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

Table of Contents

• MACHINES

  • CHARGING STATIONS FOR ELECTRIC VEHICLES – TECHNICAL FEATURES AND TRENDS

    • Rachev S. R.
    • Koeva D. Y.
    • Dimitrov L. D.

    pg(s) 474-480

    • Abstract
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    One of the prerequisites for achieving the long-term goal of better atmospheric air quality is the transition to a low carbon economy and more sustainable transport through the increased use of electric vehicles. Statistics show that transport generates over 14% of global greenhouse gas emissions and is the main sector in the EU where this indicator is still increasing.
    Electric vehicle technology is constantly evolving and they are gaining in efficiency. Generally, electromobility is about charging, managing and using energy. The success of the automotive industry in the future will be determined by how quickly the development of traction motors and batteries will continue, as well as the charging infrastructure.
    In order to ensure the normal operation of electric vehicles, it is necessary to build an adequate infrastructure of charging stations. The paper deals with the technical features and trends of charging stations for electric vehicles. The results are a summary and assessment of extending the boundaries of electromobility, contributing to a more sustainable future. Relevant conclusions have been done.

  • RESEARCH WORK ABOUT THE TROUBLE-FREE OPERATION OF A ROBOTIC CELL FOR THE WELDING OF THE BOGIE FRAME ON A FREIGHT WAGON

    • Edrev St.
    • Topalova M.

    pg(s) 481-483

    • Abstract
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    This research work presents the results of the monitoring on a robotic cell operation for welding the bogie frame on a freight wagon for two months. The structure of the robotic welding cell is revealed and a register of the occurred failures was formed. A statistical processing of the received information has been made and an analytical expression about the trouble-free operation has been determined. Recommendations for increasing trouble-free operation are suggested.

  • IMPROVEMENT OF GROUND PUMPS FOR TRANSPORT OF SLURRY

    • Seitkhanov A.
    • Povetkin V.
    • Bukayeva A.
    • Ivanov S.

    pg(s) 484-486

    • Abstract
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    The analysis on improvement of soil pumps which are used in the ore-dressing enterprises of the Republic of Kazakhstan is provided in article. As a result of the analysis of operation of soil pumps it is revealed that soil pumps, don’t meet modern requirements in reliability and power consumption, and possibility working parameters adjustment. The main shortcomings of soil pumps is low life cycle of flowing part components. At the moment the main solutions to increase operational resource of soil pumps are — decreasing of cavitation processes; reduction of hydro abrasive mixture flow in the impeller cavity, that will reduce surface wear of impeller elements and increase pump inlet capability; For pulp pumping – reduction of vibration influence both of hydro abrasive mixture and pump overall; Slurry solids extraction prior to its inflow into the cavity of the impeller and its blades. The following Innovative technologies for improvement of soil pump operational life and wear reduction of impeller parts surfaces were provided.

• TECHNOLOGIES

  • KINETIC MODELS OF NICKEL LATERITE ORE LEACHING PROCESS

    • Petrovski A.
    • Načevski G.
    • Dimitrov A. T.
    • Paunović P.

    pg(s) 487-490

    • Abstract
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    The subject of this study is leaching process of nickel-bearing laterite ore from Ržanovo, R. Macedonia. The influence of sulfuric acid concentration (0.5, 1 and 3 M H2SO4) on the extracted Ni (%, wt.) was studied. The leaching process intensified by magnetic stirring at different temperatures (298, 323, 348 and 363 K) in the time interval of 120 min. was performed. The results were used for kinetic analysis of the leaching process. It was found that for 3 M H2SO4, the best fitting has shown the Jander and Ginstling-Braunshtein models, which point out that limiting step of the process is diffusion. Activation energy was calculated to be 42,67 kJ·mol–1 (Jander model) 40,28 kJ·mol–1 (Ginstling – Brousthein model), which confirm the diffusion controlled process.

  • OPTIMIZATION OF CUTTING PARAMETERS FOR MINIMIZING SPECIFIC CUTTING ENERGY AND MAXIMIZING PRODUCTIVITY IN TURNING OF AISI 1045 STEEL

    • Sredanović B.
    • Čiča Đ.
    • Tešić S.
    • Kramar D.

    pg(s) 491-494

    • Abstract
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    This paper presents an experimental study related to the optimization of cutting parameters in roughing turning of AISI 1045 steel under flooded conditions. The aim is to find a suitable combination of cutting parameters (cutting speed, depth of cut and feed rate) that minimize specific cutting energy and maximize material removal rate. The machining experiments were performed based on the Taguchi L27 full-factorial orthogonal array and response surface methodology (RSM) has been used to obtain the regression model for the specific cutting energy and material removal rate. Analysis of variance (ANOVA) was used to find out the significance of each cutting parameter. Finally, the developed models were interfaced with an artificial bee colony (ABC) to determine the optimal set of cutting parameters.

  • ENERGY HEAT EXCHANGE IN THE ZONE OF CONTACT OF THE PROBE OF AN ATOMIC FORCE MICROSCOPE WITH THE SURFACE UNDER STUDY

    • Andriienko О.
    • Ralchenko S.
    • Bondarenko M.
    • Bondarenko Yu.

    pg(s) 495-499

    • Abstract
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    The article studies the mechanisms of energy exchange and transformations, which occur in a measuring instrument (probe) of an atomic force microscope (AFM) in the process of studying solid surfaces of materials. Mathematical modeling of the heating process of individual elements of the measuring unit of the atomic force microscope at the preparatory, final stages and the scanning stage of the surface under study was carried out. At the same time, such energy components of the processes occurring in the AFM control unit were taken into account. By minimizing the factors (heat dissipation due to friction of the probe on the surface), which negatively affect both the results of the monitoring and the condition of the probe and the surface, stable operation modes of the AFM are established. The solution of the equivalent thermal scheme of an atomic force microscope is presented, which confirms the adequacy of the mathematical models obtained.

  • EXAMPLES OF SOFTWARE CONFIGURATION MANAGEMENT

    • Ivanova Milka

    pg(s) 500-503

    • Abstract
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    When you build software the changes happens. Because it happens you need to manage it effectively; this is a set of activities designed to manage shanges by identifying the work prodicts that are lakely to change, establishing relationships among them, defining the mechanism for managing work products, controling the changes imposed ang repochanges made. In the report is made the distinction between software support and software configuration managemet ang give the examples of using.

• MATERIALS

  • MICROSTRUCTURE AND MECHANICAL PROPERTIES OF A HYPEREUTECTIC ALLOY AlSi18, MODIFIED BY A NANODIAMOND AND PHOSPHORUS

    • Dochev B.
    • Velikov A.
    • Panov Iv.
    • Diakova V.
    • Kuzmanov P.
    • Manolov V.

    pg(s) 504-506

    • Abstract
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    A study of a hypereutectic aluminum-silicon alloy AlSi18, modified by a conventional modifier – phosphorus (P) and a nanosized powder of a nanodiamond (ND) has been carried out. Refinement by 40.8% of the primary Si crystals and by 51% of the Si crystals in the composition of the eutectic has been obtained for the phosphorus-modified alloy in result of the modification. The refinement of the above values for the alloy modified by ND is 41.5% and 94% respectively. The phosphorus-modified alloy AlSi18 has an increased tensile strength (Rm) by 18.5%, relative elongation (А5) by 14.3% and hardness by 1.5%. The alloy, modiified by ND has an increased by 20.4% tensile strength (Rm), increased relative elongation (А5) by 7.15% and hardness decreases by 6.2%.

  • AN ALLOY FOR ACCUMULATION OF HYDROGEN WITH STRUCTURE OF LAVES PHASE AND BCC SOLID SOLUTION FOR THE NEEDS OF ALTERNATIVE ENERGY

    • Dekhtyarenko V.
    • Pryadko T.
    • Bondarchuk V.
    • Mogylnyy G.
    • Khranovskaya E.

    pg(s) 507-510

    • Abstract
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    The microstructure and phase composition of Ti47,5Zr30,2Mn15,5V5Ho2 multiphase alloy and the phase composition of the hydrogenation product were investigated by scanning electron microscopy and X-ray phase analysis. It was established that holmium introduced into the alloy not only dissolves in the phase components of the eutectic, but also forms a new phase (oxide). The formation and further growth of crystals of holmium oxide occurs only on the surface of the crystallites of Laves phase. During the first hydrogenation the active absorption of hydrogen by the alloy occurred only when it was heated up to 520 °C, with hydrogen capacity of 2.62 wt.%. The hydrogenation product obtained after the saturation of the alloy with hydrogen contained a new phase, in addition to the hydrides based on the initial phases. After the sorption-desorption cycle, the alloy was already in the activated state and able to absorb hydrogen at room temperature and low pressure (0.21 MPa) starting from the first seconds of contact with the hydrogen medium.

  • ON THE EFFECT OF INTERMEDIATE PRESSING OF PREFORMS ON THE FORMATION OF A DEFECT-FREE STRUCTURE OF FINISHED PRODUCTS FROM CARBON FIBER-FILLED POLYTETRAFLUOROETHYLENE

    • Voropaev V.V.
    • Skaskevich A.A.
    • Lesun A.N.
    • Sarokin V.G.
    • Yankov E.

    pg(s) 511-514

    • Abstract
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    This article describes a method for producing composite materials based on polytetrafluoroethylene with high performance properties. One of the obstacles to achieve this result had been the accumulation of moisture in the semi-finished product, which subsequently led to the appearance of defects in products made of fluorine composites. It is proposed to produce semi-finished preforms under reduced specific pressure, in which the moisture content is easier, cheaper and more efficient to control than with the current technological regulations. It is shown that the use of these semi-finished preforms allows getting almost defect-free products with high performance characteristics.

  • QUALITY MANAGEMENT OF NEW CERAMIC MATERIALS BY USING STATISTICAL EXPERIMENTAL DATA PROCESSING PROGRAMS

    • Sadenova M.
    • Utegenova M.
    • Anuarbekov T.

    pg(s) 515-518

    • Abstract
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    In this paper, we consider the theoretical foundations of the synthesis of ceramic materials from natural aluminosilicates with the addition of technogenic materials (lead and copper slag) using powder metallurgy methods. The characteristics of the feedstock, properties are presented, the geographical deposits of natural components are shown. The possibility of obtaining pelletized, granular, and block ceramic materials based on natural and technogenic sorbents of Kazakhstan is shown by powder metallurgy methods.