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    Wyświetlanie 1-8 z 8
    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
    Tytuł:
    Possibility of utilizing thermosetting moulding sands by microwave heating
    Autorzy:
    Granat, K.
    Nowak, D.
    Stachowicz, M.
    Pigiel, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/380427.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    innovative foundry technology
    microwave heating
    thermosetting moulding sand
    innowacyjna technologia odlewnicza
    nagrzewanie mikrofalowe
    masa formierska termoutwardzalna
    Opis:
    The paper presents a semi-industrial reactor designed for utilisation of waste moulds and cores made of thermosetting moulding sands by microwave incinerating. It was found that a possibility exists of effective incinerating residues of this kind waste cores or moulds left after casting. The research evidences that the apparatus permits effective control of the applied microwave heating process. Preliminary tests of microwave heating indicated that incinerating waste moulds and cores made of industrially used moulding sands based on phenolic-formaldehyde resins is an effective method of their utilization. Application of microwave heating for incinerating waste moulds and cores containing synthetic resins as binders guarantees significant and measurable economical benefits resulting from reduced process time.
    Źródło:
    Archives of Foundry Engineering; 2011, 11, 3 spec.; 71-74
    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:
    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:
    Effect of Microwave Heating on Moulding Sand Properties with Gypsum Binder
    Autorzy:
    Paduchowicz, P.
    Stachowicz, M.
    Granat, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/382976.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    foundry industry
    foundry materials
    foundry technology
    microwave heating
    gypsum
    binding material
    przemysł odlewniczy
    materiały odlewnicze
    technologia odlewnicza
    ogrzewanie mikrofalowe
    gips
    materiał wiążący
    Opis:
    The paper presents results of initial research on the possibility of applying microwave radiation in an innovative process of making casting moulds from silica sand, where gypsum CaSO4∙2H2O was acting as a binding material. In the research were compared strengths and technological properties of moulding mixture subjected to: natural bonding process at ambient temperature or natural curing with additional microwave drying or heating with the use of microwaves immediately after samples were formed. Used in the research moulding sands, in which dry constituents i.e. sand matrix and gypsum were mixed in the ratio: 89/11. On the basis of the results of strength tests which were obtained by various curing methods, beneficial effect of using microwaves at 2.45 GHz for drying up was observed after 1, 2 and 5 hours since moisture sandmix was formed. Applying the microwaves for hardening just after forming the samples guarantees satisfactory results in the obtained mechanical parameters. In addition, it has been noted that, from a technological and economic point of view, drying the silica sand with gypsum binder in microwave field can be an alternative to traditional molding sand technologies.
    Źródło:
    Archives of Foundry Engineering; 2017, 17, 3; 97-102
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of the Possibilities of Sodium Silicate Sands Application in Automated Hot-Box Process of Cores Shooting
    Autorzy:
    Stachowicz, M.
    Granat, K.
    Obuchowski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/382506.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    foundry technology
    sodium silicate
    core box
    core shooting
    bending strength
    technologia odlewnicza
    krzemian sodu
    rdzennica
    rdzeń wstrzeliwany
    wytrzymałość na zginanie
    Opis:
    The paper presents the results of preliminary research on the use of silica sands with hydrated sodium silicate 1.5% wt. of binder for the performance of eco-friendly casting cores in hot-box technology. To evaluate the feasibility of high quality casting cores performed by the use of this method, the tests were made with the use of a semiautomatic core shooter using the following operating parameters: initial shooting pressure of 6 bar, shot time 4 s and 2 s, core-box temperature 200, 250 and 300 °C and core heating time 30, 60, 90 and 150 s. Matrixes of the moulding sands were two types of high-silica sand: fine and medium. Moulding sand binder was a commercial, unmodified hydrated sodium silicate having a molar module SiO2/Na2O of 2.5. In one shot of a core-shooter were made three longitudinal samples (cores) with a total volume of about 2.8 dm3. The samples thus obtained were subjected to an assessment of the effect of shooting parameters, i.e. shooting time, temperature and heating time, using the criteria: core-box fill rate, bending strength (RgU), apparent density and surface quality after hardening. The results of the trials on the use of sodium silicate moluding sands made it possible to further refine the conditions of next research into the improvement of inorganic warm-box/hot-box technology aimed at: reduction of heating temperature and shot time. It was found that the performance of the cores depends on the efficiency of the venting system, shooting time, filling level of a shooting chamber and grains of the silica matrix used.
    Źródło:
    Archives of Foundry Engineering; 2017, 17, 4; 155-160
    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
      Wyświetlanie 1-8 z 8

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