Patent ID: 6070647
Filing Date: 2000-06-06
Classification: B22D

Abstract:
A method of casting metal strip comprising:introducing molten metal between a pair of chilled casting rolls via an elongate metal delivery nozzle disposed above and extending along the nip between the rolls to form a casting pool of molten metal supported above the nip and confined at the ends of the nip by pool confining end closures, androtating the rolls so as to cast a solidified strip delivered downwardly from the nip;wherein the metal delivery nozzle comprises an upwardly opening elongate trough having a floor and side walls extending longitudinally of the nip to receive the molten metal, the longitudinal side walls of the trough are provided with side outlet openings through which the molten metal is caused to flow from the trough, the bottom floor of the trough is provided with upstanding and longitudinally extending flow barrier walls adjacent the side outlet openings and the method further comprises causing the molten metal to fall in a series of discrete free falling streams spaced apart along the delivery nozzle into the trough between said flow barrier walls such that the streams impinge on the floor of the trough at locations spaced apart longitudinally of the trough and flow outwardly against the barrier walls and thereafter flow over the barrier walls and laterally outwardly through the side outlet openings of the nozzle in laterally outwardly directed jet streams so as to impinge on the cooling surfaces of the rolls in the immediate vicinity of the pool surface across the length of the delivery nozzle.