Parameter adaptive control in peripheral milling

Various parameter adaptive control strategies are applied to the problem of regulating the cutting force in peripheral milling under varying cutting conditions. The dynamics of the relationship between feed rate and cutting force are represented by a first order linear model which includes the effect of spindle stiffness on the mechanics of chip formation.The relationship is further expressed in the form of the Hammerstein model to include the nonlinearities in the force behaviour, particularly at low feed rates. The performance of the corresponding nonlinear controller is analyzed.The main contribution of this work is the application of theoretically based strategies and structures for parameter adaptive control in peripheral milling which can be readily implemented using available microprocessor technology. These strategies are shown to be stable with good performance characteristics over the full range of operating conditions.