ROOT CAUSES OF MISROLL IN REROLLING MILLS

Steel has been known to humanity for 4,000 years. The level of per capita consumption of steel is treated as one of the most important indicators of socioeconomic development and living standards of the people in a country. Steel rerolling mills, also called reduction mills, are widely distributed across the world. The major concerns in the steel rerolling mill are misroll and cobble, which adversely affect most of the technoeconomic parameters, including the mill utilization, material yield, mill productivity, overall equipment effectiveness, overall line efficiency, and specific heat consumption of the reheating furnace. This paper discusses the major issues that lead to misroll and cobble in the rerolling mills, and these issues were identified via a shop floor analysis and breakdown records at an iron and steel rerolling mill. After the identification of the root causes of misroll, solutions are suggested.