Adaptive Control of Regenerative Chatter in Turning Process With Tool Wear Effect

Chatter suppression is of great importance for achieving high precision and surface quality in machining processes. A single degree of freedom model of orthogonal turning process is used to set up the nonlinear delay differential equation of motion. Tool wear effect is considered as the contact force between the workpiece and tool flank surfaces. Uncertainties in parameters of dynamic model and machining conditions are included in the model. An adaptive control strategy is applied for chatter suppression in cutting process. The force provided by a piezo-actuator is the control input of the system. Results of stability analysis and adaptive control for two distinct cases of sharp and worn tools are presented and compared.