Method for calculating elastic deformation of roll syste of plate-strip rolling mill

The invention provides a method for calculating the elastic deformation of a roll system of a plate and strip rolling mill, which comprises the following steps of: 1, segmenting a working roll, a middle roll and a supporting roll, and discretizing corresponding variables; 2, uniformly mapping or superposing preset convexity to each discrete point, calculating initial inter-roller contact force distribution in the step 3, flattening the center, and inclining a flattening area; 4, performing inner-layer iteration; step 5, outputting flattening and inter-roller contact force if the pressing forceand the inter-roller contact force are balanced; 6, calculating deflection of each discrete point; calculating deflection of each discrete point based on a bending moment direct numerical value; 7, calculating an inter-roller flattening increment dKi; 8, judging whether the flattening increment is smaller than a threshold value or not; and 9, outputting flattening distribution between rollers, contact force between the rollers and roller gap shape data. By applying the embodiment of the invention, the convergence of calculation is improved, the calculation time consumption is reduced, and thecalculation amount is reduced.