| Name: | Description: | Size: | Format: | |
|---|---|---|---|---|
| 10.61 MB | Adobe PDF |
Authors
Advisor(s)
Abstract(s)
Os conhecimentos profundos dos processos de fabrico, bem como a sua otimização, apresentam-se como fatores imprescindíveis na busca da melhor qualidade de produtos. É esta ótica de melhoria contínua que torna as empresas em organizações rentáveis e sustentáveis. Esta dissertação apresenta um estudo de processo realizado na empresa Continental MaborIndústria de Pneus S.A., em parceria com o Instituto Superior de Engenharia do Porto (ISEP). O presente documento expõe um estudo sobre as tensões de desenrolamento das cordas têxteis no processo de fabrico de cap ply, utilizando as máquinas chamadas de cap-strips para a sua produção. Este estudo determina qual a influência das tensões de desenrolamento nas propriedades físicas e de contração da corda, assim como nas propriedades do cap ply, nomeadamente a adesão em verde e peel adhesion. Para além disso, também é estudado o impacto das tensões de corda na uniformidade do pneu e no próprio processo de fabrico. Todas as conclusões retiradas têm como base a realização de experiências e execução de testes estatísticos. Com esta dissertação, concluiu-se que as tensões de desenrolamento das cordas têxteis têm algum impacto nas propriedades do cap ply, mas não têm qualquer influência na uniformidade do pneu. Paralelamente ao estudo do processo, foi realizada uma tentativa de otimização do processo de fabrico, com o intuito de reduzir tempos de paragem do processo e quantidade de sucata. Esta melhoria do processo passa pela implementação de um sistema de alinhamento das cordas têxteis, com o objetivo de reduzir a quantidade de cordas partidas.
The deep knowledge about manufacturing processes, as well as their optimization, present themselves as indispensable factors in the search for the best product quality. It is this point of view of continuous improvement that makes companies in profitable and sustainable companies. This dissertation presents a process study carried out at Continental Mabor-Indústria de Pneus S.A., in partnership with the Instituto Superior de Engenharia do Porto (ISEP). This work presents a study about unwinding tension of textile cords in the cap ply manufacturing process, using machines called cap-strips for production. This study determines the influence of unwinding tension on the physical and shrinkage properties of the cord, as well as on the properties of cap ply, namely green adhesion and peel adhesion. Furthermore, the impact of cord tension on tire uniformity and the manufacturing process itself is also studied. All conclusions are based on the performed experiments and the execution of statistical tests. With this dissertation, it was concluded that the unwinding tension of the textile cords have some impact on the cap ply properties but have no influence on the tire uniformity. Parallel to the study of the process, an attempt was made to optimize the manufacturing process, to reduce downtimes and the amount of scrap. This improvement of the process involves the implementation of a system to align the textile cords, with the goal of reducing the quantity of broken cords.
The deep knowledge about manufacturing processes, as well as their optimization, present themselves as indispensable factors in the search for the best product quality. It is this point of view of continuous improvement that makes companies in profitable and sustainable companies. This dissertation presents a process study carried out at Continental Mabor-Indústria de Pneus S.A., in partnership with the Instituto Superior de Engenharia do Porto (ISEP). This work presents a study about unwinding tension of textile cords in the cap ply manufacturing process, using machines called cap-strips for production. This study determines the influence of unwinding tension on the physical and shrinkage properties of the cord, as well as on the properties of cap ply, namely green adhesion and peel adhesion. Furthermore, the impact of cord tension on tire uniformity and the manufacturing process itself is also studied. All conclusions are based on the performed experiments and the execution of statistical tests. With this dissertation, it was concluded that the unwinding tension of the textile cords have some impact on the cap ply properties but have no influence on the tire uniformity. Parallel to the study of the process, an attempt was made to optimize the manufacturing process, to reduce downtimes and the amount of scrap. This improvement of the process involves the implementation of a system to align the textile cords, with the goal of reducing the quantity of broken cords.
Description
Keywords
Qualidade Desenrolamento de cordas têxteis Tensão de cordas têxteis; Cap ply Cap-strip Processo de fabrico Otimização Cordas partidas Fabrico de pneus Quality Unwinding of textile cords Textile cord tension Manufacturing process Optimization Broken cords Tire manufacturing