chp17 - Statistics in Quality Assurance Statistical Process...

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Statistical Process Control FScN 4131 Food Quality November 20, 2000 Statistics in Quality Assurance Three major areas: • Experimental Design - R&D and troubleshooting • Sampling - Inspection and testing – Statistical distributions •P ro c e s s Con t l – Control charts Statistical Process Control Definition: • Method of monitoring a process during its operation in order to control the quality of the products while they are being produced -- rather than relying on inspection to find problems after the fact. Purpose: • Identify causes of variation Statistical Process Control Steps 1. Design control charts 2. Determine process capability 3. Interpretation of control charts Statistical Process Control: Process Capability • Process: steps, operations or changes leading to a particular result • Capability: capacity for an indicated use • Process capability: the level of uniformity of product which a process is capable of yielding Statistical Process Control: Process Capability Purpose of Process Capability studies: “Determine the best quality a process is currently capable of producing so that realistic control limits and specifications can be set”
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Statistical Process Control: Process Capability According to Deming, 2 types of causes of variability: 1. Common 2. Assignable Statistical Process Control: Process Capability Causes of variability: 1. Common - Inherent to the process - Control: change the process - Examples: ?
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This note was uploaded on 01/06/2011 for the course FDE 510 taught by Professor Prof.hamialpas during the Spring '09 term at Middle East Technical University.

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chp17 - Statistics in Quality Assurance Statistical Process...

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