| 摘要 |
PROBLEM TO BE SOLVED: To provide a machine tool which can execute proper thermal displacement correction even when temperature change is drastic and improve machining accuracy, and a thermal displacement correction method of the machine tool. SOLUTION: The machine tool comprises a temperature storage part 13 and a control means 11. The temperature storage part 13 stores detection values by temperature detecting means 12 arranged at a position where the temperature change of the machine body is comparatively small, at a position where the temperature change is large, and at a position where the ambient temperature of the machine can be detected. The control means 11 calculates (T0n , T1n , T2n ; n is the number of times of the temperature detection), a correction amount of each axis Hn= (ΔT1n -ΔT11 )+(ΔT1n -ΔT1(n-1)×α1 }×β1 + (ΔT2n -ΔT21 )+(ΔT2n -ΔT2(n-1) )×α2 }×β2 from the first difference (ΔT1n -ΔT11 ,ΔT2n -ΔT21 ) calculation value by the first difference calculation part 16, the second difference (ΔT1n -ΔT1(n-1) ,ΔT2n -ΔT2(n-1) ) calculation value by the second difference calculation part 18 and correction factorsα1 ,α2 ,β1 , andβ2 of a correction factor storage part 19, and sends an axis feed operation command equivalent to the correction amount Hn to a drive means 22, is in the direction for offsetting the thermal displacement.
|
