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Wyszukujesz frazę "Vasková, I." wg kryterium: Autor

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    Wyświetlanie 1-8 z 8
    Tytuł:
    Ecological Binding Material of First Generation
    Autorzy:
    Vasková, I.
    Hrubovčáková, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/379910.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    bentonite
    moulding mixture
    nitrification
    quality bentonite
    ecological aspect
    bentonit
    jakość
    aspekt ekologiczny
    Opis:
    Bentonite is clay rock, which is created by decomposition of vulcanic glass. It is formed from mixture of clay minerals of smectite group, mainly montmorillonite, beidellite and nontronite. Its typical characteristics is, that when in contact with water, it intensively swells. First who used this term was W.C. Knight in 1887. The rock had been named after town Fort Benton in American state Montana. For its interesting technological properties and whiteness has wide technological use. Bentonite is selectively mined and according to its final use separately modified, which results in high quality product with specific parameters. In the beginning of 21st century belong bentonite moulding mixtures in foundry to always perspective. Mainly increased ratio of ductile cast iron castings production cannot be ensured without the need of quality bentonite. Great area of scope remains to further research of moulding materials, which return also to bentonite producers.
    Źródło:
    Archives of Foundry Engineering; 2014, 14, 2; 123-128
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of additives in core-forming mixture
    Autorzy:
    Vasková, I.
    Hrubovčáková, M.
    Conev, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/355240.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    innovative foundry technologies and materials
    castings defects
    additives
    Opis:
    In recent years, ingredients, also known as additives, which appreciably affect the quality of the casting surface, come to the fore. Additives - lower the temperature at which SiO2 (major component of silica sand) begins to soften and create a melt on the surface of the grains, increase the reactivity and decrease the temperature of a transition to tridimite and cristobalit. These passages support the increase of volume of subsurface sand stress and the tension for the formation of burrs and other casting defects on the surface of the core or the mold. Nowadays, as a great emphasis is put on the quality of the casts, it is therefore necessary to pay attention to these additives, which can effectively reduce the labor intensity in the production of castings and ensure a quality surface of castings.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 1; 335-338
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The dependence of castings quality produced in clay moulding mixtures from the properties of binder based on a montmorillonite
    Autorzy:
    Vasková, I.
    Fecko, D.
    Malik, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/380359.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    jakość odlewu
    masa formierska
    bentonit
    montmorillonit
    casting quality
    clay moulding mixture
    bentonite
    montmorillonite
    Opis:
    Casting quality depends on many factors including the quality of the input materials, technology, material securing and last but not least, the mould into which the casting is casted. By pouring into a single-shot mould, based mainly on 1st generation binders, is is a very important factor. Basically, a bentonite mixture represents either a three- or four-component system, but each component of the system is a heterogeneous substance. This heterogeneity punctuates mainly a non-stationary heat field, presented throughout the whole process of the casting production. The most important component is a binder and in the case of first generation binders mostly bentonites are used - clays that contain minimum of 80% of montmorillonite.
    Źródło:
    Archives of Foundry Engineering; 2012, 12, 3; 123-128
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Homogenity of die casting and returning material
    Autorzy:
    Malik, J.
    Vasková, I.
    Fecko, D.
    Futáš, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/382774.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    krystalizacja
    innowacyjne technologie odlewnicze
    innowacyjne materiały odlewnicze
    odlewanie ciśnieniowe
    maszyna ciśnieniowa
    theory of crystallization
    innovative foundry technologies
    innovative foundry material
    die casting
    die casting machine
    returning material
    Opis:
    Homogeneity of die castings is influenced by wide range of technological parameters as piston velocity in filling chamber of die casting machine, filling time of mould cavity, temperature of cast alloy, temperature of the mould, temperature of filling chamber, surface pressure on alloy during mould filling, final pressure and others. Based on stated parameters it is clear, that main parameters of die casting are filling time of die mould cavity and velocity of the melt in the ingates. Filling time must ensure the complete filling of the mould cavity before solidification process can negatively influence it. Among technological parameters also belong the returning material, which ratio in charge must be constrained according to requirement on final homogeneity of die castings. With the ratio of returning material influenced are the mechanical properties of castings, innerhomogeneity and chemical composition.
    Źródło:
    Archives of Foundry Engineering; 2012, 12, 2; 61-64
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Usage of connor inlets to eliminate shrinkage
    Autorzy:
    Fecko, D.
    Vasková, I.
    Eperješi, L'.
    Závodný, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/380256.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    żeliwo szare
    eliminacja skurczu
    oprogramowanie symulacyjne
    grey cast iron
    connor inlet
    shrinkage elimination
    simulation software
    Opis:
    The demand for castings of high quality and sound work is nowadays very high. The production of sound castings without foundry errors is the big issue in modern foundries. Foundry simulation software can do a lot to help improve the disposition of castings, gating system and feeder system, and assure good filling and solidification conditions, and also produce sound casting without the need of the old method of 'try and error'. One can easily change a lot of parameters for filling and solidification, and create the best proposal for production. Connor inlets have two functions. One is that it serves as an ingate, through which molten metal passes and comes into the mould cavity. The second function is that it serves as a feeder and substitutes the metal contracted during solidification and cooling of the castings. It can also save quite a lot of metal in comparison to classic feeders.
    Źródło:
    Archives of Foundry Engineering; 2012, 12, 3; 25-28
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Decoring Behaviour of Chosen Moulding Materials with Alkali Silicate Based Inorganic Binders
    Autorzy:
    Conev, M.
    Vasková, I.
    Hrubovčáková, M.
    Hajdúch, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/356323.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    inorganic binder
    alkali silicates
    moulding material
    knock-out properties
    Opis:
    This paper contains basic information about new processes for cores for cylinder heads production with alkali silicate based inorganic binders. Inorganic binders are coming back to the foreground due to their ecologically friendly nature and new technologies for cores production and new binder systems were developed. Basically these binder systems are modified alkali silicates and therefore they carry some well-known unfavourable properties with their usage. To compensate these disadvantages, the binder systems are working with additives which are most often in powder form and are added in the moulding material. This paper deals with decoring behaviour of different moulding sands as well as the influence of chosen additives on knock-out properties in laboratory terms. For this purpose, specific methods of specimen production are described. Developed methods are then used to compare decoring behaviour of chosen sands and binder systems.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 2A; 703-706
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Technological Parameters of Furane Mixtures on Shrinkage Creation in Ductile Cast Iron Castings
    Wpływ właściwości masy furanowej na wielkość skurczu odlewów z żeliwa sferoidalnego
    Autorzy:
    Vasková, I.
    Hrubovčáková, M.
    Eperješi, Š.
    Malik, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/353408.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    graphitization
    shrinkage
    metallurgical quality
    furan molding sand
    grafityzacja
    skurcz odlewniczy
    jakość metalurgiczna
    furanowe masy formierskie
    Opis:
    Ductile cast iron (GS) has noticed great development in last decades and its boom has no analogue in history humankind. Ductile iron has broaden the use of castings from cast iron into areas, which where exclusively domains for steel castings. Mainly by castings, which weight is very high, is the propensity to shrinkage creation even higher. Shrinkage creation influences mainly material, construction of casting, gating system and mould. Therefore, the main realized experiment was to ascertain the influence of technological parameters of furane mixture on shrinkage creation in castings from ductile iron. Together was poured 12 testing items in 3 moulds forto determine and compare the impact of various technological parameters forms the propensity for shrinkage in the casting of LGG.
    W ostatnich latach obserwuje sie intensywny wzrost produkcji odlewów z żeliwa sferoidalnego. Dotyczy to także zastępowania tym tworzywem odlewów staliwnych. W przypadku masywnych odlewów szczególnie duże znaczenie odgrywa przebieg skurczu tworzywa. Powstawanie skurczu wiąże się z materiałem odlewu, jego konstrukcja, układem wlewowym oraz materiałem formy. Celem badan zaprezentowanych w artykule jest ocena wpływu właściwości technologicznych formy na podstawie skurczu. Odlano 12 kształtek w 3 formach, aby ocenić wpływ jakości formy na skurcz odlewów z żeliwa sferoidalnego.
    Źródło:
    Archives of Metallurgy and Materials; 2014, 59, 3; 1037-1040
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Increasing of Utility Properties of Grey Cast Iron Castings with Heat Treatment
    Autorzy:
    Eperješi, Š.
    Malik, J.
    Vasková, I.
    Fecko, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/380865.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    grey cast iron
    heat treatment
    hardening capacity
    austenite
    martensite
    żeliwo szare
    obróbka cieplna
    austenit
    martenzyt
    Opis:
    Grey cast iron belongs to materials for casting production, which have wide application for different industry branches. Wide spectrum of properties of these materials is given by the structure of base metal matrix, which can be influenced with heat treatment. Processes of annealing can be applied for grey cast iron without problems. During heat treatment processes, where higher cooling rates are used, the thermal and structural strains become important. Usage and conditions of such heat treatment for grey cast iron castings of common production are the subject of evaluation of this article.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 2; 13-16
    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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