| 摘要 |
A temperature measuring device measures the temperature of a main shaft as a numerical value based on the outputs from temperature sensors. A temperature recorder stores the value as time series data. When the heat-induced displacement of the main shaft is in a stationary state, a heat-induced displacement estimate computing unit estimates the displacement based on the instantaneous temperature measurement. When the displacement is in a transient state due to a change in the rotation speed of the main shaft, the computing unit estimates the heat-induced displacement of the main shaft by multiplying the elapsed time from the beginning of the transient state by the ratio of the heat-induced displacement time constant to the temperature time constant and estimating the heat-induced displacement based on the time series data of the time preceding the current time by the result of the multiplication.
|
