Analysis of the Stress-Strain State of Metal during Rolling of Blanks in Deformation Zones of Different Scale Factors
摘要
The stress state of metal during longitudinal rolling of 360 × 360 mm billets with a reduction of ε = 20% in deformation zones of different scale factors was created by analytical modeling using three pairs of rolls of the following diameters: 1200, 1000 and 800 mm. The scale factors of deformation zones for this series of rolls had the following values: m1 = 0.114, m2 = 0.165 and m3 = 0.258, where m = Sw/Sr, Sw and Sr are the cross-sectional areas of the billet and roll. Using the known trajectory of shear displacement of metal during rolling, the velocity field was determined, on the basis of which, using continuum mechanics, analytical relationships were established, which made it possible to analyze the stress state of metal during billet deformation for a series of roll sizes. According to the results of the study, the highest level of deformation impact on the workpiece was achieved by rolls with a diameter of 800 mm. These rolls, compared to other rolls, form a deformation center of a larger scale factor equal to m3 = 0.258, which can be considered as an indicator of the optimality of the dimensional relationships between the roll and the workpiece, at which the most effective deformation processing of the original cast macrostructure of the metal is achieved.