NUST MISIS, Moscow, Russia

M. M. Skripalenko, Cand. Eng., Associate Prof., e-mail: mms@misis.ru
B. A. Romantsev, Dr. Eng., Prof., e-mail: boralr@yandex.ru
M. N. Skripalenko, Cand. Eng., Associate Prof., Scientific Project Expert, e-mail: tfsmn@yandex.ru
V. A. Vorotnikov, Leading Specialist in Technical Equipment, e-mail: vrtnkov@gmail.com

Computer simulation of stainless steel billet three-high screw rolling was carried out at 6, 12, 18 and 24 degrees rolls feed angle. Computer simulation results show that rolls feed angle increasing makes stress-strain, thermal and kinematic condition of the billet more uniform: accumulated strain standard deviation decreases 4 times; range of mean stress values along the billet radius decreases 2,3 times; billet temperature range decreases from 134 °C to 110 °C with the rolls feed angle increasing; total velocity range along billet radius when leaving deformation zone decreases 1,3 times. Considering accumulated strain as a measure of shear strain, it was established how rolls feed angle increasing affects value and uniformity of distribution of shear strain throughout billet volume: rolls feed angle increasing decreases shear strain and more uniform distribution of shear strain through billet volume. Using estimation of mean stress along billet radius on the stationary stage, it was detected that possible reason for grain elongation in the central area of the billet is predominance of tensile stresses in this area. It is shown how changing of accumulated strain, temperature and total velocity can form fine grain surface, transient and coarse grain central areas dimensions in the billet. Computer simulation results showed that total velocity of inner layers of the billet while rolling with all selected rolls feed angle values increases whereas total velocity of outer layers – decreases.

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