| 摘要 |
PCT No. PCT/SU88/00024 Sec. 371 Date Sep. 26, 1989 Sec. 102(e) Date Sep. 26, 1989 PCT Filed Jan. 27, 1988 PCT Pub. No. WO89/07028 PCT Pub. Date Aug. 10, 1989.An apparatus for electroerosive piercing of holes in workpieces having an electrode tool in the form of a rod placed with a clearance in a shell and projecting therefrom, a device for feeding and rotating the rod mechanically connected to a device for reciprocating the shell relative to the rod. The device for reciprocating the shell relative to the rod is fashioned as a hydraulic cylinder, a piston of which has the shell rigidly secured thereto at the side of the workpiece, and at least one cavity of the hydrauylic cylinder is connected to a system for feeding and discharging a working fluid, the piston having at least one passage communicable with the interior of the shell of the electrode tool and wherethrough the rod of the electrode tool extends with a clearance.
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