An annealed copper strip 228 mm wide and 25
mm thick is rolled to a thickness of 20 mm in one
pass. The contact length is 38.7 mm and the true
average stress is 180 MPa. The roll radius is 300
mm, and rotates at 100 rpm. Calculate
(a) The draft
(b) The reduction
(c) The coefficient of friction
(d) The roll force
(e) The power required in this operation.