JPS57146453A - Rolling roll - Google Patents

Abstract

PURPOSE: To obtain a rolling roll of internally water-cooled construction for quick freezing of molten metal suited for mass production of the sheets having high dimensional accuracy by forming the surface layer of said roll of an alloy having the specific hardness and heat conductivity.

CONSTITUTION: A rolling roll of which at least the surface layer in contact with a material to be rolled consists of an alloy of ≥300Hv hardness and ≥0.17cal/ cm.S.°C heat conductivity at 20°C and which has the internally water-cooled construction. This roll is better in heat conductivity than conventional alloy tool steel rolls, and has the hardness higher than that of pure copper rolls. If the heat conductivity is below said numerical values, no water cooling effect is provided despite the incorporation of the internally water-cooled construction, and the surface temp. of the rolls increases sharply. Hence, the thickness of the plates that can be produced is limited. In addition, the surface temp. of the roll does not lower and therefore, seizure occurs, and the mass production is infeasible. On the other hand, if the hardness is below said numerical value, the variance in plate thickness is generated like with conventional pure copper rolls. There is Be copper or Al bronze subjected to age-hardening as the alloy that satisfies said conditions.

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