Electrolysis: processes – compositions used therein – and methods – Electrolytic erosion of a workpiece for shape or surface... – Gap maintenance or defined tool-workpiece gap
Patent
1998-10-05
2000-08-08
Gorgos, Kathryn
Electrolysis: processes, compositions used therein, and methods
Electrolytic erosion of a workpiece for shape or surface...
Gap maintenance or defined tool-workpiece gap
205672, 204224M, B23H 300
Patent
active
06099715&
ABSTRACT:
During continuous electrochemical polishing of a metallic workpiece an electrolyte flows through a cathodic part of a tool into a working gap formed between the cathodic part and the workpiece and leaves it through a discharge channel between the cathodic part and a wall of the tool. Between the tool's wall and the workpiece a clearance is formed bordering the working gap. To avoid flow of the electrolyte from the working gap into the clearance and to discharge fluid from the gap, a chamber is provided which contains an external fluid held under a pre-adjusted pressure, which can be above or below atmospheric pressure in relation to the pressure of the electrolyte in the working gap. The fluid's pressure is adjusted so, that at the beginning of the clearance a barrier against the penetration of electrolyte liquid is formed. At this barrier the electrolyte is separated from the surface of the workpiece alongside a distinctive breakaway edge. Due to this the polishing treatment results in a constantly good high-polishing surface without any discolorations.
REFERENCES:
patent: 3293163 (1966-12-01), O'Connor
patent: 3616343 (1971-10-01), Inoue
patent: 4222834 (1980-09-01), Bacon et al.
patent: 4486279 (1984-12-01), Fromson et al.
patent: 5378331 (1995-01-01), Kemp
European Search Report for European Appln. No. 98114849.7, dated Jan. 19, 1999.
Gorgos Kathryn
Smith-Hicks Erica
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