B - Operations – Transporting – 22 – D
Patent
B - Operations, Transporting
22
D
22/168, 22/54
B22D 11/06 (2006.01)
Patent
CA 1069669
ABSTRACT OF THE INVENTION: A method and apparatus for producing extremely fine-grained aluminum sheet in a casting machine having a pair of parallel casting rolls, a pouring tip on the entrance of the rolls, and means for driv- ing the rolls. Molten aluminum is poured through the tip into the space between the rolls, and the rolls are driven at a speed such that solidi- fication of the metal is completed at a point ahead of the centerline of the rolls, and the frozen metal is then hot-rolled down to the thickness of the roll spacing, During this hot-rolling, the metal is heavily stress- ed internally by being reduced at least 33% of the thickness at the point of solidification, and this destroys the "as cast" crystal structure and causes complete recrystallization to take place, As compared with con- ventional roll casters, the present caster has larger-diameter casting rolls, which are driven at a faster speed, and the tip is set back far- ther from the rolls centerline. The resultant cast product is vastly su- perior to anything produced by prior casters. -1-
242287
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