Technológ - Ročník 17.; Číslo 3/2025

Permanent URI for this collectionhttps://drepo.uniza.sk/handle/hdluniza/1336

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Explozívne tvárnenie dielcov a jeho podstata
(University of Žilina, 2025) Moravec, Ján; Melo, Branislav
The article focuses on explosive forming of metals, in this case pipes, where the text provides the necessary information about the process of this type of forming. In the second part, based on knowledge from the theory of metal forming, a theoretical analysis of the process is given.
How heat treatment affects tool steels
(University of Žilina, 2025) Kantoríková, Elena
The properties of steels cannot be determined solely by their chemical composition. Their final characteristics depend to a large extent on the applied processing methods - whether thermal, chemical, a combination of chemical and thermal, or thermomechanical treatment. When these processes are carried out properly, steels gain the required qualities and their durability is extended. This paper presents an overview of heat treatment techniques for tool steels. Understanding these principles is essential for the effective application of heat treatment and for minimizing the extent of subsequent finishing operations.
Interakcia medzi materiálom, tepelným spracovaním a pevnostným výpočtom v návrhu ozubených prevodov
(University of Žilina, 2025) Maláková, Silvia; Kepeň Harachová, Daniela
This paper investigates the complex interaction between material selection, heat treatment processes, and strength calculation methodologies in the design of gear transmissions. The mechanical performance and durability of gears are highly dependent on the choice of base material and the subsequent thermal treatments applied to optimize their microstructure and mechanical properties. We analysed how different heat treatment techniques, such as carburizing, quenching, and tempering, influence the microstructural characteristics and fatigue strength of common gear materials. Furthermore, the study evaluates how these material and heat treatment factors are integrated into strength calculation models used in gear design to predict operational lifespan and reliability. Experimental data and numerical simulations are employed to validate the correlation between processing parameters and gear performance. The findings highlight the critical role of a holistic design approach that considers material properties, heat treatment parameters, and accurate strength calculations to enhance gear transmission efficiency and longevity.
Nové prototypy pneumatických pružných hriadeľových spojok a ich očakávané vlastnosti
(University of Žilina, 2025) Urbanský, Matej; Grega, Robert; Žuľová, Lucia; Krajňák, Jozef
In our workplace, we deal with research of pneumatic flexible shaft couplings in the long term. Our main goal is to minimize dangerous torsional vibration in mechanical systems, using pneumatic flexible couplings as torsional vibration active tuners. Therefore, many pneumatic couplings prototypes have to be manufactured and tested. In this article, two new prototypes of pneumatic flexible shaft couplings and their expected properties are presented. The couplings were manufactured according to granted patents.
Súčasné materiálové riešenia pre ozubené kolesá
(University of Žilina, 2025) Kepeň Harachová, Daniela; Maláková, Silvia
Gears are very common machine components that enable precise transmission of rotational motion and power transmission from shaft to shaft. High demands are placed on the function of gears in operation. They must enable precise, uniform transmission, must not cause noise, often have to transmit large forces, etc. Gears are manufactured from a variety of materials and with different performance specifications depending on the industrial application. Gear materials are required to have high strength, toughness and wear resistance because gears rely on their own design size and material strength to withstand external loads. Material manufacturability is also necessary due to the complex shape of the gear and the high precision requirements of the gear. This study highlights trends in gear materials that are moving towards ultra-high strength, high wear resistance, high temperature resistance, corrosion resistance, and low weight.
Technológ - celé číslo 3/2025
(University of Žilina, 2025)
Technologické riešenia výroby komponentu koľajového vozidla
(University of Žilina, 2025) Bučko, Martin; Samaš, Vladimír; Slušňák, Patrik; Kravchenko, Oleksandr
This study provides a comprehensive analysis of four key manufacturing technologies for metallic components: welding, casting, CNC machining, and sheet metal bending. The aim is to compare their technical characteristics, economic aspects, and application potential, with particular attention to the production of a loadbearing component of a railway bogie. The results show that each technology offers distinct advantages and limitations, and the optimal choice depends on several factors such as required precision, production costs, time efficiency, and batch size. Welding ensures high strength but introduces residual stresses and potential defects in the joint area. Casting enables the production of complex or large components with cost-effectiveness in mass production but carries risks of porosity and internal stresses. Sheet metal bending allows fast and economical manufacturing of lightweight components, although limited by material thickness and cracking risks. CNC machining provides the highest precision and surface quality, yet it is the most time- and cost-intensive method, making it more suitable for prototypes or secondary finishing. Overall, the study highlights that the selection of the most appropriate technology should be guided primarily by time and volume requirements, with bending favored for rapid and small-batch production, while casting proves more efficient for large-scale manufacturing.