CN103302105A - Cooperative control method for controlling edge crease defect and edge thickness of cold-rolled strip steel - Google Patents
Cooperative control method for controlling edge crease defect and edge thickness of cold-rolled strip steel Download PDFInfo
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- CN103302105A CN103302105A CN2013102389077A CN201310238907A CN103302105A CN 103302105 A CN103302105 A CN 103302105A CN 2013102389077 A CN2013102389077 A CN 2013102389077A CN 201310238907 A CN201310238907 A CN 201310238907A CN 103302105 A CN103302105 A CN 103302105A
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- 230000007547 defect Effects 0.000 title abstract description 6
- 239000002994 raw material Substances 0.000 claims abstract description 46
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- 230000037303 wrinkles Effects 0.000 claims description 29
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Abstract
The invention discloses a cooperative control method for controlling an edge crease defect and the edge thickness of cold-rolled strip steel. The method comprises the following steps: obtaining a local high-point reception standard of hot-rolled raw material; according to the local high-point reception standard, calculating an edge drop target value, a permissible edge drop deviation value and a relative edge thickening target value of the strip steel; according to the edge drop target value, the permissible edge drop deviation value and the relative edge thickening target value of the strip steel, judging whether the edge of the strip steel is in an edge drop state, an edge thickening state and a relative edge thickening state; and according to the state of the edge of the strip steel, obtaining the working roll shifting adjustment amount so as to adjust the state of the edge of the strip steel. In the actual application process, by controlling thickening and relative thickening of the edge of the strip steel, the edge crease defect of the cold-rolled strip steel is overcome; and on the basis that absence of the edge crease defect is ensured, the drop of the edge thickness the strip steel is also taken into account, the edge drop of the strip steel is reduced, and the trimming amount and the production cost are reduced.
Description
Technical field
The invention belongs to technical field of steel rolling, particularly the cooperative control method of a kind of cold-strip steel limit section's wrinkle defective and limit section thickness.
Background technology
Steel edge portion wrinkle defective directly affects the presentation quality with steel, and is still visual after the coating, serious then can't normally use the and need to do excision and process, thus reduced lumber recovery with steel.
By to the researching and analysing of the cold rolling data of wrinkle volumes, find all to have to a certain degree edge thickening phenomenon at steel edge portion.After steel edge portion sharply thickens, the irregular section convexity of the cat ear shape of appearance, the edge causes transverse gage and internal stress cross direction profiles inequality with steel than thick middle, the part internal stress that namely steel edge portion is relatively thick is also relatively large.In continuous annealing during heating and cooling, the strip edge edge is divided than centre temperature rise temperature drop all than comparatively fast on the one hand, unbalanced expanding with heat and contract with cold occur; The internal stress that steel edge portion is larger on the other hand fully discharges (limit section Stress Release resistance is little), and both stacks make steel edge portion generation local yielding, and inhomogeneous plastic deformation occurs when surpassing yield point, namely produces limit section wrinkle defective.
Curve falls in hot rolling raw material curve and cold rolling limit by contrast wrinkle volume, discovery causes the main cause of cold-strip steel edge thickening to have two: the one, and there is the edge thickening defective in corresponding hot rolling raw material, and also there is corresponding local high spot in corresponding cold-strip steel limit section because of raw material heredity; The 2nd, in cold-rolled process, under steel edge portion law of metal flow and roller chamfering comprehensive function, produce.
Yet in cold rolled strip steel production, because the existence of roll flexural deformation amount of deflection and the impact of incoming hot rolled slab convexity, cause inevitably and roll rear steel edge portion reduced thickness, and because the steel edge portion attenuate affects the processing of electrical sheet lamination and uses, so in actual production, control steel edge portion attenuate 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 the cold-rolled products quality, thereby ignored prevention and the control that steel edge portion is thickened.And for reducing the steel edge portion attenuate, in control procedure, produced edge thickening to a certain degree.
Summary of the invention
Technical problem to be solved by this invention provides the cooperative control method of a kind of cold-strip steel limit section's wrinkle defective and limit section thickness, can realize controlling that steel edge portion thickens, attenuate and relatively thickening, and solves the problem that the wrinkle defective appears in cold-strip steel limit section.
For solving the problems of the technologies described above, the invention provides the cooperative control method of a kind of cold-strip steel limit section's wrinkle defective and limit section thickness, comprising: obtain hot rolling raw material local high spot and receive standard; Receive standard according to described local high spot, deviate and the limit section of calculating steel edge portion attenuate desired value, edge thinning permission thicken desired value relatively; The deviate and the limit section that allow according to described steel edge portion attenuate desired value, edge thinning thicken desired value relatively, judge whether described steel edge portion is in edge thinning state, edge thickening state and limit section and relatively thickens state; Obtain working roll roll shifting regulated quantity according to described steel edge portion status, realize the adjusting 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: the factor of influence of the described steel edge portion length of described raw material local high spot distance; H: described raw material target thickness; H: described band steel target thickness.
Further, the computing formula of described calculating steel edge portion attenuate desired value is:
SPC
T＝4·λ
δ·h·0.1%;
Wherein, SPC
T: described steel edge portion attenuate desired value; λ
δ: described band steel yield strength factor of influence; H: described band steel target thickness.
Further, the computing formula of the deviate of described calculating steel edge portion attenuate permission is:
SPC
D＝(6-λ
δ)·h·0.1%;
Wherein, SPC
D: the departure that described steel edge portion attenuate allows; λ
δ: described band steel yield strength factor of influence; H: described band steel target thickness.
Further, the described calculating steel edge portion computing formula that relatively thickens desired value is:
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: described average yield strength with the steel steel grade.
Further, described λ
δComputing formula be:
λ
δ＝2-(δ-260)/60;
Wherein, δ: described average yield strength with the steel steel grade.
Further, if described raw material local high spot in the described steel edge portion 60mm of distance the time, λ then
L=+∞; If described raw material local high spot is beyond the described steel edge portion 60mm of distance the time, λ then
L=10.
Further, describedly judge whether steel edge portion is in edge thinning state, edge thickening state and limit section and relatively thickens state and specifically comprise:
Calculate the actual attenuate value of described steel edge portion:
Calculate relatively value of thickening of described steel edge portion reality:
If h
e＞SPC
T+ SPC
D, then described steel edge portion is in the attenuate 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 the state that relatively thickens;
Wherein, h
e: the actual attenuate value of described steel edge portion; h
c: described central spot actual (real) thickness deviate with steel; h
s: described steel edge portion reality is the value of thickening 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 the adjusting of described steel edge portion status is specifically comprised:
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 by described working roll roll shifting regulated quantity n frame in the described roll shifting control system are regulated;
If being in limit section, described steel edge portion relatively thickens state, then:
According to formula sf1=(h
s-h
T) 4 calculate described working roll roll shifting regulated quantity, and by described working roll roll shifting regulated quantity the 3rd frame in the described roll shifting control system is regulated;
Wherein, sf2
n: the working roll roll shifting regulated quantity of n frame; Sf1: the working roll roll shifting regulated quantity of the 3rd frame; λ
1: the 1st frame load weight; λ
2: the 2nd frame load weight; λ
n: n frame load weight; N=1 or 2.
The cooperative control method of a kind of cold-strip steel provided by the invention limit section's wrinkle defective and limit section thickness at first calculates hot rolling raw material local high spot and receives standard; Then deviate and the limit section of calculating steel edge portion attenuate desired value, edge thinning permission thicken desired value relatively; Judge again whether steel edge portion is in edge thinning state, edge thickening state and limit section and relatively thickens state; Final by roll shifting control system evaluation work roller roll shifting regulated quantity, and the present state of steel edge portion regulated, so that the present invention thickens with relative and thickens by the control steel edge portion, solved the wrinkle defect problem of cold-strip steel limit section appearance in actual application; Do not occur on the basis of limit section wrinkle defective guaranteeing simultaneously, taken into account the control of steel edge portion reduced thickness, farthest reduced the steel edge portion attenuate, reduced side cut amount and production cost.
Description of drawings
A kind of cold-strip steel limit section's wrinkle defective that Fig. 1 provides for the embodiment of the invention and the cooperative control method process chart of limit section thickness.
The specific embodiment
Below in conjunction with accompanying drawing, the specific embodiment provided by the invention is described in further detail.
Referring to Fig. 1, a kind of cold-strip steel limit section's wrinkle defective that the embodiment of the invention provides and the cooperative control method of limit section 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, deviate and the limit section of calculating steel edge portion attenuate desired value, edge thinning permission thicken desired value 102 relatively;
Step S103: the deviate and the limit section that allow according to steel edge portion attenuate desired value, edge thinning thicken desired value relatively, judge whether steel edge portion is in edge thinning state, edge thickening state and limit section and relatively thickens state 103;
Step S104: obtain working roll roll shifting regulated quantity according to the steel edge portion status, realize the adjusting 104 to the steel edge portion status.
In the present embodiment, the computing formula of calculating hot rolling raw material local high spot reception standard is:
l＝λ
δ·λ
L·(H-h)/H;
Wherein, l: the raw material local high spot receives standard; λ
δ: band steel yield strength factor of influence; λ
L: the raw material local high spot is apart from the factor of influence of steel edge portion length; H: raw material target thickness; H: band steel target thickness.
And when the raw material local high spot is in distance steel edge portion 60mm, λ then
L=+∞; When the raw material local high spot is beyond the described steel edge portion 60mm of distance, λ then
L=10.
In the present embodiment, the computing formula of calculating steel edge portion attenuate desired value is:
SPC
T＝4·λ
δ·h·0.1%;
Wherein, SPC
T: steel edge portion attenuate desired value; λ
δ: band steel yield strength factor of influence; H: band steel target thickness.
In the present embodiment, the computing formula of calculating the deviate of steel edge portion attenuate permission is:
SPC
D＝(6-λ
δ)·h·0.1%;
Wherein, SPC
D: the departure that the steel edge portion attenuate allows; λ
δ: band steel yield strength factor of influence; H: band steel target thickness.
In the present embodiment, the computing formula that the calculating steel edge portion thickens desired value relatively is:
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.
Band steel yield strength factor of influence computing formula may be defined as λ among the present embodiment step S101
δ=1+ (δ-260)/60;
Wherein, λ
δ: yield strength factor of influence, radix are 1, and corresponding average yield strength is 260; δ: band steel steel grade average yield strength.
Band steel yield strength factor of influence computing formula may be defined as λ among the present embodiment step S102
δ=2-(δ-260)/60;
Wherein, λ
δ: yield strength factor of influence, radix are 2, and corresponding average yield strength is 260; δ: band steel steel grade average yield strength.
The present embodiment receives standard for calculating hot rolling raw material local high spot among the step S101, can be 1.-2. described referring to following example:
1., the average yield strength of a certain steel grade is 290, the raw material target thickness is 2.5mm, the finished product target thickness is 0.5mm, the raw material local high spot is 100mm apart from the length of steel edge portion, then:
Yield strength factor of influence λ
δ=1+ (δ-260)/60
=1+（290-260）/60
=1.5
Wherein, local high spot is apart from the factor of influence λ of the length of steel edge portion
L=10; Then,
The 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, the raw material target thickness is 2.5mm, the finished product target thickness is 0.5mm, the raw material local high spot is 30mm apart from the length of steel edge portion, then:
Yield strength factor of influence λ
δ=1+ (δ-260)/60
=1+（290-260）/60
=1.5
Wherein, local high spot is apart from the factor of influence λ of the length of steel edge portion
L=+∞
The 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 the raw material local high spot was in distance steel edge portion 60mm, the local high spot of any height can be accepted; When the raw material local high spot is beyond distance steel edge portion 60mm, the yield strength relation in direct ratio of the reception standard of local high spot and steel grade.
Retrain the hot rolling raw material by calculating hot rolling raw material local high spot reception standard among the step S101 in the present embodiment, when hot rolling raw material local high spot exceeds the standard that calculates according to this algorithm, just need to seal at hot-rolled process, do not allow to transport to cold rolling process production, so just can not produce limit section wrinkle yet, thereby check on from hot rolling source opposite side section wrinkle.
The present embodiment thickens desired value relatively for deviate and the limit section of calculating steel edge portion attenuate desired value, edge thinning permission among the step S102, can be 3. described referring to following example:
3., the average yield strength of a certain steel grade is 260, the raw material target thickness is 2.5mm, the 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 limit section thickens desired value h relatively
T=(5-λ
δ) h0.1%
=（5-2）×0.5×0.1%=1.5um
Step S102 can be by the system that presets of balancing band steel edge thickening and attenuate in the present embodiment, according to 3. Computational Methods of example, at first according to the raw material yield strength, band steel target thickness calculates the edge thinning desired value, the departure and the relative desired value that thickens that allow, allow simultaneously the milling train operation according to the reception standard of the raw material local high spot of different steel grades, profiled outline quality and finished strip are to the demand of edge thinning, desirable with the desired value of steel both sides edge thinning and the departure of permission by operation screen input in the system, also allow simultaneously the desired value of input tape steel both sides edge thickening, and preset first three frame and (five frames are set in the production line, the band steel passes through successively from the 1st to the 5th successively, first three frame is: the 1st frame, the 2nd frame, the 3rd frame) roll shifting pre-sets, thus the attenuate of the good steel edge portion thickness of balance and the relation that thickens.
Among the present embodiment step S103, judge whether steel edge portion is in edge thinning state, edge thickening state and limit section and relatively thickens state and specifically comprise:
Calculate the actual attenuate value of steel edge portion:
Calculate relatively value of thickening of steel edge portion reality:
If h
e＞SPC
T+ SPC
D, then steel edge portion is in the attenuate 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 the state that relatively thickens;
Wherein, h
e: the actual attenuate value of steel edge portion; h
c: with the central spot actual (real) thickness deviate of steel; h
s: steel edge portion reality is the value of thickening 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 technical scheme provided by the present invention is described in detail in detail, the following stated band steel both sides comprise band steel active side and band steel driving side, regulate in the control procedure in the calculating of roll shifting regulated quantity and roll shifting, top working roll roll shifting control band steel work side portion thickness, bottom working roll roll shifting control band steel drives side portion thickness.
Preferably, χ
1=15, χ
2=20, χ
3=30, χ
4=40, namely the present embodiment step S103 can according to steel central spot thickness deviation with identify limit section with the mean value of the steel dual-side 15mm of section and 20mm place thickness deviation and whether have the attenuate situation; And whether there is the relative situation that thickens according to identifying limit section with the mean value of the steel dual-side 30mm of section and 40mm mm place thickness deviation and mean value with the steel dual-side 15mm of section and 20mm place thickness deviation.
The present embodiment can be 4. described referring to following example for judging among the step S103 whether steel edge portion is in edge thinning state, edge thickening state and limit section and relatively thickens state:
4., a certain coiled strip steel, the average yield strength of its raw material is 260, the raw material target thickness is 2.5mm, the finished product target thickness is 0.5mm.The side portion of in the operation of rolling, working 15,20,30 and the thickness deviation value at 40mm place be respectively 7um, 6um, 4um and 3um, be 0um with the thickness deviation of steel central spot, 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 limit section thickens desired value h relatively
T=(5-λ
δ) h0.1%
=（5-2）×0.5×0.1%=1.5um
The actual attenuate value of its steel edge portion h
e=(h
15+ h
20)/2-h
c
=(7+6)/2-0=6.5um
The relatively value of thickening h of steel edge portion reality
s=(h
30+ h
40)/2-(h
15+ h
20)/2
=(4+3)/2-(7+6)/2=-3um
By the above SPC that can be calculated
T+ SPC
D=4um+2um=6um
Be in the Rule of judgment h of attenuate state by steel edge portion
e＞SPC
T+ SPC
DAs can be known, band steel work side portion is in the attenuate state; Be in the Rule of judgment h that relatively thickens state by steel edge portion
s＞h
TAs can be known, band steel work side portion is not in the state that relatively thickens.
Among the present embodiment step S104, by roll shifting control system evaluation work roller roll shifting regulated quantity, and the present state of 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 n frame in the described roll shifting control system is regulated;
If being in limit section, steel edge portion 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 the roll shifting control system is regulated;
Wherein, sf2
n: the working roll roll shifting regulated quantity of n frame; Sf1: the working roll roll shifting regulated quantity of the 3rd frame; λ
1: the 1st frame load weight; λ
2: the 2nd frame load weight; λ
n: n frame load weight; N=1 or 2.
Among the present embodiment step S104, the roll shifting control system is with C-D
AveThe Edge Drop Control pattern is the roll shifting control system of core, thicken the actual conditions with steel dual-side section thickness that the evaluation module with attenuate identifies according to the identification steel edge portion, by the working roll roll shifting of regulating corresponding frame make steel edge portion thickness be in predefined attenuate and the control range that thickens in.
The present embodiment is realized the adjusting to the steel edge portion status for obtaining working roll roll shifting regulated quantity according to the steel edge portion status among the step S104, can be 5. described referring to following example:
5., a certain coiled strip steel, the average yield strength of its raw material is 260, the raw material target thickness is 2.5mm, the finished product target thickness is 0.5mm.The side portion of in the operation of rolling, working 15,20,30 and the thickness deviation value at 40mm place be respectively 4um, 3um, 7um and 6um, drive side portion 15,20,30 and the thickness deviation value at 40mm place to be respectively 7um, 6um, 4um and 3um be 0um with the thickness deviation of steel central spot, 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 limit section thickens desired value h relatively
T=(5-λ
δ) h0.1%
=（5-2）×0.5×0.1%=1.5um；
The actual attenuate value of its work side portion h
We=(h
W15+ h
W20)/2-h
c
=(3+4)/2–0=3.5um；
It drives the actual attenuate value of side portion h
De=(h
D15+ h
D20)/2-h
c
=(7+6)/2–0=6.5um；
Relatively value of thickening of its work side portion reality:
h
ws＝(h
w30+h
w40)/2-(h
w15+h
w20)/2
=(7+6)/2–(4+3)/2=3um；
It drives relatively value of thickening of side portion reality:
h
ds＝(h
d30+h
d40)/2-(h
d15+h
d20)/2
=(4+3)/2–(6+7)/2=-3um；
By the above SPC that can be calculated
T+ SPC
D=4um+2um=6um
SPC
T-SPC
D=4um–2um=2um；
Rule of judgment h by the steel edge portion state
e＞SPC
T+ SPC
DWith h
e＜SPC
T-SPC
DAs can be known, the band steel drives side portion and is in the attenuate state, and band steel active side is 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
1+λ
2)×λ
1/10
=(6.5–4)×60/(60+50)×60/10≈8(mm)
sf2
2low＝(h
de-SPC
T)×λ
2/(λ
1+λ
2)×λ
2/10
=(6.5–4)×50/(60+50)×50/10≈6(mm)
Be in the Rule of judgment h that relatively thickens state by steel edge portion
s＞h
TAs can be known, band steel work side portion is in the state that relatively thickens, and band steel driving side portion is not in the state that relatively thickens.
The 3rd frame top working roll roll shifting regulated quantity then:
sf1
up＝(h
ws-h
T)·4
=（3–1.5）×4=6（mm）
Then the roll shifting regulated quantity that roll shifting control system foundation calculates is carried out the roll shifting adjusting first time to the top working roll of the 3rd frame.After the roll shifting first time is regulated, relatively thicken state if still be in the thickness of steel work side portion, then carry out the second order 3 frame top working roll roll shifting regulated quantitys and calculate, the roll shifting regulated quantity that then roll shifting control system foundation calculates is carried out the roll shifting adjusting second time to the top working roll of the 3rd frame.After second time roll shifting is regulated, if still being in, the thickness of steel edge portion the same side relatively thickens state, then repeat by that analogy aforesaid operations, until this side steel edge portion thickness is not in and relatively thickens state or reach till the roll shifting limit.
Simultaneously, roll shifting control system is carried out the roll shifting first time according to the bottom working roll roll shifting regulated quantity of the first two frame (the 1st frame, the 2nd frame) that calculates to the first two frame and is regulated.After the roll shifting first time is regulated, still be in the attenuate state if drive the thickness of side portion with steel, then carry out for the second time bottom working roll roll shifting regulated quantity calculating of the first two frame, then roll shifting control system is carried out the roll shifting second time according to the roll shifting regulated quantity that calculates to the first two frame and is regulated.After the roll shifting second time is regulated, if still be in the attenuate state with the thickness of steel driving side portion, then repeat by that analogy aforesaid operations, until this side steel edge portion thickness is not in the attenuate state or reaches till the roll shifting limit.
The cooperative control method of a kind of cold-strip steel provided by the invention limit section's wrinkle defective and limit section thickness at first calculates hot rolling raw material local high spot and receives standard; Then deviate and the limit section of calculating steel edge portion attenuate desired value, edge thinning permission thicken desired value relatively; Judge again whether steel edge portion is in edge thinning state, edge thickening state and limit section and relatively thickens state; Final by roll shifting control system evaluation work roller roll shifting regulated quantity, and the present state of steel edge portion regulated, so that the present invention thickens with relative and thickens by the control steel edge portion, solved the wrinkle defect problem of cold-strip steel limit section appearance in actual application; Do not occur on the basis of limit section wrinkle defective guaranteeing simultaneously, taken into account the control of steel edge portion reduced thickness, farthest reduced the steel edge portion attenuate, reduced side cut amount and production cost.
It should be noted last that, the above specific embodiment is only unrestricted in order to technical scheme of the present invention to be described, although with reference to example the present invention is had been described in detail, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not breaking away from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (10)
1. the cooperative control method of a cold-strip steel limit section wrinkle defective and limit section 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, deviate and the limit section of calculating steel edge portion attenuate desired value, edge thinning permission thicken desired value relatively;
The deviate and the limit section that allow according to described steel edge portion attenuate desired value, edge thinning thicken desired value relatively, judge whether described steel edge portion is in edge thinning state, edge thickening state and limit section and relatively thickens state;
Obtain working roll roll shifting regulated quantity according to described steel edge portion status, realize the adjusting to described steel edge portion status.
2. the cooperative control method of cold-strip steel limit section's wrinkle defective according to claim 1 and limit section thickness is characterized in that:
The computing formula that described calculating hot rolling 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: the factor of influence of the described steel edge portion length of described raw material local high spot distance; H: described raw material target thickness; H: described band steel target thickness.
3. the cooperative control method of cold-strip steel limit section's wrinkle defective according to claim 1 and limit section thickness is characterized in that:
The computing formula of described calculating steel edge portion attenuate desired value is:
SPC
T＝4·λ
δ·h·0.1%;
Wherein, SPC
T: described steel edge portion attenuate desired value; 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 limit section's wrinkle defective according to claim 1 and limit section thickness is characterized in that:
The computing formula of the deviate that described calculating steel edge portion attenuate allows is:
SPC
D＝(6-λ
δ)·h·0.1%;
Wherein, SPC
D: the departure that described steel edge portion attenuate allows; 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 limit section's wrinkle defective according to claim 1 and limit section thickness is characterized in that:
The computing formula that described calculating steel edge portion thickens desired value relatively is:
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.
6. the cooperative control method of cold-strip steel limit section's wrinkle defective according to claim 2 and limit section thickness is characterized in that:
Described λ
δComputing formula be:
λ
δ＝1+(δ-260)/60;
Wherein, δ: described average yield strength with the steel steel grade.
7. the cooperative control method of each described cold-strip steel limit section's wrinkle defective and limit section thickness according to claim 3-5 is characterized in that:
Described λ
δComputing formula be:
λ
δ＝2-(δ-260)/60;
Wherein, δ: described average yield strength with the steel steel grade.
8. the cooperative control method of cold-strip steel limit section's wrinkle defective according to claim 2 and limit section thickness is characterized in that:
If described raw material local high spot is in the described steel edge portion 60mm of distance the time, λ then
L=+∞;
If described raw material local high spot is beyond the described steel edge portion 60mm of distance the time, λ then
L=10.
9. the cooperative control method of cold-strip steel limit section's wrinkle defective according to claim 7 and limit section thickness is characterized in that, describedly judges whether steel edge portion is in edge thinning state, edge thickening state and limit section and relatively thickens state and specifically comprise:
Calculate the actual attenuate value of described steel edge portion:
Calculate relatively value of thickening of described steel edge portion reality:
If h
e＞SPC
T+ SPC
D, then described steel edge portion is in the attenuate 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 the state that relatively thickens;
Wherein, h
e: the actual attenuate value of described steel edge portion; h
c: described central spot actual (real) thickness deviate with steel; h
s: described steel edge portion reality is the value of thickening 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
10. the cooperative control method of cold-strip steel limit section's wrinkle defective according to claim 9 and limit section thickness, it is characterized in that, described according to steel edge portion status acquisition working roll roll shifting regulated quantity, realize the adjusting of described steel edge portion status is specifically comprised:
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 by described working roll roll shifting regulated quantity n frame in the described roll shifting control system are regulated;
If being in limit section, described steel edge portion relatively thickens state, then:
According to formula sf1=(h
s-h
T) 4 calculate described working roll roll shifting regulated quantity, and by described working roll roll shifting regulated quantity the 3rd frame in the described roll shifting control system is regulated;
Wherein, sf2
n: the working roll roll shifting regulated quantity of n frame; Sf1: the working roll roll shifting regulated quantity of the 3rd frame; λ
1: the 1st frame load weight; λ
2: the 2nd frame load weight; λ
n: n frame load weight; N=1 or 2.
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| CN112570464A (en) * | 2019-09-29 | 2021-03-30 | 宝山钢铁股份有限公司 | Improved same-plate difference control method for edge section shape |
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| CN114505353A (en) * | 2022-01-29 | 2022-05-17 | 宝钢湛江钢铁有限公司 | Same-plate difference roll shifting feedforward static control method |
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