Due to the inconsistency between the linear interpolation of CNC system and the actual tool path in multiaxis CNC machining

the nonlinear error is caused. In this study

the nonlinear error model is established to predict the position of the maximum nonlinear error

the parabola function method is used to further optimization the error model by analyzing the curve fitting degree

and the influence factors of nonlinear error are analyzed. The overerror program segment is controlled within the allowable value of error by adaptive linearization method. Taking the six-axis and five-linkage CNC machining of blade surface with disk knife as an example

the tool position file is simulated and analyzed. The nonlinear error of sampling program section is obviously improved after control

and the standard deviation of maximum nonlinear error is reduced by nearly 84.5%. The effectiveness of the above control method is verified.