Magnetic Abrasive Finishing

Topics: Magnetic field, Magnet, Magnetism Pages: 23 (3355 words) Published: January 20, 2013
Effect of the Process Parameters on the Surface
Roughness during Magnetic Abrasive Finishing
Process on Ferromagnetic Stainless Steel workpieces
Rajwinder Singh Gill
Mechanical Engineering Department, Chandigarh Engineering College, Landran, Mohali, India Contact No: 9781992727 Email: -

Study of new and cost effective finishing processes has always been an area of keen interest to overcome the difficulties of existing finishing process. Magnetic Abrasive Finishing
(MAF) is a process in which a mixture of non-ferromagnetic
abrasives and ferromagnetic iron particles is used to do
finishing operation with the aid of magnetic force. The iron particles in the mixture are magnetically energized using a
magnetic field. The iron particles form a lightly rigid matrix in which the abrasives are trapped. This is called Flexible
Magnetic Abrasive Brush (FMAB), which when given relative
motion against a metal surface, polishes that surface.
The major studies concerning MAF have been done regarding
the behaviors of the process under the effect of various
parameters like working gap, mesh number of abrasive, speed
of relative motion on cylindrical and flat work-pieces taking one type of material, non-ferromagnetic or ferromagnetic
only. But limited comparative study by taking stainless steel with ferromagnetic behavior has been done to analyze the
surface roughness that is generated during the process.
This paper has aim of development of Magnetic Abrasive
Finishing Process & studying the effect of the process
parameters (percent composition of iron powder, mesh
number of abrasive and current) on the surface roughness
during MAF of ferromagnetic S.S. work-piece material for
flat work-pieces. The results of the experiments are
statistically analyzed using design expert v.7 software for the responses generated during the process.
In case of ferromagnetic work-piece, percent composition of
iron powder has more effect than the other parameters. With
increase in mesh size of abrasive, percent improvement in
surface roughness increases. With increase in current the
percent improvement in surface roughness value increases
much more than the other parameters, therefore effect of
applied current is seen to the most significant amongst all the parameters.

magnetic field in the machining zone. Magnetic abrasive finishing (MAF) has a magnetic field which assisted finishing process. The work piece is kept between the two poles of a magnet.. The
method was originally introduced in the Soviet Union, with
further fundamental research in various countries including Japan. Nowadays, the study of the magnetic field assisting finishing processes is being conducted at industrial levels around the world

A. Working Principle
The working gap between the work piece and the magnet is filled with magnetic Abrasive particles (MAP), composed of
ferromagnetic particles and abrasive powder. MAP is prepared by sintering of ferromagnetic particles and abrasive particles.The magnetic abrasive particles join each other along the lines of magnetic force and form a flexible magnetic abrasive brush

(FMAB) between the work piece and the magnetic pole .This
brush behaves like a multi-point cutting tool for finishing
operation. When the magnetic N-pole is rotating, the Magnetic Abrasive Finishing Brush (MAFB) also rotates like a flexible grinding wheel and finishing is done according to the forces acting on the abrasive particles. .

In external finishing of cylindrical surface, the cylindrical work piece rotates between the magnetic poles, with the MAP filled in both the gaps on either side (Fig 1). Whereas in internal finishing of cylindrical surface, the work piece rotates between the

magnetic poles and the MAP .as shown in Figure 2. The magnetic field generator can be either electromagnetic coils or permanent magnets. The relative motion between the induced abrasive
particles of the FMAB and work...
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