How to start machining the excircle after WEDM?

Make a threaded hole 3 on the outside, cut the inside first, then jump out and cut the shape, draw two concentric circles, that is, one big and one small, and finally cut out the finished product like a washer.

WEDM belongs to the field of electrical machining. Lazarus of the former Soviet Union found that the instantaneous high temperature of electric spark can melt, oxidize and corrode local metals when studying the phenomenon and causes of electric spark damage to switch contacts, thus creating and inventing the electric spark machining method. WEDM was also invented by the former Soviet Union in 1960, and China was the first country to be used in industrial production.

Physical principle

Free positive ions and electrons accumulate in the electric field and soon form ionized conductive channels. At this stage, an electric current is formed between the two plates. It leads to numerous collisions between particles, forming plasma, which quickly rises to the high temperature of 8000 to 12000 degrees, instantly melts some substances on the surfaces of the two conductors, and at the same time, bubbles are formed due to the vaporization of the electrode and dielectric liquid, and its pressure rises regularly until it is very high. Then the current is interrupted, and the temperature drops suddenly, so that the bubbles explode inward, and the generated power throws the dissolved substances out of the crater, and then the corroded substances re-condense into small balls in the dielectric liquid and are discharged by the dielectric liquid. Then through the monitoring of numerical control and the execution of servo mechanism, this discharge phenomenon is uniform.