Univerzitná knižnica - Vedecké odborné časopisy
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Item Technológ - celé číslo 2/2024(University of Žilina, 2024)Item Barkhausenov šum po dynamickom guľôčkovaní duplexnej ocele AlSi 318(University of Žilina, 2024) Mičietová, Anna; Uríček, Juraj; Čilliková, Mária; Neslušan, MiroslavThis paper deals with surface integrity and the corresponding Barkhausen noise after shot peening of duplex steel AlSi 318 under variable shot-peening conditions such as number of passes and applied air pressure. Surface state is investigated from the point of view of surface roughness and surface plastic deformation. Barkhausen noise is decreasing along with increasing surface coverage as well as increasing air pressure. The duplex matrix is considered being stable with respect of volume fraction between austenite and ferrite and the whole Barkhausen noise signal originates from ferromagnetic ferrite. Progressively developed plastic deformation increases dislocation density in the surface as a result of surface bombardment by shots which in turn shift Barkhausen envelopes into higher magnetic fields.Item Konštrukčná úprava strižných hrán(University of Žilina, 2024) Moravec, JánThe contribution is devoted to geometrical questions related to the issue of adjusting the active parts of the cutting tool. There are three modifications of the cutters: With the blade beveled inward and bevelled outward, the blades formed by the intersection of two cylinders. The necessary schemes of these solutions and the necessary mathematical relations are published.Item Problematika logistiky pri skladovaní tvárniacich nástrojov a otázka opotrebovania činných dielov(University of Žilina, 2024) Melo, BorislavThe article deals with the specific issue of the logistics of forming tools within the company. The submitted contribution in a brief overview points to possible situations that may arise in the production process when applying forming tools. It is also pointed out the possibilities of solving the situations that arise in the production preparation stage. An addition is also pointing out the issue of wear and tear of active parts of clippers and their renovation.Item Vplyv teploty na Barkhausenov šum v Co a Gd(University of Žilina, 2024) Neslušan, Miroslav; Čížek, Jakub; Mičietová, Anna; Čilliková, MáriaThe present paper deals with Barkhausen noise emission in Gd. Barkhausen noise emission was investigated in the temperature range mainly below the Gd Curie temperature when the spontaneous magnetization in Gd occurs. Barkhausen noise from the heavy rare-earth Gd is compared with Barkhausen noise emission from the transition metal Co measured at the same magnetizing and other conditions. This study demonstrates that Barkhausen noise emitted from Gd is much weaker than that originating from Co. This is a consequence of different spin exchange interaction among the neighbouring atoms, domain wall thickness as a well as domain wall energies. Moreover, Barkhausen noise is temperature sensitive especially for Gd sample as a result of the altering magneto-crystalline anisotropy.Item Konštrukčný návrh koľajového adaptéra pre ľahké nákladné vozidlo, typ oceľ-oceľ(University of Žilina, 2024) Dižo, Ján; Fiačan, Jakub; Lovska, Alyona; Blatnický, Miroslav; Ishchuk, VadymTransportation is a quite complex system for relocation of passengers and goods for longer of shorter distances. Nowadays, a combination of several types of transport is typical for the most countries. Land transport includes road transport and railway transport. There are number of types of vehicles used for these individual kinds of transport. The most of them are able to move only on a road or on a railway track. However, there are a quite narrow group of vehicles, which can move both on a road and on a railway track. There are called rail-road vehicles. In principle, there are derived from road vehicle. The main objective of this rticle is to present an engineering design of an adapter for a light lorry. The work brings the main structural units of the rail-road vehicle and compares its properties with the previous engineering design. Despite, there are rail-road vehicles, this engineering design is characterized, that the adapter allows to set railway wheels to main track gauge.Item Kovokeramické trecie materiály využívané v práškovej metalurgi(University of Žilina, 2024) Kantoríková, ElenaMetal-ceramic materials are produced from a mixture of metal and ceramic powders. These are primarily sintered carbides for cutting tools and friction materials for brake linings. Their use is important in cases where it is not possible to use normal friction materials. Important is a high coefficient of friction even at high temperature, good thermal conductivity, strength and resistance to abrasion.Item Interpretácia nových pravidiel pre používanie požiadaviek pre charakter povrchu - profil(University of Žilina, 2024) Bronček, Jozef; Konstantová, Viera; Drbúl, MárioThe international standard STN EN ISO 21920-1 specifies the rules and methodology for marking the character of the surface profile by profile methods in the technical documentation of the product using graphic marks. The aim of the article is to familiarize the public with the content of the standard included in the Geometrical Product Specification (GPS) system. The changes in the area of default settings concern the introduction of new rules for acceptance of tolerance. The rules determine how the tolerance limits are applied to the measured values of the parameters. The introduced changes benefit the majority of users for prescribing, manufacturing and checking product requirements.Item Kinematická analýza paralelných mechanizmov pomocou Screw theory(University of Žilina, 2024) Michalková, Mária; Guldan, VladimírThe aim of this paper is to summarise the mathematical basics of the Screw theory and its application in mechanics. The paper provides methodology for finding the degrees of freedom of the effector, as well as for determining its mobility. Furthermore, we give an input-output equation for velocities for the parallel mechanism, that allows to obtain the velocities of the effector and also of the actuated kinematic couples. These algorithms are applied to a planar parallel 3-RTR mechanism where we determine the degrees of freedom and mobility of the moving platform. We determine the input-output equation for velocities, and based on this we investigate the singularities of the moving platform.Item Simulácia zvárania heterogénneho zvarového spoja v programe Sysweld(University of Žilina, 2024) Koňár, RadoslavThe article deals with the analysis and subsequent simulation of a heterogeneous butt weld joint. Specifically, it is a combination of S355 steel and AlSI316 anti-corrosion steel. The welding simulation was based on a real experiment, during which several quantities were measured and analyzed, which served to define the boundary conditions for the simulation. The result of the analysis is the calculation of temperature fields and deformations for a heterogeneous joint, as well as monitoring the influence of different steels on the welding process and heat propagation.