EUROPEAN STEEL TECHNOLOGY AND APPLICATION DAYS 2017 - ESTAD 2017

The increasing demand of ever higher hardness and thinner steel, for example “advanced high strength steel” in the automotive industry, “tin plate” and “electrical (silicon) steel”, has accelerated in recent years. Particularly in the cold rolling field, harder- and thinner-strip rolling techniques have become urgent requirements which must be dealt with. The HYPER UC-MILL, which was newly developed for rolling harder- and thinner-strips with a higher accuracy, provides a high degree of strip quality by the use of smaller work roll diameter driven by work roll drive system using high-stiffness special spindles developed by Primetals Technologies. HYPER UC-MILL is the most advanced 6-High UCM (Universal Crown control Mill) which has optimal combination of work roll diameter, intermediate roll diameter and back up roll diameter in consideration of strip shape control ability and Hertz stress between rolls. As a result, HYPER UC-MILL has achieved 20-40% smaller work rolls compared with conventional UCMs’ under the work roll drive system. One of key-technologies that realized HYPER UC-MILL is high-performance work roll drive system consisting of special gear reducer and special spindles. To drive smaller work roll, gear reducers and spindles have designed to keep sufficiently rigidity and stability under the condition of high revolution. In this paper, Primetals Technologies will highlight the basic configuration, performance and supply references of HYPER UC-MILL in the tandem mill and reversing mill.