SIROLLCIS CM Active Chatter Damping    System for operation of a 3rd octave chatter free tandem cold mill

The SIROLLCIS CM Active Chatter Damping system is dedicated to actively damp 3rd octave vibrations by a specifically designed high-speed servo-valve to realize the "Operation of a 3rd octave chatter-free mill"

Tandem cold mill The challenge Operation of a “3rd octave chatter free mill“ – Liberation of your production from yield limitations due to rolling speed limitations for chatter–critical steel grades – Avoidance of active (emergency) rolling speed reductions due to beginning of 3rd octave chatter which reduce the throughput of the mill.

Our solution

The system eliminates chatter completely within a mill’s operating range, thus making it possible to run a tandem mill at its full limits without 3rd octave chatter. The active chatter damping system is consistently designed as a completely integrated mechatronic solution. The active chatter damping servo valve and the hydraulic roll-force cylinder represent a functional unit, since direct attachment onto the hydraulic cylinder is required in order to avoid delays imposed by the transport time of oil in pipes. A decentral independent controller is 100 % modular with quality-assured robust and pretested components which build a functional unit. The hydraulic roll-force cylinder was chosen as the location for injecting damping. With a nonlinear controller that uses acceleration and pressure measurements as inputs, an additional active chatter damping servo-valve is actuated. The controller action of the active chatter damping system is sharply limited around the chatter frequency. Thus there is a very clear frequency separation between an AGC controller and the active chatter damping system. The actuator now meets the essential requirements as follows: • Frequency range up to 150 Hz • Phase shift maximum 30°–50° • Nominal flow rates of 300 l/min

Good reasons for SIROLLCIS CM Active Chatter Damping

Increase of yield - no speed reduction for chatter critical steel grades

Overall vibration reductions of mechanical components

Cost savings in respect to yield increase and also protection of mechanical equipment due to strip breaks

Short pay-back periods