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    Wyświetlanie 1-6 z 6
    Tytuł:
    Evaluation of Microwave Heating of Protective Coatings Used in the Lost Foam Technology
    Autorzy:
    Opyd, B.
    Granat, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/382105.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    innovative foundry technology
    microwave
    protective coating
    lost foam
    innowacyjna technologia odlewnicza
    mikrofale
    powłoka ochronna
    tracona piana
    Opis:
    Presented are results of a preliminary research on determining a possibility to use microwave radiation for drying casting protective coatings applied on patterns used in the lost foam technology. Taken were measurements of permittivity εr and loss factor tgδ at 2.45 GHz, as well as attempts were made of microwave drying of a protective coating based on aluminium silicates, applied on shapes of foamed polystyrene and rigid polymeric foam. Time and results of microwave drying were compared with the results obtained by drying at 50 °C by the traditional method commonly used for removing water from protective coatings. Analysis of the obtained drying kinetics curves demonstrated that selection of proper operation parameters of microwave equipment permits the drying time to be significantly shortened. Depending on kind of the pattern material, drying process of a protective coating runs in a different way, resulting in obtaining different quality of the dried coating.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 2; 65-70
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electrical Properties of Multilayer Systems Composed of Foundry Tooling and Moulding Sand
    Autorzy:
    Gal, B.
    Granat, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/381474.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    innovative foundry technology
    microwaves
    electrical properties
    multilayer foundry system
    innowacyjna technologia odlewnicza
    mikrofale
    właściwości elektryczne
    system odlewniczy wielowarstwowy
    Opis:
    Within the research, selected multilayer technological systems created as combinations of water-glass containing moulding sand with foundry tooling, were characterised on the grounds of their electrical properties. By measuring resonance frequency and quality factor of a waveguide resonance cavity, real component of permittivity εr′ and loss tangent tgδ were determined for multilayer foundry systems with various qualitative and quantitative compositions. It was demonstrated that combination of a sandmix and foundry tooling with known dielectric properties results in a system with different physico-chemical properties, whose relation to the parameters of individual components of the system is undefined at this research stage. On the grounds of measurement results, theoretical value of microwave heating power, dissipated in unit volume of the selected multilayer foundry system, was determined. Knowledge of theoretical heating power and evaluation of physical, chemical and structural changes occurring in moulding sands exposed to microwaves in such a technological system makes a ground for empirical modelling of the process of microwave heating of foundry moulds and cores.
    Źródło:
    Archives of Foundry Engineering; 2017, 17, 2; 21-24
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Water-Glass Content on Electrical Properties of Silica Sand-Based Moulding Sand
    Autorzy:
    Opyd, B.
    Nowak, D.
    Granat, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/380420.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    innovative foundry technology
    microwaves
    moulding sand
    water glass
    electrical properties
    innowacyjna technologia odlewnicza
    mikrofale
    masa formierska
    szkło wodne
    właściwości elektryczne
    Opis:
    In the paper, presented are measurements of permittivity εr and loss factor tgδ of moulding sand depending on bonding material content, taken at 2.45 GHz by perturbation method on a stand of wave-guide resonance cavity. The determined electrical properties are crucial for kinetics of microwave heating of sandmixes containing water-glass as a binder. The measurements were taken for two sandmixes with various sand grains. The results indicate that, for a moulding sands containing water-glass, the relationship between loss factor value and binder concentration is linear. All the examined moulding sands, irrespective of their base, show a relatively high susceptibility to action of microwave field of frequency 2.45 GHz. The presented measurements make a ground for developing a mathematical model of microwave heating of the systems moulding sand-foundry tooling.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 3 spec.; 59-62
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influence of Sand Grains Properties on Electrical Properties of Moulding Sand with Inorganic Binder
    Autorzy:
    Opyd, B.
    Granat, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/381698.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    innovative foundry technology
    innovative foundry material
    microwaves
    moulding sand
    sand grain
    water glass
    innowacyjna technologia odlewnicza
    innowacyjny materiał odlewniczy
    mikrofale
    masa formierska
    osnowa piaskowa
    szkło wodne
    Opis:
    The paper presents the results of basic research on the influence of the properties of sand grains on electrical properties of water glass moulding sands. It shows electrical properties of the main component – sand grains, crucial to the kinetics of moulding sands heating, such as permittivity εr and loss factor tgδ. Measurements were carried out with the use of the perturbation method for silica, chromite and olivine sands of different mineral, chemical composition and particle size distribution, as well as for moulding sands with water glass grade 145. Analysis of the results of measurements of electrical properties shows that all moulding sands are characterized by a similar permittivity εr and loss factor tgδ. It was found that the electrical properties and the quantity and quality of other components may have a decisive influence on the effectiveness and efficiency of the microwave heating of moulding sands with sand grains. In determining the ability to efficiently absorb the microwave radiation for mixtures which moulding sands are, the impact of all components influencing their individual technological parameters should be taken into account.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 3; 43-46
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Impact of Microwave Penetration Depth on the Process of Heating the Moulding Sand with Sodium Silicate
    Autorzy:
    Nowak, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/380638.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    innovative foundry material
    innovative foundry technology
    penetration depth
    microwaves
    electrical permittivity
    moulding sand
    innowacyjny materiał odlewniczy
    innowacyjna technologia odlewnicza
    głębokość wnikania
    mikrofale
    przenikalność elektryczna
    masa formierska
    Opis:
    This paper presents the impact of microwave penetration depth on the process of heating the moulding sand with sodium silicate. For each material it is affected by: the wavelength in vacuum and the real and imaginary components of the relative complex electrical permittivity εr for a selected measurement frequency. Since the components are not constant values and they change depending on the electrical parameters of materials and the frequency of the electromagnetic wave, it is indispensable to carry out laboratory measurements to determine them. Moreover, the electrical parameters of materials are also affected by: temperature, packing degree, humidity and conductivity. The measurements of the dielectric properties of moulding sand with sodium silicate was carried out using the perturbation method on a stand of waveguide resonance cavity. The real and imaginary components of the relative complex electrical permittivity was determined for moulding sand at various contents of sodium silicate and at various packing degrees of the samples. On the basis of the results the microwave penetration depth of moulding sand with sodium silicate was established. Relative literature contains no such data that would be essential to predicting an effective process of microwave heating of moulding sand with sodium silicate. Both the packing degree and the amount of sodium silicate in moulding sand turned out to affect the penetration depth, which directly translates into microwave power density distribution in the process of microwave heating of moulding sand with sodium silicate.
    Źródło:
    Archives of Foundry Engineering; 2017, 17, 4; 115-118
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Możliwości określenia zawartości lepiszcza w masach formierskich przy użyciu pola elektromagnetycznego
    Possibilities of Determination of the Binder Content in Sand Molds with the use of Electromagnetic Field
    Autorzy:
    Nowak, D.
    Granat, K.
    Opyd, B.
    Więcławek, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/382776.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    technologia innowacyjna
    technologia odlewnicza
    masa formierska
    lepiszcze
    mikrofale
    innovative technology
    foundry technology
    moulding sand
    binder
    microwave
    Opis:
    W pracy zaprezentowano wyniki wstępnych badań nad możliwością określenia zawartości lepiszcza w klasycznych masach formierskich metodą mikrofalową. Przedstawione w pracy pomiary przeprowadzono z wykorzystaniem specjalnego stanowiska tzw. linii szczelinowej. Zawartość lepiszcza w masie formierskiej określano na podstawie badań mocy absorbowanej oraz mocy wyjściowej fali elektromagnetycznej. Jedną z głównych zalet proponowanej, nowej metody pomiaru zawartości lepiszcza jest krótki czas pomiaru.
    This paper presents the results of a preliminary study of the possibility to determining binder content in conventional moulding sands using microwave method. Measurements presented in this paper were carried out using a special work station - microwave slot line. Binder content in the moulding sands was defined by analyzing power absorbed and output power of an electromagnetic wave. One of the main advantage of the suggested, new method of binder content measurement is a short measuring time.
    Źródło:
    Archives of Foundry Engineering; 2013, 13, 1 spec.; 121-124
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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