Finishing on the large area of work surface by EDM.

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Abstract
This paper describes the new methods of fine finishing by electro discharge machining (EDM). In order to realize mirror-like surface or glossy surface to the work by EDM, it is necessary to control the pulse current to be small appropriately. With the conventional technology in this field, the attainment of pulse control is very difficult, especially in the case of machining to the work surface which has large scale of area, because of gap storage capacitance between the electrode and the work surface, even if not so much power supply. The present study is an attempt to break through the difficulty pointed above. Multi-divided electrode methods are newly tried. The roughness of 0.5 μmRmax has been achieved to the work with the area of 100 cm2 by 100 divided electrode. And the glossy surface with 2 μmRmax has also been achieved to the 275 cm2 work by resistor (silicon) electrode method which can be considered as an extention of multi-divided electrode.

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