Iterative Learning Control Method And Application For Electro-slag Furnace

After many years of practice and development, electro-slag re-melting furnace in steel has got significant progress.The technological has evolved to a wide range. As re-melting improved the elements, which made greatly improved the quality of metal to achieve the purpose of energy saving and emission reduction, economic efficiency is high, now it has been widely used in industrial production, especially special steel processing. So how to apply appropriate control methods to create the optimal control system to ensure the stability of the re-melting process and reliability is very important.This paper first briefly introduced the history of development electro-slag re-melting method, the status quo the control, the classification of electro-slag furnace and mold, and compared several types of electro-slag furnace and mold. Then a brief introduction to the great influence on the quality of steel ingot re-melting slag material in the role of electro-slag re-melting process and the quality of slag composition on the impact of melting. The hardware components of electro-slag furnace, including start-slagging, normal melting, hot cap and so on has been mentioned.The dual-closed-loop control methods for a normal melting process has been put forward at last. Outer ring formed by melting quality measurement speed feedback loop, inner loop for the current feedback loop. Outer loop for the current amendment to the given value so as to provide a more rational inner given current, inner current-deviation increase from the very basic feed consumption rate of PID correction algorithm, the basic rate of melting theory, according to calculations by the model to be. Because the basic rate is not accurate enough, according to the batch melting characteristics of proposed amendments based on iterative learning algorithm for PID. Through iterative learning, the accuracy of the base rate has been gradually improved,become the best value, that could ease the burden of double close-loop adjustment, so that re-melting process is more stable, improve the quality of re-melting metal.This paper take ingot and mold and mold are fixed length electro-slag furnace of a special mold steel factory as the background to study the application of new control methods, the production process than the original current loop a single control, and a simple double-loop control has improved significantly, re-melting is vaorc stable and achieved good application effect.