B.E. 3/4 (Mech.) II Semester (Suppl.) Examination, December 2012 Subject: Metal Cutting & Machine Tool Engineering Time: 3 Hours
Max.Marks: 75
Note : Answer all questions from Part A. Answer any Five questions from Part B. PART – A (10x2.5 = 25 Marks) 1. Why diamond cutting tool is not used for machining of carbon steels? 2. Sketch merchant’s circle, indicate all forces and angles. 3. Define tool wear. What is the reason for tool failure? 4. What are sources of heat and heat distribution in metal cutting? 5. List various operations performed on lathe machine. 6. What do you understand by centerless grinding? 7. Differentiate between gear shaping and gear shaving. 8. Briefly explain the principle of broaching. 9. Enlist various quick clamping devices used in jigs and fixtures. 10. Briefly explain the principle and application of ECM. PART – B (5x10 = 50 Marks) 11.(a) Derive the shear angle solution according to Lee and Shafer.
(10)
(b) The following data were observed during an orthogonal cutting operation: Cutting force = 1600 N, feed force = 850 N, Chip thickness ratio = 0.26 Tool rake angle = 10o, Calculate (i) shear angle ( ) (ii) Shear force (iii) Coefficient of friction (μ). 12.(a) Define tool life. What are the factors affecting tool life?
(5)
(b) Explain the types and applications of cutting fluids.
(5)
13.(a) Explain the hydraulic quick return mechanism used in shaper.
(5)
(b) How the grinding wheel is specified? Explain about types of abrasives and bonds. (5) 14.(a) Differentiate between horizontal and vertical jig boring machines.
(5)
(b) Explain the thread rolling process with help of a neat sketch.
(5)
15.(a) Explain the 3-2-1 principle of clamping with help of neat sketch.
(5)
(b) Explain the working principle and applications of LBM. 16.(a) Explain tool geometry of a single point cutting tool as per ASA system. (b) Define machinability. How metals are rated? 17.
Write short notes on the following: (a) Indexing methods (b) Types of chips (c) EBM and EDM.
Page 1 of 2. Code No. 2342 / N. FACULTY OF ENGINEERING. B.E. 3/4 (Mechanical) I â Semester (New) (Main) Examination, Nov. / Dec. 2012. Subject : Applied Thermodynamics. Time : 3 hours Max. Marks : 75. Note: Answer all questions from PartâA and an
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