Electronic Resource
s.l. ; Stafa-Zurich, Switzerland
Solid state phenomena
Vol. 141-143 (July 2008), p. 121-126
ISSN:
1662-9779
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Physics
Notes:
Inductive re-heating of billets is the state-of-the-art method to enable the desired liquidfraction for thixoforming. In laboratory experiments the temperature might be directly controlledsince it is usually possible to apply thermocouples for temperature measurements. Due to technicalrestrictions temperature measurements especially in the interior of a billet are difficult in industrialheating processes. For this reason, thixoforming billets are heated without temperature monitoringby using proven heating functions. Such functions are usually obtained by trial-and-error or on thebasis of FEA simulations. In both cases exhaustive experimental work is usually necessary. Moreover,FEA simulations require thermo-physical material data that is difficult to obtain for industrialrelevant heating processes.In this paper an alternative method of experimentally obtaining optimized heating functions by usinga fuzzy logic controller is introduced. Under steady-state environmental conditions this methodallows a quick and reproducible re-heating. The main advantages of the fuzzy logic based approachare that no specific material data is required, system specific properties such as the efficiency havenot be explicitly determined and that the practical implementation could be realized with a minimumof experimental work
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/24/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.141-143.121.pdf
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