1. A reasonable distance must be maintained between the tool electrode and the workpiece electrode. Within this distance range, the pulse voltage can continuously break down the medium and generate spark discharge, and it can also meet the requirements of deionization of the medium and discharge of corrosion products after the spark channel is extinguished. If the distance between the two electrodes is too large, the pulse voltage cannot break down the medium and spark discharges cannot be generated. If the two electrodes are short-circuited, there will be no pulse energy consumption between the two electrodes, and it is impossible to achieve electrical corrosion processing.
2. the pulse discharge needs to be repeated many times, and the multiple pulse discharges are dispersed in time and space. This has two meanings:
One of the two adjacent pulses in time does not form a channel at the same point;
Second, if the pulse discharge occurs concentratedly in a certain area within a certain period of time, the pulse discharge should be transferred to another area within another period of time. Only in this way can carbon deposition be avoided, thereby avoiding arcing and local burns.
3. The pulse energy density delivered between the two electrodes should be large enough. After the spark channel is formed, the pulse voltage does not change much, so the current density of the channel can characterize the energy density of the channel. The energy density is large enough to locally melt or vaporize the processed material, thereby forming a corrosion mark (pit) on the surface of the processed material to realize EDM. Thus, the channel must generally have a current density of 105-106 A/cm2. The discharge channel must have a sufficiently large peak current that the channel can be maintained during the pulse. In general, the peak current to maintain the channel is not less than 2A.
4. The galvanic corrosion products after the pulse discharge can be discharged to the outside of the discharge gap in time, so that the repetitive discharge can be carried out smoothly. In the production practice of EDM, the above process is completed in two ways.
On the one hand, the spark discharge and electrocorrosion process itself has the inherent characteristics of removing the corrosion products; other discharge products other than the corrosion products (such as the vapor of the medium) can also promote the above process;
On the other hand, some artificial auxiliary process measures must be used, such as circulating filtration of working fluid, flushing and oil pumping measures used in processing, etc.
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