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Question

In a slab rolling operation, the maximum thickness reduction (Δhmax) is given by Δhmax=μ2R, where R is the radius of the roll and μ is the coefficient of friction between the roll and the sheet. If μ=0.1, the maximum angle subtended by the deformation zone at the centre of the roll (bite angle in degree) is____.
  1. 5.73

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Solution

The correct option is A 5.73
Δhmax=μ2R

Δh=D(1cosα)

μ2R=D(1cosα)

(0.1)2=2(1cosα)

or α=5.73

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