Why deionized water is used in EDM?

Deionized water has been used as dielectric fluid for micro-electrical discharge machining (micro-EDM) because it gives higher material removal rate and lower tool wear than hydrocarbon oil. … This leads to the unanticipated additional material removal from the workpiece which affects the machining shape and quality.

Why dielectric fluid 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.

Which of the following can be used as dielectric fluid in EDM?

10. Which of the following can be used as dielectric fluids in EDM? Explanation: The dielectric fluids used are kerosene, silicon fluid, ethylene glycol, water in emulsions and distilled water.

Which dielectric medium in EDM is used for?

Explanation: Dielectric in EDM is used for flushing away the debris generated during the process of machining, which may slow down the material removal rate if not removed instantly.

Is water a good dielectric material?

A dielectric material is defined as a material that is an electrical insulator. An electrical insulator is a material that does not allow the flow of charge. Charge can flow as electrons or ionic chemical species. By this definition liquid water is not an electrical insulator and hence liquid water is not a dielectric.

What is dielectric fluid used for?

What types of fluid can be used as dielectric fluids? Traditionally, dielectric oils have been used to cool transformers, capacitors, high voltage cables and switchgear, providing electrical insulation and suppressing unwanted electrical discharge.

Which dielectric is better for machining by EDM?

the dielectric fluid necessary for machining non conducting materials in Wire EDM is kerosene.

Where is dielectric used?

Dielectric materials are used in many applications such as: Electronic components such as capacitors (responsible for energy storage properties of the device) High-K / low-K materials widely used in Semiconductors to enhance performance and reduce device size (where K refers to permittivity or dielectric constant)

What will happen if electrical discharge machining is done without any dielectric?

So basically, An EDM process must have a dielectric medium. Dielectric behaves as a channel between work and tool. If the dielectric is not present, it means there is no channel between work and tool. It is possible if we use machining inside the vacuum chamber but the tool wear will be high.

Why does kerosene not burn in EDM?

For all these reasons, kerosene doe not catch fire during an EDM operation. In EDM, tool is completely submerged into the Kerosene and that too there is no oxygen available hence the spark cannot sustain. Moreover kerosene is a bad conductor of heat so thats why it is used as a coolent in EDM process.

What are the methods of dielectric flushing?

Various methods for dielectric flushing: (a) suction through electrode (b) suction through workpiece, (c) pressure through velectrode, (d) pressure through workpiece, (e) jet flushing, (f) periodic cycling of electrode [Courtesy: HMT, Bangalore, India]

What is dielectric fluid made of?

Dielectric fluid is any liquid with high dielectric strength and high electrical resistance. It’s an electrical insulator but in the form of a liquid. Common dielectric fluids include plant-based oils and mineral oils since they are inexpensive and readily available.

Is kerosene a dielectric fluid?

Yes, You can answer kerosene oil as dielectric in EDM process. Kerosene possesses all the desirable properties required to be fulfilled by a fluid to be used a dielectric.

How does spark erosion machine work?

Spark erosion is conducted through metal disintegration machines (EDM). These machines use electrodes to send low voltage/ high current electrical charges that melts the designated piece of metal at the same time cold water thermal shocks the molten steel and pulverizes it into micro size pieces and flushes it away.

What is EDM water?

The dielectric fluid, or coolant, used in the wire electrical discharge machining (EDM) process, is deionized water. It serves several purposes: It acts as a semiconductor between the energized wire and the workpiece to maintain stable and controlled conditions for ionization in the spark gap.

How is spark produced in EDM?

Spark machining is a subtractive machining process that attains a desired shape by producing sparks that melt tiny portions of a metal workpiece. It is also known as Electrical Discharge Machining (EDM), spark eroding, burning, die sinking, wire burning, and wire erosion.

Is dielectric fluid is a good conductor of electricity?

This separation of charge or polarization reduces the electric field within the dielectric material. Hence the dielectric material develops an electric field with the minimum loss of energy. We can say that dielectric material conducts electricity and is a poor conductor.

What are the use of deionized water in dielectric fluid?

Deionized water is used for wire-EDM and high precision die-sinking because of its low viscosity and carbon-free characteristics. The dielectric fluid is flushed through the spark gap to remove gaseous and solid debris during machining and to maintain the dielectric temperature by acting as coolant also.

What is the principle of EDM?

Principles of EDM

Electrical Discharge Machining (EDM) is a controlled metal-removal process that is used to remove metal by means of electric spark erosion. In this process an electric spark is used as the cutting tool to cut (erode) the workpiece to produce the finished part to the desired shape.

Which is not advantage of EDM?

Limitations of EDM / /

EDM requires an electrically conductive workpiece. It will not work on wood, plastics or composites. Material removal rates (MMR) are usually lower than for conventional processes.