JPS54106068A - Roller leveler - Google Patents

Abstract

PURPOSE: To make free even the thick plate from the stretch due to the slip between the roller and the material to be straightened, at correcting the shape through the plastic deformation depending on the repeated bendings of the material to be straightened with rollers zigzag arranged above and under the material to be straightened, by providing a difference in the diameter of rollers correspondingly to the rate of plastic deformation.

CONSTITUTION: At carrying out the plastic deformation through giving repeated bendings to the material 2 to be straightened with the correcting rollers 1 arranged zigzag, a difference in the diameter of rollers is given to each of No.1W9 correcting rollers 1: hereupon, above difference in the diameter of rollers is determined by the following formula. That is, if the diameter of the reference roller is taken as D_i, the rate of plastic deformation by this reference roller is taken as α_i, the diameter of roller for giving the diameter difference is taken as D_j, the rate of plastic defor mation by this roller is taken as α_j, and the yield strain of the material to be straightened is taken as ε_s, the diameter difference of the roller is determined by (D_i-D_j)/D_i={1/(1-α_i)-1/(1-α_j)}.ε_s. According to this method, the roller is prevented from the great torsional moment, the wear of the roll is reduced, and the life of the roll is extended.

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