Download VTU BE 2020 Jan ME Question Paper 18 Scheme 3rd Sem 18MEA305 Metal Cutting and Forming

Download Visvesvaraya Technological University (VTU) BE ( Bachelor of Engineering) ME (Mechanical Engineering) 2018 Scheme 2020 January Previous Question Paper 3rd Sem 18MEA305 Metal Cutting and Forming

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4A/18M.EA305
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Third Semester B.E. Degree Examination, Der.
-
gaR1 an.2020
Metal Cutting and Forming=
Time: 3 hrs. Max. Marks: 100
Note: Answer any FIVE full questions, choosing ONE full question from each module.
Module-1
1 a. Name and explain with example the different types of chips formed during metal cutting.
(06 Marks)
b. Draw Merchant's circle diagram and state the assumptions made in establishing the
relationship among the various forces. ' (08 Marks)
c. During an orthogonal cutting process the folloWing observations were made-chip
, ,_ ?
.._
thickness = 0.62mm feed 0.2 mm rake angle 15?. Calculate the chip reduction coefficient
...?.. ,
. --=, and shear angle.
''''
(06 Marks)
II
.7?11
7, X
OR
:-:., -J-
.
i
2 a. Differentiate between Turret lathe and Capstan lathe_ (06 Marks)
A., a b_ Draw the tool layout for producing a hexagonal headed bolt on a capstan lathe from a
.E.
?
. 1-,
hexagonal bar stock. Assume the dimensions. (08 Marks)
c .?.
c. Write the functions of following lathe accessories
.11
.:.-. .0
(i) Live centre (ii) Dead centre (iii) Steady rest (iv) Follower rest
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v
(v) Dogs and face plates_ (06 Marks)
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Module-2
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3 a. With sketch write the comparison between up milling and down milling. (06 Marks)
3
c
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(08 Marks)
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c. What is indexitIg? Name the different methods of indexing and explain compound indexing.
? m (06 Marks)
r.,, ._.
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4 a_ Differentiate Shaper and Planer?
(06 Marks)

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With sketch explain the external centreless grinding highlighting the feed mechanism.
c.n
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(08 Marks)
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a,
,,,,
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e. How the shapers are classified? How a vertical shaper is different from slotter. (06 Marks)
width = 6inm and feed per cycle = 15mm. (06 Marks)
tb
? to
a
--
6.. v, Module-3
E >
5 a. Write a note on functions and types of cutting fluids used in metal cutting. (06 Marks)
0
?
a-,
, .7., ?

b. Explain the various mechanisms responsible for different forms of tool wear. (08 Marks)
._: r,i c. A cast iron plate of dimensions 450x 150X6() mm, is to be rough shaped along its wider face.
O Calculate the machining time taking cutting speed = 10 mprn, return speed = 15 mpm,
approach length = 30mm, over travel length = 30 mm, allowance on either side of the plate
I oft
USN
FirstRanker.com - FirstRanker's Choice
Oci
LL':::
7
:?
:
'/f81%
.
*
:
4A/18M.EA305
?
,
Third Semester B.E. Degree Examination, Der.
-
gaR1 an.2020
Metal Cutting and Forming=
Time: 3 hrs. Max. Marks: 100
Note: Answer any FIVE full questions, choosing ONE full question from each module.
Module-1
1 a. Name and explain with example the different types of chips formed during metal cutting.
(06 Marks)
b. Draw Merchant's circle diagram and state the assumptions made in establishing the
relationship among the various forces. ' (08 Marks)
c. During an orthogonal cutting process the folloWing observations were made-chip
, ,_ ?
.._
thickness = 0.62mm feed 0.2 mm rake angle 15?. Calculate the chip reduction coefficient
...?.. ,
. --=, and shear angle.
''''
(06 Marks)
II
.7?11
7, X
OR
:-:., -J-
.
i
2 a. Differentiate between Turret lathe and Capstan lathe_ (06 Marks)
A., a b_ Draw the tool layout for producing a hexagonal headed bolt on a capstan lathe from a
.E.
?
. 1-,
hexagonal bar stock. Assume the dimensions. (08 Marks)
c .?.
c. Write the functions of following lathe accessories
.11
.:.-. .0
(i) Live centre (ii) Dead centre (iii) Steady rest (iv) Follower rest
o
,4
,
v
(v) Dogs and face plates_ (06 Marks)
Q
)

TZ'
.
15
.C. " ----
O ?Ci
Module-2
,. .1.) 0
Ct
.
CI
I '6'
3 a. With sketch write the comparison between up milling and down milling. (06 Marks)
3
c
'7' ,
,s
. , 71
>, -," ?
(08 Marks)
? ,,,
c. What is indexitIg? Name the different methods of indexing and explain compound indexing.
? m (06 Marks)
r.,, ._.
cam.

---
-
tl? -,
-
, - c
z
,
L.) d.
OR
2
u 7,
4 a_ Differentiate Shaper and Planer?
(06 Marks)

?
;4_-,
? .,7_, . b.
With sketch explain the external centreless grinding highlighting the feed mechanism.
c.n
cc ,-,
(08 Marks)
o
?
?
a,
,,,,
-
e. How the shapers are classified? How a vertical shaper is different from slotter. (06 Marks)
width = 6inm and feed per cycle = 15mm. (06 Marks)
tb
? to
a
--
6.. v, Module-3
E >
5 a. Write a note on functions and types of cutting fluids used in metal cutting. (06 Marks)
0
?
a-,
, .7., ?

b. Explain the various mechanisms responsible for different forms of tool wear. (08 Marks)
._: r,i c. A cast iron plate of dimensions 450x 150X6() mm, is to be rough shaped along its wider face.
O Calculate the machining time taking cutting speed = 10 mprn, return speed = 15 mpm,
approach length = 30mm, over travel length = 30 mm, allowance on either side of the plate
I oft
USN
18ME35A/18MEA305
OR
6 a. Which are the different forms of wear on the cutting edge of a tool? With appropriate sketch
explain. (06 Marks)
b. Explain the critical cutting parameters which effect the tool life. (08 Marks)
c. The tool life for a HSS tool is expressed by the relation VT" = C
;
and for Tungsten-Carbide
VT
L5
= C2. If the tool life for cutting speed of 24 mpm is 128 min, compare the life of the
two tools at a speed of 30 mpm. (06 Marks)
Module-4
7 a. List the differences between cold working and hot working. (06 Marks)
b. What is forging? Explain the working of board hammer with sketch. (08 Marks)
c. With sketch explain : (i) Two high rolling mill (ii) Planetary rolling mill. (06 Marks)
OR
8 a. How the extrusion process is classified? Write a note on the difference between direct an9_
indirect extrusion. (06 Marks)
b. With neat sketch explain the wire drawing process. (08 Marks)
C. Explain the defects in extruded products. (06 Marks)
Module-5
9 a. With a neat sketch explain V-bending and edge bending operations. (06 Marks)
b. What do you mean by dies? Write brief note on (i) Progressive dies (ii) Combinati on dies.
(08 Marks)
c. With neat sketch explain shearing of sheet metal. (06 Marks)
10 a.
b.
C.
OR
What is stripper? With neat sketch explain fixed plate stripper. (06 Marks)
With a neat labeled sketch explain the parts of open back inclinable press. (08 Marks)
Calculate the bending force for the 90? bend part from the steel sheet with air bending. The
bend length is 30 cm, the material thickness is 2.5 mm and beam length is 25mm. The
tensile strength of the material is 32 kN/cm
2
. Die opening factor = 1.33. (06 Marks)

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