CN102310089B - Method for eliminating local wear of working roller of CVC (continually variable crown) mill - Google Patents

Abstract

The invention relates to the technical field of steel rolling, in particular to a method for eliminating local wear of a working roller of a CVC (continually variable crown) mill, which comprises the following steps: (1) setting the shifting step, the upper bending force compensation limit and the lower bending force compensation limit of the working roller, given that the shifting increment of the working roller deltaD = Delta; (2) calculating the set bending force value F(i) of the ith roll of strip steel; (3) judging whether F(i) exceeds the bending force compensation limit; (4) outputting the set shifting value D(i) and the set bending force value F(i) of the working roller of the ith roll of strip steel; and (5) given that i = i +1,, carrying out presetting calculation of control parameters of a following roll of strip steel sheet. The periodic shifting frequency and amplitude of the working roller can be changed through changing the shifting step, the bending force compensation limits and other parameters, the effects of eliminating the local wear of the working roller and controlling local high points of edges of a hot-rolled sheets can be achieved, the promotion and application on CVC mills of the same category can be easily realized.

Description

A kind of method of eliminating the concentrated wear of CVC operation roll of mill

Technical field

The present invention relates to technical field of steel rolling, be specifically related to the method for a kind of CVC of elimination operation roll of mill concentrated wear.

Background technology

Along with the continuous increase of China's automobile, household electrical appliances demand, automobile, household appliances manufacturing obtain develop rapidly, and the requirement to raw-material every quality index simultaneously also improves constantly.As the primary raw material of automobile, tame electroplax, the strip shape quality of flat cold-rolled sheet has decisive influence to the outward appearance of final automobile, household electrical appliances finished product.The strip shape quality of flat cold-rolled sheet then depends on the strip shape quality of its hot rolling raw material to a great extent.

Local high spot refers to that the obvious phenomenon bigger than normal of thickness appears in lamella thickness in very little width range, belong to the high order flatness defect.Because it is thinner at the cold-rolled process belt steel thickness, the metal lateral flow weakens, the longitudinal extension rate that local high spot band of position steel produces very easily produces local high order shape wave apparently higher than other position, coating, coiling technique and end product quality is afterwards caused have a strong impact on.Therefore, the hot rolling raw material that has a local high spot defective has extremely ill effect to cold rolling end product quality.

Find after deliberation, the formation of SPHC limit portion local high spot mainly is owing to the temperature of strip edge portion in the operation of rolling is lower, and producing contact stress between easy and operation roll of mill concentrates, make working roll produce local heavy wear, the deflection that is in the band steel at working roll heavy wear position in the operation of rolling significantly is lower than other parts, thereby forms local high spot.

Summary of the invention

The object of the present invention is to provide the method for a kind of CVC of elimination operation roll of mill concentrated wear, can control the formation of SPHC limit portion local high spot.

In order to achieve the above object, the technical solution used in the present invention comprises the steps:

(1) sets working roll roll shifting step-length δ (δ＞0mm), bending roller force compensation upper limit F _UL, bending roller force compensation lower limit F _BL, make working roll roll shifting increment Delta D=δ;

When (2) rolling i (i 〉=1) rolls up, working roll roll shifting value is set at D (i)=D (i-1)+Δ D, plate shape control preset model sets value D (i) and works as the carrying roll gap convexity desired value of forebay according to the roll shifting of i (i 〉=1) winding steel, calculates the bending roller force setting value F (i) of i winding steel;

(3) judge whether F (i) exceeds the bending roller force limit of compensation, if F _UL〉=F (i) 〉=F _BL, then D (i), F (i) are preset definite value as the rolling plate shape control parameter of current volume, enter next step; If F (i)＜F _BL, then make working roll roll shifting value increment Delta D=-δ, return previous step; If F (i)＞F _UL, then make working roll roll shifting value increment Delta D=δ, return previous step;

(4) the working roll roll shifting setting value D (i) of output i winding steel and bending roller force setting value F (i);

(5) make i=i+1, enter the calculating that presets of next winding steel plate shape control parameter.

In the such scheme, after the described step (1), also comprise the steps: to judge i (i 〉=1) winding steel in the working roll roller phase the layout order and with on the stand out of a winding steel whether meet periodically roll shifting pattern entry condition of working roll, if meet periodically roll shifting pattern entry condition of working roll, then proceed step (2).

In the such scheme, if i (i 〉=1) winding steel in the working roll roller phase the layout order and with on the stand out of a winding steel do not meet periodically roll shifting pattern entry condition of working roll, described step also comprises the steps: after (1)

A. plate shape control preset model adopts proterotype to carry out plate shape control parameter and sets calculating, draws working roll roll shifting setting value D (i) and the bending roller force setting value F (i) of i (i 〉=1) winding steel;

B. export working roll roll shifting setting value D (i) and the bending roller force setting value F (i) of i winding steel;

C. make i=i+1, enter the calculating that presets of next winding steel plate shape control parameter.

In the such scheme, described working roll periodically roll shifting pattern entry condition is: when rolling the 1st winding steel or current rolled band steel width specifications behind the finishing mill work roll changing and a last winding steel width specifications difference during greater than 100mm, working roll periodically roll shifting pattern cuts out, otherwise working roll periodically roll shifting pattern starts.

In the such scheme, in the described step (1), described working roll roll shifting step-length is set at δ=10mm.

In the such scheme, in the described step (1), the described bending roller force compensation upper limit is set at F _UL=F _MAX-500kN, described bending roller force compensation lower limit set is F _BL=F _MIN+ 400kN, wherein, F _MAXBe the maximum bending roller force that milling train allows, unit is kN, F _MINBe the minimum bending roller force that milling train allows, unit is kN.

In the such scheme, the mill roll-gap convexity of described shape of working roll is regulated the territory and should be met the following conditions:

$\frac{(D_{\mathrm{MAX}}-D_{\mathrm{MIN}})(F_{\mathrm{UL}}-F_{\mathrm{BL}})}{100\mathrm{mm}}\mathrm{\Δ}{C}_F\≤C_{\mathrm{CVC}}\≤\frac{(D_{\mathrm{MAX}}-D_{\mathrm{MIN}})(F_{\mathrm{UL}}-F_{\mathrm{BL}})}{50\mathrm{mm}}\mathrm{\Δ}{C}_F$

Wherein, D _MAXBe the positive roll shifting limiting value that milling equipment allows, unit is mm;

D _MINBe the negative roll shifting limiting value that milling equipment allows, unit is mm;

Δ C _FFor work roll bending the mill roll-gap convexity is regulated and control effect, unit is um/kN;

C _CVCRegulate the territory for the mill roll-gap convexity of working roll CVC roll forming, unit is um.

Compare with the prior art scheme, the beneficial effect that the technical solution used in the present invention produces is as follows:

The present invention not be used in the new computation model of adding in the control system, do not influence the rolling scaduled layout in the production, can can change working roll periodically frequency, the amplitude of roll shifting by changing parameters such as roll shifting step-length, bending roller force compensation limit value, reach the effect of eliminating working roll concentrated wear, control SPHC limit portion local high spot, be implemented in applying in the CVC milling train of the same type easily.

Description of drawings

Fig. 1 is working roll roll shifting amount setting curve figure under the roll shifting pattern periodically in the embodiment of the invention.

Fig. 2 uses preceding working roller abrasion roll shape curve for the embodiment of the invention.

Fig. 3 is the working roller abrasion roll shape curve of the embodiment of the invention after using.

Fig. 4 uses the wide curve of preceding production board for the embodiment of the invention.

Fig. 5 is the production board wide curve of the embodiment of the invention after using.

The specific embodiment

Below in conjunction with drawings and Examples technical solution of the present invention is described in detail.

The embodiment of the invention provides the method for a kind of CVC of elimination operation roll of mill concentrated wear, comprises the steps:

(1) sets working roll roll shifting step-length δ (δ＞0mm), bending roller force compensation upper limit F _UL, bending roller force compensation lower limit F _BL, make working roll roll shifting increment Delta D=δ;

For guaranteeing the periodically effect of roll shifting elimination working roll concentrated wear of working roll, reduce the roll shifting quantitative changeization simultaneously to the influence of plate shape, working roll roll shifting step-length is set at δ=10mm;

For guaranteeing that working roll periodicity roll shifting amplitude can satisfy the needs of eliminating the working roll concentrated wear, be that plate shape FEEDBACK CONTROL is reserved bending roller force adjusting surplus simultaneously, bending roller force is compensated the upper limit be set at F _UL=F _MAX-500kN, bending roller force compensation lower limit set is F _BL=F _MIN+ 400kN, wherein, F _MAXBe the maximum bending roller force that milling train allows, unit is kN, F _MINBe the minimum bending roller force that milling train allows, unit is kN.

(2) judge i (i 〉=1) winding steel in the working roll roller phase the layout order and with on the stand out of a winding steel, if current band steel is that the 1st winding steel rolling behind the finishing mill work roll changing or current rolled band steel width specifications and a last winding steel width specifications difference are greater than 100mm, then working roll periodicity roll shifting pattern is closed, otherwise working roll periodically roll shifting pattern starts;

If working roll periodically roll shifting pattern starts, then carry out step (3), step (4), step (6), step (7) successively;

If working roll periodically roll shifting pattern cuts out, then carry out step (5), step (6), step (7) successively.

When (3) rolling i (i 〉=1) rolls up, working roll roll shifting value is set at D (i)=D (i-1)+Δ D, plate shape control preset model sets value D (i) and works as the carrying roll gap convexity desired value of forebay according to the roll shifting of i (i 〉=1) winding steel, calculates the bending roller force setting value F (i) of i winding steel.

(4) judge whether F (i) exceeds the bending roller force limit of compensation, if F _UL〉=F (i) 〉=F _BL, then D (i), F (i) are preset definite value as the rolling plate shape control parameter of current volume, enter next step; If F (i)＜F _BL, then make working roll roll shifting value increment Delta D=-δ, return the bending roller force setting value F (i) that previous step recomputates i winding steel; If F (i)＞F _UL, then make working roll roll shifting value increment Delta D=δ, return the bending roller force setting value F (i) that previous step recomputates i winding steel.

(5) plate shape control preset model adopts proterotype to carry out plate shape control parameter and sets calculating, draws working roll roll shifting setting value D (i) and the bending roller force setting value F (i) of i (i 〉=1) winding steel.

(6) the working roll roll shifting setting value D (i) of output i winding steel and bending roller force setting value F (i).

(7) make i=i+1, enter the calculating that presets of next winding steel plate shape control parameter.

In the technical solution of the present invention, the mill roll-gap convexity of shape of working roll is regulated the territory and should be met the following conditions:

$\frac{(D_{\mathrm{MAX}}-D_{\mathrm{MIN}})(F_{\mathrm{UL}}-F_{\mathrm{BL}})}{100\mathrm{mm}}\mathrm{\Δ}{C}_F\≤C_{\mathrm{CVC}}\≤\frac{(D_{\mathrm{MAX}}-D_{\mathrm{MIN}})(F_{\mathrm{UL}}-F_{\mathrm{BL}})}{50\mathrm{mm}}\mathrm{\Δ}{C}_F$

Wherein, D _MAXBe the positive roll shifting limiting value that milling equipment allows, unit is mm;

D _MINBe the negative roll shifting limiting value that milling equipment allows, unit is mm;

Δ C _FFor work roll bending the mill roll-gap convexity is regulated and control effect, unit is um/kN;

C _CVCRegulate the territory for the mill roll-gap convexity of working roll CVC roll forming, unit is um.

Apply the present invention to certain the 1580 SPHC production line finishing mill F5 of factory, F6, F7 frame, solve the limit portion local high spot problem of this product of production line.This 1580 SPHC finishing mill F5, F6, the maximum permission of F7 frame working roll bending roller force are 1500kN, the minimum permission of working roll bending roller force is 0kN, work roll bending is about 0.1um/kN to mill roll-gap convexity regulation and control effect, the positive roll shifting limit of working roll is 150mm, and the negative roll shifting limit of working roll is-150mm.

According to technical solution of the present invention, the mill roll-gap convexity of working roll CVC roll forming is regulated the territory and is designed to 300um, and the step of eliminating the concentrated wear of CVC operation roll of mill is as follows:

(1) setting working roll roll shifting step-length δ=10mm, bending roller force compensate to be limited under 1000kN, the bending roller force compensation and are limited to 400kN, make working roll roll shifting increment Delta D=δ.

(2) judge i (i 〉=1) winding steel in the working roll roller phase the layout order and with on the stand out of a winding steel, if current band steel is that the 1st winding steel rolling behind the finishing mill work roll changing or current rolled band steel width specifications and a last winding steel width specifications difference are greater than 100mm, then working roll periodicity roll shifting pattern is closed, otherwise working roll periodically roll shifting pattern starts;

If working roll periodically roll shifting pattern starts, then carry out step (3), step (4), step (6), step (7) successively;

If working roll periodically roll shifting pattern cuts out, then carry out step (5), step (6), step (7) successively.

When (3) rolling i (i 〉=1) rolls up, working roll roll shifting value is set at D (i)=D (i-1)+Δ D, plate shape control preset model sets value D (i) and works as the carrying roll gap convexity desired value of forebay according to the roll shifting of i (i 〉=1) winding steel, calculates the bending roller force setting value F (i) of i winding steel.

(4) judge whether F (i) exceeds the bending roller force limit of compensation, if 1000kN 〉=F (i) 〉=400kN then presets definite value with D (i), F (i) as the rolling plate shape control parameter of current volume, enter next step; If F (i)＜400kN then makes working roll roll shifting value increment Delta D=-δ, return the bending roller force setting value F (i) that previous step recomputates i winding steel; If F (i)＞1000kN then makes working roll roll shifting value increment Delta D=δ, return the bending roller force setting value F (i) that previous step recomputates i winding steel.

(5) plate shape control preset model adopts proterotype to carry out plate shape control parameter and sets calculating, draws working roll roll shifting setting value D (i) and the bending roller force setting value F (i) of i (i 〉=1) winding steel.

(6) the working roll roll shifting setting value D (i) of output i winding steel and bending roller force setting value F (i).

(7) make i=i+1, enter the calculating that presets of next winding steel plate shape control parameter.

The present invention uses back this production line F5, F6, F7 frame working roll has been realized periodically roll shifting, as shown in Figure 1.Comparison diagram 2, Fig. 3 working roll concentrated wear phenomenon have as can be seen obtained obvious improvement.Comparison diagram 4, Fig. 5 can find that the limit portion local high spot problem of SPHC product has obtained effective solution.

The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (5)

1. a method of eliminating the concentrated wear of CVC operation roll of mill is characterized in that, comprises the steps:

(1) sets working roll roll shifting step-length δ, bending roller force compensation upper limit F _UL, bending roller force compensation lower limit F _BL, make working roll roll shifting increment Delta D=δ, described working roll roll shifting step-length δ＞0mm;

(2) judge i winding steel in the working roll roller phase the layout order and with on the stand out of a winding steel whether meet periodically roll shifting pattern entry condition of working roll, described i 〉=1;

If meet periodically roll shifting pattern entry condition of working roll, then carry out following step:

When a. rolling i rolls up, working roll roll shifting value is set at D (i)=D (i-1)+Δ D, plate shape control preset model sets value D (i) and works as the carrying roll gap convexity desired value of forebay according to the roll shifting of i winding steel, calculates the bending roller force setting value F (i) of i winding steel;

B. judge whether F (i) exceeds the bending roller force limit of compensation, if F _UL〉=F (i) 〉=F _BL, then D (i), F (i) are preset definite value as the rolling plate shape control parameter of current volume, enter next step; If F (i)＜F _BL, then make working roll roll shifting value increment Delta D=-δ, return previous step; If F (i)＞F _UL, then make working roll roll shifting value increment Delta D=δ, return previous step;

If do not meet periodically roll shifting pattern entry condition of working roll, then carry out following step:

Plate shape control preset model adopts proterotype to carry out plate shape control parameter and sets calculating, draws working roll roll shifting setting value D (i) and the bending roller force setting value F (i) of i winding steel;

(3) the working roll roll shifting setting value D (i) of output i winding steel and bending roller force setting value F (i);

(4) make i=i+1, enter the calculating that presets of next winding steel plate shape control parameter.

2. the method for elimination as claimed in claim 1 CVC operation roll of mill concentrated wear, it is characterized in that, described working roll periodically roll shifting pattern entry condition is: when rolling the 1st winding steel or current rolled band steel width specifications behind the finishing mill work roll changing and a last winding steel width specifications difference during greater than 100mm, working roll periodically roll shifting pattern cuts out, otherwise working roll periodically roll shifting pattern starts.

3. the method for elimination CVC operation roll of mill as claimed in claim 1 concentrated wear is characterized in that in the described step (1), described working roll roll shifting step-length is set at δ=10mm.

4. the method for elimination CVC operation roll of mill as claimed in claim 1 concentrated wear is characterized in that, in the described step (1), the described bending roller force compensation upper limit is set at F _UL=F _MAX-500kN, described bending roller force compensation lower limit set is F _BL=F _MIN+ 400kN, wherein, F _MAXBe the maximum bending roller force that milling train allows, unit is kN, F _MINBe the minimum bending roller force that milling train allows, unit is kN.

5. the method for elimination CVC operation roll of mill as claimed in claim 1 concentrated wear is characterized in that, the mill roll-gap convexity adjusting territory of described shape of working roll should meet the following conditions:

$\frac{(D_{\mathrm{MAX}}-D_{\mathrm{MIN}})(F_{\mathrm{UL}}-F_{\mathrm{BL}})}{100\mathrm{mm}}\mathrm{\Δ}{C}_F\≤C_{\mathrm{CVC}}\≤\frac{(D_{\mathrm{MAX}}-D_{\mathrm{MIN}})(F_{\mathrm{UL}}-F_{\mathrm{BL}})}{50\mathrm{mm}}\mathrm{\Δ}{C}_F$

Wherein, D _MAXBe the positive roll shifting limiting value that milling equipment allows, unit is mm;

D _MINBe the negative roll shifting limiting value that milling equipment allows, unit is mm;

Δ C _FFor work roll bending the mill roll-gap convexity is regulated and control effect, unit is um/kN;

C _CVCRegulate the territory for the mill roll-gap convexity of working roll CVC roll forming, unit is um.

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