EUROPEAN STEEL TECHNOLOGY AND APPLICATION DAYS 2017 - ESTAD 2017

In hot and cold rolling mills self-exited vibrations are a very common problem. These vibrations lead to chatter marks on rolls and strip, if no countermeasures are applied. Usually rolling speed is reduced significantly in an automated way, each time self-exited vibration comes up. A reduced productivity is always the result. A new actuator is presented in this paper that allows the active damping of vibrations. This can be done at full production speed. Therefore the flat bearings of mill housing are replaced by new adaptronic flat bearings which can adapt their thickness. In case of self-exited vibrations the roll chocks are pressed automatically to the mill housing in a coordinated way, which increase the damping and thus self-exited vibrations are eliminated. This approach is useful especially for existing mills. This paper presents results of a prototype in a special vibration testbed. The general function of the adaptronic flat bearing and its capability to damp self-exited vibrations are shown.