Abstract
This study deals with the feasibility of a position detection method of the electrode being used in curved hole electrical discharge machining (EDM) by means of elastic wave measurement. To establish a curved hole ma-chining method, the devices have been developed, which can machine curved holes. At present, the authors have developed the 3-dimensional long curved hole EDM system which consists of an in-pipe movable mechanism, a machining direction determining device and an die-sinking electrical discharge machine. The system has the ability to fabricate long and various curved holes like an earthworm does. In machining a curved hole by using the system, the electrode position cannot be known because whole electrode is inside a workpiece. This means that it is impossible to monitor the position of the electrode under machining and to feed back the electrode position to the system so that a designed curved hole is made. To solve the problems, a electrode position detecting device is developed, which can pinpoint electrical discharge positions by measuring elastic wave generated by EDM by means of acoustic emission (AE) sensors. From the results of the basic experiments, it is found that the device has the ability of electrode position detection.
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