| 摘要 |
A sintered electrode for electric discharge machining comprises a continuous phase consisting of a conductive region ( 3 ), and a dispersed phase consisting of microscopic polycrystalline diamond ( 2 ) dispersed in the continuous phase. The conductive region ( 3 ) is cobalt, nickel, cobalt nickel alloy or cemented carbide and imparts conductivity to the electrode ( 1 ). The microscopic polycrystalline diamond ( 2 ) imparts excellent mechanical strength and thermal diffusion to the electrode ( 1 ). The electrode ( 1 ) and the workpiece ( 5 ) are connected to a power supply (V 1 ) in reverse polarity and a current pulse having ON-time of 60 mu seconds or less and 1 mu second or more and peak of 15 A or less and 1 A or more is supplied to the electrode ( 1 ) from the power supply (V 1 ).
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