lec12 - FST 109/K.L McCarthy FST 109 Lecture 12 Statistical...

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FST 109/K.L. McCarthy L12-1 FST 109: Lecture 12 Statistical Process Control (SPC) and Quality Innovators Important terms ± Quality control – The everyday activities that sustain a quality of product or service in order to satisfy given needs ± Quality assurance – Management activities focused on providing confidence that quality requirements will be met ± Variability – Products and/or services are not identical, there is variation – Statistical tools are available to quantify and control variability
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FST 109/K.L. McCarthy L12-2 Program: Statistical Process Control (SPC) ± A set of statistical and management tools that causes processes to function in a more predicable and profitable manner – less waste means fewer raw materials – faster throughput with more quickly repaired machines ± SPC enhances process stability – indirectly improves product quality Statistical Process Control (SPC) ± SPC is a framework of ideas – Objective is to improve the process using statistical tools ± SPC has 5 parts ± SPC incorporates 7 statistical tools
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FST 109/K.L. McCarthy L12-3 SPC is developed based on the concept of variation, Who developed? ± Quality innovator: Walter Shewhart – Worked at Bell Telephone Laboratories in the 1920’s (longtime research and development arm of the American Telephone and Telegraph Company (AT&T) ) ± Originated the concept of “control” as applied to variation – Considered “ founder of statistical quality control ± Wrote “Statistical Method from the Viewpoint of Quality Control” (1939) (Wheeler and Chambers, 1992) 1891-1967 Who developed a mechanism for management? ± W. Edwards Deming – Worked with W. Shewhart – Trained as a statistician, his expertise was used during WW II to assist the United States in its effort to improve the quality of war materials – He was invited to Japan at the end of World War II by Japanese industrial leaders and engineers ± Deming Prize - bestowed on organizations that apply and achieve stringent quality- performance criteria (Wheeler and Chambers, 1992) 1900-1993
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FST 109/K.L. McCarthy L12-4 Deming’s focus: Retrain management If you can't describe what you are doing as a process, you don't know what you're doing. It is not enough to do your best; you must know what to do, and then do your best. Profit in business comes from repeat customers, customers that boast about your project or service, and that bring friends with them. http://www.brainyquote.com/quotes/authors/w/w_edwards_deming.html Fabricate Pack Ship Plan Do Check Act To PDCA cycle Statistical Process Control (SPC) has five parts ± Measurements – measure select key characteristics: process and product ± Calculations – summarize and clarify the meaning of the measurements ± Control charts – Primary tool to access process stability ± Trend rules – used to enhance the sensitivity of the control chart ± Response plans – a plan to quickly correct an unstable process
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FST 109/K.L. McCarthy L12-5 7 Statistical Tools for SPC 1. Fishbone diagram 2. Flow chart 3. Pareto Chart 4. Trend charts
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This note was uploaded on 02/21/2009 for the course FST 109 taught by Professor Kathrynl.mccarthy during the Spring '08 term at UC Davis.

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lec12 - FST 109/K.L McCarthy FST 109 Lecture 12 Statistical...

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