bluuebunny/crossref_metadata_2025_split huggingface dataset:
Unified approach to developing analytical models of different grinding processes based on basic cutting process model
Authors: Akintseva A V , Pereverzev P P , Prokhorov A V , Kononov S N 
Published: December 2020

Abstract
The appearance of modern CNC grinding machines allowed concentrating multipass and multistage processing of different workpiece surfaces by means of using different grinding types and different tool types. Meanwhile, the processing of different surfaces is carried out with different allowances and accuracy requirements and performed according to the specified stepwise cycles of the feeds control. As a result, there is a difficult task of quick and reliable calculation of the optimal feed cycles and other cutting modes for different types of processing of different surfaces with various grinding conditions. The solution to this problem is developing of mathematical models that link processing accuracy with cutting modes and other technological conditions of the processing. The development of such models should begin with the creation of a complex of the cutting forces` models for each grinding type. This article describes a method for deriving generalized analytical model of the cutting force for the different grinding types which is based on the functional interrelation between the intensity of the metal removal performed by the wheel and elementary volumes of metal deformable in the shear zone. The complex of the cutting forces models for different grinding types, obtained by means of using this technique, establishes functional interrelation of the cutting force with cutting modes, strength properties of the treated material, kinematics of the grinding process, geometry of the cutting zone, characteristics and geometric parameters of the grinding wheel, etc. It should also be noted that the developed models cover the majority of production conditions and they are wide-range in terms of the main technological parameters (dimensions of the treated surfaces, allowances, tolerance grades, etc.).
Development of a control system for large-sized products to improve product quality in mechanical engineering
Authors: Sinitsa M O , Komshin A S 
Published: December 2020

Abstract
The paper considers the problems of monitoring the metrological support of overall parts in mechanical engineering. The decision to implement the control of large products such as ship’s shaft. In addition, an algorithm for analyzing control results using the Matlab program to assess the state of the object of study is proposing.
Development of the algorithm for modelling autoclave curing conditions and calculation of temperature fields into elements of sandwich structures
Authors: Morozov B B , Nasonov F A , Bukharov S V 
Published: December 2020

Abstract
To study the distribution of temperature fields into a large-sized combined parts, it is necessary to devote a great attention for all the design features. A specimen for investigation the “behavior” of the material in different zones of a typical PCM panel must simultaneously contain both a monolithic and sandwich part of the structure.
Profiles’ classifier of hot-rolled rolling
Authors: Belskiy S M , Pimenov V A , Shkarin A N 
Published: December 2020

Abstract
The geometric parameters describing the features of the cross-sectional profile of the hot-rolled strips do not give a complete picture of the flatness acquired by the cold-rolled strips rolled from these strips. An additional analysis showed that there are four characteristic classes of cross-sectional profiles of hot rolled strips that have a significant effect on the shape of the strips during cold rolling, three of which negatively affect the flatness of the cold rolled strips. The cross-sectional profiles of hot-rolled strips with a concave middle part and (or) marginal thickenings lead to the appearance of edge waviness, peak-like cross-sectional profiles cause central warping. Therefore, the actual task is to determine the factual shape of cross-sectional profile. Sixth order polynomials were used to digitalize and parameterize hot-rolled profile. As a result, we developed analytic function of the transverse profile, which keeps important information about its near-edge areas and features in the middle part. To assign a specific cross-sectional profile of a hot-rolled strip to one of four characteristic classes of cross-sections, mathematical software was developed, called a classifier, and implemented with the programming environment R. To classify the profiles of the hot-rolled cross-section according to characteristic classes, a linear discriminant method was used as a machine learning method analysis. The result is an adequate mathematical model for recognizing the shape of the cross-sectional profile.
Tool Performance Under Ultrasonic Reaming
Authors: Agapov S I , Sidyakin Y I , Olshtynsky S N 
Published: December 2020

Abstract
The widespread adoption of ultrasonic processing methods was hindered by the lack of reliable ultrasonic heads. Currently, in connection with the widespread production of piezoceramic transducers of various shapes and sizes, it has become possible to abandon bulky magnetostrictive transducers requiring individual cooling. The creation of light piezoceramic heads and their implementation in production is associated with targeted comprehensive studies to determine the magnitude and direction of ultrasonic vibrations, the influence of technological factors on the surface roughness and accuracy of the obtained holes. This processing method is especially important in aircraft engine building, where the issue of obtaining quality holes is particularly acute. Difficulties in the processing of holes by reaming are associated with the low machinability of the used steels and alloys in aircraft engine construction. The cutting edges wear out at the intersection of the intake cone and the calibrating part the more intensively, the higher the processing conditions. The process of holes reaming is one of the most difficult and critical stages of machining, on which the quality and the final result of the machined parts depend. This paper describes the experiment and gives experimental data on the influence of the magnitude and direction of ultrasonic vibrations on the resistance of a cutting tool, as well as the effect of wear on surface roughness and accuracy of machined holes. The research has established a significant advantage of ultrasonic reaming in terms of surface roughness, the accuracy of holes, and the resistance of the cutting tool in workpieces made of difficult-to-process materials.
Melting dynamics of electrodes, additive materials in welding
Authors: Fedyaev V L , Galimov E R , Belyaev A V , Sirotkina L V 
Published: December 2020

Abstract
We consider electric arc, electroslag welding with a consumable electrode, as well as other types of welding (gas, plasma, etc.) using rod filler materials. Two schemes of the corresponding type of welding are distinguished - the first, when an electrode has a finite length, the location of the current lead relative to it is stationary. In the second case, the electrode moves relative to the place of current supply in such a way that the length of the part of the electrode from its end to the place of current supply during welding varies little. A number of assumptions are made, a mathematical description of the heating and melting of the electrodes, filler materials due to the heat of the welding sources, and ohmic resistance is presented. Relations are given for estimating the temperature distribution along the length of an electrode, filler rods, and their melting rate.
Features of making non-rigid parts from titanium and aluminium alloys
Authors: Kiselev E S , Nazarov M V 
Published: December 2020

Abstract
The work is devoted to the question of machining non-rigid parts. The results of studies on the efficiency of making non-rigid parts from titanium and aluminium alloys by reducing the cost of technological preparation of production and use of energy of low-power modulated ultrasonic field are presented
Effect of hydro-jet treatment on the adhesion of the PVD coating to the carbide substrate as a method for pretreatment of the surface
Authors: Fedorov S V , Sazanov I I , Igonov D V , Seitkulov A R 
Published: December 2020

Abstract
Traditionally, the first stages of preparing a hard alloy for coating are various mechanical, electrical, chemical, and magnetic methods to change the surface quality, which usually increases the service life and wear resistance of the tool. Among other things, hydro-jet treatment, so exposure to a high-pressure water jet at a pressure of about 250 MPa, can be used when preparing the surface for coating. Grinded surfaces after hydro-treating show better adhesion of the coating by removing an excess of the cobalt bond smeared on the surface because it is highly flexible and poorly removed by the diamond grinding wheel. Besides, the surface roughness reduced. Wear tests using the spherical recess method showed a two-three fold improvement in the wear resistance of TiN-coated samples subjected to preliminary hydro-treatment. Besides, hydro-treating avoids surface contamination and eliminates any thermal effects.
Research of frost-resistant rubber for seals
Authors: Asheichik Anatoly A , Bahrami Mohammad Reza , Zorin Daniil K 
Published: December 2020

Abstract
As a result of experimental studies, the dependencies of the static modulus of elasticity of the five rubber compositions during bending on the temperature in the range from - 70 to +100°C were established. The results of the temperature test simulating the change in contact stresses in the seal after installation at 20°C and subsequent cooling, as well as the temperature test, when the bending deformation is increased after cooling, are also presented. The dependences of the coefficient of friction of rubber on fluorine-containing coatings of three types and steel were experimentally obtained in a wide range of negative and positive temperatures. The design of the test bench for studying the elastic moduli during bending of rubber and polymer samples in a wide range of bending deformations and temperatures and the test procedure for it is described. A methodology for studying the coefficient of friction of rubbers during friction on fluorine-containing coatings and steel in a wide temperature range is presented. Friction coefficients were determined during unilateral rotational motion of flat samples at a sliding speed of 0.2 m/s, pressures on the friction surface from 0.8 to 50 MPa and a temperature range from -40 to + 120°C.
Prediction of phase composition and anticorrosive properties of Zn-Ni-Co alloys
Authors: Schmidt V V , Zhikhareva I G , Denisenko D V 
Published: December 2020

Abstract
The possibility of theoretical prediction of a given phase composition (intermetallide Ni5Zn21) of Zn-Ni-Co electrochemical alloys using four phase formation criteria: entropy (ns), dimensional (nd), energy (no) and general (nº) is shown. A theoretical method is proposed, which allows to predict the ratio of metal ions in solution and the phase composition of ternary electrolytic alloys, using Zn-Ni-Co alloy containing intermetallides as an example. Formation conditions (chemical content of the components in the coating) and the length of concentration boundaries of the metal-solvent (Zn) for electronic compound Ni5Zn21 (γ phase) are calculated.
Dense ceramics based on magnesium aluminate spinel with the addition of gallium oxide
Authors: Ulyanova A V , Senina M O , Lemeshev D O 
Published: December 2020

Abstract
The preparation of dense ceramics based on magnesium aluminate spinel (AMS), a material with unique physicochemical properties, is considered. The work shows methods for producing AMS powders of stoichiometric composition by the method of reverse heterophase co-precipitation, studying the influence of the firing temperature and of the method of introducing of the sintering additive of gallium oxide on the ceramic properties of the obtained samples.
Features of the structure of interfacial layers in polymer composites
Authors: Zhukova G S , Radjabov Z R , Boykova G V 
Published: December 2020

Abstract
Using relaxation spectrometry methods, the features of formation of interfacial layers in polymer composites based on 5-211-BN epoxyanilinophenol formaldehyde binder reinforced with CBM high-modulus aramid fibers are studied. The cases of the initial unmodified and modified neutralization of the surface of the reinforcing filler under loading in various temperature-time regimes are considered. It is shown that the used set of relaxation spectrometry methods allows one to evaluate the features of formation and the structure of interfacial layers in polymer-polymer systems. It is established that the morphological structure of the interfacial layer is strongly dependent on the chemical nature of the components and on the intensity of their interaction.
Contemporary methods of production of titania
Authors: Vyboishchik A V , Popov M Yu 
Published: December 2020

Abstract
The article describes various processes of the manufacture of titanium dioxide, or titania, with two methods, viz. chlorination and sulphatization, presented. The detailed description of the features, advantages and existing submethods of the chlorination method and its comparison with the sulphatization method are given. High-frequency induction oxygen plasma submethod has been considered the most prospective in the manufacture of titanium dioxide.
The study of high-temperature stability of the thermoprotective coating made of zirconium dioxide
Authors: Tsareva I N , Berdnik O B , Razov E N , Maximov M V 
Published: December 2020

Abstract
Laser heating method is proposed for the evaluation of high-temperature stability of thermal protective coatings of zirconium dioxide. Structural-phase state of plasma thermal protective coating of zirconium dioxide has been investigated after laser pulse altering with a different energy. Processes of phase transformation, melting and recrystallization are registered. It has been found that the degradation of the coating affects the surface layers with a thickness of several layers. By changing the parameters of laser radiation it is possible to carry out rapid diagnostics and comparative tests of heat resistance of ceramic protective coatings obtained by different methods from different initial materials.
Investigation of the effect of the treatment of the surface of VT6 alloy on the penetration depth of implantable ions
Authors: Ovchinnikov V V , Luk’yanenko E V , Kurbatova I A , Yakutina S V 
Published: December 2020

Abstract
The article presents studies on the combined treatment of VT6 titanium alloy, including preimplantation treatment of the titanium alloy surface with a laser or plasma and subsequent modification with highly efficient energy flows using a copper and iron cathode. The beneficial effect of preliminary surface laser and plasma treatments of VT6 alloy parts as an operation of preparing the surface for implantation on the mechanical and tribological properties, as well as the penetration depth of the implanted ions in the surface of the VT6 titanium alloy, is shown. This work was carried out as part of the state task of the Ministry of Science and Higher Education of the Russian Federation «The influence of magnetic fields and ion implantation on the structure, chemical composition and properties of titanium, aluminum alloys and elementary semiconductors».
Investigation of the effect of ion implantation on the structure of the surface layer of VT20 titanium alloy
Authors: Ovchinnikov V V , Uchevatkina N V 
Published: December 2020

Abstract
The effect of ion implantation of VT20 titanium alloys on their structural and substructural characteristics is studied. A significant change in structural characteristics has been established, which contributes to an increase in the strength properties of alloys with satisfactory ductility and heat resistance. This work was carried out as part of the state task of the Ministry of Science and Higher Education of the Russian Federation «The influence of magnetic fields and ion implantation on the structure, chemical composition and properties of titanium, aluminum alloys and elementary semiconductors».
Anti-friction epoxy coatings modified with rice husk
Authors: Valeeva A R , Gimranova A R , Gottlieb E M , Galimov E R 
Published: December 2020

Abstract
This paper discusses the use of epoxy coatings modified with rice husk ash in order to reduce abrasive wear of materials and increase their durability during operation. It was experimentally established that the rice husk ash used as a filler increases the wear resistance and hardness of epoxy coatings with a significant decrease in the coefficient of static friction. This effect occurs when using ash obtained by burning rice husk at various temperatures. It is associated with an increase in the density of the formed spatial network in the presence of the studied filler, due to the selective sorption of the components of the epoxy composition by a developed solid surface.
On the necessity of organizational transformations in the system of repairing the mining equipment
Authors: Andreeva L I , Krasnikova T I 
Published: December 2020

Abstract
This article considers the methodological approach to the reorganization of the repair department of a mining enterprise (ME) into an independent structural unit, which provides the technical services (maintenance of the mining equipment) for the primary production of a mining enterprise. We consider the main reasons of inefficient activities of the repair department, justify the necessity of organizational transformations into one of the forms, which allows for a repair department to develop economic relationships with other units of an enterprise on the basis of mutual benefits. Also we describe the factors which are necessary to be taken into account when reforming the organizational structure of the repair department and provide a brief analysis of the preferability of directions of the technological specialization and the structure of main fuctions of the repair department. This approach will allow to make a well-grounded choice for the managers of an enterprise – either to repair the equipment with the help of a third party or to arrange the maintenance on its territory on the basis of providing a service and mutual benefits.
Modeling and calculations of mechanical characteristics of transport means
Authors: Kudryavcev Evgenij , Mollinedo Dipotet 
Published: December 2020

Abstract
Article describe processes of modeling and calculations of mechanical characteristics of transport means such as: traction forces; traction moments; traction powers,… fuel characteristics and represent their in analytic, graphic and numeric kinds with using of modern computer technologies. Complexity of such tasks is concluded in depending these characteristics from frequency of rotation of a crankshaft of motor on all gears. The proposed procedures of modeling and calculations allow to reduce time and costs of such calculations at least in several hundred times and effectively to carry out researches in any usage mode and exploitation of transport means, providing good visual presentation of received results.
Building a space for an analytic function that describes a spline curve
Authors: Tolok A V , Loktev M A , Sycheva A A 
Published: December 2020

Abstract
The article discusses some methods for obtaining the analytical expression of a Bezier curve and approaches to constructing analytically defined spline curves. A solution to the problem of constructing a functional region of a Bezier curve as its locally analytical description is proposed. The proposed solution is implemented through R-functional modeling (Rvachev function) and functional-voxel approach.
Probabilistic graph-theoretic models for dynamic and information capability problems research
Authors: Geyda Alexander S 
Published: December 2020

Abstract
We consider the system’s functioning such that this functioning is fulfilled according to the given network of operations (i.e., according to the provided plan) but can be alternated due to impact of the environment. The impact of the environment, results of operations in the network and thus system functioning results and the functioning alternations are characterized by random values. To systematize possible states during the network of operations, we propose a new type of graph-theoretic model—a Complex State-Transition Tree of Action Networks. Each node of the tree corresponds to the system’s state, and each branch to the possible system state transition and both may take complex form (Hypergraph of states and Network of actions respectively). Each possible workplace state corresponds to the possible operation or waiting for the operation’s realization at this workplace. Thus, the states of the tree of possible states corresponds to the network of actions (operations’) possible cuts. To create trees of possible states mappings to the networks of actions cuts, an algorithm to build such trees from networks of operations is suggested. It differs from a known algorithm of maximum network flow in that all possible cuts of the network and all possible states are modelled. It differs from a known algorithm of building all antichains of the partially ordered set (poset) in that the network of operations we consider may not constitute such poset.
Study of vertical milling machine layout in terms of rigidity
Authors: Khusainov R M , Sabirov A R , Ziangirova E R 
Published: December 2020

Abstract
The paper explores the signs of static elastic deformation when operating milling machines. The research is concerned with the issue of simulation of a machine-device-tool-workpiece system for preliminary evaluation of elastic deformation on treatment in order to eliminate rejects. Linear and angular deformations were defined. Total rigidity of a milling machine depends not only on its inherent stiffness and contact rigidity of its components, but also on geometrical characteristics of manufacturing system layout. These characteristics could be evaluated through axes of rigidity. Errors in surface machining depend on both tool deflection and workpiece distortion. That is why it is necessary to analyze workpiece and tool load-deformation curve separately. Especially that their rigidity is determined by different layouts of bearing system. Main deformation values are defined and vectors of axes of rigidity are created. Using the results of the analysis it is possible to select a cutting pattern or change manufacturing system layout so that the resultant of cutting forces comes closer to highest rigidity axis, which reduces elastic deformations and improves working accuracy.
Causes of cracks on the edges of the combustion chamber of the diesel engine piston
Authors: Gots A N , Klevtsov V S 
Published: December 2020

Abstract
Internal combustion engines operate in non-stationary operating modes, when the crankshaft rotational speed changes over wide ranges, not only the torque but also the angular speed changes. While transients occurring in the cylinder of an internal combustion engine during operating modes, especially for tractor diesels, are the most unfavorable for parts of the cylinder-piston group. Long cycle changes during which pressure, temperature, piston speed and heat transfer surface are constantly changing creates very difficult loading conditions. Moreover, the peak values of thermal powers through the heat exchange surfaces of the piston bottom in unsteady modes are 2 ... 2.5 times higher than the values at steady modes. High values of thermal and mechanical loads on the piston lead to cracks on the edge of the combustion chamber and premature destruction. Failure in pistons can be caused by mechanical and thermal loading, but thermal loads make the greatest contribution to the value of equivalent stresses. Therefore, cracks gradually develop, which often leads to a deterioration of the working process, and then to the destruction of the piston.