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Abstract(s)
O presente trabalho realizado na Continental Mabor, Indústria de Pneus S.A, na Direção da Qualidade, no Departamento de Uniformidade, revela um problema do dia-a-dia durante o processo produtivo de um pneu, que afeta diretamente a sua uniformidade. A insuflação ineficiente das carcaças no momento em que é acoplado o conjunto, é um fator crítico na construção de um pneu, mas que, no entanto, nunca foi estudado o seu efeito sistemático na fábrica de Lousado, nomeadamente, para a nova geração de máquinas de construção. Como tal, com o aumento do tamanho e da sua complexidade, problemas novos começam a ganhar importância e a ser tema de discussão. Foi proposto então um caso real para esta dissertação, no qual ao longo dos últimos tempos foram realizados vários estudos de parâmetros de receitas de máquinas existentes, cujo objetivo primordial visa minimizar os problemas de não uniformidade de um pneu durante o seu processo produtivo de construção. Houve a necessidade de perceber todo o processo produtivo e proceder à criação ao longo do tempo de uma biblioteca de análises e testes. Para formulação do problema, efetuaram-se estudos de forma a analisar a influência dos materiais, das várias máquinas de construção e da importância do volume do pneu. Para tal, foram utilizadas ferramentas da estatística e da engenharia da qualidade para proceder à realização de desenhos de experiências. No final realizou-se uma aplicação em Microsoft Excel que visa ser uma ferramenta de suporte para o Departamento de Assistência Técnica à Produção (DATP) contendo as melhores receitas de pressões encontradas para cada tipo de secção de pneu. As receitas das máquinas para cada segmento de pneu serão posteriormente alteradas para as soluções otimizadas.
The Present Work Held at Continental Mabor, Indústria de Pneus S.A, in the Quality Management, in the Uniformity Department, reveals a big problem during the production process of a tire, which directly affects its uniformity. The inefficient insufflation of carcasses at the time of the coupling of it with the tread package is a critical stage during the construction of a tire, nevertheless, it was never studied the impact and the systematic effect in the radial forces, in this plant, for the new generation of machines. With the increasing of the tire size and the complexity, this small problem is now a big problem. It was proposed a real case for this thesis, in which during the last months there were realized a big amount of studies in the building machines to minimize the problems of non-uniformity of a tire during this production process step. It was necessary to first understand all the production process and with a lot of work and focus on the goal, it was created over time a vast library of analysis and testing in the building machines, so imagining a “map” which initially was unclear and without information, at the end it will become a colorful “map” with all the points connected with each other and to get all of this database of knowledge that didn’t exist until now, it took several hours of study, training and the usage of quality tools that were really important in the statistical evaluation of the problems. Also, the experimental drawings combined with brainstorming’s and Microsoft Excel gave the body and brain for all the statistical analysis throughout this project. To formulate the problem, studies were carried out to analyze the influence of the materials, the various construction machines and the importance of the tire volume. Statistical and quality engineering tools were used to carry out experiment drawings such as Taguchi Methods. In the end an application was made in Microsoft Excel that aims to be a support tool for the Technical Support to Production Department (DATP) containing the best pressure recipes found for each type of tire section. All the recipes of the machines for each type of tire will be changed to the solutions found in this thesis.
The Present Work Held at Continental Mabor, Indústria de Pneus S.A, in the Quality Management, in the Uniformity Department, reveals a big problem during the production process of a tire, which directly affects its uniformity. The inefficient insufflation of carcasses at the time of the coupling of it with the tread package is a critical stage during the construction of a tire, nevertheless, it was never studied the impact and the systematic effect in the radial forces, in this plant, for the new generation of machines. With the increasing of the tire size and the complexity, this small problem is now a big problem. It was proposed a real case for this thesis, in which during the last months there were realized a big amount of studies in the building machines to minimize the problems of non-uniformity of a tire during this production process step. It was necessary to first understand all the production process and with a lot of work and focus on the goal, it was created over time a vast library of analysis and testing in the building machines, so imagining a “map” which initially was unclear and without information, at the end it will become a colorful “map” with all the points connected with each other and to get all of this database of knowledge that didn’t exist until now, it took several hours of study, training and the usage of quality tools that were really important in the statistical evaluation of the problems. Also, the experimental drawings combined with brainstorming’s and Microsoft Excel gave the body and brain for all the statistical analysis throughout this project. To formulate the problem, studies were carried out to analyze the influence of the materials, the various construction machines and the importance of the tire volume. Statistical and quality engineering tools were used to carry out experiment drawings such as Taguchi Methods. In the end an application was made in Microsoft Excel that aims to be a support tool for the Technical Support to Production Department (DATP) containing the best pressure recipes found for each type of tire section. All the recipes of the machines for each type of tire will be changed to the solutions found in this thesis.
Description
Keywords
Parâmetros de receita Uniformidade de um pneu Complexidade Insuflação ineficiente da carcaça Desenho de experiências Recipes parameters Tire uniformity Complexity Insufficient insufflation of the carcass Design of Experiments Taguchi