APPARATUS FOR PRODUCING ULTRA-QUICKLY COOLED THIN ALLOY STRIP

摘要

PURPOSE:To decrease the thickness of a thin strip by specifying the slit center of a crucible with respect to a cooling roll and making the backward wall thickness of the slit smaller than the width of the slit. CONSTITUTION:A metal mmelted in the heated crucible 7 is ejected onto the cooling roll 3 under rotation from a nozzle 2 having the slit 1 in the bottom, by which the thin metallic strip 8 is obtd. The center of the slit 1 is disposed forward in the rotating direction from the vertical line running the rotating shaft 4 of the roll 3. The backward wall thickness in the rotating direction of the slit 1 at the top end of the nozzle 2 is made smaller than the width of the slit 1 so that the angle theta between the vertical line running the shaft 4 and the straight line connecting the rear edge side of the slit 1 and the shaft 4 has the relation 15 deg.theta3 deg.. The space between the nozzle 2 and the roll 3 is thus narrowed and the thickness of the thin strip is decreased.