Taper roll contours are widely applied in the single stand universal crown mill (UCM) to control the edge-drop of silicon steel, but bilateral symmetrical quarter buckles always happen in the last pass. It shows that the control on the strip profile and flatness has strong coupling nature. In this paper, the strip profile and the rolling parameters are obtained by simulations, and influences of the rolling parameters on the strip profile and flatness are revealed. The authors put forward a cantilever end model of the work roll influenced by the bending force, and analyze the rule of the influence the work roll taper curve on the additional pressure on the strip. Moreover, the rolling process characteristics of the UCM reversible rolling are expounded. One of the reasons for the coupling nature of the control on the strip profile and flatness is that, the roll taper curve increases the concentration and peak value of the additional pressure on the strip, and another is that the roll taper curve limits the lateral displacement of metal, increasing the longitudinal prolongation of metal. The optimization principle of the roll contour is determined based on the above influence mechanism.
In order to evaluate the transverse thickness difference of cold-rolled strips according to the information of hot-rolled strips and scientifically guide the setting of the indicators of the hot-rolled silicon strip, the influence model about the relation of the transverse thickness difference of cold-rolled strip to the profile indicators of hot-rolled strip is established in this paper based on simulation results. The transverse thickness difference of cold-rolled strip predicted based on the influence model have strong correspondences to the measured data. Based on the influence model and the statistical analysis of the measured data, the control criterion of the profile indicators of hot-rolled silicon steel according to the requirements for the transverse thickness difference of cold-rolled strip are finally recommended. The simulation results show that the transverse thickness difference of cold-rolled strip is quadratic nonlinearly related to the wedge and crown of hot-rolled strip. The influence model and statistical data analysis indicate that reducing the edge-drop of hot-rolled strip is beneficial to restrain the transverse thickness difference of cold-rolled strip.
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 rolled silicon steel.
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