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Wyszukujesz frazę "Ružbarsky, Juraj" wg kryterium: Autor

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    Wyświetlanie 1-12 z 12
    Tytuł:
    Properties of alloys in the crystallization interval
    Autorzy:
    Ružbarský, Juraj
    Powiązania:
    https://bibliotekanauki.pl/articles/2064802.pdf
    Data publikacji:
    2019
    Wydawca:
    STE GROUP
    Tematy:
    viscosity
    initial stress
    alloys for pressure die casting
    undercooling
    device for die temperature regulation
    Opis:
    In the contribution the high growth of viscosity and initial stress of alloys in the crystallization interval with undercooling against of the liquidus follows from theoretical analysis. At these alloys used in pressure die casting the permissible undercooling that does not endanger pressure die casting operation. The application of the device for die temperature regulation ensures the safe operation.
    Źródło:
    Multidisciplinary Aspects of Production Engineering; 2019, 2, 1; 375--381
    2545-2827
    Pojawia się w:
    Multidisciplinary Aspects of Production Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Possibilities of pressure die casting of iron alloys
    Autorzy:
    Ružbarský, Juraj
    Sitko, Jacek
    Powiązania:
    https://bibliotekanauki.pl/articles/409846.pdf
    Data publikacji:
    2019
    Wydawca:
    STE GROUP
    Tematy:
    pressure dies casting
    specific pressure on metal
    iron alloys
    steel
    Opis:
    The current trends of production of casts are directed towards production of components disposing of higher accuracy, increased quality of surface and homogenous structure. In case of a thin-walled cast the development of speed of pressing and of pressure was observed inside the mould cavity during pressure die casting of ferrous alloys. In case of die casting of ferrous alloys the attention was paid to life service of a pressing piston and of a filling chamber. The optimal temperature of the steel casting ranges from 1600 to 1750°C and optimal mould temperature ranged from 220 to 260°C. The residues having occurred in gates reached the hardness of 38 HRC and in case of casts the value was of 45 HRC. Influence of acting of resistance pressure on the thinwalled casts only minimally. With the increasing resistance pressure the structure becomes more fine-grained and along with the increasing thickness of the wall the influence of the resistance pressure increases as well. Technology of pressure die casting of iron alloys can be compared with the pressure die casting technology of aluminium alloys. As standard, for pressure die casting the cast irons with carbon content of lower than 3% are recommended.
    Źródło:
    Management Systems in Production Engineering; 2019, 4 (27); 199-204
    2299-0461
    Pojawia się w:
    Management Systems in Production Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Options for solutions of the inlet system into the mold
    Autorzy:
    Ružbarský, Juraj
    Krenický, Tibor
    Maščeník, Jozef
    Coranič, Tomáš
    Powiązania:
    https://bibliotekanauki.pl/articles/27323743.pdf
    Data publikacji:
    2023
    Wydawca:
    STE GROUP
    Tematy:
    pressure casting
    mold construction
    inlet system
    pressure
    odlewanie ciśnieniowe
    konstrukcja formy
    układ wlotowy
    ciśnienie
    Opis:
    The presented contribution points out the possibilities of solving the inlet system, as one of the important factors influencing the final quality of the castings. Due to its design and function, the sprue system influences the process of filling the mold cavity. With the correct design of the sprue system, we achieve the continuity of filling the mold cavity and the elimination of qualitative and quantitative errors caused by non-observance of basic principles in the design of sprue systems. When conducting the experiments, we monitored the mold inlet system, modeling the process of filling the mold cavity and the speed of the liquid metal in the notch and the mold cavity. The results of the experiments show that the speed of the liquid metal when filling the mold is approximately half of the calculated theoretical value.
    Źródło:
    Systemy Wspomagania w Inżynierii Produkcji; 2023, 12, 2; 57--70
    2391-9361
    Pojawia się w:
    Systemy Wspomagania w Inżynierii Produkcji
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Operating characteristics of bearings with magnetic nanoparticles doped lubricant
    Autorzy:
    Krenicky, Tibor
    Mascenik, Jozef
    Coranic, Tomas
    Ruzbarsky, Juraj
    Powiązania:
    https://bibliotekanauki.pl/articles/27324376.pdf
    Data publikacji:
    2023
    Wydawca:
    Instytut Techniki Górniczej KOMAG
    Tematy:
    lubricant
    magnetic nanoparticles
    bearing
    vibration
    lubrykant
    wibracje
    nanocząstki
    Opis:
    The main aim of the presented research was to investigate theoperational characteristics of a bearing when alternative lubricants were used for comparison with a standard lubricant, including that containing magnetic nanoparticles. The bearing was subjected to varying operating conditions, differing in terms of mechanical load status. The monitoring of the bearing operation parameters primarily focused on monitoring the velocity and acceleration of vibrations, as well as the operating temperature of the bearing. Thebearingwith lubricant doped by magnetic nanoparticles exhibited reduced vibration velocity and acceleration values both under no load conditions and when subjected to a mechanicalload. The operating temperature slightly increased during testing in the case ofthe bearing with nanoparticles compared to the bearing using the original lubricant.
    Źródło:
    Mining Machines; 2023, 41, 3; 168--174
    2719-3306
    Pojawia się w:
    Mining Machines
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Technical diagnostics of industrial double twist twinner machine for data cables
    Autorzy:
    Krenický, Tibor
    Ružbarský, Juraj
    Coranič, Tomáš
    Maščeník, Jozef
    Powiązania:
    https://bibliotekanauki.pl/articles/2175488.pdf
    Data publikacji:
    2022
    Wydawca:
    STE GROUP
    Tematy:
    vibrodiagnostics
    maintenance
    twisted pair cables
    return loss
    cable fault
    wibrodiagnostyka
    konserwacja
    kable typu skrętka
    usterka kabla
    Opis:
    The presented article focuses on the diagnostic measurement and evaluation of vibrations of equipment used for data-cable twisted pairing manufacture. A short description of the process of the data cables manufacturing process to which the diagnosed device belongs is provided and the qualitative parameters of the data cables are mentioned. The experimental part is devoted to the experimental diagnostics of the given system in order to locate and identify the possible reason for the occurrence of the parameter´s critical value of the loss of the data cable. When deterioration of electric properties was detected, monitoring the basic oscillation characteristics has been deployed as the key tool to detecting damaged machine parts, and avoiding quality deterioration of the products in the manufacturing process. Finally, the quality of the paired cables after the repair has been confirmed by measurements verifying the efficiency of the measures performed.
    Źródło:
    Systemy Wspomagania w Inżynierii Produkcji; 2022, 11, 2; 35--46
    2391-9361
    Pojawia się w:
    Systemy Wspomagania w Inżynierii Produkcji
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Measurement of dynamic characteristics of screw conveyor
    Autorzy:
    Coranič, Tomáš
    Maščeník, Jozef
    Ružbarský, Juraj
    Krenický, Tibor
    Powiązania:
    https://bibliotekanauki.pl/articles/2175491.pdf
    Data publikacji:
    2022
    Wydawca:
    STE GROUP
    Tematy:
    software
    modal analysis
    screw conveyor
    vibration
    oprogramowanie
    analiza modalna
    przenośnik ślimakowy
    wibracje
    Opis:
    A machine has always been, is and will be the technical progress. The basis of every economy is the progressiveness of manufacturing engineering since it manufactures components for all industries. Technical requirements in manufacturing engineering are constantly leading to an increase of the technical level of manufacturing equipment. Profound knowledge of scientific fields precedes a successful fulfilment of the technical requirements. Structural units of manufacturing machines are complex mechanisms that must work reliably and safely with an emphasis on their important function. These units create new objectives for their research and optimization.
    Źródło:
    Systemy Wspomagania w Inżynierii Produkcji; 2022, 11, 2; 66--76
    2391-9361
    Pojawia się w:
    Systemy Wspomagania w Inżynierii Produkcji
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    New concept of software for calculation of chain gears
    Autorzy:
    Maščeník, Jozef
    Coranič, Tomáš
    Krenický, Tibor
    Ružbarský, Juraj
    Powiązania:
    https://bibliotekanauki.pl/articles/2175493.pdf
    Data publikacji:
    2022
    Wydawca:
    STE GROUP
    Tematy:
    software
    design
    chain gear
    calculation
    strength
    oprogramowanie
    projektowanie
    przekładnia łańcuchowa
    obliczanie
    wytrzymałość
    Opis:
    At present, practically all areas of design activities are supported by computer technology, which can be effectively used in the design of gears, belts and chain transmissions, especially in the field of calculations, as well as graphics solutions. However, their use requires mastering the basic principles of computational procedures contained in the programs in question and, on that basis, critically evaluating computer-generated solutions. The presented paper deals with the design proposal and application of program for calculation and check of chain gears. Although there are currently various programs on the market that can design chain transmissions and perform strength analysis, there is still space for improvement and the creation of these programs. The computing program has been created as a spreadsheet in the working environment of the Microsoft Office program by the Excel application through defined sequences of the individual commands. The program serves for design proposal of a chain drive by means of inserted databases, graphs and tables. In the process of designing and checking the input values are entered such as performance, rotations, and number of wheels. Through calculation the software generates speed of a chain, circumferential speed, tensile force, number of chain links, axial distance, etc. At the same time the paper compares generated parameters with manual calculation of the chain gear.
    Źródło:
    Systemy Wspomagania w Inżynierii Produkcji; 2022, 11, 2; 47--56
    2391-9361
    Pojawia się w:
    Systemy Wspomagania w Inżynierii Produkcji
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Casting machines and properties of Al-Si castings alloys
    Autorzy:
    Ružbarský, Juraj
    Krenický, Tibor
    Maščeník, Jozef
    Coranič, Tomáš
    Powiązania:
    https://bibliotekanauki.pl/articles/2175487.pdf
    Data publikacji:
    2022
    Wydawca:
    STE GROUP
    Tematy:
    die casting
    technological parameters
    machines
    die casting pressure
    pressing speed
    odlewanie ciśnieniowe
    parametry technologiczne
    maszyny
    Opis:
    The paper focuses on the research of holding pressure inside the mould cavity and pressing speed as technological parameters of die casting. The experiments conducted within the frame of the practical part examined the plunger and the pressure or the holding pressure in the mould cavity influencing the mechanical properties of a casting which were represented by ultimate tensile strength and percentage share of porosity of Al-Si castings. The results of experiments and analysis of the measured values proved the relation between pressure, or holding pressure, in the mould cavity and the ultimate tensile strength and porosity of castings. Plunger pressing speed is closely related to mould cavity filling mode which affected the final porosity of casting. It can be assumed that die casting is positively influenced by the increase of ultimate tensile strength and reduction of porosity during the increase of pressure or of holding pressure in the mould cavity. Higher values of holding pressure caused the elimination of pores which resulted in a decrease in the percentage share of pores in the casting and an increase in values of ultimate tensile strength.
    Źródło:
    Systemy Wspomagania w Inżynierii Produkcji; 2022, 11, 2; 8--34
    2391-9361
    Pojawia się w:
    Systemy Wspomagania w Inżynierii Produkcji
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design of self-leveling table for FFF additive technology
    Autorzy:
    Coranič, Tomáš
    Ružbarský, Juraj
    Krenický, Tibor
    Maščeník, Jozef
    Powiązania:
    https://bibliotekanauki.pl/articles/27323744.pdf
    Data publikacji:
    2023
    Wydawca:
    STE GROUP
    Tematy:
    additive technologies
    calibration
    Arduino
    structural design
    technologie addytywne
    kalibrowanie
    projekt konstrukcyjny
    Opis:
    The presented paper describes the conceptual design of a worktable intended mainly for use in combination with FFF additive technologies, calibrated using a gyroscope and accelerometer. The proposed system is based on a programmable Arduino platform that operates with three digital servomotors and a mechanical gyroscope. In the introduction, the theoretical assumptions, and definitions of basic concepts such as a gyroscope, electric motor, and RC servomotor are described. Subsequently, the contribution is devoted to the selection of suitable components, the schematic connection, and the design itself in the Autodesk Inventor program. In the conclusion, the anticipated benefits of using the technical solution when applied in FFF additive technologies are described.
    Źródło:
    Systemy Wspomagania w Inżynierii Produkcji; 2023, 12, 2; 109--117
    2391-9361
    Pojawia się w:
    Systemy Wspomagania w Inżynierii Produkcji
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Monitoring of belt floating under controlled belt transmission load
    Autorzy:
    Mascenik, Jozef
    Coranic, Tomas
    Ruzbarsky, Juraj
    Krenicky, Tibor
    Powiązania:
    https://bibliotekanauki.pl/articles/27324381.pdf
    Data publikacji:
    2023
    Wydawca:
    Instytut Techniki Górniczej KOMAG
    Tematy:
    monitoring
    belt floating
    strength
    belt gear
    tension
    load
    przekładnia pasowa
    napięcie
    Opis:
    The paper focuses on experimental monitoring of tightening and floating of the belt at controlled loading of belt gear. In general, the belt gear is referred to as friction gear in practice the primary function of which is to transfer the performance as a consequence of frictional forces occurring between a driven belt pulley, a driving belt pulley and a flexible element. In experimental measurements, the flexible element is represented by a V-belt. The main advantages of the belt gears are peripheral speed, flexible engagement, silent running, vibration absorption and their price. Standard operation of the belt gear requires correct belt tightening which is achieved by movement of a pulley and a tension roll. At the same time, the belt tightening can be achieved by changing the spacing of the shaft axes used in experiments. In the case of belt gears use, specific principles must be observed. The principles include tightening of the belt with particular force which represents, in fact, primary condition of transmission of motion and force. At rest, the tension of both belt parts is identical. Complex analysis of belt gears was followed by experimental measurements on the stands designed for testing and monitoring of belt gears. For the purposes of monitoring of the belt floating there was a system designed which used a high precision sensor to measure distance between the belt and the sensor. At the same time, a device designed to determine the belt tightening was used as well. All measurements were analysed and collected data and facts were used to determine dependencies possible to be applied when the monitored parameters are evaluated. The results of experimental monitoring of the selected parameters at controlled loading of the belt gear can be useful in practice for designing, checking and maintenance operations.
    Źródło:
    Mining Machines; 2023, 41, 2; 107--118
    2719-3306
    Pojawia się w:
    Mining Machines
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of Physical and Mechanical Properties of Steel During Grinding and Sharpening
    Autorzy:
    Biały, Witold
    Ivanova, Tatiana Nikolaevna
    Žarnovský, Jozef
    Ružbarský, Juraj
    Powiązania:
    https://bibliotekanauki.pl/articles/2064901.pdf
    Data publikacji:
    2020
    Wydawca:
    STE GROUP
    Tematy:
    steel 8KHF
    sharpening
    edge
    thermal deformation
    structural transformations
    thermal process
    Opis:
    A direct influence on the physical and mechanical state of the surface layer of wedge-shaped plates made of 8KHF steel is exerted by heat generation processes developing in the zone of a high-speed thermal process. Research on the influence of the parameters of a high-speed thermal process on the change in the structure of 8KHF steel (GOST 5950-2000 Russia, standard PN/H 85023 brand NCV1 Poland) was fulfilled. It allowed studying the nature of the change in the microstructure depending on short-term heating to various temperatures and rapid cooling. As a result, critical points of the beginning and the end of structural transformations during heating were determined. Research on thermal processes in a high-speed thermal process made it possible to establish regularities of influence of cutting speed, source speed, contact area, coolant properties and heat transfer coefficient on the temperature and rate of thermal processes in surface layers, as well as their impact on the depth of heating to a certain temperature. The study also allowed us to show the relationship between temperature and rates of heating and cooling. The solution to this problem, taking into account the action of the cooling fluid, gives the opportunity to bring the picture of the development of thermal processes closer to real conditions and makes it possible to reasonably predict the structural state of the surface layer of wedge-shaped parts made of 8KHF steel under various conditions of a high-speed thermal process.
    Źródło:
    Multidisciplinary Aspects of Production Engineering; 2020, 3, 1; 128--140
    2545-2827
    Pojawia się w:
    Multidisciplinary Aspects of Production Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence and optimization of the setting of input parameters of laser profilometry by the surface measurement manufactured by the AWJ technology
    Autorzy:
    Mitaľ, Gerhard
    Gajdoš, Ivan
    Ružbarsky, Juraj
    Jachowicz, Tomasz
    Majewski, Łukasz
    Powiązania:
    https://bibliotekanauki.pl/articles/102196.pdf
    Data publikacji:
    2018
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    AWJ
    laser
    measurement
    roughness
    profilometry
    contactless
    contact
    method
    pomiary
    chropowatość
    profilometria
    kontakt
    metoda
    Opis:
    The publication deals with the measurement and evaluation of roughness parameters by means of laser profiling, and its main task is to determine the effect of selecting the internal gain adjustment (Gain mode) on measured roughness values of the surface treated by the water beam technology. The publication details the software, hardware, and other parts of the device designed to measure the roughness of different types of surfaces. It further describes the behavior of individual parts of the apparatus as a whole and methods of measuring the roughness of the surface along a defined profile section by means of the triangulation principle of laser profiling. The measured sample was cut by a thick (rough) cut at pressure of 380 MPa. As an abrasive, the Australian Grenade with the grain Mesh 50 was used.The experiment was carried out at the Faculty of Production Technologies in the Laboratory of Roughness Measurement at the Department of technical systems design and monitoring in Prešov. Measurement of surface roughness parameters was performed on an optical measuring system to control surface parameters and the contact roughness meter Mitutyo SJ400.
    Źródło:
    Advances in Science and Technology. Research Journal; 2018, 12, 1; 329-337
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-12 z 12

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