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TECHNOLOGIES AND EQUIPMENT OF MECHANICAL, PHYSICAL AND TECHNICAL PROCESSING, PRESSURE TREATMENT

DOI: 10.34641/TM.2022.238.4.022
Bezmaternykh S. A. — Experience in the introduction of high-speed processing (HSS) at the FSUE "Votkinsky Zavod" 

The main aspects of the VSO strategy are considered, which improve the surface quality of the part and increase tool durability compared to classical processing, even at low feed rates and speeds of the cutting tool.
Key words: tool life, feed and speed of the cutting tool, high-speed processing

TECHNOLOGIES AND MACHINES OF WELDING PRODUCTION AND RELATED PROCESSES

DOI: 10.34641/TM.2022.238.4.023
Bazdnikina E. A., Suchkov A. N., Sevryukov O. N., Samokhin A. V., Alekseev N. V., Fadeev A. A., Sinaisky M. A. — Comparative study of spherical solder powders VPr27 and VPr50 obtained by methods of gas atomization and plasma spheroidization of fast-quenched fragmentation-type particles

The paper presents a new technology for producing powders of high-alloyed nickel alloys with a high degree of sphericity of powder particles with a size of 40—63 microns.
The comparison of the basic properties of nickel-based alloys-solders of grades VPr27 and VPr50 obtained by gas atomization and according to the proposed technology. The production process of spherical powders is implemented through the stages of ingot manufacturing, obtaining a quick-tempered amorphous tape with its subsequent heat treatment, production of a fragmentation-type powder, separation of a particle fraction with a size of 40—63 microns, spheroidization of the isolated fraction in a flow of argonhydrogen thermal plasma. At the same time, the sphericity of the obtained powders reached 99 %. The technological characteristics of such a powder — fluidity and bulk density, were improved by 25 and 10 %, respectively.
Key words: metal powders, nickel alloys-solders, plasma spheroidization, gas atomization, ultrafast quenching, heat treatment, high-alloy alloys, sphericity

MATHEMATICAL MODELING, NUMERICAL METHODS, SOFTWARE PACKAGES

DOI: 10.34641/TM.2022.238.4.024
Sedinin I. N., Makarov V. F. — Calculation of a mathematical model of deviation from the flatness of the treated surface during end milling of hardened high-carbon steel

In order to ensure the technical requirement for the machined surface — deviation from flatness, research of face milling on samples from hardened steel was carried out using the method of mathematical planning. In the experiments, a machine of increased accuracy, a carbide cutting tool and a high-precision measuring tool were used.
When determining the dependent variable, a full factorial experiment was set up with three independent variables: cutting speed, feed per tooth, and depth of cut. To determine the coefficients of the polynomial regression equation, a second-order central compositional orthogonal design was used. The matrices of the levels of variation of independent variable factors and the planning of the experiment were made A regression analysis of the obtained experimental data was performed using Microsoft Excel, Wolfram Alpha and Statistica programs. As a result of calculations, a mathematical model of the deviation from the flatness of the treated surface was found and the significance of the variable factors influencing the response function was determined.
Key words: face milling, hardened steel, deviation from flatness, hard alloy, mathematical planning, response functions, independent variables, full factorial experiment, polynomial regression, variation levels matrix, planning matrix, regression analysis, mathematical model

AUTOMATION AND CONTROL OF TECHNOLOGICAL PROCESSES AND PRODUCTIONS, CAD

DOI: 10.34641/TM.2022.238.4.025
XIAO Jesiao — Application of watchdog mechanisms in embedded computing systems

The paper discusses the issues of using watchdog mechanisms in embedded computing systems: what functions they perform in the operation of embedded computing systems, what methods are used to detect existing errors made, how to improve the efficiency of the functioning of watchdog mechanisms within systems of this type, what problems are observed in the implementation of watchdog mechanisms. In the final part, the issue of the lack of specialized tools for automating the process is considered, which would allow, based on the specified criteria, to integrate watchdog mechanisms into the hardware and software system, which opens up prospects for further research.
Key words: embedded systems, computing systems, watchdog mechanisms, timers, processors, functionality

STANDARDIZATION AND PRODUCT QUALITY MANAGEMENT

DOI: 10.34641/SP.2021.1043.10.044
Makarov G. I., Kapustin O. E. — Expansion of technical requirements for welded pipes for trunk pipelines when updating state standards

The article scientifically substantiates proposals for expanding the technical requirements for main pipelines welded pipes. It’s proposed, when updating state standards for pipes, to expand the range of high-strength pipes allowed for use, take into account the differentiated requirements for the CTOD fracture toughness index, add a section of requirements for the pipe metal dynamic fracture toughness for main gas pipelines, as well as for pipelines subjected to pneumatic testing.
Key words: crack resistance, welded pipes, main pipelines, regulatory requirements, updating state standards

LABOR PROTECTION

DOI: 10.34641/TM.2022.238.4.026
Ignatova A. M., Ignatov M. N., Feinburg G. Z. — Classification of microspherical particles of the solid component of welding aerosols formed during manual arc welding with coated electrodes

The development of occupational diseases of welders is largely caused by the solid component of welding aerosols (SCWA), which consists of fine particles of different composition and structure, 40—50 % of all SCWA particles in manual arc welding of ferrous and non-ferrous metals are represented by spherical formations of various structures, shapes and composition. The classification of microspherical particles formed during manual arc welding with coated electrodes was analyzed, as a result it was found that the main criterion for it is not the morphology but the composition, so the composition of the SCWA particles includes mesoporous hollow particles, container, multilayer varieties of them and formations with the "particle in particle" structure. ". The formation of particles, as shown by a detailed study, is due not only to condensation, but also to the flotation processes of gases in the melts of the weld pool. Particles are connected to each other forming agglomerates, and at the initial stage, the coalescence process predominates, and only after that it can turn into coagulation. Agglomerates have a complex structure, channels are formed between the particles in which reduction takes place, the agglomerate itself is "overgrown" with an oxidized layer, and mesoporosity is reduced inside the particles.
Key words: classification of microspherical particles, manual electric arc welding, particle morphology, container and multilayer particles, formations with the "Particle in particle" structure

ECONOMICS OF MECHANICAL ENGINEERING, ORGANIZATION OF PRODUCTION

DOI: 10.34641/TM.2022.238.4.027
Egorov M. K., Feofanov A. N. — Updating of regulatory and technical documentation of a machine-building enterprise on the example of the advertising department 

Mechanical engineering is an industry that produces machines for various purposes, from general consumer goods to the defense industry. It is a leading cross-industry complex operating in Russia. The products of the machine-building industry are used at all enterprises to increase labor productivity through the introduction of equipment. The development of the machine-building industry includes: the import of equipment, the introduction of the latest technologies and the development of technologies of domestic production.
Key words: automation, quality, document management, standardization, complaint, decision tree

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