METHOD FOR FORMING DIMPLE ON SURFACE OF CASTING ROLLS OF TWIN ROLL STRIP CASTER

摘要

PURPOSE: A method is provided which treats the surface of casting rolls of a twin roll strip caster so that the dimple circumferential part of the casting rolls has a gentle curvature, and the dimple-dimple surface part of the casting rolls has a fine surface roughness. CONSTITUTION: The method for forming dimple on the surface of casting rolls of a twin roll strip caster comprises the steps of first etching the surface of the casting rolls by an ordinary photo etching method; cleaning the casting rolls after removing a film formed on the etched casting rolls using an alkaline aqueous solution; and second etching the surface of the casting rolls using a second etching equipment(20) equipped with a plurality of spray nozzles(22) spraying an etchant from the inside of a chamber(21), a spray nozzle transfer device(23) horizontally transferring the spray nozzles and a roll driving unit which is installed inside the chamber so as to rotate the casting rolls forwardly and reversely, thereby forming dimple having a gentle curvature on the circumferential part of the casting rolls, and giving fine roughness on the dimple-dimple surface part of the casting rolls.