The Study On Dynamic Setting Method Of Heavy Plate Mill Bending Force

Heavy plate is the main product of the steel industry and shape control is one of the key technologies of heavy plate mill. Hydraulic Bending Roll System is the most common and effective way to control shape. Therefore, researching the influence of bending force on the shape control has a very important significance to guarantee the proportion of steel crown and improve the level of shape control. In this paper, as the research object to a domestic4300mm heavy plate, the theory of elastic deformation of rolls was studied systematically in order to optimize shape. Based on influence function to establish rolls elastic deformation model, bending force pre-set control and compensation calculation method have been studied deeply. Applying the finite element software ANSYS Workbench to simulate the established bending force model, and the model correctness was verified by experiments finally. The main contents were shown as follows:(1) Elastic deformation theory of shape control theory rolls was studied. The elastic deformation of rolls model was constructed based on influence function method, combined with the elastic deformation of the beam theory from the perspective of the model adaptation. With the calculated high precision of the plate thickness distribution to analyze the influence of bending force on the crown ratio.(2) Based on the finite element software ANSYS Workbench actual size of roll system to model, influence function method for the calculation results were verified and corrected by the simulation results obtained to improve the accuracy of the bending force model setting.(3) Considering the convexity restrictions of heavy plate rolling process and the minimum bending force requirements, bending force preset detailed steps under the good flatness conditions were established based on the model of the two procedures model calculations. And the bending force optimal settings of the whole passes were solved by using influence function method.(4) Corresponding relationships between rolling force change and bending force change were established through the research on the shape trend of rolling force and bending force. Bending force dynamical setting compensation coefficient was calculated and the dynamic adjustment of bending force was achieved by the basic automation.(5) Bending force setting system structure was designed for the heavy plate rolling mill process features. Besides, bending force calculation process and the process of the second level models between data communication contents and triggering events were established to standard the communication logical order of the process inner-system. And the bending force setting system was developed by using Microsoft Visual C++6.0programming software.