Seminar On Magneto abrasive flow machining (MAFM) Free Report Download

Magneto abrasive flow machining (MAFM) is a new
technique in machining. The orbital flow machining process has been recently
claimed to be another improvement over AFM, which performs three-dimensional machining
of complex components. These processes can be classified as hybrid machining
processes
(HMP)—a recent concept in the advancement of non-conventional machining.
The reasons for developing a hybrid machining process is to make use of
combined or mutually enhanced advantages and to avoid or reduce some of the adverse
effects the constituent processes produce when they are individually applied.
In almost all non-conventional machining processes such as electric discharge
machining, electrochemical machining, laser beam machining, etc., low material removal
rate is considered a general problem and attempts are continuing to develop
techniques to overcome it. The present paper reports the preliminary results of
an on-going research project being conducted with the aim of exploring
techniques for improving material removal (MR) in AFM. One such technique
studied uses a magnetic field around the work piece. Magnetic fields have been
successfully exploited in the past, such as machining force in magnetic
abrasive finishing (MAF), used for micro machining and finishing of components,
particularly circular tubes. The process under investigation is the combination
of AFM and MAF, and is given the name Magneto
Abrasive
Flow Machining
(MAFM).

PROCESS PARAMETERS
Following process parameters were hypothesised to influence
the performance of MAFM:
1. Flow rate (volume) of the medium,
2. Magnetic flux density,
3. Number of cycles,
4. Extrusion pressure,
5. Viscosity of the medium,
6. Grain size and concentration of the abrasive,
7. Work piece material,
8. Flow volume of the medium, and
9. Reduction ratio.
PRINCIPLE
The
volume of abrasive particles is carried by the abrasive fluid through the work piece.
Abrasives are impinged on the
work piece with a specified pressure which is provided by the piston and
cylinder arrangement or with the help of an intensifier pump. The pressure
energy of the fluid is converted into kinetic energy of the fluid in order to
get high velocity.
When a strong magnetic field is applied around the work
piece, the flowing abrasive particles (which must essentially be magnetic in
nature) experience a sideways pull that causes a deflection in their path of
movement to get them to impinge on
to the work surface with a small angle, thereby resulting in microchipping of
the surface. The magnetic field is also expected to affect the abrasive
distribution pattern at the machining surface of the work piece. The particles
that otherwise would have passed without striking the surface now change their path
and take an active part in the abrasion process, thus causing an enhancement in
material removal. It is to be mentioned here that although the mechanical pull
generated by the magnetic field is small, it is sufficient to deflect the abrasive
particles, which are already moving at considerable speed. Therefore it appears
that, by virtue of the application of the magnetic field, more abrasive
particles strike the surface. Simultaneously, some of them impinge on the
surface at small angles, resulting in an increased amount of cutting wear and
thereby giving rise to an overall enhancement of material removal rate.
Magneto abrasive flow machining (MAFM)
Principle Of Magneto abrasive flow machining (MAFM) 
ADVANTAGES
1. A very high volume of internal deburring is possible.
2. MAFM deburrs precision gears.
3. MAFM polishes internal and external features of various components.
4. MAFM removes recast layer from components.
5. Effective on all metallic materials.
6. Controllability, repeatability and cost effectiveness.
7. Less Time Consumption.
LIMITATIONS
1. Abrasive materials tend to get embedded,  if the work material is ductile.
2. Require closed environment.
3. Require start up hole.
4. Mostly Magnetic materials.
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