Chemistry: electrical and wave energy – Processes and products – Electrostatic field or electrical discharge
Patent
1984-05-24
1985-10-08
Valentine, Donald R.
Chemistry: electrical and wave energy
Processes and products
Electrostatic field or electrical discharge
204224M, 204228, B23P 100
Patent
active
045458740
ABSTRACT:
In electrochemical machining, arcing across workpiece and forming electrode can result in both being scrapped. Efforts have been made to detect the electrical signals which develop on occurrence of the spark which normally terminates in an arc. Ordinary electrical noise however, tends to have similar amplitude to that of the spark and so make it difficult for the detection device to differentiate between that noise and spark noise. Consequently the machine tool was disabled though no spark had occurred. The invention enables differentiation between the two noise sources by virtue of detecting the term over which noise occurs. This is achieved by dividing the noise pulses into two trains and passing one train via a pulse delay device 32 to a gate 34 and passing the other train directly to the gate 34. If pulses from both trains arrive at the gate 34 this is indicative of the generation of a spark and the gate 34 emits a signal which is utilized to disable the machine.
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patent: 3652440 (1972-03-01), Dehner
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patent: 4331524 (1982-05-01), Matthes
"Zum Schutz der Elektroden" by Matthes, Jan. 29, 1982.
Rolls-Royce Ltd.
Valentine Donald R.
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