| Name: | Description: | Size: | Format: | |
|---|---|---|---|---|
| 19.19 MB | Adobe PDF |
Authors
Advisor(s)
Abstract(s)
Os cabos metálicos usados intensivamente nos mais diversos acionamentos dentro de um veículo, como por exemplo a abertura das portas, tampa da mala, tampa do combustível, tampa do motor, etc., necessitam na maior parte dos casos de seguir percursos complexos, sendo utilizada uma espiral metálica, devidamente forrada com polímero extrudido, para a condução do cabo com o menor atrito possível e sem congestionamentos provocados pelo percurso.
As máquinas de produção desta espiral são equipamentos muito específicos, com capacidade produtiva limitada pela própria cinemática da máquina. No entanto, como em muitos outros casos, as máquinas podem ser sujeitas a melhoramentos, com vista a incrementar a sua capacidade de produção. Contudo, os resultados pretendidos poderão nunca ser atingidos ou gerar custos de manutenção inviáveis, devido à cinemática das máquinas.
Este trabalho teve por base uma solicitação da FicoCables para analisar e otimizar o funcionamento e capacidade produtiva de máquinas concebidas para fabricar espiral metálica a uma dada cadência, mas posteriormente adaptadas para incrementar a sua capacidade de fabrico. As condições em que o melhoramento foi realizado impediam que a cadência estabelecida fosse atingida, devido a problemas de vibração exagerada e de colocar em risco a integridade de alguns sistemas da mesma, também através de sobreaquecimento em determinados locais. O trabalho de análise foi cuidadosamente desenvolvido, permitindo a identificação de alguns fatores que poderiam estar na origem da vibração excessiva sentida. Foram indicadas diversas soluções possíveis, tendo sido implementadas grande parte das mesmas, o que conduziu a uma melhoria significativa do seu desempenho, atingindo o nível de produção pretendido.
Metallic harnesses intensively used in the most diverse control operations in a vehicle, such as opening doors, trunk lid, fuel cap, engine cover, etc. need in most cases to follow complex pathways being used a metal spiral, properly lined with extruded polymer, to drive the cable with the lowest possible friction and without traffic jams along the way. The machines devoted to the production of this spiral are very specific equipment, with limited productive capacity due to the machine kinematics. However, as in many other cases, machines can be subjected to improvements, with a view to increase their production capacity. However, when this is not met due to machine kinematics and dynamics, the desired results may never be attained or generate maintenance costs that will become unviable. This work was based on a request from FicoCables company to analyse and optimize the functioning and productive capacity of machines designed to manufacture spiral to a given cadence, but which were later adapted to increase their manufacturing capacity. The conditions under which the improvement was carried out prevent reaching the desired capacity, due to excessive vibration problems and to putting at risk the integrity of some of these systems, through overheating at specific parts. The analysis has been carefully developed, allowing the identification of a number of factors that could be in the origin of the excessive vibration. Several possible solutions were identified, having been implemented much of them, leading to a significant improvement of the machine’s performance, reaching the desired production level.
Metallic harnesses intensively used in the most diverse control operations in a vehicle, such as opening doors, trunk lid, fuel cap, engine cover, etc. need in most cases to follow complex pathways being used a metal spiral, properly lined with extruded polymer, to drive the cable with the lowest possible friction and without traffic jams along the way. The machines devoted to the production of this spiral are very specific equipment, with limited productive capacity due to the machine kinematics. However, as in many other cases, machines can be subjected to improvements, with a view to increase their production capacity. However, when this is not met due to machine kinematics and dynamics, the desired results may never be attained or generate maintenance costs that will become unviable. This work was based on a request from FicoCables company to analyse and optimize the functioning and productive capacity of machines designed to manufacture spiral to a given cadence, but which were later adapted to increase their manufacturing capacity. The conditions under which the improvement was carried out prevent reaching the desired capacity, due to excessive vibration problems and to putting at risk the integrity of some of these systems, through overheating at specific parts. The analysis has been carefully developed, allowing the identification of a number of factors that could be in the origin of the excessive vibration. Several possible solutions were identified, having been implemented much of them, leading to a significant improvement of the machine’s performance, reaching the desired production level.
Description
Keywords
Melhoramento de processos Melhoria de equipamentos Análise de vibrações Diagramas Causa-Efeito Produção mecânica Fabrico de espiral metálica Processes improvement Equipments improvement Vibration analysis Ishikawa diagrams Mechanical production Metallic spiral production