New M.Tech. Thesis Submitted from Production

CHARACTERIZATION OF MAGNETIC ABRASIVES PREPARED BY SINTERING PROCESS by Mukesh Kumar 

Abstract

Magnetic abrasives play essential role in Magnetic abrasive Finishing (MAF) process. At present magnetic abrasives are prepared by various methods. Most of the studies have been reported where simple mixing of ferromagnetic and abrasive particles is done. The improved method suggested was sintering. But in the existing studied the detail of sintering has not been mentioned. In the present work the parametric studies have been undertaken to find the suitable combination of input process parameters of sintering so that good quality magnetic abrasive can be produced. Three major parameters sintering time (min), compacting pressure (N/mm2), Abrasive concentration (%age) has been chosen. By adopting DOE technique Response Surface Methodology (RSM) a set of experiments have been conducted. The experimental data was analyzed by software and effect of input parameters on two output parameters PISF (Percentage Improvement in Surface Finish), MS (Magnetic Strength) has been studied. Empirical relation between input and output parameters has also been suggested. For brass specimen the results obtained 68.8 % PISF at sintering time 24 min, compacting pressure 8.3 N/mm2 and abrasive concentration 18 % aluminum oxide with 82 % iron powder. Similarly 99.99 % magnetic strength obtained at sintering time 51 min, compacting pressure 8.3 N/mm2 and 18 % abrasive concentration with 82 % iron powder.