Abstract
Based on unsteady airflow excitation and elastic thin strip vibration theory, a SI-FLAT flatness meter was taken as the research object, and an amplitude–residual stress simulation analysis model of the cold rolling strip under aerodynamic loads was established by using ANSYS Workbench. First, the influences of fluid–structure interaction on the strip amplitude distribution and the flatness calculation deviation were analyzed. It was found that the analysis with fluid–structure interaction matched the actual measurement of the flatness meter better. Then, the influences of different aerodynamic loads and tensions on the strip midpoint amplitude and the flatness calculation deviation were analyzed. It was found that when alternating aerodynamic loads increased, the strip amplitude increased in the form of a quadratic polynomial. However, when the tensions decreased, the strip amplitude decreased exponentially. The strip dimensions also influenced the amplitude of vibration: The wider and thinner the strip, the larger the amplitude. Finally, the influences of different flatness defects on the strip amplitude distribution and the flatness calculation deviation were analyzed. The deviation was serious on the strip edge, and the fluctuation characteristics of the deviation were opposite to those of the initial flatness defects.
Highlights
Strip flatness, which is the core of flatness control in cold rolling, is one of the most important quality indexes of the cold rolling strip
Based on the theory of unsteady airflow and the elastic thin plate, in order to obtain a more accurate strip amplitude distribution of an elastic thin plate excited by unsteady airflow and to further calculate or correct flatness measurement deviations, a finite element simulation model of residual stress–amplitude of the cold rolling strip under aerodynamic loads was established to analyze the influences of different parameters on the strip midpoint amplitude, the amplitude distribution, and the flatness measurement deviation
The deviation, which is the difference between the flatness set by the finite element model and the flatness calculated from the amplitude calculation results by the finite element model, is defined as the flatness calculation deviation, and the calculation steps are shown as follows: (1) An uneven temperature was imposed on the strip, and the internal tensile stress of the strip was calculated by the thermal stress module in ANSYS
Summary
Strip flatness, which is the core of flatness control in cold rolling, is one of the most important quality indexes of the cold rolling strip. A strip vibration model was established by ANSYS, and the flatness calculation deviations under different factors were analyzed. If the influences of load, tension, and flatness defects on the amplitude distribution are unclear, the flatness transformation model and the target curve cannot be corrected scientifically, and the flatness measurement deviations surely occur. Based on the theory of unsteady airflow and the elastic thin plate, in order to obtain a more accurate strip amplitude distribution of an elastic thin plate excited by unsteady airflow and to further calculate or correct flatness measurement deviations, a finite element simulation model of residual stress–amplitude of the cold rolling strip under aerodynamic loads was established to analyze the influences of different parameters on the strip midpoint amplitude, the amplitude distribution, and the flatness measurement deviation. Is the fluid–structure interaction vibration mechanism of the elastic thin strip further revealed, but more importantly, the study can help staff understand and correct the target curve in the field so as to provide a theoretical basis for the effective and accurate noncontact detection of internal stress in the thin strip
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