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Method and apparatus to suppress vibrations in a rolling mill

A technology for rolling equipment and vibration suppression, which is applied in the direction of rolling mill control devices, metal rolling, vibration control, etc., can solve problems such as high energy content, unstable vibration state, etc., and achieve the effect of reducing phase drop

Active Publication Date: 2011-06-01
PRIMETALS TECH AUSTRIA GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Triple-frequency vibrations typically occur in the frequency range from about 80 to 170 Hz and are characterized by high energy contents and unstable vibration states, so that great mechanical damage can also occur on the rolling stands of rolling plants
However, it is not possible to know from this public document the specific implementation or selection criteria for the actuator

Method used

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  • Method and apparatus to suppress vibrations in a rolling mill
  • Method and apparatus to suppress vibrations in a rolling mill
  • Method and apparatus to suppress vibrations in a rolling mill

Examples

Experimental program
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Embodiment Construction

[0034] figure 1 The basic structure of the adjustment object for damping vibrations is shown. The measured variable 2 is supplied via the acceleration sensor 1 connected to the rolls of the rolling stand 12 to a bandpass filter 3 designed as a fourth-order bandpass, which then passes the measured variable, ie The frequency portion of the acceleration signal which is relevant for chatter vibrations is supplied to the regulator 4 . This controller 4 contains a control algorithm and a sub-model characterizing the state of the plant, which calculates in real time at least one time-varying control variable 6 taking into account the filtered measured variable 2 and setpoint variable 5 , which Control variable 6 is supplied to lead / lag element 7 and subsequently to non-linear compensating element 8 . The phase of the signal can be changed by means of the lead / lag element 7 in the particular case of using the manipulated variable 6 . Such a change in phase is particularly advantage...

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PUM

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Abstract

The present invention relates to a method and to an apparatus for suppression of vibrations in a rolling mill. The problem of the invention is to create a method and an apparatus having a hydraulic roller actuator for the suppression of vibrations in a rolling mill, with which in particular the third-octave vibrations can be effectively suppressed and thereby the quality of the rolled material and / or the productivity of the rolling mill can be improved. This problem is solved by a method in which the control variable is supplied to an electro-hydraulic actuating unit and then due to this actuating unit at least one hydraulic actuator for the roller setting is actuated, wherein the electro-hydraulic actuating unit has a nominal rate of flow >= 50 l / min and at least a portion of the frequency response at frequencies f >= 80 Hz is characterized by a drop in value of <= 3 dB, and in this frequency range, the phase drop Phi satisfies the conditions (I) and Phi < 90 DEG.

Description

technical field [0001] The invention relates to a method and a device for damping vibrations in rolling installations. [0002] In particular, the invention relates to a method for damping vibrations, in particular triple frequency vibrations, in a rolling installation having at least one rolling stand provided with a roll hold-down mechanism and at least one roll stack, wherein the At least one continuously measured variable of the rolling plant is supplied to a controller, by means of which a time-varying control variable is ascertained in real time and is determined via the loading of at least one actuator of the roll pressing mechanism. The manipulated variable is kept substantially at a defined target value. Background technique [0003] For rolling plants, especially cold rolling mill trains, it is known that under certain operating conditions such as strip tension, strip tension difference, coefficient of friction, thickness reduction, material strength and strip spe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B37/00
CPCB21B37/007
Inventor G·凯因策尔G·霍亨比克勒
Owner PRIMETALS TECH AUSTRIA GMBH
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