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I.3 Philosophy and History

I.3 Philosophy and History. Some Goals of Manufacturing Various Paradigms Some Aspects of Taguchi’s Philosophy On-Line and Off-Line Quality Control Design Aspects. Some Goals The Quality Timeline. Paradigms The Inspection Paradigm. Inspect Output To Remove Unsatisfactory Product.

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I.3 Philosophy and History

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  1. I.3 Philosophy and History • Some Goals of Manufacturing • Various Paradigms • Some Aspects of Taguchi’s Philosophy • On-Line and Off-Line Quality Control • Design Aspects

  2. Some GoalsThe Quality Timeline

  3. ParadigmsThe Inspection Paradigm • Inspect Output To RemoveUnsatisfactory Product

  4. ParadigmsShewhart’s Paradigm • “Can’t Inspect Quality Into A Product” • Detect And Correct Quality Problems By Monitoring The Manufacturing Process • Two Types Of Variation In A Manufacturing Process

  5. ParadigmsShewhart’s Paradigm - Terminology • Shewhart: Assignable Cause Variation (ACV) and Chance Causes Of Variation (CCV) • Deming: ACV=Local Faults, Special Causes, CCV=Common Cause Variation • Juran: ACV=Sporadic Problems CCV=Chronic Problems

  6. ParadigmsShewhart’s ParadigmObjective • Monitor The Process To Detect When ACV Is Present. • How Do You Detect ACV? Control Charts

  7. ParadigmsShewhart’s ParadigmTwo Ways To Improve Quality • Eliminate Assignable Causes To Bring Process Into Statistical Control • Improve The System By Reducing Common Cause Variation

  8. ParadigmsTweaking The Variation Paradigm:The Variation/Complexity Paradigm

  9. ParadigmsThe Variation/Complexity Paradigm • Paraphrase Deming - “Reduce Variation And Complexity And You Improve Quality”

  10. ParadigmsDeming and Juran • Originally Found That 80 to 85% Of The Quality Problems Required Management’s Input In Order To Correct. • Over The Years This Percentage Increased To Where They Found That 94 to 96% Of Quality Problems Were Systemic!

  11. ParadigmsDeming And Juran’s Extension • Need Management’s Involvement

  12. ParadigmsDeming and Taguchi • Customer Satisfaction is the Determining Factor in Product Design • Taguchi - Quality is measured in terms of loss to society • -Wring Out the Variation • Deming and Juran - Controlling the Process (On-Line QC) • Taguchi - Design Robust (Rugged) Processes and Products (Off-Line QC)

  13. ParadigmsTaguchi - Another Way To Improve Quality • Build Rugged/Robust Products And Processes By Making Things Insensitive To Unknown Or Uncontrollable Sources Of Variation

  14. Some Aspects of Taguchi’s PhilosophyPrevention Rather Than Detection • Rather Than Detecting Defects, Let’s Design Quality Into The Product Right From The Beginning. “An Ounce of Prevention...”

  15. Some AspectsTaguchi’s Approach • During the 50’s and 60’s Developed A Philosophy and Methodology Concerning Product Design and Production

  16. Some AspectsDesign Aspects of Taguchi’s Philosophy • Robust Products And Processes Through “Engineering Design” (Statistical Design Of Experiments, DOE, Plays A Role Here) • Parameter Design • Choose Parameter (Factor) Levels To • Optimize Process or Product Performance • Mitigate Uncontrollable Factors

  17. Some AspectsDesign Aspects of Taguchi’s Philosophy:Factors • Control Factors • “Easily” controlled sources of variation • Noise • Uncontrollable • External - Environmental Goal - Design Product to Be Insensitive to Noise Factors

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