Machine tool and standby time changing method
AssigneeFanuc Corporation
InventorHiroki Tezuka
Life of this patent
Estimating the term…
Abstract
A machine tool is equipped with a rotary table, and a clamp mechanism which clamps the rotary table in a manner so that the rotary table does not rotate. A clamping operation by the clamp mechanism is started after a standby time has elapsed from completion of indexing of the rotary table. The machine tool further includes a positional deviation calculating unit adapted to calculate a positional deviation of the rotary table when the clamping operation by the clamp mechanism is completed, and a standby time changing unit adapted to shorten the standby time in the case that an absolute value of the positional deviation is less than a threshold value, and to lengthen the standby time in the case that the absolute value of the positional deviation is greater than the threshold value.
Claims6
A machine tool comprising:
- a rotary table adapted to support an object to be machined and which is capable of being rotated;
- and
- a clamp mechanism adapted to clamp the rotary table in a manner so that the rotary table does not rotate;
- wherein a clamping operation by the clamp mechanism is started after a standby time has elapsed from completion of indexing of the rotary table;
- the machine tool further comprising:
- a positional deviation calculating unit adapted to calculate a positional deviation of the rotary table when the clamping operation by the clamp mechanism is completed;
- and
- a standby time changing unit adapted to shorten the standby time in the case that an absolute value of the positional deviation is less than a threshold value, and to lengthen the standby time in the case that the absolute value of the positional deviation is greater than the threshold value,
- wherein the standby time is set to be, as an initial value, longer than a time period required for overshooting to converge.
A standby time changing method for changing a standby time of a machine tool comprising:
- a rotary table adapted to support an object to be machined and which is capable of being rotated;
- and
- a clamp mechanism adapted to clamp the rotary table in a manner so that the rotary table does not rotate;
- wherein a clamping operation by the clamp mechanism is started after the standby time has elapsed from completion of indexing of the rotary table;
- the standby time changing method comprising:
- a positional deviation calculating step of calculating a positional deviation of the rotary table when the clamping operation by the clamp mechanism is completed;
- and
- a standby time changing step of shortening the standby time in the case that an absolute value of the positional deviation is less than a threshold value, and lengthening the standby time in the case that the absolute value of the positional deviation is greater than the threshold value,
- wherein the standby time is set to be, as an initial value, longer than a time period required for overshooting to converge.
Dependencies are inferred from the claim text.