
350 Fundamentals of Machining Processes
eld (Figure 10.54). The magnetically stiffened slug of the MR polishing uid
is extruded back and forth or across the passage formed by the workpiece
and xture. Abrasion occurs only where the magnetic eld is applied, keep-
ing other areas unaffected (Figure 10.55).
MRAFF is found capable of supernishing harder materials such as sili-
con nitride using boron carbide, silicon carbide, and diamond abrasives. The
abrasive cutting edges are held by carbonyl iron particles (CIPs). The relative
size ratio of CIPs and abrasive particles plays an important role in the nish-
ing performance (Das, 2011).
The unique ...