Process for electro-chemical machining

Details Process for electro-chemical machining Process for electro-chemical machining

1973-02-16

1976-11-09

Edmundson, F.C.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

2041295, 2041296, 204224M, B23P 100, B23P 112

Patent

active

039909590

ABSTRACT:
Electro-chemical drilling of small diameter holes is achieved by placing an electrolyte discharge nozzle in fixed spaced apart relationship with a workpiece, heating the electrolyte passing between the discharge nozzle and the workpiece to increase the current conductivity of the electrolyte up to about 70.degree. C and forcing a jet of electrolyte across the space onto the workpiece. The electrolyte pressure and discharge nozzle orifice length are matched so as to provide an unconfined jet of electrolyte which has a constant diameter so as to obviate the necessity of relative movement between nozzle and workpiece. Increased temperature results in a fine non-conductive mist at the end of the electrolytic jet thereby providing a process for drilling holes of smaller size in the workpiece than prior procedures.
A novel nozzle assembly is also disclosed adapted to produce holes in a workpiece by directing free streams of electrically charged electrolyte at the workpiece. The nozzle assembly has one end wall with several closely spaced orifices formed in the end wall, providing a method of forming more closely spaced holes than would be possible using separate nozzles, each with its own orifice.

REFERENCES:
patent: 3403084 (1968-09-01), Andrews
patent: 3421997 (1969-01-01), Williams
patent: 3467592 (1969-09-01), Eisberg et al.
Electrochemical Machining by DeBaro et al., pub. by American Elsevier Pub. Co., N.Y., N.Y. pp. 201-203.

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