Increasing the stability limits of turning processes by using digital control

Abstract

This article deals with the application of digital force control to the turning process. Two control methods are presented which increase the maximum allowable chip width while avoiding the occurrence of regenerative chatter. The first control method is a PD control where the gains P and D are determined to stabilize an associated linear system. The second method is a predictive control strategy based on the minimization of an intuitive cost functional on a finite time interval. Results are presented for a particular turning system model using numerical simulations.