Abstract: 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.

Abstract: An object of the present invention is to accurately position a wire electrode and a work. A control device included in a wire electric discharge machine of the present invention causes, in a state in which movement of the wire electrode in a longitudinal direction is stopped, a capacitance measuring section to measure capacitance while causing a driving section to relatively move a wire electrode and a work, thereafter causes, in a state in which the control device causes a wire moving section to move the wire electrode in the longitudinal direction, the capacitance measuring section to measure the capacitance, and causes the driving section to adjust relative positions of the wire electrode and the work.

Abstract: A control device for a wire discharge machine including an interpolar average machining voltage detection unit 5 that detects an interpolar average machining voltage between an electrode 3 and a workpiece 4 to be machined, an interpolar average machining voltage correction unit 12 that corrects the interpolar average machining voltage detected by the interpolar average machining voltage detection unit, a set voltage storage unit 6 that stores, in advance, a set voltage serving as a target value of the interpolar average machining voltage, a voltage calculation unit 7 that calculates a difference between the set voltage and an output of the interpolar average machining voltage correction unit 12, a machining speed control unit 8 that calculates a machining speed of the electrode based on the difference calculated by the voltage calculation unit 7, a drive control device 9 that controls a machining speed of the electrode in accordance with the calculated machining speed, a set speed storage unit 10 that sets, i