文档介绍：Operations Management
Supplement 6 –Statistical Process Control
© 2006 Prentice Hall, Inc.
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Principles of Operations Management, 6e
Operations Management, 8e
Outline
Statistical Process Control (SPC)
Control Charts for Variables
The Central Limit Theorem
Setting Mean Chart Limits (x-Charts)
Setting Range Chart Limits (R-Charts)
Using Mean and Range Charts
Control Charts for Attributes
Managerial Issues and Control Charts
Outline – Continued
Process Capability
Process Capability Ratio (Cp)
Process Capability Index (Cpk )
Acceptance Sampling
Operating Characteristic Curve
Average Outgoing Quality
Learning Objectives
When plete this supplement, you should be able to:
Identify or Define:
Natural and assignable causes of variation
Central limit theorem
Attribute and variable inspection
Process control
x-charts and R-charts
Learning Objectives
When plete this supplement, you should be able to:
Identify or Define:
LCL and UCL
P-charts and c-charts
Cp and Cpk
Acceptance sampling
OC curve
Learning Objectives
When plete this supplement, you should be able to:
Identify or Define:
AQL and LTPD
AOQ
Producer’s and consumer’s risk
Learning Objectives
When plete this supplement, you should be able to:
Describe or Explain:
The role of statistical quality control
Variability is inherent in every process
Natural mon causes
Special or assignable causes
Provides a statistical signal when assignable causes are present
Detect and eliminate assignable causes of variation
Statistical Process Control (SPC)
Natural Variations
Also mon causes
Affect virtually all production processes
Expected amount of variation
Output measures follow a probability distribution
For any distribution there is a measure of central tendency and dispersion
If the distribution of outputs falls within acceptable limits, the process is said to be “in control”
Assignable Variations
Also called special causes of variation
Generally this is some ch