The Research On Mathematical Model And Key Technology Of Fifteen_roller Combination Plate Roller Levelling

The plate leveller is important equipment of plate mill, and is key to productivity,flatness,residual stress of plate. In recent years, the customers have increasingly demands for the flatness tolerance of plate. Particularly, after TMCP technology has been widely used, plate leveller with high strength and stiffness, multi-function and advanced automation are required due to the fact that levelling temperature is lowered and yield strength of materials is increased. There is gap in perfect levelling model and automation between domestic and international.Aimed at plate levelling model and the key relative technology, the paper developed analytical model of plate levelling process, Fifteen_roller combination leveller, the more key relative technology, by geometricanalysis, FEM simulating and experiment. Main content of the paper are introduced below:1) The 15-roll combination leveler is designed for high strength plate leveling. Its specific roll structure could expand the thickness range of leveling plate steel. When leveling medium plate with thin scale, such 15-roll combination leveler adopted parallel leveling and expanding leveling technologies to improve the leveling precision of plate steel, as well as to expand the capacity range of material strength on leveller. The result is obtain the the parallel leveling is feasible by optimization of rollers parameter. Finally, the rollers parameter data is give that the the parallel leveling is feasible.2) The normal operation is the key problem of combination leveler. The bite stage of plate is kernel by geometric analysis and the paper give the stabilization condition of the bite of plate in leveling. Because there is transition roller in combination leveler, the relative bite stage of plate have stabilization problem. The optimization of rollers parameter is gived to resolve the question.3) The traditional calculation of levelling process was based on analysis of static beam. And it do not meet to need of advanced automation leveler. Taking account of different effects on work hardening and neutral layer displacement, the calculation model of levelling process is developed.by the calculation mode, the technology of Deficient deformation and 15-roll combination leveler is bring on. Due to limits of leveling machine's ability, it is difficulty that leveling heavy plate of high deformation resistance. The Deficient deformation Leveling model in heavy plate may amend profile shape in effect. In the model it is adopted that counter bend curvature Cw is less than rebound limit curvature Ct, and the residual curvature's distribution Cc is homology and is less than original curvature C0.The model reduce power of leveling and extend range of deformation resistance byl/4～1/3. The parallel leveling scheme is different to tradition model in the 15-roll combination leveller. The small roll system of the combination leveller makes work piece produce the same bending deformation with larger bending curvature, making the range of residual curvature rapidly decrease The large roll system of the combination leveler makes work piece produce the same bending deformation with smaller bending curvature and continuous small deformation, and the residual curvature could be gradually decreased.4) Evolvement of plate wave in level are studied in this paper using both analytic geometry and FEM.The analytic geometry and simulated results show that the relative accurate results could be obtained between analytic geometry and simulated results. It is possible that the roll leveler maybe smooth wave of plate and enhance the flatness of plate. Tt is occur that the offset of stress and strain layer in the level init. The effect of wave level is exist in the first and second level unit, and the flatness of plate is increased in sequel level unit. The result show that the increasing the entance intermesh is a means of increasing flatness of plate.5)The relate key technology is pledge to the flatness tolerance of plate and Productivity. The process automation model system, screw down system and rolls' deformation are investigated, the result indicate the self-learning deformation resistance mode is applicable to calculation of levelling process, the servo screw down system and it's DOF model is developed to suiting to levelling process, the top rolls and cabinet's compress rigidity is 4.9 X 104N/mm, bend rigidity is 6.92 X 104N/mm.