| 摘要 |
<p>: 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 driving 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 solidification 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 stressed 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 conventional roll casters, the present caster has larger-diameter casting rolls, which are driven at a faster speed, and the tip is set back farther from the rolls centerline. The resultant cast product is vastly superior to anything produced by prior casters.</p> |
