Chemistry: electrical and wave energy – Processes and products – Electrostatic field or electrical discharge
Patent
1989-02-01
1990-07-17
Valentine, Donald R.
Chemistry: electrical and wave energy
Processes and products
Electrostatic field or electrical discharge
2041297, 204224M, 204225, B23H 310, B23H 732
Patent
active
049419552
ABSTRACT:
In a system for electrochemical machining of a workpiece in the form of a flat plate or sheet, the workpiece is supported on a flat first electrode, which is in turn supported on a relatively massive rigid support platform. A second electrode, having a working face defining an area substantially smaller than the area of the workpiece, is supported by a relatively massive framework a slight distance from a working surface of the workpiece in facing relationship therewith to define a working gap therebetween. Electrolyte fluid is introduced under superatmospheric pressure into the working gap through a passage in the second electrode and an opening in the working face thereof. Relative movement is effected between the second electrode and the workpiece longitudinally thereof while an electrical potential is applied across the electrodes to establish current flow between the workpiece and the second electrode for removing material from the former. In one version of the invention the platform is moved while the second electrode is maintained stationary, while in another version the second electrode is moved while the workpiece is maintained stationary. Sensor means and control means are provided for controlling the rate of relative movement between the workpiece and the second electrode and the adjustment of the working gap.
REFERENCES:
patent: 3223610 (1965-12-01), Inoue
patent: 3305470 (1967-02-01), Williams et al.
patent: 3753878 (1973-08-01), Gosger
patent: 3900376 (1975-08-01), Copsey et al.
patent: 4127459 (1978-11-01), Jumer
patent: 4290867 (1981-09-01), Jumer
Article entitled "Electrochemical Machining" by A. H. Meleka and D. A. Glew, Sep. 1977, International Metals Reviews.
The Interlake Companies, Inc.
Valentine Donald R.
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