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    Wyświetlanie 1-2 z 2
    Tytuł:
    Improving work organisation in the production hall – a case study
    Autorzy:
    Zasadzień, Michał
    Powiązania:
    https://bibliotekanauki.pl/articles/1929133.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    VSM
    logistics
    process
    one piece flow
    stock
    5 WHY
    lean manufacturing
    logistyka
    proces
    przepływ jednoczęściowy
    zapas materiałów
    Opis:
    Purpose: The aim of the research was to assess the effectiveness of implementing Lean Manufacturing (One-Piece-Flow) elements in a company producing shock absorbers. Design/methodology/approach: With the help of VSM, the most important problem in the production process was diagnosed, and by using the 5 Whys tool, the root causes of the problems were identified. A simulation of introducing the One-Piece-Flow system into the production line was then used to estimate the most optimal solution. After choosing the solution, it was implemented, and the results obtained were verified. Findings: As a result of the conducted analyses, the most important problems related to planning, scheduling and the flow of intermediates were identified. The 5 Whys analysis allowed for the grouping of individual problems by common causes. Detailed solutions to the problems were proposed, which were included in the future Value Stream Map. Research limitations/implications: Conducting research in a working production process is limited and faces significant resistance from managers. Practical implications: The most important effects of implementing an improvement plan were minimising inventory from 138,062 units to 25,000 units, which reduced costs and indicates reduced waste. Lead time was limited to 9.67 days from 56.96 days. Originality/value: Research results confirm the effectiveness of introducing only some solutions of the Lean philosophy. This is particularly important if the enterprise is unable to comprehensively implement the Lean Manufacturing concept due to organisational or financial reasons.
    Źródło:
    Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska; 2020, 147; 327-350
    1641-3466
    Pojawia się w:
    Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The influence of workpiece speed on microhardness and residual stresses in vacuum-carburised 20MnCr5 steel using the single-piece flow method
    Autorzy:
    Sawicki, J.
    Januszewicz, B.
    Sikora, M.
    Witkowski, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/24200559.pdf
    Data publikacji:
    2022
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    surface grinding
    microhardness
    residual stress
    vacuum carburising
    single-piece flow
    szlifowanie powierzchni
    mikrotwardość
    naprężenie szczątkowe
    nawęglanie próżniowe
    przepływ jednoczęściowy
    Opis:
    Purpose: To determine the impact of selected conditions of abrasive treatment on the value and distribution of microhardness and residual stresses in layers carburised by a continuous single-piece flow method. Design/methodology/approach: Reference pieces were low pressure carburised at 920°C and then heat-treated in a 4D Quench heat treatment chamber at a pressure of 7 bar and tempered at 190ºC for 3 hours. In the next stage, samples were ground at various vw piece speeds, introducing grinding fluid into the cutting zone using the WET spraying method or using the MQL method at a minimum flow rate. The distribution of microhardness and residual stresses generated in the technological outer layer of the pieces following heat and chemical treatment and the grinding process was measured. Findings: Results of the tests indicated that the vw piece speed and method used to supply cooling and lubricating fluid to the grinding zone had an impact on selected parameters of the technological outer layer of flat samples made of 20MnCr5 steel. The process of grinding using an electrocorundum grinding wheel results in a deterioration of residual stresses in the material. For each of the three analysed vw piece speeds, reduced changes in material microhardness prior to cutting occur in the outer layer of samples ground using GF supplied at a minimum flow rate using the MQL method. Research limitations/implications: Environmental considerations and having to conform to increasingly stringent regulations related to environmental protection and employee safety motivate researchers and businesses to entirely eliminate or reduce the use of grinding fluids in the grinding process and, therefore, to optimise grinding technology. Practical implications: Modern manufacturing industry requires the grinding process, which follows heat and chemical treatment, to be performed with the highest possible efficiency. However, retaining high parameters of the technological outer layer in comparison to the sample material following vacuum carburisation (before grinding) is extremely difficult. An optimised configuration of parameters of the grinding process and method of supplying grinding fluids enables meeting the current and future high expectations of the industry in this regard. Originality/value: The tests have enabled us to determine the impact of the applied vw workpiece speed and method of supplying grinding fluid on microhardness and residual stresses. Generally speaking, grinding with an electrocorundum grinding wheel results in a deterioration of residual stresses. For both methods of supplying GF (WET and MQL), the distribution of microhardness in the material of the samples ground with the highest workpiece speed (18.0 m/min) indicated no significant differences with regard to the distribution of microhardness in the material of the samples following heat and chemical treatment.
    Źródło:
    Archives of Materials Science and Engineering; 2022, 115, 2; 66--75
    1897-2764
    Pojawia się w:
    Archives of Materials Science and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-2 z 2

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