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HW5

# HW5 - ME363 HW5 1(a(b(c 2(a(a Fall 2011 Name Due A 2.0 inch...

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ME363 HW5 Fall 2011 Name Due: 11/22/2011 1. A 2.0 inch thick slab of low carbon steel is 10 inches wide and 12 feet long. Thickness is to be reduced in three steps in a hot rolling operation through rolls of 30 in. diameter at 900 ° C (C=24,000psi, m=0.08). Each step will reduce the slab to 75% of its previous thickness. It is expected that for this material and reduction the slab will widen by 3% in each step. The entry speed of the slab in the first step is 40 ft/min and roll speed is the same for the three steps. (a) Determine the minimum friction required for this operation. Assume that the friction will be the same for all three steps. (b) Determine the length and exit velocity of the slab after the final reduction. (c) Calculate the maximum force encountered during this operation using the friction coefficient obtained in (a). 2. An upset forging operation is performed in an open die. The initial diameter and height of the round 1100 Aluminum billet are 1.0 inch and 2.0 inches, respectively. The part is upset to a diameter of 2.0 inches at a velocity of 0.5m/s.

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HW5 - ME363 HW5 1(a(b(c 2(a(a Fall 2011 Name Due A 2.0 inch...

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