News Center
Track the news, focus on the news
EDM principle
2023-05-31
During EDM, one pole of the pulse power supply is connected to the tool electrode and the other pole to the workpiece electrode, both poles are immersed in a liquid medium with a certain degree of insulation (commonly paraffin or mineral oil or deionised water). The tool electrode is controlled by an automatic feed adjustment device to ensure that the tool and workpiece maintain a small discharge gap (0.01-0.05mm) during normal processing.
When the pulse voltage is applied between the two electrodes, the liquid medium near the point between the electrodes is broken through under the prevailing conditions, forming a discharge channel. As the cross-sectional area of the channel is very small, the discharge time is extremely short, resulting in a high concentration of energy (10-107W/mm), and the instantaneous high temperature generated in the discharge area is sufficient to melt or even evaporate the material, resulting in the formation of a small crater.
After the pulse discharge, after a very short interval, the pulse is clicked through the other pole again. As this cycle continues at high frequency, the tool electrode is continuously fed into the workpiece and its shape is reproduced on the workpiece to form the desired surface. At the same time, a small proportion of the total energy is released into the tool electrode, resulting in tool losses.
Feedback
Hello, please leave your valuable ideas We will contact you in time
