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1. SEMINAR TOPIC ON:-
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2. CONTENTS:-
 INTRODUCTION
 MECHANISM
 TOOL MATERIAL
 MEDIUM
 MECHINING RATIO
 ADVANTAGES
 DISADVANTAGES
 APPLICATION
 CONCLUSION
 REFERENCES
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3. INTRODUCTION
Electron Beam Machining
 EBM is a metal removal process by a high
velocity focused stream of electrons. As
the electrons strike the work piece with
high velocity ,their kinetic energy is
transformed into thermal energy which
melts and vaporizes the material.
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5. MECHANISM OF EBM:-
 The complete EBM setup is enclosed in a
vacuum chamber which carries vacuum of
the order of 10^-5mm of mg .
 This chamber carries a door through which the W/P
is placed over the tool then the door is enclosed .
 The electro gun is mainly responsible for emission
of electrons consists of 3 main parts these are
(1)tungsten filament
(2)grid up
(3)anode
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6. EBM
Tungsten
filament
Grid cup
anode
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7.  The filament is connected to the
negative terminal & acts as cathode.
 Similarly anode is connected to positive
terminal & acts as anode.
 A potential difference of 50-150 kilo volt
is maintain between to the filament &
anode .due to high voltage .the filament
weir is heated to a temperature of about
2500c with system with the result cloud
of electron is emitted by the filament
,which is directed by the grid cup to
travel downward .
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8.  Then this high velocity electro beam passes
through the tungsten diaphragm & then
electromagnetic lens .the electro magnetic lens
converge the stream of electro beam to a one
point that is sport on the W/P.
 The electro magnetic deflector coil deflect the
electromagnetic beam on to the W/P through
which the path of the cut can control .
 The table on which the W/P is loaded can also
be to feed the W/P is needed when the high
velocity electro beam impinge on the W/P the
K.E of the electro beam is converted in to the
heat hence the material removal process is
done.
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9. TOOL MATERIAL
ELECTRON GUN
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10. MEDIUM:-
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VACUUM
Medium is used in perfect vacuum which is a order of 10^-5mm
of Mg

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12. MECHINING RATIO
MECHININGRATIO=
material removal rate/tool wear
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13. ADVANTAGE
 Any material can be machined.
 In any physical or casting damage so tool
wear is zero so close dimension can be
achieved.
 It is an excellent for micro machining .
 Heat can be concentrated on a vertical spot
on the W/P.
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14. DISADVANTAGES
 Maintaining perfect vacuum is very difficult.
 W/P size is limited due to the requirement of
vacuum chamber.
 Out of all unconventional process EBM gives
lowest material removal rate.
 Power consumption is very high.
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15. APPLICATION:-
 Micro drilling operation up to (0.002mm)for
thin orifice dias for wear drawing , part of
electro microscope & injector nozzles for
diesel engine .
 Very effective for material of low heat
conductivity & high melting point.
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