International Scientific Journals
of Scientific Technical Union of Mechanical Engineering "Industry 4.0"

Table of Contents

• MACHINES

  • Evolution of rolling bearing life rating through the standardization

    • Tatjana Lazović
    • Ivana Topalović

    pg(s) 222-225

    • Abstract
    • View Article
    •  Article PDF

    The operational ability of a rolling bearing selected for a specific application is assessed based on service life. The basic formula for bearing rating life was established more than 70 years ago by A. Palmgren. The first standard presenting a basic mathematical model for rating life calculation was published in 1962 (ISO/R281). The content of this standard has been revised and the next version was published in 1977 (ISO 281-1). The novelty was the introduction of adjustment factors for reliability other than 90%. This standard was replaced by the ISO 281 standard in 1990, which introduced additional adjustment factors for special bearing properties and operating conditions. The latest version of the ISO 281 standard was published in 2007. This standard provides a procedure for calculating the modified service life by taking into account the additional impacts of lubrication condition, lubricant contamination and limit fatigue load. Furthermore, the document ISO/TS 16281 was published in 2008 introducing the influence of bearing internal clearance and misalignment in the rating life calculation. An overview of the development of a standardized formula for bearing rating life is given in this paper, on the example of deep groove ball bearing under radial operational loading.

  • 3-phase motor speed regulator based on microcontroller and intelligent power driver controller

    • Stefanov G.
    • Cekerovski T.
    • Citcuseva Dimitrova B.
    • Stefanova S.

    pg(s) 226-229

    • Abstract
    • View Article
    •  Article PDF

    This paper describes the design and practical implementation of speed controller for 3-phase induction motor based on ATmega 2560 microcontroller. Based on the theoretical analysis of the induction motor, are defined the requirements that the controller should satisfy them. Then, based on the specificity of the selected controller, the operating mode of the ATmega 2560 controller is designed. The specificity of this solution is that the driver circuit, which is connected between the controller and the motor, is realized with an intelligent power controller. Finally, the results of the practical work of this motor controller are given.

• TECHNOLOGIES

  • Evolution of creative thought with elements of artificial intelligence on example of synthesis of clamping mechanisms

    • Kuznetsov Yuri

    pg(s) 230-236

    • Abstract
    • View Article
    •  Article PDF

    History of gradual increase of elements of artificial intelligence is resulted in the process of creative thought at creation of on principle new structures and charts of clamping cartridges on the example of cangovykh. Thinking process on on the lasts of peat-time of application of artificial intelligence presented as a binary koda and waves of frequency impulses, reminding cerebration.

  • Stress-strain state of workpiece from Cu-Cr alloy processed by severe plastic deformation by ECAP

    • Asfandiyarov Rashid
    • Aksenov Denis
    • Raab Georgy

    pg(s) 237-239

    • Abstract
    • View Article
    •  Article PDF

    The aim of this work is to study the stress-strain state and thermal effect in a workpiece from low-alloyed Cu-0.6Cr bronze under conditions of intense plastic deformation by equal-channel angular pressing (ECAP). To do this, physical modeling of the sedimentation of the samples was carried out on a Gleeble 3500 installation at temperatures of 20, 400, and 800 ° C and strain rates of 3, 30, and 300 mm / s. Based on the data obtained, a computer simulation of the process of ECAP was carried out in the Deform 3D software package. As a result, the fields of stress distribution, deformation, temperature (deformation heating) and power characteristics of the ECAP process are obtained, depending on various initial temperature and speed conditions.

  • Remote real-time control of autoclave sterilization process

    • Stoyanka Madzharova
    • Rosen Gerasimov
    • Adriana Prodanova
    • Hristo Dinkov

    pg(s) 240-242

    • Abstract
    • View Article
    •  Article PDF

    The article proposes a variant for real-time sterilization process control from anywhere in the world, based on the widespread communication protocol RS-232 or RS-485.

  • Model for high-pressure water atomization of metal melt using a vortex type jet

    • Ternovoy Yu.
    • Bagliuk G.
    • Panova V.

    pg(s) 243-246

    • Abstract
    • View Article
    •  Article PDF

    In this paper the physical model for high pressure water atomization of metal melts using hydraulic nozzle of a vortex type was proposed. The developed model assumes, that due to high speed water flow with significant centrifugal component of its velocity vector the rarefaction is formed, which causes intensive air suction leading to the formation of rotating gas (vapor-air) layer of toroid-like shape, providing a gap between the water flow and the metal stream. Thus water stream is separated from the heated surface of metal stream and the formation of particles during crystallization of melt droplets occurs due to surface tension mainly in this vapor-air layer. The cooling of melt droplets in the gas-water leads to the formation of spherical powder particles. The proposed model correlates well with the known experimental data on the production of spherical powders using a vortex-type annular hydraulic nozzle.

• MATERIALS

  • Structure and properties of microarc oxide coatings on high-temperature aluminum alloy

    • Valeriia Subbotina
    • Oleg Sobol

    pg(s) 247-250

    • Abstract
    • View Article
    •  Article PDF

    To create a high-hardness and wear-resistant coating on the heat-resistant aluminum AK4 alloy, the technology of microarc oxidation is used. The possibility of forming an oxide layer on the surface (mainly of α−Al2O3 and γ−Al2O3 phases) with a thickness of about 150 μm and a hardness of 17000 – 18000 MPa is shown. For this, the process of microarc oxidation was carried out at a current density of 20 A/dm2 in an electrolyte of the composition KOH (1-2 g/L) and Na2SiO3 (6-12 g/L). The obtained properties of MAO coatings on the AK4 alloy make it possible to effectively use such materials for engine elements.

  • Layered composites based on niobium with silicide-carbide or silicide-boride hardening

    • Korzhov Valery Polikarpovich
    • Kiiko Vyacheslav Mikhailovich
    • Prokhorov Dmitry Vladimirovich
    • Zheltyakova Irina Sergeevna

    pg(s) 251-254

    • Abstract
    • View Article
    •  Article PDF

    The work is devoted to the development of a solid-phase technology for obtaining high-temperature layered composites from Nballoys. The following are presented: one of the options for the formation of the initial multilayer package and its diffusion welding (1), the microstructure of the obtained composites (2) and the results of testing composites (3) for strength at room temperature and temperatures up to 1350°C, taking into account the structure anisotropy, crack resistance and tests for creep with two options for processing the obtained experimental data.

  • Hydrophilized unsaturated polyester resin based on a two-component system of sulfur and cement

    • Cherkezova R.
    • Hristova Т.
    • Zafirova K.

    pg(s) 255-257

    • Abstract
    • View Article
    •  Article PDF

    This work develops a multicomponent system comprising unsaturated polyester resin (UPER) hydrophilizing a two-component system of sulfate-resistant cement (SC) and sulfur, diluent water and a redox system. The hydrophilized unsaturated polyester resin (HUPER) so obtained can be used as a basis for polymer-silicate composites with good strength properties, precise embossed printing on the surface of various molds, and good visual characteristics. Polymer-silicate compositions with low and high content of SC were selected, and the constant amount of SC in the two groups obtained corresponded to a gradual change in sulfur content. Time kinetic dependencies of the cross-linking process of unsaturated polyester at a given amount of redox system were monitored. Reproducibility of results for different polymer compositions was achieved thereby enabling a possibility to predict them.