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1
Content available Ductile cast iron obtain by lost foam process and inmold method
Kaczorowski R., Just P., Pacyniak T.
Archives of Metallurgy and Materials
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2013
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Vol. 58, iss. 3
823--826
EN
This paper presents a technology of ductile cast iron obtain by lost foam process with use of inmold method. Spheroidization was carried out using master alloy in an amount of 1.5% by mass on casting iron. Research the influence of the gating system configuration and the shape of the reaction chamber, the degree of spheroidization cast iron, which estimated based on the shape of the graphite. Research have shown that the greatest impact on the degree of spheroidization has cast the infusion position relative to the casting inlet and the reaction chamber, and the shape of the reaction chamber.
PL
W pracy przedstawiono technologię otrzymywania odlewów z żeliwa sferoidalnego metodą inmold z wykorzystaniem procesu pełnej formy. Sferoidyzację prowadzono z użyciem zaprawy sferoidyzująco-modyfikującej w ilości 1,5% na masę sferoidyzowanego żeliwa. Przeprowadzono badania wpływu konfiguracji układu wlewowego oraz kształtu komory reakcyjnej na stopień sferoidyzacji żeliwa, który określono na podstawie wskaźnika kształtu grafitu. Badania wykazały, że największy wpływ na stopień sferoidyzacji żeliwa ma położenie wlewu doprowadzającego względem odlewu i komory reakcyjnej, oraz kształt komory reakcyjnej.
2
Content available Optimization of master alloy amount and gating system design for ductile cast iron obtain in lost foam process
Just P., Kaczorowski R., Pacyniak T.
Archives of Foundry Engineering
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2013
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Vol. 13, iss. 3
43--46
EN
The paper presents the optimization of master alloy amount for the high nodular graphite yield (80-90%) in cast iron obtain in lost foam process. The influence of the gating system configuration and the shape of the reaction chamber, the degree of spheroidisation cast iron was examined. Research has shown that the, optimal of master alloy amount of 1.5% by mass on casting iron. The degree of spheroidisation is also influenced by the gating system configuration. The best spheroidisation effect was obtained for liquid cast iron was fed into the reaction chamber from the bottom and discharged from the top.
3
Content available The influence of the shape of the reaction chamber on spheroidisation of cast iron produced in the lost foam casting process with use of the inmold method
Just P., Pacyniak T.
Archives of Foundry Engineering
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2012
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Vol. 12, iss. 2
175-178
EN
The article presents the results of the research on the influence of the shape of reaction chamber on spheroidisation of cast iron produced with use of the inmold method. The amounts of nodular graphite precipitates in castings produced with the use of different reaction chambers have been compared.
4
Content available Vermicular cast iron production in the “Inmold” technology (in the Metalpol casting house) and the assessment of its thermal fatigue resistance
Zych J., Żyrek A.
Archives of Foundry Engineering
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2011
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Vol. 11, iss. 3 spec.
255--260
EN
The method of obtaining the vermicular cast iron in the “Inmold” technology and the results of the thermal fatigue investigations, are presented in the paper. The influence of the maximum cycle temperature (Tmax) on the thermal fatigue resistance was examined by means of the L.F. Coffin method. The cast iron structure change caused by the thermal fatigue is presented in the paper. When the vermicular cast iron is subjected to the thermal fatigue the matrix ferritisation occurs, which leads to the strength, Rm., decrease. The heating process of the vermicular cast iron is slower as compared to the spheroidal cast iron, whereas the cooling process is faster. Under the same conditions of heat exchanging the vermicular cast iron is heated to a much lower temperature than the spheroidal one. Together with the maximum heating temperature increase the thermal fatigue resistance decreases.
5
Content available remote Influence analysis foamed polystyrene model on casting defects as well as microstructure ductile cast iron from Lost Foam process with Inmold method
Just P., Pacyniak T.
Archives of Foundry Engineering
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2011
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Vol. 11, iss. 3
155-158
EN
In this work was shown a influence analysis foamed polystyrene model on casting defects as well as microstructure ductile cast iron from Lost Foam process with Inmold method.
6
Content available remote Influence of reaction chamber shape on cast-iron spheroidization process in-mold
Pietrowski S.
Archives of Foundry Engineering
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2010
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Vol. 10, iss. 1
115-122
EN
This paper presents a results concerning the influence of reaction chamber shape on cast - iron spheroidization process in form. The volume of the tested reaction chambers was about 118000mm3. Reaction chambers in the shape of: rectangular, cylinder and spherical cap were examined. It has been shown that the best graphite spheroidizing process was provided by spherical cap chamber shape. The reaction of cast – iron with magnesium in reaction chamber depends on the flow of cast - iron in the chamber. In rectangular and cylinder shape chambers proceed the impact of diphase stream on flat bottom wall. It causes the creation on its surface film, called: cast – iron "film", where single grains of magnesium master alloy exist. The largest part of master alloy is drifted by liquid cast – iron to the top and only there graphite spheroidization process proceed. In the spherical cap shape reaction chamber, as a result of rotation movement of liquid cast – iron throughout its volume, graphite spheroidization process proceed. Apart from the reaction chamber shape, applying of mixing chamber ensure full cast - iron spheroidization process.
7
Content available remote Ductile cast iron obtaining by Inmold method with use of LOST FOAM process
Pacyniak T., Kaczorowski R.
Archives of Foundry Engineering
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2010
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Vol. 10, iss. 1
101-104
EN
The possibility of manufacturing of ductile cast iron castings by Inmold method with use of LOST FOAM process was presented in this work. The spheroidization was carried out by magnesium master alloy in amounts of 1% casting mass. Nodulizer was located in the reactive chamber in the gating system made of foamed polystyrene. Pretests showed, that there are technical possibilities of manufacturing of casts from ductile cast iron in the LOST FOAM process with use of spheroidization in mould.
8
Content available remote Control of cast iron and casts manufacturing by Inmold method
Pietrowski S.
Archives of Foundry Engineering
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2009
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Vol. 9, iss. 3
133-142
EN
In this paper the usability of cast iron spheroidizing process in mould control by ATD method as well as by ultrasonic method were presented. Structure of instrumentation needed for control form performance of cast iron spheroidizing by Inmold method was illustrated. Author, pointed out that amount of magnesium master alloy should obtain 0,8 - 1,0% of mass in form at all. Such quantity of preliminary alloy assure of obtain of nodular graphite in cast iron. In consequence of this, is reduce the cast iron liquidus temperature and decrease of recalescence temperature of graphite-eutectic crystallization in compare with initial cast iron. Control of casts can be carried out by ultrasonic method. In plain cast iron, ferritic-pearlitic microstructure is obtaining. Additives of 1,5% Cu ensure pearlitic structure.
9
Content available remote Effect of the exothermic mixture composition on the parameters of crystallization of phase alpha and end of crystallization of alloy AK7
Lipiński T.
Technical Sciences / University of Warmia and Mazury in Olsztyn
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2000
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nr 3
139-149
EN
The paper presents changes in: the temperature at the beginning and end of phase alpha crystallization, the temperature at the end of alloy AK7 crystallization and range of the crystallization process. The changes were caused by alloy treatment with exothermic mixtures. The studies were conducted following a factorial design. The mixtures were composed in such a way that one of the components analyzed was at a higher or lower level, while the other ones - at the primary level.
PL
W pracy przedstawiono zmianę temperatury początku i końca krystalizacji fazy alfa, temperatury końca krystalizacji oraz zakresu krystalizacji stopu AK7 w wyniku obróbki stopu mieszankami dającymi efekt egzotermiczny. Badania prowadzono na podstawie planowania czynnikowego. Mieszanki zestawiono tak, aby jeden analizowany ich składnik był na poziomie wyższym i niższym, a pozostałe na poziomie podstawowym.
10
Content available remote Production of ductile cast iron from iron blast furnace pig iron by “in mold” method
Gawroński J., Jura S., Cholewa M.
Krzepnięcie Metali i Stopów
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2000
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R. 2, nr 44
109--112
EN
A trial of ductile cast iron production with the use in 100% blast furnace pig iron has been undertaken. Norwegian pig iron OB and Polish pig iron from Steelworks Katowice have been used. Ductile cast iron has been produced by “IN MOLD” technology and some positive results have been obtained – they eliminate expensive charge materials and expensive technology of spheroidization.
PL
Podjęto próbę wytworzenia żeliwa sferoidalnego z surówki wielkopiecowej. Użyto surówki norweskiej i surówki polskiej z Huty Katowice. Uzyskano pozytywne wyniki stosując do wytworzenia żeliwa sferoidalnego technologii „IN MOLD”. Technologia ta eliminuje drogie materiały wsadowe i kosztowną technologię sferoidyzacji.
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