Chemistry: electrical and wave energy – Processes and products – Electrostatic field or electrical discharge
Patent
1991-05-06
1993-09-07
Valentine, Donald R.
Chemistry: electrical and wave energy
Processes and products
Electrostatic field or electrical discharge
2041295, 2041297, 20412975, 204DIG9, B23H 300
Patent
active
052425568
ABSTRACT:
The invention relates to a method of electrolytically machining the surface of a workpiece by applying positive and negative electric current pulses alternately and repeatedly across the workpiece and a tooling electrode located oppositely in a neutral electrolyte so as to keep a predetermined gap therebetween, wherein the time interval from a negative pulse to a positive pulse is shorter than that from the positive pulse to the next positive pulse. The invention also relates to an apparatus for attaining the method comprising: a device for supporting the workpiece in an electrolytic machining tank; a device for supporting an electrode opposite to the workpiece so as to keep the gap; a power supply means for repeatedly applying across the workpiece and the electrode an electric current waveform wherein its polarity changes alternately and the time interval from a negative pulse to a positive pulse is shorter than that from the positive pulse to the next negative pulse; a device for supplying an electrolyte between the workpiece and the electrode; and a control system for controlling the workpiece fixing device, the electrode supporting device, the power supply means and the electrolyte supplying device.
REFERENCES:
patent: 3616346 (1971-10-01), Inoue
patent: 3654116 (1972-04-01), Inoue
patent: 4097710 (1978-06-01), Maillet
patent: 4842702 (1989-06-01), Kuwabara et al.
Valentine Donald R.
Yoshida Kogyo K.K.
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