Comprehensive performance evaluation method of CNC servo turrets based on accuracy retentivity theory

Repeated positioning accuracy, axial stiffness, cutting vibration, and rotation noise are key indexes that affect the comprehensive performance of computer numerical control (CNC) servo turrets. In order to evaluate the comprehensive performance of CNC servo turrets accurately, a new evaluation method is proposed based on accuracy retentivity theory in this paper. The retentivity degree evaluation methodology of performance indexes of the turret based on error threshold and 3δprinciple are proposed. Analytic hierarchy process (AHP) is used to calculate the weight of the influence degree on the turret, and the comprehensive performance retentivity degree of the turret is obtained. A comprehensive performance degradation model is established by using least squares. Finally, the comprehensive performance tracking test and analysis are conducted by taking two turrets as an example. The degradation law of the comprehensive performance retentivity degree of turrets is obtained, and the remaining performance retentivity time is predicted.

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