U044134144

Mohd.Rafeeq et al Int. Journal of Engineering Research and Applications www.ijera.com
ISSN : 2248-9622, Vol. 4, Issue 4( Version 1), April 2014, pp.134-144
www.ijera.com 134 | P a g e
Optimizing Feed and Radial Forces on Conventional Lathe
Machine of En31b Alloy Steel through Taguchi’s Parameter
Design Approach
Mohd. Rafeeq1
, Mudasir M Kirmani2
1
Assistant Professor (Mechanical Engineering), Maulana Azad National Urdu University, Hyderabad, A.P.,
India.
2
Assistant Professor (computer Science), SKUAST-K, Srinagar, J&K, India.
Abstract
The present paper outlines an experimental study to obtain an optimal setting of turning process parameters
(cutting speed, feed rate and depth of cut) resulting in an optimal values of the feed force and radial force when
machining EN31B steel with TiC-coated tungsten carbide inserts. The effects of cutting parameters on the feed
and radial force were experimentally investigated. Experimentation was conducted as per Taguchi's orthogonal
array. Three cutting parameters with three levels are arranged in L9 orthogonal array. The orthogonal array,
measured values of feed and radial force, signal-to-noise ratios, and analysis of variance are employed in order
to study the feed force and radial force. The analysis of the results shows that the optimal settings for low values
of feed and radial forces are high cutting speed, low feed rate and depth of cut.
Keywords. Cutting parameters; turning process; feed force; radial force Taguchi technique; EN31B steel;
coated carbide inserts.
I. INTRODUCTION
In today’s rapidly changing scenario in
manufacturing industries, applications of
optimization techniques in metal cutting processes is
essential for a manufacturing unit to respond
effectively to severe competitiveness and increasing
demand of quality product in the market.
Turning is the most widely used among all
cutting processes. The increasing importance of
turning operations is gaining new dimensions in the
present industrial age, in which the growing
competition calls for all the efforts to be directed
towards the economical manufacturing of machined
parts .Researchers have focused on improving the
performance of turning operation with the aim of
minimizing time, costs and improving quality of
manufactured products. Machinability of materials in
turning is studied usually in terms of feed and radial
forces, cutting temperature, surface quality and tool
wear. Forces play a major role in the machinability
evaluation of the material. A lower feed and radial
force is always preferred for long tool life, lower
deflection, lesser power consumption and improved
surface finish. Finding process parameters that
optimize feed and radial force is an important task
towards enhancing efficiency of machining process.
This study helpful in evaluating optimum
machining parameter like tool geometry, tool
material, cutting speed, feed and depth of cut for
forces for turning EN31B steel on kirloskar Lathe
machine. Taguchi’s parameter optimization method
is used to evaluate best possible combination for
minimum cutting force during machinability. The
literature survey reveals that the machining of
difficult-to-machine materials like EN31B is
relatively a less researched area. The objective of this
case study is to obtain optimal settings of turning
process parameters –cutting speed, feed rate and
depth of cut, to yield optimal feed and radial forces
while machining EN31B steel with TiC-coated
carbide tools. Taguchi’s parameter design approach
has been used to accomplish this objective.
II. TAGUCHI METHOD
Taguchi method of design of experiment [1,
2] is a relatively simple and powerful tool for
systematic modelling, analysis and optimization of
the machining process. Taguchi method includes
selection of parameters, experimental design,
conducting an experiment, data analysis, determining
the optimal combination, and verification. Noorul
and Jeyapaul [3] adopted orthogonal array, Grey
relational analysis in the ANOVA using Taguchi
method to find suitable level of identified parameters,
and significant association of parameters in order to
increase multiple response efficiency of parameters
in driller operation for Al/SiC.
By this method the product quality is
defined in terms of loss function (S/N ratio), due to
deviation of the product's functional characteristics
RESEARCH ARTICLE OPEN ACCESS

from its desired target value. Taguchi method uses a
special design of orthogonal arrays (OA), where the
experimental results are transformed into signal-to-
noise (S/N) ratio as the measure of the quality
characteristic. An OA is a small fraction of full
factorial design and assures a balanced comparison of
levels of any parameter or interaction of parameters.
The columns of an OA represent the experimental
parameters to be optimized and the rows represent
the individual trials (combinations of levels).
Traditionally, data from experiments are used to
analyze the mean response. Taguchi method
estimates the effects of factors on the response mean
and variation. In Taguchi method the mean and the
variance of the response (experimental result) at each
parameter setting in OA are combined into a single
performance measure known as the signal-to-noise
(S/N) ratio. Taguchi method utilizes the S/N ratio
approach to measure the quality characteristic
deviating from the desired value. The S/N ratio is a
quality indicator by which the experimenters can
evaluate the effect of changing a particular
experimental parameter on the performance of the
process. Depending on the criterion for the quality
characteristic to be optimized, the S/N ratio
characteristics can be divided into three stages:
smaller-the-better, larger-the-better, and nominal-the-
better. Regardless of the category of the performance
characteristic, the larger S/N ratio corresponds to the
better performance characteristic. Therefore, the
optimal level of the parameter is the level with the
highest S/N ratio. The optimal parameter levels are
determined using the analysis of means and analysis
of variance (ANOVA). A confirmation experiment is
the final step in Taguchi method and it is used to
verify the optimal combination of the parameter
settings.
There are some studies regarding
optimization of cutting parameters based on cutting
force in turning operation using Taguchi method.
Singh & Kumar [1] have applied Taguchi method for
force in a longitudinal turning of an alloy steel EN24.
Controlled factors are cutting speed, feed and depth
of cut with three levels. Response factor is main
cutting force. They applied L27 orthogonal array with
interactions. Petropoulos et al. [2] have applied
Taguchi method for optimization of cutting
parameters based on cutting force in a longitudinal
turning of carbon steel St37. Controlled factors are
spindle speed, feed and depth of cut with four levels.
Response factors are main cutting force, feed force
and passive force. They applied L16 orthogonal array
with interactions. In another paper, Singh & Kumar
[4] have applied Taguchi method in order to optimize
cutting parameters based on cutting force in a
longitudinal turning of an alloy steel EN24. One can
consider that the controlled factors are cutting speed,
feed and depth of cut with three levels. Response
factor is feed force. They applied L27 orthogonal
array, by taking into consideration the interactions.
Aggarwal et al. [5] have applied Taguchi method for
force in a longitudinal turning of tool steel P20.
Controlled factors are cutting speed, feed, depth of
cut, nose radius and cutting environment with three
levels. Response factors are feed force and passive
force. They applied L27 orthogonal array with
interactions. Hanafi et al. [6] have applied Taguchi
method for optimization of cutting parameters based
on cutting force and surface roughness in a
longitudinal turning of carbon fiber PEEK CF30.
Controlled factors are cutting speed, feed and depth
of cut with three levels. Response factors are main
cutting force and surface roughness. They applied L27
orthogonal array with interactions.
2.1 TAGUCHI EXPERIMENT: DESIGN AND
ANALYSIS
Essentially, traditional experimental design
procedures are too complicated and not easy to use.
A large number of experimental works have to be
carried out when the number of process parameters
increases. To solve this problem, the Taguchi method
uses a special design of orthogonal arrays to study the
entire parameter space with only a small number of
experiments [7].
Taguchi methods [8] have been widely
utilized in engineering analysis and consist of a plan
of experiments with the objective of acquiring data in
a controlled way, in order to obtain information about
the behavior of a given process. The greatest
advantage of this method is the saving of effort in
conducting experiments; saving experimental time,
reducing the cost, and discovering significant factors
quickly. Taguchi’s robust design method is a
powerful tool for the design of a high-quality system.
In addition to the S/N ratio, a statistical analysis of
variance (ANOVA) can be employed to indicate the
impact of process parameters on metal removal rate
values. In general, the parameter optimization
process of the Taguchi method is based on 8-steps of
planning, conducting and evaluating results of matrix
experiments to determine the best levels of control
parameters [9]. Those eight steps are given as
follows.
 Identify the performance characteristics
(responses) to optimize and process parameters
to control (test).
 Determine the number of levels for each of the
tested parameters.
 Select an appropriate orthogonal array, and
assign each tested parameters into the array.

 Conduct an experiment randomly based on the
arrangement of the orthogonal array.
 Calculate the S/N ratio for each combination of
the tested parameters.
 Analysis the experimental result using the S/N
ratio and ANOVA test.
 Find the optimal level for each of the process
parameters.
 Conduct the confirmation experiment to verify
the optimal process parameters.
III. EXPERIMENTAL SET-UP AND
PROCESS PARAMETER
SELECTION
3.1 Work piece material
The work piece material selected for
investigation was EN31B alloy steel with high tensile
strength, shock resistance, good ductility and
resistance to wear and ﬁnds its applications in the
manufacturing of punches and dies. EN31B alloy
steel is density: 7.81 g cm-1
, Hardness: 58 to 62 HRC,
Modulus of Elasticity: 210GPa and Shear Modulus:
80GPa. The chemical composition of work piece
material is given in Table 1.
Table 1. Chemical Composition of Work Piece Material
Constituent C Mn Si P Cr S
%
composition
0.98 0.25 0.15 0.025 1.3 0.025
3.2 Turning process parameters
To identity the process parameters affecting
the selected machining quality characteristic of
turned parts. An Ishikawa cause –effect diagram was
constructed and shown in Fig 1.The identiﬁed
process parameters were the cutting tool parameters –
tool geometry, tool material, the cutting parameters –
spindle speed, feed rate, depth of cut, work piece-
related parameters – hot-worked, difficult-to-
machine.
Fig 1: Ishikawa cause –effect diagram
The following process parameters were thus
selected for the present work: Cutting speed –(A),
feed rate – (B), depth of cut – (C), tool material –
TiN coated tungsten carbide inserts of Widia make,
the tungsten carbide inserts used were of ISO
coding CNMG 120404 and tool holder of ISO
coding PCLNR 1616H07 , work material –EN31B
steel, and environment – dry cutting.
3.3 Plan of Experiment
Taghuchi methods which combine the
experiment design theory and quality loss function
concept have been used in developing robust design
of product and process and in solving more taxing of
manufacturing[10] .the degree of freedom of three
parameter in each of three levels are calculated as
follows [11].
Degree of freedom (DOF) = number of levels -1
For each factor.DOF equal to;
For (A); DOF=3-1=2
For (B); DOF=3-1=2
For (C); DOF=3-1=2
In this paper nine experiments were
conducted at different parameter. For this Taghuchi L9
orthogonal array was used, which has nine rows
corresponding to the number of tests, with three
columns at three levels. L9 orthogonal array has 8
DOF, in which 6 were assigned to three factors (each
one 2 DOF) and 2 DOF was assigned to the error. For
the purpose of observing the degree of influence of
the parameter in machining three parameter at all
three levels are taken into account. The cutting
parameter identified were spindle speed, feed rate and

depth of cut. The controls parameter and their level is indicated in Table 2.
Table 2. Process parameters with their values at 3 levels
Parameter Process parameters Level 1 Level 2 Level 3
A Spindle speed(RPM) 224 500 775
B Feed rate (mm/rev) 0.12 0.15 0.18
C Depth of cut (mm) 1 1.25 1.5
Table 3. Orthogonal Array L9 of Taguchi
Experiment. no. Spindle speed (RPM) Feed rate (mm/rev) Depth of cut (mm)
1 224 0.12 1
2 224 1.15 1.25
3 224 0.18 1.50
4 500 0.12 1.25
5 500 0.15 1.50
6 500 0.18 1.00
7 775 0.12 1.50
8 775 0.15 1.00
9 775 0.18 1.25
3.4 Experiment set-up
EN321B steel rods (40 mm diameter and 250 mm
length) turned on kirloskar lathe. Titanium carbide –
coated inserts is used to machine the work material
EN31B .Specimens is turned for each trial condition
given in Table-3. Using random technique, nine
experiments is thus turned and feed force and radial
force is measured with a three dimensional turning
dynamomter.The dynamometer capable of taking
reading in kgf units. The readings have been
converted into Newton in Table 4. A photograph of
experimental set –up is shown in Fig 2.
Fig 2.
A pictorial
view of
experimental
set –up

Table 4. Experiment Data of Feed Force and Radial Force
Trail Spindle speed Feed rate Depth of cut Feed force Radial force
no. (rpm) (mm/rev) (mm) (N) (N)
1 224 0.12 1.00 49.05 29.43
2 224 0.15 1.25 78.48 49.05
3 224 0.18 1.50 98.10 78.48
4 500 0.12 1.25 58.86 29.43
5 500 0.15 1.50 88.29 68.67
6 500 0.18 1.00 68.67 39.24
7 774 0.12 1.50 88.29 68.67
8 774 0.15 1.00 68.67 39.24
9 774 0.18 1.25 78.48 49.05
Total 676.89 451.26
TFF = Overall mean of feed force = 75.21 N TRF = Overall mean of radial force = 50.14N
IV. RESULTS AND ANALYSIS OF
EXPERIMENTS
4 .1 Analysis of the signal to noise (S/N) ratio
In the Taguchi approach, the term signal
represents the desired value (mean) for the output
characteristics and term noise represents the
undesirable value (standard deviation) for the output
characteristics. Taguchi uses the S/N ratio to measure
the quality characteristics deriving from desired value
.There are several S/N ratio available depending upon
of characteristic: lower is better, smaller is better or
higher is better. The experimental data for the feed
and radial forces have been reported in Table 5. Feed
and radial forces being ‘smaller is better’ a type of
machining Quality characteristic, the S/N ratio for
these types of response was used and is given below.
[12]
where y1, y2,…yn are responses of the machining
characteristic for a trail condition repeated n times.
The S/N ratios were computed using equation (1) for
each of the nine trail and the results are reported in
Table 5 along with the raw data value.
Table 5. Experimental Results of Feed Force and Radial Force
Factors Feed force S/N ratio Radial force S/N ratio
(N) (db) (N) (db)
Trail Spindle Feed Depth
no. speed rate of cut
(rpm) (mm/rev) (mm)
1 224 0.12 1.00 49.05 -33.81 29.43 29.37
2 224 0.15 1.25 78.48 -37.89 49.05 33.81
3 224 0.18 1.50 98.10 -39.83 78.48 37.89
4 500 0.12 1.25 58.86 -35.39 29.43 29.37
5 500 0.15 1.50 88.29 -38.91 68.67 36.73
6 500 0.18 1.00 68.67 -36.73 39.24 31.91
7 774 0.12 1.50 88.29 -38.91 68.67 36.73
8 774 0.15 1.00 68.67 -36.73 39.24 31.73
9 774 0.18 1.25 78.48 -37.89 49.05 33.81
The mean response refers to the average
value of each performance characteristic for each
parameter at level 1, 2 and 3 are calculated and are
given in Table 6 and 7. The tables include ranks
based on delta statistics, which compare the relative
magnitude of effects. The delta statistic is the highest
minus the lowest average for each factor. The effects
of process parameters on feed force are given in Fig-
1 while as effects of process parameters on radial
force are given in Fig-4.
TABLE 6. AVERAGE VALUES (RAW DATA: FEED FORCE)
Process parameter
Designation
Average values of feed force(N) Delta Rank
L1 L2 L3
A 75.21 71.64 78.54 6.53 3
B 64.40 78.48 81.75 16.36 2
C 62.13 71.94 91.56 29.42 1

TABLE 7. AVERAGE VALUES (RAW DATA: RADIAL FORCE)
Process parameter
Designation
L1 L2 L3
A 52.32 45.32 52.30 6.54 3
B 42.49 52.32 55.59 13.10 2
C 35.97 42.51 71.90 35.42 1
Fig 3. Effects of Process Parameters on feed force (Raw Data)
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70
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80
70
60
spindle speed
MeanofMeans
feed rate
depth of cut
Main Effects Plot for Means
Data Means
Fig 4. Effects of Process Parameters on radial force (Raw Data)
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50
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60
50
40
spindle speed(rpm)
MeanofMeans
feed rate(mm/rev)
depth of cut (mm)
Main Effects Plot for Means
Data Means
The average value S/N ratio of various parameters at different levels are calculated and shown in Table 8 and 9.
The level of a factor with the highest S/N ratio is the optimum level for responses measured.
TABLE 8. S/N RATIO AVERAGE VALUES (RAW DATA: FEED FORCE)
Process parameter
Designation
L1 L2 L3
A -37.17 -37.01 -37.84 0.83 3
B -36.04 -37.84 -38.15 2.11 2
C -35.76 -37.61 -39.22 3.46 1

TABLE 9. S/N RATIO AVERAGE VALUES (RAW DATA: RADIAL FORCE)
Process parameter
Designation
L1 L2 L3
A -33.69 -32.67 -34.09 1.48 3
B -31.82 -34.09 -34.55 2.70 2
C -31.00 -32.33 -37.12 6.08 1
The average value S/N ratio of Effects of Process Parameters on Feed Force (S/N Data) is shown in Fig-5 and
the Effects of Process Parameters on radial force (S/N Data) is shown in Fig-6.
Fig 5. Effects of Process Parameters on Feed Force (S/N Data)
Fig 6. Effects of Process Parameters on radial force (S/N Data)
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spindle speed(rpm)
MeanofSNratios
feed rate(mm/rev)
depth of cut (mm)
Main Effects Plot for SN ratios
Data Means
Signal-to-noise: Smaller is better
From the S/N ratio analysis in Fig. 5-6, the
optimal machining conditions are 500 rpm spindle
speed (level 2), 0.12 mm/rev feed rate (level 1) and
1mm depth of cut (level 1) for feed force and 500
rpm spindle speed (level 2), 0.12 mm/rev feed rate
(level 1) and 1mm depth of cut (level 1) for radial
force, respectively.
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-37
-38
-39
spindle speed
MeanofSNratios
feed rate
depth of cut
Main Effects Plot for SN ratios
Data Means
Signal-to-noise: Smaller is better

4.2 Analysis of Variance (ANOVA)
ANOVA is a statistically based, objective
decision-making tool for detecting any differences in
the average performance of groups of items tested.
ANOVA helps in formally testing the significance of
all main factors and their interactions by comparing
the mean square against an estimate of the
experimental errors at specific confidence levels.
First, the total sum of squared deviations SST from
the total mean S/N ratio nm can be calculated as [13]:
where n is the number of experiments in the
orthogonal array and ni is the mean S/N ratio for the
ith
experiment.
Statistically, there is a tool called an F-test,
named after Fisher [14], to see which design
parameters have a significant effect on the quality
characteristic. In the analysis, the F-ratio is a ratio of
the mean square error to the residual error, and is
traditionally used to determine the significance of a
factor. The contribution of parameter for feed forces
is shown in Table 10 and11.
TABLE 10. ANOVA RESULTS (RAW DATA: FEED FORCE)
Source Degree of
freedom
Sum of
squares
variance F-ratio Percentage
A 2 63.90 31.95 1.00 3.321
B 2 449.89 224.94 7.04 23.38
C 2 1346.0 673.00 21.07 69.97
Error 2 63.90 31.95 3.32
Total 8 1923.68 100
Tabulated F-ratio at 95% confidence level :F(0.05; 2;2) =19.0000
*Significant at 95% confidence interval
TABLE 11. S/N ANOVA RESULTS (RAW DATA: FEED FORCE)
Source Degree of
freedom
Sum of
squares
A 2 1.1644 0.5822 0.82 4.049
B 2 7.8302 3.9151 5.50 27.23
C 2 18.3345 9.37115 12.58 63.76
Error 2 1.4229 0.7115 4.948
Total 8 28.7520 100
Tabulated F-ratio at 95% confidence Level: F (0.05; 2;2) =19.0000
It reveals that the influence of depth of cut
in affecting the feed force is significantly larger
followed by that of feed rate, spindle speed has little
influence on feed force on feed force. The
contribution of parameter for radial force as shown in
Table 12 and 13.The results are similar to feed rate.
TABLE 12. ANOVA RESULTS (RAW DATA: RADIAL FORCE)
Source Degree of
freedom
Sum of
squares
A 2 85.33 42.66 4.03 3.299
B 2 278.78 139.39 13.17 10.78
C 2 2200.56 1100.28 103.96 85.10
Error 2 21.17 10.25 0.818
Total 8 25585.83 100
Tabulated F-ratio at 95% confidence Level: F(0.05; 2;2) =19.0000

TABLE 13. S /N ANOVA RESULTS (RAW DATA: RADIAL FORCE)
Source Degree of
freedom
Sum of
squares
A 2 3.445 1.722 1.77 4.321
B 2 12.79 6.399 6.58 16.05
C 2 61.52 30.76 31.61 77.18
Error 2 1.946 0.973 2.441
Total 8 79.709 100
Tabulated F-ratio at 95% confidence level:F(0.05; 2;2) =19.0000
V. ESTIMATION OF OPTIMUM
RESPONSE CHARATERISTICS
Two factors (feed rate and depth of cut) are
found significant in both raw data and S/N data
analysis for the selected machining characteristic
.Lowest levels of feed rate and depth of cut are the
most desired conditions for both feed and radial force
is considered.
The estimated mean of the response characteristic can
be computed as [14].
µFF=B1+C1-TFF ……. (4)
Where,
B1= average value of feed force e at the
first level of feed rate = 64.40 N
C1 = average value of feed force at the
third level of depth of cut = 62.13N
TFF =overall mean of feed force =75.21 N
Substituting the values of various terms in the above
equation,
μFF = 64.40 + 62.13 – 75.51 =
51.32N
The 95 % confidence interval for predicted mean on a
confirmation run can be calculated by using the
following equations [14].
where, Fα (1, fe) = The F ratio required for α , α =
risk , fe =error DOF, Ve =error variance ,
neff= effective number of replications
R = Sample size for confirmation experiments, N =
Total number of experiment.
Using the values Ve=31.95, fe =2 from (Table 10),
the confidence interval was calculated.
Total DOF associated with the mean
(neff) =2+2 =4, N=9
= 9 / (1 + 4) = 1.8, α=0.05,
F0.05;(1,2)=18.51(Tabulated F value)
The calculated CICE is: CI = ± 22.91.
The predicted mean of feed force is: μFF =
51.32N
The 95% confidence interval of the
predicted feed force is [μFF – CI] < μFF < [μFF + CI ]
i.e. 28.41< μFF < 74.23
Similar calculation done for radial force results in
µRF=B1+C1-TRF
The predicted mean of feed force is: μRF = 28.32N
±13.18
The 95% confidence interval of the predicted radial
force is [μRF – CI] < μRF < [μRF + CI ] i.e. 15.22<
μRF < 41.42
VI. CONFIRMATION EXPERIMENT
In order to validate the results obtained,
three confirmation experiments were conducted of
the response characteristics (feed and radial force) at
optimal levels of the process variables. The
confirmation experiment is a crucial step and is
highly recommended by taguchi to verify the
experimental conclusion [14].
The average values of the characteristics were
obtained and compared with the predicted values.
The values of feed force and radial force obtained
through confirmation experiments are within the 95%
of CI of respective response characteristic. Three
confirmation experiments were thus conducted at the
optimal settings of the turning process parameters
recommended by the investigation. The average
value of feed force 44.78 N and that for radial force
as 26.16 N while turning EN31B steel with TiN
coated carbide inserts.

VII. CONCLUSIONS
The following conclusions can be drawn
from this study:
 Statistically designed experiments based on
Taguchi methods were performed using L9
orthogonal arrays to analyze forces as response
variable. Conceptual S/N ratio and ANOVA
approaches for data analysis drew similar
conclusions.
 Statistical results(at a 95% confidence level)
shows that the depth of cut, and feed rate in
affecting the variation of feed and radial forces
are significantly larger as compared to the
contribution of spindle speed.
 The optimal settings of various process
parameters for machined parts to yield
optimal feed force are: spindle speed
=500rpm(A2) ; feed rate = 0.12 mm/rev (B1);
depth of cut =1mm (C1).Optimal radial force is
obtained at same levels of parameters.
 The predicted of optimal feed force and radial
force are 28.41< μFF (N) < 74.23 and 15.22< μRF
(N)< 41.42.
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