Using Experimental Procedure to Improve the Efficiency of the Two Stand Reversing Cold Mill

Production of thin steel strips with 0.18-0.26 mm thickness is about 0.75 of annual production of the two stand reversing cold mill, while its efficiency is 60%. This is due to the fact that after montaging the grinded work rolls, rolling thin steel strips (with thicknesses less than 0.18 millimeters) is unavailable. Initially, unsuitable surface roughness, the friction between rolls and the strip and thermal conditions result in the rupturing of steel strips. Usually, cold rolling of several coils of thick steel strips, for example 0.3 -0.5 mm thickness, for the first rolling pass is necessary. This primary preparation reduces the work rolls life and produces unneeded coils. In this study, by experimental investigation, the effective parameters such as lubrication condition, surface roughness of work rolls and their improvement, the possibility of cold thin steel strip rolling is examined. Finally, several methods for improvement the cold rolling efficiency and decreasing the amount of strip rapture in the two stand reversing cold mill are presented.