Metal founding – Combined
Patent
1974-07-31
1976-06-22
Husar, Francis S.
Metal founding
Combined
164 87, B22D 1106
Patent
active
039649636
ABSTRACT:
A system for continuously casting substantially rigid metallic sheet is disclosed wherein a continuous stream of molten metal is fed into a plenum chamber, the metal directed into the nip between spaced casting members with at least one having recesses in the surface to provide a pattern of spaced projections on at least one side of the sheet. The pressure of the molten metal is only sufficient to cause the metal to fill the major portion of the chamber and the casting members are cooled sufficient to place the solidification point of the molten metal at the projections to cause a progressive laying on of the metal and prevention of the rupture of the formed meniscus adjacent the nozzle orifice. The apex of each recess in the process at the point of laying on is momentarily at a maximum from about 17 to 200 percent greater than the nominal spacing at the nip of the members and the depth of the recess is at least about 5 percent of said nominal spacing but not greater than about 100 percent. Three dimensional (volume) shrinkage of approximately 12 percent occurs in the metal from the point of liquidity to the point of solidification, and consequently an equal (12% minimum) reduction in thickness or squeezing of the metal is selected to offset this phenomenon and thereby produce sheet and projection structure free of cracks, especially in the longitudinal direction. The projections preferably cover between 20 and 50 percent of the total sheet area and are frusto-conical in shape with sides slanted between 5 degrees and 30 degrees. The projections are formed by progressive laying on and solidification of liquid metal and are free of cross-bands and are between about 5 and 100 percent of the nominal thickness of the sheet.
REFERENCES:
patent: 49053 (1865-07-01), Bessemer
patent: 1524610 (1925-01-01), Ahlgren
patent: 1690887 (1928-11-01), Davis
patent: 3089191 (1963-05-01), Conrad
Brown John S.
Husar Francis S.
Martin Marietta Aluminum Inc.
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