Optimization of machining parameters in dry EDM of EN31 steel

International Conference on Recent Advances in Materials, Mechanical and Civil Engineering

材料科学;机械制造;土木建筑工程

Brar, G.S.^1

Department of Mechanical Engineering, Guru Nanak Dev Engineering College, Gill Road, Ludhiana

Punjab

141006, India^1

关键词: Dielectric medium;    Discharge currents;    High pressure;    Machining parameters;    Oil-based liquids;    Output variables;    Surface roughness (Ra);    Tool wear rate;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/330/1/012071/pdf
DOI  :  10.1088/1757-899X/330/1/012071

来源: IOP

【 摘 要 】

Dry electric discharge machining (Dry EDM) is one of the novel EDM technology in which gases namely helium, argon, oxygen, nitrogen etc. are used as a dielectric medium at high pressure instead of oil based liquid dielectric. The present study investigates dry electric discharge machining (with rotary tool) of EN-31 steel to achieve lower tool wear rate (TWR) and better surface roughness (Ra) by performing a set of exploratory experiments with oxygen gas as dielectric. The effect of polarity, discharge current, gas flow pressure, pulse-on time, R.P.M. and gap voltage on the MRR, TWR and surface roughness (Ra) in dry EDM was studied with copper as rotary tool. The significant factors affecting MRR are discharge current and pulse on time. The significant factors affecting TWR are gas flow pressure, pulse on time and R.P.M. TWR was found close to zero in most of the experiments. The significant factors affecting Ra are pulse on time, gas flow pressure and R.P.M. It was found that polarity has nearly zero effect on all the three output variables.