A wire electrical discharge machine machines a workpiece so as to have different machined shapes on a top surface and a bottom surface of the workpiece. The wire electrical discharge machine includes: a distance measuring sensor for moving within a machining area of the wire electrical discharge machine and measuring a distance between the distance measuring sensor and an object to be measured; and a vertical position calculating unit for calculating a distance between a reference surface and the top surface and a distance between the reference surface and the bottom surface, from a distance between the reference surface and the distance measuring sensor, a distance between the top surface and the distance measuring sensor, and a distance between the bottom surface and the distance measuring sensor, measured by the distance measuring sensor.

A vibration assisted wire machining device is provided, the vibration assisted wire machining device allows a metal wire to be driven by a bi-axial sinusoidal vibration source during a wire machining process, wherein the bi-axial sinusoidal waveforms have the same amplitude, and preferably, the bi-axial sinusoidal waveforms are synchronous and always have a vibration phase difference of 90 degrees. Therefore, the present invention can reduce wire breakage risks and improve wire-cutting efficiency, and raise machining stability and material removal rate of a wire-electrical discharge machining (Wire-EDM) process performed on a workpiece, as well as achieve desirable precision of a geometric shape. It also relates to a vibration assisted wire machining device that enables metal wires associated with the abrasive slurry formed of hard abrasive grains, for performing bi-axial vibration assisted abrasive cutting or abrasive grinding on the workpiece.

A vibration assisted wire machining device is provided, the vibration assisted wire machining device allows a metal wire to be driven by a bi-axial sinusoidal vibration source during a wire machining process, wherein the bi-axial sinusoidal waveforms have the same amplitude, and preferably, the bi-axial sinusoidal waveforms are synchronous and always have a vibration phase difference of 90 degrees. Therefore, the present invention can reduce wire breakage risks and improve wire-cutting efficiency, and raise machining stability and material removal rate of a wire-electrical discharge machining (Wire-EDM) process performed on a workpiece, as well as achieve desirable precision of a geometric shape. It also relates to a vibration assisted wire machining device that enables metal wires associated with the abrasive slurry formed of hard abrasive grains, for performing bi-axial vibration assisted abrasive cutting or abrasive grinding on the workpiece.

A conductive electrode wire for use in an electric discharge machine (EDM) is provided, comprising a core wire comprised of one single metal or an alloy of multiple metals with a coating deposited by the electro-plasma process, wherein such coatings are alloys of zinc and nickel. A process for treating a surface of an electrically conductive workpiece, such as a core wire, is also provided.

A conductive electrode wire for use in an electric discharge machine (EDM) is provided, comprising a core wire comprised of one single metal or an alloy of multiple metals with a coating deposited by the electro-plasma process, wherein such coatings are alloys of zinc and nickel. A process for treating a surface of an electrically conductive workpiece, such as a core wire, is also provided.

A method and device for removing an electromagnetic core, the method including: using an electromagnet to magnetize or demagnetize a metallic upper nozzle when a magneto-conductive workpiece is cut off in a WEDM manner; attracting a core capable of being completely cut off and separated in the workpiece; utilizing the metallic upper nozzle to detect whether attracted; if the core is attracted, moving the core to a target area; demagnetizing and dropping the core in a trash area. The device is applied to a WEDM machine; after the metallic magneto-conductive upper nozzle is magnetized by the electromagnet, the upper nozzle is used to attract the magneto-conductive core; a metallic water spray cover is utilized to detect whether the core is attracted; the core is moved to the target area by a motion system of the WEDM machine, and dropped in a trash device after the upper nozzle is demagnetized.

A method and device for removing an electromagnetic core, the method including: using an electromagnet to magnetize or demagnetize a metallic upper nozzle when a magneto-conductive workpiece is cut off in a WEDM manner; attracting a core capable of being completely cut off and separated in the workpiece; utilizing the metallic upper nozzle to detect whether attracted; if the core is attracted, moving the core to a target area; demagnetizing and dropping the core in a trash area. The device is applied to a WEDM machine; after the metallic magneto-conductive upper nozzle is magnetized by the electromagnet, the upper nozzle is used to attract the magneto-conductive core; a metallic water spray cover is utilized to detect whether the core is attracted; the core is moved to the target area by a motion system of the WEDM machine, and dropped in a trash device after the upper nozzle is demagnetized.

A wire electric discharge machine for machining a workpiece by causing a discharge between a wire electrode delivered from a wire bobbin and the workpiece. The wire electric discharge machine includes: a remaining length calculation unit that calculates a remaining length of the wire electrode based on electrode winding coefficients, bobbin draw-out radius correlation information, and a spool diameter of the wire bobbin. The electrode winding coefficients depend on a winding density of the wire electrode, an inner width of the wire bobbin, a wire diameter of the electrode wire, and a winding tension of the wire electrode. The bobbin draw-out radius correlation information is correlated with a bobbin draw-out radius that is a distance between a position at which the wire electrode wound around the wire bobbin is separated from the wire bobbin and a central axis of rotation of the wire bobbin.

A wire electric discharge machine for machining a workpiece by causing a discharge between a wire electrode delivered from a wire bobbin and the workpiece. The wire electric discharge machine includes: a remaining length calculation unit that calculates a remaining length of the wire electrode based on electrode winding coefficients, bobbin draw-out radius correlation information, and a spool diameter of the wire bobbin. The electrode winding coefficients depend on a winding density of the wire electrode, an inner width of the wire bobbin, a wire diameter of the electrode wire, and a winding tension of the wire electrode. The bobbin draw-out radius correlation information is correlated with a bobbin draw-out radius that is a distance between a position at which the wire electrode wound around the wire bobbin is separated from the wire bobbin and a central axis of rotation of the wire bobbin.

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.