Ústav výrobních strojů, systémů a robotiky

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    Influence of Machine Tool Operating Conditions on the Resulting Circularity and Positioning Accuracy
    (MDPI, 2024-05-20) Sarvaš, Matej; Holub, Michal; Marek, Tomáš; Procházka, Jan; Bradáč, František; Blecha, Petr
    The operating conditions of the production process significantly influence the resulting dimensional and form accuracy of the workpiece. The operating conditions include the position of the workpiece location, with internal and external heat sources influenced not only by the machine location but also by its operation. In addition, there are the cutting conditions and the feed rate requirements of CNC machine tools. These changes, such as workpiece position, feed rates, and machine heat load, are further reflected in the ability of the machine to run at the position required and interpolate within the given tolerances of circularity. For the accuracy and repeatability of positioning, the machine was set up according to ISO 230-2 and for the circular interpolation tests according to ISO 230-4. The obtained results show the importance of attention to the appropriate setting of the operating conditions of the production process, where the knowledge of the geometric accuracy of the CNC machine tool in its working space can systematically increase the manufacturing accuracy itself or be another tool suitable for predicting the dimensional and form accuracy of workpieces.
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    Textura povrchu Profilové a plošné parametry
    (Vysoké učení technické v Brně; Fakulta strojního inženýrství; Ústav výrobních strojů, systémů a robotiky, 2024-09-09) Jankových, Róbert; Polzer, Aleš
    Textura povrchu - popis profilových a plošných parametrů dle norem řady: ČSN EN ISO 4287, 4288; 13565 a 21920.
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    Analysis of the machinability of copper alloy Ampcoloy by WEDM
    (MDPI, 2020-02-11) Mouralová, Kateřina; Beneš, Libor; Prokeš, Tomáš; Bednář, Josef; Zahradníček, Radim; Jankových, Róbert; Fries, Jiří; Vontor, Jakub
    The unconventional technology wire electrical discharge machining is widely used in all areas of industry. For this reason, there is always an effort for efficient machining at the lowest possible cost. For this purpose, the following comprehensive study has been carried out to optimize the machining of the copper alloy Ampcoloy 35, which is particularly useful in plastic injection moulds. Within the study a half-factor experiment of 25-1 with 10 axial points and 7 central points of a total of 33 rounds was carried out, which was focused on the response monitoring of the input factors in the form of the machine parameters setup: gap voltage, pulse on time, pulse off time, discharge current, wire speed. Based on the study of the response in the form of cutting speed and surface topography, their statistical models were created, while the optimal setting of machine parameters was determined to maximize the cutting speed and minimize the topography parameters. Further, a detailed cross-sectional analysis of surface and subsurface layer morphology was performed using electron microscopy including the chemical composition analysis. In order to study microstructural changes in the material at the atomic level, a lamella was created, which was then studied using a transmission electron microscope.
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    Risks in industrial management systems
    (MM Science Jurnal, 2016-12-01) Kotek, Luboš; Nosek, Aleš; Fiala, Alois; Bartoš, Vojtěch
    This paper focuses on the evaluation of the approach to risk management in management systems in technical industries. The underlying framework is the updated standard ISO 9001 which is compared to the requirements of specific standards for the automotive industry, the aviation industry, the railway industry and the chemical and processing industries that fall under major accident prevention (SEVESO). This article aims to compare the requirements of these management systems for individual areas from the perspective of systemic risk prevention.
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    VÝŠKOVÉ PARAMETRY TEXTURY POVRCHU
    (MM publishing, s.r.o., 2014-11-13) Jankových, Róbert; Bumbálek, Bohumil
    V normě ČSN EN ISO 25178-2 je definováno celkem 7 výškových parametrů textury povrchu. Jejich české názvy byly vytvořeny překladem z evropské normy EN ISO 25178-2:2012. V první části článku jsou uvedeny navržené změny v názvosloví jednotlivých parametrů, které vznikly na základě analogie názvů profilových parametrů. V další části je pro názornost uveden příklad hodnocení textury dvou vybraných povrchů pomocí těchto výškových parametrů.