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Wyświetlanie 1-15 z 18
Tytuł:
Thermal Reclamation Process of the Spent Moulding Sand with the Polymer BioCo2 Binder
Autorzy:
Grabowska, B.
Łucarz, M.
Kaczmarska, K.
Powiązania:
https://bibliotekanauki.pl/articles/382132.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
spent sand
polymeric binder BioCo
thermal analysis
thermal reclamation
thermal reclaimer
zużyta masa
spoiwo polimerowe BioCo
analiza termiczna
rekultywacja
Opis:
The results of the thermal reclamation investigations of the spent moulding sand with the polymer BioCo2 binder, are presented in the paper. The reclamation process of the quartz matrix was carried out on the basis of the author's own method of selecting the reclamation temperature. On the bases of the performed thermo-gravimetric analysis of the binder the temperature range required for the efficient thermal reclamation was indicated. In order to confirm the assumption the thermal reclamations were performed at a temperature determined by the TG and - for comparisons - at a lower and higher temperature. During the reclamation process samples of the reclaim were taken for testing ignition losses in order to determine the process efficiency. The correctness of the assumed method of selecting the temperature range of the thermal reclamation of spent moulding sand with the polymer BioCo2 binder was confirmed.
Źródło:
Archives of Foundry Engineering; 2014, 14, 3 spec.; 90-94
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Stand Adopted For Process Investigations Thermal Reclamation
Autorzy:
Łucarz, M.
Powiązania:
https://bibliotekanauki.pl/articles/380528.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
thermal reclamation
used sand
foundry engineering
regeneracja termiczna
masa zużyta
odlewnictwo
Opis:
The paper presents the analysis of construction solutions of some thermal reclamation equipment applied in used sand reclamation treatment as well as the experimental appliance constructed according to the author`s own idea. The experimental apparatus enables the sand grains to be regained when the machine works in either the horizontal or the vertical position. Different construction versions of the apparatus were prepared to provide a variety of working conditions for thermal reclamation treatment in order to obtain the reclaimed sand in the most efficient way. The possibility of choosing from among various set points of the appliance, such as the temperature of reclamation process, the time of thermal treatment cycle, the method of fluidization (cold or hot air) and other individual parameters characteristic of particular construction versions create the conditions for comparative research.
Źródło:
Archives of Foundry Engineering; 2013, 13, 1 spec.; 103-106
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Conditions of Thermal Reclamation Process Realization on a Sample of Spent Moulding Sand from an Aluminum Alloy Foundry Plant
Autorzy:
Łucarz, M.
Dereń, M.
Powiązania:
https://bibliotekanauki.pl/articles/382337.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
spent moulding sand
organic binders
thermal destruction
ignition loss
mechanical reclamation
thermal reclamation
zużyte masy formierskie
spoiwa organiczne
zniszczenie termiczne
straty prażenia
regeneracja mechaniczna
regeneracja termiczna
Opis:
The results of investigations of thermal reclamation of spent moulding sands originating from an aluminum alloy foundry plant are presented in this paper. Spent sands were crushed by using two methods. Mechanical fragmentation of spent sand chunks was realized in the vibratory reclaimer REGMAS. The crushing process in the mechanical device was performed either with or without additional crushing-grinding elements. The reclaimed material obtained in this way was subjected to thermal reclamations at two different temperatures. It was found that a significant binder gathering on grain surfaces favors its spontaneous burning, even in the case when a temperature lower than required for the efficient thermal reclamation of furan binders is applied in the thermal reclaimer. The burning process, initiated by gas burners in the reclaimer chamber, generates favorable conditions for self-burning (at a determined amount of organic binders on grain surfaces). This process is spontaneously sustained and decreases the demand for gas. However, due to the significant amount of binder, this process is longer than in the case of reclaiming moulding sand prepared with fresh components.
Źródło:
Archives of Foundry Engineering; 2017, 17, 2; 197-201
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal Coefficients of the GTAW Process
Autorzy:
Orłowicz, A. W.
Trytek, A.
Tupaj, M.
Mróz, M.
Powiązania:
https://bibliotekanauki.pl/articles/383027.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
thermal efficiency
remelting process
flow calorimeter
sprawność cieplna
przetapianie
kalorymetr przepływowy
Opis:
The paper presents a discussion on the issue of thermal efficiency of the process of superficial remelting of castings by means of the gas tungsten arc welding (GTAW) process. Described and characterized are calorimeters used in research studies on efficiency of welding processes and the obtained results. Example results are presented from the measurements aimed at determination of thermal efficiency of the welding process carried out with the use of the flow calorimeter.
Źródło:
Archives of Foundry Engineering; 2015, 15, 3 spec.; 63-68
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Crystallization of AlSi17Cu5Mg Alloy after Time-thermal Treatment
Autorzy:
Piątkowski, J.
Kamiński, P.
Powiązania:
https://bibliotekanauki.pl/articles/382327.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
hypereutectic Al-Si alloy
overheating
thermal analysis
crystallization process
stop nadeutektyczny Al-Si
przegrzanie
analiza termiczna
proces krystalizacji
Opis:
In the dissertation it has been shown, that so called “time-thermal treatment” (TTT) of the alloy in liquid state as overheating the metal with around 250°C above Tliq. and detailing it in temperature for 30 to 40 minutes has the influence on changing the crystallization parameters (Tliq., TEmin., TEmax., TE(Me), TSol.). It was ascertained, that overheating the AlSi17Cu5Mg alloy substantially above Tliq. results with microcrystalline structure. Evenly distributed in the eutectic warp primeval silicon crystals and supersaturated with alloying additives of base content (Cu, Mg, Fe) of α(Al) solution, ensures not only increase durability in ambient temperature, but also at elevated temperature (250°C), what due to it’s use in car industry is an advantage.
Źródło:
Archives of Foundry Engineering; 2015, 15, 1; 83-86
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Definition of alloy substitute thermal capacity using the simple macrosegregation models
Autorzy:
Mochnacki, B.
Powiązania:
https://bibliotekanauki.pl/articles/380456.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
technologia informatyczna
przemysł odlewniczy
proces krzepnięcia
zastępcza pojemność cieplna
metody numeryczne
information technology
foundry industry
solidification process
one domain method
substitute thermal capacity
numerical methods
Opis:
Mathematical description of alloys solidification in a macro scale can be formulated using the one domain method (fixed domain approach). The energy equation corresponding to this model contains the parameter called a substitute thermal capacity (STC). The analytical form of STC results from the assumption concerning the course of the function fs = fs (T) describing the changes of solid state volumetric fraction and the temperature at the point considered. Between border temperatures Ts , Tl the function fs changes from 1 to 0. In this paper the volumetric fraction fs (more precisely fl = 1- fs) is found using the simple models of macrosegregation (the lever arm rule, the Scheil model). In this way one obtains the formulas determining the course of STC resulting from the certain physical considerations and this approach seems to be closer to the real course of thermal processes proceeding in domain of solidifying alloy.
Źródło:
Archives of Foundry Engineering; 2012, 12, 4; 113-116
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Structure on the Thermophisical Properties of Thin Walled Castings
Autorzy:
Górny, M.
Lelito, J.
Kawalec, M.
Sikora, G.
Powiązania:
https://bibliotekanauki.pl/articles/382519.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
solidification process
thin walled casting
graphite morphology
thermal diffusivity
specific heat
thermal conductivity
proces krzepnięcia
odlew cienkościenny
morfologia grafitu
dyfuzyjność termiczna
ciepło właściwe
przewodność cieplna
Opis:
This study addresses the effect of the cooling rate and of titanium additions on the thermophysical parameters of thin-walled compacted graphite iron (TWCGI) castings. Various molding materials were used (silica sand and insulating sand LDASC- Low-Density Alumina-Silicate Ceramic) to achieve different cooling rates. Different titanium additions were caused by various amount of Ferro Titanium. The research work was conducted for thin-walled iron castings with a 3-mm wall thickness. The tested material represents the occurrence of graphite in the shape of flakes (C and D types, according to the ISO Standard), nodules or compacted graphite with a percent of nodularity and different shape factor. Thermal conductivity has been determined by the laser flash technique in a temperature range of 22-600°C. The results show that the cooling rates together with the titanium content largely influence the graphite morphology and finally thermal conductivity of thin walled iron castings.
Źródło:
Archives of Foundry Engineering; 2015, 15, 2 spec.; 23-26
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Crystallization Process of Silicon Molybdenum Cast Iron
Autorzy:
Stawarz, M.
Powiązania:
https://bibliotekanauki.pl/articles/379482.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
theory of crystallization
metallographic analysis
molybdenum carbide
thermal derivative analysis
SiMo
teoria krystalizacji
analiza metalograficzna
węglik molibdenu
analiza termiczna
analiza derywacyjna
Opis:
The article presents results of studies of silicon – molybdenum cast iron (4.42% Si, 2.59% Mo and 2.48% C wt.-%) crystallization process. Metallographic analysis was carried out using SEM-scanning electron microscopy with the EDS system. In order to determine the phase composition, X-ray diffraction studies were performed. Thermo-Calc, a computer simulation program, was used to simulate the crystallization process. . The obtained data allowed to describe the effect of some elements on the crystallization process. The silicon phase of MnSi could not be identified during metallographic studies. Also, computer simulation of the crystallization process did not answer the question at which point the silicon phase of MnSi crystallizes in the tested alloy. Therefore, not all results obtained were linked to the registered crystallization process (TDA process). The EDS analysis revealed an unusual distribution of molybdenum in the microstructure of the sample, where it is clearly visible that the area enriched with this element is also the separation of spheroidal graphite. The possibility of occurrence of Mo-rich micro-areas found in graphite is considered. The case is debatable and difficult to resolve at this stage. Perhaps, at such a high concentration of molybdenum (2.59% Mo) in the alloy, conditions are created for simultaneously crystallization of graphite and molybdenum phases.
Źródło:
Archives of Foundry Engineering; 2018, 18, 2; 100-104
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza środowiskowa warunków topienia brązów aluminiowych
Environmental Analysis for the Melting of Aluminum Bronzes Process
Autorzy:
Schlafka, P.
Bydałek, A. W.
Bydałek, A.
Powiązania:
https://bibliotekanauki.pl/articles/379809.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
topienie metali
analiza termiczna
właściwości
melting metals
thermal analysis
properties
Opis:
W artykule przedstawiona zostanie analiza środowiskowych oddziaływań żużlowych powłok rafinujących w warunkach topienia brązów aluminiowych. Zostaną pokazane analizy termiczno-różnicowe analizowanych powłok rafinacyjnych. Przeprowadzona zostanie analiza powstających produktów.
Not yet been clarified issues impact the individual components of slag refining. This applies to impacts on the process of mass transfer and the environment. For these ingredients include substances of stimulating the process of refining slag. The aim of the present study was to show the possibility of optimizing the components of the slag, through the use of stimulating substances intentionally introduced in the conditions of melting aluminum bronzes conditions. The analysing of the studied refiners compositions at an angle of environmental impacts noted a significant impact promoters containing sodium fluoride. Changes refining effect (on the plus side), however cause significant environmental burden. As evidenced by the results presented in Table 5 it follows that not only a fluorine leak out of the slag, but also react with the compounds of silicon and calcium. Compounds of fluorine therefore create a risk to the ambient gas in foundries. To the detriment of chloride NaCl speaks while the formation of water-soluble compounds which may pose a risk to groundwater. However, this can be countered through special bulkheads for storage of waste slag. We conclude that under the conditions of melting aluminum bronzes should be used slags containing no fluorine compounds.
Źródło:
Archives of Foundry Engineering; 2014, 14, 2 spec.; 71-76
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical Modelling of Fluid Flow and Thermal Phenomena in the Tundish of CSC Machine
Autorzy:
Sowa, L.
Powiązania:
https://bibliotekanauki.pl/articles/380813.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
solidification process
foundry industry
information technology
continuous casting
molten metal
krzepnięcie
przemysł odlewniczy
odlewanie ciągłe
metal płynny
Opis:
The mathematical and numerical simulation model of the liquid steel flow in a tundish is presented in this paper. The problem was treated as a complex and solved by the finite element method. The single-strand slab tundish is used to continuous casting slabs. The internal work space of the tundish was modified by the following flow control devices. The first device was a striker pad situated in the pouring tundish zone. The second device was a baffle with three holes and the third device was a baffle without hole. The main purpose of using these devices was to cause a quiet liquid mixing as well as give directional metal flow upwards which facilitated inclusion floatation. The interaction of flow control devices on hydrodynamic conditions was received from numerical simulation. As a result of the computations carried out, the liquid steel flow and steel temperature fields were obtained. The influence of the tundish modification on velocity fields in the liquid phase of steel was estimated, because these have an essential influence on high quality of a continuous steel cast slab.
Źródło:
Archives of Foundry Engineering; 2014, 14, 1; 103-106
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental Verification of the Cast Iron Solidification Model
Autorzy:
Mendakiewicz, Jerzy
Powiązania:
https://bibliotekanauki.pl/articles/2174627.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
foundry industry
application of information technology
solidification process
numerical techniques
thermal analysis
derivative analysis
przemysł odlewniczy
zastosowanie technologii informatycznych
krzepnięcie
techniki numeryczne
analiza termiczna
Opis:
The article concerns the experimental verification of the numerical model simulating the solidification and cooling processes proceeding in the domain of cast iron casting. The approximate course of the function describing the evolution of latent heat and the value of substitute specific heat resulting from its course were obtained using the thermal and derivative analysis (TDA) method The TDA was also used to measure the cooling curves at the distinguished points of the casting. The results obtained in this way were compared with the calculated cooling curves at the same points. At the stage of numerical computations, the explicit scheme of the finite difference method was applied. The agreement between the measured and calculated cooling curves is fully satisfactory.
Źródło:
Archives of Foundry Engineering; 2022, 22, 3; 91--94
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment method of overheating degree of a spent moulding sand with organic binder, after the casting process
Autorzy:
Dańko, R.
Powiązania:
https://bibliotekanauki.pl/articles/381504.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
moulding sand
thermal degradation
organic binder
simulation calculations
masa formierska
degradacja termiczna
spoiwo organiczne
obliczenia symulacyjne
Opis:
A proper management of sand grains of moulding sands requires knowing basic properties of the spent matrix after casting knocking out. This information is essential from the point of view of the proper performing the matrix recycling process and preparing moulding sands with reclaimed materials. The most important parameter informing on the matrix quality – in case of moulding sands with organic binders after casting knocking out – is their ignition loss. The methodology of estimating ignition loss of spent moulding sands with organic binder – after casting knocking out - developed in AGH, is presented in the paper. This method applies the simulation MAGMA software, allowing to determine this moulding sand parameter already at the stage of the production preparation.
Źródło:
Archives of Foundry Engineering; 2013, 13, 2; 11-16
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Increasing Precision and Yield in Casting Production by Simulation of the Solidification Process Based on Realistic Material Data Evaluated from Thermal Analysis (Using the ATAS MetStar System)
Autorzy:
Persson, P-E
Ignaszak, Z.
Fransson, H.
Kropotkin, V.
Andersson, R.
Kump, A.
Powiązania:
https://bibliotekanauki.pl/articles/382019.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
ductile iron
simulation
defect prognosis
density calibration
thermal analysis
żeliwo sferoidalne
symulacja
prognozowanie defektów
kalibracja gęstości
analiza termiczna
Opis:
The conducted work shows and confirms how thermal analysis of grey and ductile iron is an important source for calculating metallurgical data to be used as input to increase the precision in simulation of cooling and solidification of cast iron. The aim with the methodology is to achieve a higher quality in the prediction of macro– and micro porosity in castings. As comparison objects standard type of sampling cups for thermal analysis (solidification module M ≈ 0.6 cm) is used. The results from thermal analysis elaborated with the ATAS MetStar system are evaluated parallel with the material quality (including tendency to external and internal defects) of the tested specimen. Significant temperatures and calculated quality parameters are evaluated in the ATAS MetStar system and used as input to calibrate the density curve as temperature function in NovaFlow&Solid simulation system. The modified data are imported to the NovaFlow&Solid simulation system and compared with real results.
Źródło:
Archives of Foundry Engineering; 2019, 1; 109-116
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rule of the fluoride stymulators in to the Carbo-N-Ox method during aluminium bronze melting process
Autorzy:
Bydałek, A. W.
Schlafka, P.
Powiązania:
https://bibliotekanauki.pl/articles/379535.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
refining
stimulator
slag
thermal analysis
copper alloy
rafinacja
stymulator
żużel
analiza cieplna
stop miedzi
Opis:
During the slag refining process, in the real systems, the complex processes of mass exchange appear. Some relations between the stimulators in the environment - slag - metal system allow to initiate mass exchange reactions in the process of slag refining. Due to this kind of influences there is a possibility of direction and control of melting copper and it’s alloys.
Źródło:
Archives of Foundry Engineering; 2013, 13, 3; 15-18
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Reclamation Process on the Ecological Quality of Reclaim Sand
Autorzy:
Dereń, M.
Łucarz, M.
Roczniak, A.
Kmita, A.
Powiązania:
https://bibliotekanauki.pl/articles/380811.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
thermal reclamation
loss of ignition
molding sand
elution analysis
environment protection
regeneracja termiczna
strata prażenia
masa formierska
ochrona środowiska
Opis:
In this article, there were presented results of research on influence of reclamation process on the ecological quality of reclaim sand with furan resin used in nonferrous foundry. The quality of reclaimed sand is mainly define by two group of chemical substances from elution of reclaimed sand: Dissolves Organic Carbon (DOC) and Total Dissolves Solids (TDS). Reclaimed sand used in test was prepared in experimental thermal reclaimer and mechanical vibration reclaimer REGMAS installed in Faculty of Foundry Engineering at University of Science and Technology in Krakow. The reference point is molding sand shaking out and crumble in jaw crusher. Test of elution was made in acreditation laboratory in Center For Research and Environmental Control in Katowice up to the standard with Dissolves Organic Carbon (DOC) - PN-EN 1484:1999; Total Dissolves Solids (TDS) - PN-EN 15216:2010. The standard for elution test is PN-EN 12457- 4:2006. Except that we were made loss of ignition test, to check how many resin was rest on sand grains.
Źródło:
Archives of Foundry Engineering; 2017, 17, 4; 43-46
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 18

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