Effect of Al2O3 – Graphite nano powder dielectric mixture on surface response in machining of St. steel 304L

One of the electrical discharge machining purposes today, mainly nanopowder mix electrical discharge machining, is to get high-quality surface integrity materials. The input process parameters must be adjusted as needed to get good results. The current work includes an experimental study of the effe...

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Bibliographic Details
Main Authors: Sachit, Qasim A., Tawfiq, Maan A.
Format: Conference Proceeding
Language:English
Subjects:
Aluminum oxide
Austenitic stainless steels
Dielectrics
EDM electrodes
Electric discharge machining
Electrodes
Factorial design
Graphite
Material removal rate (machining)
Mixing ratio
Process parameters
Surface roughness
Wear rate
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Summary:One of the electrical discharge machining purposes today, mainly nanopowder mix electrical discharge machining, is to get high-quality surface integrity materials. The input process parameters must be adjusted as needed to get good results. The current work includes an experimental study of the effect of discharge current, pulse on time (Pon), pulse off time (Poff), powder concentration, and mixing ratio of Al2O3 − graphite nanopowder on SR-surface roughness, EWR-electrode wear rate and MRR-material removal rate, during electrical discharge machining (EDM) of 304L stainless steel. A cylindrical copper electrode with a diameter of 16 mm and a length of 40 mm was employed as a tool electrode in this unconventional machining procedure. MINITAB 18 half factorial design of the experiment method was used by considering 5 factors and 5 levels. Total tests-24 tests (12 tests for conventional EDM and 12 tests for NPMEDM) were carried out with various combinations of input elements. The results showed that adding alumina-graphite nanoparticles to an EDM kerosene dielectric had a more significant influence on increasing the MRR and decreasing the EWR and SR. This work investigates the possibility of dielectric modification by adding Al2O3-graphite nanopowder to enhance performance during machining. The performance of this developed nanopowder-mixed electrical discharge machining (NPMEDM) method is compared with conventional EDM. The mean value of MRR rises from 0.1263 to 0.1383 g/min, EWR drops from 0.0066 to 0.0052 g/min, and SR increases from 5.131 to 4.939 µm.
ISSN:0094-243X
1551-7616
DOI:10.1063/5.0209524