Patent ID: 6688151
Filing Date: 2004-02-10
Classification: B21B

Abstract:
A work roll shift apparatus for a cluster mill, adapted to shift a chockless work roll of the cluster mill having the chockless work rolls, comprising:lever arms each supported at one end by a chock of rolls adjacent to the chockless work roll, and provided so as to be horizontally pivotable about a line perpendicular to an axis line of the work roll; roll shifting cylinders each connected to a lever arm so as to pivot the lever arm; thrust bearings each provided on a lever arm and opposed to an end of the work roll; shift amount detecting means each provided in the chock of the rolls for detecting a shift amount of the thrust bearing; and a control unit for driving the roll shifting cylinder so as to maintain a clearance between the work roll and the thrust bearings and obtain a target roll shift position based on a shift amount performance value of the thrust bearing obtained by the shift amount detecting means.