Chemistry: electrical and wave energy – Processes and products – Electrostatic field or electrical discharge
Patent
1990-02-02
1991-04-02
Valentine, Donald R.
Chemistry: electrical and wave energy
Processes and products
Electrostatic field or electrical discharge
204224M, 204228, B23H 302
Patent
active
050045288
ABSTRACT:
In the operation of an electro chemical machine, damage can occur if there is direct electrical contact between the workpiece and the machine tool. Such contact causes a rise in machining current, and to detect this, signals representing the current are fed in a series of successive time periods to two peak detectors (34,36) alternately. The maximum value of the current in one period, detected by one peak detector (34,36), is compared by a differential amplifier (42) with the maximum value of the current detected by the other peak detector (34,36) in an immediately succeeding time period. If the difference, corresponding to a rise in current, exceeds a predetermined threshold value, determined by a window detector 46, a relay 48 is operated to disable the electro chemical machine.
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patent: 4545874 (1985-10-01), England
patent: 4672161 (1987-06-01), Inoue
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Rolls-Royce plc
Valentine Donald R.
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