Total No. of Questions : 6] SEAT No.

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P511 [Total No. of Pages : 2
APR - 18/TE/Insem. - 110

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T.E. (Mechanical)

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MANUFACTURING PROCESS - II

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(2015 Pattern) (Semester - II)

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Time : 1 Hour] .23 01 [Max. Marks : 30
Instructions to the candidates:
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1) Solve Q1 or Q2, Q3 or Q4, Q5 or Q6.
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2) Figures to the right indicate full marks.

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3) Use of electronic pocket calculator is allowed.

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4) Assume suitable data, if necessary.

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Q1) a) Derive an expression for shear angle with chip thickness ratio. [6]

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b) A seamless tube of 50 mm outside diameter is turned on lathe with cutting

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speed of 20 m/min. The tool rake angle is 15º and feed rate is 0.2 mm/
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rev. The length of chip in one revolution measures 80 mm. Calculate :
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i) Chip thickness ratio.

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ii) Shear plane angle.

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iii) Shear flow speed.

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iv) Shear strain. [4]

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Q2) a) The following equation for tool life is given for turning operation,
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VT0.13 f0.77 d0.37 = C, 4

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A 70 minute tool life was obtained while cutting at V = 35 m/min,
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f = 0.3 mm/rev and d = 2 mm. Determine the change in tool life if the
cutting speed, feed and depth of cut are increased by 20% individually
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and also taken together. [6]

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b) What is built up edge and how is it formed? What are the conditions that
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lead to formation of built up edge? [4]

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Q3) a) Explain the following with neat sketch. [6]

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i) Spot facing.
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ii) Counter sinking.

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iii) Trepanning.
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b) Explain Thread milling with neat sketch. [4]

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Q4) a) Draw and explain Broach tool geometry. [6]

b) Calculate the time required for drilling a 18 mm diameter hole in 27 mm

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thick plate at a speed of 0.55 m/s and feed of 0.10 mm/rev the point

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angle of the drill is 120º and approach and over travel may be assumed

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to be 6 mm. [4]

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Q5) a) 8 1 30
Explain mounting of grinding wheels with neat sketch. [6]
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b) Write a short note on buffing. [4]
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Q6) a) For rough grinding operation determine the machining time required when

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cutting speed is 30 m/min, diameter of work is 50 mm, depth of cut is

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0.03 mm, stock = 0.7 mm for 222 mm long work piece, width face of the
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wheel is 70 mm. [6]
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b) What do you mean by Loading and Glazing of grinding wheel? [4]
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TE/Insem. - 110 2