The presented work shows the design of an ultrasonic actuator that enables vibration-assisted milling and grinding with ultrasonically modulated cutting speed. The actuator system superimposes a longitudinal torsional ultrasonic oscillation to the milling or grinding tool. It uses a bolt clamped Langevin transducer and a helically slotted horn, which degenerates the longitudinal vibration into a combined longitudinal torsional (L-T) vibration at the output surface. A finite element analysis is used to determine the vibration resonance frequency and mode shapes to maximize the torsional output. Afterwards, the simulation has been experimentally validated.
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Philipp M. Rinck, Sebastian Sitzberger, Michael F. Zaeh, "Actuator design for vibration assisted machining of high performance materials with ultrasonically modulated cutting speed," Proc. SPIE 10326, Fourth European Seminar on Precision Optics Manufacturing, 103260C (15 June 2017);