Electrical Discharge Machining of Aluminum Matrix Composite Reinforced With Titanium Oxide Nano-Particles

Subject Areas :

Ali akbar lotfi ¹ , Saeed Daneshmand ²

1 - Assistant Professor, Department of Engineering, Yadegar -e- Imam Khomeini (RAH) Shahre Rey Branch, Islamic Azad University, Tehran, Iran
2 - Associate Professor, Department of Mechanical Engineering, Majlesi Branch, Islamic Azad University, Isfahan, Iran

Received: 2018-08-07 Accepted : 2019-08-06 Published : 2019-08-23

Keywords: Electrical discharge machining, Tool wear, metal matrix composites, Nano-particles of titanium dioxide, material removal rate,

Abstract :

.Nano-particles used in metal matrix composites show a various range of mechanical, chemical and physical features, causing significant improvements in mechanical strength, hardness and thermal characteristics. They can also change the capability of machining. Electrical discharge machining is considered as an integrate part of hard metal machining. In this paper, the parameters of electrical discharge machining for aluminum composite material improved by Nano-particles of titanium dioxide have been studied. The purpose of this study was to evaluate the impacts of electrical current and voltage and pulse on and off-time on the material removal rate, tool wear rate and surface roughness. Kerosene as a dielectric and copper electrode were used to carry out the experiment. In addition, Analysis of variance was utilized to authenticate the experimental results. The result shows that Nano-particles titanium dioxide has trivial effects on machining parameters due to being insulators. They also do not melt in the process of electrical discharge machining. Moreover, the electrical current and the pulse on time have the most influence on the material removal rate, tool wear rate and surface roughness. By increasing the electrical current and pulse on time, tool wear rate and surface roughness have grown, while by increasing the pulse off time tool wear rate has decreased. The average wear rate of the electrode in the aluminum alloy 2024 reinforced with 5% titanium oxide nanoparticles is 46.3%, equivalent to 0.346 gr, more than the weight loss of the aluminum 2024 specimen.

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