Operational Risk-Based Maintenance Decision-Making Modeling for Manufacturing Systems Considering Workpiece Quality

Manufacturing systems often have the risk of equipment failure during the production process, and these risks not only affect production mission, but also affect product quality. To reduce these risks, the maintenance of the manufacturing system is generally adopted in the form of correct maintenance (CM) or preventive maintenance (PM), but the usage of a single maintenance method for the manufacturing system will cause excessive maintenance or untimely maintenance. Therefore, this paper proposes maintenance decision-making model based on dynamic operational risk. First, the connotation of manufacturing system operational risk considering workpiece quality and a framework of operational risk-based maintenance (RBM) are given. Then, the operational risk assessment model is constructed from three aspects of mission risk, quality risk and infant failure risk, and the specific maintenance mode selection process is obtained based on the risk assessment results. Finally, the effectiveness of the proposed method is verified by a subway current receiver manufacturing system.