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Tytuł:
Determination of heat accumulation coefficient for oil bonded moulding sands
Autorzy:
Łągiewka, M.
Konopka, Z.
Zyska, A.
Nadolski, M.
Powiązania:
https://bibliotekanauki.pl/articles/379643.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
theoretical basis
casting processes
moulding material
oil binder
heat accumulation coefficient
moulding sand
temperature equalization coefficient
podstawy teoretyczne
proces odlewniczy
materiał formierski
spoiwo olejowe
współczynnik akumulacji ciepła
masa odlewnicza
Opis:
The possibility of controlling the solidification and cooling time of castings creates prospects of improving their structure and by the same their properties. Thermal properties of the mould constitute therefore an important factor which is necessary to consider while seeking for the mentioned improvement. The presented work illustrates the method of determining some basic thermal coefficients of moulding material, i.e. the coefficient of temperature equalisation a2, known also as the temperature diffusivity, and the heat accumulation coefficient b2, which characterises the ability of moulding material to draw away the heat from a casting. The method consists in experimental determining the temperature field within the mould during the processes of pouring, solidification and cooling of the casting. The performed measurements allow for convenient and exact calculations of the sought-after coefficients. Examinations were performed for the oil bonded moulding sand of trade name OBB SAND ‘E’. The experiment showed that the obtained value of b2 coefficient differs from the value calculated on the basis of theoretical considerations available in publications. Therefore it can be stated that theoretical calculations of the heat accumulation coefficient are thus far not sufficient and not quite reliable, so that these calculations should be verified experimentally.
Źródło:
Archives of Foundry Engineering; 2013, 13, 2; 91-94
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Influence of the Method of Mould Filling on the Quality of Castings Made of EN AC-44000 or EN AC-46200 Alloy
Autorzy:
Nadolski, M.
Konopka, Z.
Łągiewka, M.
Zyska, A.
Powiązania:
https://bibliotekanauki.pl/articles/380335.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
innovative foundry materials
innovative foundry technologies
plaster mould
counter-gravity casting
vacuum casting
innowacyjne materiały odlewnicze
innowacyjne technologie odlewnicze
forma odlewnicza
odlewanie próżniowe
Opis:
The performed examinations concerning the process of filling the plaster ceramic moulds with aluminium alloys allowed to assess the influence of various methods of introducing the metal into the mould cavity on the macro- and microstructure of the obtained experimental castings. The comparison was performed for castings with graded wall thickness made either of EN AC-44000 alloy or of EN AC-46000 alloy, produced either by gravity casting, or by gravity casting with negative pressure generated around the mould (according to the Vacumetal technology), or by counter-gravity casting. It was found that the silicon crystals grow in size with an increase in wall thickness due to the slower cooling and solidification of castings.
Źródło:
Archives of Foundry Engineering; 2014, 14, 4; 73-76
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Influence of Graphite Type on the Abrasive Wear of AlMg10 Matrix Composites
Autorzy:
Łągiewka, M.
Konopka, Z.
Zyska, A.
Nadolski, M.
Powiązania:
https://bibliotekanauki.pl/articles/380925.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
cast composites
abrasion resistant alloys
graphite particles
alloy AlMg
electrographite
kompozyty
stopy odporne na ścieranie
cząsteczki grafitu
stop AlMg
elektrografit
Opis:
The presented work discuss the influence of various types of graphite additions on the abrasive wear of AlMg10 matrix alloy composites. Flake graphite, electrographite, and short graphite fibre were used as a composite reinforcement. Composites containing 10 vol. % of graphite particles were produced by mechanical mixing of the liquid alloy with simultaneous introduction of the reinforcement. Composite suspensions were gravity cast into metal moulds. The achieved castings were tested for the abrasive wear. Also the pure matrix alloy was examined. Microphotographs of the produced materials were taken, the specimens were also examined after the abrasion test by observing the microsections perpendicular to the abraded surface. The carried out experiments allow to state that even the little addition of graphite influences beneficially the tribological properties of composite under small loads applied to the frictional pair. It was found that under the increased load (30 N) the least abrasive wear is exhibited by the composite reinforced with graphite fibre, the largest one occurring for the composite reinforced with electrographite. The composite reinforced with electrographite, however, exhibited the mass loss less by 25% than the pure matrix alloy.
Źródło:
Archives of Foundry Engineering; 2015, 15, 1 spec.; 65-68
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of the strengthening coefficient of pressure cast AlSi13Cu2/chopped carbon fibre composite
Wyznaczenie współczynnika umocnienia kompozytu AlSi13Cu2-cięte włókna węglowe odlewanego ciśnieniowo
Autorzy:
Konopka, Z.
Łągiewka, M.
Nadolski, M.
Zyska, A.
Powiązania:
https://bibliotekanauki.pl/articles/354794.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
metal matrix composites
pressure die casting
strengthening
kompozyty z osnową metaliczną (MMC)
odlewanie ciśnieniowe
umocnienie
Opis:
The purpose of the work is the determination of the strengthening coefficient for the AlSi13Cu2 alloy matrix composite reinforced with chopped carbon fibre and produced by high-pressure casting method. This coefficient was determined during the static tensile test using the Ramberg-Osgood equation. The regression relationships between strain and stress were established, serving as a basis for finding the strengthening coefficient values. The measurements and calculations were performed also for the matrix alloy itself, for the purpose of comparison. The examined coefficient decreased with an increase of fibre fraction in the composite. Its value for composite containing 15 vol. % of chopped fibre was found to be lower by 30% than the value determined for matrix alloy, what means the strengthening of the alloy to such a degree.
Celem pracy jest wyznaczenie współczynnika umocnienia kompozytu na osnowie stopu AlSi13Cu2 zbrojonego ciętymi włóknami węglowymi wytworzonego metodą ciśnieniowego odlewania. Współczynnik ten wyznaczono w statycznej próbie rozciągania korzystając z równania Ramberga-Osgooda. Opracowano regresyjne zależności odkształcenia i naprężenia, na podstawie których wyznaczono współczynnik umocnienia. Dla porównania wykonano pomiary dla stopu osnowy bez włókien. Stwierdzono zmniejszenie się tego współczynnika ze wzrostem udziału włókien w kompozycie. Jego wartość dla kompozytu zawierającego 15% obj. ciętych włókien jest o około 30% niższa od wartości wyznaczonej dla stopu osnowy, co oznacza, że materiał został w takim stopniu umocniony.
Źródło:
Archives of Metallurgy and Materials; 2013, 58, 3; 957-960
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Influence of Pressure Die Casting Parameters on the Castability of AlSi11-SiCp Composites
Autorzy:
Konopka, Z.
Zyska, A.
Łągiewka, M.
Nadolski, M.
Powiązania:
https://bibliotekanauki.pl/articles/382419.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
composite casting
pressure die casting
castability of composite
kompozyt odlewany
odlewanie ciśnieniowe
lejność kompozytu
Opis:
The paper presents the method of preparing a composite slurry composed of AlSi11 alloy matrix and 10 vol.% of SiC particles, as well as the method of its high-pressure die casting and the measurement results concerning the castability of the obtained composite. Composite castings were produced at various values of the piston velocity in the second stage of injection, diverse intensification pressure values, and various injection gate width values. There were found the regression equations describing the change of castability of the examined composite as a function of pressure die casting process parameters. The conclusion gives the analysis and the interpretation of the obtained results.
Źródło:
Archives of Foundry Engineering; 2015, 15, 1; 29-34
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structure and selected properties of high-aluminium Zn alloy with silicon addition
Autorzy:
Zyska, A.
Konopka, Z.
Łągiewka, M.
Nadolski, M.
Powiązania:
https://bibliotekanauki.pl/articles/379494.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
ZnAl alloy
tribological properties
thermal expansion
stop ZnAl
właściwości trybologiczne
rozszerzalność cieplna
Opis:
The results of examinations concerning the abrasive wear resistance, hardness, and thermal expansion of high-aluminium zinc alloys are presented. The examinations were carried out for five synthetic ZnAl28 alloys with variable silicon content ranging from 0.5% to 3.5%, and – for the purpose of comparison – for the standardised ZnAl28Cu4 alloy. It was found that silicon efficiently increases the tribological properties and decreases the coefficient of thermal expansion of zinc alloys. The most advantageous set of the examined properties is exhibited by the alloys containing over 2.5% Si. They are characterised by higher parameters as compared with the standardised alloy. Observations of microstructures reveal that silicon precipitates as a separate compact phase, and its morphology depends on the Si content in the alloy. The performed examinations show that silicon can satisfactorily replace copper in high aluminium Zn alloys, thus eliminating the problem of dimensional instability of castings.
Źródło:
Archives of Foundry Engineering; 2011, 11, 3 spec.; 261-264
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of benzoyl peroxide on gelation rate of silica binder for precision casting
Autorzy:
Nadolski, M.
Konopka, Z.
Łągiewka, M.
Zyska, A.
Powiązania:
https://bibliotekanauki.pl/articles/379607.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
precision casting
moulding material
colloidal silica
odlewanie precyzyjne
materiał formierski
krzemionka koloidalna
Opis:
Substituting of ethyl silicate with ecologic sols of colloidal silica in the investment casting technology, resulting from the increased demands concerning environmental protection, caused the prolongation of production cycle for precision castings produced in multi-layer thin-walled ceramic shell moulds. Modification of Sizol 030 binder with benzoyl peroxide, proposed in the paper, was aimed at restriction of time needed for realization of a single layer of the shell mould, and by the same, of such a mould as a whole. Examination of kinetics of the drying process were held for the layers made of prepared moulding material and the influence of binder modification on the mould curing time was determined.
Źródło:
Archives of Foundry Engineering; 2013, 13, 2; 99-102
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Porosity of Castings Produced by the Vacuum Assisted Pressure Die Casting Method
Autorzy:
Zyska, A.
Konopka, Z.
Łągiewka, M.
Nadolski, M.
Powiązania:
https://bibliotekanauki.pl/articles/379699.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
innovative foundry technology
aluminium alloy
vacuum assisted pressure
die casting
casting defect
porosity
innowacyjna technologia odlewnicza
stop aluminium
formowanie podciśnieniowe
odlewanie ciśnieniowe
wada odlewu
porowatość
Opis:
The paper presents the results of investigations concerning the influence of negative (relative) pressure in the die cavity of high pressure die casting machine on the porosity of castings made of AlSi9Cu3 alloy. Examinations were carried out for the VertaCast cold chamber vertical pressure die casting machine equipped with a vacuum system. Experiments were performed for three values of the applied gauge pressure: -0.3 bar, -0.5 bar, and -0.7 bar, at constant values of other technological parameters, selected during the formerly carried initial experiments. Porosity of castings was assessed on the basis of microstructure observation and the density measurements performed by the method of hydrostatic weighing. The performed investigation allowed to find out that – for the examined pressure range – the porosity of castings decreases linearly with an increase in the absolute value of negative pressure applied to the die cavity. The negative pressure value of -0.7 bar allows to produce castings exhibiting porosity value less than 1%. Large blowholes arisen probably by occlusion of gaseous phase during the injection of metal into the die cavity, were found in castings produced at the negative pressure value of -0.3 bar. These blowholes are placed mostly in regions of local thermal centres and often accompanied by the discontinuities in the form of interdendritic shrinkage micro-porosity. It was concluded that the high quality AlSi9Cu3 alloy castings able to work in elevated temperatures can be achieved for the absolute value of the negative pressure applied to the die cavity greater than 0.5 bar at the applied set of other parameters of pressure die casting machine work.
Źródło:
Archives of Foundry Engineering; 2015, 15, 1; 125-130
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Assessment of Modification of High-Zinc Aluminium Alloy
Autorzy:
Zyska, A.
Konopka, Z.
Łągiewka, M.
Nadolski, M.
Powiązania:
https://bibliotekanauki.pl/articles/380248.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
aluminium alloys
inoculation
solidification
mechanical properties
stopy aluminium
krzepnięcie
właściwości mechaniczne
Opis:
The results of examinations of the influence of titanium-boron inoculant on the solidification, the microstructure, and the mechanical properties of AlZn20 alloy are presented. The examinations were carried out for specimens cast both of the non-modified and the inoculated alloy. There were assessed changes in the alloy overcooling during the first stage of solidification due to the nuclei-forming influence of the inoculant. The results of quantitative metallographic measurements concerning the refinement of the grain structure of casting produced in sand moulds are presented. The cooling rate sensitivity of the alloy was proved by revealing changes in morphology of the α-phase primary crystals. Differences in mechanical properties resulting from the applied casting method and optional inoculation were evaluated.
Źródło:
Archives of Foundry Engineering; 2014, 14, 2; 53-56
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Influence of the Mould Filling Conditions on the Quality of Castings Made of EN AC-44000 Alloy
Autorzy:
Nadolski, M.
Konopka, Z.
Łągiewka, M.
Zyska, A.
Powiązania:
https://bibliotekanauki.pl/articles/380440.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
innovative foundry materials
innovative foundry technologies
plaster mould
counter-gravity casting
vacuum casting
innowacyjne materiały odlewnicze
innowacyjne technologie odlewnicze
forma odlewnicza
odlewanie próżniowe
Opis:
The work deals with the influence of change in the filling conditions of the ceramic moulds with plaster binder on the presence of gaseous porosity and the microstructure of the achieved test castings with graded wall thickness. Castings made of EN AC-44000 alloy, produced either by gravity casting, or by gravity casting with negative pressure generated around the mould (according to the Vacumetal technology), or by counter-gravity casting were compared. The results of examinations concerning the density of the produced castings indicate that no significant change in porosity was found. The increased size of silicon crystals was found for the increased wall thicknesses due to the slower cooling and solidification of castings.
Źródło:
Archives of Foundry Engineering; 2014, 14, 2; 19-22
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effect of Vacuum Assistance on the Quality of Castings Produced by High Pressure Die Casting Method
Autorzy:
Łągiewka, M.
Konopka, Z.
Nadolski, M.
Zyska, A.
Powiązania:
https://bibliotekanauki.pl/articles/380704.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
innovative foundry technologies
aluminium alloys
quality of castings
surface roughness
defects in pressure die castings
innowacyjne technologie odlewnicze
stopy aluminium
jakość odlewów
chropowatość powierzchni
defekty
Opis:
The presented work is aimed to deal with the influence of changes in the value of negative (relative) pressure maintained in the die cavity of pressure die casting machine on the surface quality of pressure castings. The examinations were held by means of the modified Vertacast pressure die casting machine equipped with a vacuum system. Castings were produced for the parameters selected on the basis of previous experiments, i.e. for the plunger velocity in the second stage of injection at the level of 4 m/s, the pouring temperature of the alloy equal to 640°C, and the die temperature of 150°C. The examinations were carried on for three selected values of negative gauge pressure: - 0.03, - 0.05, and - 0.07 MPa. The quality of casting was evaluated by comparing the results of the surface roughness measurements performed for randomly selected castings. The surface roughness was measured by means of Hommel Tester T1000. After a series of measurements it was found that the smoothest surface is exhibited by castings produced at negative gauge pressure value of - 0.07 MPa.
Źródło:
Archives of Foundry Engineering; 2014, 14, 2; 23-26
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimization of squeeze parameters and modification of AlSi7Mg alloy
Autorzy:
Zyska, A.
Konopka, Z.
Łągiewka, M.
Nadolski, M.
Powiązania:
https://bibliotekanauki.pl/articles/381007.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
mechanical properties
Al alloy
squeeze casting technology
modification
właściwości mechaniczne
stop Al
technologia prasowania
modyfikacja
Opis:
The paper present the examination results concerning mechanical properties of castings made of AlSi7MG alloy in correlation both with the most significant squeeze casting parameters and with the modification treatment. Experiments were planned and held according to the 23 factorial design. The regression equations describing the influence of the squeeze pressure, the mould temperature, and the quantity of strontium modifier on the strength and elongation of the examined alloy were obtained. It was found that the main factor controlling the strength increase is the squeeze pressure, while the plasticity (A5) of the alloy is affected most advantageously by modification. The application of modification treatment in squeeze casting technology enables for production of the slab-type castings made of AlSi7Mg alloy exhibiting strength at the level of 230 MPa and elongation exceeding 14%.
Źródło:
Archives of Foundry Engineering; 2013, 13, 2; 113-116
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling of the Dendritic Crystallization by the Cellular Automaton Method
Autorzy:
Zyska, A.
Konopka, Z.
Łągiewka, M.
Nadolski, M.
Powiązania:
https://bibliotekanauki.pl/articles/381219.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
binary alloys
crystallization
numerical modelling
cellular automata
structure modeling
stop dwuskładnikowy
krystalizacja
modelowanie numeryczne
metoda automatów komórkowych
Opis:
A numerical model of binary alloy crystallization, based on the cellular automaton technique, is presented. The model allows to follow the crystallization front movement and to generate the images of evolution of the dendritic structures during the solidification of a binary alloy. The mathematic description of the model takes into account the proceeding thermal, diffusive, and surface phenomena. There are presented the results of numerical simulations concerning the multi-dendritic growth of solid phase along with the accompanying changes in the alloying element concentration field during the solidification of Al + 5% wt. Mg alloy. The model structure of the solidified casting was achieved and compared with the actual structure of a die casting. The dendrite interaction was studied with respect to its influence on the generation and growth of the primary and secondary dendrite arms and on the evolution of solute segregation both in the liquid and in the solid state during the crystallization of the examined alloy. The morphology of a single, free-growing dendritic crystal was also modelled. The performed investigations and analyses allowed to state e.g. that the developed numerical model correctly describes the actual evolution of the dendritic structure under the non-equilibrium conditions and provides for obtaining the qualitatively correct results of simulation of the crystallization process.
Źródło:
Archives of Foundry Engineering; 2016, 16, 1; 99-106
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Correlations Between Arrangement of Reinforcing Particles and Mechanical Properties in Pressure Die Cast AlSi11-SiC Composites
Autorzy:
Konopka, Z.
Pasieka, A.
Łągiewka, M.
Nadolski, M.
Zyska, A.
Powiązania:
https://bibliotekanauki.pl/articles/380134.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
pressure die casting
metal matrix composites (MMCs)
aluminium alloys
structure
mechanical properties
odlewnictwo ciśnieniowe
kompozyty metalowe (MMC)
stopy aluminium
struktura
właściwości mechaniczne
Opis:
The work presents the investigation results concerning the structure of composite pressure die castings with AlSi11 alloy matrix reinforced with SiC particles. Examination has been held for composites containing 10 and 20 volume percent of SiC particles. The arrangement of the reinforcing particles within the matrix has been qualitatively assessed in specimens cut out of the castings. The index of distribution was determined on the basis of particle count in elementary measuring fields. The tensile strength, the yield point and elongation of the obtained composite were measured. Composite castings were produced at various values of the piston velocity in the second stage of injection, diverse intensification pressure values, and various injection gate width values. The regression equation describing the change of the considered arrangement particles index and mechanical properties were found as a function of the pressure die casting parameters. The infuence of particle arrangement in composite matrix on mechanical properties these material was examined and the functions of correlations between values were obtained. The conclusion gives the analysis and the interpretation of the obtained results.
Źródło:
Archives of Foundry Engineering; 2014, 14, 2; 31-36
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The assessment of bell casting producibility based on computer simulation of pouring and solidification
Autorzy:
Nadolski, M.
Zyska, A.
Konopka, Z.
Łągiewka, M.
Karolczyk, J.
Powiązania:
https://bibliotekanauki.pl/articles/381931.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
bell casting
artistic casting
computer simulation
odlewanie dzwonu
odlewnictwo artystyczne
symulacja komputerowa
Opis:
The work estimates the possibility of modification of the traditional production method of bell castings taking into account calculations performed by NovaFlow&Solid simulation program. Changes are evaluated with regard to the arrangement of the shrinkage defects in castings, which are of influence on the acoustic and mechanical properties of castings.
Źródło:
Archives of Foundry Engineering; 2011, 11, 3 spec.; 141-144
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
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