Electric discharge machining apparatus

Electric heating – Metal heating – Cutting or disintegrating

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219 6911, B23H 106

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active

058379576

ABSTRACT:
An electric discharge machining apparatus in which at least either of a tool electrode or a workpiece is made of an anisotropic conductive material, includes, on a good conductive surface 20b of the anisotropic conductive material 2, a portion for connecting an isotropic conductive member 22. Electric discharge is generated on the good conductive surface 20b of the anisotropic conductive material 2. A conductive adhesive agent 23 is employed to bond the anisotropic conductive material 2 and the isotropic conductive member 22 to each other. The anisotropic conductive material is a pyrocarbon material. The pyrocarbon heat resolved carbon material is employed as a tool electrode material. Incombustible dielectric fluid, such as pure water, is employed as dielectric fluid. Moreover, there are provided apparatus for measuring voltage during electric discharge, apparatus for setting a threshold value for use to determine whether the electric discharge is normal electric discharge or abnormal electric discharge and apparatus for interrupting supply of a discharge current in a case where the measured discharge voltage is higher than the threshold value.

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Petithumbert, J., "Elektroden aus dictem Graphit fur funkenerosive Bearbeitung" in TZ. F. prakt. Metallbearbeitung, 1969, year 63, vol. 1, pp. 11-12.
Astract of SU 443,738, "Electrode tool material comprises nuclear pyrolitic graphite for use in electroerosion processes", Dec. 1981.
Asian Electrical-Machining Symposium '95 and Annual Meeting of Jseme by The Japan Society of Electrical-Machining Engineer, pp. 163-166, published Oct. 31, 1995.

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