SPPU Mechanical Engineering (Semester 3)
Manufacturing Process 1
December 2015
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) Explain Lost-Wax casting process in detail.
6 M
1 (b) A casting of 50cm ×40cm×10cm size solidifies in 20 min. Find the solidification time for 40cm×30cm×5cm casting under similar condition.
6 M

2 (a) Explain wire drawing process with neat sketch.
6 M
2 (b) Compare Hot working and Cold working process.
6 M

Solve any one question from Q3 and Q4
3 (a) Explain blow moulding with suitable sketch.
6 M
3 (b) Write a short note on extrusion process in making film and cable.
6 M

4 (a) Describe oxyacetylene welding with neat sketch.
6 M
4 (b) Why is coating essential on arc welding electrode?
6 M

Solve any one question from Q5 and Q6
5 (a) Compare blanking and piercing operation.
6 M
5 (b) Determine the material utilisation factor for producing 40 mm dia. circular blank from sheet of 3 mm thickness by considering allowances a=t+0.015*d and b=t. Sequence of blanks show in Fig. 1. Number of blanks = 5.

7 M

6 (a) Find the centre of pressure for the following Fig 2:

7 M
6 (b) Write a short note on progressive, compound and combination dies.
6 M

Solve any one question from Q7 and Q8
7 (a) Draw single point cutting tool, also write down significance of different angles involved in the geometry.
6 M
7 (b) A steel shaft of 75 mm diameter and 250 mm long turned on a lathe. Speed of spindle = 2 m/s, feed=0.25 mm/rev. Find time required for 50 jobs by assuming 2 minutes for handling of each job.
7 M

8 (a) Explain different operations performed
5 M
8 (b) Calculate the machining time required to reduce 60mm diameter shaft to 50 mm diameter for a length of 1500 mm and with depth of cut 2.5 mm for rough cut and 1 for finish cut. Given:
Cutting speed = 30 m/min. Feed = 0.5 mm/rev. Approach length = 5 mm, overall length = 5 mm. Number of passes = 3 (2 rough cut + 1 finish cut).
8 M

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