| 摘要 |
PROBLEM TO BE SOLVED: To improve the cooling efficiency of a heat generating section by a coolant, highly accurately estimate thermal displacement quantity of the heat generating section and accurately correct the positions of a main spindle and tool based on the estimated thermal displacement quantity. SOLUTION: The spindle head 20 of a machining center allows the coolant sent out a cooling device 18 to circulate in the spindle head 20. The coolant before passing near a heat generating section branches into a cooling passage (pipe 19b, cooling circulation area 7 and pipe 19b) and a temperature measuring passage (pipe 19c, measuring circulation area 9 and pipe 19e), and a restrictor 12 is provided upperstream of a position near the heat generating section of the pipe 19c. The temperature of the coolant before and after passing the heat generating section are detected by the temperature sensors 10 and 11 provided in the pipes 19a and 19e, and based on the temperatures detected, the thermal displacement quantity of the heat generating section is estimated to correct the position of a attachment spindle 4.
|
