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Otimização da Testagem de Garrafas Através Melhoria Contínua
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A atividade desenvolvida no site CMD de Arruda dos Vinhos da empresa Air Liquide,
relaciona-se com a tarefa de testagem hidráulica de garrrafas de ar comprimido, conforme
a norma ISO 19016.3. Esta instalação, com funcionamento assente em trabalho de natureza
excessivamente manual, para a realidade industrial observada atualmente, conta com
bastantes ineficiências enraizadas no seu funcionamento, bem como em equipamentos
desatualizados, com funcionalidades importantes em falta, quando comparado com o
disponível comercialmente, pelos fornecedores. Adicionalmente, é patente a ausência de
uma determinação de tempos de produção, bem como de duração de tarefas individuais
para diferentes fatores de variação.
De modo a determinar correlações, significâncias, foram realizados, durante três meses,
observações e medições de tempo de duração das diferentes tarefas. Com os dados
recolhidos, procedeu-se a uma análise estatística da mesma e determinadas as relações
de significância entre diferentes fatores e níveis, com recurso a testes de Kruskal-Wallis e
Fischer. Não existiu a realização de um DoE (Design of Experiments) ou de uma ANOVA
(Analysis of Variance), devido à impossibilidade de alterar o mapa de produção da instalação.
Analisando os dados, é possível concluir que o fator "Volume"é significante em ta-
refas de todas as zonas do processo. Os fatores "Cliente"e "Capacete"são significantes
estatisticamente em uma tarefa cada, nas zonas 2 e 4, respetivamente. O fator "prolongador"incrementa o número de tarefas na zona 4, sendo, por isso, uma agravante na duração do processo.
No fim do presente trabalho são propostas, de diferente impacto e envergadura, soluções que atenuam dificuldades dos trabalhadores, bem como reduzindo, expectativamente,
durações médias de duração das tarefas, assim como atenuando os desvios-padrão das mesmas.
The activity taking place in Aruda’s Air Liquide CMD site is related to hydraulic testing of compessed gas cylinders, obiding to the ISO norm 19016.3. this instalation, relying on work of excessively manual nature, for the current observed industral reality, counts on a lot of ineficiences rooted in the operation, unupdated equipments and with important functionalities missing, when compared to those comercialy available, by the manufac- turers. Aditionally, it’s patent the absence of catalogued production times, as well as the duration of individual tasks for different factors of variation. In order to develop correlations and significances, there were performed, during three months, observations and time measurements of the duration of different tasks. With the collected data, a statistical analysis took place and significance relations between different factors and levels were determined using the Kruskal-Wallis and Fischer test. Due to the impossibility of altering the site’s production plan, no DoE took place. Analyzing the data, one can conclude that the factor "Volume" is significant in tasks in every zone of the process. The factors "Client" and "Guard" are statistically significant for one task, each, in zones 2 and 4, respectively. The factor "collector" increases the number of tasks performed in zone 4, being, for that reason, an enhancer of the duration of the process as a whole. At the end of this work, solutions of different size and impact are proposed. These, if applied, will battle co-worker difficulties, as well as reduce the durations of different tasks, as their standard-deviation.
The activity taking place in Aruda’s Air Liquide CMD site is related to hydraulic testing of compessed gas cylinders, obiding to the ISO norm 19016.3. this instalation, relying on work of excessively manual nature, for the current observed industral reality, counts on a lot of ineficiences rooted in the operation, unupdated equipments and with important functionalities missing, when compared to those comercialy available, by the manufac- turers. Aditionally, it’s patent the absence of catalogued production times, as well as the duration of individual tasks for different factors of variation. In order to develop correlations and significances, there were performed, during three months, observations and time measurements of the duration of different tasks. With the collected data, a statistical analysis took place and significance relations between different factors and levels were determined using the Kruskal-Wallis and Fischer test. Due to the impossibility of altering the site’s production plan, no DoE took place. Analyzing the data, one can conclude that the factor "Volume" is significant in tasks in every zone of the process. The factors "Client" and "Guard" are statistically significant for one task, each, in zones 2 and 4, respectively. The factor "collector" increases the number of tasks performed in zone 4, being, for that reason, an enhancer of the duration of the process as a whole. At the end of this work, solutions of different size and impact are proposed. These, if applied, will battle co-worker difficulties, as well as reduce the durations of different tasks, as their standard-deviation.
Descrição
Palavras-chave
Cilindros de ar comprimido Teste Hidráulico Estudo Estatístico Qualidade Melhoria Industrial DMAIC