Today at the Mechanical post we’ll see What is electric discharge machining? its construction, working, applications, advantages, and limitations.
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What is electric discharge machining?
Principle of electric discharge machining
Construction of Electric discharge machining
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- DC pulse generator
- Dielectric fluid
- Tool holder
DC pulse generator
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Working of Electric discharge machining
- The tool and the workpiece are both immersed in the dielectric fluid and separated by a small gap in between known as a spark gap.
- When the power supply is turned ON, thousands of sparks are produced. However, the duration of each spark is very short.
- The sparks cause the nearby dielectric fluid to ionize, due to which the dielectric fluid acts as a conductor.
- The spark causes intense heat generation due to which the workpiece material gets melted.
- This molten material is carried away by the flow of dielectric fluid, thus cooling the workpiece and tool.
- The dielectric fluid is then filtered and then recirculated.
- As the material is removed the servo motor provides suitable feed to constantly maintain the spark gap.
- This is how the material is machined using the electric discharge machining process.
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Advantages of electric discharge machining
- EDM can be used to machine any type of material.
- Complex shapes that are difficult to produce using conventional machining processes can be produced using EDM.
- Machining with very tight tolerances is possible.
- A good surface finish is obtained.
- As there is no contact between the tool and workpiece, mechanical stresses are not developed.
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Limitations of electric discharge machining
- High power consumption.
- The material removal rate is less.
- Sharp corners cannot be produced.
- EDM can be only used for electrically conductive materials.
- There is a formation of overcut.
- Tapered holes are produced.
Applications of electric discharge machining
- It can be used to produce very small holes.
- By using a rotary spindle, threads can be produced.
- It is also used for gear manufacturing.
- It is also used in the aerospace industry for machining.
- EDM is also used for manufacturing extrusion dies, stamping tools, etc.
That’s an overview of Electric discharge machining. If you like this post or have any suggestions do let us know in the comments we would love to hear from you.
We’ll be back soon with another interesting article till then Keep learning and read The Mechanical post!