CN103028613B - Method for improving plate shape quality of head portion or tail portion of hot rolling strip steel - Google Patents
Method for improving plate shape quality of head portion or tail portion of hot rolling strip steel Download PDFInfo
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Abstract
The invention relates to the field of plate shape control of hot rolling strip steel, in particular to a method for improving plate shape quality of a head portion or a tail portion of hot rolling strip steel. The method for improving the plate shape quality of the head portion or the tail portion of the hot rolling strip steel is characterized in that a balance state is switched to a roll bending state in advance according to time series of switch of the head portion before the head portion bites steel, and the roll bending state is switched to the balance state according to the time series of switch of the tail portion after the tail portion discharges the steel. Roll bending force which is set according to the plate shape of the head portion and the tail portion judges limitations in a switchover process. When the roll bending force exceeds a prescribed limitation, the roll bending force needs to be recalculated. A calculation principle is that the priority is given to maintaining glancing flatness of the head portion and the tail portion of the strip steel, the head portion and the tail portion of the strip steel are enabled to present micro edge waves, and the degree of convexity of the strip steel is preferably close to a target value. Compared with the prior art, the method for improving the plate shape quality of the head portion or the tail portion of the hot rolling strip steel has the advantages that calculation and judge of the roll bending force are respectively introduced to switchover time series of the head portion of the strip steel and the switchover time series of the tail portion of the strip steel, the plate shape quality of the head portion and tail portion of the strip steel is improved, ratios of steel clamping in the head portion in a finish rolling and a reeling area and steel drifting in the tail portion in the finish rolling area caused by bad shape of a tail plate are reduced.
Description
Technical field
The present invention relates to Flatness of Hot Rolled Strip control field, particularly relate to a kind of method improving hot-strip head or afterbody strip shape quality.
Background technology
When hot-strip is produced, roller is the visual plant controlling belt plate shape, is also the only resource of dynamic conditioning plate shape.So terminate to throwing steel from band steel is nipped, if the roller of have left, then belt plate shape is just uncontrollable.During normal production, band steel is after steel time delay 100 ~ 200 milliseconds stung by finishing mill, equilibrant force is converted to bending roller force, and before steel thrown by band steel, bending roller force is converted to equilibrant force, and balance control valve is switch valve, pressure cannot on-line tuning, equilibrant force is generally 70 ~ 80 tons, and roller adopts servo valve control, can realize the flexible adjustment of bending roller force, and the governing response time is short, bending roller force control range is 10 ~ 150 tons.
Shape models drops into rolling time length from initial stage to latter stage according to roll affect roller roll thermal crown, roll wear, and the bending roller force of the factor calculating such as the actual plate shape feedback shut out sets in different size.If bending roller force setting is less than 30 tons, dropping into roller state before this frame stings steel and likely cannot support working roll, cause working roll and backing roll to have gap, very easily causing working roll and backing roll to clash into when stinging steel moment, light then occur dent, heavy then roller loses flesh or roll breakage.Therefore at present input time series stings time delay 100 ~ 200 milliseconds after steel for this frame, is switched to roller state by poised state.If bending roller force setting larger (being greater than 120 tons), do not switch to poised state before throwing steel, fluid pressure line greatly easily suppresses bad pipeline because throwing steel drift hits instantaneous pressure.Therefore, after last frame throws steel after 40 ~ 50 milliseconds (this frame throw steel before), this frame is switched to poised state by roller state.
Because the valve switching control is common double electromagnet three-position valve, response time itself is slower, add that balance roller valve platform is from balance roll-bending cylinder distance, therefore roller is balanced longer for switching time, about 500 milliseconds are approximately needed during input, be about 1 second when afterbody removes, cause head or afterbody plate shape very bad.Especially for roller in latter stage, bending roller force is obviously greater than equilibrant force, and balance roller is longer for switching time, and head drops into and is about about 800 milliseconds, and afterbody removes and is about about 2 seconds.Nearly 20 ~ 50 meters of long deformed steel strip of the finished product head rolled out, nearly about 40 ~ 100 meters deformed steel strip of afterbody, convexity and shape wave performance inconsistency lattice probability increase greatly, the rolling increased risk brought, add finish rolling district, the steel-fastening of coiling area head and finish rolling afterbody whipping probability, winding unit/afterbody scroll also can be affected simultaneously, easily occurs that scroll is bad, edge shape wave is bad in addition very easily there is crimping batching in jig, occurs substandard products.
Summary of the invention
The object of this invention is to provide a kind of method improving hot-strip head or afterbody strip shape quality, overcome the deficiencies in the prior art, respectively one section of time delay is increased respectively after stinging steel and after throwing steel, make up the delayed of hydraulic control circuit, introduce the judgement of bending roller force simultaneously, improve hot-strip head or afterbody strip shape quality, minimizing accident occurrence probability, enhances productivity.
For solving the problems of the technologies described above, technical scheme of the present invention is:
A kind of method improving hot-strip head or afterbody strip shape quality, head is switched to roller state by balance in advance according to head conversion timing sequence before stinging steel, poised state is switched to by roller again according to afterbody conversion timing sequence after afterbody throws steel, switch the bending roller force of hour hands to head or afterbody plate shape setting and carry out limit judgement, if bending roller force exceeds prescribed limit scope, then need to recalculate bending roller force, calculating principle ensures glacing flatness based on strip steel head or afterbody, strip steel head or afterbody is made to present micro-limit wave, and make strip profile close to desired value as far as possible, on this basis, the switching bending roller force of each frame is determined according to geometric ratio convexity principle, wherein:
Described head conversion timing sequence, its operating procedure is as follows:
1) before finish rolling, edger roll is stung after steel adds time delay 100 ~ 120 milliseconds, completes F1 frame and switches;
2), for F2 ~ F5 frame, after last frame stings steel time delay 100 ~ 120 milliseconds, complete this frame and switch;
3) for F6 frame, F4 frame is stung after steel adds time delay 200 ~ 320 milliseconds, completes F6 frame and switches;
Described afterbody conversion timing sequence, refers to that F1 ~ F6 frame is switched to poised state by roller after throwing steel time delay 300 ~ 320 milliseconds;
Described band steel bending roller force defining method is as follows:
1) after edger roll stings steel before finish rolling, judge the setting bending roller force of F1 ~ F6 frame, if when F1 ~ F6 bending roller force setting value is within the scope of 30 ~ 120 tons, this frame performs by setting value; If during the bending roller force < of a certain frame 30 tons or > 120, this frame, by 30 tons or 120 tons of execution, meanwhile, according to secondary setting data, recalculates the bending roller force of other frame by geometric ratio convexity principle;
2) after before finish rolling, edger roll throws steel, the actual roll-force of locking F1 ~ F6 frame, actual roll gap and actual bending roller force, if when F1 ~ F6 frame bending roller force lock value is within the scope of 30 ~ 120 tons, this frame is pressed lock value and is performed; If during the bending roller force < of a certain frame 30 tons or > 120, this frame, by 30 tons or 120 tons of execution, meanwhile, according to locking actual value, recalculates the bending roller force of other frame by geometric ratio convexity principle;
3) bending roller force method is calculated by geometric ratio convexity principle:
Convexity and the thickness of each frame is calculated respectively according to following formula 1 and formula 2, then according to formula 3 and the formula 4 of Shohet discriminate, as met-2 Δ < δ < Δs, do not carry out correction bending roller force, otherwise revise the bending roller force of corresponding frame, bending roller force is calculated as follows:
In formula: BFN: bending roller force, t; C
m: strip profile, μm; RFS: roll-force, t; C
wC: the comprehensive roll forming radius value in the middle part of the working roll body of roll, μm; C
wE: the comprehensive roll forming radius value of working roll body of roll edge, μm; C
bC: the comprehensive roll forming radius value in the middle part of the support roller body of roll, μm; C
bE: the comprehensive roll forming radius value of support roller body of roll edge, μm; k
rF: roll-force influence coefficient, μm/t; k
bF: bending roller force influence coefficient, μm/t; k
wC: roll forming influence coefficient in the middle part of working roll; k
wE: working roll edge roll forming influence coefficient; k
bC: roll forming influence coefficient in the middle part of support roller; k
bE: support roller edge roll forming influence coefficient; k
const: constant factor;
Spring equation:
In formula: S
0a year roller is had to meet, mm; H milling train exit thickness, mm; C
pmill stiffness, kN/mm; P roll-force, kN; P
0roll-force, kN; G thermal expansion and roll wear compensate, mm; 0 oil membrane thickness compensation, mm;
Can judge under certain draught pressure, bending roller force by Shohet discriminate, whether the band steel after rolling there will be visible shape wave;
-2Δ＜δ＜Δ
α=40, β=2 or 1.86
If δ > Δ, goes out middle wave; If δ <-2 Δ, goes out limit wave;
In formula: H, h: frame entrance, outlet belt steel thickness; CH, Ch: frame entrance, outlet strip profile; BW: strip width; δ: the difference of frame entrance, outlet band steel ratio convexity.
Compared with prior art, the invention has the beneficial effects as follows: the calculating introducing bending roller force in strip steel head conversion timing sequence and afterbody conversion timing sequence respectively judges, improve hot-strip head or afterbody strip shape quality, reduction excuse tailgate shape is bad causes finish rolling district, the steel-fastening of coiling area head and finish rolling afterbody whipping probability, avoid batching head or afterbody scroll is affected, avoid because edge occurs that shape wave causes batching in jig the substandard products occurring that crimping causes, improve quality simultaneously, greatly reduce time of casualty, improve production efficiency.
Detailed description of the invention
Below the specific embodiment of the present invention is described further:
A kind of method improving hot-strip head or afterbody strip shape quality, head is switched to roller state by balance in advance according to head conversion timing sequence before stinging steel, poised state is switched to by roller again according to afterbody conversion timing sequence after afterbody throws steel, switch the bending roller force of hour hands to head or afterbody plate shape setting and carry out limit judgement, if bending roller force exceeds prescribed limit scope, then need to recalculate bending roller force, calculating principle ensures glacing flatness based on strip steel head or afterbody, strip steel head or afterbody is made to present micro-limit wave, and make strip profile close to desired value as far as possible, on this basis, the switching bending roller force of each frame is determined according to geometric ratio convexity principle, wherein:
Described head conversion timing sequence, its operating procedure is as follows:
1) before finish rolling, edger roll is stung after steel adds time delay 100 ~ 120 milliseconds, completes F1 frame and switches;
2), for F2 ~ F5 frame, after last frame stings steel time delay 100 ~ 120 milliseconds, complete this frame and switch;
3) for F6 frame, F4 frame is stung after steel adds time delay 200 ~ 320 milliseconds, completes F6 frame and switches;
Described afterbody conversion timing sequence, refers to that F1 ~ F6 frame is switched to poised state by roller after throwing steel time delay 300 ~ 320 milliseconds;
Described band steel bending roller force defining method is as follows:
1) after edger roll stings steel before finish rolling, judge the setting bending roller force of F1 ~ F6 frame, if when F1 ~ F6 bending roller force setting value is within the scope of 30 ~ 120 tons, this frame performs by setting value; If during the bending roller force < of a certain frame 30 tons or > 120, this frame, by 30 tons or 120 tons of execution, meanwhile, according to secondary setting data, recalculates the bending roller force of other frame by geometric ratio convexity principle;
2) after before finish rolling, edger roll throws steel, the actual roll-force of locking F1 ~ F6 frame, actual roll gap and actual bending roller force, if when F1 ~ F6 frame bending roller force lock value is within the scope of 30 ~ 120 tons, this frame is pressed lock value and is performed; If during the bending roller force < of a certain frame 30 tons or > 120, this frame, by 30 tons or 120 tons of execution, meanwhile, according to locking actual value, recalculates the bending roller force of other frame by geometric ratio convexity principle;
3) bending roller force method is calculated by geometric ratio convexity principle:
Convexity and the thickness of each frame is calculated respectively according to following formula 1 and formula 2, then according to formula 3 and the formula 4 of Shohet discriminate, as met-2 Δ < δ < Δs, do not carry out correction bending roller force, otherwise revise the bending roller force of corresponding frame, bending roller force is calculated as follows:
In formula: BFN: bending roller force, t; C
m: strip profile, μm; RFS: roll-force, t; C
wC: the comprehensive roll forming radius value in the middle part of the working roll body of roll, μm; C
wE: the comprehensive roll forming radius value of working roll body of roll edge, μm; C
bC: the comprehensive roll forming radius value in the middle part of the support roller body of roll, μm; C
bE: the comprehensive roll forming radius value of support roller body of roll edge, μm; k
rF: roll-force influence coefficient, μm/t; k
bF: bending roller force influence coefficient, μm/t; k
wC: roll forming influence coefficient in the middle part of working roll; k
wE: working roll edge roll forming influence coefficient; k
bC: roll forming influence coefficient in the middle part of support roller; k
bE: support roller edge roll forming influence coefficient; k
const: constant factor;
Spring equation:
In formula: S
0a year roller is had to meet, mm; H milling train exit thickness, mm; C
pmill stiffness, kN/mm; P roll-force, kN; P
0roll-force, kN; G thermal expansion and roll wear compensate, mm; 0 oil membrane thickness compensation, mm;
Can judge under certain draught pressure, bending roller force by Shohet discriminate, whether the band steel after rolling there will be visible shape wave;
-2Δ＜δ＜Δ
α=40, β=2 or 1.86
If δ > Δ, goes out middle wave; If δ <-2 Δ, goes out limit wave;
Do not go out Ch threshold values and the minimum (namely as Ch > Chmin, not going out middle wave) of middle wave:
Do not go out CH threshold values and the maximum (namely as CH < CHmax, not going out middle wave) of middle wave:
Do not go out Ch threshold values and the maximum (namely as Ch < Chmax, not going out limit wave) of limit wave:
Do not go out CH threshold values and the minimum (namely as CH > CHmin, not going out limit wave) of limit wave:
In formula: H, h: frame entrance, outlet belt steel thickness; CH, Ch: frame entrance, outlet strip profile; BW: strip width; δ: the difference of frame entrance, outlet band steel ratio convexity.
Claims (1)
1. one kind is improved the method for hot-strip head or afterbody strip shape quality, it is characterized in that, head is switched to roller state by balance in advance according to head conversion timing sequence before stinging steel, poised state is switched to by roller again according to afterbody conversion timing sequence after afterbody throws steel, switch the bending roller force of hour hands to head or afterbody plate shape setting and carry out limit judgement, if bending roller force exceeds prescribed limit scope, then need to recalculate bending roller force, calculating principle ensures glacing flatness based on strip steel head or afterbody, strip steel head or afterbody is made to present micro-limit wave, and make strip profile close to desired value as far as possible, on this basis, the switching bending roller force of each frame is determined according to geometric ratio convexity principle, wherein:
Described head conversion timing sequence, its operating procedure is as follows:
1) before finish rolling, edger roll is stung after steel adds time delay 100 ~ 120 milliseconds, completes F1 frame and switches;
2), for F2 ~ F5 frame, after last frame stings steel time delay 100 ~ 120 milliseconds, complete this frame and switch;
3) for F6 frame, F4 frame is stung after steel adds time delay 200 ~ 320 milliseconds, completes F6 frame and switches;
Described afterbody conversion timing sequence, refers to that F1 ~ F6 frame is switched to poised state by roller after throwing steel time delay 300 ~ 320 milliseconds;
Described band steel bending roller force defining method is as follows:
1) after edger roll stings steel before finish rolling, judge the setting bending roller force of F1 ~ F6 frame, if when F1 ~ F6 bending roller force setting value is within the scope of 30 ~ 120 tons, this frame performs by setting value; If the bending roller force < of a certain frame 30 tons or bending roller force >120 ton hour, this frame, by 30 tons or 120 tons of execution, meanwhile, according to secondary setting data, recalculates the bending roller force of other frame by geometric ratio convexity principle;
2) after before finish rolling, edger roll throws steel, the actual roll-force of locking F1 ~ F6 frame, actual roll gap and actual bending roller force, if when F1 ~ F6 frame bending roller force lock value is within the scope of 30 ~ 120 tons, this frame is pressed lock value and is performed; If the bending roller force < of a certain frame 30 tons or bending roller force >120 ton hour, this frame, by 30 tons or 120 tons of execution, meanwhile, according to locking actual value, recalculates the bending roller force of other frame by geometric ratio convexity principle;
3) bending roller force method is calculated by geometric ratio convexity principle:
Convexity and the thickness of each frame is calculated respectively according to following formula 1 and formula 2, then according to formula 3 and the formula 4 of Shohet discriminate, as met-2 Δ < δ < Δs, do not carry out correction bending roller force, otherwise revise the bending roller force of corresponding frame, bending roller force is calculated as follows:
In formula: BFN: bending roller force, t; C
m: strip profile, μm; RFS: roll-force, t; C
wC: the comprehensive roll forming radius value in the middle part of the working roll body of roll, μm; C
wE: the comprehensive roll forming radius value of working roll body of roll edge, μm; C
bC: the comprehensive roll forming radius value in the middle part of the support roller body of roll, μm; C
bE: the comprehensive roll forming radius value of support roller body of roll edge, μm; k
rF: roll-force influence coefficient, μm/t; k
bF: bending roller force influence coefficient, μm/t; k
wC: roll forming influence coefficient in the middle part of working roll; k
wE: working roll edge roll forming influence coefficient; k
bC: roll forming influence coefficient in the middle part of support roller; k
bE: support roller edge roll forming influence coefficient; k
const: constant factor;
Spring equation:
In formula: S
0a year roller is had to meet, mm; H milling train exit thickness, mm; C
pmill stiffness, kN/mm; P roll-force, kN; P
0roll-force, kN; G thermal expansion and roll wear compensate, mm; O oil membrane thickness compensation, mm;
Can judge under certain draught pressure, bending roller force by Shohet discriminate, whether the band steel after rolling there will be visible shape wave;
-2Δ＜δ＜Δ
α=40, β=2 or 1.86
If δ > Δ, goes out middle wave; If δ <-2 Δ, goes out limit wave;
In formula: H, h: frame entrance, outlet belt steel thickness; C
h, C
h: frame entrance, outlet strip profile; BW: strip width; δ: the difference of frame entrance, outlet band steel ratio convexity.
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| CN112718873B (en) * | 2020-12-14 | 2022-07-12 | 攀钢集团攀枝花钢钒有限公司 | Method for improving straightness of front end part of steel rail |
| CN113680828A (en) * | 2021-08-23 | 2021-11-23 | 北京北科麦思科自动化工程技术有限公司 | Automatic thickness control method used in plate strip production process |
| CN113909298B (en) * | 2021-09-24 | 2023-10-10 | 江苏省沙钢钢铁研究院有限公司 | Steel plate hot rolling mill row and control method of steel throwing distance thereof |
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