Izvorni znanstveni članak
Application of Bernoulli Process-based Charts to Electronic Assembly
Darja Noskievičová
; Department of Quality Management, FMMI, VŠB-TU Ostrava, Ostrava-Poruba, Czech Republic
Eva Jarošová
; Department of Logistics and Quality Management, Škoda Auto University, Mlada Boleslav, Czech Republic
Kateřina Brodecká
; CTS Czech Republic Ltd, Ostrava, Czech Republic
Sažetak
The application of protective gel, which is a subprocess of the electronic assembly of the exhaust gas recirculation sensor, is a highly capable process with the fraction of nonconforming units as low as 200 ppm. Every unit is inspected immediately after gel application. The conventional Shewhart chart is of no use here, and the approach based on the Bernoulli process is therefore considered. The number of conforming items in a row
until the occurrence of first or the r-th nonconforming is determined and CCC-r, CCC-r EWMA, and CCC CUSUM charts are applied. The aim of the control is to detect the process deterioration, and so the one-sided charts are used. So that the charts based on the geometric or negative binomial distribution can be compared, their performance is assessed through the average number of inspected units until a signal (ANOS). Our study confirmed that CCC-r EWMA and CCC CUSUM are able to detect the process shift more quickly than the CCC-r chart. Of the two charts, the first is easier to construct.
Ključne riječi
CCC-r; CCC-CUSUM; CCC-r EWMA; highly capable process; ANOS
Hrčak ID:
142348
URI
Datum izdavanja:
1.1.2015.
Posjeta: 863 *