Emprego dos conceitos da engenharia da confiabilidade para determinação do ponto ótimo de manutenção preventiva de equipamento industrial

Abstract

It presents the results of applying the reliability engineering concepts in a critical main- tenance equipment of a mining company in the southeastern Minas Gerais. For its development were evaluated times between failures during the 15-month period. The Mi- crosoft Excel software and its supplements were used to determine the β shape parameters and the η life characteristic, both constants listed in the Weibull equation. From these parameters, the cumulative fault distribution F (t) and the reliability curve R (t) were determined. The costs for calculating the optimum maintenance point were determined according to the data collected by the company, taking into account spent material, cost of specialized labor and production stoppage cost. The results showed that the equipment has an increasing failure rate, causing the interruption of the workshop activities. With the data obtained, it was possible to assess what would be the best time to execute a preventive maintenance of the equipment.