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US 11,378,937 B2Granted
Numerical controller for controlling acceleration and deceleration of spindle feed rate
AssigneeFanuc Corporation
InventorsYuu Oota, Masaru Kuroiwa
Life of this patent
Estimating the term…
Abstract
A numerical controller decelerates a spindle feed rate in a bite portion to a bite velocity lower than a commanded feed rate when drilling is carried out and then, after passage through a velocity recovery point where a measured spindle load is made substantially constant, accelerates the spindle feed rate from the bite velocity to the commanded feed rate.
Claims8
A numerical controller comprising:
- an acceleration/deceleration start position calculation unit that, in response to the numerical controller determining that a drill bit is approaching a predetermined bite portion of a workpiece, decelerates a spindle feed rate to a bite velocity lower than a commanded feed rate when drilling is carried out, and maintains the bite velocity throughout drilling of the predetermined bite portion;
- and
- a spindle load measurement unit that measures a spindle load, wherein
- the acceleration/deceleration start position calculation unit is further configured to accelerate the spindle feed rate from the bite velocity to the commanded feed rate in response to the numerical controller determining that the drill bit has exited the predetermined bite portion of the workpiece after passage through a velocity recovery point, the determination that the drill bit has exited the predetermined bite portion of the workpiece being made when the measured spindle load is determined to be constant.
1 more element
A method for controlling a spindle feed rate comprising:
- in response to a numerical controller determining that a drill bit is approaching a predetermined bite portion of a workpiece, decelerating, by an acceleration/deceleration start position calculation unit, the spindle feed rate to a bite velocity lower than a commanded feed rate when drilling is carried out, and maintaining the bite velocity throughout drilling of the predetermined bite portion;
- measuring, by a spindle load measurement unit, a spindle load;
- and accelerating, by the acceleration/deceleration start position calculation unit, the spindle feed rate from the bite velocity to the commanded feed rate in response to the numerical controller determining that the drill bit has exited the predetermined bite portion of the workpiece after passage through a velocity recovery point, the determination that the drill bit has exited the predetermined bite portion of the workpiece being made when the measured spindle load is determined to be constant.
Dependencies are inferred from the claim text.