:-Attempt all questions. All questions carry equal marks.
Attempt any fourparts ofthe following
(a) What are the various
(4x5=20)
:
types of chips ? Under what
conditions is eachformed ?
O)
Explainthe Merchant's force circle diagram and derive the shear angle relationship 20 + F - cr = nf 2 ,whete Q is the shear angle, B is the friction angle and o is the rake angle. State the assumptions made in the developments of suchadiagram.
When the rake angle is zero during orthogonal cutting,
showthat
r< (1 -pr)r ,l = ,**
Where symbols have their usual meanings.
(e) Draw the tool geomety
of
a single
point cutting tool ard
show the different angles.
EME503/pNG-51825
[Turn Over
2.
Attempt any two parts ofthe following
(a) What is the difference
:
Qxto--20)
between Capstan and Tunet lathe ?
What are the standard and special tools used on these machines
?
How are these tools different to engine lathe
tools ?
O) Discuss the vafious criteria rsed for optimizing
tlre cutting
conditions. A cylindrical bar is to be tumed. The ma:
allowable feed is 0.2 mm/revolution and atthis feedrate
Thylols tool life equation for atool-work combination is found to be VT'025: 75. The labor cost involved in each regrinding ofthe tool is Rs. 5.00. On the average, it takes about2 minutesto changethetool. Findthe cutting speed that
will
lead to maximum production rate. Derive the
formulaused.
(c)
What are the main differences between a shaper and a planer
?
Discussthe differentdrivemechanisms used in
shaper with the help of suitable diagram.
3.
Attemptanytwopartsofthefollowing
(a) What are the various selection of
O) (,
a
(2x10=20)
factors to be considered in the
grinding wheel
? Discuss each
in detail.
Why surface finish is important for many applications
G)
:
?
Illusfate your answer.
Eaplain the I-apping process. State its uses, limitations
andadvantages.
(c)
Explain the factors which affect the surface finish in plain millingoperations.
EME503/DNG-51825
A steel block of 20 mm width is being milled using a sraight slab milling cutter with 20 teet[ 50 mm diameter, and l0o radial rake. The feed velociry of the table is 15 mm/min and the cutter rotates at 60 rpm. Ifa depth of cut of I mm is use{
whatwill
thepowerconsumption ? Assume shEar-strength (k) of steel is 250 N/mm2 and tool-chip interface friction p = 9.3.
4.
be
Attempt any two parts ofthe following
:
(2x10=20)
(a) Explain
with neat sketch the working and applications thefollowing:
(,
of
Coated anduncoated electrode welding
G) Atomichydrogenwelding. (b) G) Describe the submerged arc welding process with the help of a suitable diagram. What are the advantages and applications ofthis process ?
(ii)
Compare electo-slag welding process with that of submerged arc welding from standpoint of heat liberated, j oint preparation and welding position.
(c)
Describe the oxy-acetylene welding equipments. Draw the different types offlames used in gas welding. FIow
would you identifu these flames ? What are the specific uses ofeach ofthese flames ? 5.
Attemptanytwo parts ofthe following
:
(2xtg=2n;
(a) What are the main parameters to be considered selecting
a
while
particular unconventional machining process
andwhy? EME503IQNG{t82s
[Turn0ver
rHow metal removal in EDM is achieved any one sparkgeneratorused
G)
?
Discuss
inEDM.
Draw a neat sketch of the Electrode feeding mechanismusedinEDM
(c)
G)
What are the applications ofultrasonic machining ?
Whj
can very hard material be better cut by the
ultrasonic process than soft ones ?
(ii)
Compare ECM with EDM. Why isn't ECM as widelyusedas EDM ?
UPTU B.Tech Manufacturing Science-II EME-503 Sem 5_2013-14.pdf
(a) What is the difference between Capstan and Tunet lathe ? What are the standard and special tools used on these. machines ? How are these tools different ...
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