PLURA Jiří VŠB -Technická univerzita

Spoluautoři ZEMEK Milan, KLAPUT Pavel

Process capability analyses, which characterize processes ability to produce products meeting quality criteria, are now a standard part of products and processes quality planning and improvement. Automotive industry considerably contributes to their wide application, because its suppliers must demonstrate the capability of their processes. Standard process capability analysis procedure applies number of assumptions. One of them is the assumption of normal distribution of given quality characteristic that in real conditions may not be met. The article deals with possible causes of not meeting of this assumption and highlights the fact that in many cases it may not be related to the nature of the quality characteristic distribution. For situations where non-normality is the natural behavior of the product quality characteristic they are analyzed various approaches that makes possible to evaluate the process capability. In a concrete example the results of application of selected approaches are compared and discussed.