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ELECTRICAL CONTACT PROPERTIES OF THE MATERIAL
CONTAINING REFRACTORY COMPONENTS. COMPOSITE COPPER -
TUNGSTEN CARBIDE
Authors: V.V. IZMAILOV, Dr. Sc., M.V. NOVOSELOVA, Cand. Sc.
Abstract: The results of a study of the main electrical contact characteristics of a composite
powder material based on a copper with different contents of tungsten carbide are presented.
The electrical resistivity, hardness, and electrical erosive wear of the investigated samples
are presented in absolute values and in comparison, with similar characteristics of the
reference material – electrical copper – depending on the composition of the composite, the
modes of its manufacture and the polarity of the sample (sample – anode and sample –
cathode).
Keywords: композиционный материал, медь, карбид вольфрама, электропроводность, электроэрозионный износ, температура спекани
ELECTRIC CONTACT PROPERTIES OF THE MATERIAL
CONTAINING REFRACTORY COMPONENTS.
DIAMOND-CARBIDE COMPOSITE BASED ON COPPER
Authors: V.V. IZMAILOV, Dr. Sc., M.V. NOVOSELOVA, Cand. Sc.
Abstract: The results of the study of the main electrical contact characteristics of composite
powder materials on a copper base with additions of chromium and tungsten carbides are
presented. The electrical resistivity, hardness and electrical erosion wear of the studied
samples are presented in absolute values and in comparison, with similar characteristics of the
reference material – electrical copper – depending on the composition of the composite, the
modes of its manufacture and the polarity of the sample (sample – anode and sample –
cathode).
Keywords: composite material, copper, chromium carbide, tungsten carbide, electrical
conductivity, electroerosive wear, sintering temperature.
METHOD FOR REINSTALLING A WORKPIECE
INTO A THREE-JAW MECHANIZED CHUCK
Authors: A.P. ARKHAROV, Cand. Sc
Abstract: The analysis of the known methods of reinstalling workpieces into power chucks is
carried out. Their advantages and disadvantages are revealed. The essence and
implementation of the developed method are disclosed. It is compared with similar known
solutions. The originality of the method and the achieved technical result are reflected.
Keywords: reinstallation, method, workpiece, fastening, chuck, accuracy, automation.
METHODS OF LAYER-BY-LAYER SYNTHESIS OF METAL PRODUCTS
Authors: D.D. Kakorin, undergraduate, A.Yu. Lavrentev, Cand. Sc.
Abstract: The article describes the most widely used methods of layer-by-layer synthesis of
metal parts. The technology of layer-by-layer synthesis using electric arc surfacing with a
wire additive is considered. The possibilities of electron-beam and laser layer-by-layer
synthesis of the product are shown. Comparative characteristics of various methods of
producing parts by layer-by-layer surfacing are given. The use of wire additives as a starting
material for the serial production of parts in production is recommended. Such technologies
will reduce the cost of the product despite the need to use mechanical processing of the most
precise surfaces.
Keywords: additive technologies, layer-by-layer synthesis, surfacing, sintering of
metals.
CUTTING TEMPERATURE WHEN USING A MULTI-COATED TOOL
Authors: M.Sh. MIGRANOV, Dr. Sc., A.M. MIGRANOV, Postgraduate
S.R. SHEKHTMAN, Dr. Sc.
Abstract: In the work, analytical calculations are carried out and the nature of the distribution of
heat fluxes in the cutting zone when using wear-resistant coatings is established.
Thermophysical phenomena in the cutting zone are modeled when using composite wearresistant coatings on a cutting tool with the effect of self-organization under friction
conditions. To confirm the phenomenon of self-organization and redistribution of heat fluxes
in the contact zone, a series of adhesive, wear-resistant, temperature and force studies were
Вестник Тверского государственного технического университета.
Серия «Технические науки». № 3 (11), 2021
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carried out when turning various grades of steels and alloys. An increase in the wear
resistance of a cutting tool with a multilayer composite coating is established by redistributing
the heat flux in the cutting zone due to the formation of protective shielding secondary
structures.
Keywords: metal cutting, friction, wear, wear-resistant coatings, thermodynamics,
tribosystem, self-organization, secondary structures, thermal conductivity, cutting
temperature, wear resistance.
INCREASING THE EFFICIENCY AND RELIABILITY OF THE BUCKET
ELEVATOR OF THE SCRAPER-HOPPER MACHINE FOR HARVESTING
MILLED PEAT
Authors: А.L. YABLONEV, Dr. Sc., A.I. NEKRASOVA, postgraduate
Abstract: Cases of failures of peat scraper-bunker harvesting machines are analyzed. It has been
proven that the main cause of failures is the stumpiness of the peat deposit. When interacting
with the stump, there is a sharp increase in the load on all elements of the transmission of the
machine, which leads to their temporary exit from the working state. The first element that the
stump encounters is the machine's elevator bucket. As a result of interaction, the ladle is
damaged in the form of ruptures, incipient and developed cracks. Proposals are formulated to
Вестник Тверского государственного технического университета.
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increase the reliability and efficiency of the scraper-bunker peat harvesting machine by
installing a simple tracking device for the operation of the bucket elevator and improving the
design of the elevator bucket itself. It is noted that due to the initiation and development of
cracks in the zone of welded seams, buckets must be subjected to flaw detection at least once
a year, during pre-season maintenance.
Keywords: scraper-bunker harvester, milled peat, bucket, bucket elevator, crack
initiation and development, stumpiness, ultrasonic flaw detection.
SYSTEM FOR RESULT ANALYSIS OF WEAR TEST
FOR TRIBOELEMENTS OF PEAT MACHINES
Authors: I.V. GORLOV, Dr. Sc.
Abstract: The article describes the system for the analysis of tribotechnical tests, which allows,
on the basis of objective control data, to assess the state of the object under study on the basis
of complex processing of information obtained in the process of research. The use of the
Вестник Тверского государственного технического университета.
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proposed dynamically variable information processing system makes it easy to correct the
testing process of tribo assemblies in order to obtain the required parameters for analyzing the
measurement results.
Keywords: peat machines, operation, modernization, reliability, resource, friction
units, research.
SIMULATION OF LASER CUTTING OF ROLLED STEEL
Authors: D.A. ZORENKO, Cand. Sc.
Abstract: The article presents the main results of CAE-modeling of the process of laser cutting
of steel sheet products. The features of the creation of computational models and the process
parameters obtained with their help are considered. The pictures of temperature fields and
pressure distribution are obtained.
Keywords: laser cutting, temperature field, finite element method, steel sheet rolling,
laser cutting, calculation model.
INSTALLATION OF A MONITORING SYSTEM FOR ENGINEERING
STRUCTURES FOR CONSTRUCTION PROJECTS IN HIGH-ALTITUDE AREAS
Authors: S.V. CHEREMNYKH, Cand. Sc.
Abstract: The article considers the use of innovative equipment capable of monitoring changes
in the state of the foundations and supporting structures of buildings and structures in real
time. Equipping the construction site with a monitoring system is carried out for the first time,
Вестник Тверского государственного технического университета.
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while the study of the components and details of the structure itself is not carried out. The
general materials of the designed building are used as the basis. For the structure monitoring
system, the purpose of its use and the tasks that ensure the safety and durability of the
construction object are highlighted. The installation of the points of the statistical diagnostic
system is carried out on the objects of the tunnel under the ski slope and the metal roof of
the fire station and serves to prevent violations of the normal state of the structures, as well
as the loss of their load-bearing capacity. According to the results of the study, critical loadbearing structures are identified, which should be paid attention to when operating the
object.
Keywords: monitoring system of engineering structures, load-bearing capacity, stressstrain state, measuring points of statistical diagnostic system, monitoring.
THE USING OF AUTOMATION TYPICAL SOFT
AND HARDWARE TOOLS FOR LEVEL CONTROL
IN STEAM GENERATOR OF KALININ NUCLEAR POWER PLANT
Authors: O.L. AKHREMCHIK, Dr. Sc.
Abstract: The functions of the water level control system in the steam generator are
distinguished. It is proposed to consider two control phases in normal operation and
protection control modes. The automation system sets priorities for the operation of the steam
generator level stabilization and over-protection control systems, which are considered as
basic properties of signals. The signal model is considered as a combination of sets of a basic
property description, an extended property description, and a set reflecting the specifics of the
unified means application. The first set includes parameter name, current value, time stamp,
priority, upd ate and validity signs, se t point, change range boundaries. Extended set includes
number of GET-plan, addressing of communication module for signal transmission, hysteresis
for set point, list of events in case of deviations in control problem solution. Properties related
to TPTS using are sign of presence of general type interference, freely designed feature, error
in memory, power supply failure, ADC failure.
Keywords: automation, model, complex, level, control, reliability, function, module,
signal.
USE OF THE BROWN MODEL IN ANALYSIS OF EXPERIMENTAL DATA
(COMPUTER INTERPRETATION)
Authors: T.B. YAKONOVSKAYA, Cand. Sc., A.I. ZHIGULSKAYA, Cand. Sc.
Abstract: The article describes the experience of using Brown's model to analyze the results of
an experiment to study the technological process of drying peat. An algorithm for
constructing a Brown model based on the main parameters of the drying process is presented.
The degree of adaptability of the exponential smoothing model in experiments and the type
of the investigated processes are determined. The methodological basis for the analysis of
experimental data is a systematic approach.
Keywords: peat, experiment, drying process, system approach, time series analysis,
non-stationary process, Brown's model, random walk model
SELECTION OF THE STRUCTURE OF THE AUTOMATED BACKUP SYSTEM
USED IN THE SYNCHRONOUS DIGITAL HIERARCHY TECHNOLOGY
IN THE DESIGN OF THE DATA EXCHANGE NETWORK
Authors: V.K. KEMAYKIN
, Cand. Sc., V.M. LANCHEV
, Cand. Sc.,
A.A. SMELOVSKAYA
, student
Abstract: The article presents the choice of the structure of automated reservation systems. At
the present stage of development and transfer of data exchange networks to digital
telecommunications equipment, issues related to the introduction of automated systems for
reserving network data using synchronous digital hierarchy technology are becoming
increasingly important to improve the reliability of these networks and provide the required
bandwidth for transmitting various types of information.
Keywords: asynchronous method of data transmission, throughput, improving the
reliability of data networks