CN104923572B - Eccentricity compensation method for cold rolling mill upstream rolling mill roll - Google Patents

Abstract

The invention relates to the field of plate-strip cold rolling mills, and discloses an eccentricity compensation method for a cold rolling mill upstream rolling mill roll. The method comprises the steps that firstly, a rotation angle of an upstream rolling mill roll is calculated; secondly, a strip outlet thickness difference measured by an outlet thickness gauge is used as an analytical signal source, and a fundamental wave of a signal of which the wave length is the same as the perimeter of the upstream rolling mill roll and amplitude values and phase positions of all subharmonic components are obtained through the Fourier analysis; lastly, an amplitude value and phase position of the needed compensation adjustment amount is obtained through calculation. According to the eccentricity compensation method for the cold rolling mill upstream rolling mill roll, the problem that the thickness precision of cold rolling products is poor caused by cyclical fluctuation of the incoming material thickness can be effectively solved, therefore, the quality and the yield of the cold rolling products are correspondingly improved, and meanwhile the economic benefit of producers is improved.

Description

A kind of method of cold-rolling mill upstream rolling mill roll eccentricity compensation

[technical field]

The present invention relates to strip cold mill field, especially relate to a kind of at strip cold mill thickness In control system, it is to avoid because upstream rolling mill roll bias causes supplied materials thickness cyclic fluctuation and take Eccentric compensation method.

[background technology]

Known, according to metal rolled technological requirement, strip, the paper tinsel operation of rolling need to through hot rolling or Casting and cold rolling, the multiple working procedure such as paper tinsel rolls；In practical operation, owing to roll is manufacturing, repairing Grind, assemble, wear and tear or all may result in during thermal expansion roll and irregular shape occurs, And roll in irregular shape easily causes its axis of rotation and geometry axle center can not fit like a glove, with Time existing hot-rolling mill or casting and rolling machine control system the most all there is no Roll Eccentricity Compensation function, therefore will Roll eccentricities phenomenon occurs in the operation of rolling, thus causes the middle product of hot-rolling mill or casting and rolling machine production The thickness of product produces cyclic fluctuation, and then makes the thickness of product the problem that precision is poor occur；Generally In the case of, this cyclic fluctuation contains working roll and supports roller first-harmonic and the frequency of each harmonic component thereof Rate composition, on the cold-rolling mill not having entrance calibrator and laser velocimeter, owing to cannot realize pre-control With quality flow control, this cyclic fluctuation of supplied materials thickness the most just cannot be eliminated, thus to cold rolling The quality of product produces very adverse influence；

At present, prior art mostly roll eccentricities just for cold-rolling mill compensates, and the most right The roll eccentricities of upstream milling train compensates, when needing to be controlled the fluctuation of supplied materials thickness, raw Product side is typically all the method using pre-control, i.e. installs calibrator at inlet of rolling mill, the most inclined at entrance Rotary pulsed encoder is installed on deflector roll, then the distance of entrance calibrator to roll gap is divided into 50 Part, then the length that the rotary pulsed encoder measurement supplied materials installed by entrance rectification roll is passed through, whenever When the length that supplied materials passes through reaches a length, just the thick difference data that entrance calibrator is measured is put into one The afterbody of the queue of individual FIFO, makes to store data in queue and all moves forward a unit；Now, The thick difference data of queue head is taken out, and this is thick difference data the prolonging by queue at entrance calibrator Move to the supplied materials thickness difference data at roll gap late, carry it into spring equation, calculate as eliminating supplied materials The displacement of the required regulation of oil cylinder under thick differential pressure, then drives oil cylinder movement to eliminate the thickness of supplied materials Difference；Although this method can eliminate supplied materials thickness fluctuation accordingly, but needs entering when implementing Calibrator is installed in mouth side, and owing to its hardware investment is relatively big, the production that therefore will necessarily increase producer becomes This.

[summary of the invention]

In order to overcome the deficiency in background technology, the invention discloses a kind of cold-rolling mill upstream rolling mill roll The method of eccentricity compensation, described method can efficiently solve to be made because of supplied materials thickness cyclic fluctuation The problem of the cold-rolled products thickness and precision difference become, thus improve quality and the finished product of cold-rolled products accordingly Rate, and also improve the economic well-being of workers and staff of producer simultaneously.

For achieving the above object, the present invention adopts the following technical scheme that

The method of a kind of cold-rolling mill upstream rolling mill roll eccentricity compensation, described method uses first according to rolling The band arrival line that the roller diameter of the upstream milling train of supplied materials processed and inlet of rolling mill side speed measuring device are measured Speed, calculates the anglec of rotation of upstream rolling mill roll, then uses the band that outlet calibrator is measured Outlet thickness difference is as the signal source analyzed, and obtains wavelength and upstream rolling mill roll by Fourier analysis The first-harmonic of the signal that girth is identical and the amplitude of each harmonic component thereof and phase place thereof, calculate the most again To amplitude and the phase place of required compensation regulated quantity, thus to eliminate the cyclic fluctuation of supplied materials thickness；Institute It is as follows that the method stated implements step:

A, the anglec of rotation of calculating upstream rolling mill roll；

B, it is N number of subregion by upstream rolling mill roll circumference equal dividing, when the roller rotational angle calculated arrives During each subregion, gather in thick difference signal to the relief area of corresponding band outlet；

C, when being filled with the signal of a roll circumference in relief area, carry out a discrete Fourier Analytical calculation, obtains wavelength and divides equal to first-harmonic and each harmonic thereof of the signal of upstream rolling mill roll girth The amplitude of amount and phase place thereof；

D, band by outlet calibrator to roll gap distance and in real time measurement enter, outlet linear velocity meter Calculate and obtain the advance angle of distance signal phase place between calibrator and roll gap；

E, the amplitude of the sinusoidal signal that above-mentioned steps obtains and phase calculation is utilized to obtain required roll gap Regulated quantity, then amplitude and phase adjusted pressure oil cylinder according to adjustment amount of roll gap are to change roll gap, and Eliminate the thick poor of supplied materials.

Further, the roll of the upstream milling train of rolling supplied materials is for supporting roller or working roll.

Further, during step A described in enforcement, measure band arrival line speed the most in real time, then will It combines with the front sliding rate of the upstream milling train of measured in advance and the roll diameter of roller of upstream milling train, counts in real time Calculate the anglec of rotation of upstream rolling mill roll；Its computational methods are as follows:

$\mathrm{\α}=\mathrm{mod}(\mathrm{\Σ}\frac{v_e.2T}{(1+S_f)D},2\mathrm{\π})$

In formula: α-upstream rolling mill roll anglec of rotation；v_e-band arrival line speed；S_f-upstream is rolled Sliding rate before machine；D-upstream rolling mill roll diameter；The T-sampling period；Mod represents modulo operation；Its In, upstream rolling mill roll placed angle is in terms of radian.

Further, during step B described in enforcement, the roll circumference of upstream milling train is divided into 100-200 Individual subregion, when the roller rotational angle calculated arrives each subregion, gathers the thick difference signal of band outlet and arrives In one relief area.

Further, the advance angle computational methods in described step D are as follows:

$\mathrm{\ψ}=\frac{2v_{e}L}{(1+S_f)v_{x}D}$

In formula: ψ-phase advance angle；v_e-band arrival line speed；v_x-band outlet linear velocity； S_fSliding rate before the milling train of-upstream；D-upstream rolling mill roll diameter；L-outlet calibrator is to roll gap distance； Wherein, phase advance angle is in terms of radian.

Further, the adjustment amount of roll gap in described step E is to eliminate the required roller implemented of fundametal compoment Seam regulated quantity, its computational methods are as follows:

$S_e=-A_m\sin (\mathrm{\α}+\mathrm{\θ}+\mathrm{\ψ})\frac{M+K}{K}{K}_p$

In formula: S_e-adjustment amount of roll gap；α-upstream rolling mill roll anglec of rotation；ψ-phase advance angle； A_mThe amplitude of-fundametal compoment；The phase place of θ-fundametal compoment；The plastic stiffness of M-rolled piece；K-rolls Machine rigidity；K_p-regulation gain；Wherein, upstream rolling mill roll placed angle and phase advance angle all with Radian meter.

Further, step E described in enforcement, when needs eliminate second harmonic component, its calculating side Method is as follows:

$S_{e2}={-A}_{m2}\sin (2\mathrm{\α}+{\mathrm{\θ}}_2+2\mathrm{\ψ})\frac{M+K}{K}{K}_{p2}$

In formula: S_e2-for the adjustment amount of roll gap of second harmonic；A_m2The amplitude of-second harmonic component； θ₂The phase place of-second harmonic component；K_p2-regulation gain.

Owing to using technical scheme as above, there is advantages that

The method of cold-rolling mill upstream of the present invention rolling mill roll eccentricity compensation is applicable to solve cold rolling The supplied materials thickness fluctuation that machine last process causes, it need not be equipped with entrance thickness measuring on cold-rolling mill, swash It is cold that the equipment that light kinemometer etc. are expensive just can effectively eliminate that supplied materials thickness cyclic fluctuation caused The problem rolling product thickness low precision；Compared with prior art, described method has only to measure in real time Band arrival line speed, and combine the front sliding rate of measured in advance upstream milling train, and the rolling of upstream milling train Roller roller footpath, is then able to the anglec of rotation using these information to calculate upstream rolling mill roll in real time, Thus without installing other equipment again additional；

Additionally, the existing method that rolling mill roll carries out eccentricity compensation is all to use roll-force signal to make For analyzing the signal source compensated, but in use, the eccentricity compensation of upstream rolling mill roll can not be adopted Use roll-force signal, this is because supplied materials thickness to be eliminated difference and regulate roll gap will make roll-force fluctuate into One step is amplified, thus forms positive feedback, cause system cannot steady operation, and described method is Using the band outlet thickness difference that outlet calibrator is measured as the signal source analyzed, therefore it can be effective The stability of ground safeguards system；Simultaneously as the roll-force signal that prior art uses is all real-time, And the restriction exporting calibrator installation site allow for measure outlet thickness difference the most delayed, this will produce Raw certain error, and described method uses and first passes through the phase angle that Fourier analysis obtains, then lead to The band crossing in real time measurement enters, outlet linear velocity, and known outlet calibrator is to the distance of roll gap It is calculated advance angle in real time, the most again with phase angle plus advance angle, thus is calculated accurately Offset data；

As required, described method can also be applied in tandem mill, for realizing at afer bay Compensation to the thickness fluctuation that breast roller bias each before it causes；Described method application time not But there is small investment, practical advantage, and it can also be effectively improved cold-rolled products accordingly Quality and yield rate, reach improve producer economic well-being of workers and staff purpose.

[detailed description of the invention]

The present invention can be explained in greater detail by the following examples, the open purpose of the present invention is intended to All changes and improvements in the protection scope of the invention, the invention is not limited in the following examples:

During cold-rolling mill upstream rolling mill roll eccentric compensation method described in enforcement, first according to rolling supplied materials The roller diameter of upstream milling train, such as, support roller or the diameter of working roll and inlet of rolling mill side speed measuring device The band arrival line speed measured, calculates the anglec of rotation of upstream rolling mill roll, then uses outlet The band outlet thickness difference that calibrator is measured is as the signal source analyzed, and obtains ripple by Fourier analysis The first-harmonic of the long signal identical with upstream rolling mill roll girth and the amplitude of each harmonic component thereof and Phase place, is calculated the required amplitude compensating regulated quantity and phase place the most again, thus thick to eliminate supplied materials The cyclic fluctuation of degree；It is as follows that described method implements step:

A, in real time measure band arrival line speed, by its front sliding rate with the upstream milling train measured and on The roll diameter of roller of trip milling train combines, and the method that is calculated as follows calculates the rotation of upstream rolling mill roll in real time Gyration:

$\mathrm{\α}=\mathrm{mod}(\mathrm{\Σ}\frac{v_e,2T}{(1+S_f)D},2\mathrm{\π})$

In formula: α-upstream rolling mill roll anglec of rotation；v_e-band arrival line speed；S_f-upstream is rolled Sliding rate before machine；D-upstream rolling mill roll diameter；The T-sampling period；Mod represents modulo operation.

B, it is 100-200 subregion by upstream rolling mill roll circumference equal dividing, when the roller rotational calculated When angle arrives each subregion, gather in thick difference signal to the relief area of corresponding band outlet；

C, when being filled with the signal of a roll circumference in relief area, carry out a discrete Fourier Analytical calculation, obtains wavelength and divides equal to first-harmonic and each harmonic thereof of the signal of upstream rolling mill roll girth The amplitude of amount and phase place thereof；

D, owing to calibrator has with a certain distance from roll gap, therefore need signal phase step C obtained Putting forward previous angle, the angle of this advance angle can be by outlet calibrator to roll gap distance and real-time The band measured enters, outlet linear velocity is calculated, and its computational methods are as follows:

$\mathrm{\ψ}=\frac{2v_{e}L}{(1+S_f)v_{x}D}$

In formula: ψ-phase advance angle；v_e-band arrival line speed；v_x-band outlet linear velocity； S_fSliding rate before the milling train of-upstream；D-upstream rolling mill roll diameter；L-outlet calibrator is to roll gap distance.

E, the amplitude of the sinusoidal signal obtained by above-mentioned steps and phase calculation obtain required roll gap Regulated quantity, then amplitude and phase adjusted pressure oil cylinder according to adjustment amount of roll gap are to change roll gap, and Eliminate the thick poor of supplied materials；Wherein, if the adjustment amount of roll gap implemented is simply for eliminating fundametal compoment, Its computational methods are as follows:

$S_e=-A_m\sin (\mathrm{\α}+\mathrm{\θ}+\mathrm{\ψ})\frac{M+K}{K}{K}_p$

In formula: S_e-adjustment amount of roll gap；α-upstream rolling mill roll anglec of rotation；ψ-phase advance angle； A_mThe amplitude of-fundametal compoment；The phase place of θ-fundametal compoment；The plastic stiffness of M-rolled piece；K-rolls Machine rigidity；K_p-regulation gain；

After calculating the required adjustment amount of roll gap implemented, during if desired for elimination second harmonic component, Be calculated as follows the most again method calculate adjustment amount of roll gap:

$S_{e2}=-A_{m2}\sin (2\mathrm{\α}+{\mathrm{\θ}}_2+2\mathrm{\ψ})\frac{M+K}{K}{K}_{p2}$

In formula: S_e2-for the adjustment amount of roll gap of second harmonic；A_m2The amplitude of-second harmonic component； θ₂The phase place of-second harmonic component；K_p2-regulation gain；Additionally, according to above formula the like, just Can be calculated the adjustment amount of roll gap of higher order harmonics component, its final adjustment amount of roll gap is energy Enough superpositions of the adjustment amount of roll gap that elimination first-harmonic and each harmonic component thereof are implemented.

Part not in the detailed description of the invention is prior art, therefore the present invention is not described in detail.

Claims (7)

1. a method for cold-rolling mill upstream rolling mill roll eccentricity compensation, is characterized in that: described side Test the speed dress for the roller diameter of the first upstream milling train according to rolling supplied materials of method employing and inlet of rolling mill side, upstream Put the band arrival line speed of measurement, calculate the anglec of rotation of upstream rolling mill roll, then use out The band outlet thickness difference that mouth calibrator is measured is as the signal source of analysis, and is obtained by Fourier analysis The first-harmonic of the signal that wavelength is identical with upstream rolling mill roll girth and the amplitude of each harmonic component thereof and Its phase place, is calculated the required amplitude compensating regulated quantity and phase place the most again, thus to eliminate supplied materials The cyclic fluctuation of thickness；It is as follows that described method implements step:

A, the anglec of rotation of calculating upstream rolling mill roll；

B, it is N number of subregion by upstream rolling mill roll circumference equal dividing, when the roller rotational angle calculated arrives During each subregion, gather in thick difference signal to the relief area of corresponding band outlet；

C, when being filled with the signal of a roll circumference in relief area, carry out a discrete Fourier Analytical calculation, obtains wavelength and divides equal to first-harmonic and each harmonic thereof of the signal of upstream rolling mill roll girth The amplitude of amount and phase place thereof；

D, band by outlet calibrator to roll gap distance and in real time measurement enter, outlet linear velocity meter Calculate and obtain the advance angle of distance signal phase place between calibrator and roll gap；

E, the amplitude of the calculated signal of Fourier analysis in above-mentioned steps and phase calculation is utilized to obtain To required adjustment amount of roll gap, then according to the amplitude of adjustment amount of roll gap and phase adjusted pressure oil cylinder with Change roll gap, and eliminate the thick poor of supplied materials.

The method of cold-rolling mill upstream the most according to claim 1 rolling mill roll eccentricity compensation, its Feature is: the roll of the upstream milling train of rolling supplied materials is for supporting roller or working roll.

The method of cold-rolling mill upstream the most according to claim 1 rolling mill roll eccentricity compensation, its Feature is: during step A described in enforcement, measures band arrival line speed the most in real time, then by it with pre- The front sliding rate of the upstream milling train first measured and the roller diameter of upstream milling train combine, and calculate in real time The anglec of rotation of trip rolling mill roll；Its computational methods are as follows:

$\mathrm{\α}=\mathrm{mod}(\mathrm{\Σ}\frac{v_e.2T}{(1+S_f)D},2\mathrm{\π});$

In formula: α-upstream rolling mill roll anglec of rotation；v_e-band arrival line speed；S_f-upstream is rolled Sliding rate before machine；D-upstream rolling mill roll diameter；The T-sampling period；Mod represents modulo operation；Its In, the upstream rolling mill roll anglec of rotation is in terms of radian.

The method of cold-rolling mill upstream the most according to claim 1 rolling mill roll eccentricity compensation, its Feature is: during step B described in enforcement, the roll circumference of upstream milling train is divided into 100-200 Individual subregion, when the roller rotational angle calculated arrives each subregion, gathers the thick difference signal of band outlet and arrives In one relief area.

The method of cold-rolling mill upstream the most according to claim 1 rolling mill roll eccentricity compensation, its Feature is: the advance angle computational methods in described step D are as follows:

$\mathrm{\ψ}=\frac{2v_{e}L}{(1+S_f)v_{x}D};$

In formula: ψ-phase advance angle；v_e-band arrival line speed；v_x-band outlet linear velocity； S_fSliding rate before the milling train of-upstream；D-upstream rolling mill roll diameter；L-outlet calibrator is to roll gap distance； Wherein, phase advance angle is in terms of radian.

The method of cold-rolling mill upstream the most according to claim 1 rolling mill roll eccentricity compensation, its Feature is: the adjustment amount of roll gap in described step E is to eliminate the required roll gap adjustment implemented of fundametal compoment Amount, its computational methods are as follows:

$S_e=-A_m\sin (\mathrm{\α}+\mathrm{\θ}+\mathrm{\ψ})\frac{M+K}{K}{K}_p;$

In formula: S_e-adjustment amount of roll gap；α-upstream rolling mill roll anglec of rotation；ψ-phase advance angle； A_mThe amplitude of-fundametal compoment；The phase place of θ-fundametal compoment；The plastic stiffness of M-rolled piece；K-rolls Machine rigidity；K_p-regulation gain；Wherein, the upstream rolling mill roll anglec of rotation and phase advance angle all with Radian meter.

The method of cold-rolling mill upstream the most according to claim 6 rolling mill roll eccentricity compensation, its Feature is: after calculating adjustment amount of roll gap, when needs eliminate second harmonic component, and its computational methods As follows:

$S_{e2}=-A_{m2}\sin (2\mathrm{\α}+{\mathrm{\θ}}_2+2\mathrm{\ψ})\frac{M+K}{K}{K}_{p2};$

In formula: S_e2-for the adjustment amount of roll gap of second harmonic；A_m2The amplitude of-second harmonic component； θ₂The phase place of-second harmonic component；K_p2-regulation gain.