Electric heating – Metal heating – Cutting or disintegrating
Patent
1997-02-26
1998-11-17
Evans, Geoffrey S.
Electric heating
Metal heating
Cutting or disintegrating
219 6911, B23H 106
Patent
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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Imai Yoshihito
Magara Takuji
Miyake Hidetaka
Sato Tatsushi
Sendai Tomoko
Evans Geoffrey S.
Mitsubishi Denki & Kabushiki Kaisha
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