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Due to the high cutting speeds and depths of modern milling machines vibrations are generated within the whole machine structure. These vibrations lead to a poor machined surface and an additional load for all machine components. Within the collaborative research centre 368 “Autonomous Production Cells”, IFAS is involved in the development of an active spindle bearing unit which is capable of damping vibration without reducing milling efficiency [7]. The special layout of the “three cavity ring” results in a high dynamic and stiffness, little need for space and a possible displacement of five tenth of a millimetre. A zero-leakage design is very important for the performance of the actuator. Reducing the leakage of the actuator will increase the dynamic and stiffness of the drive. Using a micro controller for controlling the bearing unit leads to a decentralised system with local intelligence, that can be integrated into a milling machine.

MITITGATION OF MACHINE VIBRATION BY MEANS OF AN ACTIVE SPINDLE BEARING UNIT