CN105268748B - Productized hot rolling load distribution method - Google Patents

Productized hot rolling load distribution method Download PDF

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CN105268748B
CN105268748B CN201410338147.1A CN201410338147A CN105268748B CN 105268748 B CN105268748 B CN 105268748B CN 201410338147 A CN201410338147 A CN 201410338147A CN 105268748 B CN105268748 B CN 105268748B
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load
rack
steel
formula
model
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CN105268748A (en
Inventor
张永雪
贾银芳
谭耘宇
汤红生
郑向东
曹德亮
张涛
王宏学
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Shanghai Meishan Iron and Steel Co Ltd
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Shanghai Meishan Iron and Steel Co Ltd
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Abstract

The present invention provides a kind of productized hot rolling load distribution method.This method comprises the following steps:Incoming hot rolled slab is divided into two major class of cold rolling material and variety steel, cold rolling material uses reduction ratio laod sharing mode, and variety steel uses roll-force laod sharing mode;Increase by two kinds of load distribution mode automatic switching functions in the controls.The present invention is directed to the characteristics of hot-rolled product, the laod sharing mode being combined according to the purposes of product in mm finishing mill unit using roll-force and reduction ratio, under the premise of ensuring that production is stablized, the phenomenon that reducing intervention frequency and amplitude of the operative employee to mill load, reduce finish rolling leading portion rack skidding steel scrap.

Description

Productized hot rolling load distribution method
Technical field:
The present invention relates to a kind of productized hot rolling load distribution methods.
Background technology:
It is introduced when existing hot rolling 1422mm models are finish rolling technological transformation in 2002 from U.S. GE, former GE finish rolling model is only adopted With roll-force laod sharing mode, although there are reduction ratio laod sharing mode in program, due to the product phase of initial stage debugging To less, all products are all produced using roll-force mode, and the reduction ratio method of salary distribution was not just debugged, and are existed very in program More BUG.As cold mill complex is reached the standard grade, the cold-rolled products of rolling are more and more, when cold rolling material is in use roll-force mode of manufacture, The opposite reduction ratio of each rack can be with field condition (such as roll diameter of roller, entry temperature at finishing, pressure-measuring head accuracy of detection) Change and vary widely, operative employee needs often to intervene load as needed, so as to cause the unstable and operator of production Member increases the amplitude and frequency of each rack sharing of load intervention, and rack can be caused to sting steel when serious and skidded and steel scrap.
Invention content
The purpose of the present invention is providing a kind of productized hot rolling load distribution method in view of the above problems, The characteristics of for hot-rolled product, the sharing of load being combined according to the purposes of product in mm finishing mill unit using roll-force and reduction ratio Mode under the premise of ensuring that production is stablized, reduces intervention frequency and amplitude of the operative employee to mill load, reduces finish rolling leading portion The phenomenon that rack skidding steel scrap.
Above-mentioned purpose is achieved through the following technical solutions:
Productized hot rolling load distribution method, this method comprises the following steps:Incoming hot rolled slab is divided into cold rolling material With two major class of variety steel, cold rolling material uses reduction ratio laod sharing mode, and variety steel uses roll-force laod sharing mode;It is controlling Increase by two kinds of load distribution mode automatic switching functions in system processed.
The productized hot rolling load distribution method, the reduction ratio laod sharing mode include following step Suddenly:
(1) sharing of load initial setting:According to the corresponding load design specification of product specification each in model database and behaviour Intervention of the workmanship on load picture measures out the initial load distribution load of each rack model specificationinit0(i) divide with total load With loadtot, wherein i be 1~N, N for rack sum, and by first rack and end rack intervention range be placed on ± 150% between, Other racks are between ± 120%;
(2) sharing of load standardizes:Load is distributed with initial loadinit0(i) on the basis of maximum value, each rack is born Lotus distribution is standardized, and calculation formula is as follows:
(3) the setting initial calculation of each rack drafts:When first time carrying out THICKNESS CALCULATION, using the result of step 2 The drafts of each rack of finish rolling is calculated with roughing target thickness, finish rolling target thickness, it is assumed that finish rolling at present shares n rack, and i is Shelf number,
In formula:loadinit(i) it is each rack load of model initial setting,
h0For roughing target thickness,
hnFor finish rolling target thickness,
Draft (i) is the i-th rack outlet belt steel thickness;
(4) each rack load is recalculated using alternative manner, until meeting technological requirement:According to field working conditions and product Technological design the limit range of reduction ratio is set in a model, and thus obtains drafts range and limited rack, if by The reduction ratio for limiting rack exceeds allowed band, then calculates the ratio that each rack exceeds according to formula 4, and calculates new load point Match, and this rack and other rack loads adjusted according to formula 5 and formula 6 respectively,
Md_fac (i)=lim_rat_dft (i) -1 (formula 4),
In formula:The sharing of load coefficient of rack when lim_rat_dft is limited,
Md_fac is the sharing of load that rack needs adjust,
Ndmy_num crosses rack number for non-empty,
According to the load load after adjustmentfinal(i) load is replacedinit(i), it is iterated to calculate again according to step 2 and step 3 Each passage load and drafts, until institute's organic frame correlation model setting all meets production requirement;
(5) self study of the reduction ratio method of salary distribution:When load adjustment amount with adjustment before load proportion when within 10%, Model parameter is stored in database, is calculated for next model specification,
loaddb_adapt(i)=loaddb(i)+(loadfinal(i)-loaddb(i)) * df_cf (formula 7)
In formula:loaddb_adaptFor each rack load coefficient that be saved in after self study in database,
loaddbFor the load coefficient of each rack is configured in model database,
loadfinalFor the load coefficient of each rack that model finally calculates,
Df_cf is self study coefficient, and 0.1 is set as in model.
The productized hot rolling load distribution method, the cold rolling material include straight carbon steel SPHC series, plating Sheet tin series, IF steel series and acid-cleaning plate, the variety steel include cylinder steel, boxboard, pipe line steel.
Description of the drawings
Fig. 1:The program flow diagram of the present invention.
Specific embodiment
Productized hot rolling load distribution method, this method comprises the following steps:
First, determine which kind of laod sharing mode product uses:
The product of hot rolling 1422mm producing lines is divided into two major class of cold rolling material and variety steel at present.Cold rolling material includes straight carbon steel SPHC Series, tin plate series, IF steel series and acid-cleaning plate, variety steel include cylinder steel, boxboard, pipe line steel etc..Due to cold rolling material Tensile strength is generally relatively low, substantially in 400MP hereinafter, ductility is good, can further be produced in cold rolling process, and cold rolling will Ask the thick difference of incoming hot rolled slab small as possible, so using reduction ratio laod sharing mode in hot fine rolling according to rolling feature;Variety steel Tensile strength is higher, generally in more than 400MP, has the performances such as high rigidity, high-wearing feature and high tenacity, base after hot rolled rolling This is taken out as finished product, is not too high to thick difference requirement, so using roll-force laod sharing mode.
2nd, two kinds of load distribution mode automatic switching function exploitations of roll-force and reduction ratio:
Increase in model steel grade table and whether represented using reduction ratio mode identification field, 0 using roll-force mode, 1 generation Table uses reduction ratio mode.
3rd, the Controlling model exploitation and optimization of reduction ratio rolling mode:
Although there are reduction ratio laod sharing mode in hot rolling 1422mm model programs, due to the product phase of initial stage debugging To less, all products are all produced using roll-force mode, and the reduction ratio method of salary distribution was not just debugged, and are existed very in program More BUG.The relevant number of rolling model under reduction ratio mode is developed and optimized again on the basis of original model for the situation According to structure and control logic, particular content is as follows:
Step 1:Sharing of load initial setting:
Sharing of load coefficient is one of the production stability of producing line and the influence factor of control of product precision, therefore is being configured During the sharing of load coefficient of the reduction ratio method of salary distribution of each product specification, need to use for reference a large amount of historical data, in historical data On the basis of carry out the rolling schedule model measuring and calculating of the reduction ratio method of salary distribution, and according to each rack roll-force of measuring and calculating, opposite pressure Situations such as lower rate and power of motor, optimizes the other sharing of load coefficient of each layer, and suitable sharing of load coefficient finally is stored in mould Type database.
It is dry on load picture according to the corresponding load design specification of product specification each in model database and operative employee The pre- initial load distribution load for measuring out each rack model specificationinit0(i) (i is 1~N, and N is rack sum) and total load point With loadtot, and between the intervention range of first rack and last rack is placed on ± 150%, other racks are between ± 120%.
Step 2:Sharing of load standardizes:
Load is distributed with initial loadinit(i) on the basis of maximum value, the sharing of load of each rack is standardized, Calculation formula is as follows:
Step 3:The setting initial calculation of each rack drafts:
When first time carrying out THICKNESS CALCULATION, calculated using the result and roughing target thickness of step 2, finish rolling target thickness The drafts of each rack of finish rolling, it is assumed that finish rolling at present shares n rack, and i is shelf number.
In formula:loadinit(i) it is each rack load of model initial setting,
h0For roughing target thickness,
hnFor finish rolling target thickness,
Draft (i) is the i-th rack outlet belt steel thickness,
Step 4:Each rack load is recalculated using alternative manner, until meeting technological requirement.
The limit range of reduction ratio according to the technological design of field working conditions and product is set in a model, and thus obtains pressure Lower amount range and limited rack, if the reduction ratio of limited rack exceeds allowed band, then calculate each rack according to formula 4 and surpass The ratio gone out, and new sharing of load is calculated, and this rack and other rack loads are adjusted according to formula 5 and formula 6 respectively.
Md_fac (i)=lim_rat_dft (i) -1 (formula 4),
In formula:The sharing of load coefficient of rack when lim_rat_dft is limited,
Md_fac is the sharing of load that rack needs adjust,
Ndmy_num crosses rack number for non-empty,
According to the load load after adjustmentfinal(i) load is replacedinit(i), it is iterated to calculate again according to step 2 and step 3 Each passage load and drafts, until institute's organic frame correlation model setting all meets production requirement.
Step 5:The self study of the reduction ratio method of salary distribution:
The load coefficient load being configured in the databasedbIt has used for reference a large amount of historical data to be calculated, substantially all Current hot rolling production can be met, in order to further enhance hot-rolled product quality, need that model is continuously improved by self-learning method Setting accuracy, the self study condition in this method are:Load proportion before load adjustment amount and adjustment, will when within 10% Model parameter is stored in database, is calculated for next model specification.
loaddb_adapt(i)=loaddb(i)+(loadfinal(i)-loaddb(i)) * df_cf (formula 7)
In formula:loaddb_adaptFor each rack load coefficient that be saved in after self study in database
loaddbFor the load coefficient of each rack is configured in model database
loadfinalThe load coefficient of each rack finally calculated for model
Df_cf is self study coefficient, and 0.1 is set as in model.
Concrete application example:
By taking plum steel hot rolling 1422mm productions as an example, the milling train of other same types can also be applied to.
1 plum steel hot rolling 1422mm steel grade grade classification tables of table:
Steel grade kind family number Purposes Hardness group Mpa Main steel grade
1 General structure steel 340-400 Q235B, SS400, SAPH310 etc.
2 Automobile structural steel 450-500 B510L, QSTE340TM etc.
3 Cold rolling material 270-350 SPHC, SPHD, SAR1006 etc.
4 Pipe line steel 500-600 J55, X60, X65 etc.
5 Diamond plate 270-450 H-Q195, H-Q235B etc.
6 Weather resisting steel 440-480 09CuPCrNi-A, SPA-H, B480GNQR etc.
7 Tinning substrate 340-370 MR-2, MR-3 etc.
8 Ultra-low-carbon steel 270 SPHE、IF、SAE1002
9 Cylinder steel 400-450 HP295、SG255
10 Ferrite 270-300 IF steel
11 N80 series More than 600 N80-1
12 Carbon aluminium-killed steel 270-300 AK steel, IF steel
2 plum steel hot rolling 1422mm width grade classification tables of table:
Grade Width range (mm)
0 0 < width≤1100
1 1100 < width≤1350
2 1350 < width
3 plum steel hot rolling 1422mm level of thickness of table divides table:
4 plum steel hot rolling 1422mm roll-force sharing of loads coefficient of table (by taking steel grade race 9 (cylinder steel) as an example):
By taking trade mark SPHC as an example, the finishing stand setup calculation process using reduction ratio laod sharing mode is briefly described.Specification: Exit thickness is 2.75mm, and width is illustrated for 1010mm, and it is as follows to calculate step:
The first step, according to strip steel grade trade mark SPHC, inquiry table 1, it is 3 to acquire steel grade grade;
Second step, according to the exit width 1010mm of strip, inquiry table 2, it is 1 to acquire width grade;
Third walks, and according to the exit thickness 2.75mm of strip, inquiry table 3, it is 6 to acquire level of thickness;
4th step acquires width grade, level of thickness according to front, by inquiry, learns specification finish rolling in rolling The reduction ratio sharing of load coefficient of F0-F6 racks is respectively 1.0,0.55,0.31,0.16,0.08,0.05,0.02;
5th step realizes that finishing stand setup calculates according to the result of step 4, finally calculates exit thickness, the speed of each rack Degree, roll-force etc..
Equally, it by taking trade mark HP295 as an example, is briefly described and stream is calculated using the finishing stand setup of roll-force laod sharing mode Journey.Specification:Exit thickness is 2.5mm, and width is illustrated for 1250mm, and it is as follows to calculate step:
The first step, according to strip steel grade trade mark HP295, inquiry table 1, it is 9 to acquire steel grade grade;
Second step, according to the exit width 1250mm of strip, inquiry table 2, it is 2 to acquire width grade;
Third walks, and according to the exit thickness 2.5mm of strip, inquiry table 3, it is 4 to acquire level of thickness;
4th step acquires width grade, level of thickness according to front, by inquiry, learns specification finish rolling in rolling The reduction ratio sharing of load coefficient of F0-F6 racks is respectively 1.0,0.74,0.69,0.60,0.55,0.46,0.36;
5th step realizes that finishing stand setup calculates according to the result of step 4, finally calculates exit thickness, the speed of each rack Degree, roll-force etc..
The above is only highly preferred embodiment of the present invention, the method for the present invention includes but be not limited to the above embodiments disclosed Technical solution, unaccomplished matter of the invention belong to the common knowledge of those skilled in the art.

Claims (2)

1. a kind of productized hot rolling load distribution method, it is characterized in that:This method comprises the following steps:By incoming hot rolled slab It is divided into two major class of cold rolling material and variety steel, cold rolling material uses reduction ratio laod sharing mode, and variety steel is using rolling power load point With mode;Increase by two kinds of load distribution mode automatic switching functions in the controls;
The reduction ratio laod sharing mode includes the following steps:
(1) sharing of load initial setting:According to the corresponding load design specification of product specification each in model database and operative employee Intervention on load picture measures out the initial load distribution load of each rack model specificationinit0(i) it is distributed with total load loadtot, wherein i be 1~N, N for rack sum, and by first rack and end rack intervention range be placed on ± 150% between, His rack is between ± 120%;
(2) sharing of load standardizes:Load is distributed with initial loadinit0(i) on the basis of maximum value, to the load point of each rack With being standardized, calculation formula is as follows:
(3) the setting initial calculation of each rack drafts:When first time carrying out THICKNESS CALCULATION, using the result of step 2 and thick Roll target thickness, finish rolling target thickness calculates the drafts of each rack of finish rolling, it is assumed that finish rolling at present shares n rack, and i is rack Number,
In formula:loadinit(i) it is each rack load of model initial setting,
h0For roughing target thickness,
hnFor finish rolling target thickness,
Draft (i) is the i-th rack outlet belt steel thickness;
(4) each rack load is recalculated using alternative manner, until meeting technological requirement:According to field working conditions and the work of product Skill design sets the limit range of reduction ratio in a model, and thus obtains drafts range and limited rack, if limited machine The reduction ratio of frame exceeds allowed band, then the ratio that each rack exceeds is calculated, and calculate new sharing of load according to formula 4, And this rack and other rack loads are adjusted according to formula 5 and formula 6 respectively,
Md_fac (i)=lim_rat_dft (i) -1 (formula 4),
In formula:The sharing of load coefficient of rack when lim_rat_dft is limited,
Md_fac is the sharing of load that rack needs adjust,
Ndmy_num crosses rack number for non-empty,
According to the load load after adjustmentfinal(i) load is replacedinit(i), each road is iterated to calculate again according to step 2 and step 3 Secondary load and drafts, until institute's organic frame correlation model setting all meets production requirement;
(5) self study of the reduction ratio method of salary distribution:Load proportion before load adjustment amount and adjustment is when within 10%, by mould Shape parameter is stored in database, is calculated for next model specification,
loaddb_adapt(i)=loaddb(i)+(loadfinal(i)-loaddb(i)) * df_cf (formula 7)
In formula:loaddb_adaptFor each rack load coefficient that be saved in after self study in database,
loaddbFor the load coefficient of each rack is configured in model database,
loadfinalFor the load coefficient of each rack that model finally calculates,
Df_cf is self study coefficient, and 0.1 is set as in model.
2. productized hot rolling load distribution method according to claim 1, it is characterized in that:The cold rolling material packet It includes straight carbon steel SPHC series, tin plate series, IF steel series and acid-cleaning plate, the variety steel and includes cylinder steel, boxboard, pipeline Steel.
CN201410338147.1A 2014-07-16 2014-07-16 Productized hot rolling load distribution method Active CN105268748B (en)

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CN106311762B (en) * 2016-08-26 2018-06-26 首钢京唐钢铁联合有限责任公司 Improve the load distribution method of hot rolled thin strip rolling stability
CN106269911B (en) * 2016-08-29 2018-10-23 首钢京唐钢铁联合有限责任公司 A kind of roughing pressure Control System of Load Distribution method and roughing control system
CN108971236A (en) * 2017-05-31 2018-12-11 宝山钢铁股份有限公司 A kind of draught pressure forecast method of hot continuous rolling composite strip
CN108856305B (en) * 2018-06-14 2020-07-07 武汉钢铁有限公司 Load distribution method for non-oriented silicon steel production rolling mill
CN109848221B (en) * 2018-12-21 2019-12-31 东北大学 Hot continuous rolling whole-process load distribution method
CN110947771B (en) * 2019-11-22 2020-12-01 东北大学 Method for calculating rolling energy consumption of hot continuous rolling
CN111906152B (en) * 2020-07-02 2022-03-18 九江萍钢钢铁有限公司 Finish rolling stage load adjustment method for controlling shape of medium plate
CN113145650A (en) * 2021-05-12 2021-07-23 南京钢铁股份有限公司 Wide and thick plate rolling mill load distribution method based on actual rolling case retrieval

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JP4962319B2 (en) * 2008-01-09 2012-06-27 Jfeスチール株式会社 Steel strip temper rolling method
CN101934290B (en) * 2009-06-30 2014-04-16 上海宝信软件股份有限公司 Load allocation adjusting method for stainless steel tandem cold rolling mill
KR101322084B1 (en) * 2010-12-27 2013-10-25 주식회사 포스코 Method for Load Distribution of rolling
CN102728624B (en) * 2011-04-13 2014-10-01 宝山钢铁股份有限公司 Method for setting load distribution of finish rolling band steel

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