Effect Of Electric Discharge Machining Of Die
Steel DIN 1.2714 And DIN 1.2343 On Surface
Characteristics And Performance Measures
Author(s)
M. A. Majid & A. M. Issa
Abstract
Electrical Discharge Machining (EDM) is progressively becoming a vital tool in
modern industry. Its performance, success and outcome depend upon the
selection of suitable electrical and non-electrical parameters. In the present
research EDM was applied to die steels DIN 1.2714 and powder mixed electrical
discharge machining (PMEDM) was applied to die steels DIN 1.2714 and DIN
1.2343. Regarding surface characteristics, surface roughness is found to increase
with current increase and white layer thickness (WLT) increased too. Similarly,
the effect of increasing pulse duration on surface roughness and white layer
thickness is found to be comparable. As for performance measures, steel DIN
1.2714 results have indicated reduced ratio of Metal Removal Rate (MRR) to
Electrode Wear Rate (EWR) from about 60 to 8.5 upon current increase. On the
other hand, the ratio (MRR/EWR) exhibited significant increase upon increasing
pulse duration, attributed mainly to reduced EWR. Results due to EDM using
graphite powder in dielectric kerosene, showed reduced electrode consumption.
Results to steel DIN 1.2714 indicated a noticeable increase of the ratio
(MRR/EWR) at high pulse duration upon increasing powder concentration from
0 to 5.5 (g/l). Statistical analyses showed a significant effect of pulse duration,
powder concentration and their interaction on the ratio (MRR/EWR).
Keywords: electric discharge machining, surface roughness, white layer
thickness, metal remove rate, electrode wear rate, current and pulse duration.
Keywords
electric discharge machining, surface roughness, white layer
thickness, metal remove rate, electrode wear rate, current and pulse duration.
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