The sleeve of oil film bearing in the backup roller of the 1580PC hot strip mill is always damaged during the process of setup

disassembly and usage period

which results in production accidents and decreases the service life of bearing.By adopting boundary element method(BEM) with 3D elastic-plastic contact

the paper quantitatively studies the changing laws of stress and strain under different hydroform pressures and axial thrust forces during the setup and disassembly process of sleeve.The reasons that result in sleeve failure are analyzed as well.Finally

detailed experiments are carried out by two sample mills.The experimental results have consistency with the theoretical analyzing result.The methods of theory

experiment and improvement are supplied for resolving abnormal damaged problem.