AUTOMATED DESIGN OF ROLLING MODES IN EDGER ROLLS

Abstract

Rolling in edger rolls makes it possible to produce rolled plates with the correct cross-sectional shape along the side edges, which reduces the side cut and increases the yield of usable products. The developed 2D model based on the finite element method and the regression model based on its implementation results allow us to determine the energy and power parameters of the process. The regression models were built on the basis of the obtained dependences of the stress state coefficient and the shoulder coefficient on the specific ratio of the deformation center 1length to the average thickness of the slab. However, the conical shape of the work roll makes these results suitable only for design work on the creation of equipment. In this case, an analysis based on 3D models is appropriate. The analysis of the stress-strain state during rolling in edger rolls showed uneven deformation along the thickness of the sheet. This raises the question of the deformation strain required to solve a two-dimensional model. The average value of the deformation strain does not give a realistic picture in this case. However, this model also has a drawback, which is associated with the assumption of a rectangular workpiece shape, which is not true in a multi-pass scheme. It is also advisable to create models that take into account the rolling of the sheet in horizontal rolls before and after rolling in edger rolls. The concavity of the edges after rolling in horizontal stands can reach a significant value, and the presence of a dogbone defect also affects the side edge after rolling in horizontal rolls. As an example, we analysed the rolling of a 300 mm thick sheet to 95 mm and 1000 mm wide. The edge concavity after the 5th pass was 17 mm, the dogbone height after rolling in a vertical stand was 18.5 mm, and the edge concavity after the 13th pass was 0.73 mm. In summary, the two-dimensional model allows us to quickly find the deformation modes, the three-dimensional model provides an understanding of the stress-strain state, and the integrated solution with the analysis of rolling in horizontal rolls makes it possible to determine the rational rolling modes and determine the geometric shape of the plate after rolling.