CN111360082A - Method for distributing rolling reduction in case of lack of five-stand cold continuous rolling - Google Patents

Method for distributing rolling reduction in case of lack of five-stand cold continuous rolling Download PDF

Info

Publication number
CN111360082A
CN111360082A CN201811596423.9A CN201811596423A CN111360082A CN 111360082 A CN111360082 A CN 111360082A CN 201811596423 A CN201811596423 A CN 201811596423A CN 111360082 A CN111360082 A CN 111360082A
Authority
CN
China
Prior art keywords
thickness
stand
rack
rolling
outlet
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201811596423.9A
Other languages
Chinese (zh)
Inventor
汤红生
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shanghai Meishan Iron and Steel Co Ltd
Original Assignee
Shanghai Meishan Iron and Steel Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shanghai Meishan Iron and Steel Co Ltd filed Critical Shanghai Meishan Iron and Steel Co Ltd
Priority to CN201811596423.9A priority Critical patent/CN111360082A/en
Publication of CN111360082A publication Critical patent/CN111360082A/en
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/16—Control of thickness, width, diameter or other transverse dimensions
    • B21B37/18—Automatic gauge control
    • B21B37/20—Automatic gauge control in tandem mills

Abstract

The invention relates to a method for distributing rolling reduction in the absence of a five-stand cold continuous rolling stand, which comprises the following steps of: step one, according to the inlet thickness of a five-stand continuous rolling millh 0And outlet thicknessh 5Obtaining the average reduction rate; step two, according to the reduction ratio coefficient of each rack in normal work, setting the reduction ratio coefficient of the rack adopting the air passing mode as 0, and calculating to obtain the initial reduction rate of each rack; step three, respectively calculating the thickness of a temporary outlet of each rack according to the thickness of incoming materials at the inlet of the rolling mill; step four, calculating the precision of the target outlet thickness, wherein if the precision meets the requirement, the temporary outlet thickness of each rack is the corrected outlet thickness of each rack; otherwise, correcting the reduction rate of each frame by the difference between the target outlet thickness and the temporary outlet thickness of the No. 5 frame, and then returning to execute the third step. When one middle stand has a fault, the invention adopts the other four stands to complete the rolling function and can provide the product quality close to that of the common rolling of five stands.

Description

Method for distributing rolling reduction in case of lack of five-stand cold continuous rolling
Technical Field
The invention relates to a method for distributing the reduction in the absence of a five-stand cold continuous rolling mill, belonging to the technical field of automatic control of cold continuous rolling mills.
Background
At present, a rolling mill of a cold rolling acid rolling unit of an iron and steel plant adopts a five-stand continuous rolling production mode. If a rolling mill of a certain stand in five continuously rolling stands fails due to equipment, machinery and the like, production can not be organized before the failure is recovered, an acid rolling unit is a finished product unit and a feeding unit of other strip mill production lines for cold rolling, and production organization arrangement of the whole cold rolling process can not be carried out when the acid rolling is stopped for a long time due to the failure of the certain stand, particularly major failure.
Disclosure of Invention
The invention aims to solve the technical problems that: provided is a rolling reduction distribution method when a frame is missing in five-frame cold continuous rolling, which can continuously roll by using the remaining four frames when a certain frame fails so as to maintain continuous production of a pickling line.
In order to solve the technical problems, the technical scheme provided by the invention is as follows: a method for distributing the rolling reduction of five-stand cold continuous rolling lacking stand, wherein one stand of 2-4 stands is in a passing-through mode, namely the outlet thickness of the stand is consistent with the outlet thickness of the previous stand, and the method comprises the following steps:
step one, according to the inlet thickness h of a five-stand continuous rolling mill0And outlet thickness h5Obtaining an average reduction ratio:
Figure BDA0001921427880000011
step two, according to the reduction ratio coefficient A of each rack in normal operationiSetting the reduction ratio coefficient of the rack adopting the air passing mode as 0, and calculating to obtain the initial reduction rate epsilon of each racki:
Figure BDA0001921427880000012
In the formula, i ∈ [1,5]；
Step three, according to the thickness h of the incoming material at the inlet of the rolling mill0Let h0，0＝h0And respectively calculating the thickness of a temporary outlet of each rack:
hi,0＝hi-1,0×(1-εi) In the formula, i ∈ [1,5]；
Step four, calculating the thickness h of the target outlet5Accuracy of (2)
Figure BDA0001921427880000013
If D is satisfied<Delta, delta is a preset threshold value, then hi,0I.e. the corrected outlet thickness of each rack, i ∈ [1,5 ]](ii) a Otherwise pass h5And h5,0The difference between the values is used for correcting the pressing rate of each frame, β is used as a correction coefficient, and the correction coefficient is taken
Figure BDA0001921427880000014
α is used as a preset value to be set,
will epsiloni×β new reduction rate epsilon of each frameiAnd then returning to execute the third step.
Preferably, 0.85. ltoreq. α. ltoreq.0.95 and Δ. ltoreq.0.0000001.
At present, in a five-stand rolling mill of an acid rolling mill group, a first stand is a strip steel inlet threading stand, a fifth stand is a strip steel outlet stand with target thickness, and the first stand and the fifth stand are respectively key stands for controlling the thickness and the plate type. If the acid rolling unit can have the function of a four-stand continuous rolling model, namely when one stand of the acid rolling mill has equipment failure, the remaining four stands can be used for continuous rolling, and the continuous production of an acid rolling operation line is maintained. Therefore, the invention mainly considers the condition that one of the racks 2-4 is empty, in the calculation process, the empty rack is only used as a virtual rack, the outlet thickness of the empty rack is consistent with the outlet thickness of the front rack, the outlet strip steel speed is the strip steel outlet speed of the front rack, and the control parameters of the strip steel outlet speed, the roll speed and the like of other racks are calculated through the second flow balance control principle, so that the rolling reduction is reasonably distributed to the remaining four racks under the condition that one middle rack is a fault rack, a new rolling procedure is formed, and the product quality meets the requirements of users.
The invention keeps the thickness of the inlet and the thickness of the outlet of the empty stand unchanged, reasonably distributes the rolling reduction of one fault stand to the remaining four stands to form a new rolling regulation, when one middle stand has a fault, the remaining four stands complete the rolling function, and can provide the product quality close to that of the common rolling of five stands. In addition, the rolling of the empty stand can be used as a conventional rolling mode for rolling thicker products, and the rolling mill has the advantages that the consumption of a roller, emulsion and the like is saved, the power consumption of a main transmission motor and a fan can be saved, the consumption of other spare parts is reduced, and the purpose of reducing the production cost is achieved.
Detailed Description
Examples
The embodiment is applied to automatic control of a five-stand six-roller UCM acid rolling mill for the plum steel 1420, and can also be applied to other types of rolling mills on the basis of adjusting the reduction ratio coefficient. The equipment parameters of the plum steel 1420 five-stand six-roller UCM acid rolling mill are shown in Table 1:
TABLE 1
Serial number Device name Parameter(s)
1 Work roll size mm φ435/φ385X1420
2 Intermediate roll size mm φ490/φ440X1400
3 Size mm of support roller φ1300/φ1150×1420
4 Motor power kw 4600
5 Motor speed rpm 400/1200
6 Roll shifting amount mm of intermediate roll 0/380
7 Work roll bending kn -180/400
8 Intermediate roll bending kn 10/500
In the acid rolling production, the product specifications are many, in order to facilitate the rolling reduction calculation, the product is divided into different grades according to different product widths and thicknesses by combining the product outline of a rolling mill, and the dividing method comprises the following steps: the width of the strip steel is divided into 12 width grades according to different widths, and each width grade is divided into 22 thickness grades according to the outlet thickness.
In the embodiment, the No. 2 machine frame is empty, the rolled steel grade is AQ0511K1, the inlet is 2.5mm, the width is 1201mm, and the outlet thickness is 0.583 mm.
The pressing amount distribution method of the embodiment comprises the following steps:
step one, as mentioned previously, the inlet thickness of the stands is 2.5mm and the outlet thickness is 0.583mm according to the inlet thickness h of a five-stand continuous rolling mill0And outlet thickness h5Obtaining an average reduction ratio:
Figure BDA0001921427880000031
step two, according to the normal working of each rackReduction ratio coefficient Ai(the reduction ratio coefficients of the five stands in normal operation can be obtained from the existing automatic control system of the sour rolling mill, which is the prior art and is not described in detail), and the reduction ratio coefficients of the stands adopting the idle mode are set to be 0, so that the reduction ratio coefficient tables of the five stands are obtained as shown in table 2. According to the outlet width 1201mm and the outlet thickness 0.583mm of the strip steel, inquiring the table 2 to calculate the initial reduction rate epsilon of each framei:
TABLE 2
Figure BDA0001921427880000032
Figure BDA0001921427880000041
In the formula, i ∈ [1,5]；
ε1～ε5The approximate values of (a) are 0.3772, 0.0, 0.3323, 0.3124, 0.2409, respectively.
Step three, according to the thickness h of the incoming material at the inlet of the rolling mill0Let h0，0＝h0And respectively calculating the thickness of a temporary outlet of each rack:
hi,0＝hi-1,0×(1-εi) In the formula, i ∈ [1,5]；
The temporary exit thicknesses of the No. 1-5 racks were 1.5568, 1.5568, 1.0393, 0.7143, 0.5424, respectively.
Step four, calculating the thickness h of the target outlet5Accuracy of (2)
Figure BDA0001921427880000042
If D is satisfied<Δ, Δ is 0.00000001, then hi,0I.e. the corrected outlet thickness of each rack, i ∈ [1,5 ]](ii) a Otherwise, pass h5And h5,0The difference between the values is used for correcting the pressing rate of each frame, β is used as a correction coefficient, and the correction coefficient is taken
Figure BDA0001921427880000043
α is used as a preset value to be set,
will epsiloni×β new reduction rate epsilon of each frameiAnd then returning to execute the third step.
In the present example, it is apparent that
Figure BDA0001921427880000044
I.e. D>0.00000001, therefore using h5And h5,0The difference between the two frames is used to correct the pressing rate and the correction coefficient of each frame
Figure BDA0001921427880000045
And (4) obtaining corrected values of the 1-5# rack reduction rate, namely 0.3723, 0.0, 0.3280, 0.3084 and 0.2378 respectively, and then returning to execute the step three.
Through 36 iterations, the target outlet thickness h is obtained5The accuracy D of (2) was satisfied, and the outlet thicknesses of the No. 1-5 stands were determined to be 1.5934, 1.5934, 1.0843, 0.7587, and 0.5830, respectively, and the draft of the No. 1-5 stands were determined to be 36.3, 0.0, 31.9, 30.0, and 23.2, respectively.
Example two
In this example, the 4# stand was empty, rolled steel grade AQ0511K1, 2.5mm inlet, 1002mm width, 0.59mm outlet thickness.
The pressing amount distribution method of the embodiment comprises the following steps:
step one, as mentioned previously, the inlet thickness of the stands is 2.5mm and the outlet thickness is 0.59mm according to the inlet thickness h of a five-stand continuous rolling mill0And outlet thickness h5Obtaining an average reduction ratio:
Figure BDA0001921427880000046
step two, according to the reduction ratio coefficient A of each rack in normal operationi(the reduction ratio coefficients of the five stands in normal operation can be obtained from the existing automatic control system of the sour rolling mill, which is the prior art and is not described in detail), and the reduction ratio coefficients of the stands adopting the idle mode are set to be 0, so that the reduction ratio coefficient tables of the five stands are obtained as shown in table 3. According to the outlet width 1201mm and the outlet of the strip steelThe thickness is 0.583mm, the rolling reduction ratio coefficients of No. 1 to No. 5 frames of the steel grades of the specification are respectively 22.7, 24.0, 20.0, 0.0 and 14.5 by looking up a table 3, and the initial rolling reduction epsilon of each frame is calculatedi:
TABLE 3
Figure BDA0001921427880000051
Figure BDA0001921427880000052
In the formula, i ∈ [1,5]；
ε1～ε5Are 0.3514, 0.3715, 0.3096, 0.0, 0.2245, respectively.
Step three, according to the thickness h of the incoming material at the inlet of the rolling mill0Let h0，0＝h0And respectively calculating the thickness of a temporary outlet of each rack:
hi,0＝hi-1,0×(1εi) In the formula, i ∈ [1,5]；
The temporary exit thicknesses of the No. 1-5 racks were 1.6213, 1.0188, 0.7033, 0.7033, 0.5454, respectively.
Step four, calculating the thickness h of the target outlet5Accuracy of (2)
Figure BDA0001921427880000061
If D is satisfied<Δ, Δ is 0.00000001, then hi,0I.e. the corrected outlet thickness of each rack, i ∈ [1,5 ]](ii) a Otherwise, pass h5And h5,0The difference between the values is used for correcting the pressing rate of each frame, β is used as a correction coefficient, and the correction coefficient is taken
Figure BDA0001921427880000062
α is used as a preset value to be set,
will epsiloni×β new reduction rate epsilon of each frameiAnd then returning to execute the third step.
In the present example, it is apparent that
Figure BDA0001921427880000063
I.e. D>0.00000001, therefore using h5And h5,0The difference between the two frames is used to correct the pressing rate and the correction coefficient of each frame
Figure BDA0001921427880000064
And (4) obtaining corrected values of the 1-5# rack reduction rate, namely 0.3465, 0.3663, 0.3053, 0.0 and 0.2213 respectively, and then returning to execute the step three.
Through 34 iterations, the target outlet thickness h is obtained5The accuracy D of (2) was satisfied, and the outlet thicknesses of the No. 1-5 stands were determined to be 1.6585, 1.0683, 0.7515, 0.7515, and 0.5899, respectively, and the draft of the No. 1-5 stands were determined to be 33.6, 35.6, 29.7, 0.0, and 21.5, respectively.
The present invention is not limited to the specific technical solutions described in the above embodiments, and other embodiments may be made in the present invention in addition to the above embodiments. It will be understood by those skilled in the art that various changes, substitutions of equivalents, and alterations can be made without departing from the spirit and scope of the invention.

Claims (3)

1. A method for distributing the rolling reduction of five-stand cold continuous rolling lacking stand, wherein one stand of 2-4 stands is in a passing-through mode, namely the outlet thickness of the stand is consistent with the outlet thickness of the previous stand, and the method comprises the following steps:
step one, according to the inlet thickness h of a five-stand continuous rolling mill0And outlet thickness h5Obtaining an average reduction ratio:
Figure FDA0001921427870000011
step two, according to the reduction ratio coefficient A of each rack in normal operationiSetting the reduction ratio coefficient of the rack adopting the air passing mode as 0, and calculating to obtain the initial reduction rate epsilon of each racki：
Figure FDA0001921427870000012
In the formula, i ∈ [1,5]；
Step three, according to the thickness h of the incoming material at the inlet of the rolling mill0Let h0，0＝h0And respectively calculating the thickness of a temporary outlet of each rack:
hi，0＝hi-1，0×(1-εi) In the formula, i ∈ [1,5]；
Step four, calculating the thickness h of the target outlet5Accuracy of (2)
Figure FDA0001921427870000013
If D is satisfied<Δ, where Δ is a predetermined threshold, then hi，0I.e. the corrected outlet thickness of each rack, i ∈ [1,5 ]](ii) a Otherwise pass h5And h5，0The difference between the values is used for correcting the pressing rate of each frame, β is used as a correction coefficient, and the correction coefficient is taken
Figure FDA0001921427870000014
d is a preset value and is used as the reference value,
will epsiloni×β new reduction rate epsilon of each frameiAnd then returning to execute the third step.
2. The draft distribution method in the absence of stands in five-stand cold continuous rolling according to claim 1, wherein 0.85. ltoreq. α. ltoreq.0.95.
3. The draft distribution method in the absence of stands in five-stand cold continuous rolling according to claim 1, wherein: delta is less than or equal to 0.0000001.
CN201811596423.9A 2018-12-26 2018-12-26 Method for distributing rolling reduction in case of lack of five-stand cold continuous rolling Pending CN111360082A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201811596423.9A CN111360082A (en) 2018-12-26 2018-12-26 Method for distributing rolling reduction in case of lack of five-stand cold continuous rolling

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201811596423.9A CN111360082A (en) 2018-12-26 2018-12-26 Method for distributing rolling reduction in case of lack of five-stand cold continuous rolling

Publications (1)

Publication Number Publication Date
CN111360082A true CN111360082A (en) 2020-07-03

Family

ID=71200046

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201811596423.9A Pending CN111360082A (en) 2018-12-26 2018-12-26 Method for distributing rolling reduction in case of lack of five-stand cold continuous rolling

Country Status (1)

Country Link
CN (1) CN111360082A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114393033A (en) * 2021-12-17 2022-04-26 天津市新宇彩板有限公司 Rolling method for rolling 0.24mm ultrathin material by acid continuous rolling unit
CN114833195A (en) * 2022-03-28 2022-08-02 武汉钢铁有限公司 Cold rolling method for producing high-grade non-oriented silicon steel based on UCMW cold continuous rolling mill

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004268071A (en) * 2003-03-06 2004-09-30 Hitachi Ltd Method and device for controlling thickness in tandem rolling mill
JP2009000742A (en) * 2007-06-20 2009-01-08 Kaji Abe Method of controlling plate thickness difference in plate width direction in hot strip mill
CN101733289A (en) * 2009-12-23 2010-06-16 北京理工大学 Method for dynamically setting tandem rolling schedule of hot rolling strip
CN101934288A (en) * 2009-06-30 2011-01-05 上海宝信软件股份有限公司 Cold continuous rolling reduction distribution method
CN103357670A (en) * 2012-03-27 2013-10-23 上海梅山钢铁股份有限公司 Reduction schedule optimizing method applicable to five-stand UCM (universal crown mill) type cold continuous rolling unit
CN104324949A (en) * 2014-11-14 2015-02-04 北京金自天正智能控制股份有限公司 Acquisition method for vertical roll opening degree of rough rolling vertical roll pass
CN104785538A (en) * 2014-01-21 2015-07-22 宝山钢铁股份有限公司 Reduction schedule optimization method for rolling ultrathin strip steel by cold continuous rolling set
CN107199247A (en) * 2016-03-18 2017-09-26 上海梅山钢铁股份有限公司 A kind of five Stands Cold Tandem Mill lacks the control method of frame rolling

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004268071A (en) * 2003-03-06 2004-09-30 Hitachi Ltd Method and device for controlling thickness in tandem rolling mill
JP2009000742A (en) * 2007-06-20 2009-01-08 Kaji Abe Method of controlling plate thickness difference in plate width direction in hot strip mill
CN101934288A (en) * 2009-06-30 2011-01-05 上海宝信软件股份有限公司 Cold continuous rolling reduction distribution method
CN101733289A (en) * 2009-12-23 2010-06-16 北京理工大学 Method for dynamically setting tandem rolling schedule of hot rolling strip
CN103357670A (en) * 2012-03-27 2013-10-23 上海梅山钢铁股份有限公司 Reduction schedule optimizing method applicable to five-stand UCM (universal crown mill) type cold continuous rolling unit
CN104785538A (en) * 2014-01-21 2015-07-22 宝山钢铁股份有限公司 Reduction schedule optimization method for rolling ultrathin strip steel by cold continuous rolling set
CN104324949A (en) * 2014-11-14 2015-02-04 北京金自天正智能控制股份有限公司 Acquisition method for vertical roll opening degree of rough rolling vertical roll pass
CN107199247A (en) * 2016-03-18 2017-09-26 上海梅山钢铁股份有限公司 A kind of five Stands Cold Tandem Mill lacks the control method of frame rolling

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
曹德亮: "梅钢1420酸轧机组压下率分配比模式的模型设计与实现", 《冶金自动化》 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114393033A (en) * 2021-12-17 2022-04-26 天津市新宇彩板有限公司 Rolling method for rolling 0.24mm ultrathin material by acid continuous rolling unit
CN114393033B (en) * 2021-12-17 2024-04-05 天津市新宇彩板有限公司 Rolling method for rolling 0.24mm ultrathin material by acid continuous rolling unit
CN114833195A (en) * 2022-03-28 2022-08-02 武汉钢铁有限公司 Cold rolling method for producing high-grade non-oriented silicon steel based on UCMW cold continuous rolling mill

Similar Documents

Publication Publication Date Title
CN111014307B (en) Rolling mill speed control method for continuous rolling of furnace coil and finishing mill set
CN106475424B (en) A kind of control method of Hot Rolling Strip sideslip
CN111889512B (en) Method for producing thin steel plate by single-stand rolling mill
CN104384199B (en) A kind of control method during cold continuous rolling dynamic variable specification
CN101829687B (en) Method for controlling roll gap of strip steel finishing mill to eliminate influence of specification change
CN101934290B (en) Load allocation adjusting method for stainless steel tandem cold rolling mill
CN103949481B (en) Take into account the flatness Discrete control method of Hot Rolling Strip stability and quality
CN103372575B (en) Pickling and rolling mill load distribution method
CN111360082A (en) Method for distributing rolling reduction in case of lack of five-stand cold continuous rolling
CN112958633B (en) Incoming material camber-based fine rolling strip steel head pre-swing leveling control method
CN106311762B (en) Improve the load distribution method of hot rolled thin strip rolling stability
CN101934288B (en) Cold continuous rolling reduction distribution method
CN114309087B (en) Feed-forward continuous control method for tail deviation of strip steel of finishing mill group
CN108746213A (en) A method of improving high-strength IF steel rolling stability
CN101422785B (en) Method for adjusting middle-roller drunkenness in double cold reduction shadow-mask strip-steel machine
CN114433638A (en) Method for controlling transverse unevenness of hot-rolled steel plate with thickness specification of less than or equal to 50mm
CN111842506B (en) Roll shifting control method for five-frame six-roll cold continuous rolling unit
CN109877167B (en) Tension influence coefficient analysis method for improving rolling stability of degree of freedom
CN111842505A (en) Roll inclination control method for five-frame six-roll cold continuous rolling unit
CN114029345B (en) Method for controlling tail plate shape of hot-rolled rough-rolled intermediate billet
CN106825064B (en) 1549mm milling train sheet metal finish rolling reduction ratio adjusting methods
CN109261727B (en) A kind of the roll shape setting method and system of mkw mill
CN113680829A (en) Novel sickle elbow part pre-control method
CN109226279B (en) Quarter wave plate shape control method for five-frame cold continuous rolling high-strength steel plate strip
CN111001661B (en) Method for optimizing steel strip structure in middle slab rolling process

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
RJ01 Rejection of invention patent application after publication

Application publication date: 20200703

RJ01 Rejection of invention patent application after publication