Design of Real-Time Compensation of Thermal Error of CNC Machine Screw and Automatic Compensation Test
In order to reduce the positioning error caused by thermal error in the screw drive system of CNC machine tools,the real-time compensation of the machine tool table in each running stage is completed.With non-contact mode for the screw non-motor connection end of the installation of displacement detectors,eddy current sensor time monitoring of the screw end face position data,to obtain the total thermal error generated by the screw,through thermal compensation to get the degree of thermal error in each segment of the screw,to determine the offset of the origin of the coordinate system occurs in each segment,to complete the effect of autonomous compensation of thermal error in machine tool screws.The results of the study show that the segment compensation method can obtain a better performance of full-segment compensation of the screw than other thermal error compensation models.Detecting the thermal errors occurring in each segment of the screw separately and then compensating them can be implemented according to the degree of thermal error in each part of the screw.
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