Wire Electrical Discharge Machining (WEDM) belongs to the category of electrical machining. When the couple of the former Soviet Union Lazarenko studied the phenomenon and cause of damage to the switch contacts by spark discharge corrosion, they found that the instantaneous high temperature of electric spark can The local metal is melted, oxidized and corroded, thereby initiating and inventing the electric discharge machining method.
Physical principle
Free positive ions and electrons accumulate in the field and quickly form an ionized conductive channel. At this stage, current flows between the two plates. Resulting in numerous collisions between the particles, forming a plasma zone, and quickly rising to a high temperature of 8000 to 12000 degrees, instantaneously melting some materials on the surfaces of the two conductors, at the same time, due to the vaporization of the electrode and the dielectric fluid, forming a bubble, And its pressure rules rise until very high. Then the current is interrupted, the temperature drops suddenly, causing the bubbles to explode inwardly, the generated power throws the melted substance out of the crater, and then the corroded material re-condenses into small spheres in the dielectric fluid and is drained away by the dielectric fluid. Then through the monitoring and management of NC control, the servo mechanism executes to make this discharge phenomenon uniform.
EDM wire classification
Distinguish between fast wire cutting, medium wire cutting and slow wire cutting. 1: The wire-traveling speed of the fast-wire EDM wire cutting is 6～12 mm/s, and the electrode wire performs high-speed reciprocating motion, and the cutting accuracy is poor. 2: Medium wire EDM wire cutting is a new technology developed in recent years that realizes the frequency conversion multiple cutting function on the basis of fast wire cutting. 3: The wire-traveling speed of the slow-wire EDM wire cutting is 0.2mm/s, and the electrode wire performs low-speed unidirectional movement, and the cutting accuracy is very high.
