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METAL PROCESSING
ArticleName Precision heating of cylindrical nonmagnetic blanks in inductor before the forming
DOI 10.17580/tsm.2016.01.13
ArticleAuthor Demidovich V. B., Rastvorova I. I.
ArticleAuthorData

Saint Petersburg Electrotechnical University “LETI”, Saint Petersburg, Russia:

V. B. Demidovich, Professor, Chief Researcher (Inter-Branch Laboratory “Modern Electrotechnologies”), e-mail: vbdemidovich@mail.ru

 

National Mineral Resources University, Saint Petersburg, Russia:
I. I. Rastvorova, Assistant Professor of a Chair of Electronic Systems

Abstract

Problems of precision induction heating of the blanks of non-ferrous metals alloys such as titanium, zirconium, niobium, tantalum and some others are discussed. Induction heating of non-ferrous metals has some features that should be taken into account on developing the proper equipment. Because of low thermal conductivity and high thermal losses from the surface, the maximum temperature inside the blank is achieved and can’t be measured with a pyrometer. Absolutely uniform heating in inductors is unavailable even theoretically. At the same time, precision heating with high homogeneity extent of the temperature field provides high quality of nonmagnetic metals blanks plastic deformation. Determination of the minimum accessible temperature field unevenness on the blank being heating by induction method, plays an essential role in the heating technology development and induction plant designing. There is examined a complex of the factors affecting quality of the cylindrical non-magnetic blanks heating in inductors. To achieve minimum temperature gradient through the diameter and the length of the blank when heated, different construction and heating mode optimization channels are used. These include the frequency, required power and heating time selection, active and passive means of the heat sources distribution spatial adjustment. Procedure of the induction heater mode and construction is automatic optimization is elaborated. Computational modelling is an integral part of equipment designing and induction heating technology development. There is presented an example of electromagnetic and temperature field calculation under the zirconium blank optimum heating in the induction periodical heater.

keywords Induction heating, optimum control, electromagnetic treatment, non-magnetic alloys, precision heating, melting, titanium alloys, zirconium alloys
References

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