CN104923572A - 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

The method of a kind 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 in strip cold mill thickness control system, avoid the eccentric compensation method taked because rolling mill roll bias in upstream causes the cyclic fluctuation of supplied materials thickness.

[background technology]

Known, according to metal rolled technological requirement, strip, the paper tinsel operation of rolling need through hot rolling or casting and cold rolling, the multiple working procedures such as paper tinsel rolls; In practical operation, because roll all may cause roll to occur irregular shape in the process of manufacture, reconditioning, assembling, wearing and tearing or thermal expansion, and roll in irregular shape is easy to cause its axis of rotation and geometry axle center not to fit like a glove, existing hot-rolling mill or casting and rolling machine control system all do not have Roll Eccentricity Compensation function again simultaneously, therefore roll eccentricities phenomenon will be there is in the operation of rolling, thus the thickness of the intermediate products causing hot-rolling mill or casting and rolling machine to be produced produces cyclic fluctuation, and then the thickness of product is made to occur the problem that precision is poor; Under normal circumstances, this cyclic fluctuation contains the radio-frequency component of working roll and backing roll first-harmonic and each harmonic component thereof, on the cold-rolling mill not having entrance calibrator and laser velocimeter, due to pre-control and mass flow control cannot be realized, therefore just cannot eliminate this cyclic fluctuation of supplied materials thickness, thus very adverse influence is produced to the quality of cold-rolled products;

At present, prior art mostly just compensates for the roll eccentricities of cold-rolling mill, and the roll eccentricities of upstream milling train is not compensated, when needing to control the fluctuation of supplied materials thickness, producer is all generally the method adopting pre-control, namely at inlet of rolling mill, calibrator is installed, on entrance rectification roll, rotary pulsed encoder is installed simultaneously, then entrance calibrator is divided into 50 parts to the distance of roll gap, the length that supplied materials passes through measured by the rotary pulsed encoder installed by entrance rectification roll again, when the length that supplied materials passes through reaches a length, just the thick difference data that entrance calibrator is measured is put into the afterbody of the queue of a FIFO, make in queue, to store data and all move forward a unit, now, the thick difference data of queue head is taken out, this thick difference data being entrance calibrator place moves to the thick difference data of supplied materials at roll gap place by the delay of queue, carry it into spring equation, calculating as eliminating the displacement regulated required for the thick poor depress oil cylinder of supplied materials, then driving oil cylinder movement to eliminate the thick difference of supplied materials, although this method can eliminate supplied materials thickness fluctuation accordingly, needing when implementing, at entrance side, calibrator is installed, because its hardware investment is comparatively large, therefore will inevitably increase the production cost of producer.

[summary of the invention]

In order to overcome the deficiency in background technology, the invention discloses the method for a kind of cold-rolling mill upstream rolling mill roll eccentricity compensation, described method can solve the problem of the cold-rolled products thickness and precision difference caused because of the cyclic fluctuation of supplied materials thickness effectively, thus corresponding quality and the yield rate that improve cold-rolled products, and also improve the economic well-being of workers and staff of producer simultaneously.

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

The method of a kind of cold-rolling mill upstream rolling mill roll eccentricity compensation, described method adopts first according to the band arrival line speed that roller diameter and the inlet of rolling mill side speed measuring device of the upstream milling train of rolling supplied materials are measured, calculate the anglec of rotation of upstream rolling mill roll, then the thick difference of band outlet using outlet calibrator to measure is as the signal source analyzed, and obtain the first-harmonic of the wavelength signal identical with upstream rolling mill roll girth and the amplitude of each harmonic component thereof and phase place thereof by Fourier analysis, last amplitude and the phase place calculating required Compensation Regulation amount again, thus to eliminate the cyclic fluctuation of supplied materials thickness, described method implementation step is as follows:

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

B, be N number of subregion by upstream rolling mill roll circumference equal dividing, when the roller rotational angle calculated arrives each subregion, gather corresponding band and export thick difference signal in a buffering area;

C, when being filled with the signal of a roll circumference in buffering area, carrying out a discrete Fourier analysis and calculate, obtain wavelength and equal the first-harmonic of the signal of upstream rolling mill roll girth and the amplitude of each harmonic component thereof and phase place thereof;

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

E, the amplitude of sinusoidal signal utilizing above-mentioned steps to obtain and phase calculation obtain required adjustment amount of roll gap, then according to the amplitude of adjustment amount of roll gap and phase adjusted depress oil cylinder to change roll gap, and eliminate the thick difference of supplied materials.

Further, the roll of the upstream milling train of rolling supplied materials is backing roll or working roll.

Further, during steps A described in enforcement, first measure band inlet velocity degree in real time, then its roll diameter of roller with sliding rate before the upstream milling train measured in advance and upstream milling train is combined, calculate the anglec of rotation of upstream rolling mill roll in real time; 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 _fsliding rate before the milling train of-upstream; D-upstream rolling mill roll diameter; The T-sampling period; Mod represents modulo operation; Wherein, rolling mill roll placed angle in upstream is in radian.

Further, during step B described in enforcement, the roll circumference of upstream milling train is divided into 100-200 subregion, when the roller rotational angle calculated arrives each subregion, gathers band and export thick difference signal in a buffering 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-exports calibrator to roll gap distance; Wherein, phase advance angle is in radian.

Further, the adjustment amount of roll gap in described step e is eliminate the required adjustment amount of roll gap implemented of fundametal compoment, and 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-mill stiffness; K _p-regulate gain; Wherein, upstream rolling mill roll placed angle and phase advance angle are all in radian.

Further, the step e described in enforcement, when second harmonic component eliminated by needs, its computational methods are 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; θ ₂the phase place of-second harmonic component; K _p2-regulate gain.

Owing to adopting technical scheme as above, the present invention has following beneficial effect:

The method of cold-rolling mill upstream of the present invention rolling mill roll eccentricity compensation is applicable to solve the supplied materials thickness fluctuation that cold-rolling mill last process causes, and it does not need on cold-rolling mill, be equipped with the problem that the expensive equipment such as entrance thickness measuring, laser velocimeter just effectively can eliminate the cold-rolled products thickness and precision difference that the cyclic fluctuation of supplied materials thickness causes; Compared with prior art, described method only needs to measure band inlet velocity degree in real time, and combine the front sliding rate measuring upstream milling train in advance, and the roll diameter of roller of upstream milling train, then these information just can be used to calculate the anglec of rotation of upstream rolling mill roll in real time, thus without the need to installing other equipment again additional;

In addition, existing method of carrying out eccentricity compensation to rolling mill roll is all adopt roll-force signal as analyzing the signal source compensated, but when applying, but roll-force signal can not be adopted to the eccentricity compensation of upstream rolling mill roll, this is because the thick difference of supplied materials will be eliminated and regulate roll gap that roll-force fluctuation will be made to amplify further, thus formation positive feedback, cause system cannot steady operation, and described method is the thick difference of band outlet that adopts outlet calibrator the to measure signal source as analysis, therefore it can the stability of safeguards system effectively; Simultaneously, the roll-force signal adopted due to prior art is all real-time, and the restriction exporting calibrator installation site just makes the thick difference of outlet of measurement always delayed, this will produce certain error, and described method adopts first by phase angle that Fourier analysis obtains, band again by measuring in real time enters, outlet linear velocity, and known outlet calibrator calculates advance angle in real time to the distance of roll gap, and then add advance angle with phase angle, thus calculate offset data accurately;

As required, described method can also be applied in tandem mill, for realizing the compensation to the thickness fluctuation that breast roller bias each before it causes at afer bay; Described method not only has small investment, practical advantage when applying, and it correspondingly can also improve quality and the yield rate of cold-rolled products effectively, reaches the object improving producer economic well-being of workers and staff.

[detailed description of the invention]

Can explain the present invention in more detail by the following examples, disclose object of the present invention and be intended to protect all changes and improvements in the scope of the invention, the present invention is not limited to the following examples:

During cold-rolling mill upstream rolling mill roll eccentric compensation method described in enforcement, first according to the roller diameter of the upstream milling train of rolling supplied materials, the band arrival line speed that the diameter of such as backing roll or working roll and inlet of rolling mill side speed measuring device are measured, calculate the anglec of rotation of upstream rolling mill roll, then the thick difference of band outlet using outlet calibrator to measure is as the signal source analyzed, and obtain the first-harmonic of the wavelength signal identical with upstream rolling mill roll girth and the amplitude of each harmonic component thereof and phase place thereof by Fourier analysis, last amplitude and the phase place calculating required Compensation Regulation amount again, thus to eliminate the cyclic fluctuation of supplied materials thickness, described method implementation step is as follows:

A, in real time measure band inlet velocity degree, its roll diameter of roller with sliding rate before the upstream milling train of mensuration and upstream milling train combined, calculates the anglec of rotation of upstream rolling mill roll by following computational methods in real time:

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

In formula: α-upstream rolling mill roll anglec of rotation; v _e-band arrival line speed; S _fsliding rate before the milling train of-upstream; D-upstream rolling mill roll diameter; The T-sampling period; Mod represents modulo operation.

B, be 100-200 subregion by upstream rolling mill roll circumference equal dividing, when the roller rotational angle calculated arrives each subregion, gather corresponding band and export thick difference signal in a buffering area;

C, when being filled with the signal of a roll circumference in buffering area, carrying out a discrete Fourier analysis and calculate, obtain wavelength and equal the first-harmonic of the signal of upstream rolling mill roll girth and the amplitude of each harmonic component thereof and phase place thereof;

D, to have with a certain distance from roll gap due to calibrator, therefore the signal phase obtained by step C is needed to put forward previous angle, the angle of this advance angle can be entered to roll gap distance and the real-time band measured by outlet calibrator, outlet linear velocity calculates, 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-exports calibrator to roll gap distance.

E, the amplitude of sinusoidal signal obtained by above-mentioned steps and phase calculation obtain required adjustment amount of roll gap, then according to the amplitude of adjustment amount of roll gap and phase adjusted depress oil cylinder to change roll gap, and eliminate the thick difference of supplied materials; Wherein, if when the adjustment amount of roll gap implemented is just 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-mill stiffness; K _p-regulate gain;

After calculating the required adjustment amount of roll gap implemented, during as needs elimination second harmonic component, then calculate adjustment amount of roll gap by following computational methods again:

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

In formula: S _e2-for the adjustment amount of roll gap of second harmonic; A _m2the amplitude of-second harmonic component; θ ₂the phase place of-second harmonic component; K _p2-regulate gain; In addition, according to above formula, the adjustment amount of roll gap of more higher harmonic components can just be calculated, the superposition of adjustment amount of roll gap for first-harmonic and each harmonic component thereof can be eliminated implements of its final adjustment amount of roll gap.

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

Claims (7)

1. the method for a cold-rolling mill upstream rolling mill roll eccentricity compensation, it is characterized in that: described method adopts first according to the band arrival line speed that roller diameter and the inlet of rolling mill side speed measuring device of the upstream milling train of rolling supplied materials are measured, calculate the anglec of rotation of upstream rolling mill roll, then the thick difference of band outlet using outlet calibrator to measure is as the signal source analyzed, and obtain the first-harmonic of the wavelength signal identical with upstream rolling mill roll girth and the amplitude of each harmonic component thereof and phase place thereof by Fourier analysis, last amplitude and the phase place calculating required Compensation Regulation amount again, thus to eliminate the cyclic fluctuation of supplied materials thickness, described method implementation step is as follows:

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

B, be N number of subregion by upstream rolling mill roll circumference equal dividing, when the roller rotational angle calculated arrives each subregion, gather corresponding band and export thick difference signal in a buffering area;

C, when being filled with the signal of a roll circumference in buffering area, carrying out a discrete Fourier analysis and calculate, obtain wavelength and equal the first-harmonic of the signal of upstream rolling mill roll girth and the amplitude of each harmonic component thereof and phase place thereof;

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

E, the amplitude of sinusoidal signal utilizing above-mentioned steps to obtain and phase calculation obtain required adjustment amount of roll gap, then according to the amplitude of adjustment amount of roll gap and phase adjusted depress oil cylinder to change roll gap, and eliminate the thick difference of supplied materials.

2. the method for cold-rolling mill upstream according to claim 1 rolling mill roll eccentricity compensation, is characterized in that: the roll of the upstream milling train of rolling supplied materials is backing roll or working roll.

3. the method for cold-rolling mill upstream according to claim 1 rolling mill roll eccentricity compensation, it is characterized in that: during steps A described in enforcement, first measure band inlet velocity degree in real time, again its roll diameter of roller with sliding rate before the upstream milling train measured in advance and upstream milling train is combined, calculate the anglec of rotation of upstream rolling mill roll in real time; Its computational methods are as follows:

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

In formula: α-upstream rolling mill roll anglec of rotation; v _e-band arrival line speed; S _fsliding rate before the milling train of-upstream; D-upstream rolling mill roll diameter; The T-sampling period; Mod represents modulo operation; Wherein, rolling mill roll placed angle in upstream is in radian.

4. the method for cold-rolling mill upstream according to claim 1 rolling mill roll eccentricity compensation, it is characterized in that: during step B described in enforcement, the roll circumference of upstream milling train is divided into 100-200 subregion, when the roller rotational angle calculated arrives each subregion, gather band and export thick difference signal in a buffering area.

5. the method for cold-rolling mill upstream according to claim 1 rolling mill roll eccentricity compensation, is characterized in that: 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-exports calibrator to roll gap distance; Wherein, phase advance angle is in radian.

6. the method for cold-rolling mill upstream according to claim 1 rolling mill roll eccentricity compensation, is characterized in that: the adjustment amount of roll gap in described step e is eliminate the required adjustment amount of roll gap implemented of fundametal compoment, and 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-mill stiffness; K _p-regulate gain; Wherein, upstream rolling mill roll placed angle and phase advance angle are all in radian.

7. the method for cold-rolling mill upstream according to claim 6 rolling mill roll eccentricity compensation, is characterized in that: after calculating adjustment amount of roll gap, and when second harmonic component eliminated by needs, its computational methods are 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; θ ₂the phase place of-second harmonic component; K _p2-regulate gain.