Realizing Study Of The Current Control Influencing The Carbon Deposition Of Electrode

In EDM, the electrode loss is one of the main factors which induce mismachining tolerance. In order to improve the accuracy of processing and shorten the processing cycle, improve the utilization of EDM equipment, we should master the law of electrode loss and try to reduce the loss, it is very important. Forming a fine carbon deposition layer on the anode electrode surface can reduce the electrode loss or even make no electrode loss. And the discharge current is the most important factor of carbon deposition thickness. So it is necessary to research generating law of carbon deposition layer of electrode and how the discharge current influences the levels of carbon deposition, to find an effective low-loss strategy.The conditions and the main factors of carbon deposition were analyzed. Comminuting experiment and theory, step current waveform was found which can reduce the electrode loss and provided a low-electrode-loss strategy based on the current slope control. An intelligence pulse generator controlled by MCS89C51 MCU is designed to produce the step up the current wave with power amplifier circuit. The pulse generator can detect distance disruption and work in a high-and low-voltage compound and isopulse way. By controlling the thickness of the carbon deposition layer of electrode, process can carry with low loss. The output waveform of the circuit is simulated in software and was tested with equipment and then processing experiments carried out on EDM machine tool. The results show that the program is conducive to the formation of carbon deposition layer and can be an effective way to reduce electrode loss.