Electric heating – Metal heating – Cutting or disintegrating
Patent
1987-10-08
1989-02-14
LaRoche, Eugene R.
Electric heating
Metal heating
Cutting or disintegrating
219 69D, 219 69G, B23K 916
Patent
active
048048143
ABSTRACT:
An electron discharge machining (E.D.M.) tool combination is useful for removal of an installed nuclear steam generator tube plug of conductive material. A conductive wand shaft connected to an E.D.M. voltage source is movably mounted in a housing and insulated from the housing. An inlet adapter is mounted on the wand end and connected to a source of deionized and demineralized water to provide a dielectric fluid and removed material carrier. A hollow electrode is mounted on a hollow extension beyond the end of the wand and inlet adapter in fluid communication with the adapter for movement with the wand relative to the housing. A drive plate is moved by means of a ball nut along a roller ball shaft which is rotationally driven by a motor in the housing. The drive plate reciprocates the wand and electrode for E.D.M. operation. The wand position can be monitored remotely by a signal from a potentiometer with a tap movable with the wand.
REFERENCES:
patent: 3711676 (1973-01-01), Witzel
patent: 3758739 (1973-09-01), De Jongh et al.
patent: 3851135 (1974-11-01), Moracz et al.
patent: 4565914 (1986-01-01), Suzaki et al.
patent: 4628171 (1986-12-01), Colby et al.
patent: 4705932 (1987-11-01), Aso et al.
Brown Timothy L.
Hinds Eugene L.
Kiesche Eric A.
Southerland Tommy J.
Combustion Engineering Inc.
Ham Seung
LaRoche Eugene R.
Mulholland John H.
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