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    Wyświetlanie 1-4 z 4
    Tytuł:
    Quality management of industrial production in field of machine manufacturing
    Autorzy:
    Ciofu, C.
    Pintilie, U.
    Nedelcu, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/408925.pdf
    Data publikacji:
    2011
    Wydawca:
    Politechnika Śląska
    Tematy:
    zarządzanie jakością
    produkcja maszyn
    jakość produktu
    analiza ekonomiczna
    quality management
    machine manufacturing
    product quality
    economic analysis
    Opis:
    In the current economic situation, the diversification and competitive of the products offer, globalization of the markets, a continued growth of customers' requirements, improve a product quality, increasing the technical level and improving manufacturing technologies. For all of companies it is a priority to satisfy those customers and market requirements. In the article the main issues related with the evolution of ways of ensuring products quality like: availability-reliability-maintenance relationship, measuring quality aspects through quality characteristics, quality economy in terms of quality costs and quality control, were considered and analyzed. Recommendations for improving of production quality process such as: continuous improvement of product technological conception and constructive one using advanced processes, increasing concerns for quality assurance embodied in the increasing of production prevention costs in total, in parallel with decreasing the latter and continuous training of staff were presented.
    Źródło:
    Wybrane Problemy Inżynierskie; 2011, 2; 65-72
    2083-1021
    Pojawia się w:
    Wybrane Problemy Inżynierskie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Flow simulation of the two-component plastic injection process with reinforced parts
    Autorzy:
    Mîndru, T.
    Ciofu, C.
    Nedelcu, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/408933.pdf
    Data publikacji:
    2011
    Wydawca:
    Politechnika Śląska
    Tematy:
    proces wtrysku
    tworzywo sztuczne
    wzmocnienie metaliczne
    symulacja komputerowa
    Cosmos
    injection process
    plastics
    metallic reinforcement
    computer simulation
    cosmos
    Opis:
    This paper presents a simulation of two-component injection process for obtaining plastic parts with metallic reinforcement using a specific software package, MoldFlow. It will consider the following process parameters, mould temperature and injection pressure. The study will analyze the comparison between plastic parts with and without metallic reinforcement. It will highlight the differences that occur between the input parameters, mould temperature and injection pressure and the out parameters, cooling time and injection time for those types of parts obtained. Furthermore will be simulated a mechanical stresses of traction using a specific software package, Cosmos, for both parts obtained.
    Źródło:
    Wybrane Problemy Inżynierskie; 2011, 2; 261-266
    2083-1021
    Pojawia się w:
    Wybrane Problemy Inżynierskie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The structural analysis of composite materials reinforced with SI-C particles
    Autorzy:
    Nedelcu, D.
    Chelariu, R.
    Ciofu, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/409075.pdf
    Data publikacji:
    2011
    Wydawca:
    Politechnika Śląska
    Tematy:
    materiały kompozytowe
    SI-C cząsteczki
    kompozytowa mieszanina
    composite materials
    SiC particles
    composite mixing
    Opis:
    The composite materials with particles consisting of a basic material (matrix) embedded particles of one or more materials. The particles can be metallic or nonmetallic, as the matrix can be, metalic or non metalic. Like a first step the composite mixing involves the embedded process analysis of SiC particles in molten metal. The main issues considered relate to some aspects of embedding additional material in molten metal and methods of achieving the best possible including it. From this point of view was used the overheat of metalic matrix. The experimental plan was followed by Taguchi and structural analysis made was focus on four from 16 completed experimental researches. Six parameters were used each one has two levels. Also the micrographs corresponding experimental tests are presented.
    Źródło:
    Wybrane Problemy Inżynierskie; 2011, 2; 273-280
    2083-1021
    Pojawia się w:
    Wybrane Problemy Inżynierskie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Some Aspects of Processing and Properties of Composite Material with Si-C Particles
    Autorzy:
    Nedelcu, D.
    Carcea, I.
    Tabacaru, L.
    Ciofu, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/1503738.pdf
    Data publikacji:
    2011-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Mh
    81.05.Ni
    81.05.Pj
    81.05.Qk
    12.60.Rc
    Opis:
    The processing of composite materials with metal matrix reinforced with carbon particles, graphite or SiC (Silicon Carbide) is decisively determined by the transfer of the reinforcing particles from the gaseous atmosphere into the molten metal and then by their transfer from liquid into solid. The degree of incorporation, the uniformity of particle distribution and finally all the properties of the composite materials depend on the way in which the transfer conditions from one phase to another have been accomplished. According to the thermodynamic principles, the transfer of the reinforcing particles from one phase to another can happen without external energy input only if the variation of the total free enthalpy is negative. The estimation of the direction of transfer can be done after the determination of critical measurements to the balance of forces that act on the reinforcing element. The particles wetted by the liquid metal and with density of its nearest will be integrated in the melt without external energy input, and those dry and light need additional energy consumption (powder injection, melt stirring etc.). The stalling speed of the SiC particles to the gas/liquid interface is influenced by the density difference and the reinforcing particles size. The critical moving speed of the solidification front is decisively influenced by the difference between $σ_{PS}$ and $σ_{PS}$, inter-phase tensions, as well as by the reinforcing particles size, if their density significantly differs from the one of the liquid alloy. Compared with the initially used alloy, the pull strength is doubled for some samples of obtained composite material. The ultrasonic testing disclosed the presence of some very small spots (porosities) which don't have a major influence on the tensile specimens subjected to pulling. From this reason, a very clear display of the bottom echo can be observed, which justifies the uniformity of the casting process. At the level of the matrix, the presence of the carbon to the separation limit between matrix and reinforcement can be observed, which confirms that during the processing Aluminium Carbide $Al_{4}C_{3}$ has been formed. The presence of these carbides considerably improves the wetting process.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 2; 344-347
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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