APPLICATIONS OF SELF-TUNING CONTROL ON INDUSTRIAL CNC MACHINES

Abstract

Most successful applications of parameter adaptive control to obtain constant cutting forces in machining processes have been limited to laboratory environments. This paper presents a methodology for realizing efficient adaptive control algorithms in industrial CNC machines. Experimental results concerning the fixed gain integral control and variable gain MRAC show that the present set-up in a heavy-duty CNC machining center leads to predictable control behavior. Furthermore, two effective algorithms-a deadbeat self-tuning control with increased order and a PID-type self-tuning control based on the pole-placement method-are implemented to obtain more effective cutting control performance. In this study, repeatable and satisfactory experimental results show that the technique developed here for real manufacturing processes is feasible.