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1
Content available Application of Modular Die for Fluidity Test and Monitoring of the Pressing Force Flow by Semi-solid Squeeze Casting of AlSi7Mg0.3
Martinec D., Pastirčák R.
Archives of Foundry Engineering
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2020
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Vol. 20, iss. 3
69--73
EN
The fluidity is the term to determine the materials ability to fill the mold cavity properly. Fluidity is complex property with many variables. Up to this date, there is no methodology for defining the fluidity in a semisolid material state. Submitted paper deals with the proposal of a new method designed for aluminium alloy fluidity evaluation in semi-solid state trough the design of the layered construction die. Die will be primary used for fluidity tests of semi-solid squeeze casted aluminium alloy and to observe the pressing force flow by mentioned casting technology. The modularity consists of possibility to change each die segment. In the experiment the die design was evaluated by simulation in ProCAST 11.5 and by production of experimental castings. The die was made by laser cutting technology from construction steel S355JR. Experimental material was aluminium alloy AlSi7Mg0.3. The temperature of the semisolid state was chosen to achieve 35% of solid phase. The result of next study should be a selected parameters observation and their effect on the fluidity of aluminium alloy in semi-solid state. This will be very important step to determine the optimal conditions to achieve a castings with certain wall thickness produced by the method of semi-solid squeeze casting.
2
Content available remote Numerical modelling of the thermal and fluid flow phenomena of the fluidity test
Bokota A., Sowa L.
Archives of Foundry Engineering
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2010
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Vol. 10, iss. 1
15-18
EN
In the paper, two mathematical models of the solidification of a cylindrical shaped casting, which take into account the process of filling the mould cavity with molten metal during the vertical fluidity test, has been proposed. In the general model, velocity and pressure fields were obtained by solving the momentum equations and the continuity equation, whereas the thermal fields were obtained by solving the heat conduction equation containing the convection term. In the simplified model, making assumptions relating to both the material and the geometry of the region, the general equations for continuity and momentum have been reduced to single equation for pressure. This approach leads as to accelerate significantly of the fluid flow calculations. In this model, coupling of the thermal and fluid flow phenomena has been taken into consideration by the changes of the fluidity function and thermophysical parameters of alloy with respect to the temperature. The problem has been solved by the finite element method.
3
Content available remote Numerical analysis of the thermal and fluid flow phenomena of the fluidity test
Sowa L.
Archives of Foundry Engineering
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2010
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Vol. 10, iss. 1
157-160
EN
In the paper, two mathematical and numerical models of the metals alloy solidification in the cylindrical channel of fluidity test, which take into account the process of filling the mould cavity with molten metal, has been proposed. Velocity and pressure fields were obtained by solving the momentum equations and the continuity equation, while the thermal fields were obtained by solving the heat conduction equation containing the convection term. Next, the numerical analysis of the solidification process of metals alloy in the cylindrical mould channel has been made. In the models one takes into account interdependence of the thermal and dynamical phenomena. Coupling of the heat transfer and fluid flow phenomena has been taken into consideration by the changes of the fluidity function and thermophysical parameters of alloy with respect to the temperature. The influence of the velocity or the pressure and the temperature of metal pouring on the solid phase growth kinetics were estimated. The problem has been solved by the finite element method.
4
Content available remote Computer simulation of round bar fluidity test
Borowiecki B.
Krzepnięcie Metali i Stopów
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1999
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R. 1, nr 40
15--24
EN
Computer simulation of filling with metal the vertical channels of various diameters in fluidity test has been concerned in the paper. Mathematical and numerical model of solidification process during liquid phase move in mould channels has been worked out. Numerical calculation results has been compared to the empirical results and obtained satisfactory compatible for low-overheated metal. Analysis of the numerical results confirmed hypothesis, that in the channels of the various diameters there creates boundary layer of the same thickness. The layer depends on length of channel, metal viscosity and thermal physical properties of mould material.
PL
Badania symulacyjne procesu wypełniania pionowych kanałów formy o różnych średnicach z jednoczesnym uwzględnianiem zjawiska krzepnięcia metalu umożliwiają wytłumaczenie wielu zjawisk [6, 7, 8, 11]. Celem badań była weryfikacja przyjętej hipotezy w myśl której grubość warstwy przyściennej metalu w kanale pionowym formy nie zależy od średnicy kanału lecz od lepkości metalu i wymiany ciepła na granicy metal forma, która wpływa na rozkład pola prędkości i temperatur w tym kanale. [...]
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