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Wyszukujesz frazę "lost" wg kryterium: Temat


Wyświetlanie 1-12 z 12
Tytuł:
Prototype Stand for Determining Quantities of Gasification Products of Polystyrene Model
Autorzy:
Jureczko, Michał
Bartocha, D.
Powiązania:
https://bibliotekanauki.pl/articles/2079785.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
lost foam
full mold
polystyrene model
research stand
technologia lost foam
pełna forma
model polistyrenowy
stanowisko badawcze
Opis:
Disposable foundry models constitute an increasingly important role in a unitary large-size foundry. These models have many benefits, but technologies using such materials require an understanding of degradation kinetics at the time of filling. The studies presented in the article determine the size of the polystyrene combustion products used for disposable foundry models. The results were obtained by carrying out the combustion process of the polystyrene model in a special combustion chamber, in different configurations. The pressures generated during thermal degradation vary depending on process parameters such as model density or the use of an additional adhesive binder. The results of laboratory tests may suggest what values of pressure are generated when filling in full-mold and lost foam technologies. The studies provide a prelude to further analysis of materials used for disposable foundry models and quantitative evaluation of their thermal degradation products for computer simulation.
Źródło:
Archives of Foundry Engineering; 2021, 21, 4; 15-20
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Test bench for analyzing the lost foam process
Autorzy:
Kaczorowski, R.
Just, P.
Pacyniak, T.
Powiązania:
https://bibliotekanauki.pl/articles/383347.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
casting
lost foam
styrofoam patterns
odlewanie
tracona piana
wzorzec styropianowy
Opis:
The current work presents and describes the test bench for analyzing the lost foam process, especially measuring of the pressure of gases in the gas gap and continuous measuring of the rate of rise of the bath level when pouring the liquid metal into the mould. A series of preliminary research was carried out on the bench which was aimed at determining the influence of the basic parameters of the process, i.e. the density of the styrofoam pattern, thickness of the refractory coating applied on the pattern, kind of the alloy and the temperature of pouring on the mould cavity by the liquid metal and the pressure of gases in the gas gap.
Źródło:
Archives of Foundry Engineering; 2013, 13, 1; 57-62
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Research of Properties of Experimental Ceramic Layers
Badanie właściwości doświadczalnych warstw ceramicznych
Autorzy:
Karwiński, A.
Żółkiewicz, Z.
Powiązania:
https://bibliotekanauki.pl/articles/352443.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
evaporative patterns
lost foam
ceramic layer
properties
wytwarzanie odlewów
warstwy ceramiczne
właściwości
Opis:
In the evaporative pattern casting process, the surface of a polystyrene pattern (Styrofoam) is coated with a ceramic layer. This ceramic layer, which coats the evaporative pattern, should have specific physiochemical properties including: resistance to thermal, chemical, and erosive activity of molten metal and proper permeability for gases which are produced by the evaporative polystyrene pattern. The article presents the research results of properties of experimentally selected ceramic layers applied on a polystyrene pattern in the evaporative pattern casting process.
W procesie wytwarzania odlewów wg metody modeli zgazowywanych na modele polistyrenowe (styropianowe), nakładana jest warstwa pokrycia ceramicznego. Pokrycie ceramiczne, które jest nanoszone na model zgazowywany powinno charakteryzować się określonymi| właściwościami fizykochemicznymi w tym: odpornością na termiczne, chemiczne i erozyjne działanie ciekłego metalu oraz odpowiednią przepuszczalnością gazów wytworzonych z zgazowywanego modelu polistyrenowego. W artykule przedstawiono wyniki badań własności, wytypowanych doświadczalnych powłok ceramicznych, nanoszonych na model polistyrenowy w procesie modeli zgazowywanych.
Źródło:
Archives of Metallurgy and Materials; 2014, 59, 2; 703-705
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The analysis of the influence of the polystyrene patterns shaping parameters on the resistance properties
Autorzy:
Pacyniak, T.
Buczkowska, K.
Bogus, W.
Powiązania:
https://bibliotekanauki.pl/articles/382906.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
odlewnictwo
tracona piana
styropianowy model odlewniczy
odlew
foundry
lost foam
polystyrene patterns
casts
Opis:
This work presents the technology of making foam plastics patterns used in casting as well as the final shaping stand. The analysis of the sintering process was carried out aiming at determining the influence of the pressure and the time of sintering on the flexural strength properties. The analysis of the research results confirmed that when the sintering pressure grows to the value of Pa =1,7 bar the flexural strength also increases, when the pressure value is higher than that, the degradation of the material takes place and the strength properties decrease.
Źródło:
Archives of Foundry Engineering; 2012, 12, 2; 227-234
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of the basic styrofoam patterns final shaping parameters on the resistance properties
Autorzy:
Pacyniak, T.
Buczkowska, K.
Powiązania:
https://bibliotekanauki.pl/articles/380452.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
odlewnictwo
tracona piana
styropianowy model odlewniczy
odlew
foundry
lost foam
polystyrene patterns
casts
Opis:
This work presents the analysis of the final shaping process of the patterns aimed at determining the influence of the pressure and the time of sintering on the resistance to bending. The analysis of the research results proved that when the pressure of the sintering rises and reaches Ps=2.1 bar the resistance to bending increases, above this level of the pressure the resistance value starts decreasing. The time of styrofoam sintering at which the highest bending resistance values were obtained is ts=90 s. When the sintering pressure is less than 2 bar prolongation of the time of sintering over 90 s causes a slight increase in the resistance, however, at higher pressures prolongation of the time of sintering causes submelting of the styrofoam pattern.
Źródło:
Archives of Foundry Engineering; 2012, 12, 4; 121-126
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of ingate size on the lost foam casting process
Autorzy:
Pacyniak, T.
Kaczorowski, R.
Powiązania:
https://bibliotekanauki.pl/articles/382861.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
przemysł odlewniczy
tracona piana
powłoka ochronna
foundry engineering
lost foam
EPS models
protective coating
Opis:
The article presents analysis of the influence of ingate size on the Lost Foam casting process. In particular, analysis of simulation tests has been carried out to determine the ingate size influence on the rate of filling of the mould cavity, pressure in the gas gap and size of the gas gap. A specially prepared mathematical model of the process and an original calculation algorithm were used in simulation tests of full-mould casting. The tests have indicated that the increase of the ingate size results in the increase of filling rate and increase of pressure of gases in the gas gap. However, significant influence on mould cavity filling occurs only when the ingate size is less than [...]1 cm2.
Źródło:
Archives of Foundry Engineering; 2012, 12, 2; 171-174
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badanie właściwości filtracyjnych doświadczalnych warstw ceramicznych
Study of filtration characteristics of the experimental ceramic layers
Autorzy:
Żółkiewicz, Z.
Jankowski, W.
Powiązania:
https://bibliotekanauki.pl/articles/391838.pdf
Data publikacji:
2012
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Odlewnictwa
Tematy:
modele zgazowywane
lost foam
filtracja
przepuszczalność
wytrzymałość
warstwa ceramiczna
evaporative patterns
permeability
strength
ceramic layer
Opis:
Jednym z podstawowych parametrów decydującym o prawidłowym przebiegu procesu zgazowywania modelu - z równoczesnym zapełnianiem przez ciekły metal formy, są właściwości powłoki ceramicznej nanoszonej na model polistyrenowy. Do tych czynników zalicza się przepuszczalność i wytrzymałość mechaniczną oraz termiczną powłoki. W artykule przedstawiono opracowany przyrząd oraz wyniki badań właściwości filtracyjnych wytypowanych doświadczalnych powłok ceramicznych nanoszonych na model polistyrenowy w procesie modeli zgazowywanych.
One of the main parameters determining proper course of the pattern evaporation process, which takes place in parallel with pouring of the foundry mould with metal, are properties of the ceramic coating applied on a polystyrene pattern. These properties include the permeability and mechanical as well as thermal resistance of the coating. The paper presents the developed measuring apparatus and the results of experimental studies of selected properties of the ceramic coatings applied on a polystyrene pattern used in the lost foam process.
Źródło:
Prace Instytutu Odlewnictwa; 2012, 52, 2; 51-62
1899-2439
Pojawia się w:
Prace Instytutu Odlewnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of Microwave Heating of Protective Coatings Used in the Lost Foam Technology
Autorzy:
Opyd, B.
Granat, K.
Powiązania:
https://bibliotekanauki.pl/articles/382105.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
innovative foundry technology
microwave
protective coating
lost foam
innowacyjna technologia odlewnicza
mikrofale
powłoka ochronna
tracona piana
Opis:
Presented are results of a preliminary research on determining a possibility to use microwave radiation for drying casting protective coatings applied on patterns used in the lost foam technology. Taken were measurements of permittivity εr and loss factor tgδ at 2.45 GHz, as well as attempts were made of microwave drying of a protective coating based on aluminium silicates, applied on shapes of foamed polystyrene and rigid polymeric foam. Time and results of microwave drying were compared with the results obtained by drying at 50 °C by the traditional method commonly used for removing water from protective coatings. Analysis of the obtained drying kinetics curves demonstrated that selection of proper operation parameters of microwave equipment permits the drying time to be significantly shortened. Depending on kind of the pattern material, drying process of a protective coating runs in a different way, resulting in obtaining different quality of the dried coating.
Źródło:
Archives of Foundry Engineering; 2015, 15, 2; 65-70
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design of Proven Technology of Metal Foam and Porous Metal Casting Production
Autorzy:
Radkovský, F.
Merta, V.
Obzina, T.
Powiązania:
https://bibliotekanauki.pl/articles/1837822.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
casting
porous metal
metallic foam
heat exchanger
lost foam
odlew
metal porowaty
metal spieniony
wymiennik ciepła
Opis:
The article describes the design of a proven technology for the production of metal foam and porous metal by the foundry. Porous metal formed by infiltrating liquid metal into a mould cavity appears to be the fastest and most economical method. However, even here we cannot do without the right production parameters. Based on the research, the production process was optimised and subsequently a functional sample of metal foam with an irregular internal structure - a filter - was produced. The copper alloy filter was cast into a gypsum mould using an evaporable model. Furthermore, a functional sample of porous metal with a regular internal structure was produced - a heat exchanger. The aluminium alloy heat exchanger was cast into a green sand mould using preforms. Also, a porous metal casting with a regular internal structure was formed for use as an element in deformation zones. This aluminium alloy casting was made by the Lost Foam method. The aim is therefore to ensure the production of healthy castings, which would find use in the field of filtration of liquid metal or flue gases, in vehicles in the field of shock energy absorption and also in energy as a heat exchanger.
Źródło:
Archives of Foundry Engineering; 2021, 21, 1; 132-136
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Aging Time Effects of the Pre-expanded Polystyrene on the Patterns Mechanical Properties
Autorzy:
Buczkowska, K.
Pacyniak, T.
Powiązania:
https://bibliotekanauki.pl/articles/381049.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
innovative casting technology
Innovative casting material
foundry
lost foam
model of polystyrene
casting
innowacyjna technologia odlewnicza
innowacyjny materiał odlewniczy
tracona piana
polistyrenowy model odlewniczy
Opis:
The aging granulate is to activate the blowing agent during the manufacturing process to granulate models can re-expand and shape the model of well-sintered granules, smooth surface and a suitable mechanical strength. The article presents the results of studies which aim was to determine the optimum time for aging pre-foamed granules for pre-selected raw materials. The testing samples were shaped in an autoclave, with constant parameters sintering time and temperature. Samples were made at 30 minute intervals. Models have been subjected to flexural strength and hardness.
Źródło:
Archives of Foundry Engineering; 2015, 15, 1; 131-137
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of time and pressure of forming a pattern on mechanical properties
Autorzy:
Pacyniak, T.
Buczkowska, K.
Kaczorowski, R.
Powiązania:
https://bibliotekanauki.pl/articles/382163.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
innovative foundry technology
innovative foundry material
foundry engineering
lost foam
polystyrene pattern
innowacyjna technologia odlewnicza
innowacyjny materiał odlewniczy
przemysł odlewniczy
tracona piana
styropianowy model odlewniczy
Opis:
In this paper, the technology of forming patterns on a research station equipped with an autoclave A-600 of Polish company GROM is presented. This study was conducted to determine the influence of pressure and time of forming a pattern on the bending strength. Analysis of the results confirmed that bending strength increases with increasing the pressure. The time of forming a pattern has a similar effect.
Źródło:
Archives of Foundry Engineering; 2011, 11, 3 spec.; 151-156
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Feeding and Cooling and Time of Thermal Treatment of a Massive Bush Made of the Complex Aluminum Bronze Cast by the Lost Foam
Autorzy:
Just, P.
Pisarek, B. P.
Powiązania:
https://bibliotekanauki.pl/articles/380931.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
innovative materials
innovative casting technologies
lost foam
aluminium bronze
casting properties
riser head
steel internal chill
thermal treatment
nowoczesne materiały
innowacyjne technologie odlewnicze
właściwości odlewów
obróbka termiczna
Opis:
Small additions of Cr, Mo and W to aluminium-iron-nickel bronze are mostly located in phases &kappa i (i=II; III; IV),and next in phase &alpha (in the matrix) and phase γ2. They raise the temperature of the phase transformations in aluminium bronzes as well as the casts’ abrasive and adhesive wear resistance. The paper presents a selection of feeding elements and thermal treatment times which guarantees structure stability, for a cast of a massive bush working at an elevated temperature (650–750°C) made by means of the lost foam technology out of composite aluminium bronze. So far, there have been no analyses of the phenomena characteristic to the examined bronze which accompany the process of its solidification during gasification of the EPS pattern. There are also no guidelines for designing risers and steel internal chill for casts made of this bronze. The work identifies the type and location of the existing defects in the mould’s cast. It also proposes a solution to the manner of its feeding and cooling which compensates the significant volume contraction of bronze and effectively removes the formed gases from the area of mould solidification. Another important aspect of the performed research was establishing the duration time of bronze annealing at the temperature of 750°C which guarantees stabilization of the changes in the bronze microstructure – stabilization of the changes in the bronze HB hardness.
Źródło:
Archives of Foundry Engineering; 2014, 14, 4; 39-44
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-12 z 12

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