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SPPU Mechanical Engineering (Semester 3)
Manufacturing Process 1
May 2017
Total marks: --
Total time: --
INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary

Solve any one question from Q.1(a,b) &Q.2(a,b)
1(a) What are different allowances applied in pattern making? Explain.
6 M
1(b) With neat sketch explain gating system used in sand casting.
6 M

2(a) A cylindrical riser must be designed for a sand casting mould. The size of steel casting is 40mm×100mm×10mm. The previous obervations have indicated that the total solidification time for casting is 80 sec. The cylindrical riser has (d/n)=1, find the size of riser so that its total solidification time is 120 sec.
6 M
2(b) What is the difference between hot working and cold working?
6 M

Solve any one question from Q.3(a,b) &Q.4(a,b)
3(a) With proper sketch explain Injections Moulding Process
6 M
3(b) Explain Arc welding with merits and demerits.
6 M

4(a) What are different types of flames in gas welding? Explain with proper sketch.
6 M
4(b) Classify the welding process. What are its advantages?
6 M

Solve any one question from Q.5(a,b) &Q.6(a,b)
5(a) A 120 mm diameter hole is to be punched in a sheet of 6 mm thick. The material of the sheet is cold rolled steel with a shear strength of 560MPa. With normal clearance cutting is completed at 30 percent penetration of the punch. Find:
i) Diameter of the punch and die.
ii) Maximum force on the punch,
iii) Stripping force
iv) Total work done in punching. Also estimate the amount of shear on the punch if punching force is 250 kN.
7 M
5(b) What is center of pressure? How is it calculated?
6 M

6(a) What is Compound die? Explain with proper sketch.
6 M
6(b) Explain any two operations performed on sheet metal in detail with proper sketches.
7 M

Solve any one question from Q.7(a,b) &Q.8(a,b)
7(a) With neat sketch explain steady rest and follower rest in lathe machine.
7 M
7(b) Explain threading operation on lathe machine with neat sketch.
6 M

8(a) Calculate machining time for a workpiece of 80mm diameter and 120 mm length turned in 2 passes if the apporach length is 14 mm and over travel is 6 mm. Given cutting speed = 4m/min. And feed is 0.4 mm/rev.
6 M
8(b) Explain Taper turning attachment with neat sketch.
7 M

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