SPC教材.ppt39

Statistical Process Control
Evolution from Inspection to SPC
Statistical  Process Control Topics
Introduction to Variability
Control Charts
x-bar Charts, R Charts
p Charts, np Charts
Type 1 and Type 2 Errors
Process Capability Analysis
Variation
Analyze and Act: React to Assignable Causes
Note unusual variation diagnosed by using a common test to evaluate individual data points
Identify cause by noting what change in the process occurred at that point in time
Eliminate cause or build in the cause
Monitor performance to verify the effect of the “fix”
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