Univerzitná knižnica - Vedecké odborné časopisy
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Item Analýza súčasného stavu problematiky využitia manipulačných zariadení pre potreby skúšobných stavov brzdných komponentov koľajových vozidiel(University of Žilina, 2024) Molnár, Denis; Blatnický, Miroslav; Dižo, Ján; Lovska, AlyonaThe paper deals with the current state of the art of the research test stands of braking components of rail vehicles in synthesis to the need of handling equipment utilisation accompanying the research in question. The compact form of the introduced information will be the input material for the design of an original handling device, sophisticatedly designed for the needs of the test stand for rail vehicles brake components testing. The brake test stand is located at the Department of Transport and Handling Machines at the Faculty of Mechanical Engineering of the University of Žilina. The task of proposed handling device will be to facilitate the work of laboratory staff, increase the safety of handling and shorten the preparation time of the measurement process at brake test stand. In addition, a more detailed description of the brake test stand at the Department of Transport and Handling Machines is included in the paper.Item Odvodenie matematického modelu hnacieho mechanizmu pre pohon prídavných zariadení dopravného prostriedku(University of Žilina, 2023) Dižo, Ján; Ishchuk, Vadym; Lovska, Alyona; Blatnický, Miroslav; Molnár, DenisThe article is focused on a derivation of a mathematical model of a drive mechanism of for a drive of an additional devices of a transport mean. Additional devices are inseparable part of lorries, buses as well as railway vehicles, such as locomotives with independent traction. These additional devices serve for drive of compressors or other similar devices. The mathematical model is derived by means of the Lagrange’s quations of the second kind method. After finding the energies, the method of the reduction of mass and force quantities to the chosen part. In this case, it is reduced to the drive shaft of the considered mechanism. The presented mechanism is described by means of one equation of motion. This equation can be solved by means of the Matlab software. The last part of the article additional includes illustrations of the solved mechanism created in the Simpack multibody software, which can be analysed and the results can be compared with the results obtained from the Matlab software.Item Matematický model pohonnej sústavy koľajového vozidla(University of Žilina, 2023) Dižo, Ján; Blatnický, Miroslav; Ishchuk, Vadym; Molnár, Denis; Solčanský, SebastiánThe presented research is aimed at the derivation of a mathematical model of diesel-mechanical drivetrain of a rail vehicle. It is derived by means of the Lagrange’s equations of the second kind. The derived mathematical model allows to understand the essential principle of the derivation of the mathematical model of the diesel-mechanical drivetrain of a rail vehicle, an application of the numerical mathematical methods for the solving the equations of motion and for evaluation of the wanted outputs quantities, such as waveforms of revolutions and torques of shafts and others.Item Konštrukčný návrh rámu korby pre jednonápravový príves za traktor(University of Žilina, 2023) Dižo, Ján; Blatnický, Miroslav; Ishchuk, Vadym; Molnár, Denis; Kurtulík, JakubThis article is focused on the results of the research, which is intended to design of a single-axle tipping tractor trailer. The trailer consists of two main parts, a frame and a superstructure. Both parts of the trailer must undergo strength analyses under determined loading conditions. While results of strength analyses of the frame were already presented on the previous event, this work shows an overview of the strength analysis of the tipping superstructure of the trailer. The structure has been analysed under static loads and dynamical effects have been considered by means of a dynamic coefficient. The task has been performed by application of the Finite Element Method (FEM). Some chosen load cases have been analysed and the distribution of stresses in the structure has been evaluated. Results have shown that the designed structure of the tipping superstructure is able to withstand the given loads and it can be used in practice.Item Návrh elektrického mechanizmu otáčania výložníka stĺpového žeriava pre manipuláciu s kalovými čerpadlami(Žilinská univerzita v Žiline, 2023) Blatnický, Miroslav; Dižo, Ján; Molnár, Denis; Ishchuk, VadymThe article is a continuation of the issue of the technical solution of the hinge for handling sludge pumps in the Jaslovské Bohunice nuclear power plant. The main goal is the design of the electric jib rotating mechanism. It was based on the previous proposal for placing the boom consisting of a dimensional calculation of the new support column and the proposal for placing the boom on this column. The save consisted of two bonds. The upper support of the boom was solved using a rolling bearing fixed in the upper part of the column. The bottom bearing contains an axial plain bearing and a fixed gear as part of the rotating mechanism. In the next step, it is necessary to design the attachment of the selected electric motor with a planetary gearbox and a pinion for this construction. The priority in the design will be mainly to observe the axial distance of the gears, but also to consider the mounting method given by the manufacturer and the torque generated by the engine. A holder in which the motor is attached and then attached to the structure will be designed. Thanks to this, the axial distance will be fulfilled. In addition to supporting the motor, the holder also serves as a radial bearing lock, preventing the bearing from being accidentally pulled out. The result of calculations and designs will be 2D diagrams and 3D visualization of the new construction.Item Konštrukčný návrh mechanizmu skrutkového manipulátora turniketu sypkých materiálov(Žilinská univerzita v Žiline, 2023) Molnár, Denis; Blatnický, Miroslav; Dižo, Ján; Ishchuk, VadymThe article is the next step in the ongoing research regarding the incorporation of the proposed bulk material turnstile assembly into an existing production line serving the food industry for bagging powdered milk. The main goal of this contribution is the presentation of the structural design and related technical calculations of the screw manipulator as part of the turnstile for loose materials. The proposed mechanism will enable precise manipulation of the turnstile, especially when it is necessary to clean the pipe connected to the turnstile. Such handling is relevant nowadays due to increasing the safety of maintenance of machines and equipment and due to reducing the physical load of maintenance workers. The results prove the appropriateness of the use of the given structural design and are the basis for further research in the given area. The results will be implemented in the form of boundary conditions for the numerical analyses of the connecting elements of the frame carrying the entire carriage with the turnstile (the frame forms a path for the carriage) and also for numerical calculations of the frame itself. The goal is to achieve a state where the entire structure is safe for the operator during maintenance and also for its surroundings during normal operation.Item Technológ 3/2022(Žilinská univerzita v Žiline, 2022) Sýkorová, Martina; Bolibruchová, Dana; Bílik, Jozef; Sobota, Róbert; Šuba, Roland; Mojžiš, Milan; Litvaj, Ivan; Dižo, Ján; Blatnický, Miroslav; Ishchuk, Vadym; Molnár, Denis; Štaffenová, Katarína; Rakyta, Miroslav; Bubeník, Peter; Biňasová, Vladimíra; Kasajová, Marta; Tarbajovský, Pavol; Puškár, Michal; Абович Подригало, Михаил; Петрович Кравченко, Александр; Герлици, Юрай; Сергеевич Шеин, Виталий; Сергеевич Ткаченко, Александр; Александровна Кравченко, Екатерина; Kantoríková, Elena; Koňár, Radoslav; Matejka, Marek; Podprocká, Radka; Kostrzewski, Mariusz; Jerzy Nowak, Wojciech; Medňanský, Martin; Brůna, MarekVplyv teploty precipitačného vytvrdzovania na vlastnosti zliatiny AlSi5Cu2Mg legovanej Zr || Seamless Tubes Manufacturing Processes Analysis || Decision-making process and knowledge management, knowledge management and skills || Nákladné prívesy za traktor - koncepčné usporiadanie a ich typy || Proces reverzného inžinierstva s využitím 3D laserového skenovania || Nákladné prívesy za traktor - špeciálne verzie a zvláštna výbava || Knowledge, knowledge management and innovations || Návrh modelu parného rušňa || Integrovaný systém pre redukciu emisií spaľovacích motorov || Technical preparation of production || О выборе мощности двигателя автомобиля на этапе проектирования || Vplyv tepelného spracovania na nástrojové ocele || Skúsenosti pri ultrazvukovom skúšaní zvarov v praxi || Hodnotenie tepelného zaťaženia vysokotlakovej formy pomocou numerickej simulácie || Rzeczy kilka o transporcie kolejowym ładunków w Japonii || Precipitačné vytvrdzovanie Al-Si-Cu-Mg zliatin || Numerické simulácie vplyvu technologických faktorov na štruktúru vysokotlakových odliatkovItem Technológ 2/2022(Žilinská univerzita v Žiline, 2022) Mičietová, Anna; Minárik, Peter; Čilliková, Mária; Neslušan, Miroslav; Čapek, Jiří; Sivák, Samuel; Maláková, Silvia; Harachová, Daniela; Kulya, Juliy Martyn; Tomáš, Miroslav; Evin, Emil; Kantoríková, Elena; Moravec, Ján; Galčík, Marek; Brůna, Marek; Širanec, Lukáš; Bolibruchová, Dana; Bronček, Jozef; Drbúl, Mário; Konstantová, Viera; Kožienka, Lukáš; Koňár, Radoslav; Šutka, Jozef; Blatnický, Miroslav; Dižo, Ján; Molnár, Denis; Bubeník, Peter; Kolesnyk, Olha; Rakyta, Miroslav; Čapek, Juraj; Frátrik, Martin; Mičian, Miloš; Trško, Libor; Hirjak, Rastislav; Mišaneková, Viera; Chudíková, Dáša; Šimko, Radomír; Piroško, Martin; Jaremko, Matúš; Uhrík, Radoslav; Melo, Borislav; Málek, Miroslav; Mičian, Miloš; Derďák, Ján; Sikora, Eduard; Baba, Marcel; Kotora, Miroslav; Kamenský, Rastislav; Pobočíková, Ivana; Guldan, Vladimír; Sedliačková, Zuzana; Chupáč, Radoslav; Кравченко, Александр Петрович; Кравченко, Екатерина Александровна; Дижо, Ян Янович; Блатницкий, Мирослав ЯновичAbstract: This paper deals with surface integrity after shot peening of AlSi 304 under variable conditions expressed in term of shot-peening cycles and corresponding Almen intensities. Surface state is investigated from the point of view of surface topography, surface roughness and microhardness. Also phase transformation of paramagnetic austenite into strain induced martensite is investigated as well by the use of Barkhausen noise technique. It was found that the fraction of strain induced martensite grows with the number of shot-peening cycles and its extent penetrates deeper beneath the free surface. Furthermore, surface roughness decreases along with increasing number of cycles. Surface microcracking occurs after prolonged shot-peening cycles. Abstract: Paper was devoted to new methods coming to wide use in design engineering. These methods contained of topology optimization and generative design. Although topology optimization is practiced for some time, the generative design is its biggest contender. Both methods were described in a way of how they work and what methodology needs to be abided. At the end, a comparison between advantages and disadvantages as well was done, taking into account use of both of them in gear wheel body optimization. Abstract: The paper focuses on the manufacturability optimization of the of case made of aluminium by the rubber forming process. Al6016 aluminium was considered as the material for the cover and its constitutive equations were defined by Hill 48 and Hollomon models. The Mooney-Rivlin hyperelastic material model described the material properties of the rubber-made punch. Simulation model was built in Pam stamp software and the results were evaluated as well. The results were optimized in terms of thickness thinning and punch stroke, for two different rubber hardness. Abstract: The article describes the method of boriding sintered carbides type H1 (K10) and G1 (K20) and tool steel Cr-Mo-V. The aim of this work is to analyze the knowledge about boriding of steels with the focus on the technological assumptions of the use of boriding in the production process of forming tools in order to increase the resistance to friction, abrasive and adhesive wear. Interestingly, boriding is still an unconventional method of surface treatment. The presented work deals with the structural analysis of borided layers. Steel samples of 1.2365 material and sintered carbides H1 (K10), G1 (K20) borided with EKabor 2 powder were monitored. For the testing of metallographic samples, the methodology developed for the study of the microstructure of sintered carbides was developed. The monitored samples, borided at 900 °C for 240 min, obtained a uniform layer 5 μm thick. An increase in microhardness of more than 700 HVM was measured for carbide H1 (K10) and almost 1500 HVM for G1 (K20). The increase in hardness is due to the formation of dispersed cobalt borides Co2B and CoB. Abstract: Submitted paper aims to further analyse the possibilities of melt velocity reduction in the gating system. In this work was designed the naturally pressurized gating system. Proposed design appears to be a suitable solution for reoxidation processes reduction. Disadvantage of this system is that the melt velocity is supercritical, which leads to splashes of the melt when entering gates. Main focus of experimental part is to find a proper way to reduce the melt velocity, which will consequently decrease the reoxidation processes. For the purpose of the melt velocity reduction, labyrinth filters, flat filters and foam filters effect were investigated and visualized by simulation software ProCAST. Experimental casts were carried out, to be able to verify the results of the simulations. Mechanical properties and porosity evaluation was investigated on casted samples. Flat and foam filter appeared to be a suitable to melt velocity reduction and it was associated with increasing mechanical properties of castings. Construction with foam filter achieved the best results. Abstract: The aim of this paper was to analyze the impact of different zirconium addition (0.05; 0.10; 0.15 and 0.20 wt. % Zr) on selected properties of AlSi5Cu2Mg aluminum alloy. It is a new alloy for cylinder head castings and has only been used for a relatively short time. The specificity of this alloy is its chemical composition - specifically the low permitted Ti content, which makes it impossible to refine the grain structure of this alloy using standard Al-Ti-B grain refiners. The results of our research showed that increasing zirconium content had no effect on the increase in ultimate tensile strength, yield strength and hardness of as-cast samples. After T7 heat treatment, a more significant increase in UTS, YS and thermal conductivity occurred due to the precipitation of Cu- and Mg rich strengthening precipitates. Zirconium-rich intermetallic phases were observed in the shape of separate thick needles or as a cluster of two crossed thinner needles. These phases were not affected even after heat treatment, indicating their high thermal stability. Increasing the Zr content was accompanied by an increase in liquidus temperature and area fraction of porosity values. Abstract: International Standard EN ISO 22081 sets out rules for the definition and interpretation of general geometric specifications and general dimensional specifications according to Article 5.12 of ISO 8015: 2011). The general GPS specifications apply individually to each characteristic of a geometric element or to a relationship between geometric elements for which no individual GPS specification of the same type is defined. The general GPS specifications, which prescribe general dimensional and geometric tolerances, make it possible to simplify the indications and thus the reading of the drawing documentation, while at the same time facilitating the selection of tolerances. The new standard EN ISO 22081 replaces the standard ISO 2768 and gives rules for the application of the general geometric and general dimensional specification. Abstract: The paper deals with the limitations of testing ferromagnetic materials by the magnetic particle method. It focuses mainly on the influence of orientation and depth of materiál defects on the reliability of identification of surface and volume defects when using color and UV methods. The results obtained using unidirectional and alternating pole magnetization in manual control with a magnetic yoke are compared. Abstract: The article deals with the historical development and analysis of the current state of handling machines used in the entertainment industry. It points in particular to the material aspect, i.e. materials used for the production of amusement park equipment components. The article represents an important aspect that precedes the design of such a device, respecting the currently valid legislative requirements based on the standard STN EN 13814 so as to ensure protection against injuries or potentially dangerous situations (ejection, falling out, hitting, etc.). Abstract: The growing trend of using and processing big data brings space to study, analyze and understand the performance aspects of the monitored advanced technologies. In general, benchmarking is a well-known tool in the world of software systems that is commonly used to identify companies' strengths and weaknesses. The article presents the use of the benchmarking tool as a tool for evaluating the application of advanced technologies supporting the management of the production process. Abstract: The strength of fine-grained HSLA steels is mainly based on the grain boundary strengthening, which as the only strengthening mechanism allows the yield strength to increase without a decrease in ductility. Therefore, any change in grain size leads to irreversible changes in the properties of the material. Such changes also occur in the coarse-grain heat affected zone (CGHAZ) of welded joints, where there is an increase in austenitic grain size, which leads to a decrease in yield strength, or decrease of fatigue strength. The paper experimentally determines the growth kinetics of austenitic grain for S960MC steel. Based on the measured data, it will be possible to predict the grain growth kinetics in the CGHAZ and FGHAZ. The acquired knowledge will help to set the welding processes of fine-grained steels. The measured data will also provide a basis for numerical simulations of metallurgical processes in high-temperature HAZ during welding. Abstract: One of the basic requirements of the current industrial production is to extend the life time of thermal aggregates while taking into consideration the maximum economic effectiveness. The use of non-shaped refractory mixtures for manufacturing of monolithic linings represents a progressive trend that replaces traditional brick linings. Non-shaped materials enable to create linings of different shapes and sizes, their firing takes place at the consumer and their repair is much simpler. These aspects increase the productivity and save energy. The paper covers practical applications of castables from the production of the company RMS Košice s.r.o. in the foundry industry. Abstract: The article is a continuation of research dealing with the construction of entertainment facilities. The main goal of the authors is therefore to design such an entertainment device according to their own design. This goal was preceded by a historical overview of the development of transport and handling technology used in the entertainment industry. The current work aims to analyse the main components used in the construction of these devices such as nacelles, seats, restraints or drives and fasteners according to STN EN 13814 so that the design meets all requirements. Abstract: The paper is supplemented by a discussion of the results and in the end an evaluation of the experiments is made. The paper presents basic theoretical knowledge about the cutting process. The experimental part describes the cutting, forming and evaluation of the obtained cylindrical samples for rolling elements. Abstract: Residual stress plays an important role in welded structures, which are stressed not only by cyclic loading. The work deals with the creation of a butt weld joint made of HSLA steel S960MC with a thickness of 3 mm and its subsequent analysis for residual stresses. The result of the work is the evaluation of the residual stresses of the welded joint. Abstract: In addition to the mechanical properties, the formability and appearance after painting of the coated sheets depends on the surface texture. The surface roughness characteristics of the sheet, the mean arithmetic deviation Ra and the number of peaks per centimetre Pc, depend on the surface texture of the finishing rolls of the rolling mill, their wear and the removal on the rolling mill. This paper presents the results of an investigation of surface-finished sheet metal, the surface of which was textured by changing the electrodischarge texturing (EDT) parameters of the finishing rolls of a rolling mill. The optimization of current Ip, voltage Up, pulse duration POnT and pulse off time POffT on the target values of roughness RaT,FR and number of peaks PcT,FR of finishing rolls was carried out by response surface methodology (RSM). The obtained regression models describe with a high degree of accuracy the relationships between the input electrodischarge texturing parameters of the finishing rolls and the output texture characteristics RaT,FR and PcT,F Abstract: The issue of the conditions and suitability of the supply of glass to the dispenser head can be precisely solved only with the use of knowledge of fluid mechanics. The paper presents the used calculation methods of finite parameters and also makes their mutual comparison in terms of suitability of the solution. Abstract: In the hot metal and steel production the thermal equipment used for their production is essential with respect to the associated costs. The lining of torpedoes, blast oxygen furnaces, hot metal and steel ladles must withstand challenging manufacturing conditions. The working lining, that gets in contact with hot metal, wears out since it is affected by molten metal. The permanent lining on the other hand fulfills the safety and insulation function. The permanent lining is supposed to collect molten metal if the working lining is worn out and keep the metal temperature on the level of processing. When emptying a ladle, the lining protective layer (scab) is created if the temperature on the working lining surface is lower than the metal melting temperature. When designing the lining composition, the emphasis is given to material properties, as well as to its life time at the lowest costs per ton of steel. The paper evaluates permanent linings of metallurgical aggregates based on their thermal shock resistance and level of penetration into the brick volume. Abstract: The paper deals with an overview of selected additive technologies used in the automotive industry. The emphasis is mainly on technologies that use metal powders. Furthermore, the work focuses on machine improvements and also presents a possible breakthrough in series additive production thanks to new production systems. Abstract: The paper presents the application of one-way analysis of variance (ANOVA) and Tukey's HSD method of multiple comparison, which can be used in the experiment, which determined the effect of cutting speed on the perpendicularity deviation of the cutting surface when cutting stainless steel X5 Cr Ni 1810 using laser. The details and technological parameters of laser cutting steel are mentioned. Based on the results obtained using ANOVA and Tukey's HSD method, it can be argued that different cutting speeds have a statistically significant effect on the perpendicularity deviation of the cutting surface. Abstract: The solution of electromagnetic compatibility and resistance of equipment to atmospheric discharges is a very important issue in the development and testing of electrotechnical and electronic equipment. The paper presents a numerical calculation of the parameters of a simplified mathematical model of a trial current and voltage pulse, which is defined by the IEC 61000-4-5 standard. The simplification consists in replacing the current pulse leading time, which is determined by said standard as 1.25 times the time from reaching 10% of the maximum amplitude to reaching 90% of the maximum amplitude, by a time from 0% to 100% of the maximum amplitude. For the solution of the equations for the calculation of the parameters of the simplified model by the numerical Newton - Raphson method, the initial approximation of the solution is determined and the cases when the solution does not exist are determined. Abstract: The paper discusses that the filtration of castings influences the deformed resistance. The article describes the change in toughness in castings using filtration during casting and subsequent changes in mechanical properties after forming these castings. Subsequently, the volumetric compressibility of samples of the same material was monitored. The chosen material is aluminium alloy due to good formability. The mechanical properties after forming on the filtered casting were compared with the casting without filtration. The essence of the tests is to ensure the behaviour of the material in two mutually different environments and to compare the size of the barrel and the susceptibility to cracking on the circumference of the samples. The experiment confirmed the effectiveness of filtering and its effect on the forming force. Abstract: The results of a survey of the reliability of automobile trains in the composition of MERCEDES-BENZ 1844 ACTROS LS trucks and semi-trailers KÖGEL, KRONE, SCHMITZ at different stages of operation are presented. The malfunctions of units and assemblies are revealed, regularities are established, the causes of malfunctions and failures are determined.