Browsing by Author "Arbuz A."

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    COMPUTER MODELING AND INVESTIGATION OF THE DEFORMATION PROCESS IN CONVEX-CONCAVE AND TRAPEZOIDAL STRIKERS
    (2023-01-01) Volokitin A.; Naizabekov A.; Panin E.; Tolkushkin A.; Nurakhmetov D.; Yordanova R.; Volokitina I.; Arbuz A.
    The article presents the results of a comparative analysis of the deformation process in convex-concave and trapezoidal strikers using computer modeling by the finite element method in the Deform program. In both designs, two variants are considered - with an equal and unequal ratio of the protrusion to the depression. For comparative analysis, equivalent stresses and strains, energy - power parameters are considered. Also, on the basis of computer modeling, the analysis of the microstructure evolution during the deformation in convex - concave and trapezoidal strikers was carried out. In the course of computer modeling, some advantage of the design of convex - concave strikers in comparison with trapezoidal strikers was proved.
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    Evaluation of the effectiveness of the use of horizontal and vertical rolls in the ``rolling-pressing`` process on the basis of the stress-strain state studying
    (2017-03-01) Lezhnev S.; Naizabekov A.; Panin E.; Koinov T.; Mazur I.; Arbuz A.
    In this work was performed a comparative analysis of the efficiency of horizontal and vertical rolls in the ``rolling-pressing`` process. The comparison was performed based on the study of stress-strain state of both variants with the aid of computer simulation in the program DEFORM-3D based on the finite element method. For analysis of the stress state was used the Lode-Nadai coefficient, allowing you to determine which type of deformation is realized at a specific point - tension, compression or shear. For analysis of the strain state was used equivalent strain, which allows to estimate the common level of accumulated strain. In the comparative analysis of parameters of SSS was revealed that the use of vertical rolls at the exit from the matrix during ``rolling-pressing`` process, allows you to achieve a more favorable distribution of deformation along the entire length of the deformable workpiece.
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    Simulation of radial-shear rolling of austenitic stainless steel AISI-321
    (2019-01-01) Naizabekov A.; Lezhnev S.; Arbuz A.; Panin E.; Koinov T.
    This paper presents the results of modelling of a radial-shear rolling process of austenitic stainless steel AISI- 321. The simulation is performed by Simufact Forming Program Complex. The conditions of simulation refer to those of 14-40 radial-shear mill of Rudny Industrial Institute. The various parameters of the stress-strain state (the effective plastic strain, the effective stress, the mean normal stress and the Lode-Nadai coefficient) as well as the microstructure evolution with the rolling force are considered. It is revealed that the radial-shear rolling is an effective process for obtaining high quality round billets from stainless steels of the austenitic class.
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    Study of axial forces with the purpose to realize a combined process «helical rolling-pressing»
    (2015-01-01) Naizabekov A.; Talmazan V.; Arbuz A.; Koinov T.; Lezhnev S.
    The key factor for practical realization of the combined process «helical rolling-pressing» is the axial force of the helical rolling, which should provide a continuous pressing in the matrix after the rolls. For the measurement of the maximum axial rolling force, which is actually the reserve of friction forces, a special strain gauge has been made. The work was carried out at a three-roll helical rolling mill ``10-30`` for the case of hot rolling of steel bars with diameters of 16-25 mm at a reduction of 6 % of diameter and a temperature of 1000°C. The results shown are of 24 tests.