Abstract
Limited by the deficiency of the finite element method (FEM) to deal with infinite domain problems, the traditional FEM rolling model is not suitable enough to study the effect of the complex internal stress of the incoming strip on hot rolling deformation. To solve this problem, the finite element and infinite element (FE-IE) coupling method is adopted, where the finite element is for the rolling area of the strip and the infinite element is for the elastic constraint of the strip end. Based on the improved rolls-strip coupling model, several internal stresses with typical distribution forms are applied to the strip by a programmed user subroutine, and the effect of the internal stress of the incoming strip on hot rolling deformation is evaluated. The results show that under the same average stress, the various distribution forms of internal stress have little effect on the total roll force, mainly because of the average effect. The uniform internal stress decreases the central thickness and quadratic crown of the strip. Under the symmetric stress and asymmetric stress, the thickness of each fiber along the strip width direction is closely related to the magnitude and distribution of the stress deviation (subtract the average stress from the longitudinal stress). Under the quadratic wave stress, the central thickness and quadratic crown vary almost linearly with the amplitude of the stress deviation. The efficiency coefficients obtained can be treated as a theoretical basis for the further development of an accurate prediction model of hot rolling.
Highlights
Strip steel is an important industrial raw material
The internal stress, which may be imposed stress or residual stress in the incoming strip, is related to the looper tension, and dependent on the additional non-uniform stress caused only related to the looper tension, and dependent on the additional non-uniform stress caused by uneven reduction or thermal expansion before the current rolling
(2) Due to the average effect, the various distribution forms of the internal stress only change the distribution of the rolling force, but have little effect on the total roll force
Summary
Strip steel is an important industrial raw material. With the development of modern industry, more and more attention has been paid to the accurate sizing of the strip [1,2,3]. It is necessary to establish ansimulation effective rolling model to of study internal stress of the incoming strip on hot rolling deformation. In the traditional finite element rolling model, the strip is always defined as a short one for low computational cost. This is enough for the simulation of the rolling deformation of the strip without computational cost. The internal stress of the strip will be released at the beginning of rolling due to the free extension extension of the end metal To avoid this problem, extending the strip is one available method. It is feasible to introduce the infinite element into the finite element rolling model to simulate the hot rolling deformation of nearly infinite-length strip with internal stress. The new model proposed is able to make up for the deficiency of the traditional finite element model and lay a theoretical foundation for further development of an accurate prediction model in the hot rolling process
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