System and a method for measuring and determining flatness

A method for measuring and determining the flatness of a strip of rolled material in a system based upon the Wrap Angle (α) of the strip on a measuring roll, said measuring roll, having a cylindrical central structure, having a number of measuring devices for force and pressure registration, said devices generating measurement output signals (Upi) depending on the contact between the strip and the measuring roll, wherein said measurement output signal (Upi) includes a force component signal (UFi), a Flatness Determination Unit for calculating the flatness (Δσ1) of the strip based exclusively on signals derived from measurement output signals (Upi) values generated by said measuring devices and information about the values of the width and thickness of the strip, wherein said method comprises the steps of:

• continuously determining the Wrap Angle (α) from at least one measurement output signal (Upi);
• and
• automatically compensating for a changing Wrap Angle (α).

A flatness determination signal for measuring and determining the flatness of a strip of rolled material and derived from at least one measurement signal (Upi), wherein each separate measurement signal (Upi) is generated by a corresponding measuring device of all measuring devices belonging to at least one of all measurement zones of a measuring roll and comprises one or more measurable values for calculating at least one of following quantities or vectors:

• strip tension vector (T,) Wrap Angle (α) distributed force vector (F2,) force vector (Fmi,) flatness vector (Δσ1[N/mm−2] and/or a corresponding quantity flatness vector (Δσ2)[I-unit.]

A system for measuring and determining a flatness of a strip of rolled material, comprising:

• a measuring roll, having a cylindrical central structure, having a number of measuring devices for force and pressure registration, said devices generating measurement output signals (Upi) depending on the contact between the strip and the measuring roll, said measurement output signal (Upi) including a force component signal (Upi), a Flatness Determination Unit, for calculating the flatness (Δσ1) of the strip based exclusively on signals derived from measurement output signal (Upi) values generated by said measuring devices and information about the values of the strip width (w) and strip thickness (t), said unit including programmable means and a computer program therefore for continuously determining the Wrap Angle (α) from at least one measurement output signal (Upi) and means for automatically compensating for a changing Wrap Angle (α).

A system for measuring and determining a flatness of a strip of rolled material, comprising:

• a measuring roll, having a cylindrical central structure, having a number of measuring devices for force and pressure registration, said devices generating measurement output signals (Upi) depending on the contact between the strip and the measuring roll, said measurement output signal (Upi) including a force component signal (Upi), and a signal comprising a value for a Flatness Vector according to any of (Δσ1) or (Δσ2) Flatness Determination Unit, for calculating the flatness (Δσ1) of the strip based exclusively on signals derived from measurement output signal (Upi) values generated by said measuring devices and information about the values of the strip width (w) and strip thickness (t), said unit also having means for continuously determining the Wrap Angle (α) from at least one measurement output signal (Upi) and means for automatically compensating for a changing Wrap Angle (α).