METHOD AND DEVICE FOR CHANGING MOLD WIDTH IN CONTINUOUS CASTING IMPRESSING STATIC MAGNETIC FIELD

PURPOSE:To prevent the development of scratch on surfaces of long side walls in a mold at the time of executing width change in the continuous casting mold during casting by shifting the long side walls along width direction of short side walls in the mold as the releasing holding force of the long side wall in the mold inserting the short side walls in the mold. CONSTITUTION:A holding force releasing mechanism 5 is provided with a holding conversion force converting means for converting suction force in mutual long side walls 1b generated by the impression of static magnetic field into an increase in the holding force, a holding force adding means for adding the preset holding force converted by the converting means and a holding force control means for controlling the holding force based on the value obtd. by the adding means. By the holding force releasing mechanism 5, at least one side of the long side walls 1a, 1b is made to stretch in mutually separating direction so as to eliminate influence of magnetic suction force at the time of changing the width L in the continuous casting mold M. Therefore, in the case of shifting the short side walls 2a, 2b, too, the scratch on the surface of long side walls 1a, 1b is not developed.