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Wyszukujesz frazę "moulding sand destruction" wg kryterium: Temat

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    Tytuł:
    State of Spent Molding Sands in the Mold Large-Size Cast
    Autorzy:
    Łucarz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/380064.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    spent moulding sand
    organic binder
    thermal destruction
    ignition loss
    mechanical reclamation
    thermal reclamation
    masa formierska
    spoiwo organiczne
    deformacja cieplna
    strata prażenia
    regeneracja mechaniczna
    regeneracja termiczna
    Opis:
    The results of investigations of spent moulding sands taken from the mould at various distances from the surface of the produced casting, are presented in the paper. The casting mould was made with an application of the cooling system of the metal core in order to increase the cooling rate of the ladle casting. As temperature measurements in the mould indicated the heat flow from the metal did not create conditions for the complete burning of a moulding sand. The analysis was performed to find out changes of spent moulding sands caused by degradation and destruction processes of organic binders. Conditions occurring in the casting mould were discussed on the bases of testing: ignition losses, dusts contents, pH reactions and the surface morphology of the moulding sand samples. Factors limiting the effective mould degassing were pointed out. Operations, possible for realisation, which can limit the reasons of a periodical occurrence of increased amounts of casting defects due to changing gas evolution rates being the result of the technological process, were also indicated.
    Źródło:
    Archives of Foundry Engineering; 2016, 16, 4; 69-74
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Method of Selecting the Reclamation Temperature of Spent Moulding Sands with Organic Binders
    Autorzy:
    Łucarz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/381377.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    spent moulding sand
    thermal analysis
    organic binders
    thermal destruction
    thermal reclamation
    used molding sands
    zużyte masy formierskie
    analiza termiczna
    spoiwo organiczne
    zniszczenie termiczne
    regeneracja termiczna
    Opis:
    The thermal reclamation process as a utilisation method of spent moulding and core sands is more costly than other reclamation methods, but in the majority of cases it simultaneously provides the best cleaning of mineral matrices from organic binders. Thus, the application of the thermal analysis methods (TG-DSC), by determining the temperature range within which a degradation followed by a destruction of bounded organic binders in moulding sands, can contribute to the optimisation of the thermal reclamation process and to the limiting its realisation costs. The thermal analysis results of furan resin, one of the most often applied binder in foundry practice, are presented in the hereby paper. The influence of the heating rate of the sample - placed in the thermal analyser - on its degradation and destruction process under oxygen-free (argon) and oxygen (air) conditions, were compared. The recorded TG and DSC curves were used for analysing these processes as the temperature as well as the time function. The obtained results were analysed with regard to determining the required temperature of the thermal reclamation of the investigated organic binder. The usefulness of the developed methodology was found out, however under conditions of meeting several essential requirements concerning the repeatability of performed analyses.
    Źródło:
    Archives of Foundry Engineering; 2018, 18, 1; 65-70
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Conditions of Thermal Reclamation Process Realization on a Sample of Spent Moulding Sand from an Aluminum Alloy Foundry Plant
    Autorzy:
    Łucarz, M.
    Dereń, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/382337.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    spent moulding sand
    organic binders
    thermal destruction
    ignition loss
    mechanical reclamation
    thermal reclamation
    zużyte masy formierskie
    spoiwa organiczne
    zniszczenie termiczne
    straty prażenia
    regeneracja mechaniczna
    regeneracja termiczna
    Opis:
    The results of investigations of thermal reclamation of spent moulding sands originating from an aluminum alloy foundry plant are presented in this paper. Spent sands were crushed by using two methods. Mechanical fragmentation of spent sand chunks was realized in the vibratory reclaimer REGMAS. The crushing process in the mechanical device was performed either with or without additional crushing-grinding elements. The reclaimed material obtained in this way was subjected to thermal reclamations at two different temperatures. It was found that a significant binder gathering on grain surfaces favors its spontaneous burning, even in the case when a temperature lower than required for the efficient thermal reclamation of furan binders is applied in the thermal reclaimer. The burning process, initiated by gas burners in the reclaimer chamber, generates favorable conditions for self-burning (at a determined amount of organic binders on grain surfaces). This process is spontaneously sustained and decreases the demand for gas. However, due to the significant amount of binder, this process is longer than in the case of reclaiming moulding sand prepared with fresh components.
    Źródło:
    Archives of Foundry Engineering; 2017, 17, 2; 197-201
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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