Abstract: A wire electrode for wire electro-discharge machining comprises a core, and a coating layer formed on an outer periphery of the core at least a surface layer of which contains copper. The coating layer comprises an alloy of copper and at least one element selected from the group consisting of Zn, Cs, Se, Te and Mg, with the copper content being about 55.5 wt % to about 75 wt %. The coating layer does not have an oxide film thereon other than a natural oxide film.

Abstract: The present wire electrode for wire electro-discharge machining includes a core and a plurality of coating layers covering the outer peripheral surface of the core. The core and the plurality of coating layers are formed of different materials, and each of coating layers is made of a metal or a metal alloy including the metal selected from the group consisting of Cu, Sn, Ag, Al, Zn, Cs, Se, Te, Mg, Bi, Ti, P, In, Cr, and Fe.

Abstract: A discharge processing machine includes a base, a work platform, a machine head seat, a fixation seat, and a main shaft seat. The work platform is slidably mounted on the base. The machine head seat is mounted on one side of the base and is provided with a fixation arm, which is fastened at one end thereof with the fixation seat. The main shaft seat is slidably mounted on the fixation seat such that the main shaft seat slides along the direction of the normal line of the work platform. The fixation seat has a threaded hole, whereas the main shaft seat has a threaded rod which is driven by a servomotor to engage with various depths of the threaded hole of the fixation seat, so as to actuate the main shaft seat to displace along the direction of the normal line of the work platform.

Abstract: The shape of each electrical supply die for contact-supplying electricity to a wire electrode is changed to a cylindrical shape, and grooves are provided in its outer surface in parallel to the traveling direction of the wire, wherein upper electric supply is effected by contact-supplying of electricity at a projecting surface formed between adjacent ones of the grooves, while lower electric supply is effected by pressure contact-supplying of electricity by causing a concave surface to contact the groove.

Abstract: An electrode discharge machining (EDM) apparatus for machining slots in a jet pump diffuser in a nuclear reactor pressure vessel is described. The apparatus is configured to machine a plurality of slots in the diffuser at positions behind the diffuser sensing line within the plane formed by the center of the diffuser and the sensing line. The apparatus includes a housing, a plurality of clamp assemblies, a hook assembly configured to engage the sensing line standoff so that the apparatus is positioned at an angle from a plane formed by the center of the diffuser and the sensing line, and a plurality of electrode assemblies. The EDM apparatus can be configured to be installed clockwise or counter-clockwise around the sensing line depending on the spacing available around given diffusers. The EDM apparatus is capable of burning a plurality of slots at the same time, thereby saving time and money.

Abstract: An intermediate electrode guide is disposed between an electrode guide and an electrode holder. An intermediate electrode chuck of rubber elastic body is provided on the intermediate electrode guide. The intermediate electrode chuck has an insertion hole. The hole is enlarged when a fine hole machining electrode is inserted therein so as to facilitate such insertion. On the other hand, a diameter of the hole is lessened by driving a piston when feeding the electrode or machining the workpiece. Thus, the electrode is grasped by the intermediate chuck. The chuck and the electrode are rotated via bearings 13 and 19 so as to prevent shift of the electrode.