Development of strip crown control system in hot strip mill

In order to control hot strip crown and flatness, a paired crossed roll mill was installed in No.1 Hot Strip Mill in NKK Fukuyama Works. Mathematical models for cross angle setting and a new method to set each stand cross angle have been applied to an online process computer system, in order to control strip crown and flatness effectively. Mathematical models of strip crown are based on a roll deformation, and accuracy was improved. The characteristic of the mill setting model is the application of fuzzy membership function. Using the new control system, strip crown can be controlled accurately