A plate thickness control device controlling plate thickness of a hot rolling mill that includes a rolling stand. The plate thickness control device includes: a pyrometer disposed on an entry side of the rolling stand; a difference calculation part that outputs a difference temperature between a lock-on temperature of the plate-to-be-rolled measured by the pyrometer and a measurement value of a portion other than a tip portion of the plate-to-be-rolled measured by the pyrometer; a tracking part that transfers the difference temperature from the position of the pyrometer to immediately below the rolling stand based on plate speed of the plate-to-be-rolled; and a computation part that calculates a screw-down amount of the rolling stand based on the difference temperature transmitted from the tracking part.

Methods and apparatus for locally changing a roll gap in the region of the strip edges (10) of a rolled strip (1) in a rolling stand (2). The roll gap can be changed locally in the region of the strip edges (10) of the strip (1) during the hot rolling. Axial displacement of the working rollers (3, 4) in opposite directions is by a displacement distance s, where s is greater than or less than Δr/tan(α) and Δr indicates the wear of the running surface (8) in the radial direction (R) and α indicates the pitch angle of the conical portion (7) of the respective working roller (3, 4).

A meandering control method for steel strip includes: an imaging step of imaging the surface of a traveling steel strip using a line sensor camera installed between adjacent rolling mills; a meandering amount calculation step of calculating the meandering amount of the steel strip by detecting the positions of both end portions in the width direction of the steel strip from a one-dimensional brightness distribution based on the captured image; and a leveling control arithmetic operation step of arithmetically operating a roll opening difference between the operation and drive sides of the rolling mill located on the immediately downstream side of the line sensor camera based on the calculated meandering amount. The imaging is performed in a period of 5 msec or less.

A stretch reducing rolling mill for rolling pipes has a plurality of roll stands arranged in series in a conveying direction of a pipe. A wall thickness measuring device determines a wall thickness progression of the pipe prior to rolling. A control unit controls respective rotational speeds of the roll stands. A pipe position measuring device is arranged in front of the roll stands and continuously measures a current longitudinal coordinate of the pipe. The measured values of the longitudinal coordinate of the pipe are transmitted to the control unit. The control unit controls the rotational speeds of the roll stands based on both the determined wall thickness progression and the transmitted measured values of the current longitudinal coordinate of the pipe, in order to compensate for wall thickness variations of the pipe. A stretch reducing rolling mill is designed to carry out the method.

A method for determining a present thickness of a work item while being processed in a rolling mill, the method including: acquiring a data signal reflecting a time dependence of an eddy current decay in the work item caused by an applied pulsed magnetic field, determining a thickness parameter value based on the acquired signal, the thickness parameter value being determined from samples in the data signal, the thickness parameter value being dependent on a ratio between a thickness of the work item and a resistivity of the work item, computing a ratio between a reference thickness value of the work item and the thickness parameter value to thereby provide an instantaneous resistivity value, determining a mean resistivity value based on the instantaneous resistivity value, and providing an output signal based on the mean resistivity of the work item and the thickness parameter value, the output signal being indicative of the determined present thickness of the work item.

A method for determining a present thickness of a work item while being processed in a rolling mill, the method including: acquiring a data signal reflecting a time dependence of an eddy current decay in the work item caused by an applied pulsed magnetic field, determining a thickness parameter value based on the acquired signal, the thickness parameter value being determined from samples in the data signal, the thickness parameter value being dependent on a ratio between a thickness of the work item and a resistivity of the work item, computing a ratio between a reference thickness value of the work item and the thickness parameter value to thereby provide an instantaneous resistivity value, determining a mean resistivity value based on the instantaneous resistivity value, and providing an output signal based on the mean resistivity of the work item and the thickness parameter value, the output signal being indicative of the determined present thickness of the work item.

A device for ascertaining the lateral strip contour and/or the position of the strip edges of a metal strip. It includes at least one sensing element for ascertaining suitable measurement data. The sensing element is integrated into a lateral guide (17) together with a main part module of the metal strip conveying device. The lateral guide (17) includes at least one wear element (15a, 15b, 15c) which is arranged in the lateral guide and which comprises a wear element adjusting device that can be rotated about a rotational axis (20) substantially perpendicular to a guide plane of the lateral guide (17). The wear element (15a, 15b, 15c) together with the wear element adjusting device is designed as a sensing element. In an operating method, at least one sensing element (15a, 15b, 15c) is brought into contact with a lateral edge at a starting time, and suitable measurement data is ascertained using the sensing element while the metal strip runs past the sensing element. The strip course can be corrected on the basis of the ascertained measurement data using corrective measures on one or more roll stands and/or on one or more lateral guides (17) of the rolling mill.

A rolling mill control system and method includes use of sensors located between rolling mill stands to directly measure metal sheet or plate flatness, thickness profile, position, and the camber of the rolls in the mill. A feedback loop control system adjusts or adapts rolling mill control mechanisms to control the rolling process.

Separating flexibly rolled strip material can include a buffer device for temporarily storing the flexibly rolled strip material; a first feed device behind the buffer device; at least one length measuring device for continuously measuring a length of the strip material; a thickness measuring device for continuously measuring a thickness of the strip material along the length; a second feed device behind the first feed device; a separating device behind the second feed device; the first and second feed devices being configured to move the strip material from the buffer device to the separating device depending on the thickness measurement and the length measurement; the thickness measuring device being arranged between the buffer device and the first feed device; and the length measuring device being arranged behind the first feed device.

Separating flexibly rolled strip material can include a buffer device for temporarily storing the flexibly rolled strip material; a first feed device behind the buffer device; at least one length measuring device for continuously measuring a length of the strip material; a thickness measuring device for continuously measuring a thickness of the strip material along the length; a second feed device behind the first feed device; a separating device behind the second feed device; the first and second feed devices being configured to move the strip material from the buffer device to the separating device depending on the thickness measurement and the length measurement; the thickness measuring device being arranged between the buffer device and the first feed device; and the length measuring device being arranged behind the first feed device.