Proposta de aplicação da manutenção centrada em confiabilidade em uma metalúrgica

Abstract

Reliability Centered Maintenance (RCM) is a methodology used to ensure that all components of an asset or operating system have their functions preserved, their condition of safe use, quality, economy, and performance without degrading the environment. This paper aims to propose the implementation of RCM on critical machine Casting items in the metallurgical foundry sector, in order to mitigate failure modes and increase process reliability. The stages of the present study were organized into: (i) data collection from the first half of 2018 and 2019 in daily production and shutdown reports; (ii) monitoring and filtering of information; (iii) determination of the object of study; (iv) description of the casting process; (v) investigation into machine mold subsets; (vi) determination of the target subset; (vii) observation on site; (viii) construction and analysis of FMEA; (ix) calculations of MTBF, MTTR, Availability, Failure Rate, Probability and Reliability of equipment indices and (x) proposal of an effective and efficient maintenance plan. In this way, it was proved that the machine 2 under study presented in both years the largest number of stopping events in the stacking subset, having as one of the main causes the speed of the machine operation and mismatch in the proximity sensor related to lack of proper inspections and preventive maintenance. The maintenance plan proposed by Reliability Centered Maintenance aims to increase machine reliability and productivity and assist the foundry industry in decision making.