Technológ - Ročník 16.; Číslo 1/2024

Permanent URI for this collectionhttps://drepo.uniza.sk/handle/hdluniza/1069

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Author: search.filters.author.Draganovská, Dagmar

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    Hodnotenie zmeny mikrogeometrie kovového povrchu vzhľadom na aplikačnú dobu fosfátovania
    (University of Žilina, 2024) Draganovská, Dagmar; Guzanová, Anna; Ižaríková, Gabriela
    The contribution is focused on the analysis of the microgeometry of metal surfaces after applying a conversion layer using phosphating. The types of basic materials used in the experiment are uncoated deep drawn steel DC04 and hot-dip galvanized microalloy steel HX340LAD+Z. During the application of the conversion layer, the changes of the microgeometry parameters of the surfaces were studied with respect to the phosphating time, which was 3, 5 and 10 minutes. The paper also deals with the statistical evaluation of roughness parameters of pre-treated surfaces. The achieved results provide information for other technological operations such as the creation of adhesive joints, where the correct anchoring of the adhesive is important for the load-bearing capacity of the joints.
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    Možnosti využitia technológie termálneho vŕtania na účely spájania tenkostenných nerovnakých materiálov v automobilovom priemysle
    (University of Žilina, 2024) Guzanová, Anna; Veligotskyi, Nikita; Draganovská, Dagmar
    The article deals with the study of the applicability of flowdrill technology for the formation of joints between thin metallic materials based on iron and aluminium alloy. This technology is primarily used to create holes in profiles with a local increase in material thickness to accommodate a greater number of threads. If used to drill two interleaved thin-walled materials, a joint is formed as a secondary effect. The quality of the resulting bushings forming the interference fit joint was investigated. The joints were formed using a combination of uncoated deep drawn steel, galvanized HSLA steel and aluminum alloy, in different positions in the joint. Subsequently, tensile shear testing of single joints was performed. The load carrying capacity of the joints was also tested in combination with adhesive bonding. The load capacity of the joints combined with bonding was significantly higher compared to flowdrill joints. The combination of both technologies yields an increase in the absorbed energy of the joint at failure.