Large concave roll technology for hot rolled silicon steel

It has a strict demand for the transverse thickness difference of silicon steel. To reduce the transverse thickness difference of the cold rolled strip, it must reduce the crown and the wedge of the hot rolled strip. 7-Stands continuously variable crown (CVC) hot rolling mills are conventionally applied to roll silicon steel. However, the CVC rolling mills have many defects to roll silicon steel as a result of the strict demands for the crown and the wedge and the characteristics of the CVC rolling mill. The large concave roll (LCR) technology was puts forward to solve that problem. The LCR technology includes the design of the roll contour and the roll free shifting strategies. The results of simulations and experiments show that the LCR technology can not only ensure the crown target of silicon steel, but also enlarge the coil quantity in a rolling schedule and improve the hot rolled strip edge-drop in the late of rolling schedule. This technology provides guidance for the crown control of the hot rolle...