A multi-wire electric discharge machine includes: a plurality of cutting wire sections arranged in parallel in such a way as to face a workpiece, a wire electrode being wound around guide rollers to form the cutting wire sections; a drive unit that adjusts relative distances between the workpiece and the cutting wire sections; a machining power supply that applies pulse voltages between the workpiece and the cutting wire sections; a machining-state detection device that detects machining states in the cutting wire sections; and a machining control device that controls the drive unit and the machining power supply, in which when values indicating the machining states exceed a threshold value, the machining control device outputs, to the machining power supply, commands to apply the pulse voltages according to a machining condition for avoiding breakage of the wire electrode.

A wire electrical discharge machine includes an upper wire guide and a lower wire guide supporting a wire electrode, a probe provided on an upper guide block having the upper wire guide, an offset storage unit for storing an offset amount from the upper wire guide to the probe, a position shift drive unit for changing the relative position between the table, and the upper and lower wire guides, a drive controller for controlling the position shift drive unit, a contact position calculator for calculating a contact position that is a position of the probe when it comes in contact, and a machining start position calculator for calculating a machining start position of the wire electrode, based on at least two contact positions and the offset amount. The drive controller controls the position shift drive unit so that the position of the wire electrode becomes the machining start position.

A wire electrical discharge machine determines the position of an endface of a workpiece by relatively moving a wire electrode toward the workpiece. The wire electrical discharge machine includes: a voltage application control unit configured to continuously apply voltage pulses between the wire electrode and the workpiece; a voltage detection unit configured to detect a voltage between the wire electrode and the workpiece; a pulse occurrence ratio calculation unit configured to calculate a pulse occurrence ratio that is a ratio of the number of the voltage pulses detected by the voltage detection unit to the number of the voltage pulses applied per a predetermined time by the voltage application control unit; and an endface position determination unit configured to determine the position of the endface of the workpiece based on the pulse occurrence ratio.

A wire electrical discharge machine for machining a workpiece by generating electric discharge at a discharge gap between the workpiece and a wire electrode includes: a machining current setting unit for setting the magnitude of a normal machining current depending on the discharge gap state at application of a discharge induction voltage at the previous time or previous times; and a machining current control unit configured to control a main discharge circuit so as to supply the normal machining current to the discharge gap when the present discharge gap state is the normal state, control the main discharge circuit so as to supply a short-circuit machining current smaller than a predetermined current to the gap when the discharge gap state is the short-circuited state, and control the main discharge circuit so as not to supply any machining current to the gap when the discharge gap state is the open state.

The invention relates to a method for making nanopores in thin layers or monolayers of transition metal dichalcogenides that enables accurate and controllable formation of pore within those thin layer(s) with sub-nanometer precision.

The invention relates to a method for making nanopores in thin layers or monolayers of transition metal dichalcogenides that enables accurate and controllable formation of pore within those thin layer(s) with sub-nanometer precision.

The disclosure provides an electric discharge machining apparatus. The apparatus includes: temperature sensors respectively attached to an upper portion, a middle portion, and a lower portion of the electric discharge machining apparatus and measuring temperatures of the electric discharge machining apparatus at predetermined time intervals; a control device calculating values of temperature environment diagnostic indexes, which are indexes for determining machining accuracy of the workpiece obtained when electric discharge machining is performed in a current temperature environment, from measurement results of the temperature sensors, comparing the values of the temperature environment diagnostic indexes with reference values of the temperature environment diagnostic indexes recommended for achieving desired machining accuracy, and outputting determination results indicating a degree of whether the current temperature environment around the electric discharge machining apparatus is appropriate for achieving the desired machining accuracy according to differences; and a storage part storing the reference values and the determination results.

A control device for a wire electric discharge machine includes: a shape analysis portion which looks ahead a machining program, and analyzes a machined shape of a workpiece; a machining path creation portion which creates machining paths of identical circular arc shape offsetting from a machined shape analyzed, wherein the offset value differs for the machining paths, and shape of a corner part are identical circular arc shape; a machining path creation portion which creates machining paths of concentric circle shape offsetting from a machined shape analyzed, wherein the offset value differs for the machining paths, and shape of a corner part are concentric circle shape; and a machining path selection portion which selects either of the machining paths of identical circular arc shape and concentric circle shape, based on at least one among the machining program, machined shape analyzed, and the machining paths of identical circular arc shape and concentric circle shape.

A control device for a wire electric discharge machine includes: a shape analysis portion which looks ahead a machining program, and analyzes a machined shape of a workpiece; a machining path creation portion which creates machining paths of identical circular arc shape offsetting from a machined shape analyzed, wherein the offset value differs for the machining paths, and shape of a corner part are identical circular arc shape; a machining path creation portion which creates machining paths of concentric circle shape offsetting from a machined shape analyzed, wherein the offset value differs for the machining paths, and shape of a corner part are concentric circle shape; and a machining path selection portion which selects either of the machining paths of identical circular arc shape and concentric circle shape, based on at least one among the machining program, machined shape analyzed, and the machining paths of identical circular arc shape and concentric circle shape.

An electrical discharge machining apparatus and an electrical discharge machining method with adjustable machining parameters comprise a carrier and an electrical discharge machining (EDM) unit. The carrier is used for placing a to-be-machined object defined with a machining target area. A discharge electrode of the electrical discharge machining (EDM) unit is used to cut the machining target area of the to-be-machined object along a first cutting direction with at least one machining parameter, the machining parameter is correspondingly adjusted when a specified parameter of the to-be-machined object changes to a first numerical value, thereby using the adjusted machining parameter to perform a second cutting step on the machining target area of the to-be-machined object. A segmented cutting technology for solving a problem that a cutting speed (mm.sup.2/min) is slowed down and a total cutting time is prolonged due to changes of the specified parameter of electrical discharge machining cutting.