Control of self-excited third octave vibration in a metal rolling mill can be achieved by adjusting the tension of the metal strip as it enters a stand. Self-excited third octave vibration can be detected and/or measured by one or more sensors. A high-speed tension adjustor can rapidly adjust the entry tension of the metal strip (e.g., as the metal strip enters a mill stand) to compensate for the detected self-excited third octave vibration. High-speed tension adjustors can include any combination of hydraulic or piezoelectric actuators coupled to the center roll of a bridle roll to rapidly raise or lower the roll and thus induce rapid tension adjustments in the strip. Other high-speed tension adjustors can be used.

Method for the production of flat metal products, in particular coils of strip, in endless and/or semi-endless mode, in which a metal product is continuously fed to a rolling mill consisting overall of at least 4 stands. The rolling stands are, in sequence, roughing stands, and finishing stands. It is provided to perform a flying gauge change of the metal product exiting from the rolling mill.

A bar unloading apparatus of the revolver type, comprising: a longitudinal rotor (10) divided into at least three longitudinal stretches (11, 12, 13) integral with one another and adapted to rotate about a longitudinal rotation axis, on the outer longitudinal surfaces of which there is provided a plurality of longitudinal channels, extending on the at least three stretches over the whole longitudinal extension of the rotor (10) and parallel to said longitudinal axis, to receive respective longitudinal bars, and at least one braking device for braking the longitudinal bars entering in at least one of the longitudinal channels, wherein the at least one braking device is integrated in at least one first stretch (12) of said at least three longitudinal stretches (11, 12, 13), is rotationally fixed to the longitudinal rotor (10) and is provided with braking elements (1) in each of said longitudinal channels so that said at least one braking device can rotate together with the longitudinal rotor (10) and brake the longitudinal bars even during a rotation of the longitudinal rotor (10).

A contactless braking system and a related method for decelerating long products (bi) exiting from a rolling mill (100). At least one braking module (6) includes a multiplicity of electromagnets (60) in a series along a braking line (1b). Each magnet has an open magnetic core (61) and a coil (62) around the magnetic core (61). The open magnetic core (61) has a gap formed by two opposed poles. The electromagnets (60) are configured so that the gap of each open magnetic core (61) lets contactlessly slide therethrough each long product (bi) exiting from the rolling mill (100). A braking magnetic force (Fd) is exerted on the long product (bi) contactlessly sliding through the gap. The braking magnetic force (Fd) is opposite to the direction of movement of the long product (bi) exiting the rolling mill (100).

A steel-sheet snaking preventing device for a vertical looper includes a jack mechanism provided at each of at least two corners of a looper carriage and coupled via a metal fitting to a chain or a wire rope that pulls the looper carriage; a tilt meter configured to detect the amount of tilt of the looper carriage; a level meter configured to detect a height of the looper carriage; and a means for receiving detection signals from the tilt meter and the level meter, determining the amount of tilt of the looper carriage at which the amount of snaking of a steel sheet becomes zero, sending the determined amount of tilt of the looper carriage as a command to the jack mechanism, and controlling the amount of tilt of the looper carriage by the jack mechanism.

The invention may relate, among other things, to a device for straightening a metal strip having two strip drives which are suitable together to apply tension on the metal strip to straighten the metal strip, wherein at least one of the strip drives is a linear drive, characterized in that the at least one linear drive has a positioning device such that the linear drive can be moved relative to the longitudinal axis of the device.

The invention may relate, among other things, to a device for straightening a metal strip having two strip drives which are suitable together to apply tension on the metal strip to straighten the metal strip, wherein at least one of the strip drives is a linear drive, characterized in that the at least one linear drive has a positioning device such that the linear drive can be moved relative to the longitudinal axis of the device.

A meandering amount detection method for a metal strip traveling in a state of being overlapped in a plurality of stages, includes: calculating an end portion position in a width direction of a metal strip in each stage using an angle formed by a reference direction, which is any direction determined from a reference point, and a direction connecting the reference point and an end portion position in a width direction of a metal strip in each stage, a distance between the reference point and an end portion position in a width direction of a metal strip in each stage, and a distance between a straight line including a width direction of the metal strip and the reference point; and calculating a meandering amount of a metal strip in each stage based on the calculated end portion position in the width direction of the metal strip in each stage.