Browsing by Subject "statistical process control (SPC)"

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Access status: Open Access ,
Analysis of Clements' method for capability indices estimation
(2009) Czarski, Andrzej
Statistical methods belong to the basic quality tools. Among statistical instruments the statistical process control SPC takes particular place. One of the principal tasks of SPC is process capability analysis i.e. the assessment of process potential as for variability regarding expectations defined by specification limits. This work concerns the comparative analysis of capability indices determination in case of distribution unlike the normal one.
Access status: Open Access ,
Assessment of statistical stability of steel strip hot-rolling process
(2008) Czarski, Andrzej
Statistical methods belong to the basic quality tools. Among statistical instruments the statistical process control SPC takes particular place. One of the principal tasks of SPC is monitoring of a process by means of control charts. They are first of all Shewhart's control charts. The aim of investigations was to assess stability of technological process of hot-rolling of steel strip. There were available the results of thickness measurements madę with an X-ray thickness gauge as well as measurements of convexity and wedge shape made with a profile measurement gauge. The assessment of statistical process stability was performed by means of Shewarfs control charts technique. In case of thickness the estimation of capability indices Cp, Cpk and Pp, Ppk have been carried out, in addition.
Access status: Open Access ,
Statistical methods in quality management - process capability analysis
(2007) Czarski, Andrzej; Satora, Kazimierz; Matusiewicz, Piotr
Statistical methods belong to the basic quality tools. Among statistical instruments the statistical process control SPC takes particular place. One of the principal tasks of SPC is process capability analysis i.e. the assessment of process potential as for variability regarding expectations defined by specification limits. For capability estimation some indices are used - Cp, Cpk, Pp, Ppk etc. In this work the way of determining and interpreting capability indices Cp, Cpk of so-called first generation in relation to the process of steel forgings production has been presented.