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Roll No…………….
Total No. of
Questions: 08
M.Tech
(PE) (Sem.- 1st)
METAL
CUTTING
Subject
Code: PE-502
Paper
ID: E0442
Time: 3 Hrs. Max.
Marks: 100
Instruction to
Candidates:
1)
Attempt
any five questions out of eight.
2)
Each
question carries TWENTY marks.
Q1)
(a)
What
are the various mechanisms of chip formation during maching of mild steel?
(b)
Explain
the concept of shearing strain for chip deformation.
Q2)
(a)
A
metal cutting test results indicates that for a given operation the optimum
rake should be 100. For convince of chip flow a 2-30of
inclination angle is recommended. What is the back rake and side rake of this
tool, if principle cutting edges angle is 600?
(b)
Explain
the effect of cutting variables on chip reduction coefficients.
Q3)
(a)
A
tool shape with 60 back rake and 550 side cutting edge
angle has to be used under orthogonal cutting conditions. The cutting forces
are Fz=260kg and Fxy=190 kg. The cutting velocity is
90m/minute Calculate.
(a)
The
necessary side rake angle so that cutting is orthogonal
(b)
The
kinetic coefficient of friction
(c)
Energy
consumed in friction per unit volume of metal removal if the chip reduction coefficient is 2.75.
(d)
Explain
the construction and working of four component strain gauge type drill
dynamometer.
Q4)
(a)
Derive
an expression for thrust force at the chisel edge zone of a twist drill.
(b)
Estimate
the cutting components of the machining force during the orthogonal machining
of an aluminium alloy with an uncut thickness of 0.15mm, width of cut being 2.5 mm.
Q5)
(a)
What
are the various heating teachniques in hot working process? Discuss the advantages and disadvantages over each other.
(b)
Explain
the term “Form Stability” at low cutting speed.
Q6)
(a)
Explain
the mechanism of tool wear during machining process. Compare the wear characteristics of conventional cutting
tool materials.
(b)
What
do you mean by the economics of metal cutting ? Derive an expression for optimum cutting speed for maximum production
rate. Assume suitable assumptions.
Q7)
(a)
Derive
an expression for maximum grit chip thickness during grinding process.
(b)
Explain
the effect of temperature during grinding process.
Q8) Write short note on the followings:
(a)
Diffusive
wear model
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