10.14489/td.2017.12.pp.024-029

2017, 12 December

DOI: 10.14489/td.2017.12.pp.024-029

Savin I. S., Slavinskaya E. A., Terekhin I. V.
EDDY CURRENT TESTING OF THE METAL LEVEL IN THE CRYSTALLIZER USING A SCREEN-TYPE CONVERTER
(pp. 24-29)

Abstract. The properties of the screen eddy current transducer of the metal level position in the mold crystallizer are investigated in the article. A transmission probe consists of the exciting coil and array of pick-up coils that are located on opposite mould’s walls. The design of probe allows testing directly molten metal in the mould, however detuning the wall’s heat is required. According to the results of the laboratory experiment possibility of the directly molten metal’s testing is confirmed. In addition, an exciting frequency providing the highest signal-to-ratio is selected. An interdisciplinary numerical model of the billet mould with the transmission eddy current probes was built. Based on modeling results hodographs from molten metal, mould’s temperature changes and overall hodograph under the influence of both factors simultaneously are received. The overall hodograph is non-linear and it can’t be represented as sum of hodographs from metal and mould temperature. One of the differentiation methods is the two-frequency excitation, for which it is necessary to choose frequencies for testing temperature and level of metal separately. Besides, it is offered to apply distribution of signals from the oscillation of the mould for testing the molten metal level.

Keywords: eddy current testing, continuous steel casting, mould metal level probe.

+ - About the Authors Click to collapse

I. S. Savin, E. A. Slavinskaya, I. V. Terekhin (National Research University “Moscow Power Engineering Institute”, Moscow, Russia) E-mail: Данный адрес e-mail защищен от спам-ботов, Вам необходимо включить Javascript для его просмотра. , Данный адрес e-mail защищен от спам-ботов, Вам необходимо включить Javascript для его просмотра. , Данный адрес e-mail защищен от спам-ботов, Вам необходимо включить Javascript для его просмотра.

+ - References Click to collapse

1. Terekhin I. V. (2008). Development of eddy current testing means for monitoring the level of liquid metal in a sleeve mold during the continuous casting of steel. PhD thesis. Moscow. [in Russian language]
2. Mörmann J., Schmid S., Spagnul. (2011). Recent progress in fast and accurate meniscus level measurement for continuous casting machines. Proc. 7th European Continuous Casting Conference (ECCC) 2011, 27 June – 1 July 2011, Dusseldorf.
3. Ermolov I. N., Ostanin Iu. Ia. (1988). Methods and means of non-destructive quality control: a manual for engineering and technical special universities. Moscow: Vysshaia shkola. [in Russian language]

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