Aluminum and other light metal casting foundries have
traditionally used the technique of pouring the molten metal into
molds from a ladle, relying on gravity to fill the small spaces in
the mold cavity. This must be done very carefully so the molten
metal does not experience oxidizing turbulence.
In the science of Physics, Laplace's Law describes the
interaction between a magnetic field and an electric current when
they are applied at right angles to each other and to a conductor of
electricity. This Law explains how induction motors function and is
better known as Fleming's Left Hand Rule, in which the thumb,
forefinger and middle finger are each positioned at a right angle to
The low pressure casting technique has long been known to
produce high quality aluminum castings, but the process has also
been plagued by some persistent problems. Many of these problems can
be eliminated through the use of an electromagnetic pump as opposed
to the standard pressurized furnace.
The present demand for greatly improved productivity and quality
of aluminum castings has brought many developments and continues to
force critical evaluation of our manufacturing processes. Handling
and pouring of molten metal are two areas where new ideas are being
introduced to achieve these goals.