Title of the article

APPLICATION OF PROMISING SPARINGLY ALLOYED STEELS FOR GEARS OF MOBILE MACHINES

Authors

RUDENKO Sergei P., Ph. D. in Eng., Leading Researcher, Joint Institute of Mechanical Engineering of the NAS of Belarus, Minsk, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

VALKO Aleksandr L., Senior Researcher, Joint Institute of Mechanical Engineering of the NAS of Belarus, Minsk, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

SANDOMIRSKII Sergei G., D. Sc. in Eng., Head of the Laboratory of Metallurgy in Mechanical Engineering, Joint Institute of Mechanical Engineering of the NAS of Belarus, Minsk, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

In the section TECHNOLOGICAL MECHANICS
Year 2019 Issue 4 Pages 61–69
Type of article RAR Index UDK 669.15 Index BBK  
Abstract Examples of the main types of destruction of highly loaded gears in transmissions of automotive and tractor vehicles are given. Their causes are analyzed. It is established that the criterion for the performance of highly stressed gears of transmissions subjected to hardening of chemical heat treatment is a deep contact fatigue of the active surfaces of the teeth. It is shown that to increase the resistance of contact fatigue of gears in transmissions of mobile machines, it is important to ensure high microhardness in the zone of maximum deep contact stresses. The results of the use of traditional and sparingly alloyed steels for highly loaded transmission gears are compared. The advantages of using sparingly alloyed steels are shown. It has been established that the tendency to deform of traditional high alloy steel during heat treatment is 2–4 times higher than that of sparingly alloyed steels. The lifetime of gears made of sparingly alloyed steels is increased by at least 2 times. These steels are recommended for the manufacture of highly stressed gears.
Keywords

transmission gears, sparingly alloyed steels, chemical heat treatment, cemented layers, mechanical characteristics, deformation, destruction, resource

   
Bibliography
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Title of the article

STRUCTURAL DESIGN AND TAILORING OF COMPOSITES TO OBTAIN NEAR ZERO COEFFICIENT OF LINEAR THERMAL EXPANSION

Authors

SHIL’KO Sergey V., Ph. D. in Eng., Assoc. Prof., Head of the Laboratory, V.A. Belyi Metal-Polymer Research Institute of the NAS of Belarus, Gomel, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

PETROKOVETS Ekaterina M., Researcher, V.A. Belyi Metal-Polymer Research Institute of the NAS of Belarus, Gomel, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

ZHANG Qiang, D. Sc. in Eng., Prof., Professor, Harbin Institute of Technology, Harbin, People’s Republic of China, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

In the section TECHNOLOGICAL MECHANICS
Year 2019 Issue 4 Pages 55–60
Type of article RAR Index UDK 536.413:539.3:678.01 Index BBK  
Abstract The paper discusses the realization of high dimensional stability of products, including minimization of thermal strains by the use of additives having negative coefficient of linear thermal expansion, as well as auxetics having negative Poisson’s ratio. Mechanisms of change of thermal stress state of the porous, dispersion-reinforced and layered materials are established during heating and cooling, depending on elasticity moduli, the size of inclusions, a parity of rigidity of the matrix and the filler as well as boundary conditions. The results of structural design make it possible to improve dimensional stability and reduce residual stresses of microelectronics elements, precise equipment for aerospace engineering and measuring instruments.
Keywords

measuring instrument, microelectronics elements, functional materials, aluminum alloys, auxetics, zirconium tungstate, thermal expansion, residual stresses, finite element analysis

   
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Title of the article

LOAD OF CUTTING UNITS DRIVES OF MINING EQUIPMENT. PART 2. TECHNIQUE OF COMPLEX MONITORING OF LOADING PARAMETERS OF THE DRIVE GEAR OF THE CUTTING UNIT

Authors

ROMANOVICH Alexander S., Director General, UPE “Niva”, Soligorsk District, Republic of Belarus

KANAPLIANIK Ivan A., Ph. D. in Eng., Deputy Director General for Technical Policy and Innovations, UPE “Niva”, Soligorsk District, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

In the section MECHANICAL ENGINEERING COMPONENTS
Year 2019 Issue 4 Pages 40–47
Type of article RAR Index UDK 622.6 Index BBK  
Abstract

The article presents the results of studies that showed that when monitoring the loading of the drive of the cutting body of a combine that combines vibrodiagnostics with the traditional assessment of the parameters of its functioning, its information content can be significantly increased, and the assessment of not only the state of the cutting bodies, but the actual resistance of the potash salt layer to destruction, which allows for the selection of the most rational, in terms of ensuring the highest performance, geometry and properties of the cutters, as well as a technically and economically reasonable choice of the range of variation of the speed of the combine and forecasting its performance and the cutting body associated with this technical condition. A comprehensive monitoring methodology has been developed for the electromechanical actuator of the cutting body, taking into account the influence on the loading parameters of the cutting condition of the cutting organ and the resistance of potash ore to cutting, the implementation of which makes it possible to quickly determine the causes of increased load related to either an increase in resistance of solid to cutting or breakage of the cutters for the rapid elimination of the latter.

Keywords

vibrations, gear, monitoring, loading, modes of operation, drive

   
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Title of the article

LOAD OF CUTTING UNITS DRIVES OF MINING EQUIPMENT. PART 2. TECHNIQUE OF COMPLEX MONITORING OF LOADING PARAMETERS OF THE DRIVE GEAR OF THE CUTTING UNIT

Authors

PANTELEENKO Fedor I., Corresponding Member of the NAS of Belarus, D. Sc. in Eng., Prof., Head of the Department “Powder metallurgy, Welding and Materials Technology”, Belarusian national technical university, Minsk, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

BELOTSERKOVSKY Marat A., D. Sc. in Eng., Assoc. Prof., Head of the Laboratory of Gas-Thermal Methods of Machine Components Hardening, Joint Institute of Mechanical Engineering of the NAS of Belarus, Minsk, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

KARPETS Maksim N., Ph. D. Student, Belarusian national technical university, Minsk, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

SOSNOVSKY Aleksey V., Ph. D. in Eng., Leading Researcher, Joint Institute of Mechanical Engineering of the NAS of Belarus, Minsk, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

In the section TECHNOLOGICAL MECHANICS
Year 2019 Issue 4 Pages 48–54
Type of article RAR Index UDK 621.793 Index BBK  
Abstract A comparative analysis of the physical and mechanical properties of coatings obtained using electric arc spraying and hypersonic metallization methods is made. Comparisons were carried out when applying the coatings of wire Sv-08G2S. It is shown that the coatings obtained by hypersonic metallization have 2–5 times higher density compared to coatings obtained by electric arc spraying, as well as superior adhesion strength by 1.5–2 times, microhardness by 1.2–1.5 times, oxidation resistance by 1.5–1.7 times. It is established that the use of hypersonic metallization for the recovery and hardening of machine parts with the use of wire Sv-08G2S is more preferable than the use of electric arc spraying.
Keywords

hypersonic metallization, electric arc spraying, metal coatings, physical and mechanical properties

   
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Title of the article

ISOTHERMAL LOCAL LOADING OF AN ELASTOPLASTIC THREE-LAYER PLATE

Authors

PLESKACHEVSKY Yuriy M., Corresponding Member of the NAS of Belarus, D. Sc. in Eng., Prof., Head of the Department “Micro and Nanotechnology”, Belarusian National Technical University, Minsk, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

STAROVOITOV Eduard I., D. Sc. in Phys. and Math., Prof., Head of the Department “Structural Mechanics”, Belarusian State University of Transport, Gomel, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

LEONENKO Denis V., D. Sc. in Phys. and Math., Assoc. Prof., Professor of the Department “Structural Mechanics”, Belarusian State University of Transport, Gomel, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

In the section DYNAMICS, DURABILITY OF VEHICLES AND STRUCTURES
Year 2019 Issue 4 Pages 32–39
Type of article RAR Index UDK 539.3 Index BBK  
Abstract

The effect of circular, annular and linear uniformly distributed axisymmetric loads on a round three-layer plate with asymmetric thickness is considered. The analytical type of loads is described using the Heaviside function. The materials of the bearing layers of the plate are elastoplastic, the filler is physically nonlinear. For the asymmetric in thickness three-layer plate we have accepted the kinematic hypothesis of a broken normal. In the thin external layers the Kirchhoff’s hypotheses are accepted. The filler is no compressible through thickness. It’s normal subject to the hypothesis Timoshenko. The work of arising shear stresses is taken into account. The formulation of a boundary value problem is given. The equilibrium equations are obtained by the Lagrange variational method. Boundary conditions on the plate contour are formulated. The solution to the boundary problem is reduced to finding the three required functions: deflection, shear and radial displacements of the middle plane of the filler. For these functions, an inhomogeneous system of ordinary nonlinear differential equations is obtained. Its solution was carried out by the Ilyushin elastic solution method. It is shown that the fifth approximation can be taken as the desired solution, since its difference from the previous one does not exceed 1 %. Iterative analytical solutions are obtained in Bessel functions. Their parametric analysis is carried out. Numerical results are obtained for a plate which layers are recruited from D16T–fluoroplast-4–D16T materials which mechanical characteristics, including nonlinearity functions, were obtained earlier. The boundary conditions correspond to the hinge support of the plate contour. The influence of the physical nonlinearity of the layer materials on the displacements in the plate is investigated. It is shown that the increase in calculated displacements during elastoplastic deformation in the plate is up to 20 %.

Keywords

three-layer circular plate, circular and ring loads, elasticity, plasticity

   
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