Investigating factors affecting electrode wear rate in electrical discharge machining of AZ91 magnesium alloy metal matrix composite reinforced with silicon carbide microparticles

Authors

1 MSc, Department of Mechanical Engineering, arak university of technology, arak, Iran

2 Assist. Prof., Department of Mechanical Engineering, arak university of technology, arak, Iran

3 Ph.D. Student, Department of Mechanical Engineering, arak university, arak, Iran

4 Assoc. Prof., Department of Mechanical Engineering, arak university of technology, arak, Iran

10.22044/jsfm.2023.12837.3711

Abstract

Metal matrix composites have attracted a lot of attention for application in the aerospace, defense, and automotive industries. Machining these materials with traditional machining methods is very difficult due to the presence of abrasive particles. Electrical Discharge Machining (EDM) is one of the most widely used advanced machining methods and seems to be a good method for machining metal matrix composites. Tool wear occurs during the process and cannot be reduced to zero, but it can be reduced as much as possible. In this research, the effect of discharge peak current, pulse on time, and pulse off time on the workpiece made of AZ91 magnesium alloy, reinforced with 5% of powdered silicon carbide particles has been investigated. The effect of these parameters on the wear rate of copper electrode is studied. The tests of this process have been modeled using the response surface methodology. 17 experiments have been done to reach the results. Discharge peak current, pulse on time, the interaction effect of discharge peak current and pulse on time, and the interaction effect of pulse off time and discharge peak current are effective factors on electrode wear rate. The lowest electrode wear rate is on the 300 microseconds pulse on time, 11.69 amp discharge peak current, and pulse off time of 20 microseconds.

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References

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