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US 4,661,674 AGranted
Minimum-impedance conductor assembly for EDM
AssigneeInoue-Japax Research Incorporated
InventorKiyoshi Inoue
Life of this patent
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AssigneeInoue-Japax Research Incorporated
InventorKiyoshi Inoue
Estimating the term…
An EDM circuit arrangement incorporating a minimum-impedance electrical conductor assembly in a tubular form between an EDM pulse generator and a machining gap, the assembly having a first group of conductors connected between one terminal of the pulse generator and a tool electrode to conduct the machining pulses in one direction and a second group of conductors connected between the other terminal of the pulse generator to conduct the machining pulses in the opposite direction. An electrically nonconductive member contouring the tubular form and having these conductors mounted therein in mutually insulating and generally parallel and equally spaced relationship in an endless row, framing the tubular form, between its outer and surfaces and generally concentric therewith is provided. The conductors are arranged in such a manner that each of the conductors in the first group is axially aligned proximate with a conductor of the other group in the endless row.
An EDM circuit arrangement, comprising:
In an EDM circuit arrangement wherein an EDM pulse generator having a pair of terminals for providing a succession of EDM current pulses is electrically connected across a machining gap between a tool electrode and an electrically conductive workpiece, the improvement comprising a low impedance electrical conductor including a plurality of electrical conductors each being separately insulated by a generally cylindrical sleeve of insulation, said conductors being disposed in parallel relation and tangentially joined together in a hollow cylindrical assembly defining outer and inner generally concentric surfaces wherein, except for the tangential junctions with adjacent insulated conductors, the surface of the insulation sleeve of each said conductor is exposed for contact with cooling fluid, said conductors being equally divided between a first group electrically connecting one of said pair of terminals with said tool electrode to conduct current pulses in one direction and a second group electrically connecting the other of said pair of terminals and said workpiece to conduct current pulses in the other direction, each conductor in said first group being annularly adjacent one conductor in said second group.
Dependencies are inferred from the claim text.