Question
A strip of thickness 40 mm is to be rolled to a thickness of 20 mm using a two-high mill having rolls of diameter 200 mm. Coefficient of friction and arc length in mm, respectively are
Options :
0.45 and 38.84
0.39 and 38.84
0.39 and 44.72
0.45 and 44.72
Answer :
0.45 and 44.72
Solution :
Given, hi = 40 mm, hf = 20 mm, D = 200 mm
Δh = hi - hf
Δh = 20 mm
Projected length,
⇒ L = 44.7213 mm
∵ Δh = μ2R
∴ μ = 0.4472
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