Autoresonant control of ultrasonically assisted cutting

The paper describes the development of an autoresonant system with supervisory computer control, which was successfully used for the control of piezoelectric transducer during ultrasonically assisted turning. This permits an intensive supply of ultrasonic energy into the machining zone in conditions of variable cutting loads. The effect is achieved through the generation and maintenance of the nonlinear resonant mode of vibration and by active matching of the oscillating system with the dynamic loads imposed by the cutting process. The system has been developed as combined analog-digital, where analog devices process the control signal, and the parameters of the devices are controlled digitally by computer. The supervisory control provides the most efficient excitation of the vibrating system and keeps the stable level of vibration under the application of the dynamic cutting loads. (C) 2003 Elsevier Ltd. All rights reserved.