SPPU Mechanical Engineering (Semester 3)
Manufacturing Process 1
December 2013
Total marks: --
Total time: --
(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 Q1 and Q2
1 (a) Give the classification of forging and Explain open die forging.
6 M
1 (b) In casting experiments performed using a certain alloy and type of sand mold, it took.
155 sec for a cube-shaped casting to solidify. The cube was 50 mm on a Side.
i) Determine the value of the mold constant in Chvorinov's Rule.
ii) If the same alloy and mold type were used, find the total solidification time for a cylindrical casting in which the diameter D = 30 mm and length L = 50 mm.
6 M

2 (a) Explain in brief permeability test for moulding sand.
6 M
2 (b) Differentiate between direct and indirect extrusion.
3 M
2 (c) Calculate the drawing load required to obtain 30% reduction in area on a 12mm diameter copper wire. The following data is given:
6o=240 N/mm2, 2α=12° and u=0.10.
3 M

Solve any one question from Q3 and Q4
3 (a) Explain various types of flame used in gas welding.
6 M
3 (b) Write short note on transfer modelling and blow molding.
6 M

4 (a) Explain in brief thermoforming process.
6 M
4 (b) Explain the plasma arc welding in detail.
6 M

Solve any one question from Q5 and Q6
5 (a) Write short note on progressive die and combination die.
6 M
5 (b) A cup 5cm in a diameter & 7.5 cm deep is to be drawn from 1.5mm thick drawing sheet with a tensile strength of 315N/mm 2 the corner radius is negligible determine:
i) Blank diameter.
ii) Number of drawing operation.
iii) Force and energy for the first draw with 40% reduction.
7 M

6 (a) Define spring back and explain how allowances may be made to compensate for its harmful effect.
3 M
6 (b) Write a short note on strip layout.
3 M
6 (c) Find the centre of pressure for given fig.

7 M

Solve any one question from Q7 and Q8
7 (a) Calculate the gears and sketch the gear train for cutting 1.5mm pitch. It has double start right hand treads on a lathe 6mm pitch of lead screw. Available gears are 20 teeth to 120 teeth in steps of 5 teeth.
7 M
7 (b) Explain the following operation with the sketch (any three):
i) Chamfering.
ii) Knurling.
iii) Grooving.
iv) Threading.
6 M

8 (a) Why chucks are used? List various type of chucks and explain any one.
6 M
8 (b) Calculate the machining time for following given date:
Diameter, D = 100mm
Cutting Speed, V = 50 meter per minute
Length of workpiece, L = 400mm
Feed, f = 0.4 mm/rev
4 M
8 (c) Write a short note on apron mechanism.
3 M

More question papers from Manufacturing Process 1