This machining method is comparable to a cheese cutter, making a two-dimensional cut in a three-dimensional part.
However, the die is replaced with a very fine electrically charged wire which will work as the electrode. It cuts using the same mechanism as die-sinking. Wire EDM, otherwise known as wire erosion, is commonly used to produce extrusion dies. This sinker EDM process can be depicted in the image below:Įvery aspect of this process, between the servers, power supply, and position of the electrodes, is completely controlled through precision machining.
Edm machining series#
A small amount of the electrode is also often eroded during this process.Īs the series of high-frequency sparks repeatedly removes a small amount of material from the workpiece, the desired shape will begin to take place and be precisely cut out. This vaporises and melts material from the workpiece while dielectric fluid subsequently carries any ejected particles away. The die is slowly lowered towards the workpiece until ‘electric breakdown’ occurs and a spark jumps the ‘spark gap’. A voltage is then induced between the die and the electrically conductive workpiece while submerged in a dielectric fluid like oil. In the first step of this process, an electrode is produced in the reverse shape of the required cavity. This method utilises graphite or copper electrodes, a dielectric fluid, and an electric spark induced between the electrode and the workpiece. It is also the method chosen for solving the sharp internal corner issue when CNC machining.
Die sinking EDMĭie sink EDM (also known as Ram EDM, conventional EDM, or cavity-type EDM) is the best Electro Discharge Machining for creating parts with complex cavities. Types of EDMĮlectric discharge machining can be divided into three common types, Die sinking EDM, Wire EDM and hole drilling EDM. Read on for an introductory guide on EDM machines, the various types of electrical discharge machining available, the EDM processes for each type and the type of EDM machine they use, and what EDM machining process is best for your project. However, EDM manufacturing only works for electrically conductive materials like hardened steel, titanium and aluminium. It is sometimes referred to as Spark Machining since it utilises electrical sparks that are near 8000º C to 12000º C.Įngineers often turn to EDM when machining processes such as CNC milling and CNC turning cannot produce the desired cut, such as sharp internal corners or a particularly deep cavity. What is the electrical discharge machining (EDM) process?Įlectrical discharge machining (EDM) is a non-traditional form of precision machining that uses thermal energy instead of mechanical force to remove material from a workpiece.
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