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Effects of Al2O3 powder on electro discharge machining process of nickel-titanium shape memory alloy

SAEED DANESHMAND1,* , ALI AKBAR LOTFI NEYESTANAK2, VAHID MONFARED3

Affiliation

  1. Department of Mechanical Engineering, Majlesi Branch, Islamic Azad University, Isfahan, Iran
  2. Department of Engineering, Yadegar -e- Imam Khomeini (RAH) Branch, Islamic Azad University, Tehran, Iran
  3. Department of Mechanical Engineering, Zanjan Branch, Islamic Azad University, Zanjan, Iran

Abstract

Shape memory alloys are kind of alloys with different properties like high fatigue strength, oxidation, creep, vibration and high functional temperature. These alloys are widely applied in aerospace, automobile, medicine and dentistry industries. Electro Discharge Machining is an innovative method in machining of shape memory alloys. Surface roughness and low material removal rate are considered as main problems in this technique. In the present study, the effect of Al2O3 powder on Electro Discharge Machining parameters including surface roughness, tool wear rate, removal rate and surface integrity was studied. The results show that utilizing Al2O3 in machining of NiTi shape memory and increase in material removal rate rises tool erosion and surface roughness. On the other hand, increase in pulse-on time and voltage causes decrease in tool erosion and obtaining better material removal rate. Surface integrity results indicate that using Al2O3 powder creates shallower holes on the workpiece and reduces surface defects and cracks..

Keywords

Electro Discharge Machining- Al2O3 powder-material removal rate- tool wear rate- surface roughness- shape memory alloy.

Citation

SAEED DANESHMAND, ALI AKBAR LOTFI NEYESTANAK, VAHID MONFARED, Effects of Al2O3 powder on electro discharge machining process of nickel-titanium shape memory alloy, Optoelectronics and Advanced Materials - Rapid Communications, 8, 11-12, November-December 2014, pp.1119-1124 (2014).

Submitted at: Sept. 3, 2014

Accepted at: Nov. 13, 2014