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    Wyświetlanie 1-6 z 6
    Tytuł:
    Zastosowanie nowatorskiej metody pomiaru aktywności tlenu w kontroli procesu wytwarzania żeliwa sferoidalnego
    A novel method for the oxygen activity measurment applied in control of the ductile iron manufacturing process
    Autorzy:
    Kuder, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/391494.pdf
    Data publikacji:
    2012
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Odlewnictwa
    Tematy:
    żeliwo
    grafit
    tlen
    aktywność
    Celox®-Foundry
    cast iron
    graphite
    oxygen
    activity
    Opis:
    Celem pracy była ocena metody pomiaru aktywności tlenu w ciekłym żeliwie dla prognozowania właściwości żeliwa po zakrzepnięciu. Przeprowadzono szereg wytopów doświadczalnych, wykonując pomiary aktywności tlenu po roztopieniu wsadu, obróbce stopami magnezu w zróżnicowanej ilości oraz podczas długotrwałego przetrzymywania stopu w tyglu pieca. Określono podstawowy skład chemiczny żeliwa, postać grafitu, a w wybranych przypadkach całkowitą zawartość gazów (O, N, H) oraz wytrzymałość i wydłużenie. Stwierdzono wpływ aktywności tlenu na morfologię grafitu i po spełnieniu określonych warunków techniczno-organizacyjnych, użyteczność tej metody do kontroli i sterowania procesem wytwarzania żeliwa sferoidalnego.
    The objective of the present study was to evaluate a method for the measurement of oxygen activity in liquid cast iron to predict the cast iron properties after solidification. A series of experimental melts were made, testing the activity of oxygen after melting down of the charge, treatment with varying amounts of magnesium alloys, and during prolonged holding of the melt in a crucible furnace. The basic chemical composition of cast iron, the graphite form, and in some cases, the total gas content (O, N, H) as well as the strength and elongation were determined. The influence of oxygen activity on the morphology of graphite was stated and, provided certain technical and organisational conditions are met, the usefulness of this method in control of the ductile iron manufacturing process was confirmed.
    Źródło:
    Prace Instytutu Odlewnictwa; 2012, 52, 3; 31-44
    1899-2439
    Pojawia się w:
    Prace Instytutu Odlewnictwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Examination of Electrical Resistance of Carburizers Used for Cast Iron Production
    Autorzy:
    Książek, D.
    Koza, M.
    Bieroński, M.
    Krasa, O.
    Kuś, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/381730.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    cast iron
    foundry material
    carburizer
    electrical resistance
    żeliwo
    materiał odlewniczy
    nawęglacz
    opór elektryczny
    Opis:
    The publication presents the results of examination of selected carburizers used for cast iron production with respect to their electric resistance. Both the synthetic graphite carburizers and petroleum coke (petcoke) carburizers of various chemical composition were compared. The relationships between electrical resistance of tested carburizers and their quality were found. The graphite carburizers exhibited much better conductivity than the petcoke ones. Resistance characteristics were different for the different types of carburizers. The measurements were performed according to the authors’ own method based on recording the electric current flow through the compressed samples. The samples of the specified diameter were put under pressure of the gradually increased value (10, 20, 50, 60, and finally 70 bar), each time the corresponding value of electric resistance being measured with a gauge of high accuracy, equal to 0.1μΩ. The higher pressure values resulted in the lower values of resistance. The relation between both the thermal conductance and the electrical conductance (or the resistance) is well known and mentioned in the professional literature. The results were analysed and presented both in tabular and, additionally, in graphic form.
    Źródło:
    Archives of Foundry Engineering; 2016, 16, 4; 65-68
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Computer Simulation of Cast Iron Flow in Castability Trials
    Autorzy:
    Popielarski, P.
    Hajkowski, J.
    Sika, R.
    Ignaszak, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/355454.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    application of information technology to the foundry industry
    castings defects
    cast iron
    castability trial
    Opis:
    The paper includes validation studies of the flow module of the NovaFlow&Solid simulation code. Experiments of ductile iron and gray iron casting in a spiral test of castability were carried out. Casting experiments were then carried out in industrial conditions in the Ferrex Foundry in Poznań and the results are the castability spiral length and local cast iron rate during mould cavity pouring. Simulation tests using NovaFlow&Solid Control Volume code were made. The technological castability test was used to determine thermal-physical data through simplified inversion problem. Influence of physical parameters in the database of simulation code on the spiral length obtained as the result of simulation was analyzed. It was found that critical fraction of capillary flow CLF down has the biggest impact on cast iron castability in the simulation code. The simulations resulted in defining parameters of gray iron GJL 250 and ductile iron GJS-400-15. For the parameters set, the length of castability spiral in simulations was in accordance with casting experiments.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 4; 1433-1439
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structure of Foundry Production in the World and in Poland over the 1974-2013 Period
    Autorzy:
    Soiński, M. S.
    Skurka, K.
    Jakubus, A.
    Kordas, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/381277.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    foundry production
    cast iron
    cast steel
    aluminium alloy
    nonferrous alloy
    produkcja odlewnicza
    żeliwo
    staliwo
    stop aluminium
    stop nieżelazny
    Opis:
    The paper presents data illustrating the total production of castings in the world and in Poland over the 1974-2013 period. The fractions of basic casting alloys in the total amount of material used for the production of metal castings during the considered period of time were found. It was noticed that the fraction of grey cast iron castings in the total amount of the produced castings decreased significantly over the past 40 years, both on a global scale (from about 65-75% to about 45%) and in Poland (from about 75-80% to about 45-55%). The fraction of SG iron increased considerably, up to about 25% in the world, and up to about 12-16% in Poland. The fraction of malleable became almost negligible (about 1%). The fraction of cast steel took different course in Poland and in the world: it stabilised on a global scale at about 10% in recent years, but dropped down to the level of about 4-7% in Poland. The use of aluminium alloys for the production of casting grew dynamically; their fraction in the total production of casting rose from somewhat less than 4% to almost 15% on a global scale. As far as Poland is considered, this growth was ever more intensive: from about 6-8% to about 25-30% in the 1989-2013 period (the detailed data for the previous period of time are lacking).
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 2 spec.; 69-76
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Continuous modification of cast iron by the FLOTRET method
    Autorzy:
    Hanus, A.
    Hanusová, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/380281.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    innowacyjne technologie odlewnicze
    innowacyjne materiały odlewnicze
    rozwój produktu
    żeliwo sferoidalne
    metoda FLOTRET
    innovative foundry technologies
    innovative foundry materials
    product development
    cast iron
    spheroidal graphite
    modification of graphite shape
    FLOTRET method
    Opis:
    Increasing demands on the utility properties of materials used for castings have led to the production of cast iron with a modified shape of graphite, where the required properties are achieved by a change in graphite shape, its size and layout, and a change in the basic structure of the metal. This paper is focused on the continuous method of producing spheroidal graphite FLOTRET. In the introductory section is summarized the theoretical foundations of the secondary treatment of cast irons, especially the FLOTRET flow method, describes the advantages and disadvantages of the method. The practical part is divided into laboratory and operational tests. Laboratory experiments were conducted on a laboratory-type modifier FLOTRET chamber, which was designed and hydraulically optimized. Experiments were focused on the effects of pressure altitude and amount of modifier on the residual values of magnesium, as conditions for a successful modification. The method was tested in two foundries under operating conditions and in one of them was observed a long-term modification process.
    Źródło:
    Archives of Foundry Engineering; 2012, 12, 3; 43-48
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Trends in the Production of Castings in the World and in Poland in the XXI Century
    Autorzy:
    Soiński, M. S.
    Kordas, P.
    Skurka, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/381362.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    foundry production
    cast iron
    cast steel
    aluminium alloys
    non-ferrous alloys
    produkty odlewnicze
    żeliwo
    staliwo
    stopy aluminium
    stopy metali nieżelaznych
    Opis:
    The paper presents data concerning the total production of castings over the 2000-2014 period, both on a global scale, and in Poland. The basic types of casting alloys were taken into account. Changes in the production volume and structure over the period of the analysed 15 years were pointed out with respect to countries leading in foundry production. The topmost position in the world foundry industry is held by China for several years (with almost 45% share in the foundry market), the second place is taken by India (with almost 9% share). A distinct reduction in the shares of the once significant producers of castings, such as USA, Japan, Germany, Russia, Italy, or France, was observed over the 2000-2014 period. Poland had a share of 1.16% in 2000, and of 1.02% in 2014. Comparing the detailed data concerning the years 2000 and 2014, one can see that the fractions of castings made of ductile iron, cast steel, aluminium alloys, or magnesium alloys increase on a global scale, while such alloys as grey cast iron or malleable are in decline.
    Źródło:
    Archives of Foundry Engineering; 2016, 16, 2; 5-10
    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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