VORONEZH SCIENTIFIC AND TECHNICAL
JOURNAL
3(37)2021
Technology and equipment for mechanical and physical-technical processing
Boldyrev, A. I. Influence of electrolyte flow parameters during electrochemical dimensional processing on
Boldyrev A. I., Boldyrev A. A., Sukhorukov V. N., Starodubtsev I. G. quality of hole formation in parts of rocket and space technology // Voronezh Scientific and Technical Bulletin. - 2021. - V. 3, No. 3 (37). - P. 3-10. Access mode: http://vestnikvglta.ru/arhiv/2021/3-3-37-2021/3-10.pdf - Head. from the screen. – DOI: 10.34220/2311-8873-2022-3-10.
Annotation. The paper presents the results of a study of the influence of the schemes for the supply and removal of the electrolyte flow and its parameters (electrolyte pressure at the inlet РВХ and pressure drop Δр) on the quality of electrochemical shaping of holes in samples of stainless and titanium alloys used in the manufacture of parts of rocket and space technology. It is shown that the change in РВХ and Δр has a significant effect on the quality of hole formation. It has been experimentally established that the lateral electrolyte supply scheme is preferable.
Keywords: ELECTROCHEMICAL HOLING, ELECTROLYTE FLOW SUPPLY, STAINLESS AND TITANIUM ALLOYS.
Topolyansky, P. A. Adhesion characteristics of a thin-film coating deposited during finishing plasma hardening / P. A. Topolyansky, S. A. Ermakov, A. P. Topolyansky // Voronezh Scientific and Technical Bulletin. - 2021. - V. 3, No. 3 (37). - S. 11-27. Access mode: http://vestnikvglta.ru/arhiv/2021/3-3-37-2021/11-27.pdf - Head. from the screen. – DOI: 10.34220/2311-8873-2022-11-27.
Annotation. The methodology for determining the adhesive characteristics of thin-film coatings applied from the vapor phase and used to protect parts from wear and corrosion is considered. The study of adhesive properties, along with the determination of thickness, elemental composition, structure, physico-mechanical, tribological characteristics, and wear coefficient, makes it possible to evaluate and select the optimal coating and its application technology for a specific industrial application. Using the a-C:H/a-SiOCN system diamond-like coating DLCPateks, deposited during finishing plasma hardening, as an example, the adhesion characteristics were evaluated according to ISO 20502:2005 by scratch testing and according to ISO 26443:2008 by indentation of a Rockwell diamond indenter. The first tests are related to determining the load at which the depth of indenter entry into the coating-substrate composition ceases to grow smoothly, which characterizes the moment of coating failure. The ratio of the load on the indenter, determined at the end of the passage of the coating thickness, to the load of the appearance of the first cracks or delaminations in these tests is conventionally called the adhesion coefficient. The influence of the coating thickness on the adhesion coefficient has been studied. Tests involving the use of a Rockwell diamond indenter qualitatively evaluate the adhesion properties of a coating by comparing the obtained and normalized prints. The results of the research have proven the increased adhesion characteristics of the DLCPateks coating.
Keywords: COATING, ADHESION, ADHESION STRENGTH, SCRATCH TEST, FINISH PLASMA HARDENING.
Al-Bdeyri, M. Sh. Kh.Krasilnikov, A. M. Kadyrmetov, S. V. Sergeev // Voronezh Scientific and Technical Bulletin. - 2021. - V. 3, No. 3
(37). - S. 28-35. Access mode: http://vestnikvglta.ru/arhiv/2021/3-3-37-2021/28-35.pdf - Head. from the screen. – DOI: 10.34220/2311-8873-2022-28-35.
Annotation. A technology is proposed for creating heat-shielding wear-resistant coatings on the surface of parts of a cylinder-piston group (CPG) made of AK12MMgN alloy using a galvanoplasmic modification of microarc oxidation. For this purpose, a complete three-factor experiment of type 23 was carried out in the form of half-replicas of coating deposition. The dependences of the thickness, microhardness, wear resistance and porosity of the galvanic plasma coating on the technological parameters of the process are established. This technology seems to be effective, since it reduces fuel consumption by 5-7% and increases engine power by 8% while ensuring optimal properties of the heat-shielding layer.
Keywords: CYLINDER-PISTON GROUP, GALVANOPLASM MODIFICATION, HEAT-PROOF WEAR-RESISTANT COATING, FULL FACTORY EXPERIMENT, DISPERSION, FISHER CRITERION, REGRESSION EQUATIONS.
Nekrylov, A. M. Pulse-shock treatment of narrowing interscapular channels / A. M. Nekrylov, S. N. Kodentsev, A. O. Rodionov // Voronezh Scientific and Technical Bulletin. - 2021. - V. 3, No. 3 (37). - S. 36-41. Access mode: http://vestnikvglta.ru/arhiv/2021/3-3-37-2021/36-41.pdf - Head. from the screen. – DOI: 10.34220/2311-8873-2022-36-41.
Annotation. A technique and technological support for the specified parameters of the surface of a narrow narrowing channel with a swirl along the radius and a procedure for designing combine operations have been created.
of pulse-force hardening, a new patentable technological process for hardening narrow narrowing curvilinear channels by combined pulse-impact action with the advancement of a free tool (spherical granules) under conditions of low-frequency vibrations has been developed.
Keywords: IMPULSE-IMPACT HARDENING, COMBINED HARDENING, LOW-FREQUENCY OSCILLATIONS, HARDENING MODES, COATING, INTERBLADE CHANNEL.
Engineering technology
Lebedev, V. A. Calculation of technological factors of finishing processing of long parts in screw
rotors / V. A. Lebedev, N. S. Koval, Al-Obaidi L. M. Rajab // Voronezh Scientific and Technical Bulletin. -2021. - V. 3, No. 3 (37). - S. 42-51. Access mode: http://vestnikvglta.ru/arhiv/2021/3-3-37-2021/42-51.pdf - Head. from the screen. – DOI: 10.34220/2311-8873-2022-42-51.
Annotation. The essence of helical rotors and their technological capabilities for finishing long parts are shown; Analytical dependencies are proposed for calculating the specific metal removal, duration and geometric dimensions of the part, rotor, granules of the processing medium, which provide the required quality of parts and processing performance in screw rotors.
Keywords: SCREW ROTOR, PROCESSING ENVIRONMENT, FINISHING, SPECIFIC METAL REMOVAL, PRODUCTIVITY.
Rapatsky, Yu. L. Application of the semi-Markov model for the study of the parameters of mechanical assembly
production taking into account various types of failures / Yu. L. Rapatsky, V. M. Lipka // Voronezh Scientific and Technical
messenger. - 2021. - V. 3, No. 3 (37). - S. 52-64. Access mode: http://vestnikvglta.ru/arhiv/2021/3-3-37-2021/52-64.pdf - Head. from the screen. – DOI: 10.34220/2311-8873-2022-52-64.
Annotation. A technique for studying the productivity and reliability of technological processes of mechanical assembly production at the stages of the life cycle of mechanical engineering products is proposed. A semi-Markovian mathematical model is proposed, which makes it possible to analyze, for example, technological processes for the manufacture of threaded connections. In the proposed model, the distribution functions (DF) of the service time of a unit of production are determined, taking into account failures. FDs make it possible to ensure the information consistency of models of various hierarchical levels and to explore the relationship between the stages of the life cycle of engineering products.
Keywords: SEMI-MARKOV MODEL, TECHNOLOGICAL HEREDITY, LIFE CYCLE STAGES.
Smolentsev, V. P. Finishing and cleaning of transitional sections of machine parts / V. P. Smolentsev, E. V. Smolentsev, Yu. S. Zolototrubova, V. G. Gritsyuk // Voronezh scientific and technical bulletin. - 2021. - V. 3, No. 3 (37). – S. 65-75. Access mode: http://vestnikvglta.ru/arhiv/2021/3-3-37-2021/65-75.pdf - Head. from the screen. – DOI: 10.34220/2311-8873-2022-65-75.
Annotation. The article discusses the methods of finishing and cleaning, including the design of an electrochemical processing process. The features of various schemes for the use of electrodes and tools are shown, which make it possible to achieve the necessary quality indicators while ensuring high productivity.
Keywords: COMBINED PROCESSING, ELECTROCHEMICAL PROCESSING, TECHNOLOGY, QUALITY.
Operation of road transport
Posmetiev, V.I., Nikonov, V.O., A.V.
Avdyukhin // Voronezh Scientific and Technical Bulletin. - 2021. - V. 3, No. 3 (37). - S. 76-94. Access mode :
http://vestnikvglta.ru/arhiv/2021/3-3-37-2021/76-94.pdf - Head. from the screen. – DOI: 10.34220/2311-8873-2022-76-94.
Annotation. The main advantages of using timber tractors with semi-trailers in comparison with single timber trucks and timber trucks with trailers are listed. The analysis of the results of scientific works of foreign authors involved in improving the efficiency of timber tractors with semi-trailers in the process of hauling timber has been carried out. The existing conditions for the removal of timber in the Russian Federation by timber tractors with semi-trailers are considered. The negative consequences that manifest themselves in the process of moving along logging roads, limiting the efficiency of using logging tractors with semi-trailers, are described. Among them, the most significant one was singled out, which consists in the occurrence of significant efforts during braking of a timber tractor with a semi-trailer in a fifth wheel coupling, accompanied by the appearance of cracks in the elements of the carrier system, breakdowns in the coupling device, as well as the folding of a timber road train. The schemes of forces acting on a timber tractor with a semi-trailer in the process of braking are presented. The dependences of the change in the braking forces of the axles of a timber tractor with a semi-trailer are given, taking into account the non-simultaneous operation of their brake mechanisms, as well as the change in force in the fifth wheel of a timber tractor with a semi-trailer during braking. In order to increase
efficiency of a timber tractor with a semi-trailer, a promising design of a recuperative fifth wheel coupling is proposed.
Keywords: FOREST ROAD, TIMBER TRACTOR, SEMI-TRAILER, FITCH, ENERGY RECOVERY, BRAKING PROCESS, KINETIC ENERGY,
HYDRAULIC ENERGY.
Zhachkin, S. Yu. Patterns of the influence of operational parameters of plain bearings of motor vehicles on the temperature in the friction zone as a resource factor / S. Yu. Zhachkin, N. A. Penkov, S. V. Lazarev, G. I. Trifonov // Voronezh Scientific Research -technical bulletin. - 2021. - V. 3, No. 3 (37). - S. 95-101. Mode
access: http://vestnikvglta.ru/arhiv/2021/3-3-37-2021/95-101.pdf - Head. from the screen. – DOI: 10.34220/2311-8873-2022-
95-101.
Annotation. The results of a study of the dependence of the temperature of the friction zone of two bodies (shaft and inner sleeve) on the operating parameters of a plain bearing, such as pressure, sliding speed and radial load in terms of the resource of a friction pair, are presented. On the basis of a multifactorial experiment, a regression equation for the friction process is obtained, taking into account the influence of these parameters on the temperature in the contact zone, which makes it possible to determine the boundaries of the trouble-free operation of friction pairs of motor vehicles. Technological ways of solving the provision of the specified performance of a friction pair according to the temperature criterion without scuffing are proposed.
Keywords: SLIDING BEARING, FRICTION, TEMPERATURE, PRESSURE, SLIDING SPEED, RADIAL LOAD, EXPERIMENT, RELIABILITY.
Posmetiev, V. I. Relevance of development and use in the design of a timber road trainrecuperative spring-hydraulic conic device / V. I. Posmetiev, V. O. Nikonov, A. E. Matyashov // Voronezh Scientific and Technical Bulletin. - 2021. - V. 3, No. 3 (37). - S. 102-116. Access mode: http://vestnikvglta.ru/arhiv/2021/3-3-37-2021/102-116.pdf - Head. from the screen. – DOI: 10.34220/2311-8873-2022-102-116.
Annotation. The advantages are described, as well as the possibilities inherent in timber tractors with trailers to achieve high technical and economic indicators, significantly exceeding those of single timber vehicles, as well as other comparable layouts of timber haulers. The analysis of the scientific works of foreign authors was carried out, which made it possible to identify the most significant factors on which the efficiency of the process of hauling long-length timber by timber tractors with trailers depends. The existing conditions for the hauling of long-length timber in the Russian Federation by timber tractors with trailers, as well as the negative consequences of their operation in difficult road and climatic conditions, are considered. It has been established that the insufficient equipping of logging roads is accompanied for logging road trains by a forced unsteady mode of movement, which leads to failure due to the impact of alternating loads from the side of the trailer-dissolution with timber of the pivot assembly of the rotary conic device of the logging tractor. In order to increase the efficiency of timber tractors with release trailers, as well as to minimize the negative impact on the pivot assembly of alternating loads from the forces of inertia of the release trailer with timber, a promising scheme of a recuperative spring-hydraulic rotary conical device is proposed. The necessary and sufficient tasks for the creation and practical use of the proposed device are formulated.
Keywords: ROTARY BONE DEVICE, ENERGY RECOVERY, RELEASE TRAILER, TIMBER TRACTOR, TIMBER ROAD, BRAKING, TIMBER REMOVAL, EFFICIENCY.