Maintenance modelling for work rolls in hot finishing mill group with constraint of thermal character

Abstract

A maintenance model is specially developed for the work rolls equipped in the hot finishing mill group, with the purpose to decrease the total maintenance cost for the roll group under the constraint of the production batches and the roll thermal character. During the maintenance modelling at roll level, the impacts of the surface wear of the work roll on its failure rate state, the production quality and the preventive maintenance cost are deeply discussed. Then, a preventive maintenance grouping method is further proposed at roll group level, with the mutual restriction between the adjustable replacement time of the roll group and the optimal maintenance time of each work roll involved. The case study shows that the proposed maintenance model is practical for the maintenance scheduling of the work rolls in the real rolling production scenario. The total maintenance cost under the proposed maintenance method is always lower that the ones under the individual OM method and the maintenance window-based OM method.

KEYWORDS:

• Work roll
• preventive maintenance
• opportunistic maintenance
• failure rate
• product quality

Disclosure statement

No potential conflict of interest was reported by the author(s).

Data availability statement

The authors confirm that the data supporting the findings of this study are available within the article.

Additional information

Funding

This work is supported by the National Key Research and Development Project of China [no. 2020YFB1711103] and the National Natural Science Foundation of China [no. 52075336].

Notes on contributors

Xiaojun Zhou

Xiaojun Zhou is an Associate Professor in the Department of Industrial Engineering, Shanghai Jiaotong University, P.R. China. He received the Ph.D. degree from Shanghai Jiaotong University. In 2005, he was a visiting scholar in University of Michigan, U.S.A. His research focuses on the maintenance management, modelling and decision making for manufacturing systems. He has been in charge of three projects from National Natural Science Foundation of China, and two projects from Natural Science Foundation of Shanghai. He is currently the author of more than 50 papers on maintenance.

Xurui Ben

Xurui Ben is currently pursuing the M.S. degree in industrial engineering at Shanghai Jiaotong University. His research focuses on the preventive maintenance modelling for hot finishing mill groups.