In a wire electric discharge machine, time from application of a voltage to a machining gap between a workpiece and a wire electrode until occurrence of electric discharge is measured as a discharge delay time, and the measured discharge delay time is integrated over a predetermined measurement period to calculate a discharge delay integrated time. Further, the number of times of the voltage application in the measurement period is counted. An average discharge delay time per voltage application in the measurement period is calculated from the discharge delay integrated time and the number of times of voltage application. The movement of the wire electrode with respect to the workpiece is controlled on the basis of the average discharge delay time.

In a wire electric discharge machine, time from application of a voltage to a machining gap between a workpiece and a wire electrode until occurrence of electric discharge is measured as a discharge delay time, and the measured discharge delay time is integrated over a predetermined measurement period to calculate a discharge delay integrated time. Further, the number of times of the voltage application in the measurement period is counted. An average discharge delay time per voltage application in the measurement period is calculated from the discharge delay integrated time and the number of times of voltage application. The movement of the wire electrode with respect to the workpiece is controlled on the basis of the average discharge delay time.

In a wire electric discharge machine, time from application of a voltage to a machining gap between a workpiece and a wire electrode until occurrence of electric discharge is measured as a discharge delay time, and the measured discharge delay time is integrated over a predetermined measurement period to calculate a discharge delay integrated time. Further, the number of times of the voltage application in the measurement period is counted. An average discharge delay time per voltage application in the measurement period is calculated from the discharge delay integrated time and the number of times of voltage application. The movement of the wire electrode with respect to the workpiece is controlled on the basis of the average discharge delay time.

In a wire electric discharge machine, time from application of a voltage to a machining gap between a workpiece and a wire electrode until occurrence of electric discharge is measured as a discharge delay time, and the measured discharge delay time is integrated over a predetermined measurement period to calculate a discharge delay integrated time. Further, the number of times of the voltage application in the measurement period is counted. An average discharge delay time per voltage application in the measurement period is calculated from the discharge delay integrated time and the number of times of voltage application. The movement of the wire electrode with respect to the workpiece is controlled on the basis of the average discharge delay time.

A wire electrical discharge machine includes: a mounting table having a placement plane on which a workpiece can be placed; a first guide portion and a second guide portion for stretching a wire electrode therebetween. The first guide portion is integrally equipped with a probe. The relative position in the placement plane between the probe detecting its abutment with the workpiece and the first guide portion before moving the relative position between the first guide portion and the second guide portion is stored as an offset. This offset is corrected based on the tilt information indicating the tilt state of the workpiece relative to the placement plane. Thus, it is possible to obtain the corrected offset in accordance with the tilt state of the workpiece after changing the relative position between the first guide portion and the second guide portion.

A wire electrical discharge machine includes: a mounting table having a placement plane on which a workpiece can be placed; a first guide portion and a second guide portion for stretching a wire electrode therebetween. The first guide portion is integrally equipped with a probe. The relative position in the placement plane between the probe detecting its abutment with the workpiece and the first guide portion before moving the relative position between the first guide portion and the second guide portion is stored as an offset. This offset is corrected based on the tilt information indicating the tilt state of the workpiece relative to the placement plane. Thus, it is possible to obtain the corrected offset in accordance with the tilt state of the workpiece after changing the relative position between the first guide portion and the second guide portion.

A control device includes an interpolar average machining voltage detection unit that detects an interpolar average machining voltage between an electrode and a workpiece, an interpolar average machining voltage correction unit that corrects the detected interpolar average machining voltage, a machining speed control unit that calculates a machining speed of the electrode based on the difference between the set voltage, which is set in advance as a target value of the interpolar average machining voltage, and the corrected interpolar average machining voltage, and a drive control device that controls a machining speed of the electrode based on the calculated machining speed. The interpolar average machining voltage correction unit corrects the detected interpolar average machining voltage based on a difference between the calculated machining speed and the set speed, which is set in advance as a target value of the machining speed.

A control device includes an interpolar average machining voltage detection unit that detects an interpolar average machining voltage between an electrode and a workpiece, an interpolar average machining voltage correction unit that corrects the detected interpolar average machining voltage, a machining speed control unit that calculates a machining speed of the electrode based on the difference between the set voltage, which is set in advance as a target value of the interpolar average machining voltage, and the corrected interpolar average machining voltage, and a drive control device that controls a machining speed of the electrode based on the calculated machining speed. The interpolar average machining voltage correction unit corrects the detected interpolar average machining voltage based on a difference between the calculated machining speed and the set speed, which is set in advance as a target value of the machining speed.

A relationship between a weight of a reel supported by a column of a wire electric discharge machine when a wire electrode is wound around the reel, and an amount of slanting of the wire electrode when the wire electrode extended between an upper wire guide and a lower wire guide becomes slanted as a result of the column being deformed by the weight of the reel is stored. The weight of the reel is determined during electric discharge machining, and the amount of slanting of the extended wire electrode is determined from the weight of the reel. A compensation amount for the slanting of the wire electrode is determined from the amount of slanting, and the slanting of the wire electrode is compensated by the compensation amount.

A relationship between a weight of a reel supported by a column of a wire electric discharge machine when a wire electrode is wound around the reel, and an amount of slanting of the wire electrode when the wire electrode extended between an upper wire guide and a lower wire guide becomes slanted as a result of the column being deformed by the weight of the reel is stored. The weight of the reel is determined during electric discharge machining, and the amount of slanting of the extended wire electrode is determined from the weight of the reel. A compensation amount for the slanting of the wire electrode is determined from the amount of slanting, and the slanting of the wire electrode is compensated by the compensation amount.