Redução das horas com a manutenção corretiva dos motores diesel a partir de avaliação da confiabilidade: uma pesquisa-ação no ramo de mineração

Abstract

In order to obtain competitive advantages, organizations seek to review their strategies in order to guarantee production at reduced costs, without, however, compromising quality. Within mining companies, production may be compromised if the equipment used is not reliable, especially when it comes to haul trucks. To guarantee the reliability of this equipment, maintenance planning and control has been strategically highlighted in these organizations, aiming at the balance between reliability and maintenance costs. And, in the search for this balance, several studies have pointed out the advantages of implementing the Six Sigma methodology to reduce variability, increase the levels of reliability and ensure the availability of assets. In this context, this work sought to reduce the number of hours with corrective maintenance of diesel engines for off-road equipment, through the application of Six Sigma methodology tools and process reliability assessment, based on a research cycle. -action, based on the concepts of the reasoning map in conducting projects of this size. It started by defining the problem, surveying the history of corrective engine failures and stratifying possible factors that could interfere with their reliability. Then, the causes were established, the necessary actions to eliminate or mitigate them, recording the results. To verify the effectiveness of the results, the methodology used was replicated in a maintenance process for L1850 loaders to reduce costs in the acquisition of lubricating oil. The results demonstrated the benefits of using the Six Sigma methodology tools, combined with reliability analysis, due to the significant reduction in defects in diesel engines, the costs with corrective and predictive maintenance, in addition to the reduction in costs with the purchase of lubricating oil.