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Tytuł:
Applying Rough Set Theory for the Modeling of Austempered Ductile Iron Properties
Autorzy:
Kochański, A.
Soroczyński, A.
Kozłowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/382215.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
data mining
knowledge rules
rough set theory
casting
pozyskiwanie danych
reguły wiedzy
teoria zbiorów przybliżonych
odlewnictwo
Opis:
The article discusses the possibilities of employing an algorithm based on the Rough Set Theory for generating engineering knowledge in the form of logic rules. The logic rules were generated from the data set characterizing the influence of process parameters on the ultimate tensile strength of austempered ductile iron. The paper assesses the obtained logic rules with the help of the rule quality evaluation measures, that is, with the help of the measures of confidence, support, and coverage, as well as the proposed rule quality coefficient.
Źródło:
Archives of Foundry Engineering; 2013, 13, 2 spec.; 70-73
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of Critical Parameters for Sand Inclusion Defect in FNB Casting
Autorzy:
Acharya, S. G.
Vadher, J. A.
Kothari, K. D.
Powiązania:
https://bibliotekanauki.pl/articles/381036.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
casting
evaluation of parameters
furan
grain fineness number
loss of ignition
pH
odlewnictwo
ocena parametrów
ziarno
Opis:
Casting covers major area of production all over the world. Resin bonded casting is widely used in today’s manufacturing industries. Furan No bake casting is most widely accepted in Indian foundries due to its excellent surface finish and dimensional stability. It is a self-setting binder and it has a lower work and strip times. Though the casting process is also known as process of uncertainty, in the present study, an attempt has been made to investigate the effect of Grain Fineness Number, Loss of Ignition, Potential of Hydrogen, % of Resin with respect to sand, Sand Temperature and Compressive strength of the mould on Sand Inclusion defect – one of the most dominating defect in the Krislur Castomech Pvt. Ltd. Industry situated at Bhavnagar, Gujarat, India. The experiments were conducted based on response surface methodology (RSM) and sequential approach using face centered central composite design. The results show that quadratic model with removal of some insignificant term is comparatively best fits for Sand Inclusion Defect.
Źródło:
Archives of Foundry Engineering; 2017, 17, 1; 5-12
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of a liquid metal temperature on a thermal decomposition of a phenolic resin
Autorzy:
Holtzer, M.
Bobrowski, A.
Dańko, R.
Żymankowska-Kumon, S.
Kolczyk, J.
Powiązania:
https://bibliotekanauki.pl/articles/382247.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
environment protection
phenolic resin
BTEX compounds
alluminium
foundry
ochrona środowiska
żywica fenolowa
związki typu BTEX
aluminium
odlewnictwo
Opis:
Due to the presence of harmful substances in resins those mould sands may be hazardous to the natural environment and workers. The general assessment of harmfulness of sands used for molds and cores encompasses 2 basic points: emission of hazardous substances during processes of preparing sands, pouring mold with liquid metals (high temperatures), cooling and shaking-out; possibility of washing out hazardous substances from used sands to the environment, during storage or economic use outside foundries. We present the results of research on the emission of BTEX compounds from mould sands with phenolic resins during pouring liquid metal of different temperature (cast iron and Al alloy). The research was conducted according to the original method prepared by the authors, which has been used for years in cooperation with various foundries (Poland, abroad).
Źródło:
Archives of Foundry Engineering; 2013, 13, 2; 35-38
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Sand Wetting on Physically Hardened Moulding Sands Containing a Selected Inorganic Binder. Part 2
Autorzy:
Stachowicz, M.
Granat, K.
Pałyga, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/379478.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
foundry engineering
microwaves
hardening
moulding sand
inorganic binder
strength
odlewnictwo
mikrofale
hartowanie
masa formierska
spoiwo nieorganiczne
wytrzymałość
Opis:
In the paper, an attempt is made to explain the previously observed increased effectiveness of utilising hydrated sodium water-glass grade 137 after hardening moulding sands with selected physical methods. In the modified process of preparing sandmixes, during stirring components, water as a wetting additive was introduced to the sand-binder system. Presented are examination results of influence of faster microwave heating and slower traditional drying of the so-prepared moulding sands on their tensile and bending strength, calculated per weight fraction of the binder. The measurement results were confronted with SEM observations of linking bridges and with chemical analyses of grain surfaces of high-silica base. On the grounds of comprehensive evaluation of hardened moulding sands, positive effects were found of the applied physical process of binder dehydration and presence of the wetting additive. It was observed that introduction of this additive during stirring, before adding the binder, improves flowing the binder to the places where durable linking bridges are created. It was also found that the applied methods of hardening by dehydration enable creation of very durable linking bridges, strongly connected with the sand base, which results in damages of high-silica grain surfaces, when the bridges are destroyed.
Źródło:
Archives of Foundry Engineering; 2016, 16, 1; 79-84
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mechanical Properties of Magnesium Die Castings Produced Utilizing Process Scrap
Autorzy:
Fajkiel, A.
Dudek, P.
Reguła, T.
Powiązania:
https://bibliotekanauki.pl/articles/380871.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
magnesium alloys
mechanical properties
recycling
high pressure die casting (HPDC)
stopy magnezu
właściwości mechaniczne
recykling
odlewnictwo wysokociśnieniowe
Opis:
Magnesium alloys are one of the lightest of all the structural materials. Because of their excellent physical and mechanical properties the alloys have been used more and more often in various branches of industry. They are cast mainly (over 90%) on cold and hot chamber die casting machines. One of the byproducts of casting processes is process scrap which amounts to about 40 to 60% of the total weight of a casting. The process scrap incorporates all the elements of gating systems and fault castings. Proper management of the process scrap is one of the necessities in term of economic and environmental aspects. Most foundries use the process scrap, which involves adding it to a melting furnace, in a haphazard way, without any control of its content in the melt. It can lead to many disadvantageous effects, e.g. the formation of a hard buildup at the bottom of the crucible, which in time makes casting impossible due to the loss of the alloy rheological properties. The research was undertaken to determine the effect of an addition of the process scrap on the mechanical properties of AZ91 and AM50 alloys. It has been ascertained that the addition of a specific amount of process scrap to the melt increases the mechanical properties of the elements cast from AZ91 and AM50 alloys. The increase in the mechanical properties is caused mainly by compounds which can work as nuclei of crystallization and are introduced into the scrap from lubricants and anti-adhesive agents. Furthermore carbon, which was detected in the process scrap by means of SEM examination, is a potent grain modifier in Mg alloys [1-3]. The optimal addition of the process scrap to the melt was determined based on the statistical analysis of the results of studies of the effect of different process scrap additions on the mean grain size and mechanical properties of the cast parts.
Źródło:
Archives of Foundry Engineering; 2014, 14, 4; 31-34
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Computer Catalog and Semantic Search of Data in the Domain of Cast Iron Processing
Autorzy:
Rojek, G.
Regulski, K.
Wilk-Kołodziejczyk, D.
Kluska-Nawarecka, S.
Wawrzaszek, T.
Powiązania:
https://bibliotekanauki.pl/articles/381770.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
application of information technologies
foundry
semantic search
ontology
cast iron processing
zastosowanie technologii informacyjnych
odlewnictwo
obróbka żeliwa
Opis:
The aim of this study is to design and implement a computer system, which will allow the semantic cataloging and data retrieval in the field of cast iron processing. The intention is to let the system architecture allow for consideration of data on various processing techniques based on the information available or searched by a potential user. This is achieved by separating the system code from the knowledge of the processing operations or from the chemical composition of the material being processed. This is made possible by the creation and subsequent use of formal knowledge representation in the form of ontology. So, any use of the system is associated with the use of ontologies, either as an aid for the cataloging of new data, or as an indication of restrictions imposed on the data which draw user attention. The use of formal knowledge representation also allows consideration of semantic meaning, a consequence of which may be, for example, returning all elements in subclasses of the searched process class or material grade.
Źródło:
Archives of Foundry Engineering; 2017, 17, 2; 79-84
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Archaeometallurgical Investigations of the Early Iron Age Casting Workshop at Kamieniec. A Preliminary Study
Autorzy:
Garbacz-Klempka, A.
Kowalski, Ł.
Kozana, J.
Gackowski, J.
Perek-Nowak, M.
Szczepańska, G.
Piękoś, M.
Powiązania:
https://bibliotekanauki.pl/articles/383062.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
non-destructive testing
investment casting
X-ray fluorescence spectroscopy
archaeometallurgy
Lusatian culture
badania nieniszczące
odlewnictwo
promieniowanie rentgenowskie
kultura łużycka
Opis:
(Chełmno land, Poland) as it is reflected through casting workshop recovered during recent excavations. Among ready products, the ones giving evidence of local metallurgy (e.g. casting moulds and main runners) were also identified. With the shrinkage cavities and dendritic microstructures revealed, the artifacts prove the implementing a casting method by the Lusatian culture metalworkers. The elemental composition indicates application of two main types of bronzes: Cu-Sn and Cu-Pb. Aside these main alloying additions, some natural impurities such as silver, arsenic, antimony and nickel were found which may be attributed to the origin of the ore and casting technology. The collection from Kamieniec was described in terms of its structure and composition. The investigations were made by means of the energy dispersive X-ray fluorescence spectroscopy (ED-XRF), scanning electron microscopy (SEM) coupled with an energy dispersive X-ray analysis system (EDS) and optical microscopy (OM). In order to fingerprint either local or non-local profile of the alloys, the ED-XRF data-set was statistically evaluated using a factor analysis (FA).
Źródło:
Archives of Foundry Engineering; 2016, 16, 3; 29-34
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Metallographic Characterization of Metal Artifacts Based on Late Medieval Examples
Autorzy:
Garbacz-Klempka, A.
Kwak, Z.
Perek-Nowak, M.
Starski, M.
Powiązania:
https://bibliotekanauki.pl/articles/382140.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
nondestructive testing
copper alloy
brasses
casting
X-ray fluorescence
SEM-EDS
badania nieniszczące
stop miedzi
mosiądz
odlewnictwo
fluorescencja rentgenowska
Opis:
This work presents the metallographical observations of the chosen copper objects from the Late Middle Ages. Part of these studies is the analysis of metal relics from the Puck area conducted at the Faculty of Foundry, AGH-UST, in collaboration with the University of Warsaw. Medieval European cities were centers of trade and production of metal artifacts. Also in the Puck area, the manufacturing activities can be confirmed based on the metal findings. The aim of this study was to identify and systematize copper alloys used in the Late Medieval Period, on the basis of historic artifacts from Puck. The chemical composition analysis and microstructure observation were carried out. The research is at the first stage of an experiment of reconstructing the medieval alloys in order to study deeper their properties.
Źródło:
Archives of Foundry Engineering; 2015, 15, 4 spec.; 29-34
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Automatic Core Shooting Parameters in Hot-Box Technology on the Strength of Sodium Silicate Olivine Moulding Sands
Autorzy:
Stachowicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/382292.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
foundry
sodium silicate
olivine sand
hot-box process
core shooting
odlewnictwo
krzemian sodu
piasek oliwinowy
proces hot-box
rdzeń
Opis:
The paper presents the results of preliminary research on the application of olivine moulding sands with hydrated sodium silicate containing 1.5 % wt. of binder to perform ecological casting cores in hot-box technology using a semi-automatic core shooter. The following parameters were used in the process of core shooting: initial shot pressure of 6 bar, shot time 3 s, the temperature of the core-box: 200, 250 and 300°C and the core curing time: 30, 60, 90, 120 and 150 s. The matrix of the moulding mixture was olivine sand, and the binder of the sandmix was commercial, unmodified hydrated sodium silicate with molar module SiO2/Na2O of 2.5. In one shot of the automatic core-shooter were formed three longitudinal specimens (cores) with a dimensions 22.2×22.2×180 mm. The samples obtained in this way were subjected to the assessment of the influence of the shooting parameters, i.e. shooting time, temperature and curing time in core-box, using the following criteria: core box fill rate, mechanical strength to bending RgU, apparent density, compaction degree and susceptibility to friability of sand grains after hardening. The results of trials on the use of olivine moulding sands with hydrated sodium silicate (olivine SSBS) in the process of core shooting made it possible to determine the conditions for further research on the improvement of inorganic hot-box process technology aimed at: reduction of the heating temperature and the curing time. It was found that correlation between the parameters of the shooting process and the bending strength of olivine moulding sands with sodium silicate is observed.
Źródło:
Archives of Foundry Engineering; 2020, 20, 1; 67-72
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Copper and Arsenical Copper During Eneolithic in Metallographic and Mechanical Properties Examination
Autorzy:
Garbacz-Klempka, A.
Kozana, J.
Piękoś, M.
Cieślak, W.
Perek-Nowak, M.
Kowalski, Ł.
Adamczak, K.
Łoś, J.
Powiązania:
https://bibliotekanauki.pl/articles/382382.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
nondestructive testing
copper
arsenical copper
archaeometallurgy
casting
metallographic properties
Eneolith
badania nieniszczące
miedź
archeometalurgia
odlewnictwo
właściwości metalograficzne
epoka miedzi
Opis:
Arsenical copper has been used since 5th millennium cal.BC, later exchanged by application of Cu-Sn alloys in metallurgy. This work presents the results of metallographic and mechanical properties studies performed on two flat axes connected with local Eneolithic societies (4500-3000 cal.BC). The axes are one of the oldest metal artifacts from Polish land. Originally they were made from Cu-As alloy, and their chemical composition was established by X-ray fluorescence spectroscopy (XRF). Their microstructure was analysed using optical microscopy (OM) and scanning electron microscopy conducted with energy-dispersive X-ray spectroscopy (SEM-EDS). The macrostructure analysis (OM) of the axes was performed as well. On the basis of the results, the alloys used in the Eneolithic to cast the axes were reproduced in lab. In order to achieve the characteristics of the alloys, their mechanical properties including ultimate tensile strenght (UTS), hardness (HB), microhardness (HV0,1) and ductility were examined. The solidification process was studied by means of thermal analysis.
Źródło:
Archives of Foundry Engineering; 2015, 15, 4 spec.; 23-28
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Temperature on Chromite-Based Moulding Sands Bonded with Sodium Silicate
Autorzy:
Stachowicz, M.
Kamiński, M.
Granat, K.
Pałyga, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/382605.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
foundry engineering
chromite sand
moulding sand
baking temperature
sodium silicate
odlewnictwo
piasek formierski
masa formierska
temperatura zapiekania
krzemian sodu
Opis:
In the paper, a research on effects of baking temperature on chromite sand base of moulding sands bonded with sodium silicate is presented. Pure chromite sand and its chromite-based moulding sand prepared with use of sodium silicate were subjected to heating within 100 to 1200 °C. After cooling-down, changes of base grains under thermal action were determined. Chromite moulding sand was prepared with use of 0.5 wt% of domestic made, unmodified sodium silicate (water-glass) grade 145. After baking at elevated temperatures, creation of rough layer was observed on grain surfaces, of both pure chromite sand and that used as base of a moulding sand. Changes of sand grains were evaluated by scanning microscopy and EDS analyses. It was found that changes on grain surfaces are of laminar nature. The observed layer is composed of iron oxide (II) that is one of main structural components of chromite sand. In order to identify changes in internal structure of chromite sand grains, polished sections were prepared of moulding sand hardened with microwaves and baked at elevated temperatures. Microscopic observations revealed changes in grains structure in form of characteristically crystallised acicular particles with limited magnesium content, intersecting at various angles. EDS analysis showed that these particles are composed mostly of chromium oxide (III) and iron oxide (II). The temperature above that the a.m. changes are observed in both chromite-based moulding sand and in pure chromite sand. The observed phenomena were linked with hardness values and mass of this sand.
Źródło:
Archives of Foundry Engineering; 2016, 16, 4; 147-152
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Temperature on Chromite-Based Moulding Sands Bonded with Sodium Silicate
Autorzy:
Stachowicz, M.
Kamiński, M.
Granat, K.
Pałyga, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/381070.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
foundry engineering
chromite sand
moulding sand
baking temperature
sodium silicate
odlewnictwo
piasek formierski
masa formierska
temperatura zapiekania
krzemian sodu
Opis:
In the paper, a research on effects of baking temperature on chromite sand base of moulding sands bonded with sodium silicate is presented. Pure chromite sand and its chromite-based moulding sand prepared with use of sodium silicate were subjected to heating within 100 to 1200°C. After cooling-down, changes of base grains under thermal action were determined. Chromite moulding sand was prepared with use of 0.5 wt% of domestic made, unmodified sodium silicate (water-glass) grade 145. After baking at elevated temperatures, creation of rough layer was observed on grain surfaces, of both pure chromite sand and that used as base of a moulding sand. Changes of sand grains were evaluated by scanning microscopy and EDS analyses. It was found that changes on grain surfaces are of laminar nature. The observed layer is composed of iron oxide (II) that is one of main structural components of chromite sand. In order to identify changes in internal structure of chromite sand grains, polished sections were prepared of moulding sand hardened with microwaves and baked at elevated temperatures. Microscopic observations revealed changes in grains structure in form of characteristically crystallised acicular particles with limited magnesium content, intersecting at various angles. EDS analysis showed that these particles are composed mostly of chromium oxide (III) and iron oxide (II). The temperature above that the a.m. changes are observed in both chromite-based moulding sand and in pure chromite sand. The observed phenomena were linked with hardness values and mass of this sand.
Źródło:
Archives of Foundry Engineering; 2017, 17, 2; 95-100
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of the Selected Factors on Thermal Fatigue of the ADI in an Aspect of its Suitability as the Material for Metal Moulds
Wpływ wybranych czynników na zmęczenie cieplne żeliwa ADI w aspekcie jego przydatnosci jako materiału na formy metalowe
Autorzy:
Zych, J.
Wróbel, J.
Powiązania:
https://bibliotekanauki.pl/articles/356751.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
ductile iron
ADI
thermal fatigue
metal moulds
pressure die casting
żeliwo
żeliwo ADI
zmęczenie cieplne
forma metalowa
odlewnictwo ciśnieniowe
Opis:
The investigation results of the thermal fatigue resistance of two ADI grades (EN-GJS-1200-2 and EN-GJS-800-8) are presented in the paper. Tests were performed on the author’s research stand, by means of the resistance heating of samples acc. L.F. Coffin method. The thermal fatigue resistance is the basic criterion in assessing the material suitability for metal moulds. The maximal temperature (Tmax) of thermal cycles influence on their number, which the sample can withstand before cracking, were estimated. Structure transformations, hardness and strength changes of the austempered ductile iron (ADI) were analysed. It was found, that at cyclic heating to Tmax <500°C, the ADI retains its primary ausferritic structure, even after more than 10.000 thermal cycles. Such ADI behaviour predisposes it to be applied as a material for metal moulds used in the pressure die casting, it means mainly at casting Mg and Zn alloys as well as for small castings of Al alloys.
W pracy przedstawiono wyniki badań odporności na zmęczenie cieplne dwóch gatunków żeliwa ADI (EN-GJS-1200-2 i EN-GJS-800-8). Badania prowadzono na autorskim stanowisku badawczym stosując oporowe nagrzewanie próbek, wg metody L.F. Cottina. Odporność na zmęczenie cieplne jest podstawowym kryterium w ocenie przydatności tworzywa (materiału) na formy metalowe, które podlegają cyklicznemu nagrzewaniu. Oceniono wpływ maksymalnej temperatury (Tmax) cykli cieplnych na ich liczbę do pęknięcia próbki, analizowano zmiany struktury żeliwa ADI. zmiany twardości i wytrzymałości. Stwierdzono, iż przy cyklicznym nagrzewaniu do Tmax<500°C, żeliwo ADI zachowuje swoją pierwotną strukturę ausferrytu nawet po wykonaniu ponad 10.000 cykli cieplnych. Takie zachowanie żeliwa ADI predysponuje go jako materiał na formy metalowe stosowane w odlewnictwie ciśnieniowym, a więc przy odlewaniu głównie stopów Mg i Zn, ale również dla mniejszych odlewów wykonywanych ze stopów Al.
Źródło:
Archives of Metallurgy and Materials; 2014, 59, 2; 693-697
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of Dental Prostheses Cast and Sintered by SLM from Co-Cr-Mo-W Alloy
Autorzy:
Myszka, D.
Skrodzki, M.
Powiązania:
https://bibliotekanauki.pl/articles/380544.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
microstructure
dental prosthesis
precision investment casting
selective laser melting
dimensional accuracy
proteza zębowa
odlewnictwo precyzyjne
przetapianie laserowe selektywne
dokładność wymiarowa
Opis:
The article presents the results of a comparative analysis of the metal substructure for dental prosthesis made from a Co-Cr-Mo-W alloy by two techniques, i.e. precision investment casting and selective laser melting (SLM). It was found that the roughness of the raw surface of the SLM sinter is higher than the roughness of the cast surface, which is compensated by the process of blast cleaning during metal preparation for the application of a layer of porcelain. Castings have a dendritic structure, while SLM sinters are characterized by a compact, fine-grain microstructure of the hardness higher by about 100 HV units. High performance and high costs of implementation the SLM technology are the cause to use it for the purpose of many dental manufacturers under outsourcing rules. The result is a reduction in manufacturing costs of the product associated with dental work time necessary to scan, designing and treatment of sinter compared with the time needed to develop a substructure in wax, absorption in the refractory mass, casting, sand blasting and finishing. As a result of market competition and low cost of materials, sinter costs decrease which brings the total costs related to the construction unit making using the traditional method of casting, at far less commitment of time and greater predictability and consistent sinter quality.
Źródło:
Archives of Foundry Engineering; 2016, 16, 4; 201-207
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mediaeval Casts of the Eastern Reliquary Crosses
Autorzy:
Garbacz-Klempka, A.
Nosek, E. M.
Rzadkosz, S.
Powiązania:
https://bibliotekanauki.pl/articles/381176.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
nondestructive testing method
artistic casting
metal artefacts conservation
copper alloy
bronze
badanie nieniszczące
odlewnictwo artystyczne
konserwacja metalu
stop miedzi
brąz
Opis:
Non-destructive testing methods are widely applied for metal artefacts research. The analyses presented here are part of research and conservation program encompassing metal artefacts discovered during archaeological excavations in the years 2010–2011 in the area of Czermno. Among metal artefacts of archaeological origin there is an important group of objects connected with cult. Reliquary crosses called encolpions can be distinguished here; worn both by priests and by lay people in Central and Eastern Europe. They present an interesting group for historical and iconographic research, as well as for the analyses of the materials and the techniques applied. The type of cast encolpions were examined, found in the area of the old dwelling complex connected with fortified settlement of Czermno (the old Grody Czerwieńskie). These objects are initially dated to the 12th century. These metal artefacts are researched, by application of the non-destructive testing methods, at the Faculty of Foundry Engineering of the AGH University of Science and Technology in Kraków in cooperation with Maria Curie-Skłodowska University in Lublin, the Polish Academy of Sciences and the Rzeszów University. The research helped to enlarge the scientific scope of knowledge on Mediaeval materials and manufacturing techniques, while the conservation efforts gave back the proper artistic value to the artefacts from Czermno and allowed for the appropriate exhibition.
Źródło:
Archives of Foundry Engineering; 2013, 13, 1 spec.; 147-152
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modified Hot Distortion Test to Investigate the Effect of the Inorganic Binder on the High-Temperature Behaviour of Physically Hardened Moulding Sands
Autorzy:
Stachowicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/382822.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
foundry engineering
sodium silicate
bonded sand
thermal deformation
hot distortion test
microwave heating
odlewnictwo
krzemian sodu
piasek związany
odkształcanie termiczne
nagrzewanie mikrofalowe
Opis:
This study is an attempt to determine by Hot Distortion Test (HDT) the impact of physical methods of hardening inorganic binders in the moulding sands on phenomena caused by influence of thermal energy from heating elements with a temperature of 900°C +/- 10°C. Medium silica sand-based moulding mixtures were densified and then hardened using two physical methods: microwave heating at a frequency of 2.45 GHz or classical drying at a temperature of 110°C. Sodium silicate bonded sand (SSBS) with five unmodified kinds of hydrated sodium silicates subjected to two different types of hardening method were assessed in terms of their behaviour in high temperature. Thermal behaviour by means of deformation measurement was carried out with a modified Hot Distortion Test (mHDT). Due to this advanced, but unstable by appropriate standards Hot Distortion Test gives an opportunity to measure thermoplastic deformations (L) in moulding sands in many aspects, such as time of annealing. Research carried out in this way exposed differences between inorganic binders with molar module ranging from 3.4 to 2.0. It was established that deformations under the influence of high temperature last the longest in SSBS containing binders with molar module ranging from 3.4 to 2.9. Similarly, for these types of moulding sands the method of hardening the binder is found to be essential for increasing/decreasing the rate of thermoplastic deformations during the annealing of samples. The samples of SSBS made with binders with molar module from 2.5 to 2.0 are found to be excessively susceptible to thermoplastic deformation as a result of heating them in high environmental temperature presence.
Źródło:
Archives of Foundry Engineering; 2018, 18, 2; 45-50
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:
Computer modeling for the visualization and geometric reconstruction of artefacts from the casting workshop in Grzybiany
Modelowanie komputerowe do wizualizacji oraz rekonstrukcja geometryczna zabytków z pracowni odlewniczej Grzybiany
Autorzy:
Garbacz-Klempka, A.
Rzadkosz, S.
Stolarczyk, T.
Kozana, J.
Piekoś, M.
Kwak, Z.
Tenerowicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/264276.pdf
Data publikacji:
2015
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
archaeometallurgy
casting
lost wax method
bronze
computer modelling
3D visualization
archeometalurgia
odlewnictwo
metoda wytapianych modeli
brąz
modelowanie komputerowe
wizualizacje 3D
Opis:
The casting workshop in Grzybiany is one of the most important archaeological sites in regards to casting technology from the Bronze and Early Iron Ages. During the "Grzybiany. Osada nadjeziorna z epoki brązu i żelaza" [Grzybiany. Lakeside settlement from the Bronze and Early Iron Ages] research, the structure of casting moulds was analyzed as well as the chemical composition and microstructure of one of the more-interesting metal artefacts found within the workshop. Based on this, geometric visualization was performed with the help of computer-modeling methods. For scientific, experimental, and educational purposes, reconstruction of a zoomorphic pendant was performed using the lost-wax method. Wax models injected into a matrix were used, along with fired ceramic (gypsum) moulds and a specially prepared modeling alloy that corresponds to the original material. In this way, a true replica of the original was obtained: technologically, structurally and chemically. Studies of production technology of the casting workshop dated back to the Bronze and Early Iron Age help to increase the knowledge of the mould-preparing technology and the alloys used. Modern tools and computer programs aid in the research of old technologies and help disseminate the results.
Pracownia odlewnicza w Grzybianach należy do jednego z najważniejszych stanowisk archeologicznych pod względem studiów nad technologią odlewniczą w epoce brązu i wczesnej epoce żelaza. W toku prac wykonano analizę struktury form odlewniczych. Przeprowadzono także analizę składu chemicznego i mikrostruktury jednego z ciekawszych zabytków metalowych, odkrytych na terenie pracowni. Na tej podstawie, z wykorzystaniem metod modelowania komputerowego, wykonano wizualizację geometryczną. W celach naukowych, doświadczalnych i edukacyjnych wykonano rekonstrukcję zawieszki zoomorficznej przy wykorzystaniu metody wytapianych modeli. Zastosowano modele woskowe wtryskiwane do matrycy, formy ceramiczne (gipsowe) wypalane oraz specjalnie przygotowany stop modelowy, odpowiadający oryginalnemu. W ten sposób uzyskano wierną technologicznie, strukturalnie i chemicznie replikę zabytku. Badania technologii produkcji warsztatu odlewniczego z epoki brązu i wczesnej epoki żelaza przyczyniają się do wzrostu świadomości o stosowanych technikach przygotowania form i wykorzystywanych stopach. Współczesne narzędzia i techniki komputerowe wspomagają badania dawnych technologii i służą ich upowszechnianiu.
Źródło:
Metallurgy and Foundry Engineering; 2015, 41, 1; 45-56
1230-2325
2300-8377
Pojawia się w:
Metallurgy and Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of a New Innovative Ceramic Material for Investment Casting Technology
Autorzy:
Stefański, Z.
Izdebska-Szanda, I.
Angrecki, M.
Powiązania:
https://bibliotekanauki.pl/articles/381703.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
innovative foundry technology
innovative foundry materials
investment casting technology
olivine sand
self-supporting mould
Innowacyjna technologia odlewnicza
innowacyjne materiały odlewnicze
odlewnictwo
forma odlewnicza
Opis:
The article presents the research results of a new ceramic material, in which olivine sand was used as the matrix. This new ceramic material was studied at the angle of its application in the investment casting technology. This material will be mainly used for preparing self-supporting moulds for castings made of aluminium and magnesium alloys, replacing the expensive material – molochite which has been used so far. The article presents the results of mineralogical research of olivine sand, as well as thermophysical research of the new ceramic material made on the olivine sand matrix. Comparative research of both materials was conducted, i.e. with the olivine and molochite matrix, then the assessment of the quality of the new ceramic material was made. What is more, the research results of the developed ceramics and its usefulness for the production of castings are presented.
Źródło:
Archives of Foundry Engineering; 2014, 14, 1 spec.; 51-56
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bronze Jewellery from the Early Iron Age urn-field in Mała Kępa. An approach to casting technology
Autorzy:
Garbacz-Klempka, A.
Kowalski, Ł.
Gackowski, J.
Perek-Nowak, M.
Powiązania:
https://bibliotekanauki.pl/articles/379760.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
bronze jewellery
non-destructive testing
investment casting
X-ray fluorescence spectroscopy
archaeometallurgy
Lusatian culture
biżuteria z brązu
badania nieniszczące
odlewnictwo
spektroskopia rentgenowska
archeometalurgia
kultura łużycka
Opis:
This study characterizes the bronze jewellery recovered from the Lusatian culture urn-field in Mała Kępa (Chełmno land, Poland). Among many common ornaments (e.g. necklaces, rings, pins) the ones giving evidence of a steppe-styled inspiration (nail earrings) were also identified. With the dendritic microstructures revealed, the nail earrings prove the implementing of a lost-wax casting method, whereas some of the castings were further subjected to metalworking. The elemental composition indicates the application of two main types of bronze alloys: Cu-Sn and Cu-Sn-Pb. It has been established that the Lusatian metalworkers were familiar with re-melting the scrap bronze and made themselves capable of roasting the sulphide-rich ores. The collection from Mała Kępa has been described in terms of its structure and composition. The investigations were made by means of the energy dispersive X-ray fluorescence spectroscopy (ED-XRF), scanning electron microscopy (SEM) coupled with an energy dispersive X - ray analysis system (EDS) and optical microscopy (OM). In order to fingerprint an alloy profile of the castings with a special emphasis on the nail earrings, the data-set (ED-XRF, EDS) was statistically evaluated using multidimensional analyses (FA, DA).
Źródło:
Archives of Foundry Engineering; 2017, 17, 3; 175-183
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Surface casting defects inspection using vision system and neural network techniques
Autorzy:
Świłło, S. J.
Perzyk, M.
Powiązania:
https://bibliotekanauki.pl/articles/380699.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
nondestructive testing
machined aluminum die castings
image processing algorithms
vision system inspection
neural network
badanie nieniszczące
odlewnictwo ciśnieniowe
algorytm przetwarzania obrazu
inspekcja wizyjna
sieć neuronowa
Opis:
The paper presents a vision based approach and neural network techniques in surface defects inspection and categorization. Depending on part design and processing techniques, castings may develop surface discontinuities such as cracks and pores that greatly influence the material’s properties Since the human visual inspection for the surface is slow and expensive, a computer vision system is an alternative solution for the online inspection. The authors present the developed vision system uses an advanced image processing algorithm based on modified Laplacian of Gaussian edge detection method and advanced lighting system. The defect inspection algorithm consists of several parameters that allow the user to specify the sensitivity level at which he can accept the defects in the casting. In addition to the developed image processing algorithm and vision system apparatus, an advanced learning process has been developed, based on neural network techniques. Finally, as an example three groups of defects were investigated demonstrates automatic selection and categorization of the measured defects, such as blowholes, shrinkage porosity and shrinkage cavity.
Źródło:
Archives of Foundry Engineering; 2013, 13, 4; 103-106
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Monitoring of Manufacture Stability of Large Turbine Blades Using Infrared Thermography (IRT) in Investment Casting Technology
Autorzy:
Herman, A.
Vrátný, O.
Kubelková, I.
Powiązania:
https://bibliotekanauki.pl/articles/381486.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
casting defect
product development
investment casting
wax pattern
turbine blade
infrared thermography
wada odlewu
rozwój produktu
odlewnictwo precyzyjne
model woskowy
łopatka wirnikowa
termografia w podczerwieni
Opis:
With increasing technology development, an increasing emphasis is placed on the precision of products, but cannot be guaranteed without a stable production process. To ensure the stability of the production process, it is necessary to monitor it in detail, find its critical locations and eliminate or at least control it. With such a precise manufacturing method as investment casting, such a process is a must. This paper therefore deals with monitoring the production process of wax models of large turbine blades using infrared thermography. The aim was to evaluate the critical locations of this production and to propose recommendations for their elimination or, at the very least, significant mitigation of their impact on the final quality of the large turbine blade casting.
Źródło:
Archives of Foundry Engineering; 2018, 18, 4; 9-14
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the Causes of Cracks in a Thick-Walled Bush Made of Die-Cast Aluminum Bronze
Autorzy:
Pisarek, B. P.
Kołakowski, D.
Pacyniak, T.
Powiązania:
https://bibliotekanauki.pl/articles/381784.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
information technology
foundry industry
MAGMA5
die casting
complex aluminium bronze
hot tear
cold crack
technologia informatyczna
przemysł odlewniczy
odlewnictwo ciśnieniowe
brąz aluminiowy
pęknięcie zimne
Opis:
For the die casting conditions of aluminium bronzes assumed based on the literature data, a thick-walled bush was cast, made of complex aluminium bronze (Cu-Al-Fe-Ni-Cr). After the cast was removed from the mould, cracks were observed inside it. In order to identify the stage in the technological production process at which, potentially, the formation of stresses damaging the continuity of the microstructure created in the cast was possible (hot cracking and/or cold cracking), a computer simulation was performed. The article presents the results of the computer simulation of the process of casting the material into the gravity die as well as solidifying and cooling of the cast in the shape of a thick-walled bush. The simulation was performed with the use of the MAGMA5 program and by application of the CuAl10Ni5,5Fe4,5 alloy from the MAGMA5 program database. The results were compared with the location of the defects identified in the actual cast. As a result of the simulation of the die-casting process of this bush, potential regions were identified where significant principal stresses accumulate, which can cause local hot and cold cracking. Until now, no research has been made of die-cast aluminium bronzes with a Cr addition. Correlating the results of the computer simulation validated by the analysis of the actual cast made it possible to clearly determine the critical regions in the cast exposed to cracking and point to the causes of its occurrence. Proposals of changes in the bush die casting process were elaborated, in order to avoid hot tearing and cold cracking. The article discusses the results of preliminary tests being a prologue to the optimization of the die-casting process parameters of complex aluminium bronze thick-walled bushs.
Źródło:
Archives of Foundry Engineering; 2016, 16, 4; 119-124
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of porosity in Al alloy die castings
Autorzy:
Říhová, M.
Cech, J.
Havlíčková, J.
Powiązania:
https://bibliotekanauki.pl/articles/382450.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
stop AlSi9Cu3
odlewnictwo
kadłub silnika
porowatość
wielkość mechaniczna
symulacja
AlSi9Cu3 alloy
casting
engine block
porosity
mechanical values
simulation
Opis:
Mechanical properties of an Al-alloy die casting depend significantly on its structural properties. Porosity in Al-alloy castings is one of the most frequent causes of waste castings. Gas pores are responsible for impaired mechanical-technological properties of cast materials. On the basis of a complex evaluation of experiments conducted on AlSi9Cu3 alloy samples taken from the upper engine block which was die-cast with and without local squeeze casting it can be said that castings manufactured without squeeze casting exhibit maximum porosity in the longitudinal section. The area without local squeeze casting exhibits a certain reduction in mechanical properties and porosity increased to as much as 5%. However, this still meets the norms set by SKODA AUTO a.s.
Źródło:
Archives of Foundry Engineering; 2012, 12, 1; 93-98
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Prediction of Properties of Microwave-Hardened Sandmixes Containing Water-Glass with Use of Neural Networks
Autorzy:
Stachowicz, M.
Pałyga, Ł.
Granat, K.
Powiązania:
https://bibliotekanauki.pl/articles/382728.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
foundry engineering
artificial neural network
loose self-hardening sand
moulding sand
water glass
microwave
odlewnictwo
sztuczna sieć neuronowa
sypka masa samoutwardzalna
masa formierska
szkło wodne
mikrofala
Opis:
Presented are results of a research on the possibility of using artificial neural networks for forecasting mechanical and technological parameters of moulding sands containing water-glass, hardened in the innovative microwave heating process. Trial predictions were confronted with experimental results of examining sandmixes prepared on the base of high-silica sand, containing various grades of sodium water-glass and additions of a wetting agent. It was found on the grounds of obtained values of tensile strength and permeability that, with use of artificial neural networks, it is possible complex forecasting mechanical and technological properties of these materials after microwave heating and the obtained data will be used in further research works on application of modern analytic methods for designing production technology of high-quality casting cores and moulds.
Źródło:
Archives of Foundry Engineering; 2015, 15, 2; 99-104
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
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