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hw5 - ME363 HW5 1 Fall 2010 Name Due A cylindrical 6060-O...

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ME363 HW5 Fall 2010 Name Due: 11/18/10 1. A cylindrical 6060-O aluminum workpiece with D=1.25 in. and h=2.5 in. is forged to a height of 1.5 in at a velocity of 10 in/sec. The coefficient of friction at the die-workpiece interface is 0.2. (a) Determine the maximum instantaneous force in operation when the process is performed at room temperature. (Use Table on the back page for properties). (b) Determine the maximum instantaneous force in operation when the process is performed at 400ºC. (Use Table on the back page for properties). 2. A rolling process is going to be performed on 1015 steel plate. Review Example 13.1 in the textbook. The width of the plate is 400 mm and initial thickness is 10 mm, which will be reduced to 7 mm in one pass. The roll radius 200 mm and it rotates at 200 rpm. (a) Determine the minimum friction coefficient needed. (b) Determine the roll force and power required, if the process is performed at room temperature. (c) Determine the roll force and power required, if the process is performed at 800 ° C. 3. A continuous hot rolling mill has eight stands.
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