Which material is used for electrical discharge machining process?

Which material is used for electrical discharge machining process?

EDM involves the direction of high-frequency electrical spark discharges from a graphite or soft metal tool, which serves as an electrode, to disintegrate electrically conductive materials such as hardened steel or carbide.

Which type of electrode is used in electro discharge machining?

Electrical discharge machining. Die-sink EDM and wire-cut EDM are the two basic EDM processes. Both electrodes are submerged in the dielectric fluid when using die-sink EDM, wire-cut EDM cuts a plate workpiece via a moving wire electrode, which is made of a brass, copper, zinc and silicon ingot.

What metals can be used as electrodes?

Metal based electrodes include stainless steel plate, stainless steel mesh, stainless steel scrubber, silver sheet, nickel sheet, copper sheet, gold sheet, and titanium plate. Some of the electrode materials were developed in porous structures to allow for higher surface areas as well as adsorption of contaminants.

What are the criteria for selecting electrode material in EDM?

EDM electrode materials need to have properties that easily allow charge and yet resist the erosion that the EDM process encourages and stimulates in the metals it machines. Alloys have properties which provide different advantages based on the needs of the application. Brass is an alloy of copper and zinc.

How does electro discharge machining work?

Electrical Discharge Machining (EDM) is a controlled metal-removal process that is used to remove metal by means of electric spark erosion. The metal-removal process is performed by applying a pulsating (ON/OFF) electrical charge of high-frequency current through the electrode to the workpiece.

Which the following is true for electrical discharge machining EDM?

Which the following is true for Electrical Discharge machining (EDM)? Any electrical conductor can be machined by this method. Some light oil like transformer oil or kerosene oil is used as dielectric.

What are the types of electrical discharge machining?

What is the Electrical Discharge Machining (EDM) process?

• EDM is a non-traditional manufacturing process that uses thermal energy to remove material from a workpiece as opposed to mechanical force.
• Electric discharge machining can be divided into three common types, Die sinking EDM, Wire EDM and hole drilling EDM.

Why is zinc not used for electrodes?

The electrolysis is similar to that of copper (II) sulfate solution with inert electrodes. The answer key says that zinc would be formed at the cathode. However, zinc is more reactive than hydrogen, so logically hydrogen should be given off at the cathode, not zinc.

Which metal is used in electrode iron?

Silver metals
Detailed Solution The correct answer is Silver. Silver metals are used to electrode iron material. Silver is a chemical element with the symbol Ag and atomic number 47. A soft, white, lustrous transition metal.

Why dielectric medium is used in EDM?

Dielectric is an important parameter in EDM and plays a crucial role in determining high material removal rate (MRR) and surface finish during operation. The dielectric fluid behave as a medium which controls the electrical discharge and absorb heat during process.

How are EDM electrodes made?

The EDM process uses custom machined electrodes (typically made from graphite or copper) which creates a spark between the material being machined and the electrode. The spark erodes material in the EDM tools pathway, creating the complex cavities or shapes desired.

Why flushing is essential in electro discharge machining?

Abstract—Flushing is a very important function in any electrical discharge machining (EDM) operation. It not only serves to remove the eroded debris from the spark-gap region but also has various other functions which highly influence the outcome of this machining pro- cess.

What kind of materials are used for EDM electrodes?

EDM electrode materials need to have properties that easily allow charge and yet resist the erosion that the EDM process encourages and stimulates in the metals it machines. Alloys have properties which provide different advantages based on the needs of the application. Brass is an alloy of copper and zinc.

What kind of machining is electrical discharge used for?

Electrical discharge machining is a machining method primarily used for hard metals or those that would be very difficult to machine with traditional techniques.

Which is better for EDM, brass or copper?

EDM wire does not need to provide wear or arc erosion resistance since new wire is fed continuously during the EDM wiring cutting process. Copper and copper alloys have better EDM wear resistance than brass, but are more difficult to machine than either brass or graphite.

What happens to the dielectric in electrical discharge machining?

Electrical discharge machining. Once the current stops (or is stopped, depending on the type of generator), new liquid dielectric is usually conveyed into the inter-electrode volume, enabling the solid particles (debris) to be carried away and the insulating properties of the dielectric to be restored.