METHOD FOR CONTROLLING TEMPERATURE ADJUSTMENT SYSTEM OF MACHINE

摘要

A method for controlling a temperature adjustment system of a machine tool is provided. With the method, a temperature rise value ΔTk of a main spindle device after stopping of rotation of a main spindle is obtained by using a reference temperature measured by a machine body temperature sensor mounted in a portion other than the main spindle device of a machine tool to calculate an estimated temperature yk. Therefore, as compared to a conventional method based only on a temperature of a cooling medium, supply of the cooling medium by a cooling device can be stopped or an operation of the cooling device can be switched from a first mode to a second mode without deteriorating machining accuracy in the main spindle device, thereby efficiently reducing power consumption.

主权项

1. A method for controlling a temperature adjustment system of a machine tool, the temperature adjustment system including: a medium supply and collection device for supplying, a medium having a temperature to be adjusted, to a structural member of the machine tool, and collecting, the medium having a temperature to be adjusted, from the structural member; and a temperature adjusting device for adjusting a temperature of the medium having a temperature to be adjusted, the method comprising:
a first step of
measuring a structural-member temperature that is a temperature near a first portion in the structural member, after stopping of a machining operation that causes temperature change of the medium having a temperature to be adjusted, the first portion contributing to the temperature change of the medium having a temperature to be adjusted and being deformed due to the temperature change of the medium having a temperature to be adjusted,measuring a reference temperature that is a temperature of a second portion, in the machine tool, which is not involved in the temperature change of the medium having a temperature to be adjusted, and which is not deformed due to the temperature change of the medium having a temperature to be adjusted, andobtaining a temperature change value based on the structural-member temperature and the reference temperature; a second step of obtaining an estimated temperature of the first portion based on the temperature change value; and a third step of determining, based on the estimated temperature, whether or not at least one of an operation of the temperature adjusting device and an operation of the medium supply and collection device is stopped, or whether or not at least one of an operation of the temperature adjusting device and an operation of the medium supply and collection device is switched from a first mode representing a normal operation to a second mode in which power consumption is less than that in the first mode.