Opportunistic Maintenance Modeling of Large-Scale Hot Rolling Production Line Based on Maintenance Priority and Dual Variable Time Window

Abstract

To solve the problem of differential maintenance demand caused by daily dynamic maintenance and periodic replacement of support rolls in large-scale hot rolling lines, a maintenance priority rule is introduced to identify maintenance judgment order of components under long distance condition and downtime constraint. A dual variable time window rule is constructed to identify whether components should be maintained and distinguish maintenance demand, and then a dynamic opportunity maintenance model is established for the system. The case study shows that the model can effectively solve the problem of differential maintenance scheduling for large-scale hot rolling lines under the constraints of maintenance resources and downtime, and has more cost advantages than the traditional time-window-based model.

Keywords

• large-scale hot rolling line
• opportunistic maintenance
• preventive maintenance
• maintenance priority
• variable time window