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CONSTRUCTIONAL MATERIALS, PHYSICAL METALLURGY

Saraev Yu. N., Bezborodov V. P., Perovskaya M. V., Semenchuk V. M. — Modification of the coating structure by using the T-590 and EN-60Ì electrodes on products from 09G2S, St.3 and 12Kh18N10T steels, during depositing in the mode of low-frequency current modulation

The paper studies the influence of the modes of arc welding electrodes T590 and EN-60M on the properties of coatings of unalloyed, low-alloy and alloy steels: St. 3, 09G2S, 12H18N10T.
The influence of electric arc influence on the structure, physical, mechanical and operational properties of coatings deposited with T590 and EN-60M electrodes was studied.
It is established that this modification allows to increase the uniformity of the structure of the deposited coatings, to grind it, to increase the hardness and corrosion resistance.
It was found that the application of the method of pulsed arc welding allows to keep the previously formed strengthening phases in the coatings deposited by the electrodes T-590 and EN-60M.
Key words: electric arc deposition, properties of coatings, welding seam hardness, mechanical properties of a welded joint, structure of a welded joint

BLANK PRODUCTION

Mikhalchenkov A. Ì., Feskov S. À., Kozarez I. V., Torikov V. E. — The effect of thermal hardening and alternating operational loads of 65G steel on the microhardness of the area depositeds by a low-carbon electrodes

The distribution of microhardness in the cross section of the depositing region by a low-carbon electrode has a complex configuration, which is resulting from a variety of structural and phase components, the presence of elastic-plastic deformations, and the presence of preliminary thermal hardening of the base metal. The microhardness of the surface of the deposited metal is 410 Hv, which provides increased wear resistance of the friction surface. Operational alternating loading have not influence on the microhardness and structure of the deposited region.
Key words: heat hardening, alternating loading, 65G steel, microhardness, deposition, low-carbon electrode

TECHNOLOGIES AND EQUIPMENT FOR MECHANICAL AND PHYSICOTECHNICAL PROCESSING, PRESSURE TREATMENT

Chudin V. N. — Pressure welding — gas forming of the laminar thermal panels

The technology and calculation of the production modes of thermopanels by welding with pressure and gas forming channels at one processing position are given. The material of the blanks is creep-plastic in conditions of isothermal deformation. The operationg sequence entering into the process is given. The samples of products are presented.
Key words: stiff-plasticity, creep-plasticity, power, pressure, time

TECHNOLOGIES AND MACHINES FOR WELDING PRODUCTION AND RELATED PROCESSES

Kolomeychenko A. V., Kuznetsov I. S., Kravchenko I. N. — Investigations of electrospark coatings obtained by electrodes from amorphous and nanocrystalline alloys

The paper presents the study of thickness and microhardness electrospark coatings of amorphous and nanocrystalline alloys. Found that the use as electrode materials of amorphous and nanocrystalline alloys improves thickness electrospark coatings obtained with this coating possess a high microhardness.
Key words: electrospark deposition, electrospark coating, amorphous alloy, nanocrystalline alloy, thickness, microhardness

SPECIAL TYPES OF TECHNOLOGIES

Ponomarev I. S., Krivonosova Å. À., Gorchakov A. I. — Investigation of discharge dynamics during microarc oxidation of an aluminum alloy D16

The microarc discharge features at microarc oxidation (MAO) of the aluminum alloy Dl6 are researched. Forming phases of the microarcs on the sample surface for work with regulated condensing power supply by the AC frequency of 50 Hz are shown by means of a high speed video filming.
Key words: microarc oxidation, alternating current, adjustable condecing power supply, a thyristor power supply, high-speed filming, aluminum alloy D16, cathode and anode modes

Kudelina E. S., Vyatkin A. G. — An experimental study of the bearings wear with a spherical surface

The article discusses the impact of factors on the wearout of supports with a spherical surface. For a comprehensive evaluation of the wearout value, single-factor and full-factor experiments were planned and carried out. Their results made it possible to assess the degree of influence of each of the factors, and also to calculate the coefficients that allow us to determine the amount of wearout through a finite number of installations for their timely repair or replacement.
Key words: tooling, wearout supports with a spherical surface, error caused by wear of installation elements

MACHINE-TOOL AND CUTTING TOOLS PRODUCTION

Zhetesova G. S., Yurchenko V. V., Nikonova T. Yu., Zharkevich Î. Ì., Modelina E. D. — The basing specifics at the accuracy controlling of the machine-tool-accessory-tool-part system 

The authors raise the question about existence of correct determination methods for the basing schemes assigning, installation schemes, and the processing route for the workpiece due to imperfection of the GOST 21495—77 propositions. Therefore, own methodology for compiling basing options based on a mathematical description of the basing stages at the designing of technological processes for the machine—tool—attachment—tool—workpiece system is offered.
Key words: basing system, technological process, accuracy, machining

METHODS OF CONTROL AND DIAGNOSTICS

Rogov V. A., Koshelenko A. S., Zhed O. V. — Investigation by the method of photomechanics on optical flat models of the stress intensity in geometric heterogeneities of the crankshaft necks from the working loads of internal combustion engines (ICE)

The methodology of determination the intensity of contour tension in the oil passage hole caused by the load of the journals of the crankshaft, resulting in a running cycle of an internal combustion engine, the physical modeling in optical flat model by photomechanics method.
Key words: crankshafts, photomechanics, intensity of tension, bend, torsion

MATHEMATICAL MODELING, NUMERICAL METHODS, PROGRAM COMPLEXES

Kim V. A., Samar E. V., Yakubov Ch. F. — Mathematical modeling of the chip formation deformation processes during metal cutting

Plastic deformation of the cut layer is of a stage nature, associated with the accumulation of elastic energy of deformation in a certain volume and its discharge during plastic shear. The result of this process is the formation of a fragmented chip element.
Contact-friction interaction during metal cutting is also of a stage nature, associated with the formation of adhesion bonds and their destruction. This process determines the dynamics of development of the element in the formation of elemental chips.
In mathematical modeling of finite element metal, deformation hardening of the material is represented by a finite element mesh splitting algorithm. When the initial grid reaches a certain critical degree of distortion, the algorithm starts a new breakdown of the grid and a smaller cell. This procedure improves the elastic properties of the material and its modulus of plastic deformation, and this leads to an increase of the power parameters of the process of the chip formation, the change of position of the plane of shear and the instantaneous velocity of chip flow.
Dynamic processes of chip formation and contact-friction interaction determine dynamic disturbances in the technological system of machining. In this case, high-frequency disturbances are associated with the development of fragmented elements, and lowfrequency — with the element links of the chip.
Key words: metal ñutting, cutting wedge, front surface, chip, shear angle, deformation, cutting speed, fragmented element, element link

AUTOMATION OF THE TECHNOLOGY PROCESS TECHNOLOGY AND PRODUCTION, ÑÀÏÐ

Ismagilov F. R., Yangirov I. F. — Taco-generator with longitudinal slots and bevel on the rotor

In this paper, we study the accelerometer capable of operating in the tachogenerator mode, and which can be used in instrument engineering, engineering due to its versatility, improved metrological characteristics and simplification of the manufacturability of the manufacture of the system "tachogenerator—accelerometer". The paper solves the problem of determining the output characteristic of the new design of the tachogenerator taking into account the bevel of the longitudinal slots for the possibility of creating engineering methods of calculation and optimization solutions. The results of the work can be used by designers and operators of such purpose of automation elements.
Key words: accelerometer, rotor, conductive, slots, Reynolds magnetic number

STANDARDIZATION, QUALITY PRODUCTION MANAGEMENT

Budkin Yu. V., Dokukin A. V., Kvasnitskiy V. N., Garin A. V., Geletiy A. N., Zlydnev M. N. — Current state and standardization prospect of new production technologies in machine building 

The article discusses the current state and prospects for the development of standardization of new production technologies in mechanical engineering. The level of provision with standards and the intensity of their use by Russian enterprises have been established. The main problems associated with the development of standardization are identified: the risks of using foreign standards, the lack of copyright protection of domestic innovators. The prospects for improving the fundamental standards providing a more intensive development of standardization of new production technologies are described.
Key words: new manufacturing technologies, standardization, patent, digital economy

FOREIGN EXPERIENCE

Potapova G. S. — Content of foreign journals

INFORMATION

Results of the international Polytechnic exhibition "Equipment and technologies for processing structural materials" "TECHNOFORUM-2019"

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