f12-6324+HW_2+solution-1

# f12-6324+HW_2+solution-1 - Fundamentals of Production...

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Fundamentals of Production Engineering Page 1 of 6 EML 6324 Fall 2012 Homework #2 Gainesville Students: Due 8:30 a.m. Friday 14 September 2012 EDGE Students: Due before viewing Lecture 9 Upload to Sakai as pdf. (Gainesville students may give in class.) 1. A rolling operation is to reduce a 4 foot wide sheet of 7 gage (0.1793” thick) steel to 10 gage (0.1345” thick) in a single pass. Thickness before: Thickness after: Draft: Width of the workpiece: a. What is the minimum roll diameter if you assume the coefficient of friction is 0.15? Equation 3.6 (pg. 133): b. Double that roll diameter to allow for some margin of safety. (Note: Use this value for the rest of Problem #1.) c. If the yield strength of the material is 30,000 psi, what is the force on the roll in short tons? Yield strength: Assume coefficient accounting for effect of friction on rolling pressure: Equation 3.7 (pg. 134): Equation 3.8 (pg. 134): Equation 3.9 (pg. 134): d. What is the torque (lbs-in) on each roll? Equation 3.11 (pg. 134):

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