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Wyświetlanie 1-8 z 8
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:
Industrial Tests on "Formowax" Pattern Wax Under Investment Foundry Conditions
Autorzy:
Kurdziel, P.
Dydak, A.
Robak, I.
Kubosz, G.
Powiązania:
https://bibliotekanauki.pl/articles/383038.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
innovative materials
innovative technologies
investment casting
pttern waxes
materiały innowacyjne
technologie innowacyjne
inwestycje odlewnicze
wosk modelowy
Opis:
Soft pattern waxes used in investment castings are a mixture of paraffin, stearin and minor amounts of ceresin, polyethylene wax and other natural and synthetic waxes. Nowadays foundries conduct the process of pattern wax formulating on their own. However, instability of the ingredients parameters can have a negative impact on the technological characteristics of the obtained waxes. The paper presents the results of tests on applying a ready-made "FORMOWAX" pattern wax developed by Polwax Sp. z o.o. Application of the reference wax was tested for standard patterns made in Specodlew investment foundry.
Źródło:
Archives of Foundry Engineering; 2012, 12, 2s; 41-44
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investment Casting of AZ91 Magnesium Open-Cell Foams
Autorzy:
Kapłon, Honorata
Dmitruk, Anna
Naplocha, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/27314112.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
innovative foundry technologies
innovative materials
metal foams
investment casting
magnesium alloy
Innowacyjne technologie odlewnicze
innowacyjne materiały
pianki metalowe
stopy magnezu
Opis:
The process of investment casting of AZ91 magnesium alloy open-cell porosity foams was analysed. A basic investment casting technique was modified to enable the manufacturing of magnesium foams of chosen porosities in a safe and effective way. Various casting parameters (mould temperature, metal pouring temperature, pressure during metal pouring and solidifying) were calculated and analysed to assure complete mould filling and to minimize surface reactions with mould material. The foams manufactured with this method have been tested for their mechanical strength and collapsing behaviour. The AZ91 foams acquired in this research turned out to have very high open porosity level (>80%) and performed with Young’s modulus of ~30 MPa on average. Their collapsing mechanism has turned out to be mostly brittle. Magnesium alloy foams of such morphology may find their application in fields requiring lightweight materials of high strength to density ratio or of high energy absorption properties, as well as in biomedical implants due to magnesium’s high biocompatibility and its mechanical properties similar to bone tissue.
Źródło:
Archives of Foundry Engineering; 2023, 23, 1; 11--16
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
Tytuł:
Method and Apparatus for Assessing the Properties of Slags
Autorzy:
Biernat, S.
Bydałek, A. W.
Wołczyński, W.
Holtzer, M.
Powiązania:
https://bibliotekanauki.pl/articles/381284.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
environmental protection
innovative materials
innovative casting technologies
laboratory station
slags
ochrona środowiska
innowacyjne materiały odlewnicze
technologie innowacyjne
stanowisko laboratoryjne
żużle
Opis:
A special Slag-Prop Cu database has been developed to archive data from laboratory and industrial tests related to post-reduction slags. In order to enrich the data areas, it was decided to design a system for measuring the temperature of the liquid slag and its viscosity. Objectives of research work are to gather information on the properties of post-slags such as the temperature of liquid slag and its viscosity. The discussed issues are especially important in the foundry practice. Designed research stand and using of database applications can greatly facilitate the work of metallurgists, foundrymen, technologists and scientists. The viscosity measurement was developed and presented earlier. The author's analytical methodology was supplemented by a thyristor measuring system (described in the article). The system temperature measurement can be performed simultaneously in 3 ways to reduce the measurement error. Measurement of the voltage mV - using the Seebeck effect can be measured throughout the entire range of thermocouple resistance, up to 1300 °C. Direct temperature measurement ⁰C - measurement only below 1000 ⁰C. Additional measurement - the measurement can also be read from the pyrometer set above the bath. The temperature and the reading frequency depend on the device itself. The principle of measurement is that in a molten metal / slag crucible, we put a N-type thermocouple. The thermocouples are hung by means of a tripod above the crucible and placed in a crucible. The thermocouple is connected to a compensating line dedicated to this type of thermocouple. The cable is in turn connected to a special multimeter that has the ability to connect to a computer and upload results. Temperature measurement can be performed simultaneously in 3 ways to reduce the measurement error. The Sn-Pb alloy has been subjected to testing for proper operation of the device. In this foot should be observed the supercooling of the liquid, which initiates the crystallization process and in which latent heat begins to exude raising the temperature until the coagulation temperature is reached.
Źródło:
Archives of Foundry Engineering; 2017, 17, 3; 13-18
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Alloy Additions on the Structure and Mechanical Properties of the AlSi7Mg0.3 Alloy
Autorzy:
Pisarek, B. P.
Rapiejko, C.
Szymczak, T.
Pacyniak, T.
Powiązania:
https://bibliotekanauki.pl/articles/380373.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
innowacyjne technologie odlewnicze
materiały odlewnicze
odlew precyzyjny
stopy aluminium
dodatki stopowe
SDAS
indeks jakości
innovative casting technologies
innovative materials
precision investment casting
aluminium alloys
alloy additions
quality index
Opis:
The study presents the results of the investigations of the effect of Cu, Ni, Cr, V, Mo and W alloy additions on the microstructure and mechanical properties of the AlSi7Mg0.3 alloy. The examinations were performed within a project the aim of which is to elaborate an experimental and industrial technology of producing elements of machines and devices complex in their construction, made of aluminium alloys by the method of precision investment casting. It was demonstrated that a proper combination of alloy additions causes the crystallization of complex intermetallic phases in the silumin, shortens the SDAS and improves the strength properties: Rm, Rp0.2,HB hardness. Elevating these properties reduces At, which, in consequence, lowers the quality index Q of the alloy of the obtained casts. Experimental casts were made in ceramic moulds preliminarily heated to 160 °C, into which the AlSi7Mg0.3 alloy with the additions was cast, followed by its cooling at ambient temperature. With the purpose of increasing the value of the quality index Q, it is recommended that the process of alloy cooling in the ceramic mould be intensified and/or a thermal treatment of the casts be performed (ageing) (T6).
Źródło:
Archives of Foundry Engineering; 2017, 17, 1; 137-142
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Studies of Binding Kinetics and Choice of Self-Hardening Moulding and Core Sands Used for Casting Massive Parts for Wind Power Industry under the Conditions of Krakodlew Foundry
Autorzy:
Rączka, M.
Isendorf, B.
Powiązania:
https://bibliotekanauki.pl/articles/382470.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
wind energy
innovative materials
innovative casting technologies
environmental protection
ductile iron
moulding sand
energia wiatrowa
innowacyjne materiały
innowacyjna technologia odlewania
ochrona środowiska
żeliwo
masy formierskie
Opis:
In highly developed countries, a significant progress in the use of alternative and clean energy sources has recently been observed. The European Union has implemented a programme to build wind turbines. It is estimated that in the coming years, thanks to the support in tax and credit, the global energy will develop very intensively. Many components of the wind turbines are castings. The basic material used for these castings is ductile iron, which in this particular case must meet high requirements imposed by the operating conditions of wind turbines. Anticipating an increase in customer demand for this type of castings, Krakodlew SA has decided to modernize its foundry using the ability to obtain external financing. The ductile iron manufacturing technology is now being developed and adapted to the specific conditions of the foundry plant, including the melting process yielding cast material with the required chemical composition, the technology of moulding, and the conditions for possible secondary metallurgy, spheroidizing treatment and graphitizing inoculation. The fulfilment of the imposed conditions for the casting production demands the use of advanced casting technologies introduced to the manufacturing process. The development of technology to launch the production of ductile iron castings for the wind power industry was supported by The National Centre for Research and Development (NCBiR). This article presents part of research on the binding kinetics of furan resin sands and choice of their composition for moulds and cores to make heavy castings used as components of equipment for the wind power industry.
Źródło:
Archives of Foundry Engineering; 2017, 17, 2; 222-226
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New Use of Instruments for More Accurate Wax Pattern Blade Segment Production
Autorzy:
Herman, A.
Kubelková, I.
Vrátný, O.
Powiązania:
https://bibliotekanauki.pl/articles/381106.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
foundry industry
application of information technology
innovative foundry technologies
innovative materials
Investment casting
gas turbines
infrared thermography
simulation
przemysł odlewniczy
zastosowanie technologii informatycznej
innowacyjne technologie odlewnicze
innowacyjne materiały
turbiny gazowe
symulacja
Opis:
Precision casting is currently motivated by high demand especially for castings for the aerospace, automotive and gas turbine industries. High demands on precision of this parts pressure foundries to search for the new tools which can help them to improve the production. One of these tools is the numerical simulation of injection process, whereas such software especially for investment casting wax injection, process does not exist yet and for this case must be the existing software, for alloys or plastic, modified. This paper focuses on the use of numerical simulations to predict the behavior of injected models of gas turbine blades segments. The properties of wax mixtures, which were imported into the Cadmould simulation software as a material model, were found. The results of the simulations were verified using the results of 3D scanning measurements of wax models. As a supporting technology for verifying the results was used the Infrared Thermography.
Źródło:
Archives of Foundry Engineering; 2019, 2; 101-106
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-8 z 8

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