Surface Roughness and Surface Topography of Inconel 718 in Powder Mixed Dielectric Electrical Discharge Machining (PMEDM)

  • Said Ahmad Universiti Tun Hussein Onn Malaysia http://orcid.org/0000-0001-7002-2617
  • Mohd Amri Lajis Universiti Tun Hussein Onn Malaysia
  • Reazul Haq Abdul Haq Universiti Tun Hussein Onn Malaysia
  • Ahmad Mubarak Tajul Arifin Universiti Tun Hussein Onn Malaysia
  • Mohd Nasrull Abdol Rahman Universiti Tun Hussein Onn Malaysia
  • Ho Fu Haw Universiti Tun Hussein Onn Malaysia
  • Haslina Abdullah Universiti Tun Hussein Onn Malaysia
  • Mohd Fahrul hassan Universiti Tun Hussein Onn Malaysia
Keywords: Powder mixed EDM, Inconel 718, Surface roughness, Surface topography

Abstract

In high speed EDM, maximum material removal rate (MRR) is a desirable to increase productivity rate and reducing production cost to the need of industry. However, the surface finish of the machined surface also cannot be neglected since it related to product quality and safety factor especially when to cut difficult to machine material such Inconel 718, which is widely used in aerospace industry. Surface roughness as one of the surface integrity criteria was choose as a response in this research. High discharge current from 20A to 40A, longer pulse on-time (pulse duration) from 200µs to 400µs and the different concentration of the nano Alumina powder were selected as the main parameters, respectively. The effect of powder mixed dielectric in EDM performance in terms of surface roughness was evaluated. The dielectric circulating system known as High Performance Electrical Discharge Machine (HPEDM) was attached to the conventional EDM machine to run the experiments involving powder mixed dielectric. The experiment results shows that, the highest peak current deteriorated the surface roughness. The surface roughness, Ra was increased with the increasing of the peak current. The result also shows that an increasing of the pulse duration the surface roughness was slightly improved. It is observed that, the value of Ra was closely related to the surface topography characteristic of the machined surfaces and directly depends on the applied discharge energy. There is no improvement in surface roughness when powder additive was mixed in a dielectric fluid.

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Author Biographies

Said Ahmad, Universiti Tun Hussein Onn Malaysia
Precision Machining Research Center (PREMACH), Faculty of Mechanical and Manufacturing Engineering
Mohd Amri Lajis, Universiti Tun Hussein Onn Malaysia
Faculty of Mechanical and Manufacturing Engineering
Reazul Haq Abdul Haq, Universiti Tun Hussein Onn Malaysia
Faculty of Mechanical and Manufacturing Engineering
Ahmad Mubarak Tajul Arifin, Universiti Tun Hussein Onn Malaysia
Faculty of Mechanical and Manufacturing Engineering
Mohd Nasrull Abdol Rahman, Universiti Tun Hussein Onn Malaysia
Faculty of Mechanical and Manufacturing Engineering
Ho Fu Haw, Universiti Tun Hussein Onn Malaysia
Faculty of Mechanical and Manufacturing Engineering
Haslina Abdullah, Universiti Tun Hussein Onn Malaysia
Faculty of Mechanical and Manufacturing Engineering
Mohd Fahrul hassan, Universiti Tun Hussein Onn Malaysia
Faculty of Mechanical and Manufacturing Engineering
Published
19-11-2018
How to Cite
Ahmad, S., Lajis, M. A., Abdul Haq, R. H., Tajul Arifin, A. M., Abdol Rahman, M. N., Fu Haw, H., Abdullah, H., & hassan, M. F. (2018). Surface Roughness and Surface Topography of Inconel 718 in Powder Mixed Dielectric Electrical Discharge Machining (PMEDM). International Journal of Integrated Engineering, 10(5). Retrieved from https://publisher.uthm.edu.my/ojs/index.php/ijie/article/view/3110
Section
Special Issue 2018: Mechanical Engineering

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