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The article presents the use of OEE metric to evaluate the effectiveness of the rolling mill line used for production of medium steel sections. Achieving maximum effectiveness of machinery and equipment by shortening the production cycle, resulting from continuous and uninterrupted flow of material results from Lean management, which is the result of continuous evolution and development of the concept of production management in industrial enterprises. More and more companies come to the conclusion that their success on the market decides the stable operation of machines and equipment used in the production process. One of the measures used to assess the level of utilization of owned machinery is OEE, the use of which allows to improve the productivity and effectiveness of the manufacturing process. The article presents the results of effectiveness evaluation of the rolling mill line used for production of medium steel sections by using OEE metric in a period of one year. Classification and quantification the reasons for standstills the rolling mill line by using the Pareto-Lorenz diagram were conducted. They have been identified and grouped root causes of rolling line stops by using the Ishikawa diagram. The article concludes with proposals to improve the effectiveness of maintenance of analyzed rolling mill lines.Keywords: Rolling mill line, effectiveness, OEE, Pareto-Lorenz diagram, Ishikawa diagram
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