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This paper deals with an electrode feeding device based on AZARASHI mechanism for microhole electrical discharge machining. This device has a controlled friction device, a friction device for applying a constant friction and an extension device for changing the distance between the friction devices. To adjust the friction easily, a stacked piezoelectric actuator was embedded in a displacement magnification system for the controlled friction device, and a constant friction was applied with a coil spring. The performance of the concurrent machining in the case of using two devices was compared with that in the case of using a single device. The two devices were concurrently controlled with a digital signal processor. The piercing of each tool electrode was detected by the electric contact between the tool electrode and a target plate in the concurrent machining. The machining time and accuracy were the same in the both cases. : small-hole machining, miniaturized electrode feeding device, piezoelectric actuator

Electrode Feeding Devices Based on AZARASHI (Seal) Mechanism for Small-Hole Electrical Discharge Machining