The inductive heating of the feedstock material is a very important step in the processing
of semi solid metals. On the one hand, the billet has to be heated as fast as possible to the target
temperature. On the other hand, it must be guaranteed that the outer area does not begin to melt
prematurely. Also, at the end of the heating the billet should have an uniform temperature
distribution in order to obtain good forming results. A flatness based control will be presented to
calculate the induced power over time trajectory from a desired trajectory for the temperature in the
middle of the billet. The temperature trajectory has to be chosen so that the billet has the desired
temperature behaviour. Experimental results will be shown for the flatness based inductive heating
of X210CrW12 just below the semi solid state.
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