Cracking of the roller of the tension station of the loop accumulator of the tandem cold rolling mill 2000.

Abstract

In the event of self-oscillation of the roller of the tension station of the loop accumulator of the cold rolling mill, cracks appear on the outer surfaces of the roller during operation. Determining the causes of cracking and assessing the residual life of the roller of the tension station is an urgent task. A digital double of the tension station of the loop accumulator of the cold rolling mill has been developed in accordance with the classification of Michael Reeves and in accordance with the standard GOST R 57700.37-2021 “Computer models and modeling. Digital doubles of products”. The technological parameters and diagnostic data used, reflected and stored in an environment external to the industrial facility, represent a “digital shadow”. Databases of technological and vibration parameters of the mill and the roller of the tension station are combined by a graphical shell. A numerical 3-dimensional model of a tensioning station roller is constructed. The eigenforms and eigenfrequencies of the oscillations are determined. The lower eigenforms obtained by calculation are consistent with the vibration frequencies of the bearing supports of the tensioning roller stored in the digital footprint of the mill. At high frequencies, a mixed form of oscillations is observed (shell oscillations, and bending of the semi-axes) which also has an approximate match on the vibrograms of the digital footprint. Vibration acceleration and loading cycles of the bearing supports of the tension station are associated with the use of a virtual industrial experiment. The numerical 3- dimensional model of the tensioning station roller determines the real loads acting on the end surfaces of the roller when self-oscillations of the tensioning station occur. Information about the frequency and amplitude of vibrations allows you to calculate the number of loading cycles and estimate the residual resource before cracks occur on the end surfaces of the roller of the tension station.