Ae4103177185

Mihir T. Patel et al Int. Journal of Engineering Research and Applications
ISSN : 2248-9622, Vol. 4, Issue 1( Version 3), January 2014, pp.177-185

RESEARCH ARTICLE

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OPEN ACCESS

Experimental Investigation of Effect of Process Parameters on
Mrr and Surface Roughness In Turning Operation on
Conventional Lathe Machine For Aluminum 6082 Grade
Material Using Taguchi Method
Mihir T. Patel*, Vivek A. Deshpande**
*(Department of Mechanical Engineering, B & B Institute of Technology, Gujarat, India)
** (Department of Mechanical Engineering, G. H. Patel college of Engineering & Technology, Gujarat, India)

ABSTRACT
In this study, the effect of the machining parameters like spindle speed, feed, depth of cut and nose radius on
material removal rate and surface roughness are investigated, also optimum process parameters are studied. An
L8 orthogonal array (mixed level design), analysis of variance (ANOVA) and the signal –to-noise (S/N) ratio are
used in this study. Mixed levels of machining parameters are used and experiments are done on conventional
lathe machine. Aluminum Alloy - Al 6082 grade material is used in high stress applications, Trusses, Bridges,
Cranes, Transport applications, Ore skips, Beer barrels, Milk churns etc. The most significant parameters for
material removal rate are speed, depth of cut and least significant factor for MRR is nose radius For surface
roughness speed, nose radius are the most significant parameters and least significant factor for surface
roughness is depth of cut. The mathematical model obtained as a result of regression analysis can be reliable to
predict MRR and surface roughness Ra.
Keywords - Analysis of Variance, Mixed Level Array, Optimization, Regression Analysis, Taguchi Method.

I.

INTRODUCTION

In a global competitive environment every
industries are trying to decrease the cutting cost and
increased the quality of machined parts/components.
So, it required to focus on material removal rate and
surface roughness. The machining time reduces lead
to reduce overall costs which depend on volume of
material to be removed and machining parameters
like speed, feed and depth of cut.
The quality of surface roughness is also
important properties of machined parts, the good
quality machined parts improved fatigue strength,
corrosion resistance, creep life. The surface
roughness also on some functional attributes like
surface friction, wearing, light reflection, ability of
holding and distributing a lubricant, load bearing
capacity, etc. Increasing the productivity and the
quality of the machined parts are the main
challenges of the based industry [1].
Aluminum alloys are classified under two
classes: cast alloys and wrought alloys. Moreover,
they can be classified according to the specification
of the alloying elements involved, such as strainhardening alloys and heat-treatable alloys. Most
wrought aluminum alloys have excellent
machinability. While cast alloys containing copper,
magnesium or zinc as the main alloying elements
can cause some machining difficulties, the use of
small tool rake angles can improve machinability
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[2]. Aluminum is widely used non-ferrous metal.
Aluminum is almost always alloyed, which
markedly improves its mechanical properties,
especially when tempered. The main alloying agents
are copper, zinc, magnesium, manganese, and
silicon and the levels of these other metals are in the
range of a few percent by weight [3].
The work material used for present study is
Aluminum alloy 6082 is a medium strength alloy
with excellent corrosion resistance and it has the
highest strength of the 6000 series alloys. Alloy
6082 is known as a structural alloy. As a relatively
new alloy, the higher strength of Aluminum alloy
6082 has seen it replace 6061 in many applications.
Many types of tool materials, ranging from
high carbon steel to diamonds, are used as cutting
tools in today‟s metal working industry. It is
important to be aware that differences do exist
among tool materials, what these differences are,
and the correct application for each type of material.
In some particular applications, a premium or higher
priced material will be justified. This does not mean
that the most expensive tool is always the best tool
[2]. The imports of tool damage leads to economic
losses like work piece spoiling or poor surface
quality. Selection of best process parameters using
various optimization techniques will help to solve
the problem of improper selection of process
parameters. In order to select optimal cutting
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parameters, manufacturing to obtain optimal cutting
parameters, manufacturing industries have depended
on the use of handbook based information which
leads to decrease in productivity. This causes high
manufacturing cost and low product quality [4]
Many researcher have been carried
experimental investigation to study the effect of
cutting parameters, tool geometry using the
Aluminum alloys. They have taken speed, feed and
depth of cut as input parameters and surface
roughness as responding parameter. They proved
that feed, speed is the most significant factor. [2],
[5]-[10]. Only few researcher have studied the
interaction effect of nose radius. For surface
roughness they found that nose radius is most
significant factor [5].
MRR and surface roughness are the
important parameters and it requires to optimize.
The optimization of lathe turning process is often
achieved by trial-and-error method based. But this
does not give guarantee of quality as well as
machining economics [11]. The traditional
experimental design methods are very complicated
and difficult to use and required a large number of
experiments when process parameters are increase
[12]. A general optimization plan is required to
avoid cumbersome trial runs on machine and
wastages. Taguchi method is widely adopted for the
improvement of quality and machining economics.
Taguchi parameter design uses the orthogonal array
concept, used to estimate main effects using few
experimental runs [13].

II.
MRR AND SURFACE
ROUGHNESS MEASUREMENT
The material removal rate has been
calculated from the difference of weight of work
before and after machining by using following
formula.

MRR=

Wi -Wf
ρa t

Where,
Wi = weight of work before machining
Wf = weight of work after machining
t = machining time in minute
ρa = density of Al 6082 (2.7 g/mm3)
There are several ways to describe surface
roughness such as average roughness (Ra), Root
mean square (Rs), Maximum peak to valley
roughness (Rt) and Ten point height method (Rz).
One of the most often used average roughness
which is often represented as Ra symbol. The
average value (without considering the positive or
negative sign) of the ordinates (y1, y2,…, yn) drawn
on the mean line of the surface profile called as
CLA number or Ra value.
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Ra 

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y1  y 2  y3  y n
y

L
L

The above method finding CLA number is
quite tedious. The easy method is as below
In this method the area (A1,A2,…, An) generated
from mean line and surface profile measured with
help of planimeter and then Ra value is found as
below

Ra 

A1  A 2  A 3  A n

L

A
L

Where, L = sampling length
There are many method is used to measure
surface roughness , such as fingertip, microscopes,
stylus type instruments, profile tracing instruments
etc. The portable surface roughness tester Surftest
SJ-301 used in present experimental work.

Fig. 1: Mitutoyo Surftest SJ-301

III.

TAGUCHI METHOD

The Taguchi method involves reducing the
variation in a process through robust design of
experiments. The objective of method is to produce
high quality of product with low cost to
manufacturer. Taguchi developed method for
designing experiments to investigate how different
parameters affect the mean and variance of process
performance characteristics. The selection of
orthogonal array (OA) is the most important steps in
Taguchi technique. An OA is small set of
possibilities which helps to determine with least no.
of experiments run. For example consider a system
which has 4 parameters and each of them has 3
levels. To test all the possible combinations of these
parameters, we will need a set of 34 = 81 test cases.
But instead of testing the system for each
combination of parameters, we can use an
orthogonal array to maximize the test coverage with
the number of test equal to only 9. To obtain process
parameter setting, Taguchi proposed statistical
measure of performance called signal to noise ratio
is also known as S/N Ratio. This ratio considers
both mean as well as variability. In addition to S/N
ratio, ANOVA is used to indicate the influence of
process parameters on performance measures.
Taguchi proposed three performance characteristics
in analysis of the Signal to noise ratio (S/N ratio)
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that is the smaller the better, the higher the better
and the nominal the better (Ross, 1996). In the
present work the first selection the higher the better
characteristic for material removal rate and the
lower the better characteristics for the surface
roughness.
The higher the better S/N ratio for MRR,
mean of sum squares of reciprocal 
S/N ratio = -log10 

of measured data

The lower the better S/N ratio for surface roughness,
reciprocal of mean of sum squares 
S/N ratio = -log10 

of reciprocal of measured data


IV.

DESIGN OF EXPERIMENT

For the experimental design Taguchi
method was employed to reach more comprehensive
a result with lesser experiments. The objective of
Design of experiment is to determine the variables
in a process that are the critical parameters and their
target values and so on the basis of selected
parameters, experimental design is carried out.
Taguchi method is a powerful tool for the design of
high quality systems which provides simple,
efficient and systematic approach to optimize
designs for performance, quality and cost. Taguchi
method is efficient method for designing process
that operates consistently and optimally over a
variety of conditions. The Taguchi experimental
design is done for L8 Orthogonal array (OA) for
mixed level design for four parameters which are
spindle speed, feed, depth of cut and nose radius.
Minitab16 software was used for analyze the data.
Table 1: Process Parameters
Process
Level Level Level Level
Factor
Parameters
1
2
3
4
Spindle
A
speed
110
400
575
1235
(rpm)
Feed
B
0.142 0.21
(mm/rev)
Depth of
C
0.495 0.99
cut (mm)
Nose
D
Radius
1
1.5
(mm)
The experimental layout was developed
based on Taguchi‟s for mixed level design for four
parameters L8 OA experimental technique. An L8
OA experimental setup was selected to satisfy the
minimum number of experimental conditions for the
factor and levels presented in table 2.

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Table 2: Orthogonal Array
Spindle
speed
(A)

Feed
(B)

DOC
(C)

Nose
Radius
(D)

1

1

1

1

1

2

2

2

2

1

1

2

2

2

2

1

3

1

2

1

3

2

1

2

4

1

2

2

4

2

1

1

V.

EXPERIMENTAL DETAILS

The process parameters that are affecting
the characteristics of turned parts are
 Cutting Tool parameters e.g. tool geometry
and tool material
 Work related parameters such as hardness,
ductility, metallographic etc.
 Cutting parameters – Spindle speed, feed,
and depth of cut.
 Environmental parameters- Dry cutting,
wet cutting.
The following process parameters are
(controllable) selected for present work : Spindle
speed (A), Feed (B), Depth of Cut (C), Nose radius
(D).
The work material used was Al 6082 corresponds to
the
following
standard
designations
and
specifications:
 AA6082
 HE30
 DIN 3.2315
 EN AW-6082
 ISO: Al Si1MgMn
 A96082
It is one of the largest used in different
applications such as high stress applications,
Trusses, Bridges, Cranes, Transport applications,
Ore skips, Beer barrels, Milk churns etc. Al 6082
available in different form like square bar, square
box section, Tee section, equal angle, unequal angle,
flat bar, tube, sheet etc.

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Table 3: The Chemical composition of Aluminum
alloy 6082

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Element

% Present

C

0.7 – 0.8

Si

0.2 – 0.4

Mn

0.2 – 0.4

Cr

3.75 – 4.5

Element

% Present

Si

0.7-1.3

Fe

0.5

Mo

0.7 – 1.0

Cu

0.1

V

0.8 – 1.2

Mn

0.4-1.0

W

17.25 – 18.75

Co

4.25 – 5.75

Mg

0.6-1.2

Zn

0.2

Table 5: Experimental Details
Work piece Material

Aluminum alloy 6082

Length of work piece

40 mm

Ti

0.1

Cr

0.25

Diameter of work piece

20 mm

Al

Remaining

Tool used

AISI T-4

Lathe used

Nagmati All Geared
Drive Lathe Machine

Environment

Dry

The Tool material used HSS grade (AISI
T-4). The characteristic properties HSS Grades are
working hardness, high wear resistance, high red
hardness and excellent toughness.
Table 4: The Chemical composition of AISI T-4

VI.

RESULTS AND DISCUSSION

Table 6: Experimental Result and Corresponding S/N Ratio
Nose
Feed (B)
DOC (C)
MRR
S/N for
Rad.
mm/rev
mm
mm3/min
MRR
(D) mm
0.142
0.495
1
1149.43
61.14

1

Speed
(A)
rpm
110

2

110

0.21

0.99

1.5

3647.77

71.30

9.72

-19.0904

3

400

0.142

0.495

1.5

1904.76

65.66

4.01

-11.3999

4

400

0.21

0.99

1

6172.84

75.75

9.58

-20.2903

5

575

0.142

0.99

1

4444.44

73.02

7.44

-16.7685

6

575

0.21

0.495

1.5

3645.98

71.18

5.11

-14.8314

7

1235

0.142

0.99

1.5

8455.94

78.49

2.41

-8.3033

8

1235

0.21

0.495

1

6703.54

76.59

7.08

-16.3377

Sr.
No.

Table 7: ANOVA table for MRR
SS
MS

Variable factors

DF

Speed (A)

3

28638513

Feed (B)

1

Depth of Cut (C)

Ra

S/N for
Ra

9.45

-20.1716

F

p

Contribution (%)

9546171

10.29

0.224

67.04

2221354

2221354

2.40

0.365

5.12

1

10851511

10851511

11.70

0.181

25.4

Nose Radius (D)

1

83190

83190

0.09

0.815

0.002

Error

1

927298

927298

Total

7

42721866

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Table 8: ANOVA table for Ra
Source

DF

SS

MS

F

P

%
Contribution

Speed (A)

3

24.4898

8.1633

22.6

0.153

45.64

Feed (B)

1

8.3641

8.3641

23.15

0.130

15.59

DOC (C)

1

1.5313

1.5313

4.24

0.288

02.86

Nose Radius (D)

1

18.9113

18.9113

52.35

0.087

35.24

Error

1

0.3612

0.3612

Total

7

53.6576

MINITAB 16 statistical software has been
used for the analysis of the experimental data and
provides the calculated results of signal-to-noise
ratio. The average value of Signal to noise (S/N)
ratios has been calculated to find out the effects of
different parameters as well as their levels. The
ANOVA (Analysis Of Variance) technique is help
to determine which parameter is most significant.
Where,
DF – Degree of freedom, SS – Sum of
Square
MS – Mean of Square, F – Statistical parameter,
P- Percentage

The main effect plot for MRR is shown in
figure 3. These show the variation of individual
response with speed, feed, depth of cut (DOC), and
nose radius parameters separately. The mean effects
plots are used to determine the optimal conditions
for MRR. According to main effects plots the
optimal conditions for material removal rate are
Cutting speed at level 4(1235 rpm)
Feed at level 2 (0.21 mm/rev.)
DOC at level 2 (0.99 mm)
Nose radius at level 1 (1 mm)
Interaction Plot for MRR
Data Means

1

Dotplot of MRR

2

1

2

1

2
9000

Speed
(A)

6000

1
2
3
4

Speed (A)

Speed (A )

Feed (B)

1

1

3000

DOC (C)
1
2
1

2

Nose
Radius
(D)
2
1

2
2

1
2
1

3

1
2
1

9000

2
1

2

9000

2

3000

1
2

2000

3000

4000

5000
MRR

6000

7000

8000

Nose Radius (D)

Fig. 4: Interaction plot for MRR

Fig. 2: Dot plot for MRR

Residual Plots for MRR

From figure 2. The highest MRR obtained
at A4B1C2D2 and lowest MRR obtained at A1B1C1D1.

Versus Fits

99

1000

Feed (B)

Residual

Percent

Data Means

Speed (A)

Normal Probability Plot
90

Main Effects Plot for Means of MRR

50
10

7000

1

6000
5000

-2000

-1000

4000

0
Residual

1000

0
-1000

2000

0

2000

Histogram

3000
4

1

DOC (C)

Nose Radius (D)

7000
6000

2
1
0

4000
3000
2

1

8000

1000

2

0

-1000

5000

1

6000

2
Residual

3

4000
Fitted Value

Versus Order

3

2

Frequency

Mean of Means

1
2

DOC (C)

1000

1

DOC
(C)

6000

1
2
1
2

1

1
2

3000

2
4

Feed
(B)

6000
Feed (B)

-1500 -1000

-500
0
Residual

500

1000

1

2

3
4
5
6
Observation Order

7

Fig. 5: Residual plot for MRR

Fig. 3: Main effects plot for means of MRR
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8

From figure 5 the residual spread along
straight line that suggest that the residual are
distributed normally and it is clear that no obvious
pattern and unusual structure. This implies that the
model proposed is adequate.

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The main effect plot for Ra is shown in figure 8.
According to main effects plots the optimal
conditions for Ra are
Cutting speed at level 4(1235 rpm)
Feed at level 1 (0.142 mm/rev.)
DOC at level 1 (0.495 mm)
Nose radius at level 2 (1.5 mm)
Interaction Plot for Ra
Data Means

1

2

1

2

1

2
Speed
(A)

9

1
2
3
4

6

Speed (A)

3
9

Fig. 6: Significance of machine parameter for MRR

Feed (B)

Feed
(B)

6

1
2

3
9

From the ANOVA table 7, the most
significant factor for the MRR is Speed (A) and its
contribution is 67.04% . After that second
significant factor for MRR is DOC (C) and its
contributions is about 25.4%. Other factors are
having less significant effects since „p‟ value are
more than 0.05 for the cofidence level 95%.

DOC
(C)

6

DOC (C)

1
2

3

Nose Radius (D)

Fig. 9: Interaction plot for Ra

Dotplot of Ra

Residual Plots for Ra
Normal Probability Plot

Versus Fits

99
DOC (C)

1

1

1
2
1

2

Nose
Radius
(D)
2
1

2
2

1
2
1

3

1
2
1

0.5

90

2
1

Residual

Feed (B)

Percent

Speed (A)

50
10

-1.0

1

-1.0

2
1
2
1
2

2

1
2

-0.5

0.0
0.5
Residual

2

4

Histogram

3

4

5

6
Ra

7

8

9

10

Main Effects Plot for Means for Ra
Data Means

Speed (A)

Feed (B)

9
8

10

0.5

1.5
1.0
0.5

0.0
-0.5
-1.0

0.0

From figure 7. The optimal Ra obtained at
A4B1C2D2 and lowest MRR obtained at A1B2C2D2.

6
8
Fitted Value

Versus Order

2.0

Fig. 7: Dot plot for Ra

-0.8

-0.4
0.0
Residual

0.4

1

2

3
4
5
6
Observation Order

7

8

F

ig. 10: Residual plot for Ra
From figure 10 the residual spread for Ra
lie along straight line that suggest that the residual
are distributed normally and it is clear that no
obvious pattern and unusual structure that suggest
the model proposed is adequate.

7

Probability Plot of Ra
Normal - 95% CI

6

99

Mean
StDev
N
AD
P-Value

5
1

2

3

4

1

DOC (C)

95

2

90

Nose Radius (D)

6.85
2.769
8
0.344
0.386

80

9

Percent

Mean of Means

1.0

Residual

1

Frequency

2
4

0.0
-0.5

8
7

70
60
50
40
30
20

6

10

5

5

1

2

1

2

Fig. 8: Main effects plot for means of Ra

1

0

5

10

15

20

Ra

Fig. 11: Probability plot for Ra
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Figure 11 shows that the all value are
within the confidence interval of 95%. Two lines
from the center line indicates the upper and lower
limit of confidence interval. No, value out of the
confidence interval. This tendency gives the better
result for future predictions

Fig. 12: Significance of machine parameter for Ra
From the ANOVA table 8, the most
significant factor for the Ra is Speed (A) and its
contribution is 45.64%.
After that second
significant factor for Ra is Nose radius (D) and its
contributions is about 35.24%. Other factors are
having less significant effects since „p‟ value are
more than 0.05 for the cofidence level 95%.

VII.

MATHEMATICAL MODELING

The multiple linear regression model
developed for material removal rate and surface
roughness (Ra) using the MINITAB 16. The
predictors are speed, feed, DOC and nose radius.
The regression equation for
MRR = - 4141 + 1555 Speed (A) + 1054 Feed (B)
+ 2329 DOC (C) - 204 Nose Radius (D)

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The significance of each coefficient in the
equation and the regression model were analyzed by
ANOVA and tested by the p value and statistics and
ANOVA results for regression models are reported
in the table 9. Regression statistics indicate that
coefficients for speed is statistically significant.
ANOVA results of the regression shows that
regression model for Ra is statistically significant at
95% confidence level (p < 0.05). The standard
deviation of error is 1339.91. The value of R-Sq
(87.4%) implies that 87.4% of variation in response
values can be explained by the variations in the
control factors considered. The value of R-Sq (adj)
is 70.6 %. A high value of determination coefficient
confirms model adequacy, goodness of fit and high
significance of model. This indicates that the
regression model for the response can be used for
determining and estimating MRR.
The regression equation for surface
roughness is
Ra = 10.8 - 1.50 Speed (A) + 2.05 Feed (B) + 0.875
DOC (C) - 3.07 Nose Radius (D)
Table 10: Regression Table for Ra
Predictor Coef
SE Coef T
Constant 10.842
1.751
6.19
A
-1.504
0.2727
-5.52
B
2.045
0.6098
3.35
C
0.875
0.6098
1.43
D
-3.075
0.6098
-5.04
Analysis of Variance

P
0.008
0.012
0.044
0.247
0.015

P
0.225
0.035
0.347
0.091
0.843

Analysis of Variance
Source
DF
SS
MS
F
P
Regression 4 373335794 9333948 5.2 0.1023
Residual
3
5386073
1795358
Error
Total
7
42721866
S = 1339.91 R-Sq = 87.4% R-Sq(adj) = 70.6%

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DF

SS

MS

F

P

Regression

4

51.427

12.857

17.29

0.021

Residual
Error

3

2.231

0.744

Total
Table 9: Regression Table for MRR
Predictor
Coef
SE Coef
T
Constant
- 4141
2721
-1.52
A
1555.0
423.7
3.67
B
1053.9
947.5
1.11
C
2329.3
947.5
2.46
D
-203.9
947.5
-0.22

Source

7

53.658

S = 0.862340 R-Sq = 95.8% R-Sq(adj) = 90.3%
ANOVA results for regression models are
reported for Ra in the table 10. Regression statistics
indicate that coefficients for speed, feed and nose
radius are statistically significant. ANOVA results
of the regression shows that regression model for Ra
is statistically significant at 95% confidence level (p
< 0.05). The standard deviation of error is 0.862340.
The smaller the value of S indicate stronger the
linear relationship. The value of R-Sq (95.8%)
implies that 95.8% of variation in response values
can be explained by the variations in the control
factors considered. The value of R-Sq (adj) is 90.3
%. A high value of determination coefficient
confirms model adequacy, goodness of fit and high
significance of model. This indicates that the
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regression model for the response can be used for
determining and estimating Ra.
[5]

VIII.

CONCLUSION

The present study was carried out to study
the effect of input parameters on the material
removal rate and surface roughness. The following
conclusions have been drawn from the study:
1. The Material removal rate is mainly affected by
spindle speed and depth of cut and for surface
roughness the most significant factors are
cutting speed and nose radius.
2. The least significant factor for MRR is nose
radius and for surface roughness is DOC.
3. Linear regression model constructed is used to
predict MRR and surface roughness Ra.
4. The parameters considered in the experiments
are optimized to attain maximum material
removal rate. The best setting of input process
parameters for turning (maximum material
removal rate) within the selected range is as
follows:
i) Spindle speed i.e. 1235 rpm.
ii) Feed rate i.e. 0.142mm/rev.
iii) Depth of cut should be 0.99
iv) Nose radius 1.5 mm.
5. The best setting of input process parameters for
surface roughness in turning within the selected
range is as follows:
i) Spindle speed i.e. 1235 rpm.
ii) Feed rate i.e. 0.142mm/rev.
iii) Depth of cut should be 0.495
iv) Nose radius 1.5 mm.

[6]

[7]

[8]

[9]

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