26+QUALITY_THROUGH_DESIGN

26+QUALITY_THROUGH_DESIGN - QUALITY THROUGH DESIGN •...

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Unformatted text preview: QUALITY THROUGH DESIGN • Product quality is a key source of competitive advantage • Decline in U.S. competitiveness has been attributed to poor quality • In U.S. improving quality only meant on-line quality control which involves controlling the manufacturing process (SQC) • Off-line quality control has largely been ignored in the U.S. Offline quality control involves improving quality in product and process development QUALITY ENGINEERING Quality Engineering On-Line QC Information Feedback Diagnosis& Adjustment Prediction & Correction Process Control Off-Line QC Design of experiment s Identify Sources of Variation Design Optimization Product Design Proces s Design TAGUCHI'S METHODS A Japanese quality expert Taguchi's work has affected the understanding of quality all around the world. His work includes both on-line and off-line techniques, but he is most famous for his off-line work in this country. Taguchi made three contributions to off-line TAGUCHI'S QUADTRATIC LOSS FUNCTION • The loss due to lack of quality includes the cost of development and the cost of manufacture, as well as the loss sustained by the customer when the product deviates from his or her requirements. • In most companies, engineering and product specifications are set by what is sometimes called a "goalpost" method. • Tolerances are specified so that there are lower and upper bounds, and any product that falls outside these bounds is Quadratic Loss Function m y Loss Function L(y) Taguchi’s Quadratic Loss function L(y)=k(y-m)2 k= constant y= actual measurement m= nominal (target) value If k and m are known, it is possible to determine how much loss is caused by any value of the product characteristic, y....
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This note was uploaded on 10/25/2011 for the course EIN 4401 taught by Professor Staff during the Fall '08 term at University of Florida.

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26+QUALITY_THROUGH_DESIGN - QUALITY THROUGH DESIGN •...

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