INVESTIGATION OF MICROSTRUCTURE AND ENERGY-POWER PARAMETERS IN THE SIMULATION OF A NEW TECHNOLOGY FOR THE PRODUCTION OF HARDENED SCREW FITTINGS

The paper presents the results of a study of the microstructure and energy-power parameters of a new technology for obtaining hardened screw fittings by finite element modeling in the Deform program. To simulate the microstructure evolution, the Cellular Automata method was chosen, which allows to estimate the size and shape of grains. The analysis of the microstructure evolution on the surface and in the axial zone of the rod at various stages of deformation showed that at large values of compression, the deformation in the rolls has the main influence on the processing of the structure, at small values - in the matrix. With an initial grain size of 60 microns in one deformation cycle, the final size is 2-3 microns on the surface of the rod. With a decrease in compression in the rolls, the processing of the axial zone is significantly reduced. At the same time, in all the models considered, the gradient distribution of grain size is preserved along the cross-section of the rod. The analysis of axial forces in the matrix showed that the forcevalues for all models are approximately at the same level of 5 - 7 kN.