Vyatka State University, Kirov, Russia:

M. Z. Pevzner, Professor, e-mail: mikhailpevzner@yandex.ru

This paper considers a relationship between the transverse profile of the L68 and L63 brass band and the profile of the blank subjected to transverse flux induction heating (TFIH) and the distribution of properties across the blank, which can be controlled by changing the width of the blank versus the width of the induction heater. A three-phase line-frequency induction heater was used for intermediate TFIH treatment. Such heater consists of two modules, each of which constitutes a separate induction heater comprising two halves situated on both sides of the band and creating opposite magnetic poles in the opposite teeth of the magnetic core. The two halves have compensated windings, i.e. windings with the opposite succession of the phases. Due to this, the magnetic fields travel in the opposite directions and the axial forces completely compensate each other. A common delta network is used. The following process included cold rolling on a four-high rolling mill without using the roll bending system. The back-up rolls have a cylindrical profile while the work rolls have a crown of +0.02 mm. It was found that the heterogeneity of properties in the blank, i.e. a softer centre versus the edges, lessens or prevents the crown altogether in the following rolling operation irrespective of the prior processing or the type of material. At the same time, no compromised flatness was observed when the band was subjected to high strain passing through the stand with 250 mm work rolls. It is shown that the ratio between the width of the induction heater and the width of the blank serves as one of the factors that define the transverse heterogeneity of the mechanical properties after TFIH treatment and — indirectly — the transverse profile of the rolled band. Effective utilisation of the edge effect occurring in the process of TFIH treatment delivers a unique additional opportunity to control the profile of the finished rolled products.

1. Blinov K., Galunin S., Nikanorov A., Zimakova A., Nacke B. Dynamics of electrothermal processes for cut or welded strips in the induction through-heaters. Proceedings of the 2016 IEEE North West Russia Section Young Researchers in Electrical and Electronic Engineering Conference, EIConRusNW 2016. Saint Petersburg, 2016. pp. 508–512.
2. Yermekova M., Galunin S. A. Numerical simulation and automatic optimization of the disk induction heating system. Proceedings of the 2017 IEEE Russia Section Young Researchers in Electrical and Electronic Engineering Conference, ElConRus 2017. Saint Petersburg, 2017. pp. 1085–1090.
3. Pevzner M. Z., Shirokov N. M., Khayutin S. G. Continuous induction heat treatment of strips and bands. Moscow : Metallurgiya, 1994. 128 p.
4. Demidovich V. B., Rastvorova I. I., Sitko P. A. Advanced Induction Heating Of Thin Plate Products. ActaTechnica CSAV (Ceskoslovensk Akademie Ved). 2014. Vol. 59, No. 3. pp. 291–301.
5. Nikanorov A. et. al. Investigation, design and optimization of transverse flux induction heaters. Proceedings of the International Seminar on Heating by Internal Sources. Padua, 12–14 September 2001. pp. 553–558.
6. Youhua Wang et al. Two Novel Induction Heating Technologies: Transverse Flux Induction Heating and Travelling Wave Induction Heating. Advances in Induction and Microwave Heating of Mineral and Organic Materials. Intech, 2011. pp. 181–206.
7. Bukanin V., Dughiero F., Lupi S., Zenkov A. Edge Effects in Planar Induction Heating Systems. Proceeding of the International Seminar on Heating by Internal Sources. Padua, 12–14 September 2001. pp. 533–538.
8. GOST 2208–2007. Brass foil, ribbons, strips, sheets and plates. Specifications. Introduced: 01.07.2008.

9. Silnikova E. F., Silnikov M. V. Crystallographic texture and texture formation. Saint Petersburg : Nauka, 2011. 560 p.
10. Shevelev V. V., Yakovlev S. P. Anisotropy of flat steel and its effect on drawing. Moscow : Mashinostroenie, 1972. 135 p.
11. Serebryanyy V. N. Analysis of earing in aluminium alloys under deep drawing conditions. Zavodskaya laboratoriya. 1995. Vol. 61, No. 3. pp. 15–18.
12. Mannanov E., Galunin S., Blinov K. Numerical optimization of transverse flux induction heating systems. Proceedings of the 2015 IEEE North West Russia Section Young Researchers in Electrical and Electronic Engineering Conference, ElConRusNW 2015. Saint Petersburg, 2015. pp. 241–244.
13. Zhang Y. H., Chen Y. J. Magneto-Thermal Simulation Analysis of the Sheet Metal in the Transverse Flux Induction Heating Process. Applied Mechanics and Materials. 2014. Vol. 644–650. pp. 4960–4963.
14. Pevzner M. Z. Process techniques for improving the homogeneity of properties in rolled steel annealed in transverse magnetic field. Tsvetnye Metally. 2019. No. 5. pp. 81–88.
15. Shirokov N. M., Luzhbin A. S., Pevzner M. Z., Krutilin V. A., Avdyushkin O. A., Tokareva T. Yu. Method of controlling temperature along strip width at heat treatment. Patent RF, No. 2071991. Applied: 08.12.1993. Published: 20.01.1997.
16. Pevzner M. Z. Temperature and property distribution over the width of a strip annealed in a transverse magnetic field. Metal Science and Heat Treatment. 2010. Vol. 52, Iss. 7-8. pp. 382–387.
17. Salganik V. M., Meltser V. V. Computer analysis of strains and loads in a four-high mill stand. Sverdlovsk : Izdatelstvo UPI, 1987. 78 p.
18. Sinitskiy O. V., Poletskov P. P. Elements of modern processing systems for ensuring the geometry and shape of flat rolled steel. Kalibrovochnoe byuro. 2015. No. 6. pp. 72–99.
19. Zaykov M. A., Polukhin V. P., Zaykov A. M., Smirnov L. N. The process of rolling. Moscow : MISiS, 2004. 640 p.
20. Tretyakov A. V., Rumyantsev M. I., Kinzin D. I. Theory of rolling. Magnitogorsk : Nosov Magnitogorsk State Technical University, 2017. 188 p.
21. Kobzar A. I. Applied mathematical statistics. For engineers and researchers. Moscow : Fizmatlit, 2012. 816 p.
22. Kozlov A. Yu., Mkhitaryan V. S., Shishov V. F. Statistical analysis of data in MS Excel. Moscow : Infra-M, 2012. 320 p.