CN107626750B - A kind of hot-rolling plate band ratio convexity distribution method - Google Patents
A kind of hot-rolling plate band ratio convexity distribution method Download PDFInfo
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Abstract
The invention discloses a kind of hot-rolling plate band ratio convexity distribution methods, belong to Hot Strip Rolling technical field.The hot-rolling plate is with ratio convexity distribution method the following steps are included: the entrance ratio convexity C of mm finishing mill unit F1 rack is calculated0；Obtain the target proportion convexity C of mm finishing mill unit end rack F6 rack6；The total ratio convexity variable quantity △ C of mm finishing mill unit is calculated*；The ratio convexity distribution coefficient λ of each rack of mm finishing mill unit is calculatedn；The ratio convexity sendout △ C of each rack of mm finishing mill unit is calculatedn；The strip export ratio convexity C of each rack of mm finishing mill unit is calculatedn.Hot-rolling plate of the present invention can be in the case where guaranteeing the precondition of the good straightness of each rack and target convexity with ratio convexity distribution method, and maximum plays the plate shape ability of regulation and control of hot tandem.
Description
Technical field
The present invention relates to Hot Strip Rolling technical field, in particular to a kind of hot-rolling plate band ratio convexity distribution method
Background technique
Steel 2250mm Hot Line is moved, it is main to produce automobile cold-reduced sheet, pipe line steel, cylinder steel, cold rolling base, hot rolling commercial coil
Equal steel grades hot-rolled product.The downstream rack of conventional panels shape control strategy is not involved in convexity adjusting at present.It is convex to reduce mm finishing mill unit
The regulating power of degree is unfavorable for the control of finished product target convexity.In addition to this, conventional panels shape control strategy does not account for strip upper
Swimming straightness of the potential deformed steel strip of rack generation on strip in downstream rack influences, as strip is adjusted in upstream stand convexity
The rolling in area may generate potential deformed steel strip, but since strip is thicker, will not appear as apparent deformed steel strip, if downstream machine
Proportionally convexity is constant is rolled for frame, then the potential deformed steel strip that upstream generates can transmit, and steel strip thickness becomes at this time
It is small, it may result in strip and flatness defects occur.It is analyzed based on warping theory research and data, the generation of the bad plate shape of strip
Due to caused by the unreasonable control of convexity, the unreasonable Crown control of any milling train in upstream all can to downstream milling train convexity peace
Straight degree has an impact, and fails the convexity of the Mechanics Cause and upstream stand that consider that strip warpage generates in traditional convexity distribution method
Control domain is too small, therefore traditional convexity distribution method existing defects, influences product strip shape quality.
Summary of the invention
The present invention provides a kind of hot-rolling plate band ratio convexity distribution method, solves or part solves in the prior art
The Crown control domain for failing the Mechanics Cause and upstream stand that consider that strip warpage generates in convexity distribution method is too small, influences to produce
The technical issues of product strip shape quality.
In order to solve the above technical problems, including following the present invention provides a kind of hot-rolling plate band ratio convexity distribution method
Step: the entrance ratio convexity C of mm finishing mill unit F1 rack is calculated0；Obtain the target ratio of mm finishing mill unit end rack F6 rack
Example convexity C6；According to the entrance ratio convexity C of F1 rack0And the target proportion convexity C of mm finishing mill unit end rack F6 rack6It calculates
Obtain the total ratio convexity variation delta C of mm finishing mill unit*；The ratio convexity distribution coefficient of each rack of mm finishing mill unit is calculated
λn；According to obtaining the ratio convexity distribution coefficient λ of each rack of mm finishing mill unitnThe ratio of each rack of mm finishing mill unit is calculated
Convexity sendout Δ Cn；According to the ratio convexity sendout Δ C of each rack of obtained mm finishing mill unitnMm finishing mill unit is calculated
Each rack strip export ratio convexity Cn。
Further, the entrance ratio convexity C that mm finishing mill unit F1 rack is calculated0Include:Wherein, h described in formula0For roughing extreme trace time exit thickness；The P0For rolling
Power；The Cw0For the synthesis convexity of rough rolling working roll；The Cb0For the synthesis convexity of roughing backing roll；The kh0Enter for supplied materials
Mouth thickness effect coefficient, value range 0.9-1.1；The kp0For the stiffness coefficient of roughing mill；The kw0It is convex for working roll synthesis
Degree influences coefficient, value range 0.75-1.25；The kb0Coefficient, value range 0.75- are influenced for the comprehensive convexity of backing roll
1.25。
Further, the entrance ratio convexity C according to F1 rack0And the target ratio of mm finishing mill unit end rack F6 rack
Example convexity C6The total ratio convexity variation delta C of mm finishing mill unit is calculated*Include:
ΔC*=C6-C0。
Further, the ratio convexity distribution coefficient λ that each rack of mm finishing mill unit is calculatednInclude:Wherein, h described in formulanFor the exit thickness of mm finishing mill unit the n-th rack strip；The wnFor mm finishing mill unit
The exit width of n-th rack strip；The α is strip buckle limit coefficient, general value 1.86-2.00 in hot continuous rolling.
Further, the basis obtains the ratio convexity distribution coefficient λ of each rack of mm finishing mill unitnFinish rolling is calculated
The ratio convexity sendout Δ C of each rack of unitnIt include: Δ Cn=βn·λn·ΔC*；Wherein, β described in formulanFor finishing mill
The n-th rack ratio convexity of group distributes adjustment factor, value range 0.8-1.2.
Further, the ratio convexity sendout Δ C for each rack of mm finishing mill unit that the basis obtainsnEssence is calculated
The strip export ratio convexity C of each rack of milling train groupnIt include: Cn=Cn-1+ΔCn；Wherein, C described in formulanFor finishing mill
The export ratio convexity of the n-th rack strip of group；The Cn-1For the export ratio convexity of mm finishing mill unit the (n-1)th rack strip；It is described
ΔCnThe ratio convexity sendout of the n-th rack of mm finishing mill unit.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
Since the entrance ratio convexity C of mm finishing mill unit F1 rack is calculated0, obtain mm finishing mill unit end rack F6 rack
Target proportion convexity C6, according to the entrance ratio convexity C of F1 rack0And the target proportion convexity of mm finishing mill unit end rack F6 rack
C6The total ratio convexity variation delta C of mm finishing mill unit is calculated*, the ratio convexity point of each rack of mm finishing mill unit is calculated
Distribution coefficient λn, according to obtaining the ratio convexity distribution coefficient λ of each rack of mm finishing mill unitnThe each rack of mm finishing mill unit is calculated
Ratio convexity sendout Δ Cn, according to the ratio convexity sendout Δ C of each rack of obtained mm finishing mill unitnEssence is calculated
The strip export ratio convexity C of each rack of milling train groupn, realize the reasonable convexity distribution of each rack of hot tandem rolling mill group,
Guarantee the convexity regulating power for playing milling train under the premise of the good straightness of each rack to greatest extent, improves the convex of hot-rolling plate band
Degree and flatness control precision.
Detailed description of the invention
Fig. 1 is flow diagram of the hot-rolling plate provided in an embodiment of the present invention with ratio convexity distribution method；
Fig. 2 is hot-rolling plate band ratio convexity distribution method example schematic provided in an embodiment of the present invention.
Specific embodiment
Referring to Fig. 1, a kind of hot-rolling plate band ratio convexity distribution method provided in an embodiment of the present invention the following steps are included:
Step 1, the entrance ratio convexity C of mm finishing mill unit F1 rack is calculated0。
Step 2, the target proportion convexity C of mm finishing mill unit end rack F6 rack is obtained6。
Step 3, according to the entrance ratio convexity C of F1 rack0And the target proportion convexity C of mm finishing mill unit end rack F6 rack6
The total ratio convexity variation delta C of mm finishing mill unit is calculated*。
Step 4, the ratio convexity distribution coefficient λ of each rack of mm finishing mill unit is calculatedn。
Step 5, according to obtaining the ratio convexity distribution coefficient λ of each rack of mm finishing mill unitnIt is each that mm finishing mill unit is calculated
The ratio convexity sendout Δ C of a rackn。
Step 6, according to the ratio convexity sendout Δ C of each rack of obtained mm finishing mill unitnMm finishing mill unit is calculated
Each rack strip export ratio convexity Cn。
Entrance ratio convexity C of the application specific embodiment since mm finishing mill unit F1 rack is calculated0, obtain finish rolling
The target proportion convexity C of unit end rack F6 rack6, according to the entrance ratio convexity C of F1 rack0And mm finishing mill unit end rack F6
The target proportion convexity C of rack6The total ratio convexity variation delta C of mm finishing mill unit is calculated*, it is each that mm finishing mill unit is calculated
The ratio convexity distribution coefficient λ of a rackn, according to obtaining the ratio convexity distribution coefficient λ of each rack of mm finishing mill unitnIt calculates
To the ratio convexity sendout Δ C of each rack of mm finishing mill unitn, according to the ratio convexity of each rack of obtained mm finishing mill unit point
Dosage Δ CnThe strip export ratio convexity C of each rack of mm finishing mill unit is calculatedn, realize each rack of hot tandem rolling mill group
Reasonable convexity distribution plays the convexity regulating power of milling train to greatest extent under the premise of each rack of guarantee good straightness,
Improve the convexity and flatness control precision of hot-rolling plate band.
Step 1 is discussed in detail.
The entrance ratio convexity C that mm finishing mill unit F1 rack is calculated0Include:
Wherein, h described in formula0For roughing extreme trace time exit thickness；The P0For roll-force；The Cw0For rough rolling working roll
Synthesis convexity；The Cb0For the synthesis convexity of roughing backing roll；The kh0Coefficient, value model are influenced for supplied materials inlet thickness
Enclose 0.9-1.1；The kp0For the stiffness coefficient of roughing mill；The kw0Coefficient, value range are influenced for the comprehensive convexity of working roll
0.75-1.25；The kb0Coefficient, value range 0.75-1.25 are influenced for the comprehensive convexity of backing roll.
Step 3 is discussed in detail.
The entrance ratio convexity C according to F1 rack0And the target proportion convexity C of mm finishing mill unit end rack F6 rack6Meter
Calculation obtains the total ratio convexity variation delta C of mm finishing mill unit*Include:
ΔC*=C6-C0。
Step 4 is discussed in detail.
The ratio convexity distribution coefficient λ that each rack of mm finishing mill unit is calculatednInclude:
Wherein, h described in formulanFor the exit thickness of mm finishing mill unit the n-th rack strip；The wnFor the n-th rack of mm finishing mill unit
The exit width of strip；The α is strip buckle limit coefficient, general value 1.86-2.00 in hot continuous rolling.
Step 5 is discussed in detail.
The basis obtains the ratio convexity distribution coefficient λ of each rack of mm finishing mill unitnIt is each that mm finishing mill unit is calculated
The ratio convexity sendout Δ C of racknInclude:
ΔCn=βn·λn·ΔC*；
Wherein, β described in formulanAdjustment factor, value range 0.8- are distributed for mm finishing mill unit the n-th rack ratio convexity
1.2。
Step 6 is discussed in detail.
The ratio convexity sendout Δ C of each rack of the mm finishing mill unit that the basis obtainsnMm finishing mill unit is calculated
The strip export ratio convexity C of each racknInclude:
Cn=Cn-1+ΔCn；
Wherein, C described in formulanFor the export ratio convexity of mm finishing mill unit the n-th rack strip；The Cn-1For mm finishing mill unit
The export ratio convexity of (n-1)th rack strip；The Δ CnThe ratio convexity sendout of the n-th rack of mm finishing mill unit.
In order to become apparent from the embodiment of the present invention, introduced from the application method of the embodiment of the present invention below.
Referring to fig. 2, the mm finishing mill unit of certain iron and steel enterprise 2250mm hot rolling line is six racks, plat control system
Ratio convexity allocation algorithm precision is poor since operation, influences convexity and flatness control quality.The invention patent is high-strength
Automobile Plate field application is as follows:
Table 1
Patent specific steps calculated result is as shown in table 1 according to the present invention.
| Shelf number | F1 | F2 | F3 | F4 | F5 | F6 |
| Middle wave buckle limit | -0.0192 | -0.0067 | -0.0029 | -0.0017 | -0.0011 | -0.0009 |
| Side wave buckle limit | 0.0385 | 0.0135 | 0.0058 | 0.0033 | 0.0022 | 0.0018 |
| Ratio convexity variable quantity | 0.0034 | 0.0012 | 0.0005 | 0.0003 | 0.0002 | 0.0002 |
Table 2
As shown in table 2, the ratio convexity variable quantity for method each rack calculated that the invention patent provides is located at shape wave
Within the scope of buckle limit, it is not out middle unrestrained buckle limit and side wave buckle limit, it is seen that the invention patent is guaranteeing that target is convex
The outlet shape wave that ensure that each rack under the precondition of degree well realizes the accuracy control of convexity and straightness.
It should be noted last that the above specific embodiment is only used to illustrate the technical scheme of the present invention and not to limit it,
Although being described the invention in detail referring to example, those skilled in the art should understand that, it can be to the present invention
Technical solution be modified or replaced equivalently, without departing from the spirit and scope of the technical solution of the present invention, should all cover
In the scope of the claims of the present invention.
Claims (5)
1. a kind of hot-rolling plate band ratio convexity distribution method, which comprises the following steps:
The entrance ratio convexity C of mm finishing mill unit F1 rack is calculated0；
Obtain the target proportion convexity C of mm finishing mill unit end rack F6 rack6；
According to the entrance ratio convexity C of F1 rack0And the target proportion convexity C of mm finishing mill unit end rack F6 rack6Essence is calculated
The total ratio convexity variation delta C of milling train group*；
The ratio convexity distribution coefficient λ of each rack of mm finishing mill unit is calculatedn；
According to obtaining the ratio convexity distribution coefficient λ of each rack of mm finishing mill unitnThe ratio of each rack of mm finishing mill unit is calculated
Convexity sendout Δ Cn；
According to the ratio convexity sendout Δ C of each rack of obtained mm finishing mill unitnEach rack of mm finishing mill unit is calculated
Strip export ratio convexity Cn；
The entrance ratio convexity C that mm finishing mill unit F1 rack is calculated0Include:
Wherein, h described in formula0For roughing extreme trace time exit thickness；The P0For roll-force；The Cw0For the comprehensive of rough rolling working roll
Close convexity；The Cb0For the synthesis convexity of roughing backing roll；The kh0Coefficient, value range are influenced for supplied materials inlet thickness
0.9-1.1；The kp0For the stiffness coefficient of roughing mill；The kw0Coefficient, value range are influenced for the comprehensive convexity of working roll
0.75-1.25；The kb0Coefficient, value range 0.75-1.25 are influenced for the comprehensive convexity of backing roll.
2. hot-rolling plate band ratio convexity distribution method according to claim 1, which is characterized in that described according to F1 rack
Entrance ratio convexity C0And the target proportion convexity C of mm finishing mill unit end rack F6 rack6The total ratio of mm finishing mill unit is calculated
Convexity variation delta C*Include:
ΔC*=C6-C0。
3. hot-rolling plate band ratio convexity distribution method according to claim 1, which is characterized in that described that essence is calculated
The ratio convexity distribution coefficient λ of each rack of milling train groupnInclude:
Wherein, h described in formulanFor the exit thickness of mm finishing mill unit the n-th rack strip；The wnFor mm finishing mill unit the n-th rack strip
Exit width；The α is strip buckle limit coefficient, value 1.86-2.00 in hot continuous rolling.
4. hot-rolling plate band ratio convexity distribution method according to claim 1, which is characterized in that the basis obtains essence
The ratio convexity distribution coefficient λ of each rack of milling train groupnThe ratio convexity sendout Δ C of each rack of mm finishing mill unit is calculatedn
Include:
ΔCn=βn·λn·ΔC*；
Wherein, β described in formulanAdjustment factor, value range 0.8-1.2 are distributed for mm finishing mill unit the n-th rack ratio convexity.
5. hot-rolling plate band ratio convexity distribution method according to claim 1, which is characterized in that the basis obtained
The ratio convexity sendout Δ C of each rack of mm finishing mill unitnThe strip export ratio of each rack of mm finishing mill unit is calculated
Convexity CnInclude:
Cn=Cn-1+ΔCn；
Wherein, C described in formulanFor the export ratio convexity of mm finishing mill unit the n-th rack strip；The Cn-1For mm finishing mill unit (n-1)th
The export ratio convexity of rack strip；The Δ CnThe ratio convexity sendout of the n-th rack of mm finishing mill unit.
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| CN109513750B (en) * | 2018-11-06 | 2021-07-23 | 首钢集团有限公司 | Convexity feedback method considering waveform adjustment among racks |
| CN111229838B (en) * | 2018-11-28 | 2021-07-09 | 上海梅山钢铁股份有限公司 | Method for solving wave shape between frames through proportional convexity change coefficient |
| CN110976524B (en) * | 2019-10-21 | 2021-05-14 | 德龙钢铁有限公司 | Convexity configuration method for working roll of hot continuous rolling mill |
| CN112122357B (en) * | 2020-08-27 | 2022-06-17 | 德龙钢铁有限公司 | Convexity distribution method for hot continuous rolling finish rolling strip steel |
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| CN103372575B (en) * | 2012-04-17 | 2015-06-24 | 上海梅山钢铁股份有限公司 | Pickling and rolling mill load distribution method |
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| CN104096714B (en) * | 2013-04-11 | 2016-06-29 | 宝山钢铁股份有限公司 | A kind of hot-strip convexity autocontrol method |
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