US 12,436,523 B2
Control device for machine tool
Kouki Oikawa, Yamanashi (JP)
Assigned to FANUC CORPORATION, Yamanashi (JP)
Appl. No. 18/549,545
Filed by FANUC CORPORATION, Yamanashi (JP)
PCT Filed Mar. 14, 2022, PCT No. PCT/JP2022/011373
§ 371(c)(1), (2) Date Sep. 7, 2023,
PCT Pub. No. WO2022/196646, PCT Pub. Date Sep. 22, 2022.
Claims priority of application No. 2021-044443 (JP), filed on Mar. 18, 2021.
Prior Publication US 2024/0152116 A1, May 9, 2024
Int. Cl. G05B 19/416 (2006.01)
CPC G05B 19/416 (2013.01) [G05B 2219/49108 (2013.01)] 2 Claims
OG exemplary drawing
 
1. A control device for a machine tool, comprising:
a fluctuation command calculation unit configured to calculate a fluctuation command based on a speed command for a main spindle motor of the machine tool and a fluctuation condition for causing a rotation speed of the main spindle motor to periodically fluctuate;
a speed control unit configured to control the rotation speed of the main spindle motor based on the speed command and the fluctuation command; and
a fluctuation stop determination unit configured to calculate a stop command for stopping a fluctuation of the rotation speed based on a predetermined trigger,
wherein the fluctuation command calculation unit being configured to calculate, when the fluctuation condition is changed, the fluctuation command in which an amplitude of the rotation speed that periodically fluctuates and/or a frequency of the rotation speed that periodically fluctuates gradually changes, and
wherein the fluctuation command calculation unit is configured to calculate, when receiving the stop command as the fluctuation condition, the fluctuation command in which the amplitude of the rotation speed that periodically fluctuates attenuates to zero.