bluuebunny/crossref_metadata_2025_split huggingface dataset:
Towards consistent high quality of engineering products
Authors: Kushnarev L 
Published: November 2020

AbstractThe low level of competitiveness and the constantly growing requirements of consumers for modern domestic technology indicate an urgent need to improve the quality of technological machinery and equipment produced by engineering. Ensuring a competitive world-class quality of the produced machines and equipment requires innovative development and modernization of the production organizational and technological system of mechanical engineering. Only the association of modern engineering companies is able to unit and direct the efforts of all participants in the process of creating machines towards a stable, continuous improvement in the quality of equipment. Encompassing quality control at all stages of the life cycle of a machine, the company as soon as possible and without any special financial expenses ensures the highest world level of quality of engineering products.The goal of research is to comprehensively improve the quality of Russian-made machinery and equipment to the level of the best world analogues and higher based on the creation of an innovative production and technological system (complex), ensuring the as great as practicable level of quality of equipment at all stages of its life cycle.The results of feasibility studies show, that a non-competitive level of quality of domestic equipment has developed and is maintained, despite the efforts of manufacturers, due to the long-term maintenance of the existing manufacturing system and production relations, requiring urgent and accelerated modernization. The main disadvantage of the existing manufacturing system in mechanical engineering is the isolation and fragmentation of enterprises and institutions working on the creation of machinery and equipment, the incompleteness of the production and technological chain, the lack of engineering and technical support of processes at all stages of the life cycle and, first of all, at the stage of operation of equipment. Therefore, in this article, we consider and propose a complex of priority organizational and technological measures providing the accelerated innovative development of the manufacturing system and improve the quality of Russian equipment above the level of the best world analogues.
Choice of finishing and strengthening treatment method for cycloidal screw surfaces for multi-product production conditions
Authors: Akulinichev P , Zenin I , Goncharov A 
Published: November 2020

Abstract
Annotation. This work is devoted to the study of modern methods of finishing complex profile surfaces, in particular, considered cycloidal screw surfaces, typical for single-screw machines of volume type. The operating conditions of parts with cycloidal screw surfaces are analyzed. In the article the technical requirements provided in the process of finishing are identified, and a method and device for implementing the method of finishing in the conditions of automated multi-product production are offered.
Development of methods for calculating cutting modes when processing the internal cycloidal screw surface using the original method used in drilling
Authors: Albov M , Goncharov A 
Published: November 2020

Abstract
Annotation. In this paper, we consider the problems that arise when using screw volumetric machines when working with chemically aggressive media. To solve this problem, it was proposed to use a chemically resistant material of fluoroplast for the manufacture of screw machine clips. To implement the process of creating clips, the kinematics of methodagerotor drilling of cycloidal screw holes was proposed, and a method for calculating processing modes was developed.
Development Prospects of High-Vacuum Mechanical Pumps Using Magnetic Bearing Support
Authors: Ochkov A , Hamadi M 
Published: November 2020

Abstract
The analysis of existing high-vacuum mechanical pumps with magnetic suspensions is carried out. The schemes and algorithms used for calculations for permanent magnetic suspensions (PMS) and active magnetic suspensions (AMS) are presented. Based on the results of the analysis, the relevance of the use of magnetic suspensions in high-vacuum mechanical pumps was evaluated, the development prospects of high-vacuum mechanical pumps with magnetic suspensions were noted.
Heat Resistance of Nickel-Manganese-Molybdenum Steel with Boron-Nitride Hardening
Authors: Eremin E N , Losev A S , Borodikhin S A 
Published: November 2020

Abstract
The metal of a coating made of steel N8G6M3FTB, deposited by a flux-cored wire containing boron nitride, titanium diboride and zirconium diboride, was studied. The metal was subjected to surface oxidation at a temperature of 900 °C. It was found that the average weight gain of the metal scale of such a coating at 900 °C is 0.0087 kg/(m2-h), which is 2.24 times less than that of steel 30Kh2V8F. It was revealed that the basis of metal scale, along with hematite and magnetite, are compounds with good protective properties. The results obtained show that the coating of steel N8G6M3FTB alloyed by boride compounds can be used for applying on the surface of parts operating at high temperatures.
Wear Resistance Structural Aspects of Materials after Laser Processing
Authors: Brover A V , Brover G I , Topolskaya I A 
Published: November 2020

Abstract
The conducted experiments show that the structures generated by laser processing are able to dissipate friction energy effectively with transformations at different structure levels. Thus, it becomes possible to manage surface strength and wear resistance of materials using the concept of “structural adaptability” of friction pairs that expands the range of normal friction and wear processes. The irradiated steel wear resistance is defined by its original hardness as well as its ability to deformation strengthening during friction. The temperature and strength load of irradiated steel surface layers through friction destabilize austenite towards y-xx transformation. This results from alloy carbide formation which causes depleted austenite by carbon, and contributing to its transformation into martensitic deformation. It’s necessary to regulate the amount and degree of remaining austenite stability in laser-hardened steel and alloys, applied to specific load conditions, that provides that required operation features.
Martensite Nucleation under Conditions of Austenite Superplasticity and External Magnetic Field
Authors: Pustovoit V N , Dolgachev Yu V , Aref’eva L P 
Published: November 2020

Abstract
The thermodynamic conditions corresponding to the instability of the crystal lattice before the martensitic transformation are analyzed. The instability of the crystal lattice before the martensitic transformation can be crucial for the occurrence of such a phenomenon as superplasticity of the martensitic transformation. Phenomena arising in an instability state are considered, a theoretical analysis of possible structural states detected experimentally is carried out. The phenomenon of superplasticity of the martensitic transformation under tension in the Ms
– Md
interval and the effect exerted by the magnetic field in this interval are described. As a result of exposure to an external magnetic field in this temperature range, the resulting magnetostrictive stresses in ferromagnetically ordered austenite nanoclusters under superplastic conditions initiate the formation of martensite.
An Analytical Model for Calculation of the Steel Hardness after Continuous Cooling
Authors: Maisuradze M V , Ryzhkov M A , Lebedev D I 
Published: November 2020

Abstract
A number of modern engineering steel grades were analyzed using the CCT diagrams plotted by means of the dilatometer. The statistical analysis of the experimental data allowed for the determination of the equations connecting the critical cooling rate to achieve fully martensitic microstructure and the martensite hardness with the chemical composition of the steel. The dependence of the steel hardness on the cooling rate in the range of 0.1…30 °C/s was determined. It was shown that this dependence had the logarithmic character for every studied steel grade. The equations connecting the coefficients of the logarithmic function with the chemical composition of steel were obtained.
Graphical Representation Reliability of Experimental Data Concerning to Structural and Surface Properties of Substances
Authors: Mayorov D V , Gorbacheva T T , Velyaev Yu O 
Published: November 2020

Abstract
Using experimental data on the pore distribution of a sample of magnesium-aluminum layered double hydroxide, various variants of their graphical representation are analyzed. It is shown that graphical interpretation of the obtained data in the coordinates dV/dD – D (dV/dlog(D) – D) or V – D is not of practical (scientific) interest and may lead to incorrect conclusions about the predominance of pores of a certain diameter in the sample and other errors. It is concluded that to avoid possible errors and provide the most complete information about the pore distribution of the studied samples, the presented graphic materials should be supplemented with histograms of the pore distribution.
Kinematic Viscosity of Melt Prepared from an Amorphous Fe72.5Cu1Nb2Mo1.5Si14B9 Ribbon
Authors: Kochetkova Ye A , Starodubtsev Yu N , Tsepelev V S 
Published: November 2020

Abstract
In this work, the viscosity of a melt prepared by melting an amorphous ribbon of Fe72.5Cu1Nb2Mo1.5Si14B9 alloy was studied. The amorphous ribbon was produced by rapid quenching of the melt, which was preheated at a temperature above (overheated mode) and below (not overheated mode) critical temperature Tk
. A hysteresis loop was found in the temperature dependence of viscosity, the widest part of which falls on a temperature from 1670 K to Tk
= 1760 K. In this temperature range, the melt has the highest activation energy and the largest cluster size. It has been proven that the melt viscosity increases with decreasing cluster size. In the low-temperature region, an overheated melt has the highest viscosity and the smallest cluster size comparable to the atomic size. It is shown that the heredity of the structure is preserved in the melt from the amorphous ribbon despite a number of structural transitions.
Correlation between Iron Substitution Degree in the M-Type Hexaferrites Based Crystal Structures and Dopant Content in the Crystal Growth Feeding Melt
Authors: Zhivulin V , Zaitseva O , Vinnik D 
Published: November 2020

Abstract
In this paper the results of the investigation of the properties of the obtained crystals of hexaferrites grown from the sodium carbonate flux doped with 1 – 12 mass % of metal oxide (aluminum, titanium, manganese, cobalt, and copper) are presentd. The ratio of concentration of doping elements in the crystal and in the feeding melt has strong dependence on nature of dopant. Doping metals can be ordered in a line Ti > Al > Mn > Co > Cu where Ti has maximal ratio of 0.5 and Cu of 0.005. Hexagonal M type ferrites attract the reseachers interest due to great capacity for the accommodation of different metals at high doping levels that provides a possibility for wide tuning of physical properties by cation substitution.
Determination of Mechanical Characteristics Plasma Hardened Wheel Steel
Authors: Bogomolov A V , Kanaev A T , Sarsembaeva T E 
Published: November 2020

Abstract
A technique for measuring the mechanical properties of plasma-hardened wheel steel with nanoindentation is applied. The purpose of the work is to demonstrate and substantiate the serious differences between the mechanical properties and behavior of materials in nano-volumes from those obtained in traditional macroscopic tests. The features of measuring mechanical properties – hardness, Young’s modulus, elastic recovery – affecting the wear resistance of the surface layers of the material are given. Measurement of the physic mechanical properties of the material makes it possible to evaluate and select the optimal technology for surface modification by surface plasma hardening. It is noticed that the objectivity of determining the hardness, elastic modulus, elastic recovery and flow stress depends on the parameters of the measuring equipment used and strict adherence to the requirements for the imprint depth depending on the thickness of the hardened layer. The studies carried out on wheel steel samples from the rim and from the ridge of a railway wheel subjected to surface plasma hardening under the same conditions. The HV and H of the wheel rim are greater than the corresponding values of the flange, and the young modulus of the wheel flange, on the contrary, is greater for the flange.
The Effect of Temperature and Roasting Time on the Conversion of Zinc Ferrite to Zinc Oxide in the Electric Arc Furnace Dust
Authors: Ryazanov A G , Senin A V , Kornilov N A 
Published: November 2020

Abstract
The dust of electric arc furnaces (EAF-dust) contains significant amounts of zinc in the form of various chemical compounds. Therefore, dust can be used as a raw material for zinc extraction. EAF-dust containing 20 wt.% Zn has been studied. The effect of dust roasting with Ca O and Na2CO3 additives on the degree of conversion of ZnFe2O4 to Zn O was studied experimentally. The effect of the roasting temperature of 700, 850 and 1000 °C and the roasting duration of 1, 2 and 3 hours were established. Ca O and Na2CO3 additives in dust contribute to the destruction of ZnFe2O4 due to the formation of Ca2Fe2O5 and NaFeO2. After treatment, zinc is presented in the form of acid soluble zinc oxide. The content of acid-soluble zinc increases from 25% in the initial dust to 97 – 98% in the roasting product (“cinder”) under optimal roasting conditions.
Effect of External Integrated Treatment on the Structure and Properties of the Castings from Steel Grade 35L
Authors: Efimov A V , Potapov M G , Kuts N A 
Published: November 2020

Abstract
The methods of influence of external physical and thermophysical factors on the cast steel structure formation are considered in the paper. High-temperature processing of the melt is an effective method of heat treatment. It improves a wide range of mechanical and operational properties of finished castings. The parameters of high-temperature treatment were established experimentallyin the course of this study. Its influence on the structure and properties of 35L steel castings has been shown. The usage of a nanosecond electromagnetic pulse during the crystallization of a casting in the mold is a method of dynamic action on the metal liquid phase. The parameters of nanosecond electromagnetic pulse processing during crystallization were determined by the technical capabilities of the electromagnetic pulse generator.
The study of the properties and structure of samples cast from a melt processed by electromagnetic pulses confirms the improvement of the mechanical and operational properties of castings by improving the primary cast metal structure. The influence of metal overheating, nanosecond electromagnetic pulse, and temperature-time holding on the structure and mechanical properties of castings is revealed. The modes of thermal holding (final technological heat treatment of the metal) were determined experimentally using the method of differential scanning calorimetry. The paper presents the results of changes in improving the properties of cast products due to the use of optimal modes of external complex influences.
Simulation of Physical Fields in Induction Hardening Technology - from Digital Twin to New Technology
Authors: Perevalov Yu , Demidovich V 
Published: November 2020

Abstract
A new technology for the final induction heat treatment of large mill rolls has been developed. When designing this technology, installation and control system, a digital twin of the system was created on the basis of combined numerical models of electromagnetic and temperature fields in cylindrical axially symmetrical systems. The final heat treatment of mill rolls consists in a two-stage, multi-frequency induction hardening of body of large rolls. The developed digital twin of the system allows one to evaluate the key features arising during induction hardening, such as temperature distribution, hardness of the hardened layer, stresses that arise during hardening. The design of induction systems through digitalization allows one to improve the design, equipment composition and heat treatment mode to achieve maximum quality and minimize energy costs.
Obtaining of Pigment-Quality Magnetite from Sintering Process Red Mud
Authors: Shoppert A A , Loginova I V , Napol’skikh J A 
Published: November 2020

Abstract
The limited availability of high-quality bauxite and, at the same time, the formation of a considerable amount of harmful red mud (bauxite residue) causes to develop cost-effective technologies for bauxite processing. Selective separation of iron from red mud allows solving this problem and producing marketable products in the form of pigment-quality magnetite. In this context, the possibility of the pigment-quality magnetite obtaining by the interaction of freshly precipitated iron hydroxide (III) of the sintering process red mud with ferrous iron ions in an alkaline medium is studied. It was found that the optimal parameters of the process are: temperature = 90°C; duration = 4 hours; a ratio of ferrous iron to stoichiometric quantity = 70 %. The yield of the magnetic concentrate under optimal conditions was 69.3 %, and the content of magnetite in concentrate was 47.7 %.
Study of the Manufacturing Options for an Asymmetric Plate Made of 12X18N10T Steel
Authors: Shimov G V , Bushueva N I 
Published: November 2020

Abstract
The analysis of possible options for manufacturing an asymmetric plate of 12X18N10T steel is presented. A phenomenological model of damage accumulation was used to analyse the probability of metal micro – and macro – destruction. The results of FEM modelling of technological processes of plate manufacturing are presented. Due to these results were made the conclusions about feasibility of their application based on the metal damage calculation. The choice of a rational technology to produce a plate is justified, in which the greatest metal ductility reserve takes place at a dangerous point. According to the proposed scheme, an experimental batch of plates have been made.
Computer Simulation of the Metal Deformation Process in an Equal Channel Step Matrix with Additional Backpressure
Authors: Naizabekov A , Lezhnev S , Panin E 
Published: November 2020

Abstract
Theoretical studies of the process of round cross-section billets pressing in equal-channel step matrices of various designs by modeling are carried out. It was found that the backpressure created by the narrowing of the matrix channels has a favorable effect on the stress-strain state of the metal, which in turn allows for better processing of the structure of the deformable metal. It is also found that when using an equal-channel step matrix with narrowing channels, the deformation force increases, which cannot be attributed to the positive sides of these matrix designs. It was found that the most optimal results were obtained when using an equal-channel step matrix with a narrowing of the intermediate channel.
Laser Powder Cladding Complex: Principles of Advanced Automated Control
Authors: Chkalov R V , Chkalova D G 
Published: November 2020

Abstract
Currently, the laser powder cladding process is one of the most promising methods for producing wear and corrosion resistant sealing surfaces of high hardness. To solve the problem of high-quality automated production of coatings, that meet specified requirements, on the surfaces of critical parts, it is necessary to identify key factors, as well as determine the contribution of each of them in the process of laser powder cladding. In view of the foregoing, the urgent task is to develop an integrated system that allows monitoring and recording parameters of ongoing physical processes, as well as ensuring reproducibility of experimental results. Since such an installation includes many disparate technical units and transition modules of various integration levels, each of which has its own functionality, a specialized software package has been developed, the purpose of which is to combine individual components into a single organized and controlled system. As an approbation of the experimental complex work, the results of laser cladding process are shown.
Process Design for the Wire Arc Additive Manufacturing of a Compressor Impeller
Authors: Kulikov A A , Sidorova A V , Balanovskiy A E 
Published: November 2020

Abstract
Additive manufacturing or 3D printing slowly and steadily replaces traditional subtractive manufacturing, where parts are manufactured by sequentially removing pieces of the workpiece material. In 3D printing, the material is added in layers, which enables producing parts of complex geometric shapes made from expensive metals with higher productivity and economic efficiency. In order to perform 3D printing on an industrial scale, it is necessary to combine robotics with 3D printing software. This article presents the results of the process design for 3D printing of a compressor impeller prototype. A detailed methodology of customization of the KUKA industrial robot for the 3D printing process is given. Once the impeller model was created in the CAD environment, it was cut into layers in the slicer program. Special software for offline programming of industrial robots was used to translate the program into the robot language and perform 3D printing using an experimental robotic complex. As a result, a prototype of a low-carbon steel compressor impeller was printed using a welding machine and steel wire. The developed technological process was successful and proved that an industrial robot combined with a welding machine can be used as an industrial 3D printer for printing real machine parts.
Investigation of the Effect of the Lighting Step on the Strength of a Ceramic Product in 3D Printing
Authors: Yerezhep D , Piterskov P , Pobirokhin G S 
Published: November 2020

Abstract
The subject of this study is to assess the effect of such a 3D printing parameter by the SLA method as the lighting step (the distance between the lines of the beam motion when lighting the layer) on the mechanical properties of a ceramic object. For the study, the lighting step of 50 μm, 75 μm and 100 μm was used. The dependencies such as the Mises stresses, the displacements of the layers of the printed object relative to each other, and also the pressure arising in the layer were compared. To exclude edge effects, dependences were evaluated in the range from 500 μm to 1500 μm of the surface of the object layer, the layer thickness was 100 μm. These studies are necessary to optimize the 3D printing process, to minimize internal stresses and pressures in the printed object. The use of optimal printing parameters will improve the results of heat treatment and obtain objects with the required surface quality.
Enhancement of Deposition Process Controlling in Electron Beam Metal Wire Deposition Method
Authors: Shcherbakov A V , Rodyakina R V , Klyushin R R 
Published: November 2020

Abstract
The urgency of improving control systems for electron beam metal wire deposition method is proved in terms of creating methods for controlling the geometric parameters of deposited layer. It is shown that to solve this problem in electron beam metal wire deposition method, it is advisable to use reflected electron signal detection when scanning the deposited layer. Using a mathematical model based on the application of continuous loss approximation and Monte-Carlo method, the probe characteristics recorded during cylindrical layer scanning are investigated. Experimental verification of the results obtained was carried out using an electron-beam technological installation. The effect of the distance between the layer and electron collector on the recorded signals is investigated. The possibility of using this method for simultaneous control of deposited layer height and width is shown.