The Internal Cooled Big Backup Roll With Numbers Of Sleeves Assembled Together

The backup roll of the strip rolling mill is a key component of the steel rolling production line. Due to the large consumption, long manufacture cycle, high roll price; the study of the backup roll has caused great attention to the technical staffs, the research to reduce the consumption of the backup roll has become an important issue.The roll can't achieve the technology requirements because of the repeatedly abrasion and regrinding. At present, weld repairing is the mainly solution, but it is not very satisfaction as the complex technologies and plenty of equipments.In this paper, a kind of internal cooled big backup roll with numbers of sleeves assembled together was brought up. The roll core can be reused. Numbers of sleeves assembled together can reduce the height compare with a single one; it can be mass produced by ring rolling machine. Therefore it can significantly reduce the cost of production.In this paper, the dynamic forming process mechanism of temperature field of backuproll has been studied systematically, and the simulation model of temperature field has been developed. At the same time, the heat transfer equation and the boundary conditions, which is needed for temperature field simulation, has been determined. The temperature field of backup roll of several stiff mills has been calculated with FEM, and the temperature field distribution of it has been obtained after thermal balance. The interference, best shape of sink, temperature and stress fields of the backup roll have been determined by the coupled analysis of the sleeves, roll core, and the shape of the sink.Current FEM software is precise, but the modeling and debugging need professional man, further more FEM need more time. So a special software is made in Matlab language. In this software the finite difference method and Object-orientated technology has been used. The software can be used easily, and can be expanded.The result of the software contrast with the result of FEM, proving that the precision of the software is high enough for engineering.