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.

The invention relates to a wire electrode for spark-erosion cutting, comprising a core (2), which has a metal or a metal alloy, and a sheath (3, 4, 6), which surrounds the core (2) and comprises one or more sheath layers (3, 4, 6), one of which comprises regions (3) having a morphology corresponding to block-like particles, which are spatially separated, at least over part of their periphery, from one another, from the material of the layer comprising said regions, from the material of one or more other layers and/or from the core material by cracks, characterized in that, in a wire cross-section, viewed perpendicularly or parallel to the wire longitudinal axis, more than 50% of the surface area of a region having the morphology of a block-like particle has a copper-zinc alloy with a zinc concentration of 38 to 49 wt. %. There is optionally a thin cover layer on the block-like particles, which cover layer consists of more than 50 wt. % zinc oxide with a thickness of 0.05 to 2 μm. Said cover layer has regions in which the copper-zinc alloys that the block-like particles have emerge at the surface. The invention also relates to a method for producing said wire electrode.

The invention relates to a wire electrode for spark-erosion cutting, comprising a core (2), which has a metal or a metal alloy, and a sheath (3, 4, 6), which surrounds the core (2) and comprises one or more sheath layers (3, 4, 6), one of which comprises regions (3) having a morphology corresponding to block-like particles, which are spatially separated, at least over part of their periphery, from one another, from the material of the layer comprising said regions, from the material of one or more other layers and/or from the core material by cracks, characterized in that, in a wire cross-section, viewed perpendicularly or parallel to the wire longitudinal axis, more than 50% of the surface area of a region having the morphology of a block-like particle has a copper-zinc alloy with a zinc concentration of 38 to 49 wt. %. There is optionally a thin cover layer on the block-like particles, which cover layer consists of more than 50 wt. % zinc oxide with a thickness of 0.05 to 2 μm. Said cover layer has regions in which the copper-zinc alloys that the block-like particles have emerge at the surface. The invention also relates to a method for producing said wire electrode.

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.

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 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 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.