Advanced Machining Processes: Electrical-Discharge Machining (EDM)
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Questions and Answers

What is the function of the electrode in Electrical-Discharge Machining (EDM)?

  • To control the speed of the spark discharges
  • To provide cooling to the workpiece during the machining process
  • To apply pressure on the workpiece for better surface finish
  • To direct high-frequency electrical spark discharges to disintegrate electrically conductive materials (correct)

    • What is the purpose of the dielectric fluid in Electrical-Discharge Machining (EDM)?

  • To reduce the temperature of the workpiece
  • To improve the electrical conductivity of the workpiece
  • To separate the tool (cathode) and workpiece (anode) during the machining process (correct)
  • To lubricate the electrode for smooth movement

    • How does adjusting the gap clearance between the tool and workpiece affect the EDM process?

  • It allows spark discharge and can be adjusted to match machining conditions such as material removal rate (MRR) (correct)
  • It decreases the speed of the spark discharges
  • It helps in reducing the wear of the electrode
  • It increases the temperature of the workpiece

    • What will happen to the material removal rate (MRR) in Electrical-Discharge Machining if there is an increase in the melting point and latent heat of the material being machined?

    <p>The MRR will decrease</p> Signup and view all the answers

    What is the primary factor affecting material removal rate (MRR) in Electrical-Discharge Machining (EDM)?

    <p>Current intensity and time</p> Signup and view all the answers

    What is the main function of the dielectric fluid in Electrical-Discharge Machining (EDM)?

    <p>To act as a coolant and insulator during the machining process</p> Signup and view all the answers

    What are the common tool materials used in Electrical-Discharge Machining (EDM)?

    <p>Copper, brass, and graphite</p> Signup and view all the answers

    Which type of materials can Electrical-Discharge Machining (EDM) be applied to?

    <p>All electrically conducting metals &amp; alloys</p> Signup and view all the answers

    What is a disadvantage of Electrical-Discharge Machining (EDM) in terms of material removal rate (MRR)?

    <p>MRR is very low</p> Signup and view all the answers

    What is the primary source of energy used in Laser-Beam Machining (LBM)?

    <p>Laser</p> Signup and view all the answers

    Which of the following is NOT a type of laser used in Laser-Beam Machining (LBM)?

    <p>Halogen lasers</p> Signup and view all the answers

    What does LBM's peak energy densities of laser beams range from?

    <p>$5 to $200 kW/mm2</p> Signup and view all the answers

    In Laser-Beam Machining, what is the function of the laser beam?

    <p>To melt &amp; evaporate portions of the workpiece in a controlled manner</p> Signup and view all the answers

    What environment can the laser operate in during Laser-Beam Machining (LBM)?

    <p>&quot;Not necessarily&quot; any transparent environment including air, inert gas, vacuum, and even certain liquids</p> Signup and view all the answers

    What is the primary function of the electrode in Electrical-Discharge Machining (EDM)?

    <p>To direct high-frequency electrical spark discharges to disintegrate electrically conductive materials</p> Signup and view all the answers

    How does an increase in the melting point and latent heat of the material being machined affect the material removal rate (MRR) in Electrical-Discharge Machining (EDM)?

    <p>It decreases the MRR</p> Signup and view all the answers

    What is the purpose of the dielectric fluid in Electrical-Discharge Machining (EDM)?

    <p>To separate the tool (cathode) and workpiece (anode) during the machining process</p> Signup and view all the answers

    What are the components of Electrical-Discharge Machining (EDM) used to direct high-frequency electrical spark discharges to disintegrate electrically conductive materials?

    <p>Dielectric fluid and electrodes</p> Signup and view all the answers

    What is the main function of the dielectric fluid in Electrical-Discharge Machining (EDM)?

    <p>To separate the tool (cathode) and workpiece (anode) during the machining process</p> Signup and view all the answers

    What is the effect of an increase in the melting point & latent heat of material on the material removal rate (MRR) in Electrical-Discharge Machining (EDM)?

    <p>It decreases MRR</p> Signup and view all the answers

    What are the important characteristics of Electrical-Discharge Machining (EDM)?

    <p>Tool materials, workpiece materials, process parameters, and material removal</p> Signup and view all the answers

    What is a disadvantage of Electrical-Discharge Machining (EDM) related to power requirement?

    <p>Very high power requirement compared to conventional processes</p> Signup and view all the answers

    What type of workpiece can be machined using Electrical-Discharge Machining (EDM) without distortion?

    <p>Fragile and slender workpieces</p> Signup and view all the answers

    What is the primary source of energy used in Laser-Beam Machining (LBM)?

    <p>Optical energy from a laser</p> Signup and view all the answers

    What is the function of the laser beam in Laser-Beam Machining (LBM)?

    <p>To melt and evaporate portions of the workpiece</p> Signup and view all the answers

    What is a disadvantage of Electrical-Discharge Machining (EDM) related to sharp corners?

    <p>It cannot produce sharp corners</p> Signup and view all the answers

    Which parameter affects the cutting depth in Laser-Beam Machining (LBM)?

    <p>Laser beam power input</p> Signup and view all the answers

    What is a characteristic advantage of Laser-Beam Machining (LBM) related to operating environment?

    <p>It operates in any transparent environment including air, inert gas, vacuum, and certain liquids</p> Signup and view all the answers

    What can be effectively used for welding of dissimilar metals in Laser-Beam Machining (LBM)?

    <p>Welding of dissimilar metals</p> Signup and view all the answers

    What type of materials can Electrical-Discharge Machining (EDM) be applied to?

    <p>All electrically conducting metals and alloys</p> Signup and view all the answers

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