An electric discharge machining apparatus includes a tool electrode that performs electric discharge machining to a workpiece, a housing in which the tool electrode is inserted, a compressed gas supplying device for supplying compressed gas into a mist generating region which is provided between an inner wall of the housing and the tool electrode, a first flow path through which the compressed gas flows and connecting the compressed gas supplying device with the mist generating region, a pressurized working fluid supplying device for supplying pressurized working fluid into the mist generating region, and a second flow path through which the pressurized working fluid flows and connecting the pressurized working fluid supplying device with the mist generating region.

A grip unit including holding units in each of which an upper plate is placed on a lower plate to form a V-shaped groove, a grip unit control device that can change a distance between the holding unit in a range between a distance equal to or longer than a diameter of an electrode holder with an electrode feeding mechanism and a distance equal to a diameter of an electrode, a grip unit control device moving-shaft motor that can change a height of the grip unit in a range between a height at which the holding unit are placed lower than an electrode holder brim of an electrode holder having an electrode feeding mechanism attached to an electric holder gripping device and a height to which the holding units lift up the electrode holder brim of the electrode holder having an electrode feeding mechanism attached to the electric holder gripping device, and an electrode gripping device that can grip the electrode on a lower side of the grip unit are included. In one of the pair of holding units, a portion of the upper plate which forms the V-shaped groove is placed on a front side and a portion of the lower plate is placed on a rear side so as to overlap with each other. In the other one of the pair of holding unit, a portion of the lower plate which forms the V-shaped groove is placed on the front side and the upper plate is placed on the rear side so as to overlap with each other.

A grip unit including holding units in each of which an upper plate is placed on a lower plate to form a V-shaped groove, a grip unit control device that can change a distance between the holding unit in a range between a distance equal to or longer than a diameter of an electrode holder with an electrode feeding mechanism and a distance equal to a diameter of an electrode, a grip unit control device moving-shaft motor that can change a height of the grip unit in a range between a height at which the holding unit are placed lower than an electrode holder brim of an electrode holder having an electrode feeding mechanism attached to an electric holder gripping device and a height to which the holding units lift up the electrode holder brim of the electrode holder having an electrode feeding mechanism attached to the electric holder gripping device, and an electrode gripping device that can grip the electrode on a lower side of the grip unit are included. In one of the pair of holding units, a portion of the upper plate which forms the V-shaped groove is placed on a front side and a portion of the lower plate is placed on a rear side so as to overlap with each other. In the other one of the pair of holding unit, a portion of the lower plate which forms the V-shaped groove is placed on the front side and the upper plate is placed on the rear side so as to overlap with each other.

It is provided an electrolysis and grinding combined machining device and method. The device includes a machine tool bed, a vertical moving mechanism and a horizontal moving mechanism which are provided on the machine tool bed. An electrode clamping device is provided on the vertical moving mechanism, and the electrode clamping device is configured to fix a tool electrode. An electrolysis tank is provided on the horizontal moving mechanism. A workpiece to be machined is placed in the electrolysis tank. The tool electrode includes a metal wire and abrasive materials distributed on a surface of the metal wire. The tool electrode and the workpiece to be machined are electrically connected with a pulse power source. A current sensor is arranged between the workpiece and the pulse power source. A data acquisition card is connected to the current sensor; the data acquisition card is electrically connected with an industrial personal computer.

It is provided an electrolysis and grinding combined machining device and method. The device includes a machine tool bed, a vertical moving mechanism and a horizontal moving mechanism which are provided on the machine tool bed. An electrode clamping device is provided on the vertical moving mechanism, and the electrode clamping device is configured to fix a tool electrode. An electrolysis tank is provided on the horizontal moving mechanism. A workpiece to be machined is placed in the electrolysis tank. The tool electrode includes a metal wire and abrasive materials distributed on a surface of the metal wire. The tool electrode and the workpiece to be machined are electrically connected with a pulse power source. A current sensor is arranged between the workpiece and the pulse power source. A data acquisition card is connected to the current sensor; the data acquisition card is electrically connected with an industrial personal computer.

An electrical discharge machining (EDM) assembly includes a mounting device that is configured to support an EDM electrode relative to a work piece. The electrode includes an axial opening that extends between opposed ends of the electrode, a first portion that includes one end and a second portion that includes the opposed end. The flexibility of the first portion is greater than that of the second portion. For example, the first portion may be a helical spring and the second portion may be a rigid tube. The mounting device includes a back plate, an upright portion that protrudes from the back plate and a curved sleeve disposed in a through hole that extends through the back plate and the upright portion. The electrode is movably disposed in the sleeve.

An electrical discharge machining (EDM) assembly includes a mounting device that is configured to support an EDM electrode relative to a work piece. The electrode includes an axial opening that extends between opposed ends of the electrode, a first portion that includes one end and a second portion that includes the opposed end. The flexibility of the first portion is greater than that of the second portion. For example, the first portion may be a helical spring and the second portion may be a rigid tube. The mounting device includes a back plate, an upright portion that protrudes from the back plate and a curved sleeve disposed in a through hole that extends through the back plate and the upright portion. The electrode is movably disposed in the sleeve.

EDM assemblies mount on a machining surface and discharge rotating sub-electrodes against the surface. The sub-electrodes can also revolve about another shared axis while discharging. Rotation and revolution may be achieved with planetary gears fixed with the sub-electrodes and meshing with a stationary sun gear. Several sub-electrodes can be used in a single assembly. Downward movement of the sub-electrodes from a central shaft on the mount allows several inches of the surface to be machined. Assemblies are usable in a nuclear reactor during a maintenance period to machine a hole for a replacement manway cover underwater in the flooded reactor. The differing rotational movements and vertical movement can be independently controlled with separate motors in the assembly. Power and controls may be provided remotely through an underwater connection.

The present disclosure relates to an electrical discharge machining (EDM) device, and a method for machining a workpiece by the EDM device. The EDM device includes a spindle, a guide structure including a plurality of guideways, and a plurality of electrodes, the electrode coupled to the spindle via a flexible link, and slidably engaged with a respective one of the plurality of guideways.

The present disclosure relates to an electrical discharge machining (EDM) device, and a method for machining a workpiece by the EDM device. The EDM device includes a spindle, a guide structure including a plurality of guideways, and a plurality of electrodes, the electrode coupled to the spindle via a flexible link, and slidably engaged with a respective one of the plurality of guideways.