Tension information acquisition device, wire electrical discharge machine, and tension information acquisition method
AssigneeFanuc Corporation
InventorRyo NISHIKAWA
Life of this patent
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Abstract
A tension information acquisition device acquires tension of a wire electrode and is provided with: a back tension adjustment unit that makes the magnitude of back tension of the wire electrode zero; and an acquisition unit that acquires tension information indicating the tension on the basis of a disturbance estimate value or output torque of a feed motor when the magnitude of the back tension is zero.
Claims10
A tension information acquisition device configured to acquire tension information indicating a tension of a wire electrode of a wire electrical discharge machine,
- wherein the wire electrical discharge machine includes:
- a wire bobbin around which the wire electrode is wound;
- a feed roller configured to feed the wire electrode reeled out from the wire bobbin, in a feeding direction by rotation of the feed roller;
- a feed motor configured to control the rotation of the feed roller;
- and a torque motor configured to generate, on the wire electrode, a back tension in a direction opposite to the feeding direction by controlling a rotational torque applied to the wire bobbin,
- the tension information acquisition device comprising:
- a back tension adjustment unit configured to control the torque motor to thereby reduce the rotational torque until a magnitude of the back tension of the wire electrode becomes zero;
- and
- an acquisition unit configured to acquire the tension information indicating the tension of the wire electrode, based on an estimated disturbance value of the feed motor or an output torque thereof, obtained when the magnitude of the back tension is zero.
A tension information acquisition method for acquiring tension information indicating a tension of a wire electrode of a wire electrical discharge machine,
- wherein the wire electrical discharge machine includes:
- a wire bobbin around which the wire electrode is wound;
- a feed roller configured to feed the wire electrode reeled out from the wire bobbin, in a feeding direction by rotation of the feed roller;
- a feed motor configured to control the rotation of the feed roller;
- and a torque motor configured to generate, on the wire electrode, a back tension in a direction opposite to the feeding direction by controlling a rotational torque applied to the wire bobbin,
- the tension information acquisition method comprising:
- a back tension adjustment step of reducing the rotational torque of the torque motor until a magnitude of the back tension of the wire electrode becomes zero;
- and
- an acquisition step of acquiring the tension information indicating the tension of the wire electrode, based on an estimated disturbance value of the feed motor or an output torque thereof, obtained when the magnitude of the back tension is zero.
Dependencies are inferred from the claim text.