Abstract
Electrical discharge machining (EDM) is a non-conventional method of machining hard materials with intricate shapes. Near-dry electric discharge machining (ND-EDM) is an advanced method of EDM which is eco-friendly and is more efficient in terms of material removal rate (MRR) than traditional EDM. In this research, an approach has been made to perform a new electrical discharge machining operation on EN-31 steel which utilizes metallic powder as an additive along with a gaseous dielectric (for example air) in ND-EDM. This advanced method of machining is known as powder mixed near-dry EDM. This study involves modeling for output process parameter—Material Removal Rate. The mathematical model was developed using the approach of Gaussian heat distribution. FEM modeling was done on ANSYS WORKBENCH 16.0 module. The experiments were performed and comparative study was done between the results obtained by modeling and experiments. The maximum experimental MRR was 7.68 mm3/min, and the error percentage between experimental, mathematical and FEM was under 30%. It was concluded that the modeling was done successfully and results obtained do comply with the methodology of the research.
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Abbreviations
- F c :
-
Heat distribution factor
- V b :
-
Discharge or break down voltage, V
- I :
-
Discharge current, A
- Q :
-
Rate of heat supplied at workpiece, W
- q′:
-
Heat supplied, J
- Q(t):
-
Rate of heat flux supplied, W/mm2
- A :
-
Area over which heat flux is acting, mm2
- MRRd :
-
Material removal per discharge, mm3
- MRR:
-
Material removal rate, mm3/min.
- γ cr :
-
Critical concentration ratio, Ncr/N∞
- N cr :
-
Particle concentration at breakdown, g/l
- N∞or Navg :
-
Average particle concentration, g/l
- R c :
-
Critical radius, mm
- t B :
-
Break down time, μs
- K Ø :
-
Constant
- η :
-
Viscosity of dielectric medium, Pas
- x :
-
Inter-electrode gap, mm
- s :
-
Size of individual powder particles, mm
- E :
-
Electric field at a location other than discharge region, V/mm
- E o :
-
Electric field at discharge region, V/mm
- P on :
-
Pulse-on time, μs
- P off :
-
Pulse-off time, μs
- V vt :
-
Total crater volume, mm3
- j i :
-
Volume of individual cylindrical disks, mm3
- W i :
-
Initial mass of the workpiece before machining, g
- W f :
-
Final mass of the workpiece after machining, g
- \(\rho\) :
-
Density of the workpiece, g/mm3
- T m :
-
Machining time for experiments, minutes
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Sundriyal, S., Yadav, J., Walia, R.S. et al. Thermophysical-Based Modeling of Material Removal in Powder Mixed Near-Dry Electric Discharge Machining. J. of Materi Eng and Perform 29, 6550–6569 (2020). https://doi.org/10.1007/s11665-020-05110-3
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DOI: https://doi.org/10.1007/s11665-020-05110-3