A wire electrical discharge machine includes: a drive control unit for moving a wire electrode relative to a workpiece along a machining path; a path determination unit for determining whether or not the machining path includes a linear path section that crosses a boundary line between a thick portion and a thin portion of the workpiece; and a path compensator for compensating the machining path so as to form, in the thin portion, a protrusion projecting outward from the boundary line when the path determination unit determines that the linear path section is included.

A wire electrical discharge machine includes: a gap voltage detector for detecting a voltage across an electrode gap; a first voltage control unit for applying a first voltage to the electrode gap; a discharge determiner for determining whether or not the electrode gap is in a discharging state during application of the first voltage; and a second voltage control unit for supplying a machining current through the electrode gap when the electrode gap is in a discharging state. After a supply of the machining current to the electrode gap, even when a discharge is induced by the next application of the first voltage to the electrode gap, the second voltage control unit prohibits application of a second voltage to the electrode gap.

A machining program editor that edits a machining program in which a machining path for a wire electrode of a wire electrical discharge machine is set, the machining program editor including: a path determination unit configured to determine whether or not the machining path includes a linear path section that crosses a boundary line between a thick portion of a workpiece and a thin portion of the workpiece, a thickness of the thin portion being smaller than a thickness of the thick portion in an extending direction of the wire electrode; and a path compensator configured to compensate the machining path so as to form, in the thin portion over a predetermined distance, a protrusion projecting outward from the boundary line when the path determination unit determines that the linear path section is included.

The disclosure provides a wire electric discharge machine and a wire electric discharge machining method capable of detecting concentrated electric discharge in real time by a discharge position obtained from a preliminary discharge current, and calculating an accurate discharge position for use in measuring a plate thickness or the like. The wire electric discharge machine according to the disclosure includes a discharge position calculation circuit calculating a discharge position from the preliminary discharge current respectively detected through a current detector during a first period from a time when a waveform of the preliminary discharge current supplied to a machining gap, formed by a wire electrode and a workpiece, rises to a time when the preliminary discharge current reaches a constant current value, and a second period after the time when the preliminary discharge current reaches the constant current value to a time when a main discharge current is supplied.

The invention relates to a method for electrical discharge machining of workpieces by electrical discharge pulses generated by a power module of an electrical discharge machine. The invention is characterized in that firstly the discharge voltage of a number N1 of electrical discharge pulses is acquired and stored, secondly a front discharge voltage (63) is determined out of this amount of N1 acquired discharge voltages and thirdly, the voltage Uhps (64) of the electrical discharge pulses produced by the power module for machining the workpiece (17) is adjusted in function of the determined front discharge voltage (63).

Provided is an electric discharge machining apparatus including: a wire guide, positioning and guiding a wire electrode stretched perpendicularly to a horizontal line; a power conductor, energizing the wire electrode; a guide assembly, accommodating the wire guide and the power conductor; an extrusion member, provided in the guide assembly and pushing out the power conductor in a direction of the wire electrode; a drive device, reciprocating the extrusion member in a horizontal uniaxial direction; a fixing device, fixing the power conductor in a predetermined position within the guide assembly by the extrusion member; and an elastic member, provided coaxially with the extrusion member of the fixing device and constantly pushing out the power conductor in the direction of the wire electrode in a state in which the power conductor is attachable to and detachable from the guide assembly.

A wire electrical discharge machine includes: a voltage application unit for repeatedly applying a voltage to an electrode gap between the workpiece and the wire electrode at a predetermined cycle; a switching element connected in parallel with the electrode gap and configured to short-circuit the electrode gap; and a control section for controlling the switching element so as to short-circuit the electrode gap in a pause period during which the voltage is not applied. The control section adjusts a short-circuiting period in which the electrode gap is short-circuited according to the machining shape specified by a machining program.

Whether or not an inter-electrode voltage exceeds a voltage threshold is determined after a predetermined inter-electrode state determination period has passed since application of an induction voltage (inter-electrode voltage) to an inter-electrode gap. Thus, an inter-electrode gap amount between a wire electrode and a work is estimated. A pause time during which electrical discharge is not performed is changed according to an estimation result of the inter-electrode gap amount.

An electric discharge machining system is provided which distinguishes an abnormal discharge caused by an immediate discharge and an abnormal discharge caused not by the immediate discharge to suitably control in each case. The electric discharge machining system according to the present invention that machines a workpiece by producing a discharge between an electrode and the workpiece, includes: a no-load-time detection means that detects no-load time of inter-electrode voltage between the electrode and the workpiece; an immediate-discharge determination means that compares the no-load time detected by the no-load-time detection means with predetermined time to determine whether or not the discharge is an immediate discharge; a voltage detection means that detects the inter-electrode voltage; an abnormal-discharge determination means that compares the voltage detected by the voltage detection means with a predetermined value to determine whether or not the discharge is a normal discharge; a discharge state assessment means that assesses a state of the discharge on the basis of the determination result of the immediate-discharge determination means and the determination result of the abnormal-discharge determination means; and a machining condition control means that controls a machining condition on the basis of the discharge state assessed by the discharge state assessment means.

A device for machining a part by electrical discharge machining using an electrode wire. The device includes equipment for holding the electrode wire taut and driving the wire to translate longitudinally, in proximity to the part to be machined, in a sparking zone. The device further includes equipment for making a stream of dielectric liquid flow through the sparking zone between the electrode wire and the part to be machined. An electrical power source generates electrical pulses that cause sparks in the sparking zone between the electrode wire and the part to be machined. The quantity of gas bubbles present in the sparking zone is measured, and a signal is produced, representative of the quantity of bubbles, the signal being delivered to a controller. The controller modifies machining parameters so as to maintain the value of the signal within a suitable range.