CN101648215A - Method for controlling strip-steel edge drop of tandem mills - Google Patents
Method for controlling strip-steel edge drop of tandem mills Download PDFInfo
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- CN101648215A CN101648215A CN200810041688A CN200810041688A CN101648215A CN 101648215 A CN101648215 A CN 101648215A CN 200810041688 A CN200810041688 A CN 200810041688A CN 200810041688 A CN200810041688 A CN 200810041688A CN 101648215 A CN101648215 A CN 101648215A
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Abstract
The invention provides a method for controlling strip-steel edge drop of tandem mills. The method comprises that: a, an edge drop instrument is arranged in front of a tandem mill; b, when strip steelpasses through the edge drop instrument, a PLC controller determines a sampling length according to the position of the edge drop instrument in the length of a whole roll of strip steel, and the edgedrop instrument acquires data of strip-steel edge drop on two side parts of the sampling length, calculates a preset value of leap position of a leap work roll of the tandem mill within the sampling length, and stores the value, thus the PLC controller finishes determining the sampling length, calculating and storing the preset value of the leap position of the leap work roll of the tandem mill within the sampling length, and then finishes determining next sampling length, calculating and storing the preset value of the leap position within the next sampling length in sequence; and c, when each sampling length passes through the leap work roll of the tandem mill, the PLC controller controls the leap work roll to leap on the strip steel within the sampling length according to the preset value of the leap position within the sampling length. The method has the advantage of realizing high-precision control of strip-steel edge drop.
Description
Technical field
The present invention relates to the belt steel rolling technology, relate in particular to the strip edge edge control method of tandem mill.
Background technology
Edge drop (edge drop is the attenuate of the strip edge portion relative zone line of thickness position thickness or thickens) is the important cross section quality index of strip material, also is the important indicator that directly reflects a cold continuous rolling quality in kind control level.Especially for the electrical steel product of full continuous cold rolling explained hereafter, the quality of edge drop control quality in kind level, directly influence the end user in the punching process stability and punching after the quality of lamination coefficient, also determine simultaneously the designed size of production process side cut amount in the rolling production process, therefore the sour milling train group quality in kind level of effectively controlling edge drop thickness cause close important.Control (Edge Drop Control) and automatic thickness control (AGC) no less important fall in the tandem mill unit top edge at rolling electrical sheet.The important means of edge drop control is that the roll forming of working roll and the shifting amount of working roll are set.The roll forming of working roll is fixed, and the shifting amount of working roll can be regulated variation in the operation of rolling.
Control technology falls in the edge that present sour milling train group adopts, and the default definite value of No. 1 to No. 3 frame upper working rolls and lower working rolls shifting amount is from process computer, and its basis mainly is the hot-strip convex value, and every coil volume has only one group of default definite value.No. 1 to No. 3 frame working roll of milling train falls correspondingly play of actual value according to No. 5 frame outlet edges, to improve the edge drop actual achievement.This edge drop control mode is that it is manual to be fed back to major control based on default definite value.On other tandem mills, also all adopt the default definite value of one group of working roll shifting amount and the control method of edge drop feedback mostly.
There is some weak point in this control mode in actual production process:
1) the default definite value of working roll shifting amount is to calculate with the average convex value of incoming hot rolled slab to get, and coil volume has only a setting value.
2) this edge drop control is to be feedback controlled to main means, but No. 1 the nearly 20m of instrument physical distance falls in frame to 5 frame outlet edge, this just makes FEEDBACK CONTROL lag behind, and is not obvious for the regulating effect of hot-strip limit portion thickness short term variations, even it is disorderly control to occur.
3) the hot-strip convexity alters a great deal in the actual production, and the FEEDBACK CONTROL regulating measure is limited, occurs the working roll play often to the situation of the upper limit, and milling train outlet strip edge edge falls and off-gage phenomenon occurs, influences properties of product.
Therefore, it is not enough accurate to the control accuracy of strip edge edge Jiang thickness that control method falls in existing strip edge edge, and this has directly influenced the serviceability of band steel, and also influential to the lumber recovery of unit production band steel.
Summary of the invention
Control method falls in the strip edge edge that technical problem to be solved by this invention provides a kind of tandem mill, this method realizes the precision control to the edge drop thickness of band steel, thereby improved the lumber recovery of being with the serviceability of steel and having improved unit production band steel, to overcome the deficiencies in the prior art.
In order to solve the problems of the technologies described above, the present invention adopts following technical scheme:
Control method falls in a kind of strip edge edge of tandem mill, it is characterized in that adopting following step:
A, instrument falls in mounting edge before tandem mill;
B, when band steel process edge drop instrument, the PLC controller determines that according to the position of edge drop instrument in whole winding steel length a sampling length and edge drop instrument gather the strip edge edge drop data of dual-side portion in this sampling length, calculates the default definite value in the play position of play working roll in this sampling length of tandem mill and stores this value;
So, finish according to the order of sequence after the PLC controller is finished and determined a sampling length and calculate, store the default definite value in the interior play position of this sampling length and determine next sampling length and calculate, store the default definite value in the interior play position of next sampling length;
C, when each sampling length during through the play working roll of tandem mill, the PLC controller is according to play on the band steel of the default definite value control play working roll in the play position in this sampling length in this sampling length.
Described strip edge edge data are the one-tenth-value thickness 1/10 of a plurality of location points of band steel dual-side portion.
Described strip edge edge drop data calculates the default definite value in play position by following formula:
ΔH_WS(i)＝H_WS
i-H_WS
a (1)，
ΔH_DS(i)＝H_DS
i-H_DS
a (2)，
ΔS_ws(i)＝α(i)×ΔH_WS(i)+Pos(i) (3)，
ΔS_ds(i)＝α(i)×ΔH_DS(i)+Pos(i) (4)，
ΔShift_ws_Pre＝∑(ΔS_ws(i)×β(i)) (5)，
ΔShift_ds_Pre＝∑(ΔS_ds(i)×β(i)) (6)；
Above-mentioned various in, the reference numeral of each location point of i, this number value is the distance value of each location point apart from the strip edge edge, a is the numbering of the reference position point selected from each location point; H_WS
iBe the one-tenth-value thickness 1/10 of band steel active side location point, H_WS
aOne-tenth-value thickness 1/10 for band steel active side reference position point; Δ H_WS (i) is thick poor for the band steel between band steel each location point of active side and the reference position point; H_DS
iBe the one-tenth-value thickness 1/10 of band steel transmission side location point, H_DS
aBe the one-tenth-value thickness 1/10 of band steel transmission side reference position point, Δ H_DS (i) is thick poor for the band steel between band steel each location point of transmission side and the reference position point; α (i) is the parameter of corresponding play shape of working roll, Pos (i) is the numerical value of each location point, it is the i value, Δ S_ws (i) for the play working roll that calculates by each location point in band steel active side shifting amount, Δ S_ds (i) is the play working roll that calculates by each location point shifting amount at band steel transmission side; β (i) is each location point component contribution coefficient, Δ Shift_ws_Pre is that the interior play working roll of a sampling length that calculates is preset definite value in the play position of band steel active side, and Δ Shift_ds_Pre is that the play working roll is preset definite value in the play position of band steel transmission side in the sampling length that calculates.
The PLC controller determines that according to the position of edge drop instrument in whole winding steel length sampling length is: when the edge drop instrument was positioned at band steel toe portion and tail length scope, sampling length was less length; When the edge drop instrument was positioned at band steel middle part length range, sampling length was long length.
Described tandem mill is sour cold continuous rolling, has a plurality of frames, and the upper and lower working roll that is positioned at least on the frame of forefront is the play working roll.
Described play working roll is single side portion tapered roller or the working roll that reduces gradually for the one-sided end of roller rigidity.
Described edge drop instrument is installed in the position that sour cold-rolling mill the place ahead distance is no less than 10m.
Adopt technique scheme, the strip edge edge control method of tandem mill of the present invention has following advantage:
1), during belt steel rolling, the default definite value in the play position of play working roll shifting amount no longer is data of fixing, but, can change the default definite value of adjusting the working roll shifting amount with the hot-strip convex value according to one group of orderly default definite value that a plurality of sampling lengths of band steel are formed.
2), original regulating measure is feedback system fully, the output analogy of the control of feeding back after the pre-control input significantly reduces, and uses present technique pre-control export ratio 70% at present, the feedback export ratio is 30%.
3), adopt method of the present invention after, the edge drop control of tandem mill can more effectively be eliminated the hot rolling convexity and change the influence that rolling back strip edge edge is fallen, and cold-strip steel edge drop technical indicator is significantly improved.
Therefore, the strip edge edge control method of tandem mill of the present invention has realized the high accuracy control to the edge drop thickness of band steel, thereby has improved the lumber recovery of being with the serviceability of steel and having improved unit production band steel.
Description of drawings
The present invention is described in detail below in conjunction with the drawings and specific embodiments:
Fig. 1 is a kind of edge drop instrument allocation plan of sour cold continuous rolling;
Fig. 2 is the edge drop instrument allocation plan of another kind of sour cold continuous rolling;
Fig. 3 is the rack construction schematic diagram that the play working roll is arranged of sour cold continuous rolling;
Fig. 4 is band steel sectional schematic diagram;
Fig. 5 is the implementing procedure figure of method of the present invention on tandem mill;
Fig. 6 is for to fall each sampling length strip edge edge data of instrument collection band steel at the tandem mill ingress edge, and calculates the default definite value in play position and be stored in regular turn in the CPU core buffer, is used for the schematic flow sheet of follow-up play working roll shifting amount instruction;
Fig. 7 is stored in schematic diagram in the CPU core buffer for the default definite value in the play position in each sampling length in regular turn according to sampling length;
Fig. 8 is the control flow chart to No. 1 frame of method of the present invention;
The schematic diagram that Fig. 9 takes out from the CPU core buffer according to sampling length in regular turn for the default definite value in the play position in each sampling length;
Figure 10 is that (Δ h15-Δ h100) actual measurement picture falls in tandem mill milling train outlet edge when adopting the inventive method;
Figure 11 is band steel middle part edge drop precision analysis schematic diagram.
The specific embodiment
Control method falls in the strip edge edge of tandem mill of the present invention, adopts following step:
A, instrument falls in mounting edge before tandem mill;
B, when band steel process edge drop instrument, the PLC controller is determined a sampling length and is gathered the strip edge edge drop data of dual-side portion in this sampling length by the edge drop instrument according to the position of edge drop instrument in whole winding steel length, calculates the default definite value in the play position of play working roll in this sampling length and the storing value of tandem mill;
So, finish according to the order of sequence after the PLC controller is finished and determined a sampling length and calculate, store the default definite value in the interior play position of this sampling length and determine next sampling length and calculate, store the default definite value in the interior play position of next sampling length;
C, when each sampling length during through the play working roll of tandem mill, the PLC controller is according to play on the band steel of the default definite value control play working roll in the play position in this sampling length in this sampling length.
In order to be illustrated more clearly in the present invention, describe in detail below in conjunction with accompanying drawing;
As depicted in figs. 1 and 2, at first edge drop instrument 100 is installed in the position that sour cold continuous rolling 200 the place aheads distance is no less than 10m.Wherein, sour cold continuous rolling 200 shown in Figure 1 includes five frames, is respectively 204, No. 5 frames 205 of 203, No. 4 frames of 202, No. 3 frames of 201, No. 2 frames of No. 1 frame, kink 207 before six frame the place aheads are milling train is coiling machines 208 at six frame rears.Band steel 001 enters five frames by diagram direction of arrow kink 207 before the milling train, and after five frames were rolling, at last by coiling machine 208 rolling of curling, edge drop instrument 100 just was installed in the position that kink 207 the place aheads distance before the milling train is no less than 10m.200 of sour cold continuous rollings shown in Figure 2 comprise three frames, two coiling machines 208 are arranged after being respectively 203, three frames of 202, No. 3 frames of 201, No. 2 frames of No. 1 frame, and other structure is identical with the structure of sour cold continuous rolling shown in Figure 1.It is the play working roll that these two kinds of sour cold continuous rollings all require the upper and lower working roll on the frame of forefront at least, such as the upper and lower working roll on No. 1 frame 201 is the play working roll, or the upper and lower working roll on 201, No. 2 frames 202 of No. 1 frame is the play working roll, or the upper and lower working roll on 202, No. 3 frames 203 of 201, No. 2 frames of No. 1 frame is the play working roll.
As shown in Figure 3, the rack construction of play working roll is arranged for being upper support roller 211, last intermediate calender rolls 212, top working roll 213 from top to bottom successively, bottom working roll 214, following intermediate calender rolls 215 and lower support roller 216.Band steel 001 is between upper and lower working roll 213,214.Wherein upper and lower working roll 213,214 is the play working roll, and these play working rolls are single side portion tapered roller or the working roll that reduces gradually for the one-sided end of roller rigidity.
Following steps please refer to Fig. 5, and in conjunction with Fig. 6 and Fig. 7, weld seam from the band steel, at the band steel during through the edge drop instrument of peracid cold continuous rolling inlet, the PLC controller is determined a sampling length according to the position of edge drop instrument in whole winding steel length, the method of determining is, if the edge drop instrument is positioned at the head and the tail length scope of band steel, sampling length in band steel toe portion and the tail length scope with 2m as a sampling length, be that a section is separated into a plurality of sections with 2m promptly, each section is a sampling length; If the edge drop instrument is positioned at the intermediate length scope of band steel, the sampling length of intermediate length scope is that 10m is a sampling length, is that a section is divided into a plurality of sections with 10m promptly, and each section is a sampling length.Concrete, become 10 sections by a section 2m length for dividing elements in the band steel toe 20m of the portion length range, band steel afterbody 14m length range is long for dividing elements becomes 7 sections by a section 2m, and band steel intermediate length scope is that dividing elements becomes some subregions with a section 10m length.
At this moment, with reference to figure 4, the PLC controller starts measured zone band steel following function simultaneously, when the band steel whenever passes through a sampling length scope, the band steel dual- side portion 5,10,15,20,25,30,50,75 that the 1st edge drop instrument of this sampling length scope measured, the belt steel thickness value of 125mm position, and preset the control model by the play of PLC controller and be performed as follows processing:
ΔH_WS(i)＝H_WS
i-H_WS
125 (1)，
ΔH_DS(i)＝H_DS
i-H_DS
125 (2)。
In last two formulas (1), (2), band 125mm position, steel two lateral extent edge is reference position point (also can concrete condition chosen distance edge 100,150,200mm position as the reference location point).I is the reference numeral of each location point, and this number value is the distance value of each location point apart from the strip edge edge, promptly 5,10,15,20,25,30,50,75.H_WS
iBe the one-tenth-value thickness 1/10 of band steel active side location point, H_WS
125One-tenth-value thickness 1/10 for band steel active side reference position point; Δ H_WS (i) is thick poor for the band steel between band steel each location point of active side and the reference position point; H_DS
iBe the one-tenth-value thickness 1/10 of band steel transmission side location point, H_DS
125Be the one-tenth-value thickness 1/10 of band steel transmission side reference position point, Δ H_DS (i) is thick poor for the band steel between band steel each location point of transmission side and the reference position point, that is:
ΔH_WS
125-5＝H_WS
5-H_WS
125；ΔH_DS
125-5＝H_DS
5-H_DS
125
ΔH_WS
125-10＝H_WS
10-H_WS
125；ΔH_DS
125-10＝H_DS
10-H_DS
125
ΔH_WS
125-15＝H_WS
15-H_WS1
25；ΔH_DS
125-15＝H_DS
15-H_DS
125
ΔH_WS
125-20＝H_WS
20-H_WS
125；ΔH_DS
125-20＝H_DS
20-H_DS
125
ΔH_WS
125-25＝H_WS
25-H_WS
125；ΔH_DS
125-25＝H_DS
25-H_DS
125
ΔH_WS
125-30＝H_WS
30-H_WS
125；ΔH_DS
125-30＝H_DS
30-H_DS
125
ΔH_WS
125-50＝H_WS
50-H_WS1
25；ΔH_DS
125-50＝H_DS
50-H_DS
125
ΔH_WS
125-75＝H_WS
75-H_WS
125；ΔH_DS
125-75＝H_DS
75-H_DS
125
And then calculate the play working roll by following formula (3), (4) and be with steel transmission side shifting amount Δ S_ds (i) at band steel active side shifting amount Δ S_ws (i) and play working roll;
ΔS_ws(i)＝α(i)×ΔH_WS(i)+Pos(i) (3)，
ΔS_ds(i)＝α(i)×ΔH_DS(i)+Pos(i) (4)，
Wherein, α (i) is the parameter of corresponding play shape of working roll, is 1/400, and Pos (i) is the numerical value of each location point, be Pos (1)=5, Pos (2)=10, Pos (3)=15, Pos (4)=20, Pos (5)=25, Pos (6)=30, Pos (7)=50, Pos (8)=75.
At last, press two formulas (5), (6) calculate be in the sampling length play working roll in the default definite value Δ Shift_ws_Pre in the play position of band steel active side and sampling length the play working roll at the default definite value Δ Shift_ds_Pre in the play position of band steel transmission side:
ΔShift_ws_Pre＝∑(ΔS_ws(i)×β(i)) (5)，
ΔShift_ds_Pre＝∑(ΔS_ds(i)×β(i)) (6)；
Wherein, β (i) is each location point component contribution coefficient, as is respectively β (1)=0.1, β (2)=0.1, β (3)=0.3, β (4)=0.1, β (5)=0.1, β (6)=0.1, β (7)=0.1, β (8)=0.1;
After calculating the default definite value Δ Shift_ws_Pre in play position and Δ Shift_ds_Pre in each sampling length, in these two the CPU memory caches that are stored in the PLC controller.
Adopt said method exactly, determine each sampling length successively according to the order of sequence and calculate, store the default definite value in the interior play position of each sampling length, until next weld seam to this winding steel end, concrete process, as shown in Figure 7.
With reference to figure 8 and Fig. 9, also from band steel weld seam, starting the band steel follows the tracks of, when weld seam arrives No. 1 frame, promptly when each sampling length passes through the play working roll of tandem mill, PLC controller case is transferred out the default definite value in play position in this sampling length by illustrated process and is preset definite value by the play position and control play on the band steel of play working roll in this sampling length from the CPU memory cache, promptly when this winding steel weld seam begins through No. 1 frame 201 and passes through designated length, from the CPU core buffer, access default definite value in this play position and application shifting amount instruction again as No. 1 frame 201 play working rolls.So, like this, the band steel in each sampling length is carried out the strip edge edge fall control, next weld seam up to this winding steel end.
In general, storing the default definite value in play position at the edge drop instrument place of tandem mill inlet is the seam tracking system that falls the instrument place based on ingress edge, data deposit buffering area in, and be the seam tracking system that falls the instrument place based on ingress edge when calling the default definite value of shifting amount at No. 1 frame place, be that principle is taken out the play that data are applied to the play working roll according to the order of sequence and controlled with the first in first out from the CPU core buffer.
Control method falls in the strip edge edge that more than is exactly tandem mill of the present invention, adopts said method control strip edge edge to fall and has following advantage:
1), during belt steel rolling, the default definite value in the play position of play working roll shifting amount no longer is data of fixing, but, can change the default definite value of adjusting the working roll shifting amount with the hot-strip convex value according to one group of orderly default definite value that a plurality of sampling lengths of band steel are formed.
2), original regulating measure is feedback system fully, the output analogy of the control of feeding back after the pre-control input significantly reduces, and uses present technique pre-control export ratio 70% at present, the feedback export ratio is 30%.
3), adopt method of the present invention after, the edge drop control of tandem mill can more effectively be eliminated the hot rolling convexity and change the influence that rolling back strip edge edge is fallen, and cold-strip steel edge drop technical indicator is significantly improved.Figure 10 is that (Δ h15-Δ h100) actual measurement picture falls in tandem mill milling train outlet edge when adopting the inventive method, and the steel grade specification is IW9221,2.6/0.5*1201mm.
From analysis schematic diagram shown in Figure 11 as can be seen, for the control accuracy level of the important quality in kind index edge drop thickness of electrical steel product (+1～-8um) from before transforming always in the directly progressive level about to 99% of pacing up and down of fluctuation about 95%, this is for we further improve the serviceability of product, the lumber recovery that improves unit production has been established solid technical foundation.
Claims (6)
1, control method falls in a kind of strip edge edge of tandem mill, it is characterized in that adopting following step:
A, instrument falls in mounting edge before tandem mill;
B, when band steel process edge drop instrument, the PLC controller determines that according to the position of edge drop instrument in whole winding steel length a sampling length and edge drop instrument gather the strip edge edge drop data of dual-side portion in this sampling length, calculates the default definite value in the play position of play working roll in this sampling length of tandem mill and stores this value;
So, finish according to the order of sequence after the PLC controller is finished and determined a sampling length and calculate, store the default definite value in the interior play position of this sampling length and determine next sampling length and calculate, store the default definite value in the interior play position of next sampling length;
C, when each sampling length during through the play working roll of tandem mill, the PLC controller is according to play on the band steel of the default definite value control play working roll in the play position in this sampling length in this sampling length.
2, control method falls in the strip edge edge of tandem mill according to claim 1, it is characterized in that, described strip edge edge drop data is the one-tenth-value thickness 1/10 of a plurality of location points of band steel dual-side portion.
3, control method falls in the strip edge edge of tandem mill according to claim 2, it is characterized in that, described strip edge edge drop data calculates the default definite value in play position by following formula:
ΔH_WS(i)＝H_WS
i-H_WS
a (1)，
ΔH_DS(i)＝H_DS
i-H_DS
a (2)，
ΔS_ws(i)＝α(i)×ΔH_WS(i)+Pos(i)(3)，
ΔS_ds(i)＝α(i)×ΔH_DS(i)+Pos(i)(4)，
ΔShift_ws_Pre＝∑(ΔS_ws(i)×β(i))(5)，
ΔShift_ds_Pre＝∑(ΔS_ds(i)×β(i))(6)；
Above-mentioned various in, the reference numeral of each location point of i, this number value is the distance value of each location point apart from the strip edge edge, a is the numbering of the reference position point selected from each location point; H_WS
iBe the one-tenth-value thickness 1/10 of band steel active side location point, H_WS
aOne-tenth-value thickness 1/10 for band steel active side reference position point; Δ H_WS (i) is thick poor for the band steel between band steel each location point of active side and the reference position point; H_DS
iBe the one-tenth-value thickness 1/10 of band steel transmission side location point, H_DS
aBe the one-tenth-value thickness 1/10 of band steel transmission side reference position point, Δ H_DS (i) is thick poor for the band steel between band steel each location point of transmission side and the reference position point; α (i) is the parameter of corresponding play shape of working roll, Pos (i) is the numerical value of each location point, it is the i value, Δ S_ws (i) for the play working roll that calculates by each location point in band steel active side shifting amount, Δ S_ds (i) is the play working roll that calculates by each location point shifting amount at band steel transmission side; β (i) is each location point component contribution coefficient, Δ Shift_ws_Pre is that the interior play working roll of a sampling length that calculates is preset definite value in the play position of band steel active side, and Δ Shift_ds_Pre is that the play working roll is preset definite value in the play position of band steel transmission side in the sampling length that calculates.
4, control method falls in the strip edge edge of tandem mill according to claim 1, it is characterized in that, described PLC controller determines that according to the position of edge drop instrument in whole winding steel length sampling length is:
When the edge drop instrument was positioned at band steel toe portion and tail length scope, sampling length was less length; When the edge drop instrument was positioned at band steel middle part length range, sampling length was long length.
5, control method falls in the strip edge edge of tandem mill according to claim 1, it is characterized in that, described tandem mill is sour cold continuous rolling, has a plurality of frames, and the upper and lower working roll that is positioned at least on the frame of forefront is the play working roll.
6, control method falls in the strip edge edge of tandem mill according to claim 1, it is characterized in that, described play working roll is single side portion tapered roller or the working roll that reduces gradually for the one-sided end of roller rigidity.
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| CN102641898A (en) * | 2012-03-30 | 2012-08-22 | 宝山钢铁股份有限公司 | Method for automatically controlling strip steel edge drop of cold tandem mill |
| CN103056169A (en) * | 2011-10-21 | 2013-04-24 | 宝山钢铁股份有限公司 | Control method for lowering cold continuous mill edge |
| CN103302105A (en) * | 2013-06-17 | 2013-09-18 | 河北省首钢迁安钢铁有限责任公司 | Cooperative control method for controlling edge crease defect and edge thickness of cold-rolled strip steel |
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| CN104772342A (en) * | 2014-01-15 | 2015-07-15 | 宝山钢铁股份有限公司 | Cold-rolled product edge drop feedback control system and method having various period mode |
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