ROLLING APPARATUS FOR STEEL PLATE WITH DIFFERENT THICKNESS AND ROLLING METHOD FOR STEEL PLATE WITH DIFFERENT THICKNESS USING THE SAME

摘要

The present invention relates to a plate rolling device having a different thickness and a plate rolling method having the different thickness using the same, wherein the method comprises a rough rolling step, an intermediate rolling step, and a finishing rolling step to form a first blade plate part of a first reference thickness. By forming a second blade part having a second reference thickness smaller than the first reference thickness on the front side while moving the first blade part in a reverse direction after narrowing a gap between an upper rolling roll member and a lower rolling roll member, material design limit by setting two target thickness in a blade plate is minimized, thereby being capable of minimizing a loss of recovery rate due to minimization of the step length of the boundary with respect to the different thickness, and being capable of mass producing due to the identification of the stepped part.