During the discharge operation of the EDM machine, there is no actual contact between the electrode and the workpiece. The discharge of the EDM machine only penetrates the workpiece through the instantaneous high voltage through the current, and forms a model on the surface of the workpiece through countless penetrations. With the same use of EDM machine discharge, is there any way to make the mold produced by EDM machine more beautiful? This is exactly what BKN wants to share with you. Let's take a look at the details that need to be grasped during the discharge process of the EDM machine:
A reasonable distance must be maintained between the EDM equipment tool electrode and the workpiece electrode. In this distance range, the EDM machine pulse voltage can not only continuously break down the medium and generate spark discharge, but also meet the requirements of the corrosion product discharge after the medium deionization and spark channel extinguishing. If the distance between the two electrodes of the EDM machine is too large, the pulse voltage cannot decompose the medium, nor can it produce spark discharge. If the two electrodes are short-circuited, there is no pulse energy consumption between the two electrodes, and it is impossible for the EDM machine to achieve electro-erosion treatment.
The pulse discharge of the EDM machine needs to be repeated many times, and multiple pulse discharges are scattered in time and space.
The pulse energy density transmitted by the EDM machine between the two electrodes should be large enough. After the spark channel is formed, the pulse voltage does not change much. Therefore, the current density of the EDM machine channel can represent the energy density of the channel. The energy density is large enough to locally melt or vaporize the processed material, thereby forming corrosion marks (pits) on the surface of the processed material to achieve EDM. Therefore, the channel of the EDM machine must usually have a current density of 105-106A/cm2. The discharge channel must have a sufficiently large peak current so that the channel can be maintained during the pulse. Under normal circumstances, keep the peak current of the EDM machine channel not less than 2A.
The electric corrosion products after the pulse discharge of the EDM machine can be discharged from the discharge gap in time, so that the repeated discharge can be carried out smoothly.