Electron Beam Machining &

Electrical Discharge

Machining

By : Ainin Sofiya Anis Balkis Nadiatul Hafiz Muhamad Ariffin

ELECTRON BEAM MACHININGDEFINITIONElectron beam Machining (EBM) is a process where high velocity electrons concentrated into a narrow beam are directed toward the work piece surface to remove material by melting & vaporization. EBM can be used for very accurate cutting or boring of a wide variety of metals. Surface finish is better and kerf width is narrower than those for other thermal cutting processes.

• Utilize voltages in the range of 150 to 200 kV to accelerate electrons (50% to

80%) .Magnetic lenses are used to focus the

electron beam to the surface of the workpiece.

Requires vacuum.

THE PROCESS

Application of EBM

“◉ Used for producing very small size holes in diesel injection nozzles, air

brakes and more◉ Used only for circular holes

ADVANTAGES OF EBM

◉Very small size holes can be produced◉Surface finish produced is good◉Highly reactive metals like Al and Mg can be

machined very easily

DISADVANTAGES OF EBM

◉Material removal rate is very low compared to other convectional machining processes

◉Maintaining perfect vacuum is very difficult◉The machining process can’t be seen by operator◉Power consumption is exceedingly high

ELECTRICAL DISCHARGE MACHINING

DEFINITIONElectrical Discharge Machining (EDM) is a machining method typically used for hard metals which are electrically conductive. EDM works by eroding material in the path of electrical discharges that form an arc between an electrode tool and the work piece.

• Capasitor discharge at rates between 50kHz and 500kHz with volt between 50V and 380v and currents from 0.1A to 500A.Electrodes are made of high conductive

material.Tool wear related to melting points of

material.Dielectric fluid acts an insulator, flushing

medium and cooling medium.

Wire-EDM

• Uses CNC movement• Does not requires special

electrodes• Uses vertical wire• The electrode is controlled

by the a machine computer to produce the shape required

THE PROCESS

Application of EDM

“◉ Used in the production of die for fabrication of all componants

◉ Used in fabrication, extrusion, blanking, stamping and embossing

dies◉ Also used for removal of drilland

tapes from components

ADVANTAGES OF EDM

◉Generates no cutting forces, permitting the production of small and fragile pieces

◉Burr-free edges are produced◉Intricate details and superior finishes are possible◉Any material that is electrically conductive can be

cut

DISADVANTAGES OF EDM

◉Low metal removal rates ◉High power requirement is needed to produce

specific, consumable electrode shapes◉Material must be highly electrically conductive

THANKS!