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Advisor(s)
Abstract(s)
Nos dias que correm, as diversas organizações assumem uma crescente preocupação associada à produção de artigos de qualidade e, por isso, o controlo estatístico de processos ganha maior relevo por permitir a sua monitorização, com o objetivo de estabilizar e otimizar os mesmos, reduzindo o desperdício e, consequentemente, os custos. Este trabalho visou a implementação do controlo estatístico do processo na área Board-onStyles (BOS) numa empresa dedicada à produção de mobiliário, IKEA Industry Portugal, SA., e na qual se pretende criar uma cultura de controlo estatístico de processo, identificando causas de variação especiais e mitigando-as de forma a reduzir a variabilidade do processo (Cp e Cpk igual a 1,33) e produzindo de acordo com as especificações de cliente. Deste modo, iniciou-se o trabalho com a formação das equipas na temática do controlo estatístico de processos, em especial as cartas de controlo. Definiu-se ainda a humidade do papel como a característica de maior interesse de estudo e, com recurso às cartas de controlo IMR, foi possível o estudo da variabilidade do processo tendo em vista a implementação de medidas corretivas e de melhoria resultantes de várias fontes de variação. Além disso, inferiu-se que os dados recolhidos seguem uma distribuição aproximadamente normal. No que diz respeito ao estudo da capacidade do processo, concluiu-se que este não é capaz de produzir de acordo com os requisitos de cliente, uma vez que os indicadores Cp e Cpk globais são de 0,97 e 0,60, respetivamente, não sendo cumprido o objetivo principal deste trabalho. Não obstante, foi possível evidenciar que as melhorias implementadas resultaram numa menor variabilidade e, consequentemente, a qualidade dos produtos melhorou, tendo-se determinado um decréscimo de 12,21% de material não conforme ao longo do trabalho.
Nowadays, organizations assume a growing concern when it comes to product’s quality and, therefore, the statistical process control is of great importance once it allows the monitoring of processes with the objective of stabilizing and optimizing them, reducing waste and, consequently, costs. This project aims the implementation of statistical process control in the Board-on-Styles (BOS) line in a company dedicated to furniture production, IKEA Industry Portugal, SA., and in which the main goal is to create statistical process control culture by identifying special causes of variation and mitigating them, in order to reduce process variability and producing according to customer specifications. Therefore, the project began with the training of the team on statistical process control, in particular control charts. Paper moisture was also defined as the characteristic of greatest interest to this study and, by applying I-MR control charts, it was possible to evaluate the variability of the process, aiming the implementation of corrective and improvement measures that can result from various sources of variation. Furthermore, it was possible to infer that the data collected follows an approximately normal distribution. With regard to the process capability, it was concluded that the process is not capable of producing according to customer requirements since the global process indicators Cp and Cpk are 0,97 and 0,60, respectively, and, consequently, the main goal was not fully fulfilled. Nevertheless, it was visible that the improvement action implemented resulted in less variability of the process and the quality of the products has improved, as there was a decrease of 12,21% of non-conforming products during this project.
Nowadays, organizations assume a growing concern when it comes to product’s quality and, therefore, the statistical process control is of great importance once it allows the monitoring of processes with the objective of stabilizing and optimizing them, reducing waste and, consequently, costs. This project aims the implementation of statistical process control in the Board-on-Styles (BOS) line in a company dedicated to furniture production, IKEA Industry Portugal, SA., and in which the main goal is to create statistical process control culture by identifying special causes of variation and mitigating them, in order to reduce process variability and producing according to customer specifications. Therefore, the project began with the training of the team on statistical process control, in particular control charts. Paper moisture was also defined as the characteristic of greatest interest to this study and, by applying I-MR control charts, it was possible to evaluate the variability of the process, aiming the implementation of corrective and improvement measures that can result from various sources of variation. Furthermore, it was possible to infer that the data collected follows an approximately normal distribution. With regard to the process capability, it was concluded that the process is not capable of producing according to customer requirements since the global process indicators Cp and Cpk are 0,97 and 0,60, respectively, and, consequently, the main goal was not fully fulfilled. Nevertheless, it was visible that the improvement action implemented resulted in less variability of the process and the quality of the products has improved, as there was a decrease of 12,21% of non-conforming products during this project.
Description
Keywords
Qualidade Controlo Estatístico do Processo Cartas de Controlo Capacidade do Processo Indústria de Mobiliário Quality Statistical Process Control Control Charts Process Capability Furniture Industry