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Discussion

The maximum possible draft in cold rolling of sheet increases with the

  • A.Increase in coefficient of friction
  • B.Decrease in coefficient of friction
  • C.Decrease in roll radius
  • D.Decrease in roll velocity

Answer: A

The main objective in rolling is to decrease the thickness of the metal.
The relation for the rolling is given by, F = µPr
Where; F = tangential frictional force
µ = Coefficient of friction
Pr= Normal force between the roll and work piece
Now, from the increase in µ the draft in cold rolling of sheet increases.

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