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Tytuł:
Strength of the Bond of Structural Steel S235JR to Bronze SAE660 Produced by Casting in Pre-Mold
Autorzy:
Zaheri, M.
Vahdat, S. E.
Powiązania:
https://bibliotekanauki.pl/articles/380357.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
casting in pre-mold
bond length
strength of the bond
thrust bearing
weld
odlew wstępny
czas wiązania
wytrzymałość połączenia
łożysko
spawanie
Opis:
Different methods are used for production of bronze bearings. In terms of technical specifications, the success of each of these methods depends on the bond’s strength and in terms of economic, the production method is important. In this study, the aim is to study the strength and microstructure of steel-bronze thrust bearing bond that has been produced through the casting using pre-mold. In this study, in order to bond, the raw metals are chemically washed with sulfuric acid solution for five minutes at first. Then, the molten bronze SAE660 is cast in a structural steel S235JR pre-mold. The bond’s strength has been measured using the shear test three times; the measurement of bond’s length has been done using field emission scanning electron microscope (FESEM). The results indicate that the strength of the bond is at least 94.8 MPa and bond’s length is 0.45 micrometers. Therefore, this method was successful for trust bearing application.
Źródło:
Archives of Foundry Engineering; 2017, 17, 3; 149-154
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessing the Surface Distortion of Plaster Molds Made with the Use of SLA Models
Autorzy:
Shumkov, A. A.
Ablyaz, T. R.
Muratov, K. R.
Powiązania:
https://bibliotekanauki.pl/articles/382230.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
stereolithography
photopolymers
form accuracy
cell structure
molding model
plaster form
full-mold casting
stereolitografia
fotopolimer
dokładność formy
struktura komórkowa
odlewanie pełnowymiarowe
Opis:
The method of determining the accuracy of polymer molds in plaster forms has been discussed. Distortion of the surface of molds and plaster molds has been assessed. It has been found that the presence of monolithic and porous structure in the samples does not change the accuracy of the surfaces when forms are prepared for removing the material of the model. It has been found that in case of full-mold casting it is more expedient to form the mold cavity with cellular adjustable structures of molding prototypes.
Źródło:
Archives of Foundry Engineering; 2017, 17, 3; 123-126
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of Fluid Flow and Solidification in Billet Caster Continuous Casting Mold with Electromagnetic Stirring
Autorzy:
Maurya, A.
Kumar Jha, P.
Powiązania:
https://bibliotekanauki.pl/articles/351082.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
continuous casting
mold
electromagnetic stirring
fluid flow
solidification
Opis:
Electromagnetic stirrer generates swirling fluid flow, boosts the mixing of molten steel near the solidification front and enhances the quality of the continuously cast products. In the present investigation, attention is paid towards studying the effect of in-mold electromagnetic stirring on fluid flow and solidification. A three-dimensional coupled mathematical model of solidification and magnetohydrodynamics has been established for billet caster mold. The alternating magnetic field is applied to the solidification model where fluid flow, heat transfer, and electromagnetic equations are solved simultaneously. It has been found that an increase in field frequency decreases the length of stirring and the liquid fraction of the steel at the center of the mold exit. Tangential velocity near the solidification front increases with the magnetic field frequency or flux density, due to which, a break in solidified shell near stirrer position is predicted whose width increases accordingly.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 1; 413-424
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Novel Method of Thermal Conductivity Measurement Using Stefan-Boltzmann Law
Autorzy:
Leśniewski, W.
Czekaj, E.
Wieliczko, P.
Wawrylak, M.
Powiązania:
https://bibliotekanauki.pl/articles/356312.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
thermal conductivity
thermal radiation
ceramic shell mold
aluminum casting
Opis:
The article presents a novel method that allows measurement of thermal conductivity that is based on Stefan-Boltzmann law. The developed method can be used to determine thermal conductivity of ceramic investment casting molds. The methodology for conducting thermal conductivity tests of ceramic material samples is presented. Knowledge of the value of thermal capacity and thermal conductivity as a function of temperature enables computer simulations of the process of cooling and solidification of liquid metal in a mold.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 1; 311-315
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Interaction of Titanium with Ceramic Molds in the Conditions of Electron Beam Casting Technology
Autorzy:
Kaliuzhnyi, P.
Voron, M.
Mykhanian, O.
Tymoshenko, A.
Neima, O.
Iangol, O.
Powiązania:
https://bibliotekanauki.pl/articles/2079826.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
investment casting
electron beam casting
titanium
ceramic shell mold
technologie odlewania
wiązka elektronów
tytan
formy ceramiczne
Opis:
For the manufacture of near net shape complex titanium products, it is necessary to use investment casting process. Melting of titanium is promising to carry out by electron beam casting technology, which allows for specific processing of the melt, and accordingly control the structure and properties of castings of titanium alloys. However, the casting of titanium in ceramic molds is usually accompanied by a reaction of the melt with the mold. In this regard, the aim of the work was to study the interaction of titanium melt with ceramics of shell molds in the conditions of electron beam casting technology. Ceramic molds were made by using the following refractory materials – fused corundum Al2O3, zircon ZrSiO4 and yttria-stabilized zirconium oxide ZrO2, and ethyl silicate as a binder. Melting and casting of CP titanium was performed in an electron beam foundry. Samples were made from the obtained castings and electron microscopic metallography was performed. The presence and morphology of the altered structure, on the sample surface, were evaluated and the degree and nature of their interaction were determined. It was found that the molds with face layers of zirconium oxide (Z1) and zircon (ZS1) and backup layers of corundum showed the smallest interaction with the titanium melt. Corundum interacts with titanium to form a non-continuous reaction layer with thickness of 400-500 μm. For shell molds with face and backup layers of zircon on the surface of the castings, a reaction layer with thickness of 500-600 μm is formed. In addition, zirconium-silicon eutectic was detected in these layers.
Źródło:
Archives of Foundry Engineering; 2021, 21, 3; 27-32
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Gas Atmosphere Formed in Casting by Full Mold Process
Atmosfera gazowa występująca podczas wykonywania odlewów w technologii pełnej formy
Autorzy:
Mocek, J.
Chojecki, A.
Powiązania:
https://bibliotekanauki.pl/articles/350844.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
casting
full mold
formation of the gap
odlew
pełna forma
powstawanie szczelin
Opis:
A test mold was designed to investigate the full mold process. Pressure changes in a gap developing between the pattern made of foamed polystyrene and the raising column of liquid alloy were determined. Studies were conducted pouring molds with cast iron and with AK11 silumin. It was found that pressure is significantly higher in the case of cast iron, due to a higher rate of pattern decomposition and more advanced dissociation of hydrocarbons. The increase in pressure was observed to have no significant effect on changes in the pouring rate as it was compensated by higher metallostatic pressure. The increase of pressure occurs immediately after the start of pouring, it reaches a maximum and then stabilizes or decreases smoothly as a result of the drop in metallostatic pressure. The temperature of pouring has a significant effect on the decomposition rate of hydrocarbons evolving from the metal. During pouring of cast iron, the presence of hydrogen was revealed. It was particularly evident across the gas-permeable coating, where the concentration has exceeded 40%. Hydrogen precipitation was accompanied by an evolution on the casting surface of considerable amounts of pyrolytic carbon. It was found that gases forming in the gap were totally free from oxygen.
Zaprojektowano próbną formę do badania procesu full mold. Określono zmiany ciśnienia w szczelinie powstającej pomiędzy styrodurowym modelem a podnoszącym się ciekłym stopem. Badania prowadzono przy zalewaniu form żeliwem oraz siluminem AK11. Stwierdzono, że ciśnienie to jest znacznie wyższe w przypadku żeliwa, co wynika z większej szybkości rozpadu modelu i dalej posuniętej dysocjacji węglowodorów. Wzrost ciśnienia nie powoduje jednak istotnej zmiany szybkości zalewania, ponieważ jest on kompensowany wyższym ciśnieniem metalostatycznym. Wzrost ciśnienia następuje bezpośrednio po rozpoczęciu zalewania, osiąga ono maksimum poczem stabilizuje się lub łagodnie maleje w wyniku zmniejszania ciśnienia metalostatycznego. Temperatura zalewania ma istotny wpływ na stopień rozpadu, wydzielających się z modelu węglowodorów. Przy zalewaniu żeliwa stwierdzono obecność wodoru. Jest ona widoczna zwłaszcza po drugiej stronie powłoki gazoprzepuszczalnej gdzie stężenie sięga powyżej 40%. Wydzielaniu wodoru towarzyszy wydzielanie się na powierzchni odlewu, znacznych ilości pyrolitycznego węgla. Stwierdzono, że gazy tworzące szczelinę są całkowicie wolne od tlenu.
Źródło:
Archives of Metallurgy and Materials; 2014, 59, 3; 1045-1049
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The control of solidification kinetics of the vacuum-cast thin-wall nickel-based superalloys by changing the geometrical characteristics of the ceramic mold
Autorzy:
Cygan, R.
Szeliga, D.
Rokicki, P.
Sieniawski, J.
Suchy, J. S.
Powiązania:
https://bibliotekanauki.pl/articles/381982.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
nickel based superalloy
ceramic mold
thin walled casting
investment casting
nadstop niklu
forma ceramiczna
odlewanie cienkościenne
odlewanie precyzyjne
Opis:
This paper provides an analysis of experimental research and results of investment casting process. Temperature field in a ceramic mold is one of the problems during numerical simulation. Reducing the costs of production in precision casting involves the reduction of scraps, which is one of the fundamental problems of the foundry industry. Reducing these costs is associated with optimization of precision casting technology of aircraft engines critical parts, including control of the solidification front in thin-walled castings of nickel super alloys cast in a vacuum. It is achieved by changing the geometrical characteristics of the ceramic mold. The results of the tests were used to optimize the industrial production of aircraft components in Precision Foundry of WSK Rzeszów. Temperature distribution gained in the conducted tests allowed verification and optimization of computer simulations.
Źródło:
Archives of Foundry Engineering; 2013, 13, 4; 21-28
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reducing Melt Surface Turbulence by Employing Surge and Filter in a Conventional Non-Pressurizing Gating System: Simulation and Experiment
Autorzy:
Baghani, Amir
Kheirabi, Ali
Bahmani, Ahmad
Khalilpour, Hamid
Powiązania:
https://bibliotekanauki.pl/articles/2049678.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
aluminum casting
filter
surge
oxide bifilms
failure analysis
Weibull module
mold filling simulation
Opis:
Tensile strength of aluminum castings has been improved by employing surge and filter in a conventional non-pressurizing gating system. For this purpose, three non-pressurizing bottom-gating systems were designed where the first design was a simple design with no filter and no surge, in the second design filter and in the third one surge was added to the end of runner. Tensile strength, Weibull module, scanning electron microscopy, chemical analysis, and melt pattern during the mold filling were thoroughly analyzed to compare these three designs. it was observed that employing filter and surge in the gating system reduces flow kinetic energy and consequently avoid surface turbulence and air entrainment, which leads to castings with fewer defects and higher reliabilities. Finally, it found that appropriate use of surge in the running system can be as effective as employing a filter in reducing melt front velocity.
Źródło:
Archives of Metallurgy and Materials; 2021, 66, 2; 397-405
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical and Physical Parametric Analysis of a SEN with Flow Conditioners in Slab Continuous Casting Mold
Autorzy:
Gonzalez-Trejo, J.
Real-Ramirez, C. A.
Miranda-Tello, R.
Rivera-Perez, F.
Cervantes-de-la-Torre, F.
Powiązania:
https://bibliotekanauki.pl/articles/351515.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
submerged entry nozzle
fluid-flow modifiers
continuous casting of steel
mold flow patterns
turbulence
Opis:
Some of the most recent technologies that improves the performance in continuous casting process has installed infrastructure outside the mold to modify the natural fluid flow pattern to obtain a quasi-steady condition and promote a uniform solidified shell of steel. The submerged entry nozzle distributes the liquid steel in the mold and can be used to obtain the flow symmetry condition with external geometry improvements. The fluid flow conditioners were located near the outlet ports of the nozzle. The aim of the modifiers is to impose a pseudo symmetric pattern in the upper zone of the mold by inhibiting the fluid exchange between the zones created by conditioners. This work evaluates the effect of the thickness and length of the fluid-flow modifiers on the overall performance of the submerged nozzle. These properties of the fluid-flow modifiers were normalized based on two of the geometric dimensions of the standard equipment. Numerical and physical simulations suggest that the flow modifier should be as thin as possible.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 2A; 927-946
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimization of master alloy amount and gating system design for ductile cast iron obtain in lost foam process
Autorzy:
Just, P.
Kaczorowski, R.
Pacyniak, T.
Powiązania:
https://bibliotekanauki.pl/articles/379923.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
innovative casting technologies
ductile iron
inmold method
lost foam casting
innowacyjna technologia odlewnicza
żeliwo sferoidalne
metoda in mold
tracona piana
Opis:
The paper presents the optimization of master alloy amount for the high nodular graphite yield (80-90%) in cast iron obtain in lost foam process. The influence of the gating system configuration and the shape of the reaction chamber, the degree of spheroidisation cast iron was examined. Research has shown that the, optimal of master alloy amount of 1.5% by mass on casting iron. The degree of spheroidisation is also influenced by the gating system configuration. The best spheroidisation effect was obtained for liquid cast iron was fed into the reaction chamber from the bottom and discharged from the top.
Źródło:
Archives of Foundry Engineering; 2013, 13, 3; 43-46
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
3DP Technology for the Manufacture of Molds for Pressure Casting
Autorzy:
Skorulski, G.
Powiązania:
https://bibliotekanauki.pl/articles/383141.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
innovative materials
innovative casting technologies
rapid prototyping
ceramic mold
pressure casting
materiały innowacyjne
innowacyjne technologie odlewnicze
prototypy
formy ceramiczne
odlewanie ciśnieniowe
Opis:
The paper presents the use of rapid prototyping technology of three dimensional printing (3DP) to make a prototype shell casting mold. In the first step, for identification purposes, a mold was prepared to enable different alloys to be cast. All molds being cast were designed in a universal CAD environment and printed with the zp151 composite material (Calcium sulfate hemihydrate) with a zb63 binder (2-pyrrolidone). It is designated to be used to prepare colourful models presenting prototypes or casting models and molds. The usefulness of 3DP technology for use with copper alloys, aluminum and zinc was analyzed. The strength of the mold during casting was assumed as a characteristic comparative feature in the material resistance to high temperature, the quality of the resulting casting and its surface roughness. Casting tests were carried out in vacuum – pressure casting. The casting programs applied, significantly increased the quality of castings and enabled precise mold submergence. Significant improvement was noted in the quality compared to the same castings obtained by gravity casting.
Źródło:
Archives of Foundry Engineering; 2016, 16, 3; 99-102
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of the shape of the reaction chamber on spheroidisation of cast iron produced in the lost foam casting process with use of the inmold method
Autorzy:
Just, P.
Pacyniak, T.
Powiązania:
https://bibliotekanauki.pl/articles/382866.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
żeliwo sferoidalne
metoda in mold
tracona piana
innowacyjne technologie odlewnicze
komora reakcyjna
nodular cast iron
Inmold method
lost foam casting
innovative casting technologies
reaction chamber
Opis:
The article presents the results of the research on the influence of the shape of reaction chamber on spheroidisation of cast iron produced with use of the inmold method. The amounts of nodular graphite precipitates in castings produced with the use of different reaction chambers have been compared.
Źródło:
Archives of Foundry Engineering; 2012, 12, 2; 175-178
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ductile cast iron obtain by lost foam process and inmold method
Wytwarzanie odlewów z żeliwa sferoidalnego w technologii inmold i lost foam
Autorzy:
Kaczorowski, R.
Just, P.
Pacyniak, T.
Powiązania:
https://bibliotekanauki.pl/articles/350916.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
nodular cast iron (ductile cast iron)
inmold method
lost foam casting
innovative casting technologies
reaction chamber
żeliwo sferoidalne
metoda in mold
odlew z żeliwa sferoidalnego
innowacyjne technologie odlewnicze
komora reakcyjna
Opis:
This paper presents a technology of ductile cast iron obtain by lost foam process with use of inmold method. Spheroidization was carried out using master alloy in an amount of 1.5% by mass on casting iron. Research the influence of the gating system configuration and the shape of the reaction chamber, the degree of spheroidization cast iron, which estimated based on the shape of the graphite. Research have shown that the greatest impact on the degree of spheroidization has cast the infusion position relative to the casting inlet and the reaction chamber, and the shape of the reaction chamber.
W pracy przedstawiono technologię otrzymywania odlewów z żeliwa sferoidalnego metodą inmold z wykorzystaniem procesu pełnej formy. Sferoidyzację prowadzono z użyciem zaprawy sferoidyzująco-modyfikującej w ilości 1,5% na masę sferoidyzowanego żeliwa. Przeprowadzono badania wpływu konfiguracji układu wlewowego oraz kształtu komory reakcyjnej na stopień sferoidyzacji żeliwa, który określono na podstawie wskaźnika kształtu grafitu. Badania wykazały, że największy wpływ na stopień sferoidyzacji żeliwa ma położenie wlewu doprowadzającego względem odlewu i komory reakcyjnej, oraz kształt komory reakcyjnej.
Źródło:
Archives of Metallurgy and Materials; 2013, 58, 3; 823-826
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Innovative Foundry Technology and Material Using Fused Deposition Modeling and Polylactic Acid Material in Sand Casting
Autorzy:
Anakhu, P. I.
Bolu, C. C.
Abioye, A. A.
Onyiagha, G.
Boyo, H.
Jolayemi, K.
Azeta, J.
Powiązania:
https://bibliotekanauki.pl/articles/381692.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
fused deposition modeling
rapid pattern
sand casting pattern
FDM printed
PLA pattern
mold cavity
osadzanie przetopionego materiału
model odlewniczy
gniazdo formujące
Opis:
In sand casting, Fused Deposition Modeling (FDM) printing by using Poly Lactic Acid (PLA) filament is one of the innovative foundry technologies being adopted to substitute traditional pattern making. Several literatures have reported the influence of process parameters such as raster angle and print speed on some mechanical properties of FDM-printed, PLA-prototypes used in other applications. This study investigated the effects of interior fill, top solid layer, and layer height on the compressive strength of rapid patterns for sand casting application. Different values of the process parameters were used to print the pre-defined samples of the PLA-specimens and a compression test was performed on them. The coupled effects of the process parameters on compressive strength were investigated and the optimum values were determined. Interior fill of 36%, layer height of 0.21 mm and top solid layer of 4 were found to produce a FDM-printed, PLA-pattern that sustained a compaction pressure of 0.61 MPa. A simulation analysis with ANSYS® to compare failure modes of both experiment and model shows a similarity of buckling failure that occurred close to the base of each specimen.
Źródło:
Archives of Foundry Engineering; 2018, 18, 2; 65-71
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Selection of materials and development of technology for the production of elements used in conditions of extreme tribological wear
Autorzy:
Wilk-Kołodziejczyk, D.
Pirowski, Z.
Grudzień-Rakoczy, M.
Bitka, A.
Chrzan, T.
Powiązania:
https://bibliotekanauki.pl/articles/2079807.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
innovative casting technologies
wear
selection of materials
conditions of extreme
shell mold
innowacyjne technologie odlewnicze
zużycie tribologiczne
dobór materiałów
warunki ekstremalne
Opis:
Work was done as a part of the project " New generation haulage system of highly productive longwall systems" aiming to develop and implement a new longwall shearer system called KOMTRACK. The widely used EICOTRACK feed system developed forty years ago is not adapted to modern longwall shearers' power. Within the project, an innovative, flexible feed system with a modular structure was created with the possibility of continuous adjustment to the carbon wall's unevenness. Newly-developed three cast steels variants have been initially selected to fabricate this system's elements. The material's final selection was realized based on the tensile tests, Charpy impact tests, Brinell hardness surveys, and wear resistance measurements. Results analysis allowed to select cast steel marked as "2", which fulfilled all requirements and was used in further casting trials.
Źródło:
Archives of Foundry Engineering; 2021, 21, 4; 47-54
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
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