Process for electrochemical machining

Details Process for electrochemical machining Process for electrochemical machining

1994-07-07

1996-05-14

Valentine, Donald R.

Electrolysis: processes, compositions used therein, and methods

Electrolytic erosion of a workpiece for shape or surface...

Gap maintenance or defined tool-workpiece gap

205671, 205685, B23H 308, B23H 310, B23H 900

Patent

active

055164013

ABSTRACT:
An electrolyte is circulated between the surface to be machined, raised to an anode potential, and a tool electrode (9') raised to a cathode potential. The electrolyte contains lithium nitrate as a unique active product with a concentration of between 20 g/l and 2350 g/l and preferably between 50 g/l and 250 g/l. The process can be applied to the machining of the surface of any metallic component and in particular to the machining of the internal surface of tubular components (5) such as penetrations in the vessel bottom or closure head of a nuclear reactor; in this case the electrochemical machining cell consists of a cylindrical tool electrode (9') placed inside the component to be machined.

REFERENCES:
patent: 4369101 (1983-01-01), Wolff et al.
patent: 4826582 (1989-05-01), Lavalerie et al.
patent: 4849084 (1989-07-01), Vouzelland
Search Report FR 93 08433 Mar. 1994.
Derwent Publications Ltd. AN 91-345095 no date.
Derwent Publications Ltd. AN 87-21166 no date.
Derwent Publications Ltd. AN 87-038273 no date.

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