A metal strip is rolled in a roll stand and a control device for the roll stand determines, by means of a working cycle, a number of manipulated variables for flatness actuators of the roll stand and actuates them accordingly. The control device implements an optimizer, which provisionally sets the current correction values, and determines a totality of flatness values. Then, the optimizer minimizes the relationship by varying the current correction variables. When determining the current correction variables (s), the optimizer considers linear ancillary conditions, based at least in part on a vector having the ancillary conditions upheld by the current correction values and a vector having the ancillary conditions upheld by the difference of the current correction values relative to the correction values of the preceding working cycle. The control device determines the manipulated variables for the flatness actuators in consideration of the determined current correction variables.

The invention relates to a multiaxial machining center (30) for machining a part (35), comprising: a support plate for supporting a part (35) to be machined, a positioning carriage (36) that can be moved with respect to the support plate along at least one first axis of movement, a machining carriage (32) that can be moved with respect to the positioning carriage (36) along a second axis of movement perpendicular to said at least one first axis of movement, a connection mechanism between the machining carriage and the positioning carriage, which connection mechanism is configured to guide and move in translation the machining carriage, the connection mechanism furthermore comprising: a system for applying a predetermined force to the machining carriage (32) along the second axis of movement, a unit for controlling the force applied to the machining carriage (32) by the application system.

A metal strip is rolled in a roll stand and a control device for the roll stand determines, by means of a working cycle, a number of manipulated variables for flatness actuators of the roll stand and actuates them accordingly. The control device implements an optimizer, which provisionally sets the current correction values, and determines a totality of flatness values. Then, the optimizer minimizes the relationship by varying the current correction variables. When determining the current correction variables (s), the optimizer considers linear ancillary conditions, based at least in part on a vector having the ancillary conditions upheld by the current correction values and a vector having the ancillary conditions upheld by the difference of the current correction values relative to the correction values of the preceding working cycle. The control device determines the manipulated variables for the flatness actuators in consideration of the determined current correction variables.