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ORGANIZER;CN=ESTAD 2023:mailto:info@metec-estad.com
LOCATION:Room 26
SUMMARY:Chatter management at cold rolling mills today: Long-term experience of active chatter damping
DESCRIPTION:In cold rolling mills vibrations of mechanical parts and/or strip can interfere several quality parameters like thickness, shape or surface quality. Since vibrations tend to occur at higher speeds, the rolling speed of single- or multi-stand mills for steel and aluminum has to be limited quite often.

Among other mechanisms at cold rolling mills the so-called 3rd Octave and 5th Octave Chatter are the most important vibration issues. They are introduced by explaining related mechanisms and showing results of operational measurements. Subsequently some well-known measures against chatter issues and their consequences are listed and explained, like online Chatter monitoring with Auto-Slow-Down (ASD-) functionality.

After giving a general survey about vibration issues in cold rolling mills and related conventional counter measures, the paper focusses on the development of SMS group to counteract 3rd Octave Chatter. The so-called X-Pact® Active Chatter Damping (ACD) uses Piezo electric elements as actuators which are located in an actuator box placed underneath the bottom backup roll chocks of a mill stand. A first pilot unit was put into operation in 2017 in a four-stand aluminium tandem cold rolling mill from SMS group. The optimization of the system and its integrated force measurement, including related tests and improvements to the mechanical design, was completed by April 2018. Permanent operation of the system is ongoing until today. 
The paper provides an overview of various operating results of the system during its normal operation. These are showing the reduction of vibration amplitudes and the increase of rolling speed with an active system. Beside of this, also the behavior of the system in the context of different vibration and excitation mechanisms is shown by practical examples.
The parallel product development, with focus on product series implementation and improvements regarding performance and durability, is already applied in the actually sold applications.


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DTEND:20230614T102000
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