Abstract
Based on the application requirement of online measurement and evaluation for roundness error of precision machine tool spindle, a specific method is proposed to fit the spindle roundness error based on the least square method according to the characteristics of the roundness error. Firstly, aiming to the radial vibration displacement signal of spindle, which collected by the sensor, a multi-harmonic signal with speed frequency of spindle as the fundamental frequency is constructed, and then the least square method is used to fit the amplitudes and phases of each harmonic signals. Finally, according to the fitting results, the rotation error and the interference of higher-order noise signals are eliminated, and the contour signal with only roundness error of the spindle is reconstructed, and then the roundness error of the spindle is evaluated by appropriate evaluation method. The simulation system of rotation and roundness errors separation for spindle system is developed, and the feasibility and accuracy of least square method to fit the spindle roundness error are verified by simulation analysis.
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