lecture_14_-_dfa_part_2 - ME 350 – Lecture 14 – DFA...

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Unformatted text preview: ME 350 – Lecture 14 – DFA Part 2 • 2 nd Hour Exam - Overview • DFA Part Analysis – “the 3 questions” • Determining Assembly Efficiency • Examples of Improving Part Design • Product Principles • Part Principles DFA Analysis Three questions of DFA Analysis : 1. Does this part have to be a different material ? 2. Does this part move relative to all other parts? 3. Does this part have to be separate (due to function) for other parts to work? “No’s” point out where the opportunities are to combine parts or improve assembly. Determining Assembly Efficiency • DFA Efficiency = – Where NM is the theoretical minimum number of parts, – And, TM is the time to make the product or its total “assembly time” – “Ideal” assembly is roughly 3 seconds per part TM NM 3 Tray Example 3: DFA analysis questions – side panels : 1. Material have to be different? N 2. Moves relative to all other parts? N 3. Does it need to be separate to work? N Side panels NM is “0” Assembly efficiency – Total assembly time = 37.7s + 3s (base) – Efficiency = % 7 . 14 7 . 40 2 3 3 = = TM NM Tray Example 1: DFA analysis questions - handle : 1. Material have to be different? N 2. Moves relative to all other parts? y 3. Does it need to be separate to work? N Handle’s NM is, therefore , “1” Assembly efficiency – Total assembly time = 2.6s + 3.5s (base) – Efficiency = % 3 . 98 1 . 6 2 3 3 = = TM NM Improved Assembly → Enables Automation Parts: 24 8 4 2 Time (s): 100 38 10 3 Re-Design using DFA Original BDI - DFA worksheet Example DFA Analysis – motorcycle lift...
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This note was uploaded on 10/03/2011 for the course ME 350 taught by Professor Staff during the Spring '08 term at University of Illinois, Urbana Champaign.

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lecture_14_-_dfa_part_2 - ME 350 – Lecture 14 – DFA...

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