Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : REW


Study the Effect of Electrical Current on Average Surface Roughness of Borosilicate Glass at EDM Machining and Comparison Using Matlab Program

Shukry H. Aghdeab; Ahmed A. Abulwahhab

Engineering and Technology Journal, 2011, Volume 29, Issue 6, Pages 1157-1165

Machining of electrically non-conducting materials like glass is still a major
problem. The principle of electric arc was used to generate high electrical
discharge (spark) at high currents to machine non-conducting materials at any
hardness.
EDM system was build for machining of non-conducting cutting materials
such as glass including the use of powder (graphite) mixed for dielectric solution
(tap water) by supplied DC current values (200, 250, 300, 350 and 400A). Voltage
of (70V) was used to cut 3mm thickness of borosilicate glass (BSG) to obtain the
average surface roughness (Ra) of about (0.003-0.012μm).
Matlab program has been used to investigate the process control for EDM that
could the Ra experimental and theoretical with accuracies of 94.236, 94.034,
96.628 and 92.875% respectively.
From the reading of the magnitude of the roughness it was found that differences
between the theoretical and experimental values for 3mm thickness of BSG was
never exceed (8%).

Effect of Current on Average Surface Roughness of Borosilicate Glass at EDM Machining and Comparison with Numerical Programs

Wathik I. Mahdi; Maan A. Tawfiq; Shukry H. Aghdeab

Engineering and Technology Journal, 2009, Volume 27, Issue 6, Pages 1026-1038

Machining of electrically non-conducting materials like glass is still a major problem. The principle of electric arc was used to generate high electrical discharge (spark) at high currents to machine non-conducting materials at any hardness, which is a new approach.
EDM system was build for machining of non-conducting cutting materials such as glass with new technology including the use of powder (graphite) mixed for dielectric solution (tap water) by supplied AC current values (200, 250, 300, 350 and 400A). Voltage of (70V) was used to cut 3mm thickness of borosilicate glass (BSG) to obtain the average surface roughness (Ra) of about (0.003-0.012μm) but the Ra before the machining was (0.005-0.006μm).
Numerical program called "Simulent" has been used to investigate the process control for EDM by using GN, BPN, PN and VQN that could predict the Ra with accuracies of 94.236, 94.034, 96.628 and 92.875% respectively from training data sets.
The differences on the Ra at different network models for 3mm thickness of BSG never exceed (8%) from testing data sets while the comparison of numerical results with experimental results of Ra among the measured values and prediction various network models, shows a differences between (1-8%).
The best predication accuracy is by the use of PN than other network models.