaped with a single racetrack coil or may be rectangular with a pair of spaced, facing bedstead coils.},
doi = {},
url = {https://www.osti.gov/biblio/867027}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1989},
month = {1}
}