Abstract: A method for tension control in a band-shaped material between two tension points, in particular between two adjacent roll stands, wherein at least one of the tension points has a rotary drive as an actuator. In order to make known tension controls of this type more effective and faster the controller output signal is varied in connection with the conversion thereof into the actuating signal for the rotary drive, at least temporarily, in dependence on a variable representing the band-shaped material.

Abstract: A calibration determination device includes: a free roll that conveys the bonding member; a load detection device that detects a load applied to a bearing of the free roll; a tension adjustment device that winds the bonding member to increase a tension applied to the bonding member and unwinds the bonding member to reduce the tension applied to the bonding member so as to adjust the tension applied to the bonding member; and a calibration determination unit that determines whether calibration of the load detection device is necessary. The tension adjustment device unwinds the bonding member to cause the bonding member not to be subjected to the tension, and the calibration determination unit determines whether the calibration of the load detection device is necessary based on the load detected by the load detection device with the bonding member not being subjected to the tension.

Abstract: Mill control system and method for metal strip rolling controlled in response to a sequence of controller scans are provided. A sensor suite is coupled to sense a plurality of parameters regarding the strip rolling. A model responsive to the sensed parameters is configured to estimate per scan at least one matrix based on the sensed parameters and indicative of state conditions of the strip rolling. A controller includes an inner control loop configured to effect a control law to generate a control vector per scan. The inner control loop may be configured to have dynamic characteristics, which remain substantially the same for each scan of the controller. The dynamic characteristics of the inner control loop are effective to determine a pointwise online control solution based on the matrix indicative of the state conditions of the strip rolling, without having to compute a Riccati control solution per scan.

Abstract: A strip has a left and a right side. The strip is rolled in a rolling stand. Stresses occurring in the strip at the feed and exit sides are detected by corresponding measuring sensors positioned on the left and right sides of the strip. The detected stresses are fed to a control unit for the rolling stand. The control unit determines a measurement for the transversal positioning of the strip in relation to the rolling stand using the relationship Z=ZLE*ZLA?ZRE?ZRA, where Z is the measurement. ZLE, ZLA, ZRE and ZRA are the individually detected stresses. The control unit determines a correcting variable for correcting the transversal positioning of the strip using the measurement for the transversal positioning and controls the rolling stand according to the correcting variable.

Abstract: In a multi-stand rolling mill train, a strip successively runs through individual rolling stands. The strip—always as seen in relation to a rolling center line—is threaded into each of the rolling stands with known respective head offset and inlet-side head pitch, and therefore a strip head emerges with the respective head offset, a respective outlet-side head pitch and a respective outlet-side head curvature. The respective outlet-side head pitch is determined on the basis of respective inlet-side head pitch and pass reduction which takes place in the respective rolling stand. The respective outlet-side head curvature of the strip is determined based on respective measured and further data. The respective outlet-side head curvature is used to determine a respective control intervention for the respective rolling stand and/or the one arranged directly downstream and to drive the corresponding rolling stand in accordance with the respective determined control intervention.

Abstract: The invention relates to a method for suppressing the influence of roll eccentricities on the run-out thickness of a rolled stock, which runs through a rolling stand, roll eccentricities being identified by using a process model and taken into consideration in the determination of a correction signal for at least one final control element, preferably a final control element for the adjustment position, of the rolling stand, wherein the measured tensile force upstream of the rolling stand is fed to the process model to identify the roll eccentricities. According to the invention, variations in tensile force are fed back in a targeted manner to reduce the effects of periodic roll eccentricities on the rolled stock, whereas all other sources of variation are eliminated. A process model of the rolling nip and the rolls, preferably based on the observer principle, produces reliable data on the roll eccentricity.

Abstract: A method and a device for winding metal strip onto a mandrel to which the metal strip is fed by a driver encompassing a bottom and a top drive roller in a driver frame. In order to regulate the driver in such a way by measuring the strip tension, the longitudinal tensile strength applied to the metal strip by the driver to control the strip run through the driver is determined by means of a strip tension measuring device which is mounted on the driver frame, in a pivot located shortly behind the bottom drive roller, and can be swiveled into the metal strip from below. The strip tension measuring device is composed of a first lever arm and a second lever arm which is hingedly mounted at the front of the first lever arm and the forward end of which is provided with a roller.

Abstract: A method is provided for controlling cold rolling of a sheet metal strip involving continuously passing the strip in at least two successive rolling stands, each stand including at least two driven rolls between which the strip moves and is plated. The method includes estimating the slippage variation in output of one rolling stand; and correcting the rotation speed of the rolls of at least one corrected rolling stand based on the estimated slippage variation.

Abstract: A system for on-line property prediction for hot rolled coils in a hot strip mill of a steel plant, including a unit for capturing the chemistry from the steel making stage and providing the data on rolling schedule. Field devices are provided at the instrumentation level for measuring process parameters during hot rolling. A programmable logic controller is used for acquiring data of measured parameters from the field devices and feeding the data to a processor. Means is provided for conversion of the measured data from time domain to space domain using segment tracking. A computation module processes the converted space domain data for predicting mechanical properties along the length and through the thickness of the strip being rolled. A display unit displays the predicted properties. The data obtained can be stored in a data warehouse for future use. A unit provided in the system can collect the predicted properties and feed the same to the scheduling unit.

Abstract: A plurality of press devices 2 are arranged in a plastic working system. The plastic working system includes: a loop correction sensor 13 for watching a slack of a coil material C intermittently delivered from a preceding first press device 2a; and a second slack watching means 19 for watching a slack of the coil material C generated at the time of sending the coil material C to a succeeding second press device 2b. According to the slack generated by intermittent feeding of the coil material C sent from the first press device 2a, intermittent feeding is converted to continuous feeding by the feeding means 15. At the same time, the continuous feeding speed is subjected to speed increasing/decreasing control. On the other hand, by the second slack watching means 19, a slack of the coil material C is watched at the time of feeding the coil material C to the second press device 2b and the preceding first press device 2a is subjected to speed increasing/decreasing control.

Abstract: A method and device for controlling the final thickness of a rolled product at a tandem rolling mill exit which make it possible to remove the cyclic defects of the product thickness variation. The method includes using at least one rolling stand provided with hydraulic adjustment devices located on the tandem rolling mill exit and in compensating the cyclic defects of the product thickness variation generated upstream through the entire rolling mill on the stand with the aid of an adjuster (R) coordinated with the frequency of defects. The method and device are suitable for tandem cold rolling mills producing metal strips. The thickness defects are detectable by a thickness sensor.

Abstract: A side looper comprises an entry guide for directing a longitudinally moving long product into an arcuate path, an exit guide for receiving the product exiting from the arcuate path, and inner and outer guide walls arranged between the entry and exit guides. The guide walls are adjustable between mutually spaced closed positions fixing the curvature of the arcuate path, and open positions allowing the curvature of the arcuate path to either increase or decrease.

Abstract: The invention relates to a method for controlling a rolling process, in which a metal strip is rolled flat by use of at least one roller. It is known from the prior art that the relative position of a neutral point represents a measure of the instantaneous stability of a rolling process. However, traditional methods for calculating the position of the neutral point do not accurately represent the actual properties of metal and therefore have only limited usefulness for predicting the stability of a rolling process. In order to allow better control of a rolling process for rolling a metal strip with regard to the actual behavior of the metal strip, the invention proposes a new method for calculating the relative position of the neutral point, in which in particular the flat yield stress ke and the hydrostatic pressure pNH at the neutral point are incorporated.

Abstract: The invention relates to a method and a device for winding metal strips (13) onto a coiling mandrel (4) which is disposed in a coiler shaft (3) and to which the metal strip is fed by a driver (2) encompassing a bottom and a top drive roller (6, 7) in a driver frame (5). A bench (11) is provided below the metal strip (13) for guiding purposes while a strip switch (17) and a swiveling shaft flap (19) are arranged above the metal strip, the shaft flap (19) adjoining the strip switch (17) to the vicinity of the coiling mandrel.

Abstract: A method is provided for controlling cold rolling of a sheet metal strip involving continuously passing the strip in at least two successive rolling stands, each stand including at least two driven rolls between which the strip moves and is plated. The method includes estimating the sliding variation in output of one rolling stand; and correcting the rotation speed of the rolls of at least one corrected rolling stand based on the estimated sliding variation.

Abstract: The invention relates to a method for straightening a metal strip (1) which is guided in the direction of transportation (R) through a straightening machine (2) and is straightened. In the straightening device (2), the metal strip (1) is impinged upon by a straightening force (F) which is applied by a plurality of straightening rollers (3) in the direction (N) which is perpendicular to the surface of the metal strip (1). According to the invention, prior to the metal strip (1) entering into the straightening machine (2), the thickness (d) of the metal strip (1) is determined and the position (a) of the straightening rollers (3) in the direction (N) which is perpendicular to the surface of the metal strip (1) is taken into account according to the determined thickness (d).

Abstract: An apparatus for and method of manufacturing lithium or lithium alloy anodes for electrochemical cells by a lamination process wherein a lithium or lithium alloy sheet is reduced into a thin lithium or lithium alloy film. The method and apparatus provide adjustments of the profile defined by the meeting surfaces of a pair of working rollers to compensate for thermal dilation of the working rollers or to compensate for irregular thickness of the lithium or lithium alloy sheet to control the shape and profile of the lithium or lithium alloy film being laminated.

Abstract: A plurality of press devices 2 are arranged in a plastic working system. The plastic working system includes: a loop correction sensor 13 for watching a slack of a coil material C intermittently delivered from a preceding first press device 2a; and a second slack watching means 19 for watching a slack of the coil material C generated at the time of sending the coil material C to a succeeding second press device 2b. According to the slack generated by intermittent feeding of the coil material C sent from the first press device 2a, intermittent feeding is converted to continuous feeding by the feeding means 15. At the same time, the continuous feeding speed is subjected to speed increasing/decreasing control. On the other hand, by the second slack watching means 19, a slack of the coil material C is watched at the time of feeding the coil material C to the second press device 2b and the preceding first press device 2a is subjected to speed increasing/decreasing control.

Abstract: In a tandem rolling mill control system, an arithmetic operation on a looper torque command is adopted so that a signal obtained by integrating a looper angle deviation is not contained as a component, and a looper speed controller performs an arithmetic operation with a sampling period at a higher speed than a looper angle controller.

Abstract: A strip deflection roller, especially a tension measuring roller or looper roller for matching tension in rolling stock between two roll stands for hot rolling and cold rolling of strip. The strip deflection roller includes at least five adjacent disks which are mounted on a common eccentric shaft so as to be freely rotatable independently. At most two of the disks are mounted concentric to the axis of rotation of the eccentric shaft, and the height positions of the rest of the disks can be changed for influencing the profile and regulating the flatness of the strip guided over the strip deflection roller by rotating the eccentric shaft.

Abstract: A looper for measuring a wedge proportion of a longitudinal pull present within a strip in a longitudinal direction of the strip, wherein the wedge proportion is present across a width of the strip, has a looper shaft and pivot arms each having a first end and a second end, wherein the first ends are connected to the looper shaft. A continuous looper roll extends across the width of the strip and is supported on the second ends of the pivot arms, wherein the looper roll is adjusted relative to the strip by rotation of the looper shaft. Each pivot arm has a looper shaft arm, a looper roll arm, and a joint connecting the looper shaft arm and the looper roll arm to one another. A dynamometer is connected to each pivot arm, wherein the joints of the pivot arms deflect a return force, exerted by the strip onto the looper roll and corresponding to the longitudinal pull, onto the dynamometers, respectively.

Abstract: The invention aims at a method of producing a metal strip on a continuous treatment line comprising a de-scaling station coupled with a cold rolling section. According to the invention, in order to adapt to a change in the production constraints, such as a spool change, the rolling speed is caused to vary on a very wide range down to less than 1 m/min and the cold rolling operation is done between working rolls the diameter of which is so small that, on said whole wide speed variation range, the rolling strength to be applied remains compatible with the product thickness adjustment possibilities, taking the characteristics thereof into account.

Abstract: The invention relates to a Steckel hot rolling mill comprising at least one reversing roll stand (1) as well as coilers (6,7) which are positioned upstream and downstream and present torque-controlled drives. The aim of the invention is to improve such a hot rolling mill in such a way that it optimally counteracts variations in tension and/or mass flow caused by changes in process parameters and allows for high quality hot rolling, especially of very thin hot rolled strips. To this end the invention provides for a looper (8,9) to be positioned between both the coilers (6,7) and the reversible roll stand (1), which supplies actual values for adjusting tension and mass flow.

Abstract: A tandem strip-rolling line has a strip store between the mill so that when the upstream mill is open on the approach of a weld seam joining successive lengths, the downstream mill rolls strip stored in the strip store and conversely when the strip is halted upstream of the second mill, the strip is rolled in the first mill and fed to the strip store.

Abstract: Rolling stock is transported in a transporting device from a front roll stand to a rear roll stand. Between the roll stands, the rolling stock carries out an oscillation transverse to the transporting direction. At least one characteristic property, amplitude or frequency, of the oscillation is determined quantitatively and, from this determination, a tension or compression, existing in the rolling stock between the roll stands is determined. One of the roll stands is readjusted in such a manner, that a desired tension is built up in the rolling stock between the roll stands.

Abstract: The present invention is to provide a tandem cold rolling method conducted by a tandem cold rolling mill, the number of rolling stands of which is not less than 4, wherein a rolling tension, the intensity of which is not lower than 30%, preferably not lower than 40% of the deformation resistance of material to be rolled, is given at least by the final rolling stand. The present invention is also to provide a tandem cold rolling mill satisfying the inequality of JC≧(0.375{overscore (h)}+0.275)JM, wherein the average thickness of a product sheet on the delivery side of the final rolling mill is {overscore (h)}, and an output of one coiler arranged on the delivery side of the tandem cold rolling mill, or a sum of an output of one coiler on the delivery side and an output of the bridle roller on the delivery side is JC, and an output of the main motor of the final rolling stand of the tandem cold rolling mill is JM.

Abstract: A control apparatus for a hot rolling mill having a plurality of rolling stands, including a roll gap tension controller configured to control a roll gap of one of the rolling stands so that a detected interstand tension value of a rolled material positioned between the adjacent rolling stands accords with a target interstand tension value thereof; and a tension width controller configured to control a width of the rolled material by correcting the target interstand tension value.

Abstract: A tension control method for a rolling stock section located between a front roll stand and a rear roll stand of a rolling train, wherein a tensioning element with an actual adjusting force is adjusted relative to the rolling stock section, so that the rolling stock section is deflected by the tensioning element by an actual deflection; the actual adjusting force and the actual deflection are determined; and a tension existing between the front roll stand and the rear roll stand in the rolling stock section is adjusted such that the actual adjusting force approaches a desired adjusting force and/or the actual deflection approaches a desired deflection.

Abstract: A strip threading speed controlling apparatus for a tandem rolling mill is constructed to calculate a speed set value of two adjacent rolling stands by using a forward slip predicted considering a back tension without considering a front tension in an upstream-side rolling stand thereof, and a forward slip predicted without considering the tension in a downstream-side rolling stand, and to calculate the speed set value of each rolling stand by shifting the rolling stands stage by stage.

Abstract: A method of dynamic adjustment of the roll gap in a roll stand of a mill train having multiple stands for rolling a strip, with a strip stock, i.e., a loop, between two roll stands being adjusted or limited by a loop or a strip stock control, with the dynamics in adjustment of the roll gap being limited as a function of state variables of the mill train, in particular state variables of the loop or strip stock control.