Electric heating – Metal heating – Cutting or disintegrating
Patent
1993-04-29
1995-03-21
Evans, Geoffrey S.
Electric heating
Metal heating
Cutting or disintegrating
219 6918, 219 6919, B23H 102
Patent
active
053998260
ABSTRACT:
An electric discharge machining apparatus has a pair of carbide formation detectors for minimizing carbide formation and for preventing abnormal discharges from occurring across the machining gap. If the discharge voltage is below a lower reference voltage for a predetermined period of time and for a predetermined number of ON/OFF cycles, then the first detector compares the discharge voltage with a higher voltage level. When the discharge voltage is greater than the higher level for a predetermined period of time and for a predetermined number of ON/OFF cycles, the first carbide detector generates an ARC STOP signal for halting the machining operation. A second carbide formation detector will generate an ARC STOP signal for halting the machining operation when the discharge waiting time is less than a predetermined period of time for a predetermined number of cycles. By having the two carbide formation detectors, abnormal discharges such as concentrated arc discharges and continuous arcing discharges are prevented. Also, machining efficiency is improved since operator supervision for detecting carbide formation is no longer necessary.
REFERENCES:
patent: 3597570 (1971-08-01), Saito et al.
patent: 3739136 (1973-06-01), Marendaz
patent: 3812317 (1974-05-01), De Bont et al.
patent: 3860779 (1975-01-01), Marendaz
patent: 3875374 (1975-04-01), Inoue
patent: 4453069 (1984-06-01), Inoue
patent: 4504722 (1985-03-01), Kishi et al.
patent: 4700038 (1987-10-01), Dauw
patent: 5023421 (1991-06-01), Bouchoud
Ito Shinji
Kaneko Yuji
Tajima Satoru
Evans Geoffrey S.
Sodick Co. Ltd.
LandOfFree
Electric discharge machining apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Electric discharge machining apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electric discharge machining apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1150638