Low carbon steel plate that is 1.65 inches thick is to be rolled down to 1.3 inches in a single pass. The plate gets 4% wider as the thickness gets smaller. The steel plate has a 174 MPa yield strength and a 290 MPa tensile strength. The plate enters at a pace of 0.6 inches per minute. The rotating speed is 49.0 rev/min, and the roll radius is 12.8 inches. Calculate: a) Determine the minimum required coefficient of friction that would make this rolling operation possible b) exit velocity of the plate (m/min) c) forward slip (m/min) Please submit the final answers in 2 decimal places

A hot/cold rolling setup is shown right. The operation first hot rolls a 3/8” thick plate, 12” wide (w), of6061 Aluminum, to an intermediate thickness, then finally through cold rolling, down to 1/4” thick plate.The friction factor μ is assumed to be constant at 0.15 for the hot roll, 0.12 for the cold rolling stage. Thefirst set of rolls operate at 50 RPM. Also ignore any width increase during rolling. CW=13% or .13   What is the plate thickness (mm) prior to the last rolls, t1, if the last set of rollers perform cold work reduction listed below at .13 or 13% Note that 9.52 mm is equal to 3/8 of an inch.

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Question 3 A rolling operation on a 250 mm wide, 8 mm thick, 1112 cold rolled steel takes place using hardened steel rolls with a surface finish of 0.03 um. The rolls have a diameter of 350 mm and rotates at 115 rpm. The final thickness of the plate is 6 mm and the entry speed of the plate is 1.8 m/s. Calculate: 3.1 The minimum coefficient of friction required, that will make the rolling operation possible. 3.2 The required roll force. 3.3 The position of the neutral point, xn 3.4 Indicate, using a sketch, the neutral point showing all relevant notation and dimensions.

03: A 42.0 mm-thick plate made of low carbon steel is to be reduced to 34.0 mm in one pass in a rolling operation. As the thickness is reduced, the plate widens by 4%. The yield strength of the steel plate is 174 MPa and the tensile strength is 290 MPa. The entrance speed of the plate is 15.0 m/min. The roll radius is 250 mm and rotational speed is 49.0 rev/min. Determine: 1. Minimum required coefficient of friction that would make this rolling operation possible. 2. Exit velocity of the plate. 04: A metal has a flow curve with strength coefficient is 850 MPa and strain- hardening exponent is 0.30. A tensile specimen of the metal with gauge length of 100 mm is stretched to a length of 157 mm. Determine the flow stress at the new length and the average flow stress that the metal has been subjected to during 3. Forward slip. the deformation. 05: A plate that is 250 mm wide and 25 mm thick is to be reduced in a single pass in a two-high rolling mill to a thickness of 20 mm. the roll has a…

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0.075L T 0.8 4.0 -7.0 + All dimensions in inches -2.0- 0.1 T 0.205 0.25 T 0.25 5) Rolling: A rolling operation is performed on a 5 mm thick sheet of low carbon steel (K=530, n=0.26 from Table 8.1). The sheet is reduced by 0.2 mm each pass. The friction at the dies is 0.3. The roller diameters are 50 mm. The sheet width is 125 mm. a) Find the roll force for the 3rd pass. For the 3rd pass the initial thickness is 4.6 mm and the final thickness is 4.4 mm. a) Estimate the power to perform the 3rd pass if the roll rotates at 100 rpm.

2) Drawing: A round rod of annealed 302 stainless steel (K = 1300 MPa and n = 0.3) is being drawn from a diameter of 15 mm to a diameter of 12 mm at a speed 0.25 m/s, using a semidie angle of 8º. a. Calculate the percentage reduction, the applied force due to ideal deformation, friction, and inhomogeneous deformation. Assume coefficient of friction of 0.1. b. Calculate the required power, process efficiency, and the die pressure at the exit.

Note** take Y value as Y=330MPa

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