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1
Content available Evaluation of Foundry Properties of Brahmaputra River Sand and its Prospects
Rana Md. Shohel, Shahriar Md. Shams, Alam Md. Sha, Hossain Md. Imam Sohel, Biswas Pradip Kumar, Zaman Mohammad Nazin
Archives of Foundry Engineering
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2023
|
Vol. 23, iss. 2
80--90
EN
The river system of the Bengal delta encompasses a huge amount of fluvial sand; however, no comprehensive studies were available on using this river sand in foundry industries. Hence, the present research evaluates the foundry properties of trans-boundary Brahmaputra River sand and its prospects for use in foundries. Several laboratory analyses have been performed to elicit the foundry properties using standard methods of foundry analysis, including XRD, XRF, TG-DSC, and FESEM. From the study, the sand contains mainly quartz with small amounts of feldspar, amphibole, chlorite, and mica, and exhibits a subangular to subrounded shape. The sand is dominated by SiO2 (67.81-69.97%) and lesser amounts of other oxides, and it is thermally stable within 1000 °C temperature. The grain fineness number (64-79), mineralogical, chemical, thermal, and foundry properties are suitable for non-ferrous metal casting without distortion. Further, the aluminum and zinc alloy casting with trials demonstrate their potential for use in the foundry industries. The outcomes of this study thus offer valuable information about utilizing Brahmaputra River sand for foundry applications.
2
Content available remote Zastosowanie biodegradowalnego polilaktydu PLA jako spoiwa do mas formierskich stosowanych w odlewnictwie
Tryznowski Mariusz, Soroczyński Artur
Przemysł Chemiczny
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2020
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T. 99, nr 10
1552--1555
PL
Zbadano przydatność polilaktydu (PLA) jako spoiwa do wielokrotnego stosowania do mas formierskich wykorzystywanych w procesach odlewniczych. PLA otrzymano z dużą wydajnością (71%) przez polikondensację laktydu. Masy formierskie z 2-proc. zawartością spoiwa uzyskano w wyniku odparowania chloroformowego roztworu PLA. Zbadano wytrzymałość na rozciąganie mas formierskich po ich wielokrotnym zawracaniu. Masy formierskie z 2-proc. zawartością PLA jako spoiwem, stapiane w wysokiej temp. 325°C można było zawracać nawet 13-krotnie, otrzymując masy charakteryzujące się dobrą jakością.
EN
Polylactide (PLA) was used as a binder for recycled molding sands in foundry processes. PLA was produced by lactide polycondensation with a high efficiency (71%). The molding sands with 2% binder content were prepd. by evaporating the solvent from CHCl3 soln. of PLA. The PLA-contg. molding sands cured at 325°C were successfully recycled up to 13 times.
3
Content available A Choice of Description Methods and Measures for the MMC Quality Features
Gawdzińska K.
Archives of Foundry Engineering
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2013
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Vol. 13, iss. 1 spec.
17--20
EN
This study proposes a procedure for the choice of description methods and the determination of measures and corresponding values of quality features used in examining metal composite castings. The procedure is herein applied to a selected feature of these materials, namely reinforcement phase distribution of the casting. The proposed procedure can be successfully used for describing quality features of such common materials as cast iron, cast steel, light metal alloys and composite materials.
PL
W niniejszej pracy zaproponowano postępowanie dotyczące wyboru metod opisu oraz określania miar i wartości cech jakości odlewów z metalowych materiałów kompozytowych na wybranej cesze jakości tych tworzyw tj. jednorodności rozmieszczenia fazy zbrojącej w odlewie. Zastosowanie proponowanej drogi może być z powodzeniem stosowane do opisu cech jakości odlewów z materiałów klasycznych tj. żeliwo, staliwo, stopy metali lekkich, jak i materiałów kompozytowych.
4
Content available Overview of activities on the internet devoted to casting technology
Wilk-Kołodziejczyk D., Regulski K., Dziaduś-Rudnicka J., Kluska-Nawarecka S.
Archives of Foundry Engineering
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2012
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Vol. 12, iss. 2
245-250
EN
Article present various forms of transfer of information available on the Internet. An attempt was made to show the possibility of such a selection of the knowledge sources that, taking into account user preferences, would arouse his interest, showing in parallel the intended substantive content. This commitment is shown in the context of the current assumptions of building a platform dedicated to support the needs of production processes in foundry and metallurgy.
5
Content available remote Optimising the composition of natural moulding sands including thermal aspects
Kowalski J. S.
Archives of Foundry Engineering
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2011
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Vol. 11, iss. 2
65-68
EN
The paper discusses the problem of the choice of the moulding sand mixture composition in terms of the sand behaviour in contact with molten metal. Studies of high-temperature phenomena make assessment of the sand composition applicability under real operating conditions possible, thus leading to the elimination of sand-originating casting defects. The research was conducted on selected moulding materials included in the composition of traditional moulding sand mixtures without the addition of carbon. The effect of moulding sand composition and moisture content on the linear dilatation and stress-induced allotropic changes of quartz was examined. The analysis of these phenomena was based on 3D charts and maps generated from data collected during the tests.
6
Content available remote The effect of refractory coating permeability on the Lost Foam Process
Pacyniak T.
Archives of Foundry Engineering
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2008
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Vol. 8, iss. 3
199-204
EN
The article analyses the effect of refractory coating permeability on the process of casting manufacture by the Lost Foam technique. The analysis was focussed on simulation tests examining the effect of coating permeability on the mould cavity filling rate, pressure in gas gap, and the size of this gap. In simulation tests of the Lost Foam Process, a mathematical model of the process presented in this study and the author's own computation algorithm were used. The computations have proved that with increasing permeability of the protective coating, the pouring rate increases, too, while pressure of gas in the gas gap and the size of the gap are decreasing. The increasing pouring rate ensures correct making of castings, even if their shape is very intricate and the wall cross-sections are very small. Smaller size of the gas gap and lower gas pressure in the gap reduce the risk of mould damage. The author's own investigations confirmed the importance of the refractory coating permeability and its effect on the casting process, mould pouring rate - in particular.
7
Content available remote Modeling of mould cavity filling process with cast iron in Lost Foam method Part 3. Mathematical model – pressure inside the gas gap
Pacyniak T., Kaczorowski R.
Archives of Foundry Engineering
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2008
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Vol. 8, iss. 3s
79--83
EN
In this work mathematical model describing changes of pressure inside the gas gap was shown during manufacturing gray cast iron castings with use of lost foam process. Authors analyzed the results of numerical simulation enclosing influence of foamed polystyrene pattern density, permeability and thickness of refractory coating on pressure changes in the gap. Studies have shown, that all these parameters have significant influence on pressure inside the gas gap.
8
Content available remote Modeling of mould cavity filling process with cast iron in Lost Foam method Part 1. Mathematical model – rate of pattern gasification
Pacyniak T., Kaczorowski R.
Archives of Foundry Engineering
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2008
|
Vol. 8, iss. 3s
69--74
EN
In this work a mathematical model of mould cavity filling process with cast iron for lost foam method was shown, enclosing phenomena connected with gasification of foamed polystyrene pattern. For its description the thermal balance equation was used, which together with pouring rate equations (part 2) and pressure change equations (part 3) enabled determination of permeability, refractory coating thickness and foam pattern density influence on pouring rate, gas pressure in gas gap and its size. In this work authors showed results of numerical simulation concerning rate of pattern gasification and gas gap size, based on developed mathematical model. Presented studies indicated, that with decrease in coating permeability and increase in its thickness the gas gap size increased causing the decrease of foamed polystyrene pattern gasification rate.
9
Content available remote Modeling of mould cavity filling process with cast iron in Lost Foam method Part 2. Mathematical model – Pouring rate
Pacyniak T., Kaczorowski R.
Archives of Foundry Engineering
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2008
|
Vol. 8, iss. 3s
75--78
EN
In this work pouring rate equation for cast iron in lost foam process was shown. For description of this phenomenon the motion dynamic equation was used. Pressure affecting the liquid cast iron surface was described using Bernoulli formulae. Numerical simulation results were analyzed with respect to permeability, refractory coating thickness and foamed polystyrene pattern density influence on pouring rate.
10
Content available remote Continuous temperature measurements on the pouring stand for casting moulds
Leśniewski W., Karwiński A.
Archives of Foundry Engineering
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2008
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Vol. 8, iss. 1
75-80
EN
The results of temperature measurements of liquid iron alloys obtained by means of the pyrometer, PDR-1800 series, are presented in the paper. The measurements were performed in conditions determined by the kind of a pouring device. The results obtained for bottom-tap ladles were supplemented by laboratory measurements. These results allow explaining significant differences in the results of temperature measurements performed in pouring ladles by means of the pyrometric method and immersible thermocouple, which - in turn - improves assessment of metal thermal parameters in pouring devices.
11
Content available remote Symulacja numeryczna krzepnięcia odlewu osiowo-symetrycznego wypełnianego od dołu z dolewaniem do nadlewu
Parkitny R., Sowa L.
Archiwum Odlewnictwa
|
2001
|
R. 1, nr 2
283--288
PL
W pracy sformułowano model matematyczny i numeryczny procesu krzepnięcia odlewu o kształcie cylindrycznym z uwzględnieniem procesu syfonowego wypełniania wnęki formy ciekłym metalem z dolewaniem do nadlewu. Uwzględniono wzajemną zależność zjawisk cieplnych i dynamicznych. Pola prędkości otrzymano z rozwiązania równań Naviera-Stokesa i równania ciągłości, natomiast pola temperatury z rozwiązania równania przewodnictwa ciepła z członem konwekcyjnym. Postawione zadanie rozwiązano metodą elementów skończonych. Oceniano wpływ parametrów i sposobu zalewania metalu na kinetykę narastania fazy stałej w procesie krzepnięcia odlewu. Dążono do otrzymania odlewu bez wad pochodzenia skurczowego.
EN
In the paper, a mathematical and a numerical model of the solidification of a cylindrical shaped casting, in which it is taken into account the process of filling the mould cavity with molten metal from the mould bottom and its adding to the top of a riser head, has been proposed. In the mathematical model interdependence between thermal and dynamical phenomena has been also considered. The velocity fields were obtained by solving the Navier-Stokes equations and the continuity equation, while the thermal fields were obtained by solving the equation of heat conductivity containing the convection term. The problem was solved by the finite element method. The influences of pouring parameters and cases of metal mould pouring on the solidification kinetics of the casting were estimated. One aims in the paper to obtain a casting without shrinkage defect.
12
Odlewnictwo metali i nowe tworzywa na rynkach europejskich i światowych
Engels G.
Przegląd Odlewnictwa
|
1999
|
Vol. 49, z. 1
1-9
PL
W artykule przedstawiono zmiany strukturalne w produkcji odlewów wynikające z postępu technicznego w hutnictwie oraz w przemyśle motoryzacyjnym. Wskazano na wzrost produkcji odlewów ze stopów metali lekkich przy jednoczesnym wprowadzaniu nowych technologii. Wymieniono opinie kilkunastu kierowników odlewni co do kwalifikacji i umiejętności, które powiniem mieć inżynier pracujący w odlewni w nadchodzącym wieku.
EN
Structural changes in the production of castings resulting from technical progress in metallurgy and in automotive industry have been presented. The increase in the production of light metals alloys castings and the simultaneous introduction of new technologies have been indicated. Opinions of several foundry managers on the qualifications and skills required from an engineer working in the foundry in the coming century have been quoted.
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