Electric heating – Metal heating – Cutting or disintegrating
Patent
1993-03-08
1994-10-18
Evans, Geoffrey S.
Electric heating
Metal heating
Cutting or disintegrating
B23H 104
Patent
active
053570731
ABSTRACT:
An electrode for electrical discharge machining. This spark-machining electrode improves the accuracy at which the workpiece is machined by electrical discharge machining. The electrode can dispense with a mechanism which scans the spark-machining electrode or the workpiece. A plurality of needlelike electrodes are formed on the surface of the spark-machining electrode. The needlelike electrodes are so arranged that they are present in craters created by their respective adjacent needlelike electrodes. The plural electrodes form a group. The shape of the surface of this group is formed according to the desired shape to be formed in the workpiece. Art electric discharge occurs mainly at the tips of the needlelike electrodes and so the capacitance is smaller than the capacitance of the prior art flat-plate electrode. Also, the energy of a single electric discharge can be reduced. Furthermore, electric discharge at the side surfaces of the needlelike electrodes can be suppressed because of the effect of concentration of electric field.
REFERENCES:
patent: 4121081 (1978-10-01), Baker
patent: 4467200 (1984-08-01), Kalwar et al.
patent: 5286944 (1994-02-01), Li
Precision Machining of Micro Spindles (1st Report) Masuzawa, T. et al. pp. 14-23 No Publication Date.
Precision Machining of Micro-holes and Micro-punches with EDM, Sato, T. et al.-pp. 29-33 No Publication Date.
Sakakibara Appln. No. 07/935,104 No Publication Date.
Hattori Tadashi
Hisanaga Michio
Tominaga Takayuki
Evans Geoffrey S.
Nippondenso Co. Ltd.
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