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1 2013

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Avoiding chatter by means of active damping systems for machine tools

Brecher C., Baumler S., Brockmann B.

Journal of Machine Engineering

2013

Vol. 13, No. 3

117--128

Chatter in machining processes is strong dependent on the dynamic compliance behaviour of the machine tool and workpiece. The critical cutting depth where chatter occurs is in inverse proportion to the absolute value of the negative real part of the complex dynamic compliance response function of the machine tool. Therefore, while designing a machine tool, its dynamic behaviour should be investigated and optimized, e.g. by using the finite element method. If further design optimization are not possible, active damping system might help avoiding chatter of the machine tool. Active damping systems can compensate the dynamic displacements between tool centre point of the machine tool and workpiece by applying dynamically correlated external energ (e.g. compensation forces) onto the machine structure. Next to an explanation of the general idea and systemizatio of active damping systems, this paper gives examples of recent research activities in the field of active damping systems for machine tools of the Laboratory for Machine Tools and Production Engineering (WZL) of Aachen University, Germany. The main challenges while designing active damping systems for machine tools are carved out.