Patent ID: 8096161

Claim:
Method for rolling strip in a rolling stand of a rolling train, wherein the rolling stand consists of: two axially shiftable work rolls that are provided with a CVC cross section or similar contour, the curved contour being expressed by a polynomial of third or higher order; two backup rolls and two additional intermediate rolls; and a work roll bending system and an additional intermediate roll bending system, wherein work roll bending or work roll shifting is used from case to case as an adjusting mechanism to control strip flatness and strip profile, wherein cyclic variation of the work roll bending from strip to strip in a well-defined predetermined part of an adjustment range of the bending simultaneously induces or forces increased cyclic shifting of the work rolls in order to adjust the strip flatness and the body strip profile, wherein a combined action of both adjustment systems (work roll bending and work roll shifting) causes very nearly parabolic effects of both adjustment systems to complement each other, thereby ensuring flatness as well as optimum uniformity of work roll wear, wherein interaction between the work roll shifting and the work roll bending is controlled online by a process model, and wherein the cyclic variation of work roll positions or work roll bending is carried out only in a permissible range so that strip quality parameters, including flatness (parabolic and higher order), strip contour quality, and strip profile level, are fulfilled, wherein to maintain the parameters, a cyclic shifting stroke and/or a preset range for the work roll bending is limited by the process model (monitored online), wherein the cyclic shifting of the work rolls is indirectly forced by the cyclic variation of the work roll bending.