2_2020_sen_6

Title of the article

TO THE ISSUE OF THE FORMATION OF THE SURFACE TOPOGRAPHY DURING DIAMOND SMOOTHING
Authors

DOMASEVICH Vitaliy V., Design Engineer of the Bureau of Steel Production, Management of Design and Reconstruction, OJSC “BSW — Management Company of “BMC” Holding”, Zhlobin, 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.

KULGEYKO Mihail P., Ph. D. in Eng., Assoc. Prof., Associate Professor of the Department “Graphics”, 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 TECHNOLOGICAL MECHANICS
Year 2020 Issue 2 Pages 55–62
Type of article RAR Index UDK 621.787 Index BBK  
Abstract The article considers the physical model of the deformation interaction of the tool with the surface being treated in the process of surface-plastic deformation by diamond smoothing. A step-by-step diagram of the formation relief of the surface of the part during diamond smoothing with elastic and rigid fastening of the tool is presented. Given the general stationarity of the smoothing process under steady-state conditions, two unsteady periods are distinguished, characterized by instability of the surface formation conditions. The reasons and conditions for the unevenness of the process are illustrated by the surface deformation schemes for elastic and rigid fastening of the diamond tip. The sequence of stages of the formation of the surface layer in the initial period of the unsteady process is shown, when the tool comes into contact with the processed surface, and in the final unsteady period, when the tool leaves the contact interaction with the workpiece. At the same time, features are noted in the deformation pattern of the transitional periods of treatment with an elastic and rigid tool. The instability of the parameters of the contact interaction of the tool and the part in the unsteady periods of diamond smoothing causes the probability of the formation of defective areas on the treated surface. Expressions are given for determining the relief parameters of transitional sections of a smoothed surface and an estimate is given for the length of the transitional zone at the tool input in contact with the part and at the output from the contact, depending on the hardness of the processed material. The probable length of the transition sections, characterized by a deviation of the diametrical dimensions and surface shape, should be taken into account when designing the functional elements of the part and the technological process of finishing and hardening smoothing.
Keywords

diamond smoothing, superficial-plastic deformation, unsteadiness, model, deformation
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Bibliography
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2_2020_sen_5

Title of the article

TECHNOLOGICAL INDICATORS OF THE OPERATION OF CUTTING BLANKS FROM SHEET MATERIAL WITH A WIRE TOOL WITH A MODIFIED SURFACE BY ELECTROEROSION METHOD
Authors

KISELEV Mikhail G., D. Sc. in Eng., Prof., Head of the Department “Engineering and Manufacture of Devices”, 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.

MOSKALENKO Andrei V., Chief Engineer, Planar JSC, 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.

BOGDAN Pavel S., Ph. D. in Eng., Assistant, 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.

MONICH Sergey G., Ph. D. in Eng., Senior Lecturer, 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.

ANSCHITC Alexandr A., Student, Belarusian National Technical University, Minsk, Republic of Belarus
In the section TECHNOLOGICAL MECHANICS
Year 2020 Issue 2 Pages 46–54
Type of article RAR Index UDK 621.792.4 Index BBK  
Abstract The article is devoted to the experimental evaluation of the effect of EDM modifying the original smooth surface of the wire tool on its technological parameters when cutting different sheet materials, in particular, on cutting ability, surface quality of cut and quality of cut complex contours with sharp change of direction. It is shown that as a result of modifying the surface of the wire, single holes are formed on it that do not overlap each other, having metal flows on the edges that go beyond its original contour, which give it cutting ability. It was found that with an increase in the modification process, the energy of the electric discharge and the number of holes formed on the surface of the wire, its cutting capacity increases. It was established that when using the test wire tool, a clearly defined waviness is formed on the cutting surface, the appearance of which is due to the low rigidity of the tool, as well as the implementation of the process of destruction of the material both during its working and at idle. It is shown that the use of a wire tool with a modified surface makes it possible to ensure high quality and accuracy of cutting out of sheet materials with complex contour, characterized by a sharp change in the direction of its elements.
Keywords

wire tool, electroerosive surface modification, sheet material cutting, cutting capacity, cutting surface quality, complex contour
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Bibliography
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  8. Kiselev M.G., Drozdov A.V., Moskalenko A.V., Bogdan P.S. Vliyanie rezhimov elektrokontaktnoy obrabotki poverkhnosti provolochnogo instrumenta na ee rezhushchuyu sposobnost, iznosostoykost i prochnost na razryv [The effect of conditions of electrocontact treatment of the surface of a wire tool on its cutting ability, wear resistance and tensile strength]. Vestnik Belorussko-Rossiyskogo universiteta [Bulletin of the Belarusian-Russian University], 2013, vol. 39, no. 2, pp. 55–62.
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2_2020_sen_3

Title of the article

FATIGUE DAMAGE TO PRODUCTS DURING TESTING BY THE METHOD OF THE SWEEP FREQUENCY
Authors

SURIN Vitaliy M., D. Sc. in Eng., Prof., Professor of the Department “Engineering Graphics”, Belarusian State University of Informatics and Radioelectronics, 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 DYNAMICS, DURABILITY OF VEHICLES AND STRUCTURES
Year 2020 Issue 2 Pages 30–36
Type of article RAR Index UDK 620.178.311 Index BBK  
Abstract A method for assessing fatigue damage during vibration testing of electronic products by the sweep frequency method is considered, which is the main method when testing for the effects of sinusoidal vibration and consists in smooth frequency changing in a given range from lower to upper and vice versa, so that the resonances of the elements of the tested product are sequentially excited at a constant set exposure level. To assess the damage, the power equation of the fatigue curve has been used. The probability of the appearance of response amplitudes at a certain frequency was replaced by the probability of excitation being at this frequency. The use of frequency range intervals normalized with respect to the natural frequency f0 made it possible to exclude the influence of the scatter of the values f0 of the product elements when comparing the results. A quantitative assessment of damage in the preresonance, resonance and extraresonance frequency range intervals is proposed for the recommended values of mechanical quality factor and the slope of the fatigue curve in double logarithmic coordinates for the following frequency variation dependencies that ensure constancy of: the transit time of the resonance band of all elements of the product; the rate of change of frequency over the entire range; the number of oscillations of all elements of the product in the resonance band. It was established that the influence of the frequencies of the resonance band on the damageability grows with an increase in the quality factor and the slope of the fatigue curve, the width of the resonance band is determined by the quality factor, the dependence f(t) is the most effective in vibration tests, at which the rate of frequency change remains constant over the entire range.
Keywords

vibration resistance, sinusoidal vibrations, fatigue damage, oscillating frequency, damage summation
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2_2020_sen_4

Title of the article

METHOD FOR CALCULATING THE PARAMETERS OF SHOCK PULSES IN BEARINGS WITH LOCAL DAMAGES TO RACEWAYS
Authors

ISHIN Nikolay N., D. Sc. in Eng., Assoc. Prof., Chief of the R&D Center “Mining Machinery”, 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.

GOMAN Arkadiy M., Ph. D. in Eng., Assoc. Prof., Head of the Department of Dynamic Analysis and Vibration-based Diagnostics of Machines, 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.

SKOROKHODOV Andrey S., 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.

DAKALO Yuriy A., Ph. D. Student, Joint Institute of Mechanical Engineering of the NAS of Belarus, Minsk, Republic of Belarus
In the section DYNAMICS, DURABILITY OF VEHICLES AND STRUCTURES
Year 2020 Issue 2 Pages 37–45
Type of article RAR Index UDK 621.833 Index BBK  
Abstract The method proposed in the article for calculating the parameters of shock pulses generated in rolling bearings when local defects occur is a development of research in the scientific direction of vibration-pulse diagnostics in relation to the operational assessment of the technical condition of rolling bearings of transmission units of mobile vehicles operating under variable load-speed conditions. An example of calculating the parameters of the shock pulse in ball radial single-row bearings of the 307 series is given, when the rolling body passes through a rectangular defect on the outer raceway.
Keywords

bearing, technical condition, local damage, diagnostics, shock pulse, shock pulse parameters
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Bibliography
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2_2020_sen_2

Title of the article

AUTOMATIC TRANSMISSIONS: ANALYSIS AND PROSPECTS FOR USE IN HYBRID AND BATTERY ELECTRIC VEHICLES. PART 1
Authors

KRASNEVSKIY Leonid G., Corresponding member of the NAS of Belarus, D. Sc. in Eng., Prof., Chief Researcher, Joints 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 MECHANICS OF MOBILE MACHINES
Year 2020 Issue 2 Pages 16–29
Type of article RAR Index UDK 62-235 Index BBK  
Abstract An assessment of the prospects for using automatic transmissions (AT) on hybrid and battery electric vehicles is given, which is based on an analysis of their current state and strategies of leading manufacturers. The article gives the analysis of production volumes of this equipment with various types of ATs and its application in the countries of North America and Europe predicted until 2030, as well as published data on their technical characteristics and technical and economic indicators. A significant increase in the production of the main types of hybrid electric vehicles (HEV), and therefore the ATs used in them, is predicted. It is shown that the use of ATs makes it possible to increase the energy efficiency of electric vehicles. For HEVs, this is confirmed by the experience of mass operation of passenger cars and commercial vehicles. The paper shows the data on the creation by ZF Friedrichshafen AG of a new generation of eight-speed ATs for medium, full and plug-in hybrid electric vehicles (PHEV) in the power range of 24–160 kW using the modular technology created by ZF Friedrichshafen AG. The company estimates that by 2030, at least 70 % of all new cars will have an internal combustion engine (ICE). And here are the prospects for the use of PHEVs. It is shown that commercial battery electric vehicles (BEV) are becoming one of the main directions of electrification of road transport. The next possible step in their development is the use of multi-stage systems to improve energy efficiency, which is being worked on by more and more vehicle and transmission manufacturers. The article considers new technologies for selecting the architecture and topology of a hybrid power unit (HPU) with combinatorial generation of sets of options, their complete search and rejection, which actually perform the synthesis of circuits, and at subsequent stages — complex optimization, which includes the selection of component dimensions, minimizing fuel and energy consumption. They make it possible to automate the optimal design of the HPU. The article consists of two parts.
Keywords

automatic transmissions, hybrid electric vehicles, battery electric vehicles
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