Analysis of the energy efficiency and control ability under different magnetic flux forms in RPECT

Abstract

Roll profile electromagnetic control technology (RPECT), which has the flexible control ability of the roll profile, is a new roll gap control technology that can be applied in the cold rolling process. The electromagnetic stick (ES) is generally used as the main bulging driving to adjust the roll profile. However, the ES structure can be changed with the variation of the electromagnetic flux forms, which further results in the difference of the energy efficiency and control ability. In this paper, the transverse magnetic flux form (TMF) and longitudinal magnetic flux form (LMF) of RPECT are proposed, and the principles of TMF and LMF are analyzed, and their advantages in the heat transfer paths are discussed. To conduct the parameterized impact analysis, the electromagnetic-thermal-structural coupled model matching the two electromagnetic flux forms are established and verified. Through the analysis of the current density, the current frequency, the external cooling and the initial roll temperature, the results show that the variation of the current densities, the current frequencies or the initial roll temperatures can change the control ability of RPECT, while changing the external cooling can not affect that of RPECT. The energy efficiency intersection of TMF and LMF can be achieved by changing the current density or current frequency separately. However, compared with changing the current frequency, increasing the current density of TMF to two times of LMF at different initial roll temperatures can realize the energy efficiency intersection of TMF and LMF, which is the best way to achieve this goal.