PREVENTING METHOD FOR CAMBER OF TWO-LAYERS CLAD METALLIC PLATE

摘要

PURPOSE:To straighten surely the camber of a two-layers clad metallic plate consisting of a base metal and cladding metal by cooling forcibly the metal side of the metallic plate where the rate of thermal shrinkage is larger upon ending of the rolling of said plate then straightening the plate by rolls. CONSTITUTION:A radiation thermometer 12 measures the temp. on the top and bottom surfaces of the clad steel plate 1 upon ending of the rolling of the plate 1 by a rolling mill 10 and the result thereof is transmitted to a controller 15. The controller 15 detects the rate of the thermal shrinkage arising in the base metal of the base metal temp. Tc during the time until said metal attains the ordinary temp. according to the coefft. of linear expansion on the base of the base metal temp. Tc of the plate 1 and determines the cladding metal temp. Ts of the cladding metal at which the rate of thermal expansion equal to such rate of the thermal expansion arises until the cladding metal attains the ordinary temp. The controller calculates further the cooling water flow rate and work roll speed necessary for cooling forcibly the metallic side where the rate of the thermal shrinkage is higher so as to generate the temp. difference Tc-Ts between the base metal and cladding metal of the plate 1. A flow rate control valve 14 and work rolls 10A are driven and controlled in accordance with the result of such calculation by which the straightening of the clad steel plate 1 is repeated.