Materials Science and Manufacturing Engineering Miscellaneous
- In forging operation the sticking friction condition occurs near the... (centre/ends)
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At the centre, because of maximum pressure at the centre.
Correct Option: B
At the centre, because of maximum pressure at the centre.
- In a rolling process, the state of stress of the material undergoing deformation is
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Compression & Shear
Correct Option: C
Compression & Shear
- The thickness of a plate is reduced from 30 mm to 10 mm by successive cold rolling passes using identical rolls of diameter 600 mm. Assume that there is no change in width. If the coefficient of friction between the rolls and the workpiece is 0.1, the minimum number of passes required is
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hi = 30 mm µ = 0.1 D = 60 mm
hf = 10 mm R = 300 mm
Δh = 20 mm
Draft of single pass
(Δh)1 = µ2 = (0.11)2 × 300No = passes = 20 = 6.67 ≃ 7 passes. 3 Correct Option: D
hi = 30 mm µ = 0.1 D = 60 mm
hf = 10 mm R = 300 mm
Δh = 20 mm
Draft of single pass
(Δh)1 = µ2 = (0.11)2 × 300No = passes = 20 = 6.67 ≃ 7 passes. 3
- In a rolling process, the roll separating force can be decreased by
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As roll diameter decreases for the same reduction the contact length decreases. So less force will be required.
Correct Option: A
As roll diameter decreases for the same reduction the contact length decreases. So less force will be required.
- Anisotropy in rolled components is caused by
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When a material having different value of property in different Direction, called as anisotropic material
Correct Option: D
When a material having different value of property in different Direction, called as anisotropic material
