Test 3_1 - WW “" U"\GL Mechanical Engineering...

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Unformatted text preview: WW “" U" \GL Mechanical Engineering 4283 Term Test 3, November 18, 2010 Manufacturing Engineering II Dr. Andy Simoneau MECHANICAL ENGINEERING 4283 TERM TEST THREE TEST NOTES / INSTRUCTIONS: 1. This is a closed book test /examination. No books, or other documents other than those provided by the instructor/invigilator shall be permitted. . Test booklets are supplied, The use of calculators is permitted, however the use of cell phones, laptops, PDA’s, and/or any other form of electronic communicating devices is not permitted, . Attempt all questions and show all of your work, . It is preferred that you do all of your work in pen. You may do your work in pencil, but this could impact any regrading or reevaluation of your test, . Formula sheet is provided at the end of the test paper. QUESTION 1 Describe three types of chip formation with a diagram. Assuming a positive rake angle, which chip form would probably be best for production purposes, the worst for production purposes, and be the worst for the machine tool over a. long period of time? Explain. QUESTION 2 Mild steel is being machined under the following conditions: Width of out 'w = 2.0mm, Rake angle a: = 10°, Cutting speed V = 200m/min, Uncut chip thickness to = 0.2mm, Coefficient of friction u = 0.5, Shear strength of the material 1‘ = 400N/mm2. a) Determine the shear angle using Merchant’s theory. b) Determine the cutting and thrust force components. Mechanical Engineering 4283 Term Test 3, November 18, 2010 Manufacturing Engineering II Dr. Andy Simoneau QUESTION 3 3.) Describe two types of tool wear, include a drawing. b) What material and cutting conditions do you think would lead to each type of wear? 0) Setting n = 0.5 and C = 400, calculate the percentage increase in tool life when the cutting speed is reduced by 50%. THE END ...
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