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How is classification of Non-traditional Machining done? Show the classification using a chart.

Mumbai University > Mechanical Engineering > Sem 5 > Production process 3

Marks: 5 M

Year: Dec 2014

1 Answer
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Introduction:

  • Non-traditional machining process is defined as a group of processes that remove excess material by various techniques involving mechanical, electrical, chemical and thermal energy used in non-traditional machining process.
  • Extremely hard and brittle material is difficult to machine by traditional machining process such as turning, boring, drilling, shaping and milling.
  • Non-traditional machining is also called advance manufacturing process.
  • Several types of non-traditional machining processes have developed to better machining condition.
  • When these machines are employed, they are many advantages over the traditional machining process.

Classification of non-traditional machining is based on following factors

  • Mode and type of Energy: Mechanical, Electro-chemical, Chemical, Thermo-electric etc
  • Energy source: Pneumatic or Hydraulic, High current or voltage, mechanical pressure
  • Medium of energy transfer: High velocity particles, physical contact, electrolyte, radiation etc
  • Metal removal mechanism: Vaporization, Erosion, spark erosion etc.

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Electro discharge machining (EDM):

Working of Electro discharge machining (EDM) :

  • The diagram of electro discharge machining shown in figure.

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Electro Discharge Machine construction and working

  • This is also called spark erosion, electro-erosion machining.
  • EDM is thermal erosion process whereby material is melted and vaporized from an electrically conductive work piece immerse in a liquid dielectric with a series of spark discharge between the tool electrode and the work piece created by a power supply.
  • The electrode and the work piece are separated by a dielectric medium.
  • The dielectric medium is like as kerosene, paraffin or light oil.
  • The strong electrostatic field between the electrode and work piece produce emission of electrons from the cathode.
  • In this gap between tool and work piece get ionized. The liquid is force to sparking zone.
  • Due to high temperature, the metal at the sparking zone melts instantaneously.
  • The material of the tool is usually a material which conduct electricity and which can be easily shaped.

Advantages of Electro discharge machining (EDM):

  • Smaller holes can be easy machined.
  • No contact between tool and work piece then tool life is increase.
  • Any complex shape can be machined.

Disadvantages of Electro discharge machining (EDM):

  • Tool life doesn’t long last
  • Power consumption is high.
  • Cycle time is more.
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