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    Wyświetlanie 1-5 z 5
    Tytuł:
    Advanced metrology of surface defects measurement for aluminum die casting
    Autorzy:
    Świłło, S. J.
    Myszka, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/381915.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    nondestructive testing
    aluminum die casting
    surface defect
    topography measurement
    scanning method
    badania nieniszczące
    odlewanie ciśnieniowe
    wada powierzchniowa
    pomiar topografii powierzchni
    Opis:
    The scientific objective of the research is to develop a strategy to build computer based vision systems for inspection of surface defects in products, especially discontinuities which appear in castings after machining. In addition to the proposed vision inspection method the authors demonstrates the development of the advanced computer techniques based on the methods of scanning to measure topography of surface defect in offline process control. This method allow to identify a mechanism responsible for the formation of casting defects. Also, the method allow investigating if the, developed vision inspection system for identification of surface defects have been correctly implemented for an online inspection. Finally, in order to make casting samples with gas and shrinkage porosity defects type, the LGT gas meter was used . For this task a special camera for a semi-quantitative assessment of the gas content in aluminum alloy melts, using a Straube-Pfeiffer method was used. The results demonstrate that applied solution is excellent tool in preparing for various aluminum alloys the reference porosity samples, identified next by the computer inspection system.
    Źródło:
    Archives of Foundry Engineering; 2011, 11, 3 spec.; 227-230
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Problem of Assessing the Graphitizing Abilities of Near-eutectic Cast Iron - Basic Cast Iron for Modification
    Autorzy:
    Zych, J.
    Myszka, M.
    Snopkiewicz, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/2079792.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    eutectic cast iron
    graphitizing
    ultrasonic method
    żeliwo eutektyczne
    grafityzacja
    metoda ultradźwiękowa
    Opis:
    Cast iron destined for spheroidization is usually characterized by a near-eutectic chemical composition, which is a result of the necessity of maintaining its high graphitizing ability. This graphitizing ability depends mainly on the chemical composition but also on the so-called physical-chemical state. This, in turn, depends on the melting process history and the charge structure. It happens quite often, that at very similar chemical compositions cast irons are characterized by different graphitizing abilities. The hereby work concerns searching for the best method of assessing the graphitizing abilities of near-eutectic cast iron. The assessment of the graphitizing ability was performed for cast iron obtained from the metal charge consisting of 100% of special pig iron and for synthetic cast iron obtained from the charge containing 50% of pig iron + 50% of steel. This assessment was carried out by a few methods: wedge tests, thermal analysis, microstructure tests as well as by the new ultrasonic method. The last method is the most sensitive and accurate. On the basis of the distribution of the wave velocity, determined in the rod which one end was cast on the metal plate, it is possible to determine the graphitizing ability of cast iron. The more uniform structure in the rod, in which directional solidification was forced and which had graphite precipitates on the whole length, the higher graphitizing ability of cast iron. The homogeneity of the structure is determined by the indirect ultrasonic method, by measurements of the wave velocity. This new ultrasonic method of assessing the graphitizing ability of cast iron of a high Sc (degree of eutectiveness) and CE (carbon equivalent) content, can be counted among fast technological methods, allowing to assess the cast iron quality during the melting process.
    Źródło:
    Archives of Foundry Engineering; 2021, 21, 4; 29-34
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Control of Selected Properties of „Vari-Morph” (VM) Cast Iron by Means of the Graphite form Influence, Described by the Mean Shape Indicator
    Autorzy:
    Zych, J.
    Myszka, M.
    Kaźnica, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/382206.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    VARI-MORPH cast iron
    graphite shape indicator
    heat fatigue
    control of selected properties
    żeliwo VARI-MORPH
    wskaźnik kształtu
    zmęczenie cieplne
    kontrola wybranych właściwości
    Opis:
    The graphite form in cast iron is the structure parameter deciding on its all physical and mechanical properties. Three basic forms of graphite: flake, vermicular (compact) and nodular (spheroidal) are singled out in standard cast iron grades, without a heat treatment. Standards of individual grades of cast iron the most often allow only the homogeneous graphite form, sometimes with addition of 5÷10% of the other form. The interesting and - in the authors opinion - future-oriented material can constitute cast iron in which various forms of graphite are present, e.g. in comparative amounts: spherical and vermicular cast irons. Cast iron within which graphite occurs in two or three forms was named „Vari-Morph” (VM) cast iron, i.e. the one in which spherical and vermicular or vermicular and flake graphite occur in a wide range of proportions. The results of investigations of these new cast iron grades and their properties are presented in the hereby paper.
    Źródło:
    Archives of Foundry Engineering; 2019, 3; 43-48
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Tungsten on the Structure and Properties of Ductile Iron Containing 0.8% Cu
    Autorzy:
    Myszka, Dawid
    Kasińska, J.
    Penkul, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2126899.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    metallography
    mechanical properties
    tungsten
    cast iron
    metalografia
    właściwości mechaniczne
    wolfram
    żeliwo
    Opis:
    The possibilities of producing ductile cast iron with the addition of 1÷3% of tungsten are presented. Tungsten from waste chips from mechanical processing was introduced into the liquid cast iron in the form of specially prepared cartridges. Correct dissolution of tungsten in the metal bath was found, and there were no casting defects in the alloy. The form of carbide precipitates in the microstructure of cast iron was determined and the influence of increasing tungsten content on the reduction of the number of graphite precipitates in the structure was determined. Impact tests show that this property degrades with increasing tungsten content as opposed to hardness which increases. It was found that the addition of tungsten from machining waste is a potential source of enrichment of cast iron with this element.
    Źródło:
    Archives of Foundry Engineering; 2021, 21, 4; 121--126
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of Distortion on the Example of the Rings from Ductile Iron and Cast Steel
    Autorzy:
    Łukasik, K.
    Nawrocki, P.
    Misiak, J.
    Myszka, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/383018.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    heat treatment
    ductile iron
    cast steel
    micrometric measurement
    distortion
    obróbka cieplna
    żeliwo
    staliwo
    pomiar mikrometryczny
    odkształcanie
    Opis:
    The paper attempts to analyze distortions of cast iron and cast steel rings, after heat treatment cycles. The factors influencing distortion are: chemical composition of material, sample geometry, manufacturing process, hardenability, temperature and heat treatment method. Standard distortion tests are performed on C-ring samples. We selected a ring-model, which approximate the actual part, so that findings apply to gear rings. Because distortion depends on so many variables, this study followed strictly defined procedures. The research was started by specifying the appropriate geometry of the samples. Then, the heat treatment was conducted and samples were measured again. The obtained results allow to determine the value of the resulting distortion and their admissibility. The research will be used to evaluate the possibility of using the material to produce parts of equipment operated under extreme load conditions.
    Źródło:
    Archives of Foundry Engineering; 2017, 17, 4; 97-102
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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