bluuebunny/crossref_metadata_2025 huggingface dataset:
Organized selection of the set of carbide cutting inserts with coating for interlocking side milling cutters
Authors: Plotnikov A , Volk R
Published: January 2020

It was proposed to use a fundamentally new method of selection a set of carbide cutting inserts with coatings based on a preliminary estimate of their cutting properties using the thermo-emf value of the test run. The technique allows to increase the reliability of interlocking side milling cutters and rationally manage the increased efficiency of this type of tool.
An investigation of the influence of cam track manufacturing accuracy on the dynamics of automatic machine mechanisms
Authors: Telegin V V , Kozlov A M
Published: January 2020

The article deals with the application of dynamic analysis methods to study the efficiency of cam mechanisms depending on the accuracy of manufacturing their elements. It is commonly known that the successful choice of the cam track contour law significantly determines the level of dynamic loads in the mechanism and, hence, its reliability and efficiency. However, all efforts to create the “best” cam track contour law can be nullified by such a factor as the error in manufacturing its elements (primarily cams). The proposed paper analyzes the influence of the accuracy of manufacturing cam tracks for the transfer mechanism of the automated cold-upsetting machine contoured according to the sinusoidal, cosinusoidal and uniformly accelerated laws. Research was carried out for various speed modes of the mechanism operation. A technique for estimating the calculation of the error function parameters at which the dynamic processes in the mechanism increase sharply is given.
Designing the Structure of and a Fabrication Process for a Corrective Insole in CAD/CAE/CAM Systems
Authors: Nosov N V , Zyabochkina A P
Published: January 2020

This paper presents the results of our research into improving the design and fabrication quality of custom-molded corrective insoles by developing modern computer-aided modeling and programming methods that factor in changes in the mechanical properties of materials during use. This paper proposes a method for designing custom corrective insoles using the optimal insole structure and material. We used OrthoModel to design an insole model in a solid-body format and then exported it as an STL file. Then, using FreeCAD, we converted the STL file to a STEP file to better adapt the model for further use and analysis. Using the Ansys environment, we devised a finite element model for insole deformation and investigated the behavior exhibited by the material of the insole arch under different loads and combinations of EVA materials with varying hardness. The model yielded the stresses and deformations experienced by the insole arch during use, depending on the combination of the material and the geometry of the foot, and those stresses and deformations were experimentally verified. The calculated values for insole deformation served as input for programming the processing of the insole with a CNC machine. With a 3D insole model, it is possible to both fabricate the insole with a CNC machine and to print the insole with a 3D printer. The calculated cost price of fabricating custom-molded corrective insoles attests to the competitiveness of the proposed technique.
Coupled CFD-based Shape Optimization of a Wing of Reusable Space Vehicle of Tourist Class
Authors: Ashikhmina E R , Prosuntsov P V
Published: January 2020

This article proposes an approach to two-stage shape optimization of the wing of tourist class reusable space vehicle. To achieve appropriate lift and drag force levels, CFD-based optimization methods in combination with geometric parametrisation was applied. During the first stage, the optimization focuses on reduction of wing square and providing required velocity during vehicle’s landing. In this case, for improving the aerodynamic and mass characteristics five geometric design variables were used. The second stage of optimization emphasis on drag force minimization in order to enhance the wing shape in assigned design area by means of adjoint discrete method.
Investigation of dynamic lo dynamic loading of the traveling system of track-type tractor
Authors: Vyaznikov M V , Vyaznikov A M
Published: January 2020

The article presents a technique for studying dynamic loading of the tracked vehicle undercarriage system. It includes developing a dynamic model of the undercarriage system for loads simulation in typical loading modes and finite element models of the undercarriage component parts to determine the stress-strain state and the safety factor of the parts for each computational case. The undercarriage system is described as a set of solid bodies connected by elastic-damping force elements among themselves, and with a ground contact area for a numerical solution of equations of motion. The time domain loads on the undercarriage system components obtained according to such a model in typical loading modes are used to identify the most dangerous, from the point of view of strength, computational cases for each element. Loads for each computational case are transferred to finite element models of the undercarriage parts, which are used to evaluate the strength. The technique is displayed in typical modes “tilted down on the idler when lifting the blade” and “single rail crossing”. The problems of load transfer from a dynamic model to component finite element models are considered. The described technique improves the reliability of undercarriage strength estimate in typical operation modes and allows you to reasonably choose configuration parameters by considering a large number of complex spatial loading modes, taking into account the kinematics and elastic characteristics of the undercarriage system.
Two power split path hydrodynamic drive train of the commercial tractor
Authors: Vyaznikov M V , Vyaznikov A M
Published: January 2020

The article presents hydromechanical drive trains with a differential link at the input and output. As a differential link, three-link differential mechanisms with mixed gears mesh are used. The possible schemes of two-path hydrodynamic drive trains are investigated. It is shown that the operation mode of a two-path hydromechanical drive train is possible when the turbine wheel of the torque converter rotates in the direction opposite to the impeller rotation. This factor is taken into account when choosing the characteristics of a two-path hydromechanical drive train. It has been established that for the most common two-path hydromechanical drive train scheme, the planetary gear set characteristic reduction increases its maximum efficiency, decreases the torque converter active diameter and increases the relative speed ratio of the three-link differential spider pinion. It is shown that a two-path hydromechanical drive train in comparison with a one-path drive train allows for using more efficiently the engine transforming property to change the torque when changing the output load on the engine, which is very important for commercial tractors operating under variable load conditions.
Analysis of thermal stabilization process for organomorphic preforms made of oxidized polyacrylonitrile
Authors: Prosuntsov P V , Bogachev E A , Elakov A B
Published: January 2020

Simulation and analysis of thermophysical processes in PAN-fiber-based pressed samples that occurs during thermal stabilization were carried out. It is significant fact from the heat transfer point of view that the heat stabilization process proceeds with a definite exothermic effect. Herewith a strongly pronounced coupling between both the intensity of heat generation and the temperature level and heating rate at each point of the sample was observed. The influence of the main factors that effects on the sample temperature state, such as the density and thermal conductivity of the preform material, also the rate constants of the thermal stabilization process, was studied. The experimental data of the sample temperature state in the thermal stabilization process is presented and was compared with the analysis results.
Chassis design of skid steer loaders
Authors: Khomichev Alexey , Volkov Alexandr
Published: January 2020

The article provide analyzes the design features of the chassis components and assemblies of skid steer loaders. Describes the various options for frame design, engine layout and hydrostatic transmission. A comparison of the wheel and tracked propulsor used on loaders is given.
Special purpose composite materials for wheel-rail contact
Authors: Maiba Igor , Glazunov Dmitry , Maiba Vita
Published: January 2020

The paper deals with special-purpose friction materials for the contact «wheel-rail», designed to improve the adhesion of the locomotive wheels with the rails, reducing the resistance to the movement of the impact on the track, increasing the rolling stock wheels and rails resource. The authors used the generalized world and native experience in the application of existing and developed devices designed for the activators and modifiers applying in the contact zone «wheel-rail», as well as test results. The requirements to the methods of physical and chemical properties testing, to the values of the main indicators of physical, chemical and mechanical properties of friction activators and modifiers are presented, the requirements of the modifier and friction activator resource and friction coefficients from their application are substantiated. Needs to values of operational characteristics of activators and modifiers of friction which are established by results of field and operational tests carried out by special programs and techniques have been formulated.
Simulation of stress-strain state at the boundaries of a bimetallic composite to determine tear-off resistance
Authors: Zalazinskii A G , Kryuchkov D I , Shveikin V P
Published: January 2020

Simulation modeling of the deformation under mechanical action on the sample workpiece of the steel-aluminum bimetallic composite material with a thin aluminum intermediate layer was performed. The stress-strain state along the boundaries of the joint at which the sample workpiece layering occurs was determined. A series of computational experiments with varying the specific work value of the layering under separation conditions was implemented. The level of stresses, leading to the separation of the bimetallic compound, is estimated using the energy criterion. The dependence of the rupture strength along the ring contour on the specific work value of the layering varied in the range of 0.1-0.2 N/mm was calculated. It was established that for the studied variants of the computational experiment, a rigid stress state with the predominance of normal tensile stresses is implemented in place of the beginning of the layering.
Experiment-calculated estimation of the stability of arc welding technologies to be developed
Authors: Golubina S A , Bulychev V V
Published: January 2020

The article presents a method of calculating the stability assessment of welding quality indicators based on the use of deterministic dependencies and quite easily defined distribution laws of controlled parameters of the welding mode. Dependences for calculation of probability of reception of the set width of a welded seam depending on the law of distribution of linear energy are received. The use of this method will reduce the cost of experimental selection of welding modes, the production of full-scale samples for statistical quality control, to clarify the requirements for the welding equipment used.
Machine learning based approach to detection of anomalous data from sensors in cyber-physical water supply systems
Authors: Meleshko A V , Desnitsky V A , Kotenko I V
Published: January 2020

The paper proposes an approach to detection of anomalous data from sensors in cyber-physical systems on an example of a water supply supply system. The approach is based on methods of machine learning and modeling of technical systems. The primary data for machine learning was obtained on the developed software/hardware prototype of the water supply system by using a number of microcontrollers, sensors and actuators. The experiments confirmed the feasibility of the proposed approach. Several machine learning methods from scikit-learn library of the Python programming language were tested. As a result of the experiments we identified a learning method and its parameters ensuring the highest accuracy of the abnormal situations recognition.
Prevention of undercutting of the leg of the tooth of cylindrical helical gears during roughing and finishing gear processing
Authors: Safarov Damir , Kondrashov Alexey
Published: January 2020

The article discusses design factors leading to inconsistencies in the diametrical dimensions of the boundary point of the transition curve of the helical wheel. The conditions for the implementation of the graphic run-outs of the gear rack of a worm gear-cutting cutter, ensuring the formation of the active length of the involute wheel profile throughout its length, are formulated. The effect of a change in the design parameters of a helper milling tee on the duration of the interaction of the cutting edges and the diametric dimensions of the boundary points of the transition curve of the helical wheel is shown. Reducing the height of the prominence of the worm cutter leads to an increase in the required length of interaction in the steps of the cutter in the process of forming the active profile of the gear tooth. If the graphic run-in does not take into account the actual length of the interaction between the cutter and the workpiece, then the risk of the undercut of the tooth stem increases with decreasing height of the prominence. A diagram of the possible formation of undercutting of the tooth shaft and recommendations preventing its occurrence as a result of the implementation of graphic two-dimensional helical gears are given.
The lever rounding mechanisms
Authors: Kuznetsov S A
Published: January 2020

Mechanisms with complex movement of a curved executive organ rounding around a fixed set line, in the simplest case – direct line or circular arc – can be combined with guiding mechanisms in the analysis and synthesis tasks, if one assumes the center of curvature of the generator of the executive organ to be a guiding point. Moreover, the length of the rounding segment and the parameters of deviation can be also defined through the parameters of the guiding mechanism, whereby sliding in a reciprocal rounding depends on the generator’s curve radius. Unlike the less applied guiding mechanisms lever rounding mechanisms can find a broad application as executive organs in pressure-shaping machines (e.g. forging, molding, cutting, chipping, clamping and compacting), stepping and finned-type propelling devices and other unique mechanisms with a common feature of indifference of the structure and integration of qualities that are non-compatible at a simple movement of an executive organ.
Justification of the structure and analysis of functioning of the device for tensioning prestressing strands
Authors: Kutlubaev I M , Matsko E Yu , Samigullin V A
Published: January 2020

The problem of creating a compact device for tensioning prestressing strands used for strengthening the surface of workings in mines is considered. It is proposed to use a lever mechanism with a variable structure for providing movement in several degrees of freedom. The geometrical parameters of the mechanism for obtaining the required displacements and forces are determined. The design of the device allows its use by one executive without involvement of hydraulic or electric drives.
Quantitative evaluations of the effectiveness of vibrating and vibroimpact machines
Authors: Astashev Vladimir , Krupenin Vitaly
Published: January 2020

Using the example of an ultrasonic production machine, the problem of quantitative evaluation of the effectiveness of a vibrating machine is considered. Along with the classical approach, a more convenient and informative approach for vibrating and vibroimpact machines is considered, which is called a working (practical) approach. This approach is based on quantitative evaluations of the marginal and real utility of a technological process when performing this workload. It is shown that when implementing a resonant tuning of the machine, which provides the maximum working efficiency, the maximum possible efficiency in the classical sense can be equal to 50%.
CAD-system in solving design and inventive problems
Authors: Akhmedyanova Gulnara
Published: January 2020

The paper discusses the issues of user interaction with the CAD system. The system approach requires the study of the third element - the interface. In addition to the classical subsystem of receiving, transforming and transmitting user requests, the interface model includes testing, statistical analysis and recommendation subsystems. The task of the first subsystem includes an assessment of the user's creative potential, the second reveals the user's preferences and the conditions for their use, and finally, the third subsystem should prompt the user that in some cases there are more convenient tools than the ones he prefers. Further, the first subsystem is investigated in more detail. The experiment was conducted on a group of students in the study of the discipline "Fundamentals of engineering creativity" using two types of tasks: spatial imagination and kinematic thinking. It is shown that, as a first approximation, users can be divided into two classes and force the CAD system to compensate for their one-sidedness, by adding creativity when making design decisions in one case and an analyst in another. Thus, on the one hand, the creative potential of its user develops, on the other hand, the user has the right to demand from the CAD system greater adaptability and intelligence in communication.
Object recognition technology for autonomous unmanned control based on stereo data analysis and voxel representation of visible objects
Authors: Kotyuzanskiy L A , Chetverkin N V , Ryzhkova N G
Published: January 2020

The paper represents a description of the object recognition technology on a road using moving stereo pair of cameras in real time. The developed algorithm is characterized by high processing speed and performs reliable detection of arbitrary shape obstacles. Calculation time for one iteration from receiving input images (size 1280 * 480) to detecting obstacles is less than 2 msec for a Geforce GTX 1080T video card.
Basic approaches to the choice of methods of passenger traffic flow analysis
Authors: Kulev A V , Kulev M V , Kuleva N S
Published: January 2020

Analysis of passenger traffic flow is considered to be one the most important stages of planning and construction of the most appropriate route network of public municipal passenger transport. At the same time, a great variety of methods of passenger traffic flow analysis confuses and prevents from a proper choice of the precise methods to conduct a research. The aim of this article is to find and substantiate basic approaches which can help to find a practical set of methods for analysis of passenger traffic flow in particular cities. To achieve this aim the article analyzes basic advantages and disadvantages of each method, their application fields, restrictions which are set by conditions of different populated areas. The article also suggests research and methodological approach to finding the most appropriate methods of passenger traffic flow analysis.
The Influence of Selective Laser Melting Process Parameters on the Structure and Properties of Products Made from Metal Powders of Domestic Manufacture
Authors: Tarasova T , Filatova A
Published: January 2020

Rational selective laser melting modes have been established for the manufacture of parts from domestic powder of steel grade 20H13. The properties of PR20H13 powder have been studied using the methods of granulometric analysis. The physical and mechanical properties of samples manufactured using rational modes of selective melting have been determined.
Determination of quasi-static and residual stresses in the course of the thermoplastic hardening in a boundary layer of the material
Authors: Zhukov V V , Kudinov I V , Kutsev N M , Mikheeva G V , Klebleev R M
Published: January 2020

In order to induce residual compressive stresses in the boundary layer of a steel plate heated to temperature T
0 = 600 °C, a method of jet water cooling with time-varying heat transfer coefficients is considered. By solving the corresponding heat conduction problem, it is shown that the maximum temperature difference between the surface and the center of a 2 mm thick plate is 105 °C. It is observed within 0.02 s since the start of cooling, the time of its complete cooling is equal to 0,32 s. Calculations of temperature stresses using the finite element method showed that temperature tensile stresses occur on the outer surface of the plate. They may reach 26 kg/mm
2 which exceeds the yield strength of this material. As a result of plastic deformation, the thermal tensile stress relieving occurs in the course of cooling of the plate surface layer; when it is completely cooled, the residual compressive stresses 21.8kg/mm
2. (on the surface of the plate) are induced in this layer (0,25 mm depth).
Digital equipment twin as the basis for the consumer in digital production
Authors: Shatagin Dmitrii , Kuz’mishina Anastasiya , Kolchin Pavel
Published: January 2020

A number of neural network models is presented when developing an aggregated digital twin of equipment as a cyber-physical system. Considered in detail are the twins of machining accuracy, chip formation and tool wear, on the basis of which systems for stabilizing the chip forming process during cutting and diagnostics of cutting tool wear are proposed.
Generation the efficient measuring instruments kit in the computer – aided preproduction planning’s system for multiproduct machine manufactory
Authors: Reshetnikova E , Bochkarev P , Nazaryev A
Published: January 2020

Today it is necessary to change the existing nature of the organization of production in connection with the current trend of transition to the intellectualization of technological preparation of production. Therefore, the actual and fundamentally new today is the creation of a system that will allow you to plan the production process in an automated mode. It is possible to implement on the basis of the development of many variants of technological processes of mechanical processing of the manufactured products. To choose the optimal technological process from the developed, for the current production situation it is necessary to apply a set of control and measuring procedures proposed by the authors. From the subtasks of the complex of control and measuring procedures in One automated system of design of technological processes of machining is the formation of a rational set of measuring instruments, and the solution of this problem is a prospect for the introduction of digitalization of production.
Computer simulation of kinematics of parallel mechanisms
Authors: Mkrtychev Oleg , Kartygin Aleksandr , Cherbachi Iuliia
Published: January 2020

The paper deals with the kinematic analysis of a planar parallel mechanism. The use of parallel mechanisms makes the tasks of controlling the arms on the basis of these mechanisms difficult, since the solutions of the problems of kinematics and the dynamics of mechanisms are complicated. This leads to more complex control systems for such machines. Therefore, it becomes important to develop appropriate templates for solving certain problems of kinematics and dynamics for certain types of parallel mechanisms. In this paper, a planar parallel mechanism in the form of a tripod with three rotational pairs in each leg is considered.
Analysis of granular materials vibrorheology of a railway sanding system
Authors: Konovalov P Y , Bulavin Y P , Volkov I V
Published: January 2020

In this research work, after allowing the experiment to run, we proved the possibility to dose sand in the sand feeding system with the effect of vibratory displacement. We set the disturbing frequency and amplitude, at which the maximum system performance is achieved. The sand consumption curves were obtained depending on the oscillation frequency, pulse shape, and tilt angle. A model proposed to describe the effect of vibrodisplacement in a sand feeding system. It was established that disturbances cause sand oscillations at multitude frequencies, coinciding with which resonance phenomena occur. In practice, it means the increase in consumption.
Production of the steel casting with improved dimensional and geometrical accuracy using complex models
Authors: Zhilin S G , Komarov O N , Bogdanova N A
Published: January 2020

Modern conditions of functioning of mechanical-engineering enterprises are determined by the need to develop and to use the technologies for casting products manufacturing with minimal costs for processing. Such requirements are met by the technology of precise casting manufacturing made by complex models. There have been developed technological variants of forming of complex casting models based on the pressing of powder made from the wax-like composition on a metal or aluminothermic unit with subsequent creating of the single-piece ceramic shell. The use of such technological solutions allows to minimize the processing of cast products, to obtain bimetallic castings with high dimensional and geometric accuracy, and realizes the possibility to use the waste of metallurgy (scale and metal chips).
Study of the use of microwave radiation for heating process fluids in a vehicle
Authors: Anisimov I A , Gorbunova A D , Tishin M M
Published: January 2020

The predominance of a cold climate in the territory of the Russian Federation causes the prevalence of low-temperature conditions during the operation of vehicles, which cause a decrease in the reliability of the engine start-up and an increase in its warm-up time. At the present time, changing the operating modes of the engine fuel system, the introduction of additives to improve the quality of fuel, as well as the use of various types of heaters, one of which is the heating of process fluids with microwave radiation are ways to solve these problems. The use of microwave radiation for heating liquids is considered in the field of railway and pipeline transport, but is not well understood in road transport. Earlier studies have allowed to establish the change in physic and chemical properties in the processing of fuel microwave radiation. The purpose of this article is to study the effect of the use of microwave-treated fuels on the quality of engine start-up and warm-up under low temperature conditions.
Experimental and numerical determination of the barrier layer effect in the composite on the crack propagation
Authors: Kuznetsov Aleksei , Kamantsev Ivan
Published: January 2020

Cyclic crack resistance tests of samples from a seven-layer metallic material obtained by the method of hot rolling were carried out. Identified features of fatigue cracks propagation. Mathematical finite element models describe the stress state at various stages of the experiment are constructed. The features of a finite thickness barrier layer effect in modeling the fatigue crack behavior are revealed.
Contact characteristics of a sphere with a layered elastic half-space
Authors: Ogar P M , Kozhevnikov A S , Kushnarev V S
Published: January 2020

On the basis of a simplified rigid model of a layered elastic body, an engineering technique for determining the parameters of a contact is proposed for the introduction of a spherical indenter into it. The model is based on the dependence of the displacement of the points of the half-space along the axis of symmetry on the magnitude of the applied distributed load. The reduced elasticity modulus and the Poisson's ratio are determined depending on the elastic properties of the base and coating materials, the thickness of the coating and the radius of the contact area. Expressions are given for determining the parameters of a contact when a spherical indenter is introduced into a layered body. The obtained results are compared with the exact solution of the spatial axisymmetric problem for describing the stress-strain state in an elastic layer when a spherical indenter is introduced into it, using the Fourier-Bessel integral transformation method. An analysis of the comparison of the results obtained with the results of exact solutions makes it possible to recommend the proposed engineering method for practical use.
Development and Research of Technological Equipment that Implements Dynamic Control of Process of Additive Fabrication of Parts of Complex Spatial Shapes Based on Mechanisms with a Hybrid Layout
Authors: Grechukhin A , Kuts V , Oleshitskiy A
Published: January 2020

The article is devoted to the study of the accuracy of fabrication of the surface layer of engineering products by additive methods. The analysis of the advantages and disadvantages of technology for layer-by-layer synthesis of products took place. It was revealed that with additive fabrication, the accuracy characteristics of the surface layer are significantly different from the characteristics of the surface layer of products obtained by traditional methods. The analysis of domestic and foreign works on the topic of research allowed to reveal that in order to increase the accuracy characteristics of products obtained by additive methods, it was necessary to provide dynamic control of the spatial orientation of the final link of the fabrication system of the additive installation in the process of fabrication. To control the spatial orientation of the working body of additive equipment, the use of mechanisms with a hybrid layout was proposed. The problem of parametric synthesis of a mechanism with a hybrid layout has been solved, which allows to create a space of design parameters that provide, at the early stages of design, the required formative capabilities of the mechanism for additive fabrication with a hybrid layout.
Rheological Properties and Microstructure of AlSi10Mg Aluminum Alloy produced by Selective Laser Melting
Authors: Salikhyanov D R , Gladkovskii S V , Avraamov Yu A , Volkov V P , Veselova V E
Published: January 2020

The present study is focused on rheological properties of AlSi10Mg aluminium alloy produced by selective laser melting (SLM) at temperatures of hot deformation with the aim to investigate the dependence of strain resistance on temperature, strain rate and strain degree. As-build cylindrical specimens made of AlSi10Mg aluminium alloy was examined on a cam plastometer in temperature range 20 – 500 °C, at strain rate ξ equal to 1, 10 s-1 up to strain degree e equal to 1.2. The paper presents results of study of initial microstructure, microhardness measurement and flow curves of AlSi10Mg alloy produced by SLM. The flow curves of AlSi10Mg alloy produced by SLM can be used in the computer simulation and development of new manufacturing methods of the metallic parts by additive technologies with the use of deformation post-treatment.
The dynamical condition of the vibration machine: nodes of oscillations, flexural centers, connectivity parameters
Authors: Eliseev S V , Kargapoltsev S K , Kuznetsov N K , Bolshakov R S
Published: January 2020

Methodological foundations of structural mathematical modeling are being developed in the application to the problems of forming dynamic states of the working members of technological vibration machines. The purpose of the study is to develop a method of constructing mathematical models to assess the dynamic states of the working members of vibration machines under the conditions of changing the location of application of disturbing influences. Structural mathematical models are used in the form of structural diagrams of the dynamically equivalent automatic control systems. The article shows the possibilities of estimating and forming dynamic states or the distribution of oscillation amplitudes of the working members based on the use of the transfer functions of the system, in particular, the transfer functions of interpartial constraints. A number of concepts have been introduced that reflect the peculiarities of possible relations between the movement parameters of the points of the working member and the parameters of the ratio of exciting force factors. It is shown that the position of oscillation nodes and other characteristic features of dynamic states can be corrected and formed by changing the values of the coefficients of connectivity of movements between the coordinates of points, as well as between the parameters of jointly acting vibration excitations. Analytical relations have been obtained that determine the conditions for the emergence and implementation of various dynamic modes associated with the consideration of vibration nodes and flexural centers.
Automation of selection of technological bases as a basis for formalization of technological design
Authors: Glinskaya N Y
Published: January 2020

The article is devoted to solving the automated selection of technological base. There is an attempt to present the mathematical solving the problem as a problem of depriving the item of six degrees of freedom and defining the surfaces set, which can be processed at one installation. The rules of base selection from the point of view of engineering technology are propounded to introduce as limitations at the later stages of solving the problem. The article makes a conclusion about the possibility of the further complication of the algorithm and raising the quality of solving the problem.
Technology of reconditioning with hardening of working elements of construction and road machines by composite coatings
Authors: Kolomeichenko A V , Titov N V , Baranov Y N
Published: January 2020

The article gives the description of the developed technology of increasing wear resistance of working elements of national and foreign constructional and road machines by composite coatings, obtained on working elements cutting surfaces applying Carbo Vibro Arc Hardening method (CVAH). The technology includes the following basic operations: cleaning and fault detection of the working element, removal of the worn cutting element, compensating element production, its sharpening and welding, preparation of metal and ceramic paste for Carbo Vibro Arc Hardening method (CVAH) and its application, Carbo Vibro Arc Hardening method (CVAH) of the harden cutting surface of the working element. When hardening new working elements technological process operations connected with production and welding the compensating element is not performed. According to the carried out results the rational composition and component concentration of the paste that provides significant increase of working elements wear resistance.
Integration of descriptions of conceptual model representations at automation of design tasks
Authors: Novoselova O V , Sidorov A S
Published: January 2020

This paper investigates integrating model representation descriptions in the form of charts and specifications at the stage of automated systems conceptual modeling, developed in order to solve design tasks on the methodology for automating intellectual labor (MAIL). In the process of creating the applied automated system on the basis of MAIL there were developed the following model representations of design tasks: initial, conceptual, infological and datalogical. The description of conceptual model representation includes the following forms (specifications) and charts: for a static component - F1 and F2, the chart of conceptual structure; for a dynamic component - F3 and F4, the chart depicting a system of subject dependences; F6 and the matrix chart showing the model as a whole including static and dynamic components coordination. There was investigated the process creating charts and specifications as a basis of the method and technique to integrate descriptions of dynamic and static components for the problems solving carried out at designing mechanical engineering objects. Integration of models is performed separately for each component of model on each type of description. Integrating descriptions in the form of charts and specifications for dynamic components of conceptual model representations is given in this paper.
Modeling and study of the stress-strain state of the modular turning tools using numerical finite element method
Authors: Lukina S V , Krutyakova M V , Ivannikov S N
Published: January 2020

The paper studies a comparative evaluation method for the modular cutting tools stress-strain state under the cutting forces loading with the help of the finite element numerical method. The method allows forecasting the modular cutting tool the position of the tip of the cutting edge with identification of the confidence bounds for its exploitation in compliance with its intended use and reference operating conditions. The conducted modeling describes the modular cutting tool structure as a ranked set of structural components, such as the frame, cutting insert, shim, etc., oriented towards a certain direction with some surfaces being contiguous and thus making contact interactions. The research examined different tool structural component layout options, including those equipped/not equipped with a shim, having a radial/tangential location type of cutting components. Regression models were obtained for calculating the total displacements of tips the cutting edges of the cutting inserts, as well as maximum equivalent stresses in the cutting inserts, depending on the attachment and cutting forces for various clamping patterns and positioning cutting plates in the form of linear polynomials. The authors developed recommendations for the most efficient application of the modular cutting tool structural component layout options under specific production conditions.
Automation of operation procedure of a wheeled mobile machine
Authors: Baranov A S , Pavlyuk A S , Poddubny V I
Published: January 2020

The article discusses the theoretical foundations of automation of operation procedure of a wheeled mobile machine. The basis of equations system describing the performance “lane change” maneuver is a combination of the main types of maneuvers: correction of sidewise displacement and angularity deviation, as well as trajectory curvature. The equations system describes the entire process of executing “lane change” maneuver, taking into account peculiarities of entering and recovering from the maneuver. On the basis of the proposed equations system, the recommended form of the control action is presented when performing the “lane change” maneuver. The proposed algorithm for the control activity implementation was tested in the process of field-control tests’ performance of the К- 701wheel-tyre tractor with the hinged frame. The results of field-control tests show that the proposed control model can be used when carrying out certain types of field-control tests that do not require the significant precision of performance.
The study of the profile passability all-terrain vehicles with a wheel formula 6x6 full mass 0.3, 0.75, 2 tons
Authors: Papunin A V , Belyakov V V , Makarov V S
Published: January 2020

The article deals with the issue of overcoming destructible profile obstacles in all-terrain vehicles with a wheel formula of 6x6 with full masses of 0.3, 0.75, 2 tons. It is shown that the most difficult case is overcoming destructible moats. Dependencies are given for calculating the critical value of a pit to be overcome. The calculation method is given. The objects of study are shown - ATVs developed at NSTU named after R.E.Alekseev. The calculations for the four types of soils.
Pulsed micro-melting method for single-cristal turbine blade reduction technology
Authors: Tsareva I N , Berdnik O B , Kirikov S V , Maximov M V
Published: January 2020

The paper is devoted to the study of the composition, microstructure and mechanical properties of heat-resistant single crystalline intermetallic alloy. In order to develop a resource-saving technology, the method of pulsed micro- surfacing has been tested, designed to restore the geometric dimensions of cooled gas turbine blades.
Investigating the process of rock destruction by an indenter in a well through the theory of contact problems
Authors: Korneyev V A , Korneyev P A , Koynov R S
Published: January 2020

The article describes the results of the study of the process of destruction of rocks by contact. The indentation of the indenter into the well wall was considered. A body with a cylindrical surface was used as an indenter. The authors of the article applied the theory of contact interaction of G. Hertz. The strength theory was used as a criterion for destruction. K. Mohr. The dependence obtained by the authors was tested using mathematical modeling. The results of mathematical modeling have confirmed the possibility of practical application of the resulting relationship.
Active vibration isolation of nanotechnology equipment
Authors: Mikhailov V P , Bazinenkov A M , Kazakov A V
Published: January 2020

The paper is concerned with the results of experimental studies of the parameters of transients during the operation of a high-precision drive based on a magnetorheological (MR) elastomer with a closed control system, which is also an active damper. In this paper, the authors showed the amplitude and frequency characteristics of the damper and vibration-isolating platform in semi-active mode and presented a model of outgassing from the near-surface layer of MR elastomer. The results of studies on the partial composition of gases released from the MR elastomer at the temperature 150°C are given, depending on the pumping time.
Technological audit in the system of tools for assessing the innovative potential of technology transfer
Authors: Savon I , Ukraintsev V , Kanaki V
Published: January 2020

The article deals with issues related to technology transfer. It is substantiated that in order to ensure the sustainable development of the Russian economy, it is necessary to organize the process of technological transfer between the subjects of innovation activity. It was revealed that technological audit is a demanded procedure that allows to give an objective assessment of the level of technological development of an economic entity, identify problems and reserves to increase technological potential.
An approach of developing solution for monitoring the status and parameters of technological equipment for the implementation of Industry 4.0
Authors: Nikishechkin P A , Chervonnova N Yu , Nikich A N
Published: January 2020

The article is devoted to the study of trends in the construction of «smart» industries and the theoretical aspects of developing a system for the implementation of continuous control and monitoring of technological processes in industrial enterprises. The requirements for the developed system, its functionality and basic principles of construction are formulated. The main data blocks that need to be obtained and timely monitored during the technological process, as well as methods for obtaining them, are systematized.
Plasma-electrolytic treatment of magnesium alloy fibers
Authors: Krit B L , Morozova N V , Serov M M , Wu Ruizhi
Published: January 2020

The results of researches of the modifying effect of the Pendant Drop Melt Extraction (PDME) and the Plasma-Electrolytic Treatment (PET) methods for ML10 magnesium alloy are presented. Particularities of PET for fibrous magnesium alloy are studied. Metallography, morphology analysis and corrosion tests are executed. The conclusion that application of the PET and PDME methods for purposeful modifying is capable to significantly expand possibilities of magnesium alloys using was made.
Comparison of corrosion resistance of gas-dynamic coatings, obtained using standard and electroerosive powder material
Authors: Ageev E V , Novikov E P , Novikov A N
Published: January 2020

The paper presents the results of a study and comparison of the corrosion resistance of gas-dynamic coatings, obtained using standard powder material grade A-20-11, and aluminum-containing powder material, obtained by the method of electroerosive dispersion of electrical aluminum wastes in distilled water. The study of the corrosion resistance of gas-dynamic coatings was carried out according to the method of accelerated testing using a multichannel potentiostat-galvanostat "Elins P-20X8". 3,5% NaCl was used as working solution. The ESr-10101 electrode (Ag/AgCl/KCl) was used as a reference electrode, the KCl concentration in the potential-forming half-cell was 4,2mol/dm3. The reference electrode was connected to the working solution via an electrolytic switch (bridge). The area of the investigated surface was 1 cm2. The volume of working solution used for each sample was 1 l. The measurement time was 5 hours. As a result of the corrosion resistance study of gas-dynamic coatings, it was experimentally established that in coatings, obtained using standard powder materials, the electrolyte penetrates into the coating, which contributes to the rapid exfoliation. It was also established that the corrosion resistance of the coating obtained using electroerosive powder materials is 22% higher than the corrosion resistance of the coating obtained using standard powder materials.
Peculiarities of structure and properties of titanium during fragmentation and reversal in a torsion process under high pressure
Authors: Shurygina N A , Glezer A M , Dyakonov D L , Medvedyeva A D , Tomchuk A A
Published: January 2020

Influence of a reverse rotation of the moving striker of a Bridgeman chamber (torsion under high quasi-hydrostatic pressure at room temperature) on the structure and mechanical properties of technically pure titanium (VT 1-0) was studied. It was established that a change in the rotation direction of the moving striker during torsion had a significant effect on the conditions for separating the ω-phase, as well as on the structural characteristics of deformation fragments and dynamically recrystallized grains formed during large plastic deformations. Influence of the deformation method on the internal distortions of structure and on the mechanical properties was analyzed.
Comparison of diagnostic tools for cutting tools for the utilization of aerospace composite materials
Authors: Li Xueyan , Galinovsky A L , Sudnik L V
Published: January 2020

The article discusses the comparison of diagnostics of the cutting tool for utilization of composites of aerospace engineering. The paper presents the results of classical, traditional diagnostic methods and ultra-jet method. The article concludes with the advantages of ultra-jet diagnostics.
The expert system for improving the technological processes of composite manufacturing
Authors: Zalazinsky A G , Shveykin V P , Titov V G
Published: January 2020

An expert system for improving the technological processes of composite manufacturing is presented. The domain of the expert system is the technology of pressure treatment of structurally inhomogeneous materials, including powder materials and composites. The purpose of the expert system is the interpretation of experimental data and the prediction of physical and mechanical properties of blanks and products. The function of the expert system is to issue recommendations for improving the technological processes of manufacturing blanks of non-compact metal raw materials, produced on the basis of predicting the properties and behavior of the object of the study. The problems solved by the expert system are planning natural and computational experiments, statistical processing of experimental data, regression analysis, checking the adequacy of mathematical models, multiparameter optimization of the systems and processes under study.