In a rolling mill, the rollers can exert a pressure of 219 MPa on the sheet being rolled. If the friction coefficient between the roller and the sheet metal is 0.35 and the flow stress of the steel being rolled is 120 MPa, what diameter rolls would reduce the thickness of 2mm thick sheet by 25% in a single pass?

In a slab rolling operation, the maximum thickness reduction (del hmax) is given by del hmax = μ²R, where R is the radius of the roll and u is the coefficient of friction between the roll and the sheet. If µ = 0.1, find the maximum angle subtended by the deformation zone at the centre of the roll.

A compound die will be used to blank and punch a large rectangle (90x150mm blank dimensions) out of 6061ST aluminum alloy sheet stock 3.5 mm thick. The diameter of inside hole is 25 mm. The aluminum sheet metal has a tensile strength 310 MPa. Determine the minimum tonnage press (force) to perform the blanking and punching operation (1) assume that blanking and punching occur simultaneously and (2) assume that punching occurs first, then blanking, Take: Ac-0.06

Q1/ A two-high rolling mill is used to reduce plate that is 450 mm wide and 45 mm thick in a single pass to a thickness of 30 mm. The roll has a radius = 500 mm, and its speed = 25 m/min. The work material has a strength coefficient = 300 MPa and a strain hardening exponent = 0.15. Determine: Roll force 8,519,975.11 N 8,619,975.11 N none of the mentioned 8,419,975.11 N