Impact of incorporating Gr particles in dielectric fluid on machining performance of AA7050/SiC/Al2O3 hybrid composites
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This study attempted to machine AA7050 using the Electric Discharge Machining (EDM) technique fabricated throughstir casting, whereas aluminium oxide and silicon carbide particles were used as reinforcement. Experiments conducted byaltering, powder concentration, current, pulse duration, and reinforcing %, machining performance evaluated in terms ofmaterial removal rate (MRR), Tool Wear Rate (TWR), surface roughness (Ra), and Machined Surface Hardness (MSH). Because of the high density, the suspension of Gr particles inside the spark gap was obstructed, causing particle deposition overthe surface, which lowers the MRR in contrast to other particle suspensions. Lower heat was produced at higher Tons dueto plasma densification, resulting in a drop in TWR. The Ra value improved as a result of the electrode’s higher gap distancefrom the workpiece, which enables thorough flushing of machined waste. The incorporation of particles also evenly distributedthe energy over the machined area, eliminating the uneven machined surface. Black patches, resolidified solids, globules,craters, and pits were seen on the surface topography, when particles were introduced to the dielectric fluid, these defects wereeliminated because of complete flushing of machined debris.
Abstract
This study attempted to machine AA7050 using the Electric Discharge Machining (EDM) technique fabricated throughstir casting, whereas aluminium oxide and silicon carbide particles were used as reinforcement. Experiments conducted byaltering, powder concentration, current, pulse duration, and reinforcing %, machining performance evaluated in terms ofmaterial removal rate (MRR), Tool Wear Rate (TWR), surface roughness (Ra), and Machined Surface Hardness (MSH). Because of the high density, the suspension of Gr particles inside the spark gap was obstructed, causing particle deposition overthe surface, which lowers the MRR in contrast to other particle suspensions. Lower heat was produced at higher Tons dueto plasma densification, resulting in a drop in TWR. The Ra value improved as a result of the electrode’s higher gap distancefrom the workpiece, which enables thorough flushing of machined waste. The incorporation of particles also evenly distributedthe energy over the machined area, eliminating the uneven machined surface. Black patches, resolidified solids, globules,craters, and pits were seen on the surface topography, when particles were introduced to the dielectric fluid, these defects wereeliminated because of complete flushing of machined debris.
참고문헌 (46)
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