CN108941208A - A kind of roughing width control method of slab - Google Patents
A kind of roughing width control method of slab Download PDFInfo
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- CN108941208A CN108941208A CN201710374468.0A CN201710374468A CN108941208A CN 108941208 A CN108941208 A CN 108941208A CN 201710374468 A CN201710374468 A CN 201710374468A CN 108941208 A CN108941208 A CN 108941208A
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- 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
- B21B37/22—Lateral spread control; Width control, e.g. by edge rolling
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Abstract
The present invention relates to a kind of roughing width control methods of slab, target is controlled according to roughing width, determine that edger roll needs the passage of fixed drafts and the drafts of the passage as needed first, then since the last rolling pass of edger roll, according to the anti-target width for selecting roller throat width as upper a time or a few passages of drafts, the edger roll load for inversely distributing one or several passages is realized；Edger roll residue passage is finally subjected to forward load distribution；After slab completes each passes, it just will start rolling and calculate again, edger roll drafts is reset according to newest production information.Operative employee's manual intervention can be greatly reduced more effectively using the measured value after slab rolling in the present invention, and significantly improves width control precision, solve existing roughing width control method due to manual intervention, width of plate slab controls the low problem of precision.
Description
Technical field
The present invention relates to hot rolling technique fields, and in particular to a kind of roughing width control method of slab.
Background technique
Hot rolling roughing at present generally uses two rolling mills, such as Fig. 1, and two rolling mills include that E1, E2 two erects roller mill.Roughing
The rule of edge rolling sharing of load be roughing the big edger roll of E1 the first passage by slab rolling to target width, after
The rolling target of each forward direction passage of edger roll maintains R2 exit width, i.e., each forward direction passage of roughing is with R2 export goal width
On the basis of, to throat width per pass, reach R2 export goal by E1, E2 edger roll side pressure, and after the rolling of R1 or R2 level
Width is distribution principle.Another uses the method for roughing load equal proportion surplus weighting, such as the patent No. 201310005629,
Method disclosed in the patent document of entitled " roughing vertical roll rolling load auto-allocation method ", both methods final pass
Width is depressed load and can be fluctuated with the variation of pressure load in distribution.This can generate following two in production and ask
Topic:
(1) when roughing width controls there is certain fluctuation in supplied materials fluctuation, and this fluctuation cannot be predicted.When
When certain slab supplied materials fluctuate larger, it is out of control to often result in roughing exit width.
(2) final pass drafts fluctuates, and causes the unstable of model learning.
In paper " application (Application of of the complex thermal conductivity coefficient in Stand Mill roughing sharing of load
Equal Load Function to Load Distribution on Double-Stand Mill During Hot
Strip Rough Rolling) " in, the characteristics of disclosing for hot strip rolling Stand Mill roughing mills, using comprehensive etc. negative
Lotus function method carries out sharing of load, and when distribution takes into account the influence of plain-barreled roll and edge rolling, carries out in width and thickness both direction
Etc. the alternating iterations of function of load calculate, successive optimization regulation, and be provided with unit rolling load in external iteration and transfinite feelings
Road number under condition is corrected automatically.
It is open based on strip heat in paper " the deposit Load Method such as multiplexing is in the application in rougher of hot strip mill sharing of load "
The characteristics of tandem rolling roughing area, proposes the deposit Load Method such as multiplexing.This method equally uses Multilevel Iteration algorithm to carry out roughing mill
Group sharing of load, outer layer carry out total rolling pass to be incremented by iteration, and internal layer determines that steel strip thickness and width are rolled by alternating iteration
The synthetic load functional value in direction processed, successive optimization plain-barreled roll and edger roll regulation.
Method in above two papers is concentrated mainly on the sharing of load of horizontal roller.Edger roll sharing of load is used etc.
The targets rolling mode such as exit width first sets each forward direction passage exit width target, then calculates width drafts；Or text
In simply mention once, can not know for sure its accurate method.
In addition, a patent of applicant's authorization, the patent No. 201310005629, entitled " roughing vertical roll rolling load
Auto-allocation method ", it is main by calculating width overall reduction, each outlet unequal width mesh is determined according to edger roll sharing of load
Mark considers finally to determine edger roll load distribution method after dog bone spreads.
Existing roughing width control is generally distributed using forward load, and is weighted according to different product specification and carried out load
Adjustment, heavy workload, control effect is also unobvious, and model generally carries out presetting calculating, subsequent dependence in width control process
Operative employee's dynamic adjusts, and it is low that width controls precision.
Summary of the invention
The object of the present invention is to provide a kind of roughing width control method of slab, this method is based on roughing vertical roll load
Operative employee's manual intervention can be greatly reduced more effectively using the measured value after slab rolling in the control method inversely distributed,
And significantly improve width control precision.To solve existing roughing width control method due to manual intervention, width of plate slab control
The low problem of precision processed.
To achieve the above object, the scheme of the invention is: a kind of roughing width control method of slab, the roughing are wide
Spending control method is the control method inversely distributed based on roughing vertical roll load, controls target, first basis according to roughing width
It needs to be determined that edger roll needs the passage of fixed drafts and the drafts of the passage, then opened from the last rolling pass of edger roll
Begin, according to the anti-target width for selecting roller throat width as upper a time or a few passages of drafts, realizes reverse distribution one
Or the edger roll load of several passages；Edger roll residue passage is finally subjected to forward load distribution；Every a time is completed when slab to roll
After system, it just will start rolling and calculate again, edger roll drafts is reset according to newest production information；
Detailed process is as follows for the width control method:
(1) target width of setting roughing outlet；
(2) determine that edger roll needs the passage of fixed drafts and the drafts of the passage；
(3) since the last rolling pass of edger roll, according to edger roll drafts, this passage exit width, horizontal passage pressure
Lower amount calls dog bone width-spread model and natural width spread model, establishes the nonlinear equation of edger roll throat width, pass through newton flat-sawn
Method iteration acquires edger roll throat width, and using the edger roll throat width as the target width of upper a time or a few passages；
(4) after completing the reverse passage sharing of load of edger roll in step (3), the distribution of edger roll forward load is called, it will be remaining
Load forward direction is assigned to edger roll residue passage, obtains edger roll with reference to drafts and each forward direction passage export goal width；
(5) according to the export goal width of each forward direction passage, determine that last roughing is horizontal by the way of forward recursive
Roller, edger roll drafts preset value, and passes are carried out to slab according to the preset value；
(6) after the rolling for completing a passage, slab developed width is measured, and wide according to determining forward direction passage target
Degree, starting roughing are reset, and set edger roll drafts again by the way of forward recursive, and start the rolling of lower a time,
Until completing entire rough rolling process.
Further, roughing width control method according to the present invention, in the step (2), if fixed pressure
The passage of amount is roughing vertical roll final pass, half of the fixed drafts by way of time maximum reduction.
Further, roughing width control method according to the present invention, in the step (3), edger roll enters mouth width
The nonlinear equation of degree are as follows:
F (x)=x-dw+f (We,h0,h1,T)+f(We,Wf,h0,R)-WTarget
Wherein, x is edger roll throat width；
WeFor rolled piece width after side pressure；
h0,h1Before respectively horizontal rolling, after rolling strip thickness；
Dw is edger roll lateral pressure amount；
WfFor strip width after flat-rolled；
T is board briquette；
R is horizontal roll radius；
WTargetFor edger roll export goal width.
Further, roughing width control method according to the present invention, in the step (4), if positive distribution
Edger roll passage whole load ultralimit, or the edger roll passage whole load of positive distribution is 0, then to edger roll is inversely completed
The passage of pressure carries out whole positive distribution, to ensure final width target.
It is that the present invention reaches the utility model has the advantages that the control ability of edger roll final pass can be improved in method of the invention, stablize
The width model of roughing final pass learns, and operative employee can be greatly reduced more effectively using the measured value after slab rolling
Manual intervention, and significantly improve width control precision.Method of the invention is applied to Baosteel Zhanjiang 2250,1580 hot rolling of Golconda produces
It is obvious for improving width control precision effect after line.
Detailed description of the invention
Fig. 1 is hot rolling width control system schematic diagram；
Fig. 2 is control method flow chart of the invention；
Fig. 3 is the main component schematic diagram spreaded；
Fig. 4 is the cross-sectional outling schematic diagram of slab after (dotted line), side pressure before side pressure；
Fig. 5 a is the edger roll sharing of load that conventional method obtains in embodiment one；
Fig. 5 b is embodiment one kind, the edger roll sharing of load that the method for the present invention obtains；
Fig. 6 a is the edger roll sharing of load that conventional method obtains in embodiment two；
Fig. 6 b is the edger roll sharing of load that the method for the present invention obtains in embodiment two.
Specific embodiment
The present invention is described in further detail with specific embodiment with reference to the accompanying drawing.
The setting of general hot rolling roughing vertical roll depends primarily on computing function again that is presetting, and ignoring width.The present invention
Computing capability, key are that current width sharing of load all uses the positive method of salary distribution to exploitation width again to greatest extent, i.e., respectively
Edger roll width drafts is allocated using mode from front to back in substantially stationary ratio.The innovation of control method of the present invention
When place is the control of roughing width, target is controlled according to roughing width, determines that edger roll needs fixed pressure as needed first
The passage and drafts of amount, then since last edge rolling passage, according to the anti-roller throat width of selecting of drafts as upper
The target width of a time or a few passages；Then remaining passage is subjected to forward load distribution.Every a time is completed when slab to roll
System, just will start rolling and calculates again, reset edger roll drafts according to newest production information.
As shown in Fig. 2, detailed process is as follows for control method of the present invention:
1, roughing width target and horizontal roller load setting calculate
The width control target of hot rolling refers generally to finish rolling width, but the main operation of rolling of width is completed in roughing.Strip
Width can spread and drawing down phenomenon in the finish rolling operation of rolling.Therefore roughing rolling setting first has in finish rolling width target
On the basis of determine roughing exit width target.The target width of roughing outlet considers width surplus, the essence of different steel grades, specification
Roll the global hereditary equivalent of natural width predicted value, made Target width correction amount, width.
Roughing horizontal roller load setting is calculated as general-purpose computations, is basically completed before edger roll setting.
2, it determines the fixed pressure passage of edger roll and drafts: being read from technique table, configuration file or operation screen.For allusion quotation
Type hot rolling line, roughing only export one width gage of configuration in R2, and typical strip is produced using 3+3 passage.In this case,
Specified roughing vertical roll final pass is fixed drafts, half of the drafts by way of time maximum reduction.
3, edger roll load inversely distributes calculating: since last edger roll passage, going out mouth width according to edger roll drafts, this passage
Degree, horizontal reduction in pass etc., and dog bone width-spread model, natural width spread model are called, establish the non-linear of edger roll throat width
Equation acquires throat width by newton Chord iterative method.
4, the distribution of edger roll load forward direction calculates: after completing the reverse passage sharing of load of edger roll, calling edger roll forward load point
Match, obtains edger roll with reference to drafts and each forward direction passage exit width target.
Here need to handle there are two types of abnormal conditions: one is the edger roll passage whole load ultralimit of forward direction distribution, separately
Edger roll passage whole load one is forward direction distribution is 0.At this moment it needs to carry out the passage that edger roll pressure is inversely completed complete
The positive distribution in portion, to ensure final width target.
5, the last forward recursive of roughing setting up calculates: after the completion of edger roll sharing of load, will determine each forward direction road of roughing width
Secondary exit width target and refer to drafts.According to the exit width target of each forward direction passage of roughing width, roughing is presetting
Process determines last roughing horizontal roller, edger roll pressure setting by the way of forward recursive.
6, roughing is presetting to be rolled and calculate data collection again: roughing setting up value issues, and L1 completes setting rolling, and collection is rolled
Data processed upload to L2.
7, roughing resets calculating: roughing is completed will be from new starting setting program, according to what is newly obtained after rolling per pass
Rolling line real measured data sets edger roll pressure simultaneously according to determining forward direction passage width target again by the way of forward recursive
L1 is set to execute.
Roughing calculates again to be started after the completion of rolling per pass, and the variation for generally calculating setting again is little, but final pass
Edger roll reset calculating and can change greatly.This is because the general outlet hot rolling producing line roughing R2 dress width gage table, therefore thick
Roll R1 milling train carry out calculate again setting edger roll pressure it is little with precomputation difference.It is past when R2 completes the first passes
Toward strip width can be measured, at this moment if the width measured is larger with setting target difference, the subsequent road of calculating is reset
It is secondary to change greatly.The method of this patent inversely determines final pass edger roll drafts in peak load when initial load distributes
Median, then be that last edger roll passage width adjusting provides and preferably calculates setting condition again.
Dog bone and natural width spread model of the invention is following (as shown in Figures 3 and 4):
After side pressure when flat-rolled, strip width W after flat-rolledfAre as follows:
Wf=We+dWs+dWb
In formula: WeFor rolled piece width after side pressure；
dWs=f (We,h0,h1, T) and it is spreaded for the rolled piece after horizontal rolling in addition to cydariform returns exhibition, i.e., level is spreaded, h0,h1Point
It Wei not the horizontal thickness for rolling forward and backward strip；T is board briquette.
dWb=f (Wo,We,h0, R) and it returns and opens up for the cydariform after horizontal rolling, i.e., " dog bone " spreads；W0For width before side pressure, We
For rolled piece width after side pressure, R is horizontal roll radius.
The process of retrospectively calculate edger roll throat width of the present invention is as follows:
Roughing vertical roll determines reduction in pass, in given level rolling load condition and horizontal mill export goal width
Deng under the conditions of, after considering that E1 or E2 dog bone spreads and R1, R2 level spreads, nonlinear equation is as follows:
Wf=We+dWs+dWb
=W0-dw+f(We,h0,h1,T)+f(We,Wf,h0,R)
In formula: dw is edger roll lateral pressure amount；
Enable x=W0For slab throat width, then nonlinear equation are as follows:
F (x)=x-dw+f (We,h0,h1,T)+f(We,Wf,h0,R)-WTarget
WTargetFor edger roll export goal width.
Throat width W is acquired by newton Chord iterative method0, newton Secant Method is the known normal of those skilled in the art
Know, repeats no more herein.
Two application examples of control method of the present invention are described below:
Example one: (subtracting wide situation greatly)
Strip throat width: 1325mm；
Strip Roughing target width: 1275.639mm；
Using 3-3 passes；
R1 horizontal roller roll reduction (mm): 45.78748,36.67128,32.39326
R2 horizontal roller roll reduction (mm): 32.97459,22.20248,15.59376
E1 roller diameter: 935.0mm；
E2 roller diameter: 1010.0mm；
Roughing inlet temperature: 1011.73 DEG C；
Roughing E1 depresses the limit: the 1st passage of E1: 80, E1 the 2nd passages: 70
Roughing E2 depresses the limit: the 1st passage of E2: 60, E2 the 2nd passages: 30
Supplied materials thickness: 230mm
R1 roller diameter: 1300.0mm
R2 roller diameter: 1230.0mm
The edger roll sharing of load (unit: mm) that 1 conventional method of table obtains
| E1-1 | E2-1 | E2-3 | E2-5 | |
| Forward direction passage target width | 1290.29 | 1284.568 | 1278.18 | 1275.639 |
| Edger roll drafts | 73.525 | 62.051 | 41.603 | 25.338 |
The edger roll sharing of load (unit: mm) that 2 the method for the present invention of table obtains
| E1-1 | E2-1 | E2-3 | E2-5 | |
| Forward direction passage target width | 1289.78 | 1280.02 | 1275.78 | 1275.639 |
| Edger roll drafts | 75.165 | 63.981 | 45.103 | 15.102 |
Assuming that supplied materials deviation -10.0 (or 10.0), has been rolled down to the first passage of the first passage of E2 and R2 in roughing, formed -
5.0 (or 10.0) deviations.Such as Fig. 5 a, conventionally, after R2 surveying the wide width of plate slab that measures for the first time is about 1273.18
(or 1283.18).Consider that the most subsequent twice of R2 time form natural width spread about 5 or so, and if edger roll final pass depresses efficiency
About 30%, edger roll is according to emptying rolling (or 30 pressures at full capacity)；Then the thick mouth width degree of last roughing be 1270.78 (or
1780.78) left and right forms+- 3 with the upper deviation.
Such as Fig. 5 b, the method according to the invention, survey after R2 it is wide measure practical width of plate slab be 1270.18 (or
1280.18), if edger roll final pass pressure efficiency is 30%, edger roll is according to emptying rolling (or 30 pressures at full capacity)；Then most
The thick mouth of roughing reaches target afterwards, and error is within 1.0.
Example two: (small to subtract wide situation)
Strip throat width: 1325mm；
Strip Roughing target width: 1315.6mm；
Using 3-3 passes；
R1 horizontal roller roll reduction (mm): 45.78748,36.67128,32.39326
R2 horizontal roller roll reduction (mm): 32.97459,22.20248,15.59376
E1 roller diameter: 935.0mm；
E2 roller diameter: 1010.0mm；
Roughing inlet temperature: 1011.73 DEG C；
Roughing E1 depresses the limit: the 1st passage of E1: 80, E1 the 2nd passages: 70
Roughing E2 depresses the limit: the 1st passage of E2: 60, E2 the 2nd passages: 30
Supplied materials thickness: 230mm
R1 roller diameter: 1300.0mm
R2 roller diameter: 1230.0mm
The edger roll sharing of load (unit: mm) that 3 conventional method of table obtains
| E1-1 | E2-1 | E2-3 | E2-5 | |
| Forward direction passage target width | 1320.29 | 1315.56 | 1312.88 | 1315.6 |
| Edger roll drafts | 28.16 | 20.679 | 12.761 | 6.208 |
The edger roll sharing of load (unit: mm) that 4 the method for the present invention of table obtains
| E1-1 | E2-1 | E2-3 | E2-5 | |
| Forward direction passage target width | 1321.29 | 1317.89 | 1315.67 | 1315.6 |
| Edger roll drafts | 25.226 | 18.981 | 11.103 | 15.102 |
Assuming that supplied materials deviation -10.0 (or 10.0), has been rolled down to the first passage of the first passage of E2 and R2 in roughing, formed -
5.0 (or 10.0) deviations.Such as Fig. 6 a, conventionally, after R2 surveying the wide width of plate slab that measures for the first time is about 1307.88
(or 1317.88).Consider that the most subsequent twice of R2 time form natural width spread about 5 or so, and if edger roll edger roll final pass is depressed
Efficiency is about 30%, and edger roll is according to emptying rolling (or 30 pressures at full capacity)；Then the thick mouth width degree of last roughing be 1312.6 (or
1318.6) left and right forms+- 3 with the upper deviation.
Such as Fig. 6 b, the method according to the invention, survey after R2 it is wide measure practical width of plate slab be 1310.67 (or
1320.67), if edger roll final pass pressure efficiency is 30%, edger roll is according to emptying rolling (or 30 pressures at full capacity)；Then most
The thick mouth of roughing reaches target afterwards, and error is within 1.0.
The present invention is the width control method inversely distributed based on roughing vertical roll load, and this method is negative in progress roughing vertical roll
When lotus is distributed, the drafts of last edger roll passage is fixed first, inversely distributes the edger roll load of one or several passages；Then again
Remaining load is assigned to edger roll residue passage according to conventional forward sequence.It, can be with after the slab completes several passes
Measurement obtains slab developed width, resets calculating according to actual measurement width starting roughing and depresses from new settings edger roll.This method can
More effectively to utilize the measured value after slab rolling, operative employee's manual intervention is greatly reduced, and significantly improves width control essence
Degree.
Claims (4)
1. a kind of roughing width control method of slab, it is characterised in that: the roughing width control method is based on roughing
The control method that edger roll load inversely distributes controls target according to roughing width, determines that edger roll needs to fix as needed first
The drafts of the passage of drafts and the passage is selected then since the last rolling pass of edger roll according to drafts is counter
Target width of the roller throat width as upper a time or a few passages realizes that the edger roll for inversely distributing one or several passages is negative
Lotus；Edger roll residue passage is finally subjected to forward load distribution；After slab completes each passes, rolling just will start again
It calculates, edger roll drafts is reset according to newest production information；
Detailed process is as follows for the width control method:
(1) target width of setting roughing outlet；
(2) determine that edger roll needs the passage of fixed drafts and the drafts of the passage；
(3) since the last rolling pass of edger roll, according to edger roll drafts, this passage exit width, horizontal reduction in pass,
Dog bone width-spread model and natural width spread model are called, the nonlinear equation of edger roll throat width is established, is changed by newton Secant Method
In generation, acquires edger roll throat width, and using the edger roll throat width as the target width of upper a time or a few passages；
(4) after completing the reverse passage sharing of load of edger roll in step (3), the distribution of edger roll forward load is called, by remaining load
Forward direction is assigned to edger roll residue passage, obtains edger roll with reference to drafts and each forward direction passage export goal width；
(5) according to the export goal width of each forward direction passage, roughing vertical roll drafts is carried out by the way of forward recursive pre-
Setting, and roughing passes are carried out to slab according to preset drafts；
(6) after the rolling for completing a passage, slab developed width is measured, and according to determining forward direction passage target width,
Starting roughing is reset, and sets edger roll drafts again by the way of forward recursive, and start the rolling of lower a time, until
Complete entire rough rolling process.
2. roughing width control method according to claim 1, which is characterized in that in the step (2), if fixed pressure
The passage of lower amount is roughing vertical roll final pass, half of the fixed drafts by way of time maximum reduction.
3. roughing width control method according to claim 1, which is characterized in that in the step (3), edger roll entrance
The nonlinear equation of width are as follows:
F (x)=x-dw+f (We,h0,h1,T)+f(We,Wf,h0,R)-WTarget
Wherein, x is edger roll throat width；
WeFor rolled piece width after side pressure；
h0,h1Before respectively horizontal rolling, after rolling strip thickness；
Dw is edger roll lateral pressure amount；
WfFor strip width after flat-rolled；
T is board briquette；
R is horizontal roll radius；
WTargetFor edger roll export goal width.
4. roughing width control method according to claim 1, which is characterized in that in the step (4), if positive point
The edger roll passage whole load ultralimit matched, or the edger roll passage whole load of positive distribution is 0, then it is vertical to being inversely completed
Passage under roll-in carries out whole positive distribution, to ensure final width target.
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| CN111036690A (en) * | 2019-11-14 | 2020-04-21 | 北京科技大学设计研究院有限公司 | Method for controlling deflection of rough rolling intermediate billet |
| CN112439791A (en) * | 2019-08-29 | 2021-03-05 | 宝山钢铁股份有限公司 | Thickness control method in finish rolling threading process |
| CN112916614A (en) * | 2021-01-13 | 2021-06-08 | 江阴兴澄特种钢铁有限公司 | Flat rolling method for 7-8mm steel plate with limited length |
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| CN111036690A (en) * | 2019-11-14 | 2020-04-21 | 北京科技大学设计研究院有限公司 | Method for controlling deflection of rough rolling intermediate billet |
| CN112916614A (en) * | 2021-01-13 | 2021-06-08 | 江阴兴澄特种钢铁有限公司 | Flat rolling method for 7-8mm steel plate with limited length |
| CN112916614B (en) * | 2021-01-13 | 2022-07-22 | 江阴兴澄特种钢铁有限公司 | Flat rolling method for 7-8mm steel plate with limited length |
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