Quality Control Management

A primer on the Taguchi method by Ranjit Roy

By Ranjit Roy

A transparent, basic and primarily non-mathematical presentation, this sensible advisor introduces you to the elemental options, strategies and purposes of the well known Taguchi process. A Primer at the Taguchi strategy introduces the elemental recommendations of Taguchi experimental layout and indicates engineers tips on how to layout, examine, and interpret experiments utilizing the Taguchi technique for a variety of universal items and strategies. Written for production and construction engineers, in addition to layout engineers and executives, this e-book explains the main sensible how one can practice the Taguchi technique. The Taguchi method of caliber: the ability of the Taguchi technique exhibits the way it might be utilized to an array of goods from autos to desktops. study the intense merits of establishing caliber into the layout, the center of the Taguchi approach. various real-world examples may also help you spot how the Taguchi strategy works in a number of production purposes. if you want a extra rigorous statistical remedy, the book's operating appendices offer complete mathematical information on orthogonal arrays, triangular tables and linear graphs, plus absolutely labored suggestions to difficulties provided within the instance case stories.

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TAGUCHI QUALITY STRATEGY Taguchi’s approach to enhance quality in the design phase involves two steps: 1. Optimizing the design of the product/process (system approach). 2. Making the design insensitive to the influence of uncontrollable factors (robustness). When a product is optimum, it performs best under the available operating conditions. Depending on the specified performance, the optimum will imply that the product has achieved the most, the least, or the target value of the quality measure.

Figure 3-1(b) shows the average on-target, but the variation is still excessive. Figure 3-1(c) illustrates the desired characteristic—on target and with narrow variation. COST OF VARIATION Early in his research, Dr. Taguchi observed that unexpected variation was common to all manufacturing processes and that it was the primary cause for rejection of parts. Parts were rejected upon inspection when they did not conform to a predefined specification. Rejection increases the cost of production. Often, 100% inspection is excessively costly or impractical; thus, a defective part may reach a customer and lead to warranty costs and customer dissatisfaction.

The content and outcome of a brainstorming session is largely dependent on the nature of a project and, as such, is a technique learned primarily by experience. Most application specialists consider brainstorming to be the most important element in deriving benefits from the Taguchi method. Taguchi brings a new breadth to planning experimental studies. Experimenters think through the whole process before starting 40 A Primer on the Taguchi Method the tests. This helps to decide which factors are likely to be most important, how many experiments are needed, and how the results would be measured and analyzed—before actually conducting any experiment.

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