Abstract
In single discharge machining of a 0.1mm tungsten electrode with discharge current of between 30 to 50A and pulse duration of several hundreds microseconds, a needle of 20 to 35μm in diameter has been produced instantaneously. In the 1st report, we studied the effect of the discharge conditions on the shape of the formed electrode's tip. However, the forming mechanism could not be understood clearly from several experiments in the 1st report. To understand this phenomenon, a stroboscopic imaging system with a Q-switched Nd:YAG laser is used to observe the dynamical change of the electrode during and after the discharge pulse. Formation of the needle-shaped electrode occurs after a single discharge in an interval of 100 to 300μs. Therefore, the electrostatic or electromagnetic force may not be considered to have an effect on the thin electrode formation phenomenon. Air currents are suggested as one possible contributor to the formation mechanism and its effect on wear length for positive and negative electrode polarities is discussed.
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