Electrical discharge machining/EDM Machining and its application
Electro-discharge machining (EDM), also known as spark machining, spark erosion, burning, mold sinking, wire burning, or wire erosion, is a manufacturing process that uses discharge (spark) to obtain the desired shape. The material is removed from the workpiece by a series of rapid and repeated current discharges between the two electrodes, separated by the dielectric fluid and subjected to voltage. One of the electrodes is called a tool electrode, or simply "tool" or "electrode," while the other is called a workpiece electrode or "workpiece." This process depends on the actual contact between the tool and the workpiece.
Electro-discharge machining is a processing method that is mainly used for hard metals, or is a processing method that is difficult to process using conventional techniques. EDM is generally applied to materials with electrical conductivity, but methods have also been proposed for machining insulating ceramics with EDM. EDM can cut intricate contours or cavities in pre-hardened steel without the need for heat treatment to soften and re-harden them.This method can be used with various material, such as steel, titanium and inconel.
EDM processes are most widely used in the tooling, tooling, and tooling industries, but are becoming a common method of manufacturing prototypes and production parts, particularly in the relatively low volume of aerospace, automotive, and electronics industries. In sinker discharge machining, graphite, copper tungsten or pure copper electrodes are machined to the desired (negative) shape and fed into the workpiece at the end of the vertical ram.
On wire cutting EDM machines use a small hole to drill a hole in the workpiece to form a through hole through which the wire is cut into a wire-cut EDM operation. An EDM head dedicated to small hole drilling is installed on the inline cutting machine and allows the large hardened sheet to be eroded on the finished product as required without prior drilling.