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Rui Guo

on 15 December 2012

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Transcript of Dry EDM

Dry Electrical Discharge Machining What is Dry EDM ? Dry electrical discharge machining(DEDM) is a new process based on traditional EDM, but it uses gas instead of liquid as the dielectric fluid Principle of dry EDM GUO RUI 200861856 Who invented Dry EDM ? NASA 1997 1985 Argon (Ar) Helium (He) Oxygen 1991 Air Mechanism
Higher meterial
removal rateo(MRR) and very little tool wear ratio(TWR) Higher machining speed Negligible damage generated
on the machined surface
and lower machined surface roughness Advantages This allows a simpler EDM machine which
does not need to take care of keeping the liquid inside.
Another advantage is, that in comparison to die sinking EDM usually performed in mineral oil, the process is environmental friendlier. Method Tool paths Thank you very much for your attention! To maintain machining accuracy.
To help flush the debris.
To lead to a more stable process. To enhance the material removal due to oxidation.
To remove the machining debris.
To cool of tool electrode.
To recover the insulation between work and tool electrode
Prevent the extreme heating of work and tool electrode. WRR=WRV/MT DEDM is 6 times larger than that of oil EDM milling Why? Oxidation Reaction EWR=EWV/WRV one-third lower Why? Dry EDM Vaporization of liquid working fluid Small physical damage of tool electrode caused by reactive force Cu: Copper
CC: Cemented Carbide
ss: Stainless Steel The material of workpiece
VS The material of tool electrode Copper takes away heat faster Current Discharge current
Duty factor
Air pressure
Spindle speed TWR Input parameters MRR Duty factor Air pressure Spindle speed Gap voltage Ra Independent Input parameters Arcing Removal of debris particles Surface damage Ra I d spark energy Crater volumes MRR Ra Crater volume Depth of crater Diameter of crater Both sensitive to the crater depth
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