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    Wyświetlanie 1-4 z 4
    Tytuł:
    The Effect of the Quenching Method on the Deformations Size of Gear Wheels after Vacuum Carburizing
    Autorzy:
    Dybowski, K.
    Sawicki, J.
    Kula, P.
    Atraszkiewicz, R.
    Lipa, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/352890.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    thermo-chemical treatment
    vacuum carburizing
    carburized layer
    quenching
    quenching deformations
    low-pressure carburizing
    Opis:
    This paper presents a comparison of the deformations and residual stresses in gear wheels after vacuum carburizing process with quenching in high-pressure nitrogen and oil. The comparison was made on a medium-sized gear wheels, made of AMS6265 (AISI 9310) steel. This steel is applied in the aerospace industry for gears. The study has provided grounds for an assessment of the effect of the method of quenching on the size of deformations. Compared to oil quenching, high-pressure gas quenching following vacuum carburizing resulted in more uniform and smaller deformations.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 2B; 1057-1062
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The influence of grinding conditions on the distribution of residual stress in the surface layer of 17CRNI6-6 steel after carburizing
    Autorzy:
    Sawicki, J.
    Kruszyński, B.
    Wójcik, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/102186.pdf
    Data publikacji:
    2017
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    synergism
    residual stress
    carburizing
    grinding
    cutting fluids
    Opis:
    This paper presents the results of a study aimed at determining the residual stress which results from developing the surface layer by low-pressure and conventional carburizing and grinding of 17CrNi6-6 steel. A synergistic effect of thermochemical and abrasive treatment was examined on ring samples used to study residual stress by Davidenkov’s method. Samples were subjected to vacuum carburizing and conventional carburizing, which was followed by grinding with a 38A60K8V aloxite grinding wheel and a CBN grinding wheel - RNB80/63B75V. The following cutting fluids were used during the grinding process: oil emulsion 5%, supply rate ca. 20 l/min, Micro5000 oil supplied at the minimum quantity lubrication (MQL) of ca. 25 ml/h, dry machining. The study determined the effect of the type of grinding wheel and the cooling and lubricating agent on the distribution of residual stress in the surface layer. The best effects of grinding with respect to the residual stress were achieved with flood cooling with oil emulsion and grinding with a CBN grinding wheel.
    Źródło:
    Advances in Science and Technology. Research Journal; 2017, 11, 2; 17-22
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ nowoczesnych procesów obróbki cieplno-chemicznej i ściernej na właściwości tribologiczne powierzchni
    The influence of modern thermo-chemical and abrasive treatments on tribological properties of the surface
    Autorzy:
    Gawroński, Z.
    Sawicki, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/190510.pdf
    Data publikacji:
    2009
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    nawęglanie
    szlifowanie
    naprężenia własne
    wytrzymałość zmęczeniowa
    carburizing
    grinding
    residual stresses
    fatigue strength
    Opis:
    W referacie przedstawiono właściwości warstwy wierzchniej uzyskane w procesie nawęglania próżniowego i konwencjonalnego oraz po szlifowaniu ściernicami nowej generacji. Przeanalizowano właściwości użytkowe warstwy wierzchniej (naprężenia własne, mikrotwardość, mikrostrukturę). Określono równocześnie wpływ wyżej wymienionych parametrów na odporność na zużycie i współczynnik tarcia materiału przy ślizganiu. Przeprowadzone badania wykazały, że znacznie korzystniejsze właściwości użytkowe wykazuje technologia nawęglania próżniowego z następującym po nim szlifowaniem ściernicami borazonowymi.
    The properties of the surface layers obtained in the conventional and vacuum carburising processes and after grinding with modern grinding wheels are presented in this paper. Service properties of the surface layers were analysed (residual stresses, microhardness and microstructure). The influences of aforementioned parameters on wear resistance and friction coefficient during sliding were determined. Tests revealed that the process of vacuum carburising followed by CDN grinding gives much better service properties.
    Źródło:
    Tribologia; 2009, 4; 51-59
    0208-7774
    Pojawia się w:
    Tribologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of grinding conditions of gears made of 20MnCr5 steel after single-piece flow heat treatment on the condition of the surface layer of the tooth working surface
    Autorzy:
    Stachurski, W.
    Janica, J.
    Januszewicz, B.
    Pawłowski, W.
    Sawicki, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/24200636.pdf
    Data publikacji:
    2023
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    thermo-chemical treatment
    vacuum carburizing
    single-piece flow method
    gear grinding
    technological surface layer
    obróbka cieplno-chemiczna
    nawęglanie próżniowe
    jednoczęściowa metoda przepływowa
    szlifowanie kół zębatych
    technologiczna warstwa wierzchnia
    Opis:
    Purpose: The paper investigated the effect of selected processing conditions during gear grinding on the value and distribution of microhardness and residual stress formed in the technological surface layer of gears after thermochemical treatment (TCT) conducted by a continuous single-piece flow method. Design/methodology/approach: The gears were carburised with LPC at 920°C, then quenched in a 4D Quenching chamber at 7 bar and tempered at 190ºC for 3 hours. In the next step, the working surfaces of the gear teeth were ground by supplying grinding fluid (GF) to the grinding zone using the WET method and the MQL method with a minimum amount. Measurements were made on the distribution of microhardness and residual stress formed in the technological surface layer of gears after thermochemical treatment and after the grinding process. Findings: The results of the study showed the influence of workpiece speed vw and the method of delivery to the grinding zone GF on selected parameters describing the condition of the technological surface layer of the teeth of gears made of 20MnCr5 steel. The grinding process with a white aluminium oxide grinding wheel causes deterioration in the material's residual stress state. For each of the three analysed workpiece speeds vw, smaller changes in microhardness with respect to the microhardness of the material before grinding occur in the surface layer of samples ground with GF fed with the MQL method. Similarly, residual stress values are in the area of favourable compressive stresses. Research limitations/implications: Environmental considerations and the need to comply with increasingly stringent environmental protection and worker safety regulations are pushing researchers and entrepreneurs to completely eliminate or reduce the consumption of grinding fluids in the grinding process. Based on the research and analysis carried out in this study, it was concluded that applying minimum GF by the MQL method could be an alternative to the conventional WET method.Practical implications: In sustainable manufacturing, it is extremely important to produce high-quality items while reducing the cost of manufacturing and taking care of the environment and workers' health. This includes the manufacture of gears, a basic component used in gear transmissions in the automotive industry, for example. The research has established that it is possible to use the MQL method, which reduces the amount of GF used when grinding the working surfaces of gear teeth, as an alternative to the conventional WET method. Originality/value: The conducted research was the first to determine the most favourable conditions, in terms of the obtained residual stresses and microhardness, for grinding the working surface of gear teeth using the MQL method.
    Źródło:
    Archives of Materials Science and Engineering; 2023, 120, 2; 60--69
    1897-2764
    Pojawia się w:
    Archives of Materials Science and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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