METHOD AND APPARATUS FOR COMPENSATING THERMAL DISPLACEMENT OF MACHINE TOOL

摘要

Disclosed are a method and an apparatus for compensating thermal displacement of a machine tool, the apparatus including: a compensation quantity calculating unit configured to calculate a compensation quantity by using temperature data and a predetermined compensation parameter; a smoothing filter configured to exponentially smooth the calculated compensation quantity; a scaling unit configured to scale the exponentially smoothed compensation quantity; a time-dispersion compensating unit configured to calculate a final compensation quantity by time-dispersion compensation for the scaled compensation quantity according to a time-dispersion compensating period; and a control unit configured to compensate each axis of equipment according to the final compensation quantity, and adjusts the time-dispersion compensating period of the time-dispersion compensating unit according to an error absolute value representing a difference between an input value and an output value of the time-dispersion compensating unit.

主权项

1. An apparatus for compensating thermal displacement of a machine tool, the apparatus comprising:
a compensation quantity calculating unit configured to calculate a compensation quantity by using temperature data and a predetermined compensation parameter; a smoothing filter configured to exponentially smooth the compensation quantity calculated by the compensation quantity calculating unit; a scaling unit configured to scale the compensation quantity exponentially smoothed by the smoothing filter; a time-dispersion compensating unit configured to calculate a final compensation quantity by time-dispersion compensation for the compensation quantity scaled by the scaling unit according to a time-dispersion compensating period; and a control unit configured to compensate each axis of equipment according to the final compensation quantity calculated by the time-dispersion compensating unit, in such a manner in which when an error absolute value representing a difference between an input value and an output value of the time-dispersion compensating unit is equal to or larger than a predetermined threshold parameter, the control unit adjusts the time-dispersion compensating period of the time-dispersion compensating unit according to the error absolute value.