Numerical Simulation Of The Shape For304Austenitic Stainless Steel Strip

With the improvement of modern production technology, cold rolled stainless steelplate is used more and more widely, the requirements of the user for the quality of coldrolled stainless steel strip in flatness is also more and more high. Therefore, the flatnessproblem of the cold rolled stainless steel strip in the process of cold rolling become the keyand difficult point researched extensively.This paper studied effect on the strip flatness by the tension and support roll bendingforce in stainless steel strip cold rolling process, simulated the single channel cold rollingprocess of5mm thick304austenitic stainless steel plate using the finite element softwareANSYS/LS-DYNA, the elastic-plastic finite element method, combing with productiondata of a steel plant, extracted and analyzed the data of rolling reduction stress and strainafter changing the tension and bending support roll bending force, analyzed the influenceon the flatness and reduction of rolled pieces by the two factors.Research results show the influence on the rolling reduction is different betweenbefore and after tension, increasing tension can increase deformation of rolled piece inthickness, effect is more apparent when increasing the after-tension. Fixed tensiondifference between before-tension and after-tension, increased the before-tension and after-tension at the same time, the rolling reduction changed the same as increasing before-tension or after-tension singly.Increase tension before or after tension can improve plate shape of rolled piece.Before when the tension after9MPa unchanged, increase tension, rolled piece in themiddle of the tensile stress is reduced, and the tensile stress in the edge of plateau, andfluctuation of strain value is reduced, the rolled piece of strip shape is improved. Whenkeep tension before21MPa,5MPa for tension, compression of rolling work piece edgestress, tensile stress, the central cause of rolled piece side extension is greater than themiddle, in the rolling process were prone to edge wave flatness defects. Increased after tension to9MPa, the rolled pieces side by compressive stress to tensile stress, tensile stressof central decreases, and the rolled piece edge stress tends to average, and central sufferedwhen tension after the increase, the oscillation of the rolled piece strain value decreases,and help to improve the plate shape of rolled pieces, but to improve the effect of stripshape is better than before the increase tension.Applying the force of bending roll is a common method for improving strip shape.Increasing the positive roll bending force which load on the back-up roll can augment therolled piece’s depress, but the effect is not obvious. When the positive roll bending forcewhich load on the back-up roll increase from0KN to200KN, the middle part of the rolledpiece where suffer the pressure stress decrease, the roll piece’s side suffer tensile stress, themaximum tensile stress appear on0.07m away from the edge of rolled pieces, the strainvalue’s wave of rolled piece minish, rolled piece of strip shape is improved.In this article, through the continuous development of finite element theory and thejuicing, builds up the bridge of communication for the reasonable rolling technology toprovide effective reference.