STUPIDSID
1 (a)
Compare Hot working and Cold working processes.
8 M
1 (b)
A Copper wire has a nominal breaking strength of 300MPa. Its ductility is 77% reduction of area. Calculate the true stress for fracture.
5 M
1 (c)
Derive the equation for principle stresses.
7 M
2 (a)
Discuss the effect of i) Friction ii) Lubrication on metal working process.
8 M
2 (b)
Write a note on
i) Deformation zone geometry ii) Workability of materials iii) Residual stress in wrought products.
i) Deformation zone geometry ii) Workability of materials iii) Residual stress in wrought products.
12 M
3 (a)
Classify and explain the various forging process, with neat sketches.
8 M
3 (b)
A circular bar of 150 mm diameter and 100 mm height is forged at room temperature between two flat dies to 25 mm height. Determine the yield strength, average die pressure , as well as maximum die pressures at the beginning of plastic deformation and at the end of compression. The yield strngth of the material is given as σ=100.0(0.0085+ε)0.39 N/mm2 and /mu=0.1.
12 M
4 (a)
Explain the commonly used rolling mill arrangements in today's manufacturing industry
10 M
4 (b)
A roll mill has roll diameter of 850mm. Calculate the maximum reduction possible in this mill if the coefficient of friction is 0.3. Determine the rolling load required to obtained 25% reduction of a metal strip of 35mm thickness using the same rolling mill, given the average yield strength of the metal as 180 Mpa and strip width as 690mm.
10 M
5 (a)
Discuss redundant work and its estimation in drawing
10 M
5 (b)
List and explain a few important process variables that affect the drawing force in wire drawing process.
6 M
5 (c)
Explain tube drawing with a floating mandrel.
4 M
6 (a)
Explain the sketches : i) Indirect extrusion ii) Hydro static Extrusion.
8 M
6 (b)
Write a note on extrusion dies
4 M
6 (c)
It is required to extrude an Aluminium alloy at 380°C through square dies from 140mm to 50mm diameter. The ram speed is 40mm/sec and the flow stress of the material at 380°C is 240 Mpa. Determine the extrusion force with the following data. Length of the billet is 450mm; semi-die angle is 45°; Coefficient of friction between work surface is 0.15.
8 M
7 (a)
Explain the types of multi operation dies, with neat sketch
12 M
7 (b)
Calculate the maximum punch force and the work done required to blank a steel washer 44.45mm outside diameter and 22.3mm inside diameter from a 1.59mm thick rectangular sheet with an ultimate shear of 432N/mm2>/sup> and the % penetration is 20%.
8 M
8 (a)
Discuss any 3 methods od production of powders.
6 M
8 (b)
List the advantage and disadvantage of HERF.
8 M
8 (c)
Explain: i) Electromagnetic forming ii) Hot Isostatic Pressing.
6 M
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