Modified tool structures for effective cutting
Keywords: flexible structures, vibration modes, vibro-impact motion
AbstractThe main idea of the reported research work is based on treating cutting tool as a flexible structure characterized by several modes of natural vibrations, structural modification of which leads to the self-excitation of higher vibration modes during cutting. The intensification of the higher natural vibration modes results in higher frequencies and lower vibration amplitudes of cantilever type cutting tools generating vibration cutting effect, that gives the better quality of the treated surface. Consequently the intensification of the higher modes increases the magnitude of internal energy dissipation inside tool material and thereby makes the tool, without any passive vibration absorber, a more effective damper, which positively influences the amplitudes of workpiece or machine tool itself, providing the possibility to reduce chatter. Increase in cutting effectiveness related with the intensification possibility of cutting regimes avoiding the tool-workpiece resonance zones.
DYNAMICS OF MECHANICAL SYSTEMS