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Wyszukujesz frazę "gas porosity" wg kryterium: Temat


Wyświetlanie 1-4 z 4
Tytuł:
Contribution to the Assessment of the Data Acquisition Effectiveness in the Aspect of Gas Porosity Defects Prediction in Ductile Cast Iron Castings
Autorzy:
Ignaszak, Z.
Sika, R.
Rogalewicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/381804.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
foundry processes
information technology
gas porosity
data acquisition
procesy odlewnicze
technologie informatyczne
porowatość gazowa
akwizycja danych
Opis:
The article presents an example of analysis of the influence of selected parameters deriving from data acquisition in foundries on the occurrence of Gas porosity defects (detected by Visual testing) in castings of ductile cast iron. The possibilities as well as related effectiveness of prediction of this kind of defects were assessed. The need to rationally limit the number of possible parameters affecting this kind of porosity was indicated. Authors also benefited from expert group's expertise in evaluating possible causes associated with the creation of the aforementioned defect. A ranking of these parameters was created and their impact on the occurrence of the defect was determined. The classic statistical tools were used. The possibility of unexpected links between parameters in case of uncritical use of these typical statistical tools was indicated. It was emphasized also that the acquisition realized in production conditions must be subject to a specific procedure ordering chronology and frequency of data measurements as well improving the casting quality control. Failure to meet these conditions will significantly affect the difficulties in implementing and correcting analysis results, from which INput/OUTput data is expected to be the basis for modelling for quality control.
Źródło:
Archives of Foundry Engineering; 2018, 18, 1; 35-40
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Defects on Deformation Behavior of High-Pressure Die-Casting Magnesium Alloys
Autorzy:
Braszczyńska-Malik, Katarzyna
Powiązania:
https://bibliotekanauki.pl/articles/27314146.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
magnesium alloy
high-pressure die casting
gas porosity
shrinkage porosity
microstructure
deformations
stop magnezu
odlewanie wysokociśnieniowe
porowatość gazowa
porowatość skurczowa
mikrostruktura
deformacje
Opis:
The results of investigations of defects in AME-series magnesium alloys produced by the high-pressure die-casting method are presented. The analyzed magnesium alloys contain about 5 wt% aluminum and 1-5 wt% rare earth elements introduced in the form of mischmetal. The casts were fabricated using a regular type cold-chamber high-pressure die-casting machine with a 3.2 MN locking force. The same surfaces of the casts were analyzed before and after the three-point bending test in order to determine the influence of the gas and shrinkage porosity on the deformation behavior of the alloys. The obtained results revealed that the most dangerous for the cast elements is the shrinkage porosity, especially stretched in the direction perpendicular to the that of the tensile stress action. Additionally, the influence (Mg) solid solution and its interaction on the cracking process was described [alpha] of deformation twins arise in the dendrites of the primary.
Źródło:
Archives of Foundry Engineering; 2023, 23, 2; 10--14
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Contribution to the Identification of Porosity Type in AlSiCu High-Pressure-Die-Castings by Experimental and Virtual Way
Autorzy:
Ignaszak, Z.
Hajkowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/379466.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Al-Si alloy
gravity
high pressure
die casting
microstructure
gas porosity
shrinkage porosity
virtualization process
complementary model validation
stop Al-Si
odlewanie ciśnieniowe
porowatość gazowa
wirtualizacja
walidacja modelu
Opis:
The paper concerns the problem of discontinuity in high pressure die castings (HPDC). The compactness of their structure is not perfect, as it is sometimes believed. The discontinuities present in these castings are the porosity as follow: shrinkage and gas (hydrogen and gas-air occlusions) origin. The mixed gas and shrinkage nature of porosity makes it difficult to identify and indicate the dominant source. The selected parameters of metallurgical quality of AlSi9Cu3 alloy before and after refining and the gravity castings samples (as DI - density index method), were tested and evaluated. This alloy was served to cast the test casting by HPDC method. The penetrating testing (PT) and metallographic study of both kinds of castings were realized. The application of the NF&S simulation system allowed virtually to indicate the porosity zones at risk of a particular type in gravity and high-pressure-die-castings. The comparing of these results with the experiment allowed to conclude about NF&S models validation. The validity of hypotheses concerning the mechanisms of formation and development of porosity in HPDC casting were also analyzed.
Źródło:
Archives of Foundry Engineering; 2015, 15, 1; 143-151
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ rodzaju, grubości pokrycia ceramicznego oraz gęstości zespołu modelowego na stopień zagazowania odlewu
The Effect of the Type, the Ceramic Coating Thickness and the Pattern Set Density on the Degree of Gas Porosity in Casting
Autorzy:
Buczkowska, K.
Just, P.
Świniarska, J.
Pacyniak, T.
Powiązania:
https://bibliotekanauki.pl/articles/382587.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
innowacyjny materiał odlewniczy
innowacyjna technologia odlewnicza
tracona piana
pokrycie ceramiczne
pokrycie ogniotrwałe
spienione tworzywo wielkocząsteczkowe
zagazowanie odlewu
innovative foundry material
innovative foundry technology
lost foam process
ceramic coating
gas porosity
Opis:
W pracy poruszone zostały zagadnienia związane z technologią lost foam. Zbadano wpływ rodzaju oraz grubości pokrycia ceramicznego a także gęstości zespołu modelowego na stopień zagazowania odlewu. Badania przeprowadzono dla dwóch rodzajów pokryć ceramicznych Disopast 4805/3 oraz Disopast 7759, które nakładano na modele ze spienionego polistyrenu w jednej, dwóch i trzech warstwach. Tak przygotowane modele wykorzystano do wytworzenia odlewów ze stopu AlSi11 w technologii lost foam. Otrzymane odlewy zbadano pod kątem stopnia ich zagazowania. Zaprezentowane badania wykazały zależności pomiędzy gęstością modelu, rodzajem i grubością zastosowanych powłok ceramicznych, a stopieniem zagazowania odlewów. Wykazano, że badane właściwości mają istotny wpływ na stopień zagazowania odlewu, jego porowatość oraz liczbę gazową. Poprzez odpowiedni dobór pokrycia, jego grubości, gęstości modelu, możliwe jest zminimalizowanie stopnia zagazowania odlewu.
The study addressed the issues associated with lost foam casting technology. The effect of the type and thickness of the ceramic coating and the density of the pattern set of the degree of gas porosity in casting. The study was conducted for two types of ceramic coatings Disopast 4805/3 and Disopast 7759, which was applied to patterns with expanded polystyrene in one, two and three layers. Thus prepared patterns were used to produce castings alloy AlSi11 lost foam technology. The resulting castings were tested for their level of gas porosity. Presented studies have shown the relationship between the density of the polystyrene pattern, type and thickness of the applied ceramic coatings gas porosity and casting melt. It has been shown that investigated the properties have a significant impact on the degree of gas porosity in cast, its porosity and the gaseous number. Through an appropriate choice of coating, its thickness, density model, it is possible to minimize the degree of gassing casting.
Źródło:
Archives of Foundry Engineering; 2015, 15, 2 spec.; 7-12
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-4 z 4

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