Electron discharge machining tool

Electric heating – Metal heating – Cutting or disintegrating

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219 692, B23K 900, B23H 100, B23H 1100

Patent

active

052256456

ABSTRACT:
An electron discharge machining tool (10) for removal of conductive material from a workpiece such as a plug (28) in a nuclear steam generator tube (26) is an end effector connected to a remotely operated manipulator arm by a mount (56). A piston (47) drives a hollow conductive rod (44) with a graphite electrode cutter (30) in reciprocating motion through receptacle (14) having a restrictive drain (37) and containing deionized water. The reciprocation of rod (44) is controlled by power supply (50) sensing the electrical potential and signalling valve (48) which controls hydraulic flow in conduits (54a, 54b) communicated to opposite sides of the piston (47). A TV camera (32) and a light (34) mounted behind a lens (36) are used to monitor the machining.

REFERENCES:
patent: 2996638 (1961-08-01), Webb
patent: 4467167 (1984-08-01), Oizumi et al.
patent: 4584452 (1986-04-01), Zafred
patent: 4672162 (1987-06-01), Burns et al.
patent: 4720898 (1988-01-01), Calfo et al.
patent: 4804814 (1989-02-01), Southerland et al.
patent: 4916282 (1990-04-01), Chamming s et al.
patent: 4937675 (1990-06-01), Starceski et al.
patent: 5086201 (1992-02-01), Grypezynski et al.
Patent Abstracts of Japan, vol. 10, No. 388, Dec. 1986 of Japan Patent document 61-178,122.

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