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The Influence of Riser Shape on Feeding Effectiveness of Solidifying Casting

Sowa L., Skrzypczak T., Kwiatoń P.

Archives of Foundry Engineering

2019

iss. 4

91--94

The mathematical model and numerical simulations of the solidification of a cylindrical shaped casting, which take into account the process of filling the mould cavity by liquid metal and feeding the casting through the riser during its solidification, are presented in the paper. Mutual dependence of thermal and flow phenomena were taken into account because have an essential influence on solidification process. The effect of the riser shape on the effectiveness of feeding of the solidifying casting was determined. In order to obtain the casting without shrinkage defects, an appropriate selection of riser shape was made, which is important for foundry practice. Numerical calculations of the solidification process of system consisting of the casting and the conical or cylindrical riser were carried out. The velocity fields have been obtained from the solution of momentum equations and continuity equation, while temperature fields from solving the equation of heat conductivity containing the convection term. Changes in thermo-physical parameters as a function of temperature were considered. The finite element method (FEM) was used to solve the problem.

Electromagnetic Stirring with Superimposed Travelling and Rotating Magnetic Fields

Cramer A., Pal J., Gerbeth G.

Przegląd Elektrotechniczny

2008

R. 84, nr 11

144-148

Flow visualization and velocity measurements in a liquid metal flow were performed in order to study the combined action of a rotating and a travelling magnetic field. The combination of both fields, which is not necessarily a linear superposition, may give rise to an inherent three-dimensional constituent of the electromagnetic force distribution. As the Lorentz force may also become time-dependent, a quite intense mixing of metallic melts is achievable.

Wizualizacja przepływu i pomiary prędkości przepływu ciekłego metalu zostały przeprowadzone celem przestudiowania łącznego działania wirującego i biegnącego pola magnetycznego. Kombinacja obu pól, która niekonieczne jest superpozycja liniową może spowodować, że rozkład sił elektromagnetycznych staje się trójwymiarowy. Skoro siła Lorenza może być także zależna od czasu można spodziewać się całkiem intensywnego mieszania kąpieli metalowej trójwymiarowe.