bluuebunny/crossref_metadata_2025_split huggingface dataset:
Design development of technological complex for friction welding of thin-walled products made of armlen
Authors: Nemtinov V , Sergeev V , Nemtinova Yu 
Published: January 2020

Abstract
In this paper, we present the results of engineering design of a technological complex for friction welding of thin-walled products from armlen. We have also analyzed welding methods for plastic details. The main technological parameters of friction welding are: relative speed of welded surfaces rotation or linear velocity of the planes relative to each other; melting pressure for creating of a friction force; heating time; sediment pressure; cooling time of the weld. Each of these parameters depends on the material type and the shape of welded surfaces, assuming that absolutely flat surfaces are considered, since flatness does not strongly affect these parameters for thin-wall products. Further, welding technology of thin-walled parts from mineral-filled polypropylene (armlen) is offered, calculations of technological parameters of welding process are carried out and an electronic model of the complex is developed. On the basis of the electronic model and drawings, a prototype of the technological complex was made. Approbation of the complex on the example of gas-proof boxes production showed its high efficiency and prospects of its use for the whole class of thin-walled products from armlen.
Designing a duplicate model of the GTE turbine blade casting process
Authors: Vdovin R A 
Published: January 2020

Abstract
The work describes the results of developing a duplicate model of the gas turbine engine blade casting process. The work was based on the development of the digital “furnace-flask-filler-mould-metal-stopper” process system considering the geometrical, structural and thermophysical specifications of the turbine blade casting process. The industrial approbation of the developed process under the experimental production conditions exemplified by the manufacture of the GTE turbine moving blades demonstrated a 3- to 4-fold decrease in time of the blade blank manufacturing cycle due to the virtual multi-iteration optimization of the process.
Mechanized installation for molding of wood-concrete panels
Authors: Nikitina I P , Polyakov A N , Utkin I A 
Published: January 2020

Abstract
The article presents new technical solutions aimed at improving the performance of the installation for the molding of wood-concrete slabs. Calculation and design of rotary wheel racks which provide movement of installation in two mutually perpendicular directions is made; the proportioning bunker; conveyor that distributes and discharges the ready mortar into the formwork with two pneumatic cylinders; frames of plate forming installation. The study of the frames of plate forming installation, proportioning bunker and conveyor. Engineering analysis was carried out in CAE system ANSYS. Engineering analysis included five types of calculations: calculation of stiffness with rigid and elastic grip conditions, modal analysis, dynamic calculation, thermal and thermal-deformation calculations. The obtained results of the engineering analysis allowed us to conclude that the deformation of the frames is insignificant, that is, their rigidity provides the required accuracy of the manufacture of plates and the accuracy of the position of the proportioning bunker relative to the conveyors. The carried out measures on modernization of plate forming installation provided increase in productivity approximately in 2 times.
Experimental and theoretical research of a hot condition of the T–100–130 steam turbine
Authors: Kudinov I V , Tkachev V K , Tarabrina T B , Klebleev R M 
Published: January 2020

Abstract
Based on thermal profiling of the cylinder of a high pressure cylinder (HPC) of T–100–130 stream turbine detailed researched has been performed to study its temperature conditions during startup. Using experimental data about the temperature condition of an external surface of the cylinder, by way of solving the inverse problem of heat conductivity the average heat transfer coefficients have been determined during the period of startup on its internal surface (on the steam side). At the same time, approximated analytical solution of the heat conductivity problem has been applied for the cylinder’s two-layered insulation (thermal insulation – metal wall). Using the data of experimental and theoretical research thermal stresses have been identified in the cylinder wall, as well as the stresses due to the effect of steam pressure forces. It has been shown that in certain profiles of the turbine cylinder stresses are able to exceed the ultimate stress limit for that material. Using experimental data about the changes in certain parameters (temperature differential for the top- and bottom sections of the cylinder, differential in the shaft- and cylinder extension, vibration indicators, etc.) a theoretical method has been developed for forecasting their changes during a certain time interval as measured from the time of current measurement.
Integrated approach to process design of manufacturing of high-precision products
Authors: Nazaryev A , Bochkarev P , Reshetnikova E 
Published: January 2020

Abstract
In the present paper considers the structure of the complex design procedures (integrated approach) of the system for taking into account the requirements for the assembly of high-precision products in the design of manufacturing methods of machining, which is based on the establishment of a link between the process design of machining and assembly plants, is considered. Also, the paper considers mathematical models and approaches to system ware implementation.
Theoretical justification of the type of a flat-cutting working body of a ploughshare
Authors: Belousov S V , Samurganov E E , Rodionenko A I 
Published: January 2020

Abstract
The work is dealt with main tillage, namely the theoretical substantiation of the type of a flat-cutting working body of a ploughshare. The article has a research character, which is expressed in the fact that there were given the theoretical analysis of the method of manufacturing working bodies of a similar profile for ploughshares with different widths. Also, there was justified the type of a proposed design, its description and flow of technological process were given. As a result of the work done, there was obtained the theoretical dependence of justification of the shape of a flat-cutting working body of a ploughshare. The conclusions show the main results achieved so far.
Failure features of laminated materials under static and cyclic loading
Authors: Kamantsev Ivan , Kuznetsov Aleksei 
Published: January 2020

Abstract
The paper discusses the behavior of a hot-rolled laminated metal material under cyclic loading according to the three-point bend and uniaxial static tension scheme. It is shown that the creation of a gradient structure provides increased resistance to the fatigue cracks growth while the propagation of a fatigue crack does not cause interlayer delamination, and the effect of retardation is realized until the crack tip reaches the interface of the layers. Under the conditions of static tension, the laminated material obtained by hot batch rolling has an increased ductility, and delamination along the interfaces occurs as a result of the formation of a neck and, as a result, a change in the stress state in the plastic deformation zone.
Formation of a narrow hard layer in the AlMg6 alloy near the contact surface after extrusion through a conical die
Authors: Smirnova E O , Smirnov A S , Alexandrov S E 
Published: January 2020

Abstract
A technique for determining the thickness of a deformed layer obtained at the contact with a rough deforming tool is verified by means of kinetic indentation. The AMg6 aluminum alloy is investigated after extrusion through a conical die with a semi-angle of 1.5°. The analysis of the experimental data has shown the existence of a 200 μm deformed layer near the contact surface.
Effect of nanosized oxide fillers on the adhesive strength of epoxy lacquer under scratching
Authors: Smirnov S V , Veretennikova I A , Konovalov D A 
Published: January 2020

Abstract
The paper reports on the results of a comparative study of the adhesive strength of coatings made of unfilled epoxy lacquer and lacquers filled with nanosized TiO2, SiO2, and ZnO oxides, which have been obtained in scratch testing experiments. The coatings are applied onto an aluminum-magnesium alloy base. The value of specific elastic energy per unit area of the cohesion boundary is used as the measure of adhesion. Scratch testing is performed with conical Rockwell indenters on an attachment to a Zwick 2.5 testing machine. The coating modified with silicon dioxide proves to have the highest resistance to adhesive failure under local action among all the studied coatings based on epoxy lacquer.
Uneven degradation of the material during the operation of turdine blades
Authors: Tsareva I N , Berdnik O B , Kirikov S V , Krivina L A 
Published: January 2020

Abstract
Turbine rotor blades operate under the action of centrifugal forces, which create height-varying stresses. The temperature field of the blades is also inhomogeneous, and the value of its gradient depends on the flow parameters and the geometric dimensions of the blades. In the process of manufacturing and quality control of completed turbine rotor blades, the manufacturer uses the generally accepted state standards to determine the condition during long-term operation. It is assumed that the material of the blades should be uniform all over the volume so that the manufacturer proposes analyzing mainly the blade root. In this case, mechanical tests are carried out on large samples and the results provide only averaged data on the state of the material. Life prediction based on the results of mechanical tests can lead to a mistaken overestimation of service life. This is because this approach takes into account only the state of the internal zones of the material. However, the rupture of material occurs on the surface and in the more thermally stressed parts like the trailing edge or leading edge. As a consequence, the application of this approach is unacceptable for blades with long operating time.
Design features of the steering control systems of road trains and articulated buses
Authors: Chudakov O I , Gorelov V A 
Published: January 2020

Abstract
One of the important properties of road transport vehicles is maneuverability, which directly affects the performance and safety of transportation, as well as the total cost of freight and passenger traffic. The paper discusses the design features of various steering control systems and their effect on the maneuverability of vehicles.
Modeling of heat and mass transfer processes in cooling towers and structure optimizing of polymer filler
Authors: Afanasenko V G , Kulakov P A , Galimova Yu L , Sidorkin D I 
Published: January 2020

Abstract
The closed water recycling systems with the main element being the evaporative water cooling devices or cooling towers are used to cool the main equipment of industrial enterprises. During these processes the recycled water is being polluted and lost, therefore it is necessary periodically provide this water volume from natural sources. Improving the efficiency of cooling towers can reduce the negative factors of such systems’ operation. This article presents the researchof the aerodynamic characteristics of heat-and-mass exchange packs of cooling towers made of vertical polymer pipes. The design of the optimized cooling tower filler unit is described and recommendations for improving the efficiency of evaporative cooling process of the circulating water are given.
Investigation of the effect of elastic-plastic loading modes in the manufacture of metal flywheels on their performance properties
Authors: Berezhnoi D V , Sachenkov A A , Xu Yingqian 
Published: January 2020

AbstractThe work introduces the so-called “true” deformations, i.e. for final deformations, three deformations of elongations and three components of shear deformations are taken as a measure of deformations. The so-called generalized stresses, referred to the units of the corresponding areas before the deformation of the body, and “true” stresses, referred to the units of the corresponding areas after the deformation of the body, are introduced into consideration. Based on the constructed relationships, an algorithm for solving the variational problem of the three-dimensional theory of elasticity is constructed, and a finite-element method for solving the problems of deforming elastoplastic structures is developed and implemented. The practical problem of deforming the pre-stressed kinetic energy storage has been solved.
Numerical modeling of concrete deformation processes during its interaction with reinforcement
Authors: Berezhnoi D V , Laalai Faicel , Sekaeva L R 
Published: January 2020

Abstract
The aim of the work is to propose a numerical model of the interaction of reinforcement with concrete in order to be able to simulate the operation of structures of building and transport facilities. In the course of the study, the authors carried out a numerical simulation of the processes of deformation of concrete during its interaction with reinforcement; a model was implemented based on linear connections with finite rigidity. The results of the calculation were compared with the experimental data, the dependence “pulling force - reinforcement slipping relative to concrete” was constructed.
Assessment of the influence of the surface modification process on the wear intensity in the operation of internal combustion engines loaded parts
Authors: Akhtulov Alexey , Dadayan Sergey , Edigarov Vyacheslav 
Published: January 2020

Abstract
The regularities of the influence of material surface layer parameters on the wear resistance of the rubbing surface of machines and equipment engine parts during operation are considered. The methods of wear intensity assessment for choosing the best constructive solutions of the aggregates and the optimal surface treatment of friction parts are proposed. The results of electromechanical treatment of friction surfaces of steel parts with the preliminary application of a thin antifriction layer of various solid lubricants on the surface of the workpiece, which improves the structure of the surface layer and increase performance, especially wear resistance and antifriction properties are shown.
Influence of joule heat and heat of electric arc on the vortex flow in DC arc furnace
Authors: Kazak O V , Starodumov I O 
Published: January 2020

Abstract
The paper devoted to the numerical simulation of processes in DC electric arc furnaces with the bottom electrode. These furnaces have shown higher efficiency, low heat loss, lower components wear and higher quality of steel production. The biggest disadvantage of such furnaces is a high rate of fettle wear near the bottom electrode that connected with electrovortex flow. Electrovortex flows appearing under electromagnetic forces as a result of non-homogeneous distribution of the current density through the liquid conductor. This effect can be observed in many technological processes: electro slag remelting process (including DC and AC metallurgical furnaces, electrolysis cells and submerged-resistor induction furnaces), arc welding, processes of semiconductor crystals growing, electro vortex engines etc.
Dynamics and strength of planetary gear with elements of increased flexibility at transient modes
Authors: Plekhanov F I , Pushkarev I A , Pushkareva T A 
Published: January 2020

Abstract
The increased flexibility of links and details of planetary gear allows to reduce unevenness of load in gear meshing. On the other hand, the probability of emergence of vibrations increases. For the analysis of dynamics and strength of planetary gear during running-up the system of nine differential equations received earlier is used. For lowering of degree of a system a number of assumptions is accepted. The most part of deformations, in view of smallness, and the related elastic forces, are not considered. In the generalized forces the following power factors are left: torques of the engine and forces of useful resistance; elastic forces in axles of satellites. The system is reduced to two equations: vibrations of a satellite axle and rotation of a sun gearwheel. Dependences of natural frequencies of vibrations of satellite axle on gear parameters are received. It is considered the constant and variable torques of driving forces. Proceeding from satellite axle strength of bending, dependences between extreme value of the driving torque and rotary speed of a sun gearwheel and mass and dimensional characteristics of planetary gear are set.
Modelling of dynamic processes in an elastic base with a heterogeneous coating
Authors: Belyak Olga , Suvorova Tatiana 
Published: January 2020

Abstract
In this paper, we consider a mathematical model describing the dynamic properties of heterogeneous materials having a non-uniform layered structure in the form of a non-uniform elastic coating with a microstructure lying on an elastic base. The dispersion function for a two-layer composite medium is given, showing that the heterogeneous coating of an elastic half-space significantly changes the dynamics of the medium.
Simulation of the temperature distribution in semi-finished products of combined abrasive tools during their microwave heating
Authors: Sapunov V V , Vetkasov N I 
Published: January 2020

Abstract
When producing of the abrasive tool using one of the most reliable operations is the thermal processing operation. Heating nonuniformity during the thermal processing adversely affects the quality of the abrasive tool and can lead to it being rejected. In this paper there are computational simulation results of the heating process of semi-finished products of combined abrasive tools in the microwave field presented and recommendations on the uniformity improvement of the temperature distribution along the whole volume of the heating object are provided.
To the problem of the methodology for evaluating the effectiveness of the use of superplasticizers in concretes
Authors: Nesvetaev Grigory , Koryanova Yuliya , Korchagin Igor 
Published: January 2020

Abstract
Based on the analysis of the effect of various superplasticizers on the compressive and tensile strengths of concrete hardened under different conditions for three months, it was concluded that to estimate the effectiveness of superplasticizers it is not enough to compare the relative strength indicators of concrete only (f90/f28; ft = f(f); f = f(W/C)) without taking into account the effect of the superplasticizer on the water content in the concrete mix and the cement content. The assessment methodology is given. It is shown that provided the required design parameters for durability are ensured, analysis of only data on the increase in compressive and tensile strengths in time can lead to erroneous conclusions. A reliable assessment should be made taking into account the influence of the superplasticizer on the composition and cost of the concrete mix, shrinkage, creep and E-modulus of concrete.
Technological aspects of state regulation of the development of power engineering
Authors: Chernenko O , Savon I , Isik L 
Published: January 2020

Abstract
The article discusses the reasons for the unsatisfactory state of the technical, technological and sectoral structure of power engineering. The importance of power engineering as the most important branch of the domestic industry, providing the release of high-tech equipment for various types of power plants and industrial energy, is substantiated. It is revealed that ensuring timely progressive transformations in this industry is the most important task of state regulation of the economy.
Increasing the activity of cements during mechanical activation of raw materials
Authors: Krivoborodov Yury 
Published: January 2020

Abstract
The article is devoted to the study of the influence of dispersion of raw mixtbres on the properties of Portland cement clinker. The study established that the mechanical activation of raw mixtures by hydrodynamic effects significantly accelerates the processes of mineral formation during the synthesis of clinkers. In this case the microstructure and phase composition of clinkers changes. Clinkers from activated mixtures are characterized by clear crystallization of minerals, their uniform distribution and increased content of the alite phase. This determines the high mechanical strength of cements based on these clinkers. At the use mechanical activation of waste it is possible to obtain high level activity one.
Organization of a virtual enterprise in information systems
Authors: Bondarchuk Evgenii , Feofanov Alexander , Grishina Tat’jana 
Published: January 2020

Abstract
To date, the current issue in the global economy is its digital transformation. Modern digital technology in the process and product activities of the company implies the introduction of CALS-technologies, PLM, MES, ERP systems, and the interaction between agents opens the possibility of creating a virtual enterprise. The main difficulties are in the non-digital culture of enterprises, in the conservatism of people, their desire to preserve the status quo. The task of creating optimal organizational structures and a CALS system can only be solved under the conditions of a specific virtual enterprise.
Improvement of ironing technology in restoring and hardening worn out car parts
Authors: Ageeva E V , Altukhov A Yu , Novikov A N 
Published: January 2020

Abstract
Currently, active research is being conducted in Russia and abroad to study the so-called composite electroplating coatings (CEC). The promise of this method lies in the fact that by introducing special additives into the electrolyte, which are usually fine powder, coatings can be obtained with properties unattainable with ordinary electrolytes. For the introduction into the electrolyte, as a hardening additive, it is recommended to use powders obtained by the method of electroerosive dispersion. The process of obtaining powder materials by the method of electroerosion dispersion differs favorably with the possibility of obtaining powders even from particularly hard and refractory materials. In the case of grinding material with this method, the only important criterion is the electrical conductivity of the material being ground. Worn parts and other scrap can be used as feedstock during the process. The purpose of the study is to improve the technology of restoring worn automotive parts with composite electroplated coatings due to the use of electroerosive powders as a hardening phase. Due to the study of samples of the used powder, as well as the study of the properties of the deposited coatings on modern devices, results were obtained showing the high potential of this recovery method. It has been established that even a small addition of EDM powder to the electrolyte (5 g/l) allows to improve the performance of the deposited coating.
Structural phase changes during deformation of FeCo-V alloys by torsion under high pressure
Authors: Glezer A M , Luzgin D V , Muradimova L F , Shirshikov S O , Libman M A , Schetinin I V , Perov N S , Dyakonov D L , Sundeyev R V 
Published: January 2020

AbstractThe effects of high pressure torsion at 77 and 295 K on the phase composition of soft magnetic alloys (FeCo)100-xVx(x = 0 - 6.0) were studied by X-ray structure analysis, transmission electron microscopy and magnetometry. It was established that HPT leads to the suppression of excess γ-phase in alloys containing 3.0–6.0% V. It was concluded that the observed effect was a consequence of the martensitic transformation γ→α, due to deformation, along the lines of TRIP effect. It was established that suppression of the paramagnetic γ-phase leads to a noticeable increase in the specific magnetism of saturation.