Materials Science and Manufacturing Engineering Miscellaneous
Direction: A 10 mm diameter annealed steel wire is drawn through a die at a speed of 0.5 m/s to reduce the diameter by 20%. The yield stress of the material is 800 MPa.
- Neglecting friction and strain hardening, the stress required for drawing (in MPa) is
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Diameter of steel wire
di = 10 mm
v = 0.5 m/sec
Final diameter of wire
df = 0.8 × di = 8 mm
(drawing stress)σd = σyt × ln 
di 
² df = 800 × 2ln 10 = 357 MPa 8
Correct Option: B
Diameter of steel wire
di = 10 mm
v = 0.5 m/sec
Final diameter of wire
df = 0.8 × di = 8 mm
(drawing stress)σd = σyt × ln di ² df = 800 × 2ln 10 = 357 MPa 8
- A round billet made of brass is to be extruded (extrusion constant = 250 MPa) at 700°C. The billet diameter is 100 mm and the diameter of the extrusion is 50 mm. The extrusion force required (in MN) is
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F = K ln (R) Ai.
F = 2.722 MNCorrect Option: B
F = K ln (R) Ai.
F = 2.722 MN
- The extrusion processes used for the production of toothpaste tubes is/are
1. tube extrusion
2. forward extrusion
3. impact extrusion
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Collapsible tube are made by impact extrusion ex. Toothpaste tube, Battery case.
Correct Option: D
Collapsible tube are made by impact extrusion ex. Toothpaste tube, Battery case.
- A moving mandrel is used in
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Tube drawing with moving mandrel.
Correct Option: B
Tube drawing with moving mandrel.
- Forces in hot extrusion is a function of the strain hardening component of the billet material. (T/F)
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Wrong or false
Correct Option: A
Wrong or false
