Experimental investigation of ohns surface property and process parameter on cnc milling machine

 This project aims towards the optimization of CNC milling operation is
used over an OHNS material. The Milling machine was chosen because of
its availability and its ability to perform various tasks without much change
in its structure.
 In this experimental investigation was observed the machining performance
with various cutting speed, feed and depth of cut using side and face
milling cutter.
 Mainly surface roughness where investigated employing Taguchi design of
experiments and analysis of variance (ANOVA)

 The objective of today's manufacturing industries is to produce low cost,
high quality products in short time.
 The Taguchi’s orthogonal array is used to formulate the experimental
layout, to analysis the effect of each parameter on the machining
characteristics and to predict the optimal choice for each Milling
parameters such as Speed, Feed, Depth of cut.
 The Analysis of Variance (ANOVA) and Signal-to-Noise ratio are used to
study the performance characteristics in Milling operation

Methodology
 State the problem.
 State the objectives of experiments.
 Select the factors that may influence the selected quality
characteristics.
 Select the quality characteristics of measurement system.
 Identify quality and noise factors.
 Select levels for the factors.
 Select appropriate orthogonal arrays and locate interactions.
 Conduct the tests described by trails in orthogonal array.
 Analyze and interpret results of the experiment trails.
 Conduct confirmation experiment.

 P. Sudhakar Rao and P.K. Jain presented a paper on “Precision Finishing of
External Cylindrical Surfaces of EN8 Steel by Electro Chemical Honing (ECH)
Process using OFAT Technique” discussed about the the design and fabrication of an
indigenously developed tooling setup for ECH of an external cylindrical
components. Titanium alloys (TI 6AL 4 V) and EN8 Steel are used as the work
piece material for carrying out the experimentation to describe the material removal
and surface roughness characters.

 Sanjit mosh at investigate the process parameters need to be optimized during CNC
machining is an essential and costly process for small and medium type
manufacturing industries. The common tendency of process is to reduce the
machining cost and time and increasing the accuracy of the product. According to
Taguchi, quality of a manufactured product has total loss generated by that product
to society from the time has shipped. Taguchi developed a method based on
orthogonal array experiments, which reduced “variance” for the experiment with
“optimum settings” of control parameters. Thus the combination of Design of
 Kohli and Dixit proposed a neural-network-based methodology with the
acceleration of the radial vibration of the tool holder as feedback. For the surface
roughness prediction in turning process the back-propagation algorithm was used
for training the network model.

Milling Machine:
A milling machine is a machine tool used for the complex shaping of metal and other solid materials. Its
basic form is that of a rotating cutter or end mill which rotates about the spindle axis (similar to a drill), and a
movable table to which the work piece is affixed. That is to say, the cutting tool generally remains stationary (except
for its rotation) while the work piece moves to accomplish the cutting action. Milling machines may be operated
manually or under computer numerical control. Milling machines can perform a vast number of complex operations,
such as slot cutting, planning, drilling, rebating, routing, etc. Cutting fluid is often pumped to the cutting site to cool
and lubricate the cut, and to sluice away the resulting swarf.
CNC vertical milling machine

TYPES OF MILLING MACHINES:
A miniature hobbyist mill plainly showing the basic parts of a mill.
1. Hand milling machine.
2. Plain milling machine.
3. Universal milling machine.
4. omniversal milling machine.

CUTTING TOOL MATERIALS:
The classes of cutting tool materials currently in use for machining operation
are;
 high speed tool steel,
 cobalt-base alloys,
 cemented carbides,
 ceramic,
 polycrystalline cubic boron nitride
 polycrystalline diamond.

FACTORS AFFECTING IN MILLING OPERATION:
The three primary factors in any basic turning operation are speed, feed,
and depth of cut.
SPEED
FEED
DEPTH OF CUT

SPEED=
Speed always refers to the spindle and the work piece. When it is stated in revolutions per
minute (rpm) it tells their rotating speed. But the important feature for a particular turning
operation is the surface speed, or the speed at which the work piece material is moving
past the cutting tool.
FEED =
Feed always refers to the cutting tool, and it is the rate at which the tool advances along its cutting path. On most power-fed lathes, the feed rate is directly related to the spindle speed anFeed always refers to the cutting tool, and it is the rate at which the tool advances along its cutting path. On most power-fed lathes, the feed rate is directly related to the spindle speed an
Feed always refers to the cutting tool, and it is the rate at which the tool advances along its
cutting path. On most power-fed lathes, 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;
Depth of cut is practically self-explanatory. 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.

Experimental investigation of ohns surface property and process parameter on cnc milling machine

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Experimental investigation of ohns surface property and process parameter on cnc milling machine