Browsing Ústav strojírenské technologie by Title

Now showing items 1-20 of 38

  • Analysis of Machinability and Crack Occurrence of Steels 1.2363 and 1.2343ESR Machined by Die-Sinking EDM 

    Mouralová, Kateřina; Beneš, Libor; Bednář, Josef; Zahradníček, Radim; Prokeš, Tomáš; Fries, Jiří (MDPI, 2020-04-19)
    Die-sinking electric discharge machining (EDM) is an indispensable technological operation, especially in the production of molds and all internal and external shapes and cavities. For this reason, the effect of machine ...

  • Analysis of Surface State after Turning of High Tempered Bearing Steel 

    Čilliková, Mária; Mičietová, Anna; Čep, Robert; Jacková, Martina; Minárik, Peter; Neslušan, Miroslav; Kouřil, Karel (MDPI, 2022-02-24)
    This paper investigates surface state after turning of the high tempered bearing steel 100Cr6 with a hardness of 40 HRC. White layer (WL) thickness and its microhardness, as well as surface roughness, are investigated as ...

  • Analysis of the machinability of copper alloy Ampcoloy by WEDM 

    Mouralová, Kateřina; Beneš, Libor; Prokeš, Tomáš; Bednář, Josef; Zahradníček, Radim; Jankových, Róbert; Fries, Jiří; Vontor, Jakub (MDPI, 2020-02-11)
    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, ...

  • Application of Carbon–Flax Hybrid Composite in High Performance Electric Personal Watercraft 

    Zouhar, Jan; Slaný, Martin; Sedlák, Josef; Joska, Zdeněk; Pokorný, Zdeněk; Barényi, Igor; Majerík, Jozef; Fiala, Zdeněk (MDPI, 2022-04-26)
    Within the herein presented research, we studied the applicability of flax fabrics for composite parts in personal watercrafts in order to enhance damping of vibrations from the engine and noise reduction (which is relatively ...

  • Assessment of Retained Austenite in Fine Grained Inductive Heat Treated Spring Steel 

    Olina, Anna; Píška, Miroslav; Petrenec, Martin; Hervoches, Charles; Beran, Přemysl; Pechoušek, Jiří; Král, Petr (MDPI, 2019-12-05)
    Advanced thermomechanical hot rolling is becoming a widely used technology for the production of fine-grained spring steel. Different rapid phase transformations during the inductive heat treatment of such steel causes the ...

  • Change in Dimensions and Surface Roughness of 42CrMo4 Steel after Nitridation in Plasma and Gas 

    Dobrocký, David; Pokorný, Zdeněk; Joska, Zdeněk; Sedlák, Josef; Zouhar, Jan; Majerík, Jozef; Studený, Zbyněk; Procházka, Jiří; Barényi, Igor (MDPI, 2022-10-06)
    The influence of plasma nitriding and gas nitriding processes on the change of surface roughness and dimensional accuracy of 42CrMo4 steel was investigated in this paper. Both processes almost always led to changes in the ...

  • Changes in the surface layer of rolled bearing steel 

    Zemčík, Oskar; Sedlák, Josef; Chladil, Josef (ČVUT, 2015-10-31)
    This paper describes changes observed in bearing steel due to roller burnishing. Hydrostatic roller burnishing was selected as the most suitable method for performing roller burnishing on hardened bearing steel. The ...

  • Characterization of Microstructural Damage and Failure Mechanisms in C45E Structural Steel under Compressive Load 

    Kraišnik, Milija; Čep, Robert; Kouřil, Karel; Baloš, Sebastian; Antić, Aco; Milutinović, Mladomir (MDPI, 2022-03-19)
    In this paper, the microstructural damage evolution of a steel with a ferrite-pearlite microstructure (C45E) was investigated during the process of cold upsetting. The development and the accumulation of microstructural ...

  • Cutting Force When Machining Hardened Steel and the Surface Roughness Achieved 

    Osička, Karel; Zouhar, Jan; Sliwková, Petra; Chladil, Josef (MDPI, 2022-11-13)
    This article deals primarily with the problem of determining the cutting force when machining hardened steels. For this study, the steel used was 100 Cr6, number 1.3505. The secondary aspects of the study focused on the ...

  • Decalcification resistance of various alkaliactivated materials 

    Hrubý, Petr; Bílek, Vlastimil; Topolář, Libor; Kalina, Lukáš; Marko, Michal; Šoukal, František; Dvořák, Richard; Herčík, Tomáš (IOP Publishing, 2021-09-29)
    The resistance of alkali-activated materials (AAMs) to degradation processes, particularly the decalcification, was studied in this paper. The ground granulated blast furnace slag was alkali-activated using various activators ...

  • Determination of Carbon Steel Dynamic Properties 

    Jopek, Miroslav (Jan Evangelista Purkyne University in Usti nad Labem, 2021-09-18)
    Taylor anvil test is one of the dynamic test method in which we can determine the dependences of strain, strain rate, temperature on flow stress. With this method, we can determine in each cross sec-tion or along axial ...

  • Determining Johnson-Cook Constitutive Equation for Low-Carbon Steel via Taylor Anvil Test 

    Kunčická, Lenka; Jopek, Miroslav; Kocich, Radim; Dvořák, Karel (MDPI, 2021-08-25)
    Tristal steel is low-carbon construction-type steel widely used in the automotive industry, e.g., for braking components. Given the contemporary demands on the high-volume production of such components, these are typically ...

  • Effect of Higher Silicon Content and Heat Treatment on Structure Evolution and High-Temperature Behaviour of Fe-28Al-15Si-2Mo Alloy 

    Švec, Martin; Vodičková, Věra; Hanus, Pavel; Pazourková Prokopčáková, Petra; Čamek, Libor; Moravec, Jaromír (MDPI, 2021-06-01)
    This paper describes the structure and properties of cast Fe3Al-based alloy doped with 15 at. % of silicon and 2 at. % of molybdenum. The higher content of silicon is useful for the enhancement of high-temperature mechanical ...

  • The Effect of Simultaneous Si and Ti/Mo Alloying on High-Temperature Strength of Fe3Al-Based Iron Aluminides 

    vodickova, vera; Švec, Martin; Hanus, Pavel; Novák, Pavel; Záděra, Antonín; Keller, Vojtěch; Prokopčáková, Petra (MDPI, 2020-08-03)
    The effect of phase composition and morphology on high-temperature strength in the compression of Fe-Al-Si-based iron aluminides manufactured by casting was investigated. The structure and high-temperature strength in the ...

  • Experiments with Forming Coated Sheets with Plasma-Chemical Pretreatment of the Surface 

    Schwarzer, Emil; Dvořák, Milan (Scientific Research Publishing Limited, 2016-06-30)
    The article used new experimental equipment for effective testing of adhesion coatings on the sheets. Testing was performed in jig by bending roller with selected radius. In the context of experiments a multi-jet system ...

  • Fatigue Life of 7475-T7351 Aluminum After Local Severe Plastic Deformation Caused by Machining 

    Ohnišťová, Petra; Píška, Miroslav; Petrenec, Martin; Dluhoš, Jiří; Horníková, Jana; Šandera, Pavel (MPDI, 2019-11-03)
    The fatigue properties of thermo-mechanically treated and machined aluminum alloy 7475-T7351 have been studied. The applied advanced machining strategy induced intensive plastic deformation on the machined surface under ...

  • Hardened Steels and Their Machining 

    Osička, Karel; Chladil, Josef (MDPI, 2021-02-12)
    This article discusses the issue of hardened steel machining. Many components in theengineering industry use hardening as the final heat treatment. These components usually occupya significant position in a given assembly ...

  • Heterogenous Weld of Heat Resistant Steel With Cobalt Alloy 

    Sigmund, Marian (Manufacturing Technology, 2021-10-22)
    The article describes problems of welding heterogeneous welds be specific of heat resistant steel X15CrNiSi20-25 with cobalt alloy Stellite 6. Heterogeneous welds are produced by GTAW (141 according to standard EN ISO 4063) ...

  • Improving Rotary Draw Bending Process by Changing a Geometry of the Pressure Die 

    Řiháček, Jan; Peterková, Eva; Císařová, Michaela (Jan Evangelista Purkyne University in Usti nad Labem, 2021-10-01)
    The paper is focused on an analysis and optimization of the rotary draw bending process to eliminate bent tube ovality by modification of the pressure die geometry. The bending process is realized on Wafios CNC bending ...

  • Influence of heat treatment and nickel content on the properties of GX4CrNi13-4 steel 

    Kaňa, Václav; Krutiš, Vladimír; Bořil, Petr; Záděra, Antonín; Rimko, Marcel (Polish Academy of Sciences, Institute of Metallurgy and Materials Science, 2020-10-19)
    For the EN GX4CrNi13-4 martensitic stainless steel, research was conducted to investigate the impact of the quenching intensity and the content of nickel on the mechanical properties and amount of retained austenite. It ...