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ASSESSMENT OF THE PROBABILITY OF ELECTROCHEMICAL CORROSION DURING THE FORMATION OF MICROPLASMA OXIDE COATINGS
Authors: A.N. BOLOTOV,
V.V. NOVIKOV,
O.O. NOVIKOVA
Abstract: Modification of parts surfaces by forming oxide coatings using the microplasma method is used in industry to improve their tribomechanical and anticorrosive properties. Since the nature of the oxidation process is multifactorial, the probability of damage to the part due to the occurrence of electrochemical corrosion is significant. The article establishes criteria indicating the occurrence of corrosion on the surface of the product at various stages of the oxidation process. It is shown that in the process of violation of the continuity of the coating, the conductivity of the oxide layer changes, which is reflected in the course of the forming voltage curves on the workpiece. A criterion for assessing the probability of corrosion during microplasma oxidation is proposed. The possibility of early detection of the onset of coating destruction under the action of electrochemical corrosion without going through a full cycle of modifying the surface of the part will increase the economic efficiency of microplasma oxidation.
Keywords: microplasma oxidation, microarc oxidation, electrochemical corrosion, damage area, ceramic coatings
THE EFFECT OF LASER TREATMENT CONDITIONS
ON TRIBOTECHNICAL CHARACTERISTICS OF HIGH-SPEED STEEL SURFACE
Authors: V.V. IZMAILOV,
M.V. NOVOSELOVA
K.A. SAKHAROV
Abstract: The article describes the results of experimental studies of the tribological characteristics (hardness, friction coefficient, wear intensity) of high-speed steel after laser surface treatment. The analysis of the influence of the energy parameter of laser treatment (laser radiation energy per unit area of the treated surface) on the tribological characteristics of the high-speed steel surface is carried out.
Keywords: laser treatment, high-speed steel, hardness, friction coefficient, wear intensity
PRECISION DIAMOND-ABRASIVE PROCESSING
OF CERAMIC MATERIALS
Authors: A.N. BOLOTOV,
V.V. NOVIKOV,
O.O. NOVIKOVA
Abstract: The influence of load-speed wear conditions and the structural composition of ceramic diamond material on the grinding performance and consumption of abrasive tools is investigated. It is established that the determining factors are the load on the tool, its grain size and diamond concentration, the physical and mechanical properties of interacting materials, and the feed depth. The ratios of abrasive wear parameters depending on the type of grinding were obtained. Practical recommendations are given on the selection of ranges of grain size, diamond concentration, grinding depth, and processing speed. The diamond grades are evaluated.
Keywords: precision machining, grinding performance, diamond consumption, grinding modes, diamond-abrasive processing, ceramic binder
ABRASIVE WEAR RESISTANCE OF CHROMIUM-NICKEL DEPOSITED COATING
Authors: M.V. NOVOSELOVA,
L.E. AFANASIEVA
Abstract: The article presents the results of experimental studies of abrasive wear resistance of coatings formed by plasma-powder surfacing at different arc currents. The powder of chromium-nickel alloy of the Colmonoy 315-P2 brand was used. Laboratory tests for wear on fixed abrasive revealed significant heterogeneity of wear resistance of the studied nickel surfacings, which may indicate non-uniform mechanical properties and structure of the surface layer of the deposited material. In terms of wear resistance, the studied coatings belong to class 6, which can be considered an average result.
Keywords: plasma powder welding, chromium-nickel alloy, abrasive wear resistance, hardness
OPTIMIZATION OF THE ENERGY MODE OF LASER CUTTING
OF BIMETALLIC MATERIAL BY THE CRITERION OF MINIMUM ROUGHNESS
Authors: V.V. IZMAILOV,
M.V. NOVOSELOVA,
L.E. AFANASIEVA
Abstract: The article is devoted to the study of the influence of laser cutting parameters on the quality of the cut surface. The object of the study is a bimetallic material, which is high-speed steel deposited on a structural steel substrate. The roughness parameter Rz5 according to GOST R ISO 9013-2022 serves as the cut surface quality criterion, and the complex parameter q, which has the physical meaning of the laser radiation energy per unit area of the cut surface, serves as a characteristic of the cutting modes. A non-uniform distribution of the parameter Rz5 over the cut surface is revealed, which is illustrated by the graphical dependencies Rz5(x / h), where x is the distance from the upper edge of the cut, h is the thickness of the cut sample. Optimum values of the complex energy parameter q for this bimetallic material, providing minimum roughness values, are experimentally determined.
Keywords: laser cutting, energy parameters, surface roughness, deposition, high-speed steel, bimetal
ABOUT THE CHOICE OF THE LONGITUDINAL BASE OF A TRAILER-TOWED PEAT PROFILING MACHINE
Authors: А.L. YABLONEV
Abstract: The surface relief of peat fields has one of the decisive effects on the technological parameters of milled peat extraction. It is possible to maintain the surfaces of the field in proper condition not only by regular re-profiling with large auger profilers-planners, which, in fact, is a very energy-intensive operation, but also by systematically using technological extraction equipment with profiling properties. The most important parameter of such trailed profiling machines is the longitudinal base. The article provides a method for selecting the longitudinal wheelbase of a trailed peat profiling machine depending on the actual parameters of the relief (amplitude and step of oscillations) when reducing the profiles of the surface of the bog to averaged deterministic functions.
Keywords: map field, surface relief, copying, profiling, unevenness radius, mining milling machine, profiler-planner
METHODOLOGY OF INVENTORY OF THE PEATLANDS
OF THE RUSSIAN FEDERATION FOR THE IMPLEMENTATION
OF GEOTECHNOLOGIES AND OBJECTIVES
OF THE NATIONAL GREENHOUSE GAS CADASTRE
Authors: K.L. SHAKHMATOV,
T.V. ORLOV,
O.V. PUKHOVA,
M.V. ARKHIPOVA,
V.V. BONDAR
Abstract: The article discusses methodological approaches to inventorying the current state of peat birthplaces for the purposes of selecting a site for climate projects, as well as to clarify the areas and state of peatlands for conducting an inventory of anthropogenic young greenhouse gases. A sequence of actions, as well as materials and methods for achieving the stated goals are proposed. The results of practical implementation of the developed algorithm of actions are also presented using the example of two municipalities of the Tyumen region.
Keywords: peatlands, peatland inventory, drained peatlands, greenhouse gas inventory, climate project
CREATING AND EVALUATING OF HELICAL-BEVEL GEAR 3D MODEL
OF MINING MACHINERY TRANSMISSION
Authors: Q.H. PHAM,
H.T. DINH,
V.T. PHAM,
M.Yu. KUKHAR
Abstract: The article presents the main stages of creating a 3D model of a helical-bevel gear train using the Autodesk Inventor software package. The 3D model of the gears transmissions was constructed by calculating the coordinates of a grid of points on the tooth surface in the MITCalc software module. The results of checking the geometric parameters and evaluating the engagement of the computer model confirm its high accuracy and good convergence with the design calculations. The resulting virtual copy can be used to simulate the operation of a helical-bevel gear transmission, as well as in the manufacture and repair of its elements.
Keywords: Helical-bevel gear, mining machines, design, 3D model, Autodesk Inventor, MITCalc, geometric parameters, accuracy, operability
TECHNOGENIC SOIL SALINIZATION IN THE FAR NORTH:
A REVIEW ON CHALLENGES AND POTENTIAL SOLUTIONS
Authors: A.S. DANILOV,
E.A. KREMCHEEV
Abstract: Salinization is considered as a major factor that have negatively affected over
1 billion hectares of soils among the world and persist with a growth rate of 1.5 million hectares per year. The problem of salinity is primarily associated with agricultural land in arid zones, however, mining enterpris-es also increase the amount of saline soils by extracting brines and overburden to the surface. Salinization processes in the Arctic regions of Russia are more acute, since salts contribute to the development of thermokarst, thermal erosion and solilux processes, due to which the level of permafrost deepens and chemozems are formed near industrial sites. Scientists are considering various methods of recultivation of saline soils, which can be divided into three areas: increasing the salt tolerance of plants, selecting stress-resistant plants (halophytes) and increasing the bio-genicity of techno-soils. However, in the Arctic regions with harsh climatic conditions and low biological productivity, restoration methods require careful selection, especially on disturbed soils in the mining industry. In this connection he purpose of this review article is to use available sources and published literature on soil salinisation in general, and particularly in the Far North, to highlight available methods for reclamation of areas affected by salinisation in mining.
Keywords: soil degradation, salinization, secondary salinization, Far North, salt tolerance, halophytes, biogenicity
ANALYSIS OF THE EFFICIENCY OF THE UNIT FOR THE COMPLEX PROCESSING OF ROCKS WITH PLASTIC PROPERTIES
Authors: I.V. GORLOV,
P.E. MITUSOV
Abstract: The article presents an analysis of typical units for classification and grinding of materials. A new type of complex unit is proposed, which can be used for processing weak materials with significant plastic properties. The proposed unit will allow both grinding and classification of the studied rocks within a single cycle, excluding additional transportation and intermediate storage of the processed product. An original design of a complex unit - a grinder-classifier is proposed, and its operating principle is described. Some elements of engineering calculations for determining the most important process parameters in the processing of rocks with significant plastic properties are also presented. The paper presents the results of the analysis of the growth of process efficiency when using a grinder-classifier for processing weak rocks with significant plastic properties.
Keywords: grinding, classification of rocks, energy method, shear stresses, grinder shaft, perforated drum, efficiency
MODELING THE CONSTRUCTION OF A MOBILE OBJECT'S TRAJECTORY BASED ON MULTICRITERIAL OPTIMIZATION METHODS
Authors: M.I. BESKHMELNOV,
B.K. LEBEDEV,
O.B. LEBEDEV
Abstract: This paper presents a detailed analysis of a hybrid route planning algorithm designed for navigation in two-dimensional space taking into account partial uncertainty in terrain information. This innovative approach combines the advantages of the wave algorithm and the ant colony algorithm, which allows for the efficient construction of the shortest trajectories in real time, while simultaneously optimizing other important route parameters, such as avoiding difficult sections or taking into account preferred terrain types. The algorithm operates in stages, alternating the processes of constructing a trajectory section and the actual movement of an object along it. Each planning stage is divided into two levels. At the first level, a local visibility zone of the object is formed and the region covered by it is determined on the map. Then, sequentially, step by step, the algorithm builds a chain of interconnected regions, each of which contains information about localized obstacles. The second level of the algorithm is responsible for creating a set of possible trajectories for the object to pass through each of the regions identified at the first level. An important feature is the use of the ant algorithm at this stage, which allows one to effectively explore the space of options and find optimal paths that minimize various criteria, including path length.
Keywords: trajectory, algorithm, situational planning, partial uncertainty, local visibility zone, moving object