150 mm thick and 600 mm wide slab will be reduced to 75 mm thickness in a closed pass rolling operation. a) If the coefficient of friction is 0.5, find the roll diameter necessary to conduct the process. [7 pts] b) Find the maximum bite angle to conduct the process. [7 pts] c) Find the speed of the slab after it exits the rolls, if the entrance speed is 1.5 m/s? [6 pts] 5. In an open die forging operation, a starting billet with a cylindrical shape is going to be used. The diameter and the height of the billet are 100 mm and 150 mm, respectively. The coefficient of friction between the billet and the die surface is estimated as 0.5. Assuming a non-ideal (non-homogeneous) deformation, can the billet be forged if the maximum capacity of the press is; a) 10 tonnes? [5 pts] b) 50 tonnes? [5 pts] c) 100 tonnes? [5 pts] Note: Oyield and UTS of the billet material is 25 MPa and 100 MPa, respectively. Reminder: USE PROPER UNITS (LACK OF UNITS = LESS POINTS). SHOW YOUR WORK (NO WORK = NO POINTS).