Ajuste preventivo versus ajuste corretivo no controle on-line de processo do n?mero de n?o-conformidades num item inspecionado

• Main Author: Silva, Lenilson Pereira da
• Other Authors: CPF:67159370449
• Format: Others
• Language: Portuguese
• Published: Universidade Federal do Rio Grande do Norte 2015
• Subjects: Controle on-line de processo por atributos; n?mero de n?o-conformidades do item inspecionado; cadeia de Markov; Markov Chain; on-line control for attributes; number of non-conformities; CNPQ::CIENCIAS EXATAS E DA TERRA::MATEMATICA::MATEMATICA APLICADA
• Online Access: http://repositorio.ufrn.br:8080/jspui/handle/123456789/18637

Made available in DSpace on 2015-03-03T15:28:32Z (GMT). No. of bitstreams: 1 LenilsonPS_DISSERT.pdf: 421189 bytes, checksum: 22f993fe2b8033189672f2dec900232c (MD5) Previous issue date: 2010-06-15 === In production lines, the entire process is bound to unexpected happenings which may cost losing the production quality. Thus, it means losses to the manufacturer. Identify such causes and remove them is the task of the processing management. The on-line control system consists of periodic inspection of every month produced item. Once any of those items is quali ed as not t, it is admitted that a change in the fraction of the items occurred, and then the process is stopped for adjustments. This work is an extension of Quinino & Ho (2010) and has as objective main to make the monitoramento in a process through the control on-line of quality for the number of non-conformities about the inspected item. The strategy of decision to verify if the process is under control, is directly associated to the limits of the graphic control of non-conformities of the process. A policy of preventive adjustments is incorporated in order to enlarge the conforming fraction of the process. With the help of the R software, a sensibility analysis of the proposed model is done showing in which situations it is most interesting to execute the preventive adjustment === Numa linha de produ??o, todo processo est? sujeito a ocorr?ncias de causas que venham a aparecer causando perdas na qualidade do produto e consequentemente preju?zos ao fabricante. Identificar essas causas e remov?-las ? tarefa do respons?vel pelo monitoramento do processo. Este trabalho tem como objetivo principal fazer o monitoramento num processo atrav?s do controle on-line de qualidade por atributos, considerando o n?mero de n?o-conformidades no item inspecionado. A estrat?gia de decis?o para verificar se o processo est? sob controle, est? diretamente associado aos limites de controle do gr?fico de n?o-conformidades do processo. Uma pol?tica de ajustes preventivos ? incorporada com o objetivo de aumentar a fra??o conforme do processo. Com o aux?lio do software R, ? feita uma an?lise de sensibilidade do modelo proposto mostrando em que situa??es ? mais interessante fazer o ajuste preventivo