CN108067506B - 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
CN108067506B
CN108067506B CN201611008823.4A CN201611008823A CN108067506B CN 108067506 B CN108067506 B CN 108067506B CN 201611008823 A CN201611008823 A CN 201611008823A CN 108067506 B CN108067506 B CN 108067506B
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Prior art keywords
passage
rolling
setting
steel plate
temperature
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Expired - Fee Related
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CN201611008823.4A
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Chinese (zh)
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CN108067506A (en
Inventor
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 invention patent becomes setting control method, and fields are that ferrous metal and non-ferrous metal roll control technology field.For cut deal when rolling specified passage, the present invention uses Temperature Prediction calculation method, calculates the distribution that temperature prolongs steel plate length direction according to Temperature affection factor method along the distribution of steel plate length according to actual measurement draught pressure.After the completion of passes, according to temperature fall model, when calculating next passes, temperature along steel plate length direction distribution, draught pressure, the roll gap, bending roller force for prolonging the dynamic change setting control in steel plate length direction are recalculated using the method for Temperature affection factor, the rolling for controlling lower a time 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 the novel process control passage of one kind and set Determine calculation method, especially becomes setting control in line computation dynamic, improve the stability of production process and the dimensional accuracy of product.
Background technique
When Medium and Heavy Plate Rolling, by thick slab rolling at the lesser finished product plate of thickness, due to milling equipment ability Limitation, can not disposable roll forming, need repeatedly reciprocal rolling could obtain final finished product thickness, the primary title of every rolling For a passage, each passage is borne by the reduction in thickness of a part.During the rolling process, uneven due to temperature, it is past Toward biggish thickness deviation is generated, the quality of product is influenced.When Strip hot rolling, Temperature Distribution is usually head and tail temperature Lower, middle portion temperature is higher, and for longer steel plate (30m or more), 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 head, tail thickness partially thick, interior thickness is partially thin.
Current hot rolled plate band all uses computer control system and controls the entire operation of rolling, to rolling Cheng Jinhang high-precision setting obtains 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 is first given before steel rolling according to the plate kind of production, the specification of specification and blank The pre-set value of the Main physical amount of rolling pass sum and each passage out.The numerical value of presetting physical quantity is in production process In, dynamic corrections are carried out according to numerical value of the actual conditions of rolling to presetting each physical quantity, to obtain preferable control effect.
When hot rolled plate band Rolling Production, since kind, specification, heating cycle of production etc. change, temperature is 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 (i.e. in each passes, only with multiple changeless setting values, such as changeless setting draught pressure is set method Fixed roll seam, bending roller force etc., i.e., remain unchanged with the setting value of a time), even if having passage setting using head, in, three sections of tail set 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 adverse effect to final product thickness precision, especially 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 difficult to obtain high-precision change setting, and therefore, 3 points of settings of domestic many rolling line designs, which there is no, to come into operation.
Summary of the invention
The technical problems to be solved by the present invention are: proposing a kind of new method, establishes dynamic and become setup algorithm mould The Temperature Distribution along steel plate length direction is precisely calculated using the rolling information of front passage 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 longer situation of plate.
Medium and Heavy Plate Rolling generally uses the reciprocal roll forming of multi-pass.In production process, it can use front passes 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 the length records of length and middle part end to end, and carry out to these information Processing, by treated, these Information applications are modified to back pass, so that it may be reached and be improved back pass setting accuracy Purpose.
In certain passage such as i passage (non-final pass) 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 this regular length segment limit as corresponding points Pressure value, while recording 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 passage is set Fixed draught pressure is, set roll gap as, each fixed length segment is denoted as(k=1,2…n).It can be with by formula (1) It obtains i passage and respectively records the draught pressure variation that some roll gap adjustments generate.
(1)
(1) in formula, M is mill modulus, and Q is the plastic coefficient of steel plate.It is disturbed thus, it is possible to calculate the true external world Draught pressure deviation caused by dynamic, 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, roller radius function, 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 Degree, V is rolling mill speed, and R is roller radius.
(3) total differential is taken, can be obtained:
(4)
It is available (5) by (4):
(5)
The corresponding temperature deviation of each point of i passage can be calculated according to (5) formula as a result,, thus, it is possible to calculate The corresponding temperature value of each point (), to depict the Temperature Distribution along steel plate length direction with each point connecting line Curve.
For i+1 passage, (temperature fall model can be with reference to each by temperature fall model for the temperature spot of the n point obtained by i passage Class rolls textbook) it calculates, new temperature calculations are obtained, for the draught pressure setup algorithm of i+1 passage, are thus calculated The roll gap of corresponding each point is set.The outlet of i-th passage is the entrance of i+1 passage.
In the case where other conditions are constant, each corresponding points setting rolling pressure can also be calculated with the reduced form of (4) Power deviation, it may be assumed that,For by the temperature deviation after passage temperature drop.It calculatesValue is used 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 subsequent steel plate rolling.
Implementation steps of the invention are as follows:
1, calculate steel plate rolling procedure, obtain each passage presetting (One-Point-Value, Pei, Sei etc.) and each passage pair The partial differential coefficient answered;
2, the passage i for selecting start recording, generally requires the steel plate length of the passage to be no less than 10m, in the passage Passage before (containing this passage) all uses single-point setting method;
3, fixed length segment L is selected;
4, the practical rolling average pressure P being recorded in k-th of length section Lik, actual average roll gap Sik
5, setting roll gap and practical roll gap deviation S are calculatedei-Sik
6, draught pressure variation caused by roll gap adjusts is calculated according to (1) formula
7, the variation of draught pressure caused by external disturbance is calculated according to (2) formula
8, the temperature change of each length section L is calculated according to (5) formula
9, the temperature point value of i passage is calculated;
10, the inlet temperature deviation of each fixed length segment of i+1 passage is calculated by temperature fall model
11, the draught pressure deviation of the corresponding point of i+1 passage point is calculated using the reduced form of formula (4)
12, the sum of draught pressure initially set and each length section draught pressure deviation newly calculated, i.e.,, actual it is set for controlling as each section.
13, when new settings value issues, consider the rolling direction of selection passage i, if i is positive (odd-numbered pass), The numerical value newly calculated is also required to carry out tandem exchange processing according to i+1 passage direction (reversed passage).According to different sections It is long to send different setting values, thus become multiple spot dynamic and sets.
14, the step of repeating 2 ~ 13 terminates up to rolling, available higher setting accuracy.Hereafter the setting of each passage Value is all the setting of each corresponding segment, becomes multiple spot dynamic and sets.
Detailed description of the invention Fig. 1 is the composition schematic diagram of the invention patent.
Case study on implementation
Certain Heavy Plate Plant Rolling Production A class deck of boat, steel plate target length are 12mm, target width 2470mm, target length For 50m;Supplied materials length is 4.05m, and width 2470mm, supplied materials is with a thickness of 150mm.
Calculated initial rolling procedure table (component values, other rollers etc. are not in it) such as table 1.
1 initial calculation rolling procedure table of table
For the effect for investigating this method, according to the data in table 1, come into operation this method when choosing 10 passes, and the 10th Passage before passage (containing the 10th passage) still uses single-point to set.10th passage is even-numbered pass, and segment length takes 1m, according to base Plinth automates the sample frequency 25ms of L1, and mill speed calculates according to 4m/s, and every section can collect 10 or so point (middle thickness Plate mill speed 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 be sent to Process Control System) is 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
By in table 2 and the tables of data of setting data and formula (1) ~ (5) and temperature fall model can calculate phase together The temperature of the external disturbance, temperature deviation, the 11st passage each point that should put, setting value such as table 3.
The calculated value of each section of table 3 the 10th, 11 passages corresponding points
It is whole after the 11st passage (final pass) is according to each section of corresponding setting value setup algorithm in terms of actual effect Thickness fluctuation significantly reduce, thickness control accuracy is within the scope of 0.1mm, far more than the precision of original 0.3 ~ 0.4mm.
Note that data record is rolled since the 10th passes due to the reversing tandem rolling that Medium and Heavy Plate Rolling uses, That is what the tail portion 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 Medium and Heavy Plate Rolling Production process dynamics become setting control method, it to be used for hot rolled steel plate production field on-line setup Control system, which is characterized in that the method includes rolling schedule calculation module, passage number and segment length's chosen module, actual value Record and processing module, each section of draught pressure deviation computing module select passage temperature deviation computing module, warm extrusion die mould Block selectes each section of preset value calculation module of lower a time of passage;
The rolling schedule calculation module is according to actual device parameter, slab and trimmed size parameter, according to certain algorithm The passage setting regulation calculated;
Passage number and selected segment length in the passage number and segment length's chosen module are according to rolling procedure and rolling outlet steel plate Length, using the starting passage number of record and the segment length of corresponding each steel plate section;
It include practical draught pressure, practical roll gap in actual value record and processing module, the detection of practical draught pressure, It is the practical roll-force measured using oil pressure sensor or pressure-measuring head;
In the actual value record and processing module, the detection of practical roll gap is the practical roll gap using displacement sensor;
Each section of draught pressure deviation computing module is according to caused by the practical draught pressure of sampling, the adjustment of practical roll gap Each steel plate section draught pressure deviation that draught pressure, setting Rolling Pressure Calculation go out;
The selected passage temperature deviation computing module be according to rolling deviation calculate and partial differential calculate it is long along steel plate The Temperature Distribution of degree;
The warm extrusion die module refers to that steel plate passes through after the cooling of passage gap, the temperature drop of each steel plate section;
Each section of preset value calculation module of lower a time of the selected passage is recalculated according to the temperature newly calculated Each steel plate section setting draught pressure, setting roll gap.
2. Medium and Heavy Plate Rolling Production process dynamics according to claim 1 become setting control method, it is characterised in that: disobey Rely in temperature instrument, the draught pressure deviation by sampling section calculates the Temperature Distribution along steel plate length direction.
3. Medium and Heavy Plate Rolling Production process dynamics according to claim 1 become setting control method, it is characterised in that: selecting Surely become the passage before setting using rolling pass dynamic, containing the passage for becoming setting using rolling pass dynamic, set using single-point Definite value, and passage later becomes set value calculation using multiple spot dynamic.
4. Medium and Heavy Plate Rolling Production process dynamics according to claim 1 become setting control method, it is characterised in that: multiple tracks Setting, calculating base of the multiple spot dynamic setting value of preceding passage as back pass dynamic setting are become using rolling pass dynamic when secondary Plinth.
CN201611008823.4A 2016-11-16 2016-11-16 Medium and Heavy Plate Rolling passage dynamic becomes setting control method Expired - Fee Related 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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