CN103302105B - The cooperative control method of a kind of cold-strip steel edge crease defect and edge thickness - Google Patents

The cooperative control method of a kind of cold-strip steel edge crease defect and edge thickness Download PDF

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CN103302105B
CN103302105B CN201310238907.7A CN201310238907A CN103302105B CN 103302105 B CN103302105 B CN 103302105B CN 201310238907 A CN201310238907 A CN 201310238907A CN 103302105 B CN103302105 B CN 103302105B
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edge portion
edge
steel
thinning
steel edge
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CN103302105A (en
Inventor
李广林
范正军
余威
王路兵
赵运攀
张亮
陈伟
侍爱臣
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Shougang Zhixin Qian'an Electromagnetic Material Co., Ltd.
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Beijing Shougang Co Ltd
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Abstract

The invention discloses the cooperative control method of a kind of cold-strip steel edge crease defect and edge thickness, comprising: obtain hot rolling raw material local high spot and receive standard; Receive standard according to local high spot, the deviate that the thinning desired value of calculating steel edge portion, edge thinning allow and edge thicken desired value relatively; The deviate allowed according to the thinning desired value of steel edge portion, edge thinning and edge thicken desired value relatively, judge whether steel edge portion is in edge thinning state, edge thickening state and edge and relatively thickens state; Obtain working roll roll shifting regulated quantity according to steel edge portion status, realize the adjustment to steel edge portion status.The present invention, in actual application, is thickened with relative by control cincture steel edge thickening, solves the crease defect problem that cold-strip steel edge occurs; Simultaneously on the basis of guaranteeing not border crease defect, take into account the control that steel edge portion thickness is thinning, reduced steel edge portion thinning, reduced trimming amount and production cost.

Description

The cooperative control method of a kind of cold-strip steel edge crease defect and edge thickness
Technical field
The invention belongs to technical field of steel rolling, particularly the cooperative control method of a kind of cold-strip steel edge crease defect and edge thickness.
Background technology
Steel edge portion crease defect directly affects the presentation quality of band steel, still visual after coating, and serious then normally cannot use and need to do excision process, thus reduces the lumber recovery of band steel.
By researching and analysing of the cold rolling data of rolling up wrinkle, find all there is edge thickening phenomenon to a certain degree at steel edge portion.After steel edge portion sharply thickens, the irregular section convexity of cat ear shape of appearance, edge is than thick middle, and cause transverse gage and the internal stress cross direction profiles inequality of band steel, the part internal stress that namely steel edge portion is relatively thick is also relatively large.In continuous annealing during heating and cooling, all than comparatively fast, there is unbalanced expanding with heat and contract with cold in one side band steel edge part comparatively centre temperature rise temperature drop; Steel edge portion fully discharges (edge Stress Release resistance is little) compared with large internal stress on the other hand, and both superpositions make steel edge portion generation local yielding, the plastic deformation uneven when exceeding yield point, namely produces edge crease defect.
Curve falls in the hot rolling raw material curve rolled up by contrast wrinkle and cold rolling limit, find to cause the main cause of cold-strip steel edge thickening to have two: one to be that corresponding hot rolling raw material exists edge thickening defect, and also there is corresponding local high spot because of raw material heredity in corresponding cold-strip steel edge; Two is in cold-rolled process, produces under steel edge portion law of metal flow and roller chamfering comprehensive function.
But in cold rolled strip steel production, due to the existence of roll flexural deformation amount of deflection and the impact of incoming hot rolled slab convexity, inevitably cause that to roll rear steel edge portion thickness thinning, and affect the processing of electrical sheet lamination because steel edge portion is thinning and use, so in actual production, control cincture steel edge thinning becomes the Focal point and difficult point of each cold rolling mill technique tackling key problem.But do not recognize that steel edge portion thickens the impact on cold-rolled products quality, thus ignore the prevention and corntrol that steel edge portion is thickened.And thinning for reducing steel edge portion, in control procedure, create edge thickening to a certain degree.
Summary of the invention
Technical problem to be solved by this invention is to provide the cooperative control method of a kind of cold-strip steel edge crease defect and edge thickness, can realize control cincture steel edge thickening, thinning and relatively thicken, solve the problem that crease defect appears in cold-strip steel edge.
For solving the problems of the technologies described above, the invention provides the cooperative control method of a kind of cold-strip steel edge crease defect and edge thickness, comprising: obtain hot rolling raw material local high spot and receive standard; Receive standard according to described local high spot, the deviate that the thinning desired value of calculating steel edge portion, edge thinning allow and edge thicken desired value relatively; The deviate allowed according to the thinning desired value of described steel edge portion, edge thinning and edge thicken desired value relatively, judge whether described steel edge portion is in edge thinning state, edge thickening state and edge and relatively thickens state; Obtain working roll roll shifting regulated quantity according to described steel edge portion status, realize the adjustment to described steel edge portion status.
Further, the computing formula of described calculating hot rolling raw material local high spot reception standard is:
l=λ δ·λ L·(H-h)/H;
Wherein, l: described raw material local high spot receives standard; λ δ: described band steel yield strength factor of influence; λ l: described raw material local high spot is apart from the factor of influence of described steel edge portion length; H: described raw material target thickness; H: described band steel target thickness.
Further, the computing formula of the thinning desired value of described calculating steel edge portion is:
SPC T=4·λ δ·h·0.1%;
Wherein, SPC t: the thinning desired value of described steel edge portion; λ δ: described band steel yield strength factor of influence; H: described band steel target thickness.
Further, the computing formula of the deviate of the thinning permission of described calculating steel edge portion is:
SPC D=(6-λ δ)·h·0.1%;
Wherein, SPC d: the departure of the thinning permission of described steel edge portion; λ δ: described band steel yield strength factor of influence; H: described band steel target thickness.
Further, the computing formula that described calculating steel edge portion thickens desired value is relatively:
h T=(5-λ δ)·h·0.1%;
Wherein, h t: described steel edge portion thickens desired value relatively; λ δ: described band steel yield strength factor of influence; H: described band steel target thickness.
Further, described λ δcomputing formula be:
λ δ=1+(δ-260)/60;
Wherein, δ: the average yield strength of described band steel steel grade.
Further, described λ δcomputing formula be:
λ δ=2-(δ-260)/60;
Wherein, δ: the average yield strength of described band steel steel grade.
Further, if when described raw material local high spot is within apart from described steel edge portion 60mm, then λ l=+∞; If described raw material local high spot apart from beyond described steel edge portion 60mm time, then λ l=10.
Further, describedly judge whether steel edge portion is in edge thinning state, edge thickening state and edge and relatively thickens state and specifically comprise:
Calculate the actual thinning value of described steel edge portion:
h e = ( h χ 1 + h χ 2 ) / 2 - h c ;
What calculate described steel edge portion reality thickens value relatively:
h s = ( h χ 3 + h χ 4 ) / 2 - ( h χ 1 + h χ 2 ) / 2 ;
If h e> SPC t+ SPC d, then described steel edge portion is in thinning state;
If h e< SPC t-SPC d, then described steel edge portion is in the state of thickening;
If h s> h t, then described steel edge portion is in and relatively thickens state;
Wherein, h e: the actual thinning value of described steel edge portion; h c: the central spot actual (real) thickness deviate of described band steel; h s: described steel edge portion reality thickens value relatively; described steel edge portion χ 1position actual (real) thickness deviate; described steel edge portion χ 2position actual (real) thickness deviate; described steel edge portion χ 3position actual (real) thickness deviate; described steel edge portion χ 4position actual (real) thickness deviate; χ 1< χ 2< χ 3< χ 4.
Further, described according to steel edge portion status acquisition working roll roll shifting regulated quantity, realize specifically comprising the adjustment of described steel edge portion status:
If described steel edge portion is in edge thinning state or edge thickening state, then:
According to formula sf2 n=(h e-SPC t) × λ n/ (λ 1+ λ 2) × λ n/ 10 calculate described working roll roll shifting regulated quantity, and are regulated the n-th frame in described roll shifting control system by described working roll roll shifting regulated quantity;
If described steel edge portion is in edge and relatively thickens state, then:
According to formula sf1=(h s-h t) the described working roll roll shifting regulated quantity of 4 calculating, and by described working roll roll shifting regulated quantity, the 3rd frame in described roll shifting control system is regulated;
Wherein, sf2 n: the working roll roll shifting regulated quantity of the n-th frame; The working roll roll shifting regulated quantity of the sf1: the 3 frame; λ 1: the 1st frame load weight; λ 2: the 2nd frame load weight; λ n: the n-th frame load weight; N=1 or 2.
The cooperative control method of a kind of cold-strip steel edge crease defect provided by the invention and edge thickness, first calculates hot rolling raw material local high spot and receives standard; Then calculate steel edge portion thinning desired value, deviate that edge thinning allows and edge thicken desired value relatively; Judge whether steel edge portion is in edge thinning state, edge thickening state and edge and relatively thickens state again; Eventually through roll shifting control system evaluation work roller roll shifting regulated quantity, and the state at steel edge portion is regulated, the present invention is thickened with relative by control cincture steel edge thickening in actual application, solves the crease defect problem that cold-strip steel edge occurs; Simultaneously on the basis of guaranteeing not border crease defect, take into account the control that steel edge portion thickness is thinning, farthest reduced steel edge portion thinning, reduced trimming amount and production cost.
Accompanying drawing explanation
The cooperative control method process chart of a kind of cold-strip steel edge crease defect that Fig. 1 provides for the embodiment of the present invention and edge thickness.
Detailed description of the invention
Below in conjunction with accompanying drawing, detailed description of the invention provided by the invention is described in further detail.
See Fig. 1, a kind of cold-strip steel edge crease defect that the embodiment of the present invention provides and the cooperative control method of edge thickness, comprise the steps:
Step S101: obtain hot rolling raw material local high spot and receive standard 101;
Step S102: receive standard according to local high spot, the deviate that the thinning desired value of calculating steel edge portion, edge thinning allow and edge thicken desired value 102 relatively;
Step S103: the deviate allowed according to the thinning desired value of steel edge portion, edge thinning and edge thicken desired value relatively, judge whether steel edge portion is in edge thinning state, edge thickening state and edge and relatively thickens state 103;
Step S104: obtain working roll roll shifting regulated quantity according to steel edge portion status, realize the adjustment 104 to steel edge portion status.
In the present embodiment, the computing formula calculating hot rolling raw material local high spot reception standard is:
l=λ δ·λ L·(H-h)/H;
Wherein, l: raw material local high spot receives standard; λ δ: band steel yield strength factor of influence; λ l: the factor of influence of raw material local high spot distance steel edge portion length; H: raw material target thickness; H: band steel target thickness.
And when raw material local high spot is within distance steel edge portion 60mm, then λ l=+∞; When raw material local high spot apart from beyond described steel edge portion 60mm time, then λ l=10.
In the present embodiment, the computing formula calculating the thinning desired value of steel edge portion is:
SPC T=4·λ δ·h·0.1%;
Wherein, SPC t: the thinning desired value of steel edge portion; λ δ: band steel yield strength factor of influence; H: band steel target thickness.
In the present embodiment, the computing formula calculating the deviate of the thinning permission of steel edge portion is:
SPC D=(6-λ δ)·h·0.1%;
Wherein, SPC d: the departure of the thinning permission of steel edge portion; λ δ: band steel yield strength factor of influence; H: band steel target thickness.
In the present embodiment, the computing formula that calculating steel edge portion thickens desired value is relatively:
h T=(5-λ δ)·h·0.1%;
Wherein, h t: steel edge portion thickens desired value relatively; λ δ: band steel yield strength factor of influence; H: band steel target thickness.
Steel yield strength factor of influence computing formula is with to may be defined as λ in the present embodiment step S101 δ=1+ (δ-260)/60;
Wherein, λ δ: yield strength factor of influence, radix is 1, and corresponding average yield strength is 260; δ: band steel steel grade average yield strength.
Steel yield strength factor of influence computing formula is with to may be defined as λ in the present embodiment step S102 δ=2-(δ-260)/60;
Wherein, λ δ: yield strength factor of influence, radix is 2, and corresponding average yield strength is 260; δ: band steel steel grade average yield strength.
The present embodiment for calculate in step S101 hot rolling raw material local high spot receive standard, can see following example 1.-2. described in:
1., the average yield strength of a certain steel grade is 290, and raw material target thickness is 2.5mm, and finished product target thickness is 0.5mm, and the length of raw material local high spot distance steel edge portion is 100mm, then:
Yield strength factor of influence λ δ=1+ (δ-260)/60
=1+(290-260)/60
=1.5
Wherein, the factor of influence λ of the length of local high spot distance steel edge portion l=10; Then,
Raw material local high spot receives standard l=λ δλ l(H-h)/H
=1.5×10×(2.5-0.5)/2.5
=12(mm)
2., the average yield strength of a certain steel grade is 290, and raw material target thickness is 2.5mm, and finished product target thickness is 0.5mm, and the length of raw material local high spot distance steel edge portion is 30mm, then:
Yield strength factor of influence λ δ=1+ (δ-260)/60
=1+(290-260)/60
=1.5
Wherein, the factor of influence λ of the length of local high spot distance steel edge portion l=+∞
Raw material local high spot receives standard l=λ δλ l(H-h)/H
=1.5×(+∞)×(2.5-0.5)/2.5
=+∞(mm)
Namely, when raw material local high spot is within distance steel edge portion 60mm, the local high spot of any height can accept; When raw material local high spot is beyond distance steel edge portion 60mm, the reception standard of local high spot and the yield strength direct proportionality of steel grade.
Norm constraint hot rolling raw material is received by calculating hot rolling raw material local high spot in step S101 in the present embodiment, when hot rolling raw material local high spot exceeds the standard calculated according to this algorithm, close at hot-rolled process with regard to needs, do not allow to transport to cold rolling process to produce, so also would not produce edge wrinkle, thus from hot rolling source, edge wrinkle be checked on.
The present embodiment for calculate in step S102 the thinning desired value of steel edge portion, edge thinning allow deviate and edge relatively thicken desired value, can see following example 3. described in:
3., the average yield strength of a certain steel grade is 260, and raw material target thickness is 2.5mm, and finished product target thickness is 0.5mm, then:
Its yield strength factor of influence λ δ=2-(δ-260)/60=2
Its edge thinning desired value SPC t=4 λ δh0.1%
=4×2×0.5×0.1%=4um
The departure SPC that its edge thinning allows d=(6-λ δ) h0.1%
=(6-2)×0.5×0.1%=2um
Its edge thickens desired value h relatively t=(5-λ δ) h0.1%
=(5-2)×0.5×0.1%=1.5um
In the present embodiment, step S102 is by balancing band steel edge thickening and thinning presetting system, according to example 3. Computational Methods, first according to raw material yield strength, band steel target thickness calculates edge thinning desired value, the departure allowed thickens desired value with relative, allow milling train operation according to the reception standard of the raw material local high spot of different steel grade simultaneously, profiled outline quality and finished strip are to the demand of edge thinning, by the desired value of band steel both sides edge thinning in system desired by operation screen input and the departure of permission, also allow the desired value of input tape steel both sides edge thickening simultaneously, and preset first three frame (five frames are set in production line, band steel passes through successively from the 1st to the 5th successively, first three frame is: the 1st frame, 2nd frame, 3rd frame) roll shifting pre-set, thus the relation having balanced the thinning of steel edge portion thickness and thickened.
In the present embodiment step S103, judge whether steel edge portion is in edge thinning state, edge thickening state and edge and relatively thickens state and specifically comprise:
Calculate the actual thinning value of steel edge portion:
h e = ( h &chi; 1 + h &chi; 2 ) / 2 - h c ;
What calculate steel edge portion reality thickens value relatively:
h s = ( h &chi; 3 + h &chi; 4 ) / 2 - ( h &chi; 1 + h &chi; 2 ) / 2 ;
If h e> SPC t+ SPC d, then steel edge portion is in thinning state;
If h e< SPC t-SPC d, then steel edge portion is in the state of thickening;
If h s> h t, then steel edge portion is in and relatively thickens state;
Wherein, h e: the actual thinning value of steel edge portion; h c: the central spot actual (real) thickness deviate of band steel; h s: steel edge portion reality thickens value relatively; steel edge portion χ 1position actual (real) thickness deviate; steel edge portion χ 2position actual (real) thickness deviate; steel edge portion χ 3position actual (real) thickness deviate; steel edge portion χ 4position actual (real) thickness deviate; χ 1< χ 2< χ 3< χ 4.
In the present embodiment, for ease of describing technical scheme provided by the present invention in detail, the following stated band steel both sides comprise band steel active side and band steel driving side, calculate with roll shifting regulable control process in roll shifting regulated quantity, top working roll roll shifting control cincture steel active side edge thickness, bottom working roll roll shifting control cincture steel driving side edge thickness.
Preferably, χ 1=15, χ 2=20, χ 3=30, χ 4=40, namely whether the present embodiment step S103 can exist thinning situation according to being with the mean value of steel central spot thickness deviation and band steel both sides edge 15mm and 20mm place thickness deviation to identify edge; And according to the mean value of band steel both sides edge 30mm and 40mmmm place thickness deviation be with the mean value of steel both sides edge 15mm and 20mm place thickness deviation to identify edge whether to exist and relatively thicken situation.
The present embodiment for judging in step S103 whether steel edge portion is in edge thinning state, edge thickening state and edge and relatively thickens state, can see following example 4. described in:
4., a certain coiled strip steel, the average yield strength of its raw material is 260, and raw material target thickness is 2.5mm, and finished product target thickness is 0.5mm.In the operation of rolling, the thickness deviation values at active side edge 15,20,30 and 40mm place is respectively 7um, 6um, 4um and 3um, and the thickness deviation of band steel central spot is 0um, then:
Its yield strength factor of influence λ δ=2-(δ-260)/60=2
Its edge thinning desired value SPC t=4 λ δh0.1%
=4×2×0.5×0.1%=4um
The departure SPC that its edge thinning allows d=(6-λ δ) h0.1%
=(6-2)×0.5×0.1%=2um
Its edge thickens desired value h relatively t=(5-λ δ) h0.1%
=(5-2)×0.5×0.1%=1.5um
The actual thinning value h of its steel edge portion e=(h 15+ h 20)/2-h c
=(7+6)/2-0=6.5um
Steel edge portion reality relatively thicken value h s=(h 30+ h 40)/2-(h 15+ h 20)/2
=(4+3)/2-(7+6)/2=-3um
By can be calculated SPC above t+ SPC d=4um+2um=6um
The Rule of judgment h of thinning state is in by steel edge portion e> SPC t+ SPC dknown, band steel active side edge is in thinning state; The Rule of judgment h relatively thickening state is in by steel edge portion s> h tknown, band steel active side edge is not in and relatively thickens state.
In the present embodiment step S104, by roll shifting control system evaluation work roller roll shifting regulated quantity, and the state at steel edge portion regulated specifically comprise:
If steel edge portion is in edge thinning state or edge thickening state, then:
According to formula sf2 n=(h e-SPC t) × λ n/ (λ 1+ λ 2) × λ n/ 10 evaluation work roller roll shifting regulated quantitys, and by working roll roll shifting regulated quantity, the n-th frame in described roll shifting control system is regulated;
If steel edge portion is in edge and relatively thickens state, then:
According to formula sf1=(h s-h t) 4 evaluation work roller roll shifting regulated quantitys, and by working roll roll shifting regulated quantity, the 3rd frame in roll shifting control system is regulated;
Wherein, sf2 n: the working roll roll shifting regulated quantity of the n-th frame; The working roll roll shifting regulated quantity of the sf1: the 3 frame; λ 1: the 1st frame load weight; λ 2: the 2nd frame load weight; λ n: the n-th frame load weight; N=1 or 2.
In the present embodiment step S104, roll shifting control system is with C-D aveedge Drop Control pattern is the roll shifting control system of core, according to identifying that steel edge portion thickens the actual conditions of the band steel both sides edge thickness identified with thinning evaluation module, in by regulating the working roll roll shifting of corresponding frame, steel edge portion thickness is in preset thinning and the control range thickened.
The present embodiment obtains working roll roll shifting regulated quantity in step S104 according to steel edge portion status, realizes the adjustment to steel edge portion status, can see following example 5. described in:
5., a certain coiled strip steel, the average yield strength of its raw material is 260, and raw material target thickness is 2.5mm, and finished product target thickness is 0.5mm.In the operation of rolling, the thickness deviation values at active side edge 15,20,30 and 40mm place is respectively 4um, 3um, 7um and 6um, the thickness deviation values at driving side edge 15,20,30 and 40mm place is respectively 7um, 6um, 4um and 3um and is with the thickness deviation of steel central spot to be 0um, then:
Its yield strength factor of influence λ δ=2-(δ-260)/60=2;
Its edge thinning desired value SPC t=4 λ δh0.1%
=4×2×0.5×0.1%=4um;
The departure SPC that its edge thinning allows d=(6-λ δ) h0.1%
=(6-2)×0.5×0.1%=2um;
Its edge thickens desired value h relatively t=(5-λ δ) h0.1%
=(5-2)×0.5×0.1%=1.5um;
The actual thinning value h of its active side edge we=(h w15+ h w20)/2-h c
=(3+4)/2–0=3.5um;
The actual thinning value h of its driving side edge de=(h d15+ h d20)/2-h c
=(7+6)/2–0=6.5um;
Its active side edge reality relatively thicken value:
h ws=(h w30+h w40)/2-(h w15+h w20)/2
=(7+6)/2–(4+3)/2=3um;
Its driving side edge reality relatively thicken value:
h ds=(h d30+h d40)/2-(h d15+h d20)/2
=(4+3)/2–(6+7)/2=-3um;
By can be calculated SPC above t+ SPC d=4um+2um=6um
SPC T-SPC D=4um–2um=2um;
By the Rule of judgment h of steel edge portion state e> SPC t+ SPC dwith h e< SPC t-SPC dknown, band steel driving side edge is in thinning state, and is with steel active side to be in controllable state;
Then the first two frame bottom working roll roll shifting regulated quantity is respectively:
sf2 1low=(h de-SPC T)×λ 1/(λ 12)×λ 1/10
=(6.5–4)×60/(60+50)×60/10≈8(mm)
sf2 2low=(h de-SPC T)×λ 2/(λ 12)×λ 2/10
=(6.5–4)×50/(60+50)×50/10≈6(mm)
The Rule of judgment h relatively thickening state is in by steel edge portion s> h tknown, band steel active side edge is in and relatively thickens state, and is with steel driving side edge not to be in relatively to thicken state.
Then the 3rd frame top working roll roll shifting regulated quantity:
sf1 up=(h ws-h T)·4
=(3–1.5)×4=6(mm)
Then roll shifting control system is carried out first time roll shifting according to the top working roll of roll shifting regulated quantity to the 3rd frame calculated and is regulated.After first time, roll shifting was adjusted, if the thickness of band steel active side edge is still in relatively thicken state, then carry out the second order 3 frame top working roll roll shifting regulated quantity to calculate, then roll shifting control system is carried out second time roll shifting according to the top working roll of roll shifting regulated quantity to the 3rd frame calculated and is regulated.After second time roll shifting is adjusted, if the thickness of steel edge portion the same side is still in relatively thicken state, then repeat aforesaid operations by that analogy, be not in until this side steel edge portion thickness and relatively thicken state or till reaching the roll shifting limit.
Meanwhile, roll shifting control system carries out first time roll shifting adjustment according to the bottom working roll roll shifting regulated quantity of the first two frame (the 1st frame, the 2nd frame) calculated to the first two frame.After first time, roll shifting was adjusted, if the thickness of band steel driving side edge is still in thinning state, the bottom working roll roll shifting regulated quantity of then carrying out second time the first two frame calculates, and then roll shifting control system is carried out second time roll shifting according to the roll shifting regulated quantity calculated to the first two frame and regulated.After second time roll shifting is adjusted, if the thickness of band steel driving side edge is still in thinning state, then repeat aforesaid operations by that analogy, be not in thinning state or till reaching the roll shifting limit until this side steel edge portion thickness.
The cooperative control method of a kind of cold-strip steel edge crease defect provided by the invention and edge thickness, first calculates hot rolling raw material local high spot and receives standard; Then calculate steel edge portion thinning desired value, deviate that edge thinning allows and edge thicken desired value relatively; Judge whether steel edge portion is in edge thinning state, edge thickening state and edge and relatively thickens state again; Eventually through roll shifting control system evaluation work roller roll shifting regulated quantity, and the state at steel edge portion is regulated, the present invention is thickened with relative by control cincture steel edge thickening in actual application, solves the crease defect problem that cold-strip steel edge occurs; Simultaneously on the basis of guaranteeing not border crease defect, take into account the control that steel edge portion thickness is thinning, farthest reduced steel edge portion thinning, reduced trimming amount and production cost.
It should be noted last that, above detailed description of the invention is only in order to illustrate technical scheme of the present invention and unrestricted, although with reference to example to invention has been detailed description, those of ordinary skill in the art is to be understood that, can modify to technical scheme of the present invention or equivalent replacement, and not departing from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of right of the present invention.

Claims (9)

1. a cooperative control method for cold-strip steel edge crease defect and edge thickness, is characterized in that, comprising:
Obtain hot rolling raw material local high spot and receive standard;
Receive standard according to described local high spot, the deviate that the thinning desired value of calculating steel edge portion, edge thinning allow and edge thicken desired value relatively;
The deviate allowed according to the thinning desired value of described steel edge portion, edge thinning and edge thicken desired value relatively, judge whether described steel edge portion is in edge thinning state, edge thickening state and edge and relatively thickens state;
Obtain working roll roll shifting regulated quantity according to described steel edge portion status, realize the adjustment to described steel edge portion status;
The computing formula that described raw material local high spot receives standard is:
l=λ δ·λ L·(H-h)/H;
Wherein, l: described raw material local high spot receives standard; λ δ: described band steel yield strength factor of influence; λ l: described raw material local high spot is apart from the factor of influence of described steel edge portion length; H: described raw material target thickness; H: described band steel target thickness.
2. the cooperative control method of cold-strip steel edge crease defect according to claim 1 and edge thickness, is characterized in that:
The computing formula of the thinning desired value of described calculating steel edge portion is:
SPC T=4·λ δ·h·0.1%;
Wherein, SPC t: the thinning desired value of described steel edge portion; λ δ: described band steel yield strength factor of influence; H: described band steel target thickness.
3. the cooperative control method of cold-strip steel edge crease defect according to claim 1 and edge thickness, is characterized in that:
The computing formula of the deviate that described edge thinning allows is:
SPC D=(6-λ δ)·h·0.1%;
Wherein, SPC d: the departure of the thinning permission of described steel edge portion; λ δ: described band steel yield strength factor of influence; H: described band steel target thickness.
4. the cooperative control method of cold-strip steel edge crease defect according to claim 1 and edge thickness, is characterized in that:
The computing formula that described edge thickens desired value is relatively:
h T=(5-λ δ)·h·0.1%;
Wherein, h t: described steel edge portion thickens desired value relatively; λ δ: described band steel yield strength factor of influence; H: described band steel target thickness.
5. the cooperative control method of cold-strip steel edge crease defect according to claim 1 and edge thickness, is characterized in that:
Described λ δcomputing formula be:
λ δ=1+(δ-260)/60;
Wherein, δ: the average yield strength of described band steel steel grade.
6. the cold-strip steel edge crease defect according to any one of claim 2-4 and the cooperative control method of edge thickness, is characterized in that:
Described λ δcomputing formula be:
λ δ=2-(δ-260)/60;
Wherein, δ: the average yield strength of described band steel steel grade.
7. the cooperative control method of cold-strip steel edge crease defect according to claim 1 and edge thickness, is characterized in that:
If when described raw material local high spot is within apart from described steel edge portion 60mm, then λ l=+∞;
If described raw material local high spot apart from beyond described steel edge portion 60mm time, then λ l=10.
8. the cooperative control method of cold-strip steel edge crease defect according to claim 6 and edge thickness, is characterized in that, judges whether steel edge portion is in edge thinning state, edge thickening state and edge and relatively thickens state and specifically comprise:
Calculate the actual thinning value of described steel edge portion:
001"/>
What calculate described steel edge portion reality thickens value relatively:
002"/>
If h e> SPC t+ SPC d, then described steel edge portion is in thinning state;
If h e< SPC t-SPC d,then described steel edge portion is in the state of thickening;
If h s> h t, then described steel edge portion is in and relatively thickens state;
Wherein, h e: the actual thinning value of described steel edge portion; h c: the central spot actual (real) thickness deviate of described band steel; h s: described steel edge portion reality thickens value relatively; described steel edge portion χ 1position actual (real) thickness deviate; described steel edge portion χ 2position actual (real) thickness deviate; described steel edge portion χ 3position actual (real) thickness deviate; described steel edge portion χ 4position actual (real) thickness deviate; χ 1< χ 2< χ 3< χ 4; SPC t: the thinning desired value of described steel edge portion; SPC d: the departure of the thinning permission of described steel edge portion; h t: described steel edge portion thickens desired value relatively.
9. the cooperative control method of cold-strip steel edge crease defect according to claim 8 and edge thickness, it is characterized in that, obtain working roll roll shifting regulated quantity according to steel edge portion status, realize specifically comprising the adjustment of described steel edge portion status:
If described steel edge portion is in edge thinning state or edge thickening state, then:
According to formula sf2 n=(h e-SPC t) × λ n/ (λ 1+ λ 2) × λ n/ 10 calculate described working roll roll shifting regulated quantity, and are regulated the n-th frame in roll shifting control system by described working roll roll shifting regulated quantity;
If described steel edge portion is in edge and relatively thickens state, then:
According to formula sf1=(h s-h t) the described working roll roll shifting regulated quantity of 4 calculating, and by described working roll roll shifting regulated quantity, the 3rd frame in described roll shifting control system is regulated;
Wherein, sf2 n: the working roll roll shifting regulated quantity of the n-th frame; The working roll roll shifting regulated quantity of the sf1: the 3 frame; λ 1: the 1st frame load weight; λ 2: the 2nd frame load weight; λ n: the n-th frame load weight; N=1 or 2.
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