Wire electrical discharge machining apparatus
AssigneeMitsubishi Electric Corporation
InventorsYasuo Onodera, Takayuki Nakagawa
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Abstract
In order to detect a wire breakage as soon as possible, the wire electrical discharge machining apparatus includes a speed fluctuation compensator that generates a speed fluctuation suppression command that is a speed compensation value that suppresses fluctuation of the rotational speed of the tension motor on the basis of the rotational speed of the tension motor and a breakage detecting device that detects a breakage of the wire electrode on the basis of a comparison of a preset breakage detection threshold and a speed fluctuation suppression command output from the speed fluctuation compensator.
Claims10
A wire electrical discharge machining apparatus comprising:
- a collecting roller that collects a wire electrode;
- a collecting motor that causes the wire electrode to travel at a predetermined speed by driving the collecting roller;
- a tension roller that applies tension to the wire electrode between the tension roller and the collecting roller;
- a tension motor that drives the tension roller;
- a speed calculating unit that calculates a rotational speed of the tension motor;
- a speed fluctuation compensating unit that generates a speed compensation value that suppresses fluctuation of a rotational speed of the tension motor on a basis of a rotational speed output from the speed calculating unit;
- and
- a breakage detecting unit that detects a breakage of the wire electrode on a basis of a comparison of a preset breakage detection threshold and a speed compensation value output from the speed fluctuation compensating unit,
- wherein the speed compensation value is generated before detecting a speed difference between a wire speed at the tension roller and a wire speed at the collecting roller.
Dependencies are inferred from the claim text.