METHOD AND SYSTEM FOR ADAPTIVE CONTROL OF TURNING OPERATIONS

An adaptive control system for adaptively controlling a turning operation performed at a work piece by a turning tool adjusts a controlled input operation parameter F to maintain an output operation parameter DELTAM substantially at a predetermined value DELTAMo to compensate variation of the output operation paramemeter DELTAM caused by the variation of at least one operation condition B=B (t). The system comprises a sensor (8) of the output operation parameter DELTAM for providing a signal Uc proportional to a current value DELTAMc and an adaptive controller (10) for determining a value Fc to which the input operation parameter F should be adjusted, as a function of kUc, where k is a signal transmission coefficient which comprises an invariant signal transmission coefficient component ko inversely proportional to DELTAMo. The adaptive controller includes an amplifier transforming the signal Uc into koUc, and an input parameter override unit controlled to adjust the controlled operation input parameter to Fc. The adaptive controller further comprises a correction processing means calculating kcUc, where kc is a varying signal transmission coefficient component whose current values depend on the variation of the operation condition B=B (t). The adaptive controller is capable of calculating k=f (ko, kc).