CN108067506A - Medium and Heavy Plate Rolling passage dynamic becomes setting control method - Google Patents

Medium and Heavy Plate Rolling passage dynamic becomes setting control method Download PDF

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Publication number
CN108067506A
CN108067506A CN201611008823.4A CN201611008823A CN108067506A CN 108067506 A CN108067506 A CN 108067506A CN 201611008823 A CN201611008823 A CN 201611008823A CN 108067506 A CN108067506 A CN 108067506A
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passage
temperature
rolling
setting
steel plate
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CN108067506B (en
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王�琦
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ROLLWARE CO Ltd SHANGHAI
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ROLLWARE CO Ltd SHANGHAI
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B37/00Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/58Roll-force control; Roll-gap control
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B37/00Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/74Temperature control, e.g. by cooling or heating the rolls or the product

Abstract

The entitled Medium and Heavy Plate Rolling passage dynamic of the present invention becomes setting control method, and fields rolls control technology field for ferrous metal and non-ferrous metal.For cut deal when passage is specified in rolling, the present invention, according to distribution of the actual measurement draught pressure along steel plate length, according to Temperature affection factor method, calculates the distribution that temperature prolongs steel plate length direction using Temperature Prediction computational methods.After the completion of passes, according to temperature fall model, when calculating next passes, distribution of the temperature along steel plate length direction, draught pressure, roll gap, the bending roller force for the dynamic change setting control for prolonging steel plate length direction are recalculated using the method for Temperature affection factor, the rolling of the lower a time of control, reaches reduction setting error, improves the purpose of setting accuracy.

Description

Medium and Heavy Plate Rolling passage dynamic becomes setting control method
Technical field
The invention belongs to metal hot-working strip product rolling technical fields, are related to a kind of new process control passage and set Determine computational methods, especially become setting control in line computation dynamic, improve the stability of production process and the dimensional accuracy of product.
Background technology
During Medium and Heavy Plate Rolling, by thick slab rolling into the smaller finished product plate of thickness, due to milling equipment ability Limitation, it is impossible to disposable roll forming, it is necessary to repeatedly reciprocal rolling could obtain final finished product thickness, often roll and once claim For a passage, each passage is borne by the reduction in thickness of a part.It is uneven due to temperature in the operation of rolling, it is past Toward larger thickness deviation is generated, the quality of product is influenced.During Strip hot rolling, Temperature Distribution is usually head and tail temperature Relatively low, middle portion temperature is higher, for longer steel plate(More than 30m), the phenomenon is particularly evident, to different steel grade and specification, Due to heating etc., the temperature at middle part is compared with head and tail temperature, to be higher by 30 ~ 110 DEG C.This gives the thickness and precision of hot rolled strip Control brings very big influence, often makes that head, tail thickness are partially thick, and interior thickness is partially thin.
Current hot rolled plate band all employs computer control system and the entire operation of rolling is controlled, to rolling Cheng Jinhang high-precision settings obtain high-precision product quality.The Main physical amount of each passage setting includes roll-force, roller Seam, bending roller force, roll torque, rolling mill speed, cooling water inflow etc., wherein mostly important is exactly setting for roll-force and roller gap It is fixed.Under normal circumstances, computer control system before steel rolling, is first given according to the specification of the plate kind of production, specification and blank Go out that rolling pass is total and the pre-set value of the Main physical amount of each passage.The numerical value of presetting physical quantity is in production process In, dynamic corrections are carried out to the numerical value of presetting each physical quantity according to the actual conditions of rolling, to obtain preferable control effect.
During hot rolled plate band Rolling Production, since variations, the temperature such as the kind, specification, heating cycle of production are long along steel plate It is big to spend direction fluctuation, and temperature often can not be measured accurately.Each passage setting of majority milling train at present is still using single-point setting Method(I.e. in each passes, only with multiple changeless setting values, such as changeless setting draught pressure is set Fixed roll seam, bending roller force etc., i.e., the setting value with a time remains unchanged)Even if having passage setting using head, in, three sections of tail sets Fixed producing line, precision is difficult to meet the needs of production due to temperature error etc., and many production lines can only use head at present The method of portion's single-point setting carrys out the steel plate of control length, this brings harmful effect to final product thickness precision, particularly For the rolling passage of long steel plate and cut deal steekle mill.
Become setting in conventional passage, due to the temperature along steel plate length direction for being difficult to accurately describe under truth Distribution is set it is difficult to obtain high-precision become, and therefore, 3 points of settings of domestic many rolling line designs, which there is no, to come into operation.
The content of the invention
The technical problems to be solved by the invention are:A kind of new method is proposed, dynamic is established and becomes setup algorithm mould Using the rolling information of front passage, the Temperature Distribution along steel plate length direction is precisely calculated in type, solve head, in, tail Temperature deviation problem, the passage dynamic for realizing whole steel sheet length direction become setting control.This method is especially in rolling pass steel Effect is more prominent in the case that plate is longer.
Medium and Heavy Plate Rolling generally uses the reciprocal roll forming of multi-pass.In production process, front passes can be utilized When information, passage below is modified.The Temperature Distribution of steel plate is generally low in head, tail, intermediate high trend.For rolling The passage crossed can roll information accordingly according to length end to end and the length records at middle part, and these information are carried out Processing, by treated, these Information applications are modified to back pass, it is possible to be reached and be improved back pass setting accuracy Purpose.
In certain passage such as i passages(Non- final pass)During rolling, steel plate is divided along its length, is grown every fixed Degree section takes a point, and calculates rolling of the acquired draught pressure average value in the range of this fixed length segment as corresponding points Pressure value, while record gap values between rollers of the roll gap average value as corresponding points in this fixed length segment.With steel plate rolling It carries out, it is assumed that n corresponding draught pressure numerical value and n corresponding gap values between rollers can be obtained.Each corresponding draught pressure Numerical value is calculated as , , , , , the gap values between rollers of each roll gap point are recorded as , , , , , it is assumed that i passages The draught pressure set as, set roll gap as, each fixed length segment is denoted as(k=1,2…n).Pass through formula(1)It can To obtain the draught pressure variation that i passages respectively record a roll gap adjustment and generate.
(1)
(1)In formula, M is mill modulus, and Q is the plastic coefficient of steel plate.Draw thus, it is possible to calculate real external disturbance The draught pressure deviation risen, such as formula(2):
(2)
(2)In formula, which is to calculate the basis of Temperature Distribution.
According to rolling therory, draught pressure is strip width, the inlet thickness of plate, the exit thickness of plate, plate Temperature, rolling mill speed, the function of roller radius, can write:
(3)
(3)In, P is roll-force, and B is strip width, and H is plate inlet thickness, and h is plate exit thickness, and T is plate temperature, V For rolling mill speed, R is roller radius.
(3)Total differential is taken, can be obtained:
(4)
By(4)It can obtain(5):
(5)
Basis as a result,(5)Formula can calculate the corresponding temperature deviation of each point of i passages, thus, it is possible to calculate each point Corresponding temperature value (), it is bent along the Temperature Distribution in steel plate length direction so as to be depicted with each point connecting line Line.
For i+1 passages, the temperature spot of the n point obtained by i passages passes through temperature fall model(Temperature fall model may be referred to respectively Class rolls textbook)It calculates, obtains new temperature calculations, for the draught pressure setup algorithm of i+1 passages, thus calculate The roll gap setting of corresponding each point.The outlet of i-th passage is the entrance of i+1 passage.
In the case where other conditions are constant, can also use(4)Reduced form calculate each corresponding points setting rolling pressure Power deviation, i.e.,:,For by the temperature deviation after passage temperature drop.It calculatesValue is as preliminary set time valueTo rolling forceAdded value, i.e.,As each point Setting value.
Hereafter, according to the adaptive approach of roll-force, the auto-adaptive parameter that dynamic becomes setting each point can be calculated, is used for The control of follow-up steel plate rolling.
The present invention implementation steps be:
1st, the rolling procedure of steel plate is calculated, obtains the presetting of each passage(One-Point-Value, Pei, Sei etc.)And each passage is corresponding partially Differential coefficient;
2nd, the passage i of start recording is selected, the steel plate length of the passage is generally required to be no less than 10m, in the passage(Containing this road It is secondary)Passage before all uses single-point setting method;
3rd, fixed length segment L is selected;
4th, the actual rolling average pressure P being recorded in k-th of length section Lik, actual average roll gap Sik
5th, setting roll gap and actual roll gap deviation S are calculatedei-Sik
6th, according to(1)Draught pressure caused by formula calculates roll gap adjustment changes
7th, according to(2)Draught pressure caused by formula calculates external disturbance changes
8th, basis(5)Formula calculates the temperature change of each length section L
9th, the temperature point value of i passages is calculated;
10th, the inlet temperature deviation of each fixed length segment of i+1 passages is calculated by temperature fall model
11st, formula is utilized(4)Reduced form calculate the draught pressure deviation of the corresponding point of i+1 passage points
12nd, the sum of the draught pressure of initial setting and each length section draught pressure deviation for newly calculating, i.e.,, It is set for controlling as each section of reality.
13rd, when new settings value issues, the rolling direction of selection passage i is considered, if i is positive(Odd-numbered pass), then The numerical value newly calculated is also required to according to i+1 passages direction(Reversed passage)Carry out tandem exchange processing.According to different sections It is long to send different setting values, thus set as multiple spot dynamic.
14th, the step of repeating 2 ~ 13 is terminated until rolling, and can obtain higher setting accuracy.Hereafter the setting of each passage Value is all the setting of each corresponding section, becomes multiple spot dynamic and sets.
Illustrate the composition schematic diagram that Fig. 1 is patent of the present invention.
Case study on implementation
Certain Heavy Plate Plant Rolling Production A class deck of boat, steel plate target length are 12mm, target width 2470mm, and target length is 50m;Supplied materials length is 4.05m, and width 2470mm, supplied materials thickness is 150mm.
The initial rolling procedure table calculated(Component values, other rollers etc. are not in it)Such as table 1.
1 initial calculation rolling procedure table of table
Passage number Pe(10KN) Se(m) Te (℃) Temperature differential item (10KN/ DEG C) Width differential term (10KN/mm) Me(10KN/mm) Qe(10KN/mm) Steel plate length (m)
1 2111 0.122818 1099 -4.53 0.976 496.901 78.89 4.950
2 2128 0.097052 1098 -4.625 1.063 504.552 85.38 6.286
3 2528 0.071102 1086 -4.783 1.121 523.494 81.56 8.469
4 2504 0.051519 1104 -4.917 1.092 512.553 85.04 11.677
5 2775 0.035117 1091 -5.062 1.164 525.282 90.06 16.803
6 2663 0.025281 1100 -5.311 1.078 513.967 97.8 22.918
7 2620 0.018265 984 -5.666 1.02 533.282 110.68 29.090
8 2408 0.015066 976 -5.686 0.975 521.273 137.71 35.394
9 2450 0.012325 900 -6.69 0.992 521.812 185.41 41.412
10 2231 0.010884 928 -7.581 0.903 510.066 219.24 47.196
11 1811 0.01053 766 -8.576 0.733 478.979 220.37 50.624
To investigate the effect of this method, according to the data in table 1, come into operation this method when choosing 10 passes, the 10th passage (Containing the 10th passage)Passage before is still set using single-point.10th passage is even-numbered pass, and segment length takes 1m, according to basis certainly The sample frequency 25ms of dynamicization L1, mill speed are calculated according to 4m/s, every section of point that can collect 10 or so(Cut deal rolls Speed processed is essentially constant speed), 48 points are collected altogether in this passage length range.The corresponding average roll pressure of each point and average Roll gap(Average pressure and average roll gap are calculated by basic automatization and are sent to Process Control System)With reference to following table:
The tables of data of sampled point is as shown in table 2.
2 sampling data table of table
Sampling number Average pressure value(10KN) Average roll gap(m)
1 2379.47 0.01066569
2 2385.24 0.010657206
3 2439.19 0.010577878
4 2501.84 0.010485757
5 2476.39 0.010523179
6 2413.11 0.010616226
7 2439.27 0.01057776
8 2376.15 0.010670572
9 2377.25 0.010668954
10 2388.76 0.01065203
11 2314.54 0.010761163
12 2248.24 0.01085865
13 2207.63 0.010918363
14 2239.92 0.010870884
15 2247.8 0.010859297
16 2206.21 0.010920451
17 2185.34 0.010951138
18 2016.29 0.011199709
19 2133.77 0.011026967
20 2073.48 0.011115617
21 2112.89 0.011057669
22 2256.01 0.010847225
23 2107.85 0.01106508
24 2017.38 0.011198106
25 1981.02 0.01125157
26 2019.45 0.011195063
27 2045.37 0.01115695
28 2006.23 0.011214501
29 1945.02 0.011304504
30 1879.35 0.011401065
31 1885.69 0.011391743
32 1945.32 0.011304063
33 1895.23 0.011377716
34 1876.59 0.011405124
35 1925.37 0.011333398
36 1988.64 0.011240366
37 1992.68 0.011234425
38 2078.31 0.011108515
39 2079.25 0.011107133
40 2133.33 0.011027614
41 2253.13 0.01085146
42 2275.31 0.010818847
43 2214.29 0.01090857
44 2345.62 0.010715463
45 2365.3 0.010686526
46 2298.39 0.01078491
47 2301.7 0.010780043
48 2415.88 0.010612153
Respective point can be calculated together by the data in table 2 and the tables of data of setting and formula (1) ~ (5) and temperature fall model External disturbance, temperature deviation, the temperature of the 11st passage each point, setting value such as table 3.
The calculated value of each section of table 3 the 10th, 11 passages corresponding points
Points Roll-force is disturbed outside 10 passages Difference(10KN) 10 passage temperature are inclined Difference(℃) 11 passage each point temperature deviations Value(℃) The segmentation of 11 passes power is inclined Difference(10KN) 11 passage each point setup algorithm values are rolled Power processed(10KN) The final setting value of 11 passages is rolled Power processed(10KN) The final fixed value of roller slit of 11 passages (m)
1 118.776 -15.6675903 -12.534 107.4922017 1918.492202 1944.853022 0.01078151
2 123.392 -16.2764806 -13.021 111.6696786 1922.669679 1862.186763 0.01062618
3 166.552 -21.9696609 -17.576 150.7294502 1961.72945 1859.790324 0.010621677
4 216.672 -28.580926 -22.864 196.0880171 2007.088017 1908.233129 0.010712701
5 196.312 -25.8952644 -20.716 177.6622305 1988.662231 1893.98482 0.010685928
6 145.688 -19.2175174 -15.374 131.8475439 1942.847544 1798.901969 0.010507268
7 166.616 -21.9781031 -17.582 150.7873701 1961.78737 1843.080417 0.010590279
8 116.12 -15.3172404 -12.253 105.0885234 1916.088523 1827.022108 0.010560106
9 117 -15.4333204 -12.346 105.8849228 1916.884923 1740.286972 0.01039713
10 126.208 -16.6479356 -13.318 114.2181568 1925.218157 1701.13308 0.01032356
11 66.832 -8.81572351 -7.0525 60.48291592 1871.482916 1700.452521 0.010322282
12 13.792 -1.81928505 -1.455 12.4817509 1823.481751 1638.456446 0.010205791
13 -18.696 2.466165414 1.973 -16.9198676 1794.080132 1635.531488 0.010200295
14 7.136 -0.94130062 -0.753 6.458075293 1817.458075 1589.724041 0.010114223
15 13.44 -1.77285318 -1.418 12.16319114 1823.163191 1586.481429 0.01010813
16 -19.832 2.61601371 2.093 -17.9479469 1793.052053 1598.28986 0.010130318
17 -36.528 4.818361694 3.855 -33.0578159 1777.942184 1630.021852 0.010189942
18 -171.768 22.65769687 18.126 -155.449926 1655.550073 1592.246274 0.010118962
19 -77.784 10.26038781 8.208 -70.3944687 1740.605531 1588.229887 0.010111415
20 -126.016 16.62260915 13.298 -114.044396 1696.955603 1629.831802 0.010189585
21 -94.488 12.46379106 9.971 -85.5115776 1725.488422 1668.608309 0.010262446
22 20.008 -2.63922965 -2.111 18.1072268 1829.107227 1693.403481 0.010309036
23 -98.52 12.99564701 10.396 -89.1605350 1721.839465 1657.837912 0.010242209
24 -170.896 22.54267247 18.034 -154.660767 1656.339233 1630.014612 0.010189929
25 -199.984 26.37963329 21.103 -180.985388 1630.014612 1656.339233 0.010239393
26 -169.24 22.32423163 17.859 -153.162088 1657.837912 1721.839465 0.010362468
27 -148.504 19.58897243 13.712 -117.596519 1693.403481 1829.107227 0.010564023
28 -179.816 23.71929825 16.603 -142.391691 1668.608309 1725.488422 0.010369324
29 -228.784 30.17860441 21.125 -181.168198 1629.831802 1696.955603 0.010315711
30 -281.32 37.10856088 25.9751 -222.770112 1588.229887 1740.605531 0.010397729
31 -276.248 36.43951985 25.507 -218.753725 1592.246274 1655.550073 0.01023791
32 -228.544 30.14694631 21.102 -180.978148 1630.021852 1777.942184 0.010467884
33 -268.616 35.43279251 24.802 -212.71014 1598.28986 1793.052053 0.010496276
34 -283.528 37.39981533 26.179 -224.518571 1586.481429 1823.163191 0.010552855
35 -244.504 32.25220947 25.801 -221.275958 1589.724041 1817.458075 0.010542135
36 -193.888 25.57551774 20.460 -175.468512 1635.531488 1794.080132 0.010498208
37 -190.656 25.14918876 20.119 -172.543554 1638.456446 1823.481751 0.010553453
38 -122.152 16.11291386 12.890 -110.547479 1700.452521 1871.482916 0.010643647
39 -121.4 16.01371851 12.810 -109.866919 1701.13308 1925.218157 0.010744616
40 -78.136 10.30681968 8.245 -70.7130284 1740.286972 1916.884923 0.010728958
41 17.704 -2.33531196 -1.868 16.02210832 1827.022108 1916.088523 0.010727461
42 35.448 -4.67590027 -3.740 32.08041662 1843.080417 1961.78737 0.010813329
43 -13.368 1.763355758 1.410680 -12.0980311 1798.901969 1942.847544 0.010777741
44 91.696 -12.0955019 -9.676 82.98481952 1893.98482 1988.662231 0.010863827
45 107.44 -14.1722727 -11.3378 97.23312914 1908.233129 2007.088017 0.010898449
46 53.912 -7.11146286 -5.689 48.79032444 1859.790324 1961.72945 0.01081322
47 56.56 -7.46075715 -5.968 51.1867627 1862.186763 1922.669679 0.010739827
48 147.904 -19.5098272 -15.607 133.8530225 1944.853022 1918.492202 0.010731978
In terms of actual effect, the 11st passage(Final pass)After each section of corresponding setting value setup algorithm, whole thickness Degree fluctuation significantly reduces, and thickness control accuracy is within the scope of 0.1mm, far more than the precision of original 0.3 ~ 0.4mm.
Note that due to the reversing tandem rolling that Medium and Heavy Plate Rolling uses, data record is rolled since the 10th passes, That is what the afterbody of steel plate started;And the setting value of the 11st passage should be calculated since the head of steel plate, therefore, data record Sequencing needs to exchange.This is also the difference of each point setting value and final setting value in table 3.

Claims (4)

1. a kind of new Medium and Heavy Plate Rolling Production process dynamics become setting control method, exist for hot rolled steel plate production field Line setting control system, which is characterized in that the described method includes rolling schedule calculation module, passage number and segment length's chosen module, Actual value records and processing module, the detecting of actual roll-force, the detection of actual roll gap, draught pressure deviation computing module, temperature Spend deviation computing module, temperature computation module, new settings computing module;
The regulation computing module is according to actual device parameter, slab and trimmed size parameter, is calculated according to certain algorithm Passage setting regulation out;
The passage number and segment length's chosen module are this method used according to the length of rolling procedure and rolling outlet steel plate The segment length of home record passage and corresponding each steel plate section;
In the actual value record and processing module, the detection of actual roll-force is surveyed using oil pressure sensor or pressure-measuring head The actual roll-force of amount;
In the actual value record and processing module, the detection of actual roll gap is to use the actual roll gap of displacement sensor;
Each section of draught pressure deviation computing module rolls pressure according to caused by the actual draught pressure of sampling, roll gap adjustment Each section of the draught pressure deviation that power, setting Rolling Pressure Calculation go out;
The passage temperature deviation computing module is that the temperature calculated with partial differential along steel plate length is calculated according to rolling deviation Degree distribution;
The temperature computation module refers to after passage gap, the temperature drop of each section of steel plate;
The new settings module is that the temperature that basis is newly calculated recalculates the draught pressure setting of each length section, roll gap is set It is fixed;
It is that the corresponding setting value of each length section is sent to executing agency that the setting value, which is sent to actuator module,.
2. passage dynamic according to claim 1 becomes setting control method, it is characterised in that:Independent of temperature monitor Table is calculated along the deformation temperature in steel plate length direction by the draught pressure deviation for sampling section and is distributed.
3. passage dynamic according to claim 1 becomes setting control method, it is characterised in that:It is selected using this method it Preceding passage(Containing the passage using this method)Using single-point setting value, and passage afterwards becomes setting control using multiple spot dynamic System.
4. passage dynamic according to claim 1 becomes setting control method, it is characterised in that:Multi-pass uses this method, Its segment length sampled can directly be calculated according to reduction ratio, and the multiple spot dynamic setting value of preceding passage is moved as back pass The calculating basis of state setting.
CN201611008823.4A 2016-11-16 2016-11-16 Medium and Heavy Plate Rolling passage dynamic becomes setting control method Active CN108067506B (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5564911A (en) * 1978-11-08 1980-05-16 Mitsubishi Heavy Ind Ltd Rough rolling method
JPS57156824A (en) * 1981-03-24 1982-09-28 Nippon Steel Corp Controlling method for strip temperature in cold rolling
CN102371279A (en) * 2010-08-26 2012-03-14 宝山钢铁股份有限公司 Adaptive control method for increasing thickness precision of finish-rolled band steel by utilizing roll gap
CN102941232A (en) * 2012-11-12 2013-02-27 东北大学 Method for controlling hot continuous rolling finish rolling process
CN103028615A (en) * 2012-11-29 2013-04-10 一重集团大连设计研究院有限公司 Method for predicting temperature evolution in hot continuous rolling process of strip steel

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5564911A (en) * 1978-11-08 1980-05-16 Mitsubishi Heavy Ind Ltd Rough rolling method
JPS57156824A (en) * 1981-03-24 1982-09-28 Nippon Steel Corp Controlling method for strip temperature in cold rolling
CN102371279A (en) * 2010-08-26 2012-03-14 宝山钢铁股份有限公司 Adaptive control method for increasing thickness precision of finish-rolled band steel by utilizing roll gap
CN102941232A (en) * 2012-11-12 2013-02-27 东北大学 Method for controlling hot continuous rolling finish rolling process
CN103028615A (en) * 2012-11-29 2013-04-10 一重集团大连设计研究院有限公司 Method for predicting temperature evolution in hot continuous rolling process of strip steel

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