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    Wyświetlanie 1-6 z 6
    Tytuł:
    Manufacturing of Cast Metal Foams with Irregular Cell Structure
    Autorzy:
    Kroupová, I.
    Radkovský, F.
    Lichý, P.
    Bednářová, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/382675.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    metallic foam
    precursor
    casting
    irregular structure
    cell structure
    piana metalowa
    prekursor
    odlewanie
    struktura nieregularna
    struktura komórkowa
    Opis:
    Metallic foams are materials of which the research is still on-going, with the broad applicability in many different areas (e.g. automotive industry, building industry, medicine, etc.). These metallic materials have specific properties, such as large rigidity at low density, high thermal conductivity, capability to absorb energy, etc. The work is focused on the preparation of these materials using conventional casting technology (infiltration method), which ensures rapid and economically feasible method for production of shaped components. In the experimental part we studied conditions of casting of metallic foams with open pores and irregular cell structure made of ferrous and nonferrous alloys by use of various types of filler material (precursors).
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 2; 55-58
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Preparation and Evaluation of Properties of Cast Metallic Foams with Regular Inner Structure
    Autorzy:
    Lichý, P.
    Elbel, T.
    Kroupová, I.
    Radkovský, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/353931.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    metallic foams
    casting
    microstructure
    mechanical properties
    Opis:
    Lately we encounter still more new applications of metallic foams, as well as possible methods of their manufacture. These metallic materials have specific properties, such as large rigidity at low density, in some cases high thermal conductivity, capability to absorb energy, etc. The work is focused on the preparation of these materials using conventional casting technology, which ensures rapid and economically feasible method for production of shaped components. In the experimental part we studied conditions of casting of metallic foams with a regular structure made of ferrous and non-ferrous alloys. For thus obtained castings we evaluated the achieved microstructure and mechanical properties, which determine the possible use of these materials. The samples were subjected to compression tests, by which we investigated deformation behaviour of selected materials and determined the value of energy absorption.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 3; 1643-1646
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Proposal of Method of Removal of Mould Material from the Fine Structure of Metallic Foams used as Filters
    Metoda usuwania materiału formierskiego z delikatnej struktury piany metalowej stosowanej jako filtr
    Autorzy:
    Kroupová, I.
    Bednářová, V.
    Elbel, T.
    Radkovský, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/353533.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    metallic foam
    aluminum foam
    manufacturing of metal foam
    cast metal filter
    piana metalowa
    piana aluminiowa
    produkcja pian metalicznych
    filtr z piany metalowej
    Opis:
    Metallic foams are materials that are subject of an ongoing research with the broad applicability in many different areas (e.g. automotive industry, building industry, medicine, etc.). These metal materials contain in their structure artificially created pores. These pores give them specific properties, such as: large rigidity at low density, high thermal conductivity, capability to absorb energy, etc. Since the discovery of porous metallic materials numerous methods of production have been developed. The aim of the paper is to introduce effective casting methods of manufacturing of metallic foams, namely cast metal filters from the aluminum alloy. Research deals with investment casting with use of pattern made of polymeric foam, which is used for production of metallic foam with open pores. The main disadvantage of this procedure consists in removing the mould material without damaging the fine structure of the cast filter. Plaster is used as the mould material and the most important result of this paper is the presentation of the effective procedure of plaster removal from the porous structure of cast filters.
    Piany metalowe są przedmiotem wielu badań gdyż znajdują szerokie zastosowanie w wielu dziedzinach np. produkcji samochodów. budownictwie czy w medycynie. W swojej strukturze zawierają sztucznie wytworzone pory, zapewniające uzyskanie specyficznych właściwości jak duża wytrzymałość, niewielka gęstość, wysokie przewodnictwo cieplne zdolność do absorpcji energii itp. Od czasu wynalezienia porowatych materiałów metalowych opracowano wiele metod ich wytwarzania. Celem opracowania jest wprowadzenie efektywnych metod odlewniczych produkcji pian metalowych, szczególnie ze stopów glinu. Studium zajmuje się precyzyjną metodą odlewania przy zastosowaniu modelu wykonanego z piany polimerowej stosowanej w produkcji piany z otwartymi porami. Główna niedogodność metody polega na trudności usuwania materiału formierskiego, bez naruszenia delikatnej struktury odlewanego filtra. Jako materiał formierski stosuje się gips i najważniejszym wynikiem pracy jest przedstawienie efektywnej procedury usuwania gipsu z porowatej struktury odlanego filtra.
    Źródło:
    Archives of Metallurgy and Materials; 2014, 59, 2; 727-730
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of Properties of Cast Metal Foams with Irregular Inner Structure
    Autorzy:
    Kroupová, I.
    Lichý, P.
    Ličev, L.
    Hendrych, J.
    Souček, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/355316.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    metal foams
    irregular structure
    precursor
    porosity
    micro-CT
    Opis:
    Internal structure of metal foams is one of the most important factors that determine its mechanical properties. There exists a number of methods for studying the nature of the inner porous structure. Unfortunately most of these processes is destructive and therefore it is not possible to reuse the sample. From this point of view, as a suitable method seems to be the ability of using the so-called X-ray microtomography (also micro-CT). This is a non-destructive methodology used in a number of fields (industry, science, archaeology, medicine) for a description of the material distribution in the space (e.g. pores, fillers, defects, etc.). In principle, this technology works on different absorption of X-ray radiation by materials with changing proton number. The contribution was worked out in collaboration with experts from the Faculty of Electrical Engineering and Computer Science of the VŠB-Technical University of Ostrava and it is focused on the analysis of internal structure of the metal foam casting with irregular arrangement of internal pores by using micro-CT. The obtained data were evaluated in the commercial software VGStudio MAX 2.2 and in the FOTOMNG system. For the evaluation of these data a new specialized module was introduced in this system. Several methods of pre-processing the image was prepared for the measurement. This preliminary processing consists, for example, from a binary image thresholding for better diversity between the internal porosity and the material itself or functions for colour inversion.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 4; 1847-1851
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Some Possibilities of Using Statistical Methods While Solving Poor Quality Production
    Autorzy:
    Lakomá, R.
    Čamek, L.
    Lichý, P.
    Kroupová, I.
    Radkovský, F.
    Obzina, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1837848.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    production process
    investment casting
    poor quality products
    casting defects
    quality of cast
    statistical hypothesis
    wax patterns
    proces produkcji
    produkty odlewnicze
    wady odlewów
    jakość odlewu
    metody statystyczne
    formy woskowe
    Opis:
    This paper presents an overview of a research on six practical cases that were solved in a precise casting company where parts are cast by the mean of the low-wax casting method (investment casting) in order to decrease poor quality production. The steel cast parts production technology by the lost-wax method requires the detailed work procedures observation. On the base of statistical processing data of given types of casting products, it was possible to assess the significance of each particular checking events by using the statistical hypothesis testing. The attention was focused on wax and ceramic departments. The data in technological flow were compared before and after the implementation of the change and statistical confirmative influences were assessed. The target consisted in setting such control manners in order to get the right conditions for decreasing poor quality parts. It was evidenced that the cast part defect cause correct identification and interpretation is important.
    Źródło:
    Archives of Foundry Engineering; 2021, 21, 1; 18-22
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Some Possibilities of Using Statistical Methods While Solving Poor Quality Production
    Autorzy:
    Lakomá, R.
    Čamek, L.
    Lichý, P.
    Kroupová, I.
    Radkovský, F.
    Obzina, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1837805.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    production process
    investment casting
    poor quality products
    casting defects
    quality of cast
    statistical hypothesis
    wax patterns
    proces produkcji
    produkty odlewnicze
    wady odlewów
    jakość odlewu
    metody statystyczne
    formy woskowe
    Opis:
    This paper presents an overview of a research on six practical cases that were solved in a precise casting company where parts are cast by the mean of the low-wax casting method (investment casting) in order to decrease poor quality production. The steel cast parts production technology by the lost-wax method requires the detailed work procedures observation. On the base of statistical processing data of given types of casting products, it was possible to assess the significance of each particular checking events by using the statistical hypothesis testing. The attention was focused on wax and ceramic departments. The data in technological flow were compared before and after the implementation of the change and statistical confirmative influences were assessed. The target consisted in setting such control manners in order to get the right conditions for decreasing poor quality parts. It was evidenced that the cast part defect cause correct identification and interpretation is important.
    Źródło:
    Archives of Foundry Engineering; 2021, 21, 1; 18-22
    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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