Kumar H.,Panjab University |
Choudhary R.,MIMIT Malout |
Singh S.,Sant Longowal Institute of Engineering And Technology
Journal of Materials Engineering and Performance | Year: 2014
In this study, a special experimental setup of EDSG using EDM and surface grinding machine has been developed in the laboratory to investigate the effect of seven input parameters namely tool polarity, peak current, pulse on-time, pulse off-time, rotational speed, abrasive particle size, and abrasive particle concentration on material removal rate (MRR) as performance measure of the process. The novelty of the present research work is that successful efforts have been made to machine the 6061Al/Al2O3p 10% metal matrix composites (MMC) by composite tool itself. The copper-based composite tool electrodes were fabricated by powder metallurgy route with different sizes of abrasives of silicon carbide, while 6061Al/Al2O3p 10% MMC were fabricated through stir-casting process. The research outcome will identify the important parameters and their effect on MRR of 6061Al/Al 2O3p 10% composite in EDSG. The experimental results reveal that tool polarity, peak current, and rotational speed are the most influential parameters that affect MRR in EDSG process. The micro-structural and morphological analysis of machined surfaces has also been carried out to analyze the surface topography. It has been concluded that the abrasive particles substantially improves the MRR after removing the resolidified layer from the machined surface. © 2014 ASM International.
Choudhary R.,MIMIT Malout |
Gupta V.K.,MIMIT Malout |
Batra Y.,MIMIT Malout |
Singh A.,MIMIT Malout
Materials Today: Proceedings | Year: 2015
The ongoing developments in the field of materials science have developed many high strength and temperature resistant (HSTR) metal alloys that are difficult to machine by the conventional machining. Electrical discharge machining is one of the commonly used non-conventional machining processes used to machine hardened tool steels and conductive advanced materials. In this study effect of machining parameters like tool polarity, current, pulse on-time and voltage has been investigated on surface roughness of Nimonic 75 alloy using Taguchi's experimental design technique. From the S/N ratio plots It was observed that tool polarity, pulse on-time and current are most influential parameter that affect surface roughness in EDM. The surface machined by the negative tool polarity was found to be smoother than the positive tool polarity. The deposition rate of the negative polarity tool electrode was comparatively more than the positive polarity tool electrode. The maximum deposition of carbon was observed on the surface machined with positive polarity tool electrode. © 2015 Elsevier Ltd.