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    Wyświetlanie 1-6 z 6
    Tytuł:
    Bench life (work time) of moulding and core sands with chemical binders – a new, ultrasound investigation method
    Autorzy:
    Zych, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/381341.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    bench life
    ultrasound
    binding sand
    moulding sand
    investigation method
    ultradźwięk
    materiał wiążący
    masa formierska
    metoda badawcza
    Opis:
    The obtained results of the investigations of influences of the selected technological factors on the bench life (work time) of moulding and core sands with chemical binders are presented in the hereby paper. The bench life assessment is performed by the new, author’s method with the application of the ultrasound technique. This method was patented by the author. The influence of such factors as: matrix (surroundings) temperature, matrix water content, ratio of binding components hardener/binder (h/b) and the reclamation – on the bench life of furan moulding sands was determined. The empirical dependencies (regressions) were determined, which allowed forecasting the bench life (BL) of moulding sands as functions: BL = f(W%), BL = f(T) for the fresh and after the reclamation sands, BL = f(h/b). These dependencies should be treated as examples of the new method application for investigating the bench life of moulding sands with chemical binders.
    Źródło:
    Archives of Foundry Engineering; 2013, 13, 4; 117-122
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Assessment of the Harmfulness of Moulding Sands with Alkyd Resin Subjected to the High Temperature Influence
    Autorzy:
    Holtzer, M.
    Dańko, R.
    Żymankowska-Kumon, S.
    Kubecki, M.
    Bobrowski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/354778.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    moulding sand
    binding
    BTEX
    thermal analysis
    GC/MS
    Opis:
    Out of moulding sands used in the foundry industry, sands with organic binders deserve a special attention. These binders are based on synthetic resins, which ensure obtaining the proper technological properties and sound castings, however, they negatively influence the environment. These resins in their initial state these resins are not very dangerous for people and for the environment, thus under an influence of high temperatures they generate very harmful products, being the result of their thermal decomposition. Depending on the kind of the applied resin, under an influence of a temperature such compounds as: furfuryl alcohol, formaldehyde, phenol, BTEX group (benzene, toluene, ethylbenzene, xylene), and also polycyclic aromatic hydrocarbons (PAHs) can be formed and released. The aim of the study was the development of the method, selection of analytical methods and the determination of optimal conditions of formation compounds from the BTEX and PAHs group. Investigations were carried out in the specially designed set up for the thermal decomposition of organic substances in a temperature range: 500 – 1 300°C at the laboratory scale. The object for testing was alkyd resin applied as a binding material for moulding sands. The qualitative and quantitative analyses of compounds were performed by means of the gas chromatography coupled with the mass spectrometry (GC/MS).
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 4; 2171-2176
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of the compounds from the BTEX group, emitted during thermal decomposition of alkyd resin
    Autorzy:
    Kubecki, M.
    Holtzer, M.
    Bobrowski, A.
    Dańko, R.
    Grabowska, B.
    Żymankowska-Kumon, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/380216.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    masa formierska
    wiązanie
    BTEX
    analiza termiczna
    GC-MS
    moulding sand
    binding
    thermal analysis
    Opis:
    Suitability of the given binding agent for the moulding sands preparation depends on the one hand on the estimation of technological properties of the sand and the mould made of it and the obtained casting quality and on the other hand on the assessment of this sand influence on the natural and working environment. Out of moulding sands used in the foundry industry, sands with organic binders deserve a special attention. These binders are based on synthetic resins, which ensure obtaining the proper technological properties and sound castings, however, they negatively influence the environment. If in the initial state these resins are not very dangerous for people and for the environment, thus under an influence of high temperatures they generate very harmful products, being the result of their thermal decomposition. Depending on the kind of the applied resin (phenol-formaldehyde, urea, furfuryl, urea-furfuryl, alkyd) under an influence of a temperature such compounds as: furfuryl alcohol, formaldehyde, phenol, BTEX group (benzene, toluene, ethylbenzene, xylene), and also polycyclic aromatic hydrocarbons (PAH) can be formed and released. The aim of the study was the development of the method, selection of analytical methods and the determination of optimal conditions of formation compounds from the BTEX group. An emission of these components constitutes one of the basic criteria of the harmfulness assessment of binders applied for moulding and core sands. Investigations were carried out in the specially designed set up for the thermal decomposition of organic substances in a temperature range: 5000C - 13000C at the laboratory scale. The object for testing was alkyd resin applied as a binding material for moulding sands. Within investigations the minimal amount of adsorbent necessary for the adsorption of compounds released during the decomposition of the resin sample of a mass app. 15 mg was selected. Also the minimal amount of solvent needed for the desorption of compounds adsorbed in the column with adsorbent was found. The temperature range, in which the maximal amounts of benzene, toluene, ethylobenzene and xylenes are released from the resin, was defined. The qualitative and quantitative analyses of compounds from the BTEX group were performed by means of the gas chromatography combined with the mass spectrometry (GC/MS).
    Źródło:
    Archives of Foundry Engineering; 2012, 12, 3; 69-74
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigations of the Reclamation Ability of Moulding Sands with the Modified Binding System and the Reclaim Quality Assessment
    Autorzy:
    Bobrowski, A.
    Dańko, R.
    Holtzer, M.
    Drożyński, D.
    Skrzyński, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/380847.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    moulding sand
    geopolymer binder
    reclaim
    hardeners
    reclaim quality
    masa formierska
    spoiwo
    odzysk
    utwardzacze
    jakość odzysku
    Opis:
    The investigation results of the reclaiming ability of a spent moulding sand with the geopolymer Geopol developed by the SAND TEAM Company as well as a moulding sand with a modified binding system based on the geopolymer binder and new hardener offered by the KRATOS Company, are presented in the paper. The basic aim of investigations was the comparison of the reclaiming ability of spent moulding sands with additions of hardeners supplied by various producers. All hardeners were of the same hardening rate. Amounts of the geopolymer binder and of the hardener was the same for both tested moulding sands.
    Źródło:
    Archives of Foundry Engineering; 2014, 14, 1 spec.; 31-36
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Studies of Binding Kinetics and Choice of Self-Hardening Moulding and Core Sands Used for Casting Massive Parts for Wind Power Industry under the Conditions of Krakodlew Foundry
    Autorzy:
    Rączka, M.
    Isendorf, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/382470.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    wind energy
    innovative materials
    innovative casting technologies
    environmental protection
    ductile iron
    moulding sand
    energia wiatrowa
    innowacyjne materiały
    innowacyjna technologia odlewania
    ochrona środowiska
    żeliwo
    masy formierskie
    Opis:
    In highly developed countries, a significant progress in the use of alternative and clean energy sources has recently been observed. The European Union has implemented a programme to build wind turbines. It is estimated that in the coming years, thanks to the support in tax and credit, the global energy will develop very intensively. Many components of the wind turbines are castings. The basic material used for these castings is ductile iron, which in this particular case must meet high requirements imposed by the operating conditions of wind turbines. Anticipating an increase in customer demand for this type of castings, Krakodlew SA has decided to modernize its foundry using the ability to obtain external financing. The ductile iron manufacturing technology is now being developed and adapted to the specific conditions of the foundry plant, including the melting process yielding cast material with the required chemical composition, the technology of moulding, and the conditions for possible secondary metallurgy, spheroidizing treatment and graphitizing inoculation. The fulfilment of the imposed conditions for the casting production demands the use of advanced casting technologies introduced to the manufacturing process. The development of technology to launch the production of ductile iron castings for the wind power industry was supported by The National Centre for Research and Development (NCBiR). This article presents part of research on the binding kinetics of furan resin sands and choice of their composition for moulds and cores to make heavy castings used as components of equipment for the wind power industry.
    Źródło:
    Archives of Foundry Engineering; 2017, 17, 2; 222-226
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Method of the moulding sands binding power assessment in two-layer moulds systems
    Metoda oceny wielkości siły wiązania mas w układzie form dwuwarstwowych
    Autorzy:
    Holtzer, M.
    Drożyński, D.
    Bobrowski, A.
    Makselon, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/381632.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    innovative foundry material
    innovative foundry technology
    mechanical properties
    two layer mould
    moulding sand
    alkaline organic binder
    innowacyjny materiał odlewniczy
    innowacyjna technologia odlewnicza
    właściwości mechaniczne
    forma dwuwarstwowa
    masa formierska
    alkaliczne spoiwo organiczne
    Opis:
    More and more foundry plants applying moulding sands with water-glass or its substitutes for obtaining the high-quality casting surface at the smallest costs, consider the possibility of implementing two-layer moulds, in which e.g. the facing sand is a sand with an organic binder (no-bake type) and the backing sand is a sand with inorganic binder. Both kinds of sands must have the same chemical reaction. The most often applied system is the moulding sand on the water-glass or geopolymer bases – as the backing sand and the moulding sand from the group of self-hardening sands with a resol resin – as the facing sand. Investigations were performed for the system: moulding sand with inorganic GEOPOL binder or moulding sand with water glass (as a backing sand) and moulding sand, no-bake type, with a resol resin originated from various producers: Rezolit AM, Estrofen, Avenol NB 700 (as a facing sand). The LUZ apparatus, produced by Multiserw Morek, was adapted for investigations. A special partition with cuts was mounted in the attachment for making test specimens for measuring the tensile strength. This partition allowed a simultaneous compaction of two kinds of moulding sands. After 24 hours of hardening the highest values were obtained for the system: Geopol binder - Avenol resin.
    Coraz więcej odlewni stosujących masy ze szkłem wodnym lub jego zamiennikami (np. spoiwo Rudal, dla uzyskania wysokiej jakości powierzchni odlewów przy możliwie najniższych kosztach, rozważa możliwość wdrożenia tzw. form dwuwarstwowych, w których np. masa przymodelowa jest masą ze spoiwem organicznym typu SMS, a masa wypełniająca masą ze spoiwem nieorganicznym. Oba rodzaje piasków muszą mieć taki sam charakter chemiczny. Najczęściej stosowanym układem jest masa na bazie szkła wodnego lub geopolimeru, jako masa wypełniająca oraz masa z grupy mas samoutwardzalnych z żywica rezolową jako masa przymodelowa. Badania prowadzono dla układu masa ze spoiwem nieorganicznym GEOPOL lub masa ze szkłem wodnym (jako masa wypełniająca) i masa typu SMS z żywicą rezolową pochodzącą od różnych producentów: Rezolit AM, Estrofen, Avenol 700 NB (jako masa przymodelowa). Do badań przystosowano aparat LUZ produkcji Multiserw Morek, w którym w przystawce do sporządzania kształtek z masy do pomiaru wytrzymałości na rozciąganie zamontowano specjalną nacinaną przegrodę, która umożliwiała równoczesne zagęszczenie dwóch rodzajów masy. Po 24 godzinach utwardzania wyraźnie najwyższe wartości uzyskano dla układu spoiwo Geopol - żywica Avenol.
    Źródło:
    Archives of Foundry Engineering; 2013, 13, 2; 39-42
    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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