bluuebunny/crossref_metadata_2025 huggingface dataset:
Macrorelief and chemical composition of a surface of details made of stainless steels after electrochemical polishing in a non-stationary electrolysis mode
Authors: Stavyshenko A S , Chuikov R S , Chuikov S S , Plekhanov V I
Published: January 2020

This paper is dedicated to study of the macrorelief and the chemical composition of the surface of the details made of stainless steel after the electrochemical polishing in the nonstationary electrolysis mode with usage of a scanning electron microscope JEOL JSM-6510A. We presented images of the surface of samples under test and spectrograms of quantity distribution of chemical elements in their near surface layers after a processing in different technological modes (process phases). We made a calculation of sizes of the surface irregularities and an average number of chemical elements distribution in the near surface layers of the samples under test. We presented diagrams of a dependence of the surface irregularities sizes of the samples under test on the technological modes of the processing.
Optimization and optimality of frames with equally stable parts (links)
Authors: Shein A I
Published: January 2020

The problem of optimal design of transport overpass supports has the form of the problem of optimization of multi-storey frame system from the condition of stability. Analysis of the work of individual elements of frame systems in existing design solutions shows that not all parts of the frame are effectively involved in ensuring the overall stability of the structure. In this regard, it is important to solve the problem of optimization of frame elements with equal stability of individual parts. It is important to know the ratio of optimal frames and optimal frames with equally stable links. In an apparatus of forming a mathematical model of the critical state is adopted the method of displacement with the trigonometric functions, the effects of longitudinal forces on the reaction. The condition of the critical state of multi-storey frames, the stiffness matrix of which is the Jacobian matrix, is written by the determinant equation. The General solution of the problem of optimization of multi-storey frames in an analytical, closed form was obtained by the author earlier. For a complete analytical solution of optimization problems for equally stable parts, it is necessary to find solutions to two optimization problems for free frame links and two problems for non-free frame links. By a decision established that, forming the frame of the optimal revostock parts, we obtain a frame equivalent to the optimal non-segmented frame. And, therefore, the position stated by A. F. Smirnov that the most rational of the stability condition of the system will be such, all links (parts) of which have equal stability is true. The frame of the minimum mass with equal parts is optimal from the stability condition.
Theoretical and experimental optimization of vibro-acoustic parameters of MKSM-800 loader
Authors: Taratorkin A I , Taratorkin I A , Trusevich I A
Published: January 2020

This paper presents the results of a theoretical and experimental study of the vibro-acoustic radiation of the mini loader (MKSM-800), and analyzes the variant of reducing the noise level both of the loader on the whole and of its specific structural components. It estimates the vibro-acoustic activity of an internal combustion engine (ICE), including the cooling system, and the left and right side reduction gear. On the basis of the dynamic analysis of the mechanical system structures, the most dangerous forms of oscillations are determined, they contribute to the integral level of acoustic radiation most of all. This waveshape damping is achieved by targeted ribbing of the structural components of the reduction gear, as well as by reducing the vibroactivity of the excitation source by increasing the precision degree in gear manufacturing.
Polymeric materials turning on the base of blanks preliminary twisting
Authors: Erenkov Oleg , Anikeeva Olesya , Ivakhnenko Alexander
Published: January 2020

The theoretical and experimental research results of the new method for polymeric materials turning are presented in the article. The workpiece material preliminary deformation by twisting is the distinctive feature of the developed method. It is theoretically shown that the maximum stresses value during twisting is formed on the workpiece surface layer. It has been experimentally proved that the workpiece deformation by twisting leads to changes in the stress-strain state of the polymer chain. The workpieces pre-deformation by twisting allows obtaining the more qualitative surface layer than in case of the traditional turning.
On selection of optimal stop position and spatial orientation of mobile robot
Authors: Liberman Y L , Letnev K Y
Published: January 2020

The paper analyses the problem of finding optimal coordinates of a mobile robot equipped with a manipulator. An optimization criterion is proposed and validated, and a method for calculating most rational coordinates of the robot is described.
Developing a digital control system for the main drives of an open-pit excavator as a major field of increasing the efficiency of excavator operation
Authors: Lukashuk O A , Komissarov A P , Lagunova Yu A
Published: January 2020

The specifics of rock excavation using a front-shovel operational equipment are addressed in the paper. Excavation, carried out by actuating (thrusting and lifting) mechanisms of an excavator, is shown to form a leverage mechanism which consists of operational equipment elements and connects the main actuating mechanisms with the bucket, thus forming a common transmission mechanism for their drives. Mechanical energy of the main drives is converted to energy-force parameters realized at the cutting edge of the bucket (its teeth) in agreement with kinematic properties of the mechanism. Expressions for transfer functions of the leverage, which define relations between the energy-force parameters at the cutting edge and operating parameters (velocities of operating motions), were obtained. A flow chart for calculating the operating parameters was developed. A digital control system on its basis would allow to increase the excavating efficiency.
Modelling of correlation of actual and program feeds in the automatic cycle
Authors: Akintseva A V , Prokhorov A V , Omelchenko S V
Published: January 2020

The article presents a model for calculating the current values of the actual radial feed in the internal grinding process controlled in an automatic cycle on a CNC machine. The model establishes the correlation of actual and program feeds with cutting forces, elastic deformation of the technological system, cutting modes, geometrical parameters of the contact area between the wheel and the workpiece, wheel characteristics and other technological parameters and conditions of processing in a wide range of their variation. The obtained model is used for predicting radii changes of the machined hole surface starting from the workpiece to the final size for a given automatic cycle and various technological conditions of the internal grinding operation. The model described in this article is the basis for the development of methodology for multiparameter optimization of grinding cycles in a multidimensional space of control parameters.
Quadrature finite element method for the problem on eigenvibrations of a bar with elastic support
Authors: Korosteleva D M , Solov’ev P S , Solov’ev S I
Published: January 2020

The differential eigenvalue problem describing eigenvibrations of a bar with fixed ends and with elastic support at an interior point is investigated. This problem has an increasing sequence of positive simple eigenvalues with limit point at infinity. To the sequence of eigenvalues, there corresponds a complete orthonormal system of eigenfunctions. We formulate a limit differential eigenvalue problem and prove the convergence of the eigenvalues and eigenfunctions of the initial problem to the corresponding eigenvalues and eigenfunctions of the limit problem as stiffness coefficient tending to infinity. The original differential eigenvalue problem is approximated by the quadrature finite element method of arbitrary order on a uniform grid. Error estimates for approximate eigenvalues and eigenfunctions are established. Theoretical results are illustrated by numerical experiments for a model problem. Investigations of this paper can be generalized for the cases of more complicated and important problems on eigenvibrations of beams, plates and shells with elastic support.
Analysis viscoelastic properties of the composite leaf spring
Authors: Belyaeva A A , Evseev K B
Published: January 2020

In modern conditions of market competition leading manufacturers of wheeled vehicles and their components actively introduce new technologies in the process of production of their products. One of the directions of modern automobile industry development is application of new materials, which include polymeric composite materials (PCM). In the given research the analysis of elastic properties of a leaf spring made of application of polymeric composite materials is carried out. In the study the analysis of the construction by finite element (FE) method and the analysis of the results of bench tests are carried out. To carry out the research, the appropriate design was made, the methods of testing of the elastic element under consideration were developed, the composite spring was mathematically simulated for the purpose of its verification and the possibility of its further use. As a result of the work performed, the maximum deflections of the leaf spring under consideration were established when loading the corresponding load in the suspension system of GAZ-2752 "Sobol" car. The executed bench experiment has established he maximum deflection of a spring. Similar values were obtained by the FE-method. These results show that it is impossible to use the leaf spring in the suspension system of a GAZ-2752 car.
Simulation of movement of a high-speed stage of a monorail rocket train along an elastic guide, taking into account wave processes in it and conditions at the sliding contact
Authors: Erofeev V I , Gerasimov S I , Odzerikho I A
Published: January 2020

The processes of changing the mechanical characteristics of the material, intensive plastic deformations and the entrainment of material from the working surfaces are studied at high-speed sliding of loads along the rail guides of the rocket track.
Influence of body size on rebound height after shock interaction
Authors: Lapshin V , Kobzov D
Published: January 2020

The mechanorheological model was used to study the relationship of the body size and the rebound height after impact interaction. With an increase in the diameter of a spherical body, the body mass and the radius of surface curvature increase. Therefore, effects of both factors and each separate factor were evaluated. The study identified that with a simultaneous increase in the body mass and the radius of curvature, the rebound height decreases. An increase in the body mass has a slight effect on the rebound height. For the elastic plastic model, an increase in the body mass causes an increase in plastic deformations and a decrease in the rebound height. For the viscoelastic model, an increase in the body mass causes a slight increase in the rebound height. With an increase in the radius f curvature, the rebound height decreases. An increase in model plasticity decreases the rebound height at various values of viscoelastic plastic parameters of the model due to the fact that a lot of impact energy is spent on plastic deformations rather than on the elastic rebound of the body. The research results showed that the rebound height depends on the size of the impacting body.
Increasing the durability of grinding wheels by reducing the wear of its limiting sections of the profile
Authors: Salov P M , Salova D P , Vinogradova T G
Published: January 2020

Due to the edge wear and natural running-in, abrasive wheels do not have equal resistance to the profile. After flattening, the most weakened grains are removed from the wheel. Further, the wheel wears out in accordance with the law of natural running-on. The work on the basis of a systematic approach solved two main tasks: to analyze the relationship of resistance to self-sharpening; to develop and implement measures to improve the resistance of areas of the wheel, exposed for any reason the greatest wear or blunt.The paper analyzes the wear of the wheels during grinding and flattening. The finite element method is used to estimate the thermal stress in the ruling elements and grains. Not only a high probability of the formation of thermal microcracks was established, but also the destruction of grains at the moment of their exit from the contact zone. Edging device for flattening has been designed. A new scheme of forming a rectangular profile is proposed. New conditions for the grinding of the corner wheels were proposed.
Technological residual stresses during grinding of high-strength steels
Authors: Salov P M , Salova D P , Shalunov E P
Published: January 2020

The quality of parts made of high-strength steels is largely determined by the ability to perceive alternating cyclic loads. This ability depends on the sign and the level of technological stresses generated largely in the final operations. Residual stresses are the result of the combined effect of stresses from forces, temperatures, and structural transformations. A significant part of specialists in this field believe that the dominant factor in their formation is heat. Thermoplastic deformations and phase-structural transformations occur under the influence of cutting heat. There are tensile stresses that reduce the cyclic strength of parts. The aim of the work is to develop recommendations for providing on the surfaces of parts made of high-strength steels favorable residual stresses. For its implementation, a deep study of the known mechanisms of the formation of residual stresses is carried out, the process of chip formation during cutting with a cutter with a negative front angle is considered in depth, the role of the modified temperature, smoothing effect is revealed.
The instrument geometrical parameters calculation theory for the pressure processing of the round-rolled surface
Authors: Antimonov A M , Pushkareva N B
Published: January 2020

The problem of round-rolled surface products improving quality by reducing roughness and waviness is solved. Traditionally, grinding is used to improve the surface quality, but at the same time new defects appear in the form of cracks, tinge colours and the abrasive particles infiltration into the surface layer. Surface pressure processing instead of grinding is not associated with such defects, therefore, it is proposed to use a transverse rolling. Rolling rational profile for transverse rolling of round-rolled surface was theoretically determined. Analytical dependences were obtained for rolls in cage with support rings calibration calculations. Such calibration use ensures uniform deterioration of rolls and rings bearing surfaces, as well as the rolls balance with their one-sided load during rolling. A parametric analysis of the deformation conditions effect on the rolls geometry was performed. The conditions when rolls profile can be limited to a circle or a straight line were considered. The obtained results were used in rolls profiling for drawing the rolling surface in laboratory and industrial conditions.
Nanomaterials and nanotechnology: prospects for technological re-equipment in the power engineering industry
Authors: Inshakova E , Inshakova A
Published: January 2020

The authors substantiate the potential of nanotechnology in the technology modernization of the power engineering industry (PEI) enterprises aimed at achieving production efficiency growth. The key factors encouraging the PEI companies to undertake technological re-equipment (stable and rapid nanotechnology market growth, expanding nanomaterials application and reducing costs along with the increase in the global energy consumption) are revealed. The authors state that the opportunities for the widespread use of the new nanotechnologies and nanomaterials in the PEI are directly related to the formation of regulatory and technical support for the life cycle of nanotechnology products. Within that framework, formation of the global and Russian system of standardization and certification in nanotechnology field is exercised. The factors restraining the process of the PEI companies’ technology modernization (the lack of funds, delay of standardization, metrology and certification in relation to the pace of nanotechnology development, insufficient companies’ interest) are disclosed. Prospective algorithm of technological re-equipment of the PEI companies is suggested.
Analysis of forced vibrations of conveyor belts
Authors: Kozhushko G G , Yampolsky D A , Lukashuk M D
Published: January 2020

The paper presents the study of forced transverse vibrations of conveyor belts. Those are caused by rollers having an eccentricity, which originates either from production errors or transported material sticking to bearing rollers of the lower conveyor branch. The dynamic behavior of the belt was analyzed by solving a boundary problem described by differential equations expressed in partial derivatives and corresponding boundary conditions. The solution helped to determine modal parameters of the system – eigenfrequencies and eigenforms of vibrations, which, in their main modes, would be the basis of practical recommendations for selecting such parameters of conveyor systems and their operational modes which could prevent the system from getting into a resonance state.
Multidimensional monitoring of a streaming process
Authors: Pishchukhin Aleksandr
Published: January 2020

The work is devoted to a multidimensional approach to the presentation of monitoring information about the streaming technological process, which is accompanied by a rather strict ratio of the durations of each of the operations. Usually these operations are quite a lot, and a small loss of time on one operation can be compensated for subsequent ones, the control of the duration of each of the operations is not very informative. In this case, it becomes relevant to consider the state of the technological process in a multidimensional space, the coordinates of the imaging points in which are the duration of each operation at a given time. Since the ratio of the durations of operations with each other must be fairly strictly conserved, it sets in a multidimensional space a ray of temporary operational norms. On the other hand, the sum of all operations determines the performance and so that it always lies on the hyperplane, for coordinates the scaling factors are determined. This hyperplane is called the equal contribution hyperplane. The difference between a real technological process and a normal one (deviation from the norm beam) can be estimated by two parameters determined in the plane of equal contributions: the distance of the imaging point from the intersection point of the norm beam and the plane of equal contributions and the angle of rotation of the beam to the imaging point relative to the reference operation of the technological process.
Calculation of force and energy parameters of fracture in the area of the front of the crack in the shell of the reactor of coke chambers
Authors: Zhernakov V S , Budilov I N , Koneva K V
Published: January 2020

This paper presents a three-dimensional elastic calculation of the stress-strain state of the reactor and the force and energy parameters fracture for an elliptical crack located in a cylindrical shell. It is found that for an elliptic crack, the force and energy parameters of the fracture change nonlinearly along the crack front. The qualitative and quantitative relations for the stress intensity factors (SIF and J-integral along the crack front taking into account its size, the shape of the front and the angle of inclination) are obtained.
Ground vehicles hydraulic system pneumatic hydraulic valve
Authors: Burlachenko O V , Fomenko N V , Lyashenko A A
Published: January 2020

Hydraulic systems equipped with working bodies hydraulic drives are widely used in ground vehicles. The researches show that one of the modern hydraulic drives problems is the destruction of flexible high-pressure hoses and the unauthorized pressure fluid discharge into the atmosphere. The analysis of the machines hydraulic drive protecting existing methods shows that the urgency of their improvement problem remains, since, for most of them the loss is between 3 and 10 l when operating, for example, pneumatic electric protection system - 6 … 8 l., float protection system is up to 10 l. As can be seen from the analysis, after the protection system locking device actuation leakage of the pressure fluid is preserved. The hydromechanical hydraulic drive protection system is the closest in technical essence and the achieved technical result. However, it also has a disadvantage, for example, when the locking device is actuated a hydraulic shock occurs, and leads to an oscillatory process of the plunger, an increase in the overlap time of the damaged hydraulic line, a decrease in the speed of the locking device and its operational reliability. To eliminate these shortcomings, the authors propose a new technical solution.
Semi-Markov Model of a Technical System with Maintenance and Time Reserve
Authors: Glech Sergey G , Sidorov Stanislav M , Nikitin Mikhail M
Published: January 2020

Ensuring high reliability of technical systems requires the construction of adequate mathematical models of their functioning, taking into account not only individual factors that increase reliability (maintenance, redundancy, control, etc.), but also their combinations. In this paper, a semi-Markov model of a technical system with calendar maintenance and time reserve is constructed. For an approximate determination of the stationary characteristics of the reliability of the system, the phase merging scheme algorithm is used. The effect of the time reserve on the reliability characteristics of the system under consideration is analyzed.
Antifriction powder bronzes with mechanically alloyed copper-based granules
Authors: Smirnov V M , Shalunov E P
Published: January 2020

New antifriction composite materials of matrix-filled type based on tin bronze powder for heavily loaded elements of friction units are presented. As their load-bearing structural component heat – and wear-resistant fillers in the form of copper-based granules with the initial composition Cu-5% Al-2% C-2% MoS2 are used, obtained in the course of the reactionary mechanical alloying of copper powder in the air of attritor by aluminum and lubricating additives in the form of graphite and molybdenum disulfide. Dynamically thermostable particles in the form of γ–Al2O3 oxides of nanodispersed level, mechanochemically synthesized in the attritor, are evenly distributed in copper-based cold-hardened granules and provide them with a high temperature of softening - up to 08…0.9 of the melting temperature of copper. The addition of such granules to powder bronze with 5 wt% tin allowed to obtain antifriction composite materials, which in terms of mechanical and tribotechnical properties significantly exceed the standard antifriction tin and aluminum bronzes and, in particular, bronze EN CuSn8 and EN CuAl10Ni5Fe4.
Nonlinear strain waves in a metamaterial defined a mass-to-mass chain
Authors: Erofeev Vladimir , Kolesov Daniil , Malkhanov Alexey
Published: January 2020

A mathematical model is proposed that is a chain of oscillators consisting of nonlinear elastic elements and masses, each of which contains an internal nonlinear oscillator. Such a model describes a mass-to-mass acoustic metamaterial class. It is shown that the obtained system of equations can be reduced to the nonlinear evolutionary equation of Benjamin-Bona-Mahoni, showing that spatially localized nonlinear deformation waves (solitons) can form in the metamaterial under dynamic action on it.
Numerical simulation in additive manufacturing of gas turbine parts
Authors: Inozemtsev Aleksandr , Smetannıkov Oleg , Dubrovskaia Aleksandra , Dongauzer Konstantin , Bushuev Leonid
Published: January 2020

The article describes the development of mathematical models and user environment in the APD language which are based on the finite element system solver and allow for the SLM physical process numeric modelling with the required accuracy. The main task is to evaluate the final shrinkage and residual strength of the blanks of gas turbine parts for optimizing the technological process of production. The activities on introducing pre-distortions into the part geometry were performed to compensate for thermal deformation during the growth process; the part with pre-distortion was produced and controlled.
Ultrasonic influence on the quality formation of surface layer when cutting thread
Authors: Golovkin Valery , Batishcheva Oksana , Papshev Valery
Published: January 2020

The paper deals with the issues of the quality assurance of thread surface layer during mechanical processing using forced ultrasonic vibrations. The results of the conducted research on the ultrasonic vibrations effect on the formation of thread surface layer quality characteristics are presented. Roughness, strain hardening and residual stresses are considered as the main characteristics.
The introduction of a mixed system of maintenance and repair of metal-cutting equipment
Authors: Gamberg A E , Ershova I V , Cherepanova E V
Published: January 2020

The article provides a comparative analysis of the Russian and foreign systems for the maintenance and repair of metal-cutting equipment. The limitations of the application of systems of universal maintenance of equipment, scheduled preventive maintenance and repair by state are analyzed. The influence of the age of the equipment and the percentage of the repair plan on the amount of emergency shutdowns is shown. The main stages of the introduction of mixed service and repair systems are highlighted. Criteria for classifying equipment groups are proposed for the selection of repair and maintenance systems. Examples of typical diagnostic signs of malfunctions of metal-cutting equipment and statistical time of emergency shutdown after their detection are given. The recommendations on planning the need for spare parts and organization of repair work are given.
Factors of successful diversification for machine-building enterprises
Authors: Murukina A D , Tipner L M , Kalinina N E
Published: January 2020

The relevance of the study is due to the need to diversify production in order to increase competitiveness and strengthen the economic sustainability of enterprises. Increasing the output of high-tech civil and dual-use products by enterprises of the military-industrial complex as part of the conversion is complicated by the lack of enterprises work experience in the market. Conversion of defense industry enterprises is an important and promising task, the solution of which is connected with the future of defense industry enterprises, the development of import substitution, the expansion of high-tech exports. The purpose of the study is to analyze the world experience of conversion, to study existing approaches to solving conversion implementation problems, creating a system of conversion success factors, monitoring the effect of external and internal conversion implementation factors, identifying actual problems of this process. The author's approach to solving conversion problems consists of identifying external and internal conversion success factors and combining them into a single system for the interaction between the state and defense enterprises. The study of the implementation of the indicated factors showed the degree of their development, as well as the directions that will contribute to the development of diversification.
Operation of high-technology product development based on functions and value
Authors: Prilytskaya M A , Murukina A D , Podoliak O O
Published: January 2020

The sector of military-industrial enterprises was the most state supported in recent years. It is obvious that success of strategic initiatives is defined by efficiency of the enterprises diversification and can provide bringing domestic products to the world market with the highest level of competitiveness. Military-industrial enterprises (as drivers of the economy development) have to provide the implementation of several national programs and projects: industry development, diversification, import substitution of hi-technology products, production of the export-oriented products, increase of labor productivity, digital economy. That’s why it is important to find effective solutions, which can provide achievement of several tasks. At the same time, effective development of civilian products is interfered by a number of organizational and economic conditions. For definition of the unique set of functionality and characteristics of a product on the basis of the unique customer needs (for competitive hi-tech export-oriented civilian products), the FSA was created. This model allows to provide the civilian products manufacture development due to paramount and constant orientation to requirements of the market and clients, and the production process improvements for cost reduction without damage to its quality.
Development of a model for the study of methods of intensification of heat exchange processes
Authors: Faizrahmanov Ilshat , Sabanaev Ildar
Published: January 2020

The research results of the convective heat transfer process and determination of the heat transfer coefficient in order to select effective ways to increase its intensity are presented. A physical model for obtaining experimental data is designed. It is shown that the mathematical description of the process belongs to the class of inverse problems of heat conductivity. The article proposes a solution algorithm based on the use of numerical methods. A computer model is developed that allows to obtain a solution in a real time mode. It includes a module for reading data coming to computer ports from sensors, a calculation module, a visualization and saving results module, and tools for user convenience. It is shown that the obtained solution can be used to study ways to increase intensity of heat transfer when designing equipment in chemical engineering and machine building.
Collecting diagnostic operational data from CNC machines during operation process
Authors: Martinov G M , Pushkov R L , Evstafieva S V
Published: January 2020

The article deals with issues related to obtaining operational data from process equipment and machine parameters of the CNC system in order to monitor the correct use of equipment, and to comply with the regulations for its operation [1]. Data is collected using data acquisition modules that can work with equipment using specific protocols. To store and process the received data using its own REST-server. The obtained data at the request of the user can be configured by selecting from a common array of data and designating them.
Application problems of process capability evaluation methods in modern quality assurance systems
Authors: Egorov Sergey , Kapitanov Alexey , Kozlova Aleksandra
Published: January 2020

The article discusses the most important issues for industrial quality assurance systems, such as calculation of capability and performance indices. Techniques being currently used at most enterprises, their advantages and disadvantages are assessed. Modern methods for calculating capability indices are proposed and a conclusion is made about the need to streamline the concepts of capability and performance. A conclusion is made about the need to use the proposed technique, which main difference is the ability to evaluate processes by the real distribution law, as well as about the risk of using EXCEL tables offered by many developers of quality assurance systems.
Optimization of conditions for small-rigid prismatic workpieces flat grinding by elastic deformations controlling
Authors: Tyshkevich V N , Nosenko V A , Sarazov A V
Published: January 2020

The authors propose the technique of optimization the conditions for small-rigid prismatic workpieces side surfaces flat grinding that guarantees obtaining the predefined quality requirements of the machined surface while ensuring the maximum process efficiency. The input factors (grinding wheel hardness, depth of grinding, table feed speed and run, etc.) are considered as the grinding process optimization parameters. Mathematical models of the output factors (surface roughness parameter Ra, absence of grinding burns, required flatness tolerance of surface) are used to limit the range of optimization parameters allowable values. The resulted efficiency is an objective function. The optimization of parameters in the range of allowable values is carried out with the view of ensuring the maximum process efficiency. The required flatness admission is provided at the second optimization stage of the workpieces by controlling the elastic deformation extent. The varied parameters at controlling the maximum elastic deformation are cutting forces, the attraction of the magnetic field of the machine table and rigidity of workpiece at a bend. The terms for providing of the required side surface flatness tolerance are determined for workpieces taking into account elastic deformation of the small-rigid workpieces under the magnetic field effect on the machine table and the radial component of the grinding force. Keywords: elastic deformations; small-rigid prismatic workpieces; flat grinding; quality of machined surface; process optimization.
Structural studies of surface-alloyed layers of the Cr-B4C system, formed on Ti-6Al-4V titanium alloy
Authors: Chuchkova L V , Belov A S , Lozkina E A , Khomyakov M N
Published: January 2020

The paper presents studies of the structure of surface-alloyed layers obtained by the method of non-vacuum electron-beam cladding of the Ti-Cr-B4C and Cr-B4C powder mixture systems. Structural analysis allowed to identify the dependence of the initial powder portion on the shape and size of the phases formed. It is noted that the presence of titanium (10 wt. %) in the composition of the surfacing mixture leads to the formation of large primary crystals of titanium carbide and boride. The absence of titanium contributes to the formation of chromium carbide coating and small eutectic particles on the grain boundaries on the surface.
The influence of volumetric electromechanical mandreling on the lead yield from the matrix material on the bronze bearing bushing surface
Authors: Morozov Alexander , Fedotov Gennady , Kundrotas Kyastutis
Published: January 2020

The data on the effect of electromechanical mandreling (EM) modes of rolled bushings made of Bronze-Tin-Zinc-Lead (BTZL) 4-4-2.5 on the lead yield from the matrix material to the work surface are given. As a result of an X-ray analysis, it was found that up to 13.3% of lead is eliminated from the matrix material to the bushing’s surface, filling all irregularities after machining, bringing the actual contact area to the contour one and significantly reducing contact stresses under loading, which serves as a reserve for increasing the movable joint’s durability, along with decreasing the friction torque in the joint when operating under ‘film’ starvation conditions.
Mechanical behavior investigation of constructional steels applied in amphibious all-terrain vehicle at different temperatures
Authors: Mishakin V V , Kurashkin K V , Gonchar A V
Published: January 2020

This article presents a comparative analysis of the mechanical properties of steel 20 (ASTM 1020) and steel 09G2S (ASTM A516 Gr 70) used in the construction of amphibious all-terrain machines developed for operation in the Arctic and Antarctic. Research included static tensile tests, hardness measurements, fracture toughness measurements, and fractographic studies. Experimental investigations were carried out in the temperature range from –60°C to +50°C. As a result of the studies, the express-method for assessing the material state according to hardness measurements is proposed.
Construction of elastoplastic shallow panels manufactured by stretching from sheet metal
Authors: Dedov N V , Isytkina V N
Published: January 2020

In the article, in a geometrically and physically nonlinear formulation, the problem of the stress-strain state of shallow shells on a rectangular plane under pressure loading is solved. The solving equations of the theory of flexible shallow shells are obtained on the basis of the Henki-Ilyushin deformation theory of plasticity and the equations of the geometrically non-linear theory of shells, which contain quadratic terms with respect to the angles of rotation of the normals to the median surface. The geometrical parameters of the median surface are taken in the initial undeformed state. The equations are written in a form that makes it possible to carry out numerical calculations of problems with allowance for geometric and physical nonlinearities or only with geometric nonlinearity, to take into account unloading, compressibility of the material and secondary plastic deformations. The results of numerical calculations of critical loads, unloading zones and secondary plastic deformations are presented. Recommendations are given on the choice of geometrical parameters when designing shallow shells.
Model of monitoring precision of technological processes based on principal component analysis
Authors: Seregin A , Kravtsov A
Published: January 2020

The article presents the results of theoretical and experimental research to improve the accuracy of machining of complex shapes on CNC machines. The proposed monitoring system improves the quality of operation of technological systems as a whole. A new analytical method for assessing the quality of products obtained on CNC machines is given. Monitoring consists of: evaluation of the accuracy and rigidity of the technological system of the machine; monitoring the state of the machine based on the analysis of technological accuracy of processing; control of accuracy of processing by adjusting the program for the CNC system and changing the processing modes.
Analytical support for effective functioning of intelligent manufacturing and transport systems
Authors: Kripak M N , Palkina E S , Seliverstov Ya A
Published: January 2020

The formation of the digital economy is one of the important priorities in the development of the information society. The article is devoted to the problem of improving the efficiency of the transport system, taking into account the development of industry based on implementation of digital technologies. The approach to the organization of the regional logistics center, assuming the division of space into clusters, has been presented. Two cases of the cluster model, depending on the size and number of clusters relative to the size of the city, have been examined. This forms the methodological basis for the construction of the functional architecture of the intelligent transport system.
Improving the accuracy of threading by optimizing the design of the tool
Authors: Nikitina I P , Polyakov A N
Published: January 2020

The paper presents the original design of a special tap for cutting precise threads. Distinctive design features of the tap are: the presence of the rear threaded guide, which together with the copier threaded sleeve of appliance perceives the axial forces and provides the tap axial feed strictly corresponding to the step of the thread being cut, excluding its breaking under the action of axial forces; the presence of a smooth front guide part with the direction on the cut hole, to reduce the influence of radial forces that lead to an increase in the diameter of the thread due to the radial vibrations of the tap; the presence of the chamfer that implements the most technological cutting scheme such as flank infeed. A prototype of a special tap made on a turning and milling machine tool is presented, confirming the manufacturability of the proposed tool design. Research conducted in the field of engineering analysis with the CAE-system Ansys showed a significant increase in structural rigidity, as well as a significant increase in natural frequencies.
Optimization of the structure of rolling stock of urban passenger transport
Authors: Bodrov Andrei , Lomakin Denis , Gagarin Ilia
Published: January 2020

This article examines the problems related to the operation of urban passenger transportation system in the field of defining the structure of the rolling stock, the analysis of existing methods of identification of the number and capacity of the urban vehicles has been conducted. The paper focuses on the results of experimental research of passenger flows and roominess, volumetric capability of a variety of transport means (public transportation minibuses) in the district municipalities of the Russian Federation. Furthermore, taking into account these results, differences and variety of these vehicle makes and models, the measures and activities have been suggested, aimed at improving the methods of selection of urban passenger transport rolling stock.
Hardening of weld with metastable austenite structure by surface deformation
Authors: Zverev Sergey , Korobov Iurii , Fiveyskiy Andrey
Published: January 2020

The study shows a technology comprising MIG deposition of cored wire like 50Cr18 with the subsequent surface deformation. Specially developed device realizes adjustable ball rolling load. The structure of the weld includes a large share of metastable austenite, which transforms to hard martensite at loading. The measuring shows that the technology provides an increase of the sample’s surface hardness from 40 HRC to 54 HRC and decrease it’s roughness from Ra 1,2 to Ra 0,4. The results allow using the technology applying to hydraulic pistons.
Optimization of cutting tool design by power and thermal parameters of machining process
Authors: Zhilyaev Anton , Kugultinov Sergey
Published: January 2020

The article presents the results of experimental studies to determine degree of influence angles of cutting wedge of end mill on force and thermal processes occurring in cutting zone. On the basis of the obtained data, the ways of reducing level of deformations thin-walled body parts made of aluminum alloys are considered. A comprehensive analysis of designation front angle of cutting tool was carried out in design at preproduction stage.
Ways to increase road train’s controllability and transverse stability
Authors: Baranov A S , Pavlyuk A S
Published: January 2020

The problem of controllability and transverse stability is quite urgent for the road trains in operation. There are two ways to improve these operational properties: the choice of rational design parameters of the train units and the use of special devices to improve controllability and transverse stability. As a criterion for assessing the controllability and transverse stability of a multi-unit road train, it is proposed to use a dynamic magnification factor. When calculating the dynamic gain factors, a linear mathematical model of a three-link road train was used, consisting of a three-axle tractor unit, a three-axle semi-trailer and a five-axle trailer with a two-axle dolly. The simulation model allowed to optimize a number of design parameters of this road train’s units. As a result of the optimization, it was found that the values of the dynamic magnification factor decrease with movement of the fifth wheel and towing hook forward (up to 20%), as well as increasing the length of the drawbar relative to the nominal position (up to 3%). These recommendations allow choosing rational characteristics of road trains and improving their design already at the design stage.
Experimental evaluation of profile passability of terrain vehicles
Authors: Klubnichkin V E , Klubnichkin E E , Evseev K B
Published: January 2020

The article presents the results of experimental evaluation of profile passability of the Russian- and foreign-made utility terrain vehicles (UTV).Russian-made UTVs RM 650-2, RM 800 (by JSC Russkaya Mekhanika), Stels 800 Guepard (by GC Velomotors). Foreign-made UTVs Yamaha Grizzly, BRP Outlander Max XT, BRP Outlander 6x6, Polaris Sportsman 1000. The tests to determine profile passability of the Russian and foreign UTVs were conducted for the following cases: 1) UTV climbing; 2) UTV downhill movement; 3) UTV aslope movement; 4) Trench crossing of an UTV; 5) Hole crossing of an UTV; 6) UTV crossing of a single irregularity in the form of a log.
Tool life estimation using acoustic emission signal
Authors: Khripunov N V , Vaskin K Y
Published: January 2020

A study was carried out on predicting the working life of a metal-cutting tool using an acoustic emission signal in comparison with predicting the working life of a metal-cutting tool based on the standard chemical and mechanical properties of the material being processed. A group of samples of six steels with a known chemical composition and mechanical properties was used as materials. Lifetime testing was carried out during milling with a single-blade cutter and the initial ranking of the steels according to their workability based on the relative intensity of wear rate of the tool was obtained. Acoustic emission signal reading was performed under similar processing conditions with determination of the integral energy characteristic of the RMS signal. During comparison of the relative hardness, the relative sulfur content and the relative RMS, it was found out that only for RMS there is correct compliance with the results of lifetime testing. The result obtained shows the effectiveness of the use of the acoustic emission signal for predicting the tool working life.
Heat - and Wear-Resistant Nanocomposite Material Based on Copper Powder for Valve Guides of High-Forced Engines
Authors: Vladimirova Y O , Shalunov E P
Published: January 2020

The article presents the results of the development of heat - and wear-resistant nanocomposite material based on copper powder Cu-Al-C-O system, which due to the optimally selected chemical composition and dispersion-strengthened structure with a strengthening phase γ-Al2O3 of nanodispersed range has a set of physical, mechanical and operational characteristics, at its level significantly higher than the similar characteristics of the standard bronze CuNi2Si F65 DIN 17666, used by a number of engine companies for the valve guides of powerful and high-forced internal combustion engines. In particular, the wear resistance coefficient for the valve guide made of this material is 17 times higher than for the guide made of this standard bronze. In this case, the coefficient of score-resistance of the bushings of the new material is 2.54 times higher than the same index for the bushings of bronze. Moreover, it also provides the least wear not only of the guide bushing but also of the valve, i.e. of the entire pairing as a whole.
Balanced management of innovative risks in the process of innovative development
Authors: Ponikarova A S , Zotov M A , Kadeeva E N
Published: January 2020

The article considers the issues of balanced management of innovative industrial risks as a mechanism to increase the efficiency of organizations innovative development. The place of this complex of management measures in the overall management system in the process of introducing innovations in the face of uncertainty and risks is determined. An augmented model of balanced management is proposed taking into account the innovative nature of company development and the risk factor. The role of innovative industrial risks is defined as a limitation of innovative development, and a method for effectiveness assessment of their balanced management by assessing the complex level of system survivability is developed. Thanks to this method, it is possible not only to assess the quality of the innovative industrial risks management system, but also to identify ways for its improvement and development.