Patent ID: 6476575
Filing Date: 2002-11-05
Classification: G05B,Y10T

Abstract:
A method of adaptively controlling a turning operation performed on a workpiece by a turning tool, by controlling an adjustable input operation parameter F of the movement of the turning tool relative to the workpiece, to maintain an output operation parameter &Dgr;M substantially at a predetermined value &Dgr;Mo and thereby to substantially compensate the variation of said output operation parameter &Dgr;M caused by the variation of at least one operation condition B=B(t) varying in time, the method comprising the steps of:(a) measuring a current value &Dgr;Mc of the output parameter &Dgr;M, (b) estimating the relation between &Dgr;Mc and &Dgr;Mo by multiplying &Dgr;Mc by a correction coefficient K which comprises an invariant correction coefficient component Ko inversely proportional to &Dgr;Mo, and (c) determining a value Fc to which the input operation parameter F should be adjusted, as a function of K&Dgr;Mc; characterized in that (d) said correction coefficient K comprises a varying correction coefficient component whose current value Kc changes in accordance with the variation of said operation condition B=B(t), the step (b) further comprising calculating the current value Kc and calculating K=Æ’(Ko,Kc).