Primetals Technologies Austria Gmbh

Siemens Vai Metals Technologies Gmbh

Voest-alpine Industrieanlagenbau Gmbh & Co.

Georg Keintzel

Günther Winter

Gerald Hohenbichler

Alois Seilinger

Thomas Lengauer

Heinz Fürst

Simon Grosseiber

Franz Hermann Glaser

Jürgen Schiefer

Gernot Grabmair

Kurt Schlacher

Rainer Haas

Helmut Kogler

Armin Stumbauer

Ibrisim Herac

A device for stabilizing of working rollers and back-up rollers of a mill stand that has, for each bending block, first hydraulic pressing units being arranged upstream of the working roller, each first hydraulic pressing unit having a piston with a piston rod and a pressure plate, the piston and the piston rod being integrated in the bending block and the pressure plate being pressable against a working roller chock, and for each stand column, at least one second hydraulic pressing unit, the second hydraulic pressing unit being arranged downstream of the back-up roller and having a piston with a piston rod and a pressure plate, the piston and the piston rod being integrated in the stand column and the pressure plate being pressable against the back-up roller chock, and a first hydraulic pressing unit containing a first oscillation absorber.

Mill stand

A method for controlling movement of a movably mounted body () of a mechanical system (). The mechanical system () includes a drive unit (), which is operated by a medium, and also a control valve (). The movably mounted body () is driven by the drive unit (). A drive movement of the drive unit () is controlled with the aid of the control valve (). In order to avoid or reduce excitation of undesired vibrations in the mechanical system (), it is proposed that the control valve () be actuated using a control signal (u(t)) which comprises a first and also a further switching pulse (S, S) each having a prespecified pulse duration. The pulse duration of the first switching pulse (S) is equal to the pulse duration of the further switching pulse (S). A time difference (&#x394;t) between the start of the first pulse (S) and the start of the further switching pulse (S) is matched to a natural period duration of the mechanical system ().

Method for controlling a movement of a movably mounted body of a mechanical system

A method is disclosed for determining the speed of a rolling stock, for example the belt speed of a rolling belt, wherein electromagnetic radiation in the microwave range is transmitted to the rolling stock by at least one transmitting and receiving device and the belt speed is determined on the basis of the reflected and received reflection signal in an evaluation device. A device for carrying out such method is also disclosed.

Method and device for measuring the speed of a rolling stock

A method and an apparatus for suppression of oscillations in a rolling installation is described. By means of a hydraulic roller engagement third-octave oscillations are effectively suppressed, thus making it possible to improve the quality of the rolled material and/or the productivity of the rolling installation. A manipulated variable is supplied to an electrohydraulic actuating element that acts on at least one hydraulic actuator for the roller engagement and has a rated flow rate of &#x2267;50 l/min. At least a portion of the frequency response at frequencies f&#x2267;80 Hz has a magnitude drop of &#x2266;3 dB, and the phase lag &#x3c6; in this frequency range satisfies the conditions f&#x2267;19&#xb7;{square root over (&#x3c6;)}+3.1&#xb7;10&#xb7;&#x3c6;and &#x3c6;&#x3c;90&#xb0;.

Method and apparatus for suppression of oscillations in a rolling installation

The invention relates to a control method for a mechanical-hydraulic system having a degree of freedom per hydraulic actuator which is embodied as a control path, and a measuring sensor which is used to measure the pressure pof a hydraulic cylinder and a measuring sensor which is used to measure the position xof the piston of the hydraulic cylinder. A control unit which can receive input variables of hydraulic pressure p, and hydraulic actuator position x, is provided. An observer, which determines the desired pressure of the hydraulic system and the speed vof the hydraulic actuator, is implemented in the system. The desired pressure in the control element is taken into account in the set of rules of the control element and the speed vof the hydraulic actuator can be over-ridden for attenuating the control element.

Control method and controller for a mechanohydraulic system

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Steyregg, Austria

Georg Keintzel