30-10-2012, 03:20 PM
OPTIMIZATION OF MACHINING PARAMETER IN NICKEL BASE ALLOY
OPTIMIZATION OF MACHINING.ppt (Size: 3.54 MB / Downloads: 112)
Nickel based super alloy.doc (Size: 7.75 MB / Downloads: 135)
Nickel.docx (Size: 26.96 KB / Downloads: 42)
INTRODUCTION
Nickel based super alloy are finding wide application in the hot portions of jet turbines
such as blades, vanes, combustion chamber, etc.,
These materials posses high temperature, they place the cutting tools under tremendous
heat, pressure and abrasion leading to rapid flank wear, crate wear and tool notching at
the tool nose etc., and make them highly difficult to machine.
High toughness, ductility, High oxidation resistance and Good corosion resistance
The melting point of nickel is 1453°C, boiling point is 2732°C, specific gravity is 8.902.
Nickel is a silvery white metal that takes a high polish. Nickel is hard, ductile, malleable,
and somewhat ferromagnetic. It is a fair conductor of heat and electricity.
LITERATURE SURVEY
The integrity of the machined surfaces and tool life are the most important considerations
during machining are discussed in the machinability of nickel based alloy paper. Its
published on the year of 1999 by the E.O. Ezugwu, Z.M. Wang and A.R. Machado.
Heat treatment of UDMET 720Li: the effect of microstructure on properties by M.P.
Jackson and R.C. Reed in the year 1998.
The High Temperature low cycle fatigue behavior of UDMIT 720 has been investigated
at 700º C in vacuum and air environments under strain control tests. Its published in the
year of 2002 by M. Marchionni, G.A. Osinkolu and G. Onofrio.
The fatigue life of the alloy is practically independent of HT in both environments at
high strain ranges. The Strain induced γ precipitation in nickel base super alloy UDMIT
720 using a stress relaxation based technique by H. Monajati, F. Zarandi and M. Jahazi .
OBJECTIVE OF THE PROJECT WORK
Study the surface topography of the UDIMET alloy.
Study the surface roughness by varying various process parameters like speed,
feed and depth of cut.
Optimize the machining process to improve the surface roughness using ANN
method.
CUTTING TOOL MATERIALS
Carbon steels
High speed steels (HSS)
Cast Cobalt alloys
Carbides
Cermets
Ceramics
Silicon Nitride
Cubic Boron Nitride (CBN)
Diamond
SPEED
The speed v is defined as the magnitude of the velocity v, that is the derivative of the
position r with respect to time
Speed always refers to the spindle and the work piece.
When it is stated in revolutions per minute (rpm) it tells their rotating speed.
FEED
Feed always refers to the cutting tool.
It is the rate at which the tool advances along its cutting path.
The feed rate is directly related to the spindle speed and is expressed in mm
(of tool advance) per revolution (of the spindle), or mm/rev.
DEPTH OF CUT
It is the thickness of the layer being removed (in a single pass) from the work
piece or the distance from the uncut surface of the work to the cut surface,
expressed in mm.
It is important to note, though, that the diameter of the work piece is reduced
by two times the depth of cut because this layer is being removed from both
sides of the work
ARTIFICIAL NEURAL NETWORK(ANN)
An artificial neural network (ANN), usually called neural network (NN), is a
Mathematical model or computational model that is inspired by the structure and/or
functional aspects of biological neural network.
A neural network consists of an interconnected group of artificial neurons, and
it processes information using a connectionist approach to computation.
EXPERIMENTATION
Checking and preparing the Centre Lathe ready for performing the machining
operation.
Cutting UDIMET bars by power saw and performing initial turning operation in Lathe
to get desired dimension of the work pieces.
Performing straight turning operation on specimens in various cutting environments
involving various combinations of process control parameters like: spindle speed, feed
and depth of cut.
Using ANN method to analyze the result.
Measuring surface roughness and surface profile with the help of a portable stylus-type
profilometer, Talysurf (Taylor Hobson, Surtronic 3+, UK)
Measuring cutting tool flank wear in tool makers microscope.