LECTURE 14

LECTURE 14 - ENGR 4045U Quality Control Lecture 14 1...

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ENGR 4045U Quality Control Lecture 14 1
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Combining SPC and EPC 2
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Example Use assignable cause for the molecular weight measurements, from period t = 60 3
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Example Effect of assignable cause is to increase molecular weight by 25 units, which adds variability to the process (average and standard deviation x-bar=2019, s=30.4 (instead of 2008 and 19.4) After adjustment using integral control: 4
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Example Set point (x) has been adjusted as: 5
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Example Performance is improved where x-bar=1992 and standard deviation = 15.4 When no assignable causes, x-bar = 2001 and standard deviation = 10.35 6
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Example 7 Out-of-control signal
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Example EWMA or Cusum can detect this deviation ( =0.1) at t=70 8
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Example If we detect assignable causes and eliminate at t=70, the x-bar=1998 and standard deviation s=10.8 9
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Experimental Design 10
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Experimental Design Is a test or series of tests where changes are made to the inputs of a process so that we observe and identify corresponding changes in the output response We have controllable and uncontrollable input variables 11
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Objectives Determine which variables are most influential on the response (y) Determine where to set the influential x so that y is near nominal requirement Determine where to set the influential x so that the variability in y is small Determine where to set the influential x so that the effect of the uncontrollable variables z are minimized 12
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Benefits Improved Yield Reduced variability and closer conformance to the nominal Reduced development time Reduced overall costs 13
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LECTURE 14 - ENGR 4045U Quality Control Lecture 14 1...

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