Lovely Professional University 2012 M.Tech Mechanical Engineering Important for MEC-914 Theory of Metal Cutting conducted in for Mechanical students - Question Paper
Lovely Professional University
(Theory of Metal Cutting)-Course No. MEC-914
Date: 19-02-2012 Section-M2116
Time allowed: 60min. Set-A
1st Sessional Maximum Mark-20
Q1. Explain continuous type of chips with built-up edge formation? Also explain the factors responsible for avoiding the formation of built-up edge? 3
Q2. Explain & calculate the forces on a chip using Merchants circle diagram? 5
Q3. Prove that for the shear strain (y): 3
_ cos a
Y--where a = Rake angle
sin 0 cos (0a)
0 = Shear angle
Q4. Determine:
(i) Shear force and Normal force at shear plane
(ii) Shear stress(xs)
(iii) Kinetic coefficient of friction() &
(iv) Specific energy of metal removed, from the following data 5
Workpiece material C25 steel having chip thickness 0.38 mm, depth of cut 2 mm, cutting speed 160 rpm, feed 0.2 mm/rev., cutting force 150 N, feed force 75 N
Q5. a) Prove that for Theoretical shear strength (10) = , where G= Modulus of rigidity 2
4
b) Explain the Griffiths theory? 2
Lovely Professional University
(Theory of Metal Cutting)-Course No. MEC-914
Date: 22-04-2012 Section-M2116
Time allowed: 60min. Set-A
1st Sessional Maximum Mark-20
Q1. What are the various methods available for measuring the cutting tool temperature? Explain the Tool Work Thermocouple method?
Q2. What are the basic three types of cutting fluids used in metal cutting? Explain the basis for the selection of a specific cutting fluid for a given application. Take the example of turning, milling and grinding, & suggest the type of cutting fluid used?
Q3. (a) What is physical vapor deposition. Explain briefly how is this process categorized?
(b) Explain the comparison between vacuum evaporation & sputtering process?
Q4. What are the various methods suggested for the cutting fluid to reach the chip-tool interface?
Q5. What are the main problems behind the ceramic cutting tool that restricts its use?
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