Evolutionary compensation method for spindle rotation error of computer numerical control grinding machine based on timing in-situ measurement

An evolutionary compensation method for a spindle rotation error of a computer numerical control CNC grinding machine based on timing in-situ measurement, comprising the following steps:

• S1, fixing a spindle rotation error in-situ measuring device of the CNC grinding machine on the CNC grinding machine, determining a plurality of feature points at an edge of a central hole of a spindle, and aligning the spindle rotation error in-situ measuring device of the CNC grinding machine with the edge of the central hole of the spindle;
• S2, when the CNC grinding machine is in an operating state, acquiring a trajectory image of the feature points at the edge of the central hole of the spindle by using the spindle rotation error in-situ measuring device of the CNC grinding machine;
• S3, obtaining a measured value of the spindle rotation error by calculation according to the trajectory image of the feature points at the edge of the central hole of the spindle;
• S4, fusing features of the spindle rotation error of the CNC grinding machine with the measured value of the spindle rotation error;
• establishing a spindle rotation error compensation model of the CNC grinding machine, by which a spindle rotation error compensation value is output;
• and compensating the spindle rotation error of the CNC grinding machine according to the spindle rotation error compensation value;
• S5, repeating S2-S3, obtaining the measured value of the spindle rotation error by calculation, calibrating the spindle rotation error compensation model of the CNC grinding machine at current time by using a current measured value of the spindle rotation error and updating the spindle rotation error compensation model, and obtaining a latest spindle rotation error compensation value;
• S6:
• repeating S5, and constantly calibrating and updating the spindle rotation error compensation model of the CNC grinding machine, so as to realize continuous optimization and compensation of the spindle rotation error of the CNC grinding machine.