Wire electrode annealing processing method and wire electric discharge machining device
AssigneeMitsubishi Electric Corporation
InventorsRintaro Nagaoka, Zhengyong Liu
Life of this patent
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Abstract
Values of a current and a voltage from a heating power supply device that supplies a current to a wire electrode and that heats the wire electrode are measured, a load resistance value is calculated by dividing the voltage value by the current value, a resistance increment of the wire electrode is calculated from an increased amount in the load resistance value with reference to the load resistance value and an estimated resistance value, a temperature rise value of the wire electrode is estimated based on a specific resistance of the wire electrode and a temperature coefficient of the specific resistance, and a state of carrying a current to the wire electrode is controlled based on the temperature rise value.
Claims9
A wire electrode annealing processing method for a wire electric discharge machining device configured to generate a discharge phenomenon between a workpiece and a wire electrode to perform machining on the workpiece, to arrange each annealing electrode of a pair of annealing electrodes at predetermined two points on the wire electrode, respectively, to carry a current to the wire electrode via the annealing electrodes with a tension applied to the wire electrode, to heat the wire electrode, and to correct a bending tendency of the wire electrode between the two points, the method comprising:
- measuring values of a current and a voltage from a heating power supply device heating the wire electrode by carrying the current to the wire electrode;
- calculating a load resistance value during the heating by dividing the voltage value by the measured current value;
- calculating a resistance increment of the wire electrode from an increased amount in the calculated load resistance value relative to another load resistance value right after starting the heating of the wire electrode, and from a resistance value of the wire electrode at room temperature;
- estimating a temperature rise value of the wire electrode based on the calculated resistance increment, a preset specific resistance of the wire electrode, and a temperature coefficient of the specific resistance;
- and
- controlling a state of carrying the current to the wire electrode based on the estimated temperature rise value.
A wire electric discharge machining device configured to generate a discharge phenomenon between a workpiece and a wire electrode to perform machining on the workpiece, to arrange each annealing electrode of a pair of annealing electrodes at predetermined two points on the wire electrode, respectively, to carry a current to the wire electrode via the annealing electrodes with a tension applied to the wire electrode, to heat the wire electrode, and to correct a bending tendency of the wire electrode between the two points, the device comprising:
- a heating power supply device that heats the wire electrode by supplying electric power to the wire electrode;
- a current and voltage measurement unit that measures values of a current and a voltage from the heating power supply device that carries the current to the wire electrode;
- an estimation unit that calculates a load resistance value during the heating by dividing the voltage value by the measured current value, calculates a resistance increment of the wire electrode from an increased amount in the calculated load resistance value relative to another load resistance value right after starting the heating of the wire electrode, and from a resistance value of the wire electrode at room temperature, and estimates a temperature rise value of the wire electrode based on the calculated resistance increment, a preset specific resistance of the wire electrode, and a temperature coefficient of the specific resistance;
- and
- a control unit that controls a state of carrying the current to the wire electrode based on the estimated temperature rise value.
Dependencies are inferred from the claim text.