slide19 - Statistical Process Control Is a tool for...

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1 Statistical Process Control ± Is a tool for ± achieving process stability ± improving capability by reducing variability ± Variability can be due to ± chance causes (relatively small) ± assignable causes (generally large compared to background noise) 2 Control Charts ± UCL = µ W + k σ W ± CL = µ W ± LCL = µ W –k σ W UCL CL LCL Types of Control Charts: •Variables Control Charts • Attributes Control Charts
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3 Purpose of Control Charts ± Improving productivity ± Preventing defects ± Preventing unnecessary process adjustments ± Providing diagnostic information ± Providing information about process capability 4 Design of a Control Chart ± An control chart: ± Standard deviation of the sample average. ± Choosing the control limits. ± Relationship to hypothesis testing. ± Decisions: ± Sample size to use. ± Frequency of sampling. X
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5 ± In manufacturing automobile engine piston rings, the inside diameter of the rings is a critical quality characteristic. Given the process
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slide19 - Statistical Process Control Is a tool for...

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